diff --git a/Gemfile b/Gemfile
index 824bd52d16..e4321a1a36 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source "https://rubygems.org"
 
 gem "webrick", "~> 1.7"
-gem "jekyll", "~> 4.2"
+gem "jekyll", "~> 4.3"
 gem "jekyll-environment-variables"
\ No newline at end of file
diff --git a/_sass/bootstrap/_accordion.scss b/_sass/bootstrap/_accordion.scss
new file mode 100644
index 0000000000..75588a5adb
--- /dev/null
+++ b/_sass/bootstrap/_accordion.scss
@@ -0,0 +1,158 @@
+//
+// Base styles
+//
+
+.accordion {
+  // scss-docs-start accordion-css-vars
+  --#{$prefix}accordion-color: #{$accordion-color};
+  --#{$prefix}accordion-bg: #{$accordion-bg};
+  --#{$prefix}accordion-transition: #{$accordion-transition};
+  --#{$prefix}accordion-border-color: #{$accordion-border-color};
+  --#{$prefix}accordion-border-width: #{$accordion-border-width};
+  --#{$prefix}accordion-border-radius: #{$accordion-border-radius};
+  --#{$prefix}accordion-inner-border-radius: #{$accordion-inner-border-radius};
+  --#{$prefix}accordion-btn-padding-x: #{$accordion-button-padding-x};
+  --#{$prefix}accordion-btn-padding-y: #{$accordion-button-padding-y};
+  --#{$prefix}accordion-btn-color: #{$accordion-button-color};
+  --#{$prefix}accordion-btn-bg: #{$accordion-button-bg};
+  --#{$prefix}accordion-btn-icon: #{escape-svg($accordion-button-icon)};
+  --#{$prefix}accordion-btn-icon-width: #{$accordion-icon-width};
+  --#{$prefix}accordion-btn-icon-transform: #{$accordion-icon-transform};
+  --#{$prefix}accordion-btn-icon-transition: #{$accordion-icon-transition};
+  --#{$prefix}accordion-btn-active-icon: #{escape-svg($accordion-button-active-icon)};
+  --#{$prefix}accordion-btn-focus-border-color: #{$accordion-button-focus-border-color};
+  --#{$prefix}accordion-btn-focus-box-shadow: #{$accordion-button-focus-box-shadow};
+  --#{$prefix}accordion-body-padding-x: #{$accordion-body-padding-x};
+  --#{$prefix}accordion-body-padding-y: #{$accordion-body-padding-y};
+  --#{$prefix}accordion-active-color: #{$accordion-button-active-color};
+  --#{$prefix}accordion-active-bg: #{$accordion-button-active-bg};
+  // scss-docs-end accordion-css-vars
+}
+
+.accordion-button {
+  position: relative;
+  display: flex;
+  align-items: center;
+  width: 100%;
+  padding: var(--#{$prefix}accordion-btn-padding-y) var(--#{$prefix}accordion-btn-padding-x);
+  @include font-size($font-size-base);
+  color: var(--#{$prefix}accordion-btn-color);
+  text-align: left; // Reset button style
+  background-color: var(--#{$prefix}accordion-btn-bg);
+  border: 0;
+  @include border-radius(0);
+  overflow-anchor: none;
+  @include transition(var(--#{$prefix}accordion-transition));
+
+  &:not(.collapsed) {
+    color: var(--#{$prefix}accordion-active-color);
+    background-color: var(--#{$prefix}accordion-active-bg);
+    box-shadow: inset 0 calc(-1 * var(--#{$prefix}accordion-border-width)) 0 var(--#{$prefix}accordion-border-color); // stylelint-disable-line function-disallowed-list
+
+    &::after {
+      background-image: var(--#{$prefix}accordion-btn-active-icon);
+      transform: var(--#{$prefix}accordion-btn-icon-transform);
+    }
+  }
+
+  // Accordion icon
+  &::after {
+    flex-shrink: 0;
+    width: var(--#{$prefix}accordion-btn-icon-width);
+    height: var(--#{$prefix}accordion-btn-icon-width);
+    margin-left: auto;
+    content: "";
+    background-image: var(--#{$prefix}accordion-btn-icon);
+    background-repeat: no-repeat;
+    background-size: var(--#{$prefix}accordion-btn-icon-width);
+    @include transition(var(--#{$prefix}accordion-btn-icon-transition));
+  }
+
+  &:hover {
+    z-index: 2;
+  }
+
+  &:focus {
+    z-index: 3;
+    border-color: var(--#{$prefix}accordion-btn-focus-border-color);
+    outline: 0;
+    box-shadow: var(--#{$prefix}accordion-btn-focus-box-shadow);
+  }
+}
+
+.accordion-header {
+  margin-bottom: 0;
+}
+
+.accordion-item {
+  color: var(--#{$prefix}accordion-color);
+  background-color: var(--#{$prefix}accordion-bg);
+  border: var(--#{$prefix}accordion-border-width) solid var(--#{$prefix}accordion-border-color);
+
+  &:first-of-type {
+    @include border-top-radius(var(--#{$prefix}accordion-border-radius));
+
+    .accordion-button {
+      @include border-top-radius(var(--#{$prefix}accordion-inner-border-radius));
+    }
+  }
+
+  &:not(:first-of-type) {
+    border-top: 0;
+  }
+
+  // Only set a border-radius on the last item if the accordion is collapsed
+  &:last-of-type {
+    @include border-bottom-radius(var(--#{$prefix}accordion-border-radius));
+
+    .accordion-button {
+      &.collapsed {
+        @include border-bottom-radius(var(--#{$prefix}accordion-inner-border-radius));
+      }
+    }
+
+    .accordion-collapse {
+      @include border-bottom-radius(var(--#{$prefix}accordion-border-radius));
+    }
+  }
+}
+
+.accordion-body {
+  padding: var(--#{$prefix}accordion-body-padding-y) var(--#{$prefix}accordion-body-padding-x);
+}
+
+
+// Flush accordion items
+//
+// Remove borders and border-radius to keep accordion items edge-to-edge.
+
+.accordion-flush {
+  .accordion-collapse {
+    border-width: 0;
+  }
+
+  .accordion-item {
+    border-right: 0;
+    border-left: 0;
+    @include border-radius(0);
+
+    &:first-child { border-top: 0; }
+    &:last-child { border-bottom: 0; }
+
+    .accordion-button {
+      &,
+      &.collapsed {
+        @include border-radius(0);
+      }
+    }
+  }
+}
+
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .accordion-button::after {
+      --#{$prefix}accordion-btn-icon: #{escape-svg($accordion-button-icon-dark)};
+      --#{$prefix}accordion-btn-active-icon: #{escape-svg($accordion-button-active-icon-dark)};
+    }
+  }
+}
diff --git a/_sass/bootstrap/_alert.scss b/_sass/bootstrap/_alert.scss
index 4aa1fc2039..b8cff9b71e 100644
--- a/_sass/bootstrap/_alert.scss
+++ b/_sass/bootstrap/_alert.scss
@@ -3,11 +3,25 @@
 //
 
 .alert {
+  // scss-docs-start alert-css-vars
+  --#{$prefix}alert-bg: transparent;
+  --#{$prefix}alert-padding-x: #{$alert-padding-x};
+  --#{$prefix}alert-padding-y: #{$alert-padding-y};
+  --#{$prefix}alert-margin-bottom: #{$alert-margin-bottom};
+  --#{$prefix}alert-color: inherit;
+  --#{$prefix}alert-border-color: transparent;
+  --#{$prefix}alert-border: #{$alert-border-width} solid var(--#{$prefix}alert-border-color);
+  --#{$prefix}alert-border-radius: #{$alert-border-radius};
+  --#{$prefix}alert-link-color: inherit;
+  // scss-docs-end alert-css-vars
+
   position: relative;
-  padding: $alert-padding-y $alert-padding-x;
-  margin-bottom: $alert-margin-bottom;
-  border: $alert-border-width solid transparent;
-  @include border-radius($alert-border-radius);
+  padding: var(--#{$prefix}alert-padding-y) var(--#{$prefix}alert-padding-x);
+  margin-bottom: var(--#{$prefix}alert-margin-bottom);
+  color: var(--#{$prefix}alert-color);
+  background-color: var(--#{$prefix}alert-bg);
+  border: var(--#{$prefix}alert-border);
+  @include border-radius(var(--#{$prefix}alert-border-radius));
 }
 
 // Headings for larger alerts
@@ -19,6 +33,7 @@
 // Provide class for links that match alerts
 .alert-link {
   font-weight: $alert-link-font-weight;
+  color: var(--#{$prefix}alert-link-color);
 }
 
 
@@ -27,26 +42,27 @@
 // Expand the right padding and account for the close button's positioning.
 
 .alert-dismissible {
-  padding-right: $close-font-size + $alert-padding-x * 2;
+  padding-right: $alert-dismissible-padding-r;
 
   // Adjust close link position
-  .close {
+  .btn-close {
     position: absolute;
     top: 0;
     right: 0;
-    z-index: 2;
-    padding: $alert-padding-y $alert-padding-x;
-    color: inherit;
+    z-index: $stretched-link-z-index + 1;
+    padding: $alert-padding-y * 1.25 $alert-padding-x;
   }
 }
 
 
-// Alternate styles
-//
-// Generate contextual modifier classes for colorizing the alert.
-
-@each $color, $value in $theme-colors {
-  .alert-#{$color} {
-    @include alert-variant(theme-color-level($color, $alert-bg-level), theme-color-level($color, $alert-border-level), theme-color-level($color, $alert-color-level));
+// scss-docs-start alert-modifiers
+// Generate contextual modifier classes for colorizing the alert
+@each $state in map-keys($theme-colors) {
+  .alert-#{$state} {
+    --#{$prefix}alert-color: var(--#{$prefix}#{$state}-text-emphasis);
+    --#{$prefix}alert-bg: var(--#{$prefix}#{$state}-bg-subtle);
+    --#{$prefix}alert-border-color: var(--#{$prefix}#{$state}-border-subtle);
+    --#{$prefix}alert-link-color: var(--#{$prefix}#{$state}-text-emphasis);
   }
 }
+// scss-docs-end alert-modifiers
diff --git a/_sass/bootstrap/_badge.scss b/_sass/bootstrap/_badge.scss
index 42c5d08d74..cc3d269556 100644
--- a/_sass/bootstrap/_badge.scss
+++ b/_sass/bootstrap/_badge.scss
@@ -4,22 +4,26 @@
 // `background-color`.
 
 .badge {
+  // scss-docs-start badge-css-vars
+  --#{$prefix}badge-padding-x: #{$badge-padding-x};
+  --#{$prefix}badge-padding-y: #{$badge-padding-y};
+  @include rfs($badge-font-size, --#{$prefix}badge-font-size);
+  --#{$prefix}badge-font-weight: #{$badge-font-weight};
+  --#{$prefix}badge-color: #{$badge-color};
+  --#{$prefix}badge-border-radius: #{$badge-border-radius};
+  // scss-docs-end badge-css-vars
+
   display: inline-block;
-  padding: $badge-padding-y $badge-padding-x;
-  @include font-size($badge-font-size);
-  font-weight: $badge-font-weight;
+  padding: var(--#{$prefix}badge-padding-y) var(--#{$prefix}badge-padding-x);
+  @include font-size(var(--#{$prefix}badge-font-size));
+  font-weight: var(--#{$prefix}badge-font-weight);
   line-height: 1;
+  color: var(--#{$prefix}badge-color);
   text-align: center;
   white-space: nowrap;
   vertical-align: baseline;
-  @include border-radius($badge-border-radius);
-  @include transition($badge-transition);
-
-  @at-root a#{&} {
-    @include hover-focus() {
-      text-decoration: none;
-    }
-  }
+  @include border-radius(var(--#{$prefix}badge-border-radius));
+  @include gradient-bg();
 
   // Empty badges collapse automatically
   &:empty {
@@ -32,23 +36,3 @@
   position: relative;
   top: -1px;
 }
-
-// Pill badges
-//
-// Make them extra rounded with a modifier to replace v3's badges.
-
-.badge-pill {
-  padding-right: $badge-pill-padding-x;
-  padding-left: $badge-pill-padding-x;
-  @include border-radius($badge-pill-border-radius);
-}
-
-// Colors
-//
-// Contextual variations (linked badges get darker on :hover).
-
-@each $color, $value in $theme-colors {
-  .badge-#{$color} {
-    @include badge-variant($value);
-  }
-}
diff --git a/_sass/bootstrap/_breadcrumb.scss b/_sass/bootstrap/_breadcrumb.scss
index 9c204c7d55..b8252ff215 100644
--- a/_sass/bootstrap/_breadcrumb.scss
+++ b/_sass/bootstrap/_breadcrumb.scss
@@ -1,42 +1,40 @@
 .breadcrumb {
+  // scss-docs-start breadcrumb-css-vars
+  --#{$prefix}breadcrumb-padding-x: #{$breadcrumb-padding-x};
+  --#{$prefix}breadcrumb-padding-y: #{$breadcrumb-padding-y};
+  --#{$prefix}breadcrumb-margin-bottom: #{$breadcrumb-margin-bottom};
+  @include rfs($breadcrumb-font-size, --#{$prefix}breadcrumb-font-size);
+  --#{$prefix}breadcrumb-bg: #{$breadcrumb-bg};
+  --#{$prefix}breadcrumb-border-radius: #{$breadcrumb-border-radius};
+  --#{$prefix}breadcrumb-divider-color: #{$breadcrumb-divider-color};
+  --#{$prefix}breadcrumb-item-padding-x: #{$breadcrumb-item-padding-x};
+  --#{$prefix}breadcrumb-item-active-color: #{$breadcrumb-active-color};
+  // scss-docs-end breadcrumb-css-vars
+
   display: flex;
   flex-wrap: wrap;
-  padding: $breadcrumb-padding-y $breadcrumb-padding-x;
-  margin-bottom: $breadcrumb-margin-bottom;
-  @include font-size($breadcrumb-font-size);
+  padding: var(--#{$prefix}breadcrumb-padding-y) var(--#{$prefix}breadcrumb-padding-x);
+  margin-bottom: var(--#{$prefix}breadcrumb-margin-bottom);
+  @include font-size(var(--#{$prefix}breadcrumb-font-size));
   list-style: none;
-  background-color: $breadcrumb-bg;
-  @include border-radius($breadcrumb-border-radius);
+  background-color: var(--#{$prefix}breadcrumb-bg);
+  @include border-radius(var(--#{$prefix}breadcrumb-border-radius));
 }
 
 .breadcrumb-item {
   // The separator between breadcrumbs (by default, a forward-slash: "/")
   + .breadcrumb-item {
-    padding-left: $breadcrumb-item-padding;
+    padding-left: var(--#{$prefix}breadcrumb-item-padding-x);
 
     &::before {
       float: left; // Suppress inline spacings and underlining of the separator
-      padding-right: $breadcrumb-item-padding;
-      color: $breadcrumb-divider-color;
-      content: escape-svg($breadcrumb-divider);
+      padding-right: var(--#{$prefix}breadcrumb-item-padding-x);
+      color: var(--#{$prefix}breadcrumb-divider-color);
+      content: var(--#{$prefix}breadcrumb-divider, escape-svg($breadcrumb-divider)) #{"/* rtl:"} var(--#{$prefix}breadcrumb-divider, escape-svg($breadcrumb-divider-flipped)) #{"*/"};
     }
   }
 
-  // IE9-11 hack to properly handle hyperlink underlines for breadcrumbs built
-  // without `<ul>`s. The `::before` pseudo-element generates an element
-  // *within* the .breadcrumb-item and thereby inherits the `text-decoration`.
-  //
-  // To trick IE into suppressing the underline, we give the pseudo-element an
-  // underline and then immediately remove it.
-  + .breadcrumb-item:hover::before {
-    text-decoration: underline;
-  }
-  // stylelint-disable-next-line no-duplicate-selectors
-  + .breadcrumb-item:hover::before {
-    text-decoration: none;
-  }
-
   &.active {
-    color: $breadcrumb-active-color;
+    color: var(--#{$prefix}breadcrumb-item-active-color);
   }
 }
diff --git a/_sass/bootstrap/_button-group.scss b/_sass/bootstrap/_button-group.scss
index da02d7931b..55ae3f65d2 100644
--- a/_sass/bootstrap/_button-group.scss
+++ b/_sass/bootstrap/_button-group.scss
@@ -1,5 +1,3 @@
-// stylelint-disable selector-no-qualifying-type
-
 // Make the div behave like a button
 .btn-group,
 .btn-group-vertical {
@@ -10,17 +8,17 @@
   > .btn {
     position: relative;
     flex: 1 1 auto;
+  }
 
-    // Bring the hover, focused, and "active" buttons to the front to overlay
-    // the borders properly
-    @include hover() {
-      z-index: 1;
-    }
-    &:focus,
-    &:active,
-    &.active {
-      z-index: 1;
-    }
+  // Bring the hover, focused, and "active" buttons to the front to overlay
+  // the borders properly
+  > .btn-check:checked + .btn,
+  > .btn-check:focus + .btn,
+  > .btn:hover,
+  > .btn:focus,
+  > .btn:active,
+  > .btn.active {
+    z-index: 1;
   }
 }
 
@@ -36,21 +34,29 @@
 }
 
 .btn-group {
+  @include border-radius($btn-border-radius);
+
   // Prevent double borders when buttons are next to each other
-  > .btn:not(:first-child),
+  > :not(.btn-check:first-child) + .btn,
   > .btn-group:not(:first-child) {
-    margin-left: -$btn-border-width;
+    margin-left: calc(#{$btn-border-width} * -1); // stylelint-disable-line function-disallowed-list
   }
 
   // Reset rounded corners
   > .btn:not(:last-child):not(.dropdown-toggle),
+  > .btn.dropdown-toggle-split:first-child,
   > .btn-group:not(:last-child) > .btn {
-    @include border-right-radius(0);
+    @include border-end-radius(0);
   }
 
-  > .btn:not(:first-child),
+  // The left radius should be 0 if the button is:
+  // - the "third or more" child
+  // - the second child and the previous element isn't `.btn-check` (making it the first child visually)
+  // - part of a btn-group which isn't the first child
+  > .btn:nth-child(n + 3),
+  > :not(.btn-check) + .btn,
   > .btn-group:not(:first-child) > .btn {
-    @include border-left-radius(0);
+    @include border-start-radius(0);
   }
 }
 
@@ -72,11 +78,11 @@
 
   &::after,
   .dropup &::after,
-  .dropright &::after {
+  .dropend &::after {
     margin-left: 0;
   }
 
-  .dropleft &::before {
+  .dropstart &::before {
     margin-right: 0;
   }
 }
@@ -120,7 +126,7 @@
 
   > .btn:not(:first-child),
   > .btn-group:not(:first-child) {
-    margin-top: -$btn-border-width;
+    margin-top: calc(#{$btn-border-width} * -1); // stylelint-disable-line function-disallowed-list
   }
 
   // Reset rounded corners
@@ -129,35 +135,8 @@
     @include border-bottom-radius(0);
   }
 
-  > .btn:not(:first-child),
+  > .btn ~ .btn,
   > .btn-group:not(:first-child) > .btn {
     @include border-top-radius(0);
   }
 }
-
-
-// Checkbox and radio options
-//
-// In order to support the browser's form validation feedback, powered by the
-// `required` attribute, we have to "hide" the inputs via `clip`. We cannot use
-// `display: none;` or `visibility: hidden;` as that also hides the popover.
-// Simply visually hiding the inputs via `opacity` would leave them clickable in
-// certain cases which is prevented by using `clip` and `pointer-events`.
-// This way, we ensure a DOM element is visible to position the popover from.
-//
-// See https://github.com/twbs/bootstrap/pull/12794 and
-// https://github.com/twbs/bootstrap/pull/14559 for more information.
-
-.btn-group-toggle {
-  > .btn,
-  > .btn-group > .btn {
-    margin-bottom: 0; // Override default `<label>` value
-
-    input[type="radio"],
-    input[type="checkbox"] {
-      position: absolute;
-      clip: rect(0, 0, 0, 0);
-      pointer-events: none;
-    }
-  }
-}
diff --git a/_sass/bootstrap/_buttons.scss b/_sass/bootstrap/_buttons.scss
index 6ee24ba1fc..e14a184384 100644
--- a/_sass/bootstrap/_buttons.scss
+++ b/_sass/bootstrap/_buttons.scss
@@ -1,60 +1,116 @@
-// stylelint-disable selector-no-qualifying-type
-
 //
 // Base styles
 //
 
 .btn {
+  // scss-docs-start btn-css-vars
+  --#{$prefix}btn-padding-x: #{$btn-padding-x};
+  --#{$prefix}btn-padding-y: #{$btn-padding-y};
+  --#{$prefix}btn-font-family: #{$btn-font-family};
+  @include rfs($btn-font-size, --#{$prefix}btn-font-size);
+  --#{$prefix}btn-font-weight: #{$btn-font-weight};
+  --#{$prefix}btn-line-height: #{$btn-line-height};
+  --#{$prefix}btn-color: #{$btn-color};
+  --#{$prefix}btn-bg: transparent;
+  --#{$prefix}btn-border-width: #{$btn-border-width};
+  --#{$prefix}btn-border-color: transparent;
+  --#{$prefix}btn-border-radius: #{$btn-border-radius};
+  --#{$prefix}btn-hover-border-color: transparent;
+  --#{$prefix}btn-box-shadow: #{$btn-box-shadow};
+  --#{$prefix}btn-disabled-opacity: #{$btn-disabled-opacity};
+  --#{$prefix}btn-focus-box-shadow: 0 0 0 #{$btn-focus-width} rgba(var(--#{$prefix}btn-focus-shadow-rgb), .5);
+  // scss-docs-end btn-css-vars
+
   display: inline-block;
-  font-family: $btn-font-family;
-  font-weight: $btn-font-weight;
-  color: $body-color;
+  padding: var(--#{$prefix}btn-padding-y) var(--#{$prefix}btn-padding-x);
+  font-family: var(--#{$prefix}btn-font-family);
+  @include font-size(var(--#{$prefix}btn-font-size));
+  font-weight: var(--#{$prefix}btn-font-weight);
+  line-height: var(--#{$prefix}btn-line-height);
+  color: var(--#{$prefix}btn-color);
   text-align: center;
   text-decoration: if($link-decoration == none, null, none);
   white-space: $btn-white-space;
   vertical-align: middle;
+  cursor: if($enable-button-pointers, pointer, null);
   user-select: none;
-  background-color: transparent;
-  border: $btn-border-width solid transparent;
-  @include button-size($btn-padding-y, $btn-padding-x, $btn-font-size, $btn-line-height, $btn-border-radius);
+  border: var(--#{$prefix}btn-border-width) solid var(--#{$prefix}btn-border-color);
+  @include border-radius(var(--#{$prefix}btn-border-radius));
+  @include gradient-bg(var(--#{$prefix}btn-bg));
+  @include box-shadow(var(--#{$prefix}btn-box-shadow));
   @include transition($btn-transition);
 
-  @include hover() {
-    color: $body-color;
-    text-decoration: none;
+  &:hover {
+    color: var(--#{$prefix}btn-hover-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
+    background-color: var(--#{$prefix}btn-hover-bg);
+    border-color: var(--#{$prefix}btn-hover-border-color);
   }
 
-  &:focus,
-  &.focus {
-    outline: 0;
-    box-shadow: $btn-focus-box-shadow;
+  .btn-check + &:hover {
+    // override for the checkbox/radio buttons
+    color: var(--#{$prefix}btn-color);
+    background-color: var(--#{$prefix}btn-bg);
+    border-color: var(--#{$prefix}btn-border-color);
   }
 
-  // Disabled comes first so active can properly restyle
-  &.disabled,
-  &:disabled {
-    opacity: $btn-disabled-opacity;
-    @include box-shadow(none);
+  &:focus-visible {
+    color: var(--#{$prefix}btn-hover-color);
+    @include gradient-bg(var(--#{$prefix}btn-hover-bg));
+    border-color: var(--#{$prefix}btn-hover-border-color);
+    outline: 0;
+    // Avoid using mixin so we can pass custom focus shadow properly
+    @if $enable-shadows {
+      box-shadow: var(--#{$prefix}btn-box-shadow), var(--#{$prefix}btn-focus-box-shadow);
+    } @else {
+      box-shadow: var(--#{$prefix}btn-focus-box-shadow);
+    }
   }
 
-  &:not(:disabled):not(.disabled) {
-    cursor: if($enable-pointer-cursor-for-buttons, pointer, null);
-
-    &:active,
-    &.active {
-      @include box-shadow($btn-active-box-shadow);
+  .btn-check:focus-visible + & {
+    border-color: var(--#{$prefix}btn-hover-border-color);
+    outline: 0;
+    // Avoid using mixin so we can pass custom focus shadow properly
+    @if $enable-shadows {
+      box-shadow: var(--#{$prefix}btn-box-shadow), var(--#{$prefix}btn-focus-box-shadow);
+    } @else {
+      box-shadow: var(--#{$prefix}btn-focus-box-shadow);
+    }
+  }
 
-      &:focus {
-        @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+  .btn-check:checked + &,
+  :not(.btn-check) + &:active,
+  &:first-child:active,
+  &.active,
+  &.show {
+    color: var(--#{$prefix}btn-active-color);
+    background-color: var(--#{$prefix}btn-active-bg);
+    // Remove CSS gradients if they're enabled
+    background-image: if($enable-gradients, none, null);
+    border-color: var(--#{$prefix}btn-active-border-color);
+    @include box-shadow(var(--#{$prefix}btn-active-shadow));
+
+    &:focus-visible {
+      // Avoid using mixin so we can pass custom focus shadow properly
+      @if $enable-shadows {
+        box-shadow: var(--#{$prefix}btn-active-shadow), var(--#{$prefix}btn-focus-box-shadow);
+      } @else {
+        box-shadow: var(--#{$prefix}btn-focus-box-shadow);
       }
     }
   }
-}
 
-// Future-proof disabling of clicks on `<a>` elements
-a.btn.disabled,
-fieldset:disabled a.btn {
-  pointer-events: none;
+  &:disabled,
+  &.disabled,
+  fieldset:disabled & {
+    color: var(--#{$prefix}btn-disabled-color);
+    pointer-events: none;
+    background-color: var(--#{$prefix}btn-disabled-bg);
+    background-image: if($enable-gradients, none, null);
+    border-color: var(--#{$prefix}btn-disabled-border-color);
+    opacity: var(--#{$prefix}btn-disabled-opacity);
+    @include box-shadow(none);
+  }
 }
 
 
@@ -62,9 +118,30 @@ fieldset:disabled a.btn {
 // Alternate buttons
 //
 
+// scss-docs-start btn-variant-loops
 @each $color, $value in $theme-colors {
   .btn-#{$color} {
-    @include button-variant($value, $value);
+    @if $color == "light" {
+      @include button-variant(
+        $value,
+        $value,
+        $hover-background: shade-color($value, $btn-hover-bg-shade-amount),
+        $hover-border: shade-color($value, $btn-hover-border-shade-amount),
+        $active-background: shade-color($value, $btn-active-bg-shade-amount),
+        $active-border: shade-color($value, $btn-active-border-shade-amount)
+      );
+    } @else if $color == "dark" {
+      @include button-variant(
+        $value,
+        $value,
+        $hover-background: tint-color($value, $btn-hover-bg-tint-amount),
+        $hover-border: tint-color($value, $btn-hover-border-tint-amount),
+        $active-background: tint-color($value, $btn-active-bg-tint-amount),
+        $active-border: tint-color($value, $btn-active-border-tint-amount)
+      );
+    } @else {
+      @include button-variant($value, $value);
+    }
   }
 }
 
@@ -73,6 +150,7 @@ fieldset:disabled a.btn {
     @include button-outline-variant($value);
   }
 }
+// scss-docs-end btn-variant-loops
 
 
 //
@@ -81,24 +159,35 @@ fieldset:disabled a.btn {
 
 // Make a button look and behave like a link
 .btn-link {
-  font-weight: $font-weight-normal;
-  color: $link-color;
+  --#{$prefix}btn-font-weight: #{$font-weight-normal};
+  --#{$prefix}btn-color: #{$btn-link-color};
+  --#{$prefix}btn-bg: transparent;
+  --#{$prefix}btn-border-color: transparent;
+  --#{$prefix}btn-hover-color: #{$btn-link-hover-color};
+  --#{$prefix}btn-hover-border-color: transparent;
+  --#{$prefix}btn-active-color: #{$btn-link-hover-color};
+  --#{$prefix}btn-active-border-color: transparent;
+  --#{$prefix}btn-disabled-color: #{$btn-link-disabled-color};
+  --#{$prefix}btn-disabled-border-color: transparent;
+  --#{$prefix}btn-box-shadow: 0 0 0 #000; // Can't use `none` as keyword negates all values when used with multiple shadows
+  --#{$prefix}btn-focus-shadow-rgb: #{$btn-link-focus-shadow-rgb};
+
   text-decoration: $link-decoration;
+  @if $enable-gradients {
+    background-image: none;
+  }
 
-  @include hover() {
-    color: $link-hover-color;
+  &:hover,
+  &:focus-visible {
     text-decoration: $link-hover-decoration;
   }
 
-  &:focus,
-  &.focus {
-    text-decoration: $link-hover-decoration;
+  &:focus-visible {
+    color: var(--#{$prefix}btn-color);
   }
 
-  &:disabled,
-  &.disabled {
-    color: $btn-link-disabled-color;
-    pointer-events: none;
+  &:hover {
+    color: var(--#{$prefix}btn-hover-color);
   }
 
   // No need for an active state here
@@ -110,33 +199,9 @@ fieldset:disabled a.btn {
 //
 
 .btn-lg {
-  @include button-size($btn-padding-y-lg, $btn-padding-x-lg, $btn-font-size-lg, $btn-line-height-lg, $btn-border-radius-lg);
+  @include button-size($btn-padding-y-lg, $btn-padding-x-lg, $btn-font-size-lg, $btn-border-radius-lg);
 }
 
 .btn-sm {
-  @include button-size($btn-padding-y-sm, $btn-padding-x-sm, $btn-font-size-sm, $btn-line-height-sm, $btn-border-radius-sm);
-}
-
-
-//
-// Block button
-//
-
-.btn-block {
-  display: block;
-  width: 100%;
-
-  // Vertically space out multiple block buttons
-  + .btn-block {
-    margin-top: $btn-block-spacing-y;
-  }
-}
-
-// Specificity overrides
-input[type="submit"],
-input[type="reset"],
-input[type="button"] {
-  &.btn-block {
-    width: 100%;
-  }
+  @include button-size($btn-padding-y-sm, $btn-padding-x-sm, $btn-font-size-sm, $btn-border-radius-sm);
 }
diff --git a/_sass/bootstrap/_card.scss b/_sass/bootstrap/_card.scss
index faaa75ef7f..d3535a98b7 100644
--- a/_sass/bootstrap/_card.scss
+++ b/_sass/bootstrap/_card.scss
@@ -3,16 +3,40 @@
 //
 
 .card {
+  // scss-docs-start card-css-vars
+  --#{$prefix}card-spacer-y: #{$card-spacer-y};
+  --#{$prefix}card-spacer-x: #{$card-spacer-x};
+  --#{$prefix}card-title-spacer-y: #{$card-title-spacer-y};
+  --#{$prefix}card-title-color: #{$card-title-color};
+  --#{$prefix}card-subtitle-color: #{$card-subtitle-color};
+  --#{$prefix}card-border-width: #{$card-border-width};
+  --#{$prefix}card-border-color: #{$card-border-color};
+  --#{$prefix}card-border-radius: #{$card-border-radius};
+  --#{$prefix}card-box-shadow: #{$card-box-shadow};
+  --#{$prefix}card-inner-border-radius: #{$card-inner-border-radius};
+  --#{$prefix}card-cap-padding-y: #{$card-cap-padding-y};
+  --#{$prefix}card-cap-padding-x: #{$card-cap-padding-x};
+  --#{$prefix}card-cap-bg: #{$card-cap-bg};
+  --#{$prefix}card-cap-color: #{$card-cap-color};
+  --#{$prefix}card-height: #{$card-height};
+  --#{$prefix}card-color: #{$card-color};
+  --#{$prefix}card-bg: #{$card-bg};
+  --#{$prefix}card-img-overlay-padding: #{$card-img-overlay-padding};
+  --#{$prefix}card-group-margin: #{$card-group-margin};
+  // scss-docs-end card-css-vars
+
   position: relative;
   display: flex;
   flex-direction: column;
   min-width: 0; // See https://github.com/twbs/bootstrap/pull/22740#issuecomment-305868106
-  height: $card-height;
+  height: var(--#{$prefix}card-height);
+  color: var(--#{$prefix}body-color);
   word-wrap: break-word;
-  background-color: $card-bg;
+  background-color: var(--#{$prefix}card-bg);
   background-clip: border-box;
-  border: $card-border-width solid $card-border-color;
-  @include border-radius($card-border-radius);
+  border: var(--#{$prefix}card-border-width) solid var(--#{$prefix}card-border-color);
+  @include border-radius(var(--#{$prefix}card-border-radius));
+  @include box-shadow(var(--#{$prefix}card-box-shadow));
 
   > hr {
     margin-right: 0;
@@ -25,12 +49,12 @@
 
     &:first-child {
       border-top-width: 0;
-      @include border-top-radius($card-inner-border-radius);
+      @include border-top-radius(var(--#{$prefix}card-inner-border-radius));
     }
 
     &:last-child  {
       border-bottom-width: 0;
-      @include border-bottom-radius($card-inner-border-radius);
+      @include border-bottom-radius(var(--#{$prefix}card-inner-border-radius));
     }
   }
 
@@ -46,20 +70,19 @@
   // Enable `flex-grow: 1` for decks and groups so that card blocks take up
   // as much space as possible, ensuring footers are aligned to the bottom.
   flex: 1 1 auto;
-  // Workaround for the image size bug in IE
-  // See: https://github.com/twbs/bootstrap/pull/28855
-  min-height: 1px;
-  padding: $card-spacer-x;
-  color: $card-color;
+  padding: var(--#{$prefix}card-spacer-y) var(--#{$prefix}card-spacer-x);
+  color: var(--#{$prefix}card-color);
 }
 
 .card-title {
-  margin-bottom: $card-spacer-y;
+  margin-bottom: var(--#{$prefix}card-title-spacer-y);
+  color: var(--#{$prefix}card-title-color);
 }
 
 .card-subtitle {
-  margin-top: -$card-spacer-y / 2;
+  margin-top: calc(-.5 * var(--#{$prefix}card-title-spacer-y)); // stylelint-disable-line function-disallowed-list
   margin-bottom: 0;
+  color: var(--#{$prefix}card-subtitle-color);
 }
 
 .card-text:last-child {
@@ -67,12 +90,12 @@
 }
 
 .card-link {
-  @include hover() {
-    text-decoration: none;
+  &:hover {
+    text-decoration: if($link-hover-decoration == underline, none, null);
   }
 
   + .card-link {
-    margin-left: $card-spacer-x;
+    margin-left: var(--#{$prefix}card-spacer-x);
   }
 }
 
@@ -81,25 +104,25 @@
 //
 
 .card-header {
-  padding: $card-spacer-y $card-spacer-x;
+  padding: var(--#{$prefix}card-cap-padding-y) var(--#{$prefix}card-cap-padding-x);
   margin-bottom: 0; // Removes the default margin-bottom of <hN>
-  color: $card-cap-color;
-  background-color: $card-cap-bg;
-  border-bottom: $card-border-width solid $card-border-color;
+  color: var(--#{$prefix}card-cap-color);
+  background-color: var(--#{$prefix}card-cap-bg);
+  border-bottom: var(--#{$prefix}card-border-width) solid var(--#{$prefix}card-border-color);
 
   &:first-child {
-    @include border-radius($card-inner-border-radius $card-inner-border-radius 0 0);
+    @include border-radius(var(--#{$prefix}card-inner-border-radius) var(--#{$prefix}card-inner-border-radius) 0 0);
   }
 }
 
 .card-footer {
-  padding: $card-spacer-y $card-spacer-x;
-  color: $card-cap-color;
-  background-color: $card-cap-bg;
-  border-top: $card-border-width solid $card-border-color;
+  padding: var(--#{$prefix}card-cap-padding-y) var(--#{$prefix}card-cap-padding-x);
+  color: var(--#{$prefix}card-cap-color);
+  background-color: var(--#{$prefix}card-cap-bg);
+  border-top: var(--#{$prefix}card-border-width) solid var(--#{$prefix}card-border-color);
 
   &:last-child {
-    @include border-radius(0 0 $card-inner-border-radius $card-inner-border-radius);
+    @include border-radius(0 0 var(--#{$prefix}card-inner-border-radius) var(--#{$prefix}card-inner-border-radius));
   }
 }
 
@@ -109,15 +132,20 @@
 //
 
 .card-header-tabs {
-  margin-right: -$card-spacer-x / 2;
-  margin-bottom: -$card-spacer-y;
-  margin-left: -$card-spacer-x / 2;
+  margin-right: calc(-.5 * var(--#{$prefix}card-cap-padding-x)); // stylelint-disable-line function-disallowed-list
+  margin-bottom: calc(-1 * var(--#{$prefix}card-cap-padding-y)); // stylelint-disable-line function-disallowed-list
+  margin-left: calc(-.5 * var(--#{$prefix}card-cap-padding-x)); // stylelint-disable-line function-disallowed-list
   border-bottom: 0;
+
+  .nav-link.active {
+    background-color: var(--#{$prefix}card-bg);
+    border-bottom-color: var(--#{$prefix}card-bg);
+  }
 }
 
 .card-header-pills {
-  margin-right: -$card-spacer-x / 2;
-  margin-left: -$card-spacer-x / 2;
+  margin-right: calc(-.5 * var(--#{$prefix}card-cap-padding-x)); // stylelint-disable-line function-disallowed-list
+  margin-left: calc(-.5 * var(--#{$prefix}card-cap-padding-x)); // stylelint-disable-line function-disallowed-list
 }
 
 // Card image
@@ -127,49 +155,24 @@
   right: 0;
   bottom: 0;
   left: 0;
-  padding: $card-img-overlay-padding;
-  @include border-radius($card-inner-border-radius);
+  padding: var(--#{$prefix}card-img-overlay-padding);
+  @include border-radius(var(--#{$prefix}card-inner-border-radius));
 }
 
 .card-img,
 .card-img-top,
 .card-img-bottom {
-  flex-shrink: 0; // For IE: https://github.com/twbs/bootstrap/issues/29396
   width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
 }
 
 .card-img,
 .card-img-top {
-  @include border-top-radius($card-inner-border-radius);
+  @include border-top-radius(var(--#{$prefix}card-inner-border-radius));
 }
 
 .card-img,
 .card-img-bottom {
-  @include border-bottom-radius($card-inner-border-radius);
-}
-
-
-// Card deck
-
-.card-deck {
-  .card {
-    margin-bottom: $card-deck-margin;
-  }
-
-  @include media-breakpoint-up(sm) {
-    display: flex;
-    flex-flow: row wrap;
-    margin-right: -$card-deck-margin;
-    margin-left: -$card-deck-margin;
-
-    .card {
-      // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
-      flex: 1 0 0%;
-      margin-right: $card-deck-margin;
-      margin-bottom: 0; // Override the default
-      margin-left: $card-deck-margin;
-    }
-  }
+  @include border-bottom-radius(var(--#{$prefix}card-inner-border-radius));
 }
 
 
@@ -181,7 +184,7 @@
   // The child selector allows nested `.card` within `.card-group`
   // to display properly.
   > .card {
-    margin-bottom: $card-group-margin;
+    margin-bottom: var(--#{$prefix}card-group-margin);
   }
 
   @include media-breakpoint-up(sm) {
@@ -202,7 +205,7 @@
       // Handle rounded corners
       @if $enable-rounded {
         &:not(:last-child) {
-          @include border-right-radius(0);
+          @include border-end-radius(0);
 
           .card-img-top,
           .card-header {
@@ -217,7 +220,7 @@
         }
 
         &:not(:first-child) {
-          @include border-left-radius(0);
+          @include border-start-radius(0);
 
           .card-img-top,
           .card-header {
@@ -234,53 +237,3 @@
     }
   }
 }
-
-
-//
-// Columns
-//
-
-.card-columns {
-  .card {
-    margin-bottom: $card-columns-margin;
-  }
-
-  @include media-breakpoint-up(sm) {
-    column-count: $card-columns-count;
-    column-gap: $card-columns-gap;
-    orphans: 1;
-    widows: 1;
-
-    .card {
-      display: inline-block; // Don't let them vertically span multiple columns
-      width: 100%; // Don't let their width change
-    }
-  }
-}
-
-
-//
-// Accordion
-//
-
-.accordion {
-  overflow-anchor: none;
-
-  > .card {
-    overflow: hidden;
-
-    &:not(:last-of-type) {
-      border-bottom: 0;
-      @include border-bottom-radius(0);
-    }
-
-    &:not(:first-of-type) {
-      @include border-top-radius(0);
-    }
-
-    > .card-header {
-      @include border-radius(0);
-      margin-bottom: -$card-border-width;
-    }
-  }
-}
diff --git a/_sass/bootstrap/_carousel.scss b/_sass/bootstrap/_carousel.scss
index db30bed8b9..0ac8f8714f 100644
--- a/_sass/bootstrap/_carousel.scss
+++ b/_sass/bootstrap/_carousel.scss
@@ -3,12 +3,12 @@
 // 1. .carousel.pointer-event should ideally be pan-y (to allow for users to scroll vertically)
 //    even when their scroll action started on a carousel, but for compatibility (with Firefox)
 //    we're preventing all actions instead
-// 2. The .carousel-item-left and .carousel-item-right is used to indicate where
+// 2. The .carousel-item-start and .carousel-item-end is used to indicate where
 //    the active slide is heading.
 // 3. .active.carousel-item is the current slide.
-// 4. .active.carousel-item-left and .active.carousel-item-right is the current
+// 4. .active.carousel-item-start and .active.carousel-item-end is the current
 //    slide in its in-transition state. Only one of these occurs at a time.
-// 5. .carousel-item-next.carousel-item-left and .carousel-item-prev.carousel-item-right
+// 5. .carousel-item-next.carousel-item-start and .carousel-item-prev.carousel-item-end
 //    is the upcoming slide in transition.
 
 .carousel {
@@ -42,13 +42,13 @@
   display: block;
 }
 
-.carousel-item-next:not(.carousel-item-left),
-.active.carousel-item-right {
+.carousel-item-next:not(.carousel-item-start),
+.active.carousel-item-end {
   transform: translateX(100%);
 }
 
-.carousel-item-prev:not(.carousel-item-right),
-.active.carousel-item-left {
+.carousel-item-prev:not(.carousel-item-end),
+.active.carousel-item-start {
   transform: translateX(-100%);
 }
 
@@ -65,14 +65,14 @@
   }
 
   .carousel-item.active,
-  .carousel-item-next.carousel-item-left,
-  .carousel-item-prev.carousel-item-right {
+  .carousel-item-next.carousel-item-start,
+  .carousel-item-prev.carousel-item-end {
     z-index: 1;
     opacity: 1;
   }
 
-  .active.carousel-item-left,
-  .active.carousel-item-right {
+  .active.carousel-item-start,
+  .active.carousel-item-end {
     z-index: 0;
     opacity: 0;
     @include transition(opacity 0s $carousel-transition-duration);
@@ -95,13 +95,17 @@
   align-items: center; // 2. vertically center contents
   justify-content: center; // 3. horizontally center contents
   width: $carousel-control-width;
+  padding: 0;
   color: $carousel-control-color;
   text-align: center;
+  background: none;
+  border: 0;
   opacity: $carousel-control-opacity;
   @include transition($carousel-control-transition);
 
   // Hover/focus state
-  @include hover-focus() {
+  &:hover,
+  &:focus {
     color: $carousel-control-color;
     text-decoration: none;
     outline: 0;
@@ -110,15 +114,11 @@
 }
 .carousel-control-prev {
   left: 0;
-  @if $enable-gradients {
-    background-image: linear-gradient(90deg, rgba($black, .25), rgba($black, .001));
-  }
+  background-image: if($enable-gradients, linear-gradient(90deg, rgba($black, .25), rgba($black, .001)), null);
 }
 .carousel-control-next {
   right: 0;
-  @if $enable-gradients {
-    background-image: linear-gradient(270deg, rgba($black, .25), rgba($black, .001));
-  }
+  background-image: if($enable-gradients, linear-gradient(270deg, rgba($black, .25), rgba($black, .001)), null);
 }
 
 // Icons for within
@@ -127,8 +127,19 @@
   display: inline-block;
   width: $carousel-control-icon-width;
   height: $carousel-control-icon-width;
-  background: 50% / 100% 100% no-repeat;
-}
+  background-repeat: no-repeat;
+  background-position: 50%;
+  background-size: 100% 100%;
+}
+
+/* rtl:options: {
+  "autoRename": true,
+  "stringMap":[ {
+    "name"    : "prev-next",
+    "search"  : "prev",
+    "replace" : "next"
+  } ]
+} */
 .carousel-control-prev-icon {
   background-image: escape-svg($carousel-control-prev-icon-bg);
 }
@@ -136,46 +147,47 @@
   background-image: escape-svg($carousel-control-next-icon-bg);
 }
 
-
-// Optional indicator pips
+// Optional indicator pips/controls
 //
-// Add an ordered list with the following class and add a list item for each
-// slide your carousel holds.
+// Add a container (such as a list) with the following class and add an item (ideally a focusable control,
+// like a button) with data-bs-target for each slide your carousel holds.
 
 .carousel-indicators {
   position: absolute;
   right: 0;
   bottom: 0;
   left: 0;
-  z-index: 15;
+  z-index: 2;
   display: flex;
   justify-content: center;
-  padding-left: 0; // override <ol> default
+  padding: 0;
   // Use the .carousel-control's width as margin so we don't overlay those
   margin-right: $carousel-control-width;
+  margin-bottom: 1rem;
   margin-left: $carousel-control-width;
-  list-style: none;
 
-  li {
+  [data-bs-target] {
     box-sizing: content-box;
     flex: 0 1 auto;
     width: $carousel-indicator-width;
     height: $carousel-indicator-height;
+    padding: 0;
     margin-right: $carousel-indicator-spacer;
     margin-left: $carousel-indicator-spacer;
     text-indent: -999px;
     cursor: pointer;
     background-color: $carousel-indicator-active-bg;
     background-clip: padding-box;
+    border: 0;
     // Use transparent borders to increase the hit area by 10px on top and bottom.
     border-top: $carousel-indicator-hit-area-height solid transparent;
     border-bottom: $carousel-indicator-hit-area-height solid transparent;
-    opacity: .5;
+    opacity: $carousel-indicator-opacity;
     @include transition($carousel-indicator-transition);
   }
 
   .active {
-    opacity: 1;
+    opacity: $carousel-indicator-active-opacity;
   }
 }
 
@@ -186,12 +198,47 @@
 
 .carousel-caption {
   position: absolute;
-  right: (100% - $carousel-caption-width) / 2;
-  bottom: 20px;
-  left: (100% - $carousel-caption-width) / 2;
-  z-index: 10;
-  padding-top: 20px;
-  padding-bottom: 20px;
+  right: (100% - $carousel-caption-width) * .5;
+  bottom: $carousel-caption-spacer;
+  left: (100% - $carousel-caption-width) * .5;
+  padding-top: $carousel-caption-padding-y;
+  padding-bottom: $carousel-caption-padding-y;
   color: $carousel-caption-color;
   text-align: center;
 }
+
+// Dark mode carousel
+
+@mixin carousel-dark() {
+  .carousel-control-prev-icon,
+  .carousel-control-next-icon {
+    filter: $carousel-dark-control-icon-filter;
+  }
+
+  .carousel-indicators [data-bs-target] {
+    background-color: $carousel-dark-indicator-active-bg;
+  }
+
+  .carousel-caption {
+    color: $carousel-dark-caption-color;
+  }
+}
+
+.carousel-dark {
+  @include carousel-dark();
+}
+
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    @if $color-mode-type == "media-query" {
+      .carousel {
+        @include carousel-dark();
+      }
+    } @else {
+      .carousel,
+      &.carousel {
+        @include carousel-dark();
+      }
+    }
+  }
+}
diff --git a/_sass/bootstrap/_close.scss b/_sass/bootstrap/_close.scss
index 82e9593ef1..4d6e73c139 100644
--- a/_sass/bootstrap/_close.scss
+++ b/_sass/bootstrap/_close.scss
@@ -1,40 +1,63 @@
-.close {
-  float: right;
-  @include font-size($close-font-size);
-  font-weight: $close-font-weight;
-  line-height: 1;
-  color: $close-color;
-  text-shadow: $close-text-shadow;
-  opacity: .5;
+// Transparent background and border properties included for button version.
+// iOS requires the button element instead of an anchor tag.
+// If you want the anchor version, it requires `href="#"`.
+// See https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
+
+.btn-close {
+  // scss-docs-start close-css-vars
+  --#{$prefix}btn-close-color: #{$btn-close-color};
+  --#{$prefix}btn-close-bg: #{ escape-svg($btn-close-bg) };
+  --#{$prefix}btn-close-opacity: #{$btn-close-opacity};
+  --#{$prefix}btn-close-hover-opacity: #{$btn-close-hover-opacity};
+  --#{$prefix}btn-close-focus-shadow: #{$btn-close-focus-shadow};
+  --#{$prefix}btn-close-focus-opacity: #{$btn-close-focus-opacity};
+  --#{$prefix}btn-close-disabled-opacity: #{$btn-close-disabled-opacity};
+  --#{$prefix}btn-close-white-filter: #{$btn-close-white-filter};
+  // scss-docs-end close-css-vars
+
+  box-sizing: content-box;
+  width: $btn-close-width;
+  height: $btn-close-height;
+  padding: $btn-close-padding-y $btn-close-padding-x;
+  color: var(--#{$prefix}btn-close-color);
+  background: transparent var(--#{$prefix}btn-close-bg) center / $btn-close-width auto no-repeat; // include transparent for button elements
+  border: 0; // for button elements
+  @include border-radius();
+  opacity: var(--#{$prefix}btn-close-opacity);
 
   // Override <a>'s hover style
-  @include hover() {
-    color: $close-color;
+  &:hover {
+    color: var(--#{$prefix}btn-close-color);
     text-decoration: none;
+    opacity: var(--#{$prefix}btn-close-hover-opacity);
   }
 
-  &:not(:disabled):not(.disabled) {
-    @include hover-focus() {
-      opacity: .75;
-    }
+  &:focus {
+    outline: 0;
+    box-shadow: var(--#{$prefix}btn-close-focus-shadow);
+    opacity: var(--#{$prefix}btn-close-focus-opacity);
   }
-}
 
-// Additional properties for button version
-// iOS requires the button element instead of an anchor tag.
-// If you want the anchor version, it requires `href="#"`.
-// See https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile
+  &:disabled,
+  &.disabled {
+    pointer-events: none;
+    user-select: none;
+    opacity: var(--#{$prefix}btn-close-disabled-opacity);
+  }
+}
 
-// stylelint-disable-next-line selector-no-qualifying-type
-button.close {
-  padding: 0;
-  background-color: transparent;
-  border: 0;
+@mixin btn-close-white() {
+  filter: var(--#{$prefix}btn-close-white-filter);
 }
 
-// Future-proof disabling of clicks on `<a>` elements
+.btn-close-white {
+  @include btn-close-white();
+}
 
-// stylelint-disable-next-line selector-no-qualifying-type
-a.close.disabled {
-  pointer-events: none;
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .btn-close {
+      @include btn-close-white();
+    }
+  }
 }
diff --git a/_sass/bootstrap/_code.scss b/_sass/bootstrap/_code.scss
deleted file mode 100644
index 4bc117a96d..0000000000
--- a/_sass/bootstrap/_code.scss
+++ /dev/null
@@ -1,48 +0,0 @@
-// Inline code
-code {
-  @include font-size($code-font-size);
-  color: $code-color;
-  word-wrap: break-word;
-
-  // Streamline the style when inside anchors to avoid broken underline and more
-  a > & {
-    color: inherit;
-  }
-}
-
-// User input typically entered via keyboard
-kbd {
-  padding: $kbd-padding-y $kbd-padding-x;
-  @include font-size($kbd-font-size);
-  color: $kbd-color;
-  background-color: $kbd-bg;
-  @include border-radius($border-radius-sm);
-  @include box-shadow($kbd-box-shadow);
-
-  kbd {
-    padding: 0;
-    @include font-size(100%);
-    font-weight: $nested-kbd-font-weight;
-    @include box-shadow(none);
-  }
-}
-
-// Blocks of code
-pre {
-  display: block;
-  @include font-size($code-font-size);
-  color: $pre-color;
-
-  // Account for some code outputs that place code tags in pre tags
-  code {
-    @include font-size(inherit);
-    color: inherit;
-    word-break: normal;
-  }
-}
-
-// Enable scrollable blocks of code
-.pre-scrollable {
-  max-height: $pre-scrollable-max-height;
-  overflow-y: scroll;
-}
diff --git a/_sass/bootstrap/_containers.scss b/_sass/bootstrap/_containers.scss
new file mode 100644
index 0000000000..83b31381bf
--- /dev/null
+++ b/_sass/bootstrap/_containers.scss
@@ -0,0 +1,41 @@
+// Container widths
+//
+// Set the container width, and override it for fixed navbars in media queries.
+
+@if $enable-container-classes {
+  // Single container class with breakpoint max-widths
+  .container,
+  // 100% wide container at all breakpoints
+  .container-fluid {
+    @include make-container();
+  }
+
+  // Responsive containers that are 100% wide until a breakpoint
+  @each $breakpoint, $container-max-width in $container-max-widths {
+    .container-#{$breakpoint} {
+      @extend .container-fluid;
+    }
+
+    @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
+      %responsive-container-#{$breakpoint} {
+        max-width: $container-max-width;
+      }
+
+      // Extend each breakpoint which is smaller or equal to the current breakpoint
+      $extend-breakpoint: true;
+
+      @each $name, $width in $grid-breakpoints {
+        @if ($extend-breakpoint) {
+          .container#{breakpoint-infix($name, $grid-breakpoints)} {
+            @extend %responsive-container-#{$breakpoint};
+          }
+
+          // Once the current breakpoint is reached, stop extending
+          @if ($breakpoint == $name) {
+            $extend-breakpoint: false;
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/_sass/bootstrap/_custom-forms.scss b/_sass/bootstrap/_custom-forms.scss
deleted file mode 100644
index 06725ff364..0000000000
--- a/_sass/bootstrap/_custom-forms.scss
+++ /dev/null
@@ -1,526 +0,0 @@
-// Embedded icons from Open Iconic.
-// Released under MIT and copyright 2014 Waybury.
-// https://useiconic.com/open
-
-
-// Checkboxes and radios
-//
-// Base class takes care of all the key behavioral aspects.
-
-.custom-control {
-  position: relative;
-  z-index: 1;
-  display: block;
-  min-height: $font-size-base * $line-height-base;
-  padding-left: $custom-control-gutter + $custom-control-indicator-size;
-  color-adjust: exact; // Keep themed appearance for print
-}
-
-.custom-control-inline {
-  display: inline-flex;
-  margin-right: $custom-control-spacer-x;
-}
-
-.custom-control-input {
-  position: absolute;
-  left: 0;
-  z-index: -1; // Put the input behind the label so it doesn't overlay text
-  width: $custom-control-indicator-size;
-  height: ($font-size-base * $line-height-base + $custom-control-indicator-size) / 2;
-  opacity: 0;
-
-  &:checked ~ .custom-control-label::before {
-    color: $custom-control-indicator-checked-color;
-    border-color: $custom-control-indicator-checked-border-color;
-    @include gradient-bg($custom-control-indicator-checked-bg);
-    @include box-shadow($custom-control-indicator-checked-box-shadow);
-  }
-
-  &:focus ~ .custom-control-label::before {
-    // the mixin is not used here to make sure there is feedback
-    @if $enable-shadows {
-      box-shadow: $input-box-shadow, $custom-control-indicator-focus-box-shadow;
-    } @else {
-      box-shadow: $custom-control-indicator-focus-box-shadow;
-    }
-  }
-
-  &:focus:not(:checked) ~ .custom-control-label::before {
-    border-color: $custom-control-indicator-focus-border-color;
-  }
-
-  &:not(:disabled):active ~ .custom-control-label::before {
-    color: $custom-control-indicator-active-color;
-    background-color: $custom-control-indicator-active-bg;
-    border-color: $custom-control-indicator-active-border-color;
-    @include box-shadow($custom-control-indicator-active-box-shadow);
-  }
-
-  // Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
-  &[disabled],
-  &:disabled {
-    ~ .custom-control-label {
-      color: $custom-control-label-disabled-color;
-
-      &::before {
-        background-color: $custom-control-indicator-disabled-bg;
-      }
-    }
-  }
-}
-
-// Custom control indicators
-//
-// Build the custom controls out of pseudo-elements.
-
-.custom-control-label {
-  position: relative;
-  margin-bottom: 0;
-  color: $custom-control-label-color;
-  vertical-align: top;
-  cursor: $custom-control-cursor;
-
-  // Background-color and (when enabled) gradient
-  &::before {
-    position: absolute;
-    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) / 2;
-    left: -($custom-control-gutter + $custom-control-indicator-size);
-    display: block;
-    width: $custom-control-indicator-size;
-    height: $custom-control-indicator-size;
-    pointer-events: none;
-    content: "";
-    background-color: $custom-control-indicator-bg;
-    border: $custom-control-indicator-border-color solid $custom-control-indicator-border-width;
-    @include box-shadow($custom-control-indicator-box-shadow);
-  }
-
-  // Foreground (icon)
-  &::after {
-    position: absolute;
-    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) / 2;
-    left: -($custom-control-gutter + $custom-control-indicator-size);
-    display: block;
-    width: $custom-control-indicator-size;
-    height: $custom-control-indicator-size;
-    content: "";
-    background: 50% / #{$custom-control-indicator-bg-size} no-repeat;
-  }
-}
-
-
-// Checkboxes
-//
-// Tweak just a few things for checkboxes.
-
-.custom-checkbox {
-  .custom-control-label::before {
-    @include border-radius($custom-checkbox-indicator-border-radius);
-  }
-
-  .custom-control-input:checked ~ .custom-control-label {
-    &::after {
-      background-image: escape-svg($custom-checkbox-indicator-icon-checked);
-    }
-  }
-
-  .custom-control-input:indeterminate ~ .custom-control-label {
-    &::before {
-      border-color: $custom-checkbox-indicator-indeterminate-border-color;
-      @include gradient-bg($custom-checkbox-indicator-indeterminate-bg);
-      @include box-shadow($custom-checkbox-indicator-indeterminate-box-shadow);
-    }
-    &::after {
-      background-image: escape-svg($custom-checkbox-indicator-icon-indeterminate);
-    }
-  }
-
-  .custom-control-input:disabled {
-    &:checked ~ .custom-control-label::before {
-      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
-    }
-    &:indeterminate ~ .custom-control-label::before {
-      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
-    }
-  }
-}
-
-// Radios
-//
-// Tweak just a few things for radios.
-
-.custom-radio {
-  .custom-control-label::before {
-    // stylelint-disable-next-line property-disallowed-list
-    border-radius: $custom-radio-indicator-border-radius;
-  }
-
-  .custom-control-input:checked ~ .custom-control-label {
-    &::after {
-      background-image: escape-svg($custom-radio-indicator-icon-checked);
-    }
-  }
-
-  .custom-control-input:disabled {
-    &:checked ~ .custom-control-label::before {
-      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
-    }
-  }
-}
-
-
-// switches
-//
-// Tweak a few things for switches
-
-.custom-switch {
-  padding-left: $custom-switch-width + $custom-control-gutter;
-
-  .custom-control-label {
-    &::before {
-      left: -($custom-switch-width + $custom-control-gutter);
-      width: $custom-switch-width;
-      pointer-events: all;
-      // stylelint-disable-next-line property-disallowed-list
-      border-radius: $custom-switch-indicator-border-radius;
-    }
-
-    &::after {
-      top: add(($font-size-base * $line-height-base - $custom-control-indicator-size) / 2, $custom-control-indicator-border-width * 2);
-      left: add(-($custom-switch-width + $custom-control-gutter), $custom-control-indicator-border-width * 2);
-      width: $custom-switch-indicator-size;
-      height: $custom-switch-indicator-size;
-      background-color: $custom-control-indicator-border-color;
-      // stylelint-disable-next-line property-disallowed-list
-      border-radius: $custom-switch-indicator-border-radius;
-      @include transition(transform .15s ease-in-out, $custom-forms-transition);
-    }
-  }
-
-  .custom-control-input:checked ~ .custom-control-label {
-    &::after {
-      background-color: $custom-control-indicator-bg;
-      transform: translateX($custom-switch-width - $custom-control-indicator-size);
-    }
-  }
-
-  .custom-control-input:disabled {
-    &:checked ~ .custom-control-label::before {
-      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
-    }
-  }
-}
-
-
-// Select
-//
-// Replaces the browser default select with a custom one, mostly pulled from
-// https://primer.github.io/.
-//
-
-.custom-select {
-  display: inline-block;
-  width: 100%;
-  height: $custom-select-height;
-  padding: $custom-select-padding-y ($custom-select-padding-x + $custom-select-indicator-padding) $custom-select-padding-y $custom-select-padding-x;
-  font-family: $custom-select-font-family;
-  @include font-size($custom-select-font-size);
-  font-weight: $custom-select-font-weight;
-  line-height: $custom-select-line-height;
-  color: $custom-select-color;
-  vertical-align: middle;
-  background: $custom-select-bg $custom-select-background;
-  border: $custom-select-border-width solid $custom-select-border-color;
-  @include border-radius($custom-select-border-radius, 0);
-  @include box-shadow($custom-select-box-shadow);
-  appearance: none;
-
-  &:focus {
-    border-color: $custom-select-focus-border-color;
-    outline: 0;
-    @if $enable-shadows {
-      @include box-shadow($custom-select-box-shadow, $custom-select-focus-box-shadow);
-    } @else {
-      // Avoid using mixin so we can pass custom focus shadow properly
-      box-shadow: $custom-select-focus-box-shadow;
-    }
-
-    &::-ms-value {
-      // For visual consistency with other platforms/browsers,
-      // suppress the default white text on blue background highlight given to
-      // the selected option text when the (still closed) <select> receives focus
-      // in IE and (under certain conditions) Edge.
-      // See https://github.com/twbs/bootstrap/issues/19398.
-      color: $input-color;
-      background-color: $input-bg;
-    }
-  }
-
-  &[multiple],
-  &[size]:not([size="1"]) {
-    height: auto;
-    padding-right: $custom-select-padding-x;
-    background-image: none;
-  }
-
-  &:disabled {
-    color: $custom-select-disabled-color;
-    background-color: $custom-select-disabled-bg;
-  }
-
-  // Hides the default caret in IE11
-  &::-ms-expand {
-    display: none;
-  }
-
-  // Remove outline from select box in FF
-  &:-moz-focusring {
-    color: transparent;
-    text-shadow: 0 0 0 $custom-select-color;
-  }
-}
-
-.custom-select-sm {
-  height: $custom-select-height-sm;
-  padding-top: $custom-select-padding-y-sm;
-  padding-bottom: $custom-select-padding-y-sm;
-  padding-left: $custom-select-padding-x-sm;
-  @include font-size($custom-select-font-size-sm);
-}
-
-.custom-select-lg {
-  height: $custom-select-height-lg;
-  padding-top: $custom-select-padding-y-lg;
-  padding-bottom: $custom-select-padding-y-lg;
-  padding-left: $custom-select-padding-x-lg;
-  @include font-size($custom-select-font-size-lg);
-}
-
-
-// File
-//
-// Custom file input.
-
-.custom-file {
-  position: relative;
-  display: inline-block;
-  width: 100%;
-  height: $custom-file-height;
-  margin-bottom: 0;
-}
-
-.custom-file-input {
-  position: relative;
-  z-index: 2;
-  width: 100%;
-  height: $custom-file-height;
-  margin: 0;
-  overflow: hidden;
-  opacity: 0;
-
-  &:focus ~ .custom-file-label {
-    border-color: $custom-file-focus-border-color;
-    box-shadow: $custom-file-focus-box-shadow;
-  }
-
-  // Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
-  &[disabled] ~ .custom-file-label,
-  &:disabled ~ .custom-file-label {
-    background-color: $custom-file-disabled-bg;
-  }
-
-  @each $lang, $value in $custom-file-text {
-    &:lang(#{$lang}) ~ .custom-file-label::after {
-      content: $value;
-    }
-  }
-
-  ~ .custom-file-label[data-browse]::after {
-    content: attr(data-browse);
-  }
-}
-
-.custom-file-label {
-  position: absolute;
-  top: 0;
-  right: 0;
-  left: 0;
-  z-index: 1;
-  height: $custom-file-height;
-  padding: $custom-file-padding-y $custom-file-padding-x;
-  overflow: hidden;
-  font-family: $custom-file-font-family;
-  font-weight: $custom-file-font-weight;
-  line-height: $custom-file-line-height;
-  color: $custom-file-color;
-  background-color: $custom-file-bg;
-  border: $custom-file-border-width solid $custom-file-border-color;
-  @include border-radius($custom-file-border-radius);
-  @include box-shadow($custom-file-box-shadow);
-
-  &::after {
-    position: absolute;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    z-index: 3;
-    display: block;
-    height: $custom-file-height-inner;
-    padding: $custom-file-padding-y $custom-file-padding-x;
-    line-height: $custom-file-line-height;
-    color: $custom-file-button-color;
-    content: "Browse";
-    @include gradient-bg($custom-file-button-bg);
-    border-left: inherit;
-    @include border-radius(0 $custom-file-border-radius $custom-file-border-radius 0);
-  }
-}
-
-// Range
-//
-// Style range inputs the same across browsers. Vendor-specific rules for pseudo
-// elements cannot be mixed. As such, there are no shared styles for focus or
-// active states on prefixed selectors.
-
-.custom-range {
-  width: 100%;
-  height: add($custom-range-thumb-height, $custom-range-thumb-focus-box-shadow-width * 2);
-  padding: 0; // Need to reset padding
-  background-color: transparent;
-  appearance: none;
-
-  &:focus {
-    outline: 0;
-
-    // Pseudo-elements must be split across multiple rulesets to have an effect.
-    // No box-shadow() mixin for focus accessibility.
-    &::-webkit-slider-thumb { box-shadow: $custom-range-thumb-focus-box-shadow; }
-    &::-moz-range-thumb     { box-shadow: $custom-range-thumb-focus-box-shadow; }
-    &::-ms-thumb            { box-shadow: $custom-range-thumb-focus-box-shadow; }
-  }
-
-  &::-moz-focus-outer {
-    border: 0;
-  }
-
-  &::-webkit-slider-thumb {
-    width: $custom-range-thumb-width;
-    height: $custom-range-thumb-height;
-    margin-top: ($custom-range-track-height - $custom-range-thumb-height) / 2; // Webkit specific
-    @include gradient-bg($custom-range-thumb-bg);
-    border: $custom-range-thumb-border;
-    @include border-radius($custom-range-thumb-border-radius);
-    @include box-shadow($custom-range-thumb-box-shadow);
-    @include transition($custom-forms-transition);
-    appearance: none;
-
-    &:active {
-      @include gradient-bg($custom-range-thumb-active-bg);
-    }
-  }
-
-  &::-webkit-slider-runnable-track {
-    width: $custom-range-track-width;
-    height: $custom-range-track-height;
-    color: transparent; // Why?
-    cursor: $custom-range-track-cursor;
-    background-color: $custom-range-track-bg;
-    border-color: transparent;
-    @include border-radius($custom-range-track-border-radius);
-    @include box-shadow($custom-range-track-box-shadow);
-  }
-
-  &::-moz-range-thumb {
-    width: $custom-range-thumb-width;
-    height: $custom-range-thumb-height;
-    @include gradient-bg($custom-range-thumb-bg);
-    border: $custom-range-thumb-border;
-    @include border-radius($custom-range-thumb-border-radius);
-    @include box-shadow($custom-range-thumb-box-shadow);
-    @include transition($custom-forms-transition);
-    appearance: none;
-
-    &:active {
-      @include gradient-bg($custom-range-thumb-active-bg);
-    }
-  }
-
-  &::-moz-range-track {
-    width: $custom-range-track-width;
-    height: $custom-range-track-height;
-    color: transparent;
-    cursor: $custom-range-track-cursor;
-    background-color: $custom-range-track-bg;
-    border-color: transparent; // Firefox specific?
-    @include border-radius($custom-range-track-border-radius);
-    @include box-shadow($custom-range-track-box-shadow);
-  }
-
-  &::-ms-thumb {
-    width: $custom-range-thumb-width;
-    height: $custom-range-thumb-height;
-    margin-top: 0; // Edge specific
-    margin-right: $custom-range-thumb-focus-box-shadow-width; // Workaround that overflowed box-shadow is hidden.
-    margin-left: $custom-range-thumb-focus-box-shadow-width;  // Workaround that overflowed box-shadow is hidden.
-    @include gradient-bg($custom-range-thumb-bg);
-    border: $custom-range-thumb-border;
-    @include border-radius($custom-range-thumb-border-radius);
-    @include box-shadow($custom-range-thumb-box-shadow);
-    @include transition($custom-forms-transition);
-    appearance: none;
-
-    &:active {
-      @include gradient-bg($custom-range-thumb-active-bg);
-    }
-  }
-
-  &::-ms-track {
-    width: $custom-range-track-width;
-    height: $custom-range-track-height;
-    color: transparent;
-    cursor: $custom-range-track-cursor;
-    background-color: transparent;
-    border-color: transparent;
-    border-width: $custom-range-thumb-height / 2;
-    @include box-shadow($custom-range-track-box-shadow);
-  }
-
-  &::-ms-fill-lower {
-    background-color: $custom-range-track-bg;
-    @include border-radius($custom-range-track-border-radius);
-  }
-
-  &::-ms-fill-upper {
-    margin-right: 15px; // arbitrary?
-    background-color: $custom-range-track-bg;
-    @include border-radius($custom-range-track-border-radius);
-  }
-
-  &:disabled {
-    &::-webkit-slider-thumb {
-      background-color: $custom-range-thumb-disabled-bg;
-    }
-
-    &::-webkit-slider-runnable-track {
-      cursor: default;
-    }
-
-    &::-moz-range-thumb {
-      background-color: $custom-range-thumb-disabled-bg;
-    }
-
-    &::-moz-range-track {
-      cursor: default;
-    }
-
-    &::-ms-thumb {
-      background-color: $custom-range-thumb-disabled-bg;
-    }
-  }
-}
-
-.custom-control-label::before,
-.custom-file-label,
-.custom-select {
-  @include transition($custom-forms-transition);
-}
diff --git a/_sass/bootstrap/_dropdown.scss b/_sass/bootstrap/_dropdown.scss
index f39de11857..587ebb487c 100644
--- a/_sass/bootstrap/_dropdown.scss
+++ b/_sass/bootstrap/_dropdown.scss
@@ -1,8 +1,10 @@
 // The dropdown wrapper (`<div>`)
 .dropup,
-.dropright,
+.dropend,
 .dropdown,
-.dropleft {
+.dropstart,
+.dropup-center,
+.dropdown-center {
   position: relative;
 }
 
@@ -15,50 +17,107 @@
 
 // The dropdown menu
 .dropdown-menu {
+  // scss-docs-start dropdown-css-vars
+  --#{$prefix}dropdown-zindex: #{$zindex-dropdown};
+  --#{$prefix}dropdown-min-width: #{$dropdown-min-width};
+  --#{$prefix}dropdown-padding-x: #{$dropdown-padding-x};
+  --#{$prefix}dropdown-padding-y: #{$dropdown-padding-y};
+  --#{$prefix}dropdown-spacer: #{$dropdown-spacer};
+  @include rfs($dropdown-font-size, --#{$prefix}dropdown-font-size);
+  --#{$prefix}dropdown-color: #{$dropdown-color};
+  --#{$prefix}dropdown-bg: #{$dropdown-bg};
+  --#{$prefix}dropdown-border-color: #{$dropdown-border-color};
+  --#{$prefix}dropdown-border-radius: #{$dropdown-border-radius};
+  --#{$prefix}dropdown-border-width: #{$dropdown-border-width};
+  --#{$prefix}dropdown-inner-border-radius: #{$dropdown-inner-border-radius};
+  --#{$prefix}dropdown-divider-bg: #{$dropdown-divider-bg};
+  --#{$prefix}dropdown-divider-margin-y: #{$dropdown-divider-margin-y};
+  --#{$prefix}dropdown-box-shadow: #{$dropdown-box-shadow};
+  --#{$prefix}dropdown-link-color: #{$dropdown-link-color};
+  --#{$prefix}dropdown-link-hover-color: #{$dropdown-link-hover-color};
+  --#{$prefix}dropdown-link-hover-bg: #{$dropdown-link-hover-bg};
+  --#{$prefix}dropdown-link-active-color: #{$dropdown-link-active-color};
+  --#{$prefix}dropdown-link-active-bg: #{$dropdown-link-active-bg};
+  --#{$prefix}dropdown-link-disabled-color: #{$dropdown-link-disabled-color};
+  --#{$prefix}dropdown-item-padding-x: #{$dropdown-item-padding-x};
+  --#{$prefix}dropdown-item-padding-y: #{$dropdown-item-padding-y};
+  --#{$prefix}dropdown-header-color: #{$dropdown-header-color};
+  --#{$prefix}dropdown-header-padding-x: #{$dropdown-header-padding-x};
+  --#{$prefix}dropdown-header-padding-y: #{$dropdown-header-padding-y};
+  // scss-docs-end dropdown-css-vars
+
   position: absolute;
-  top: 100%;
-  left: 0;
-  z-index: $zindex-dropdown;
+  z-index: var(--#{$prefix}dropdown-zindex);
   display: none; // none by default, but block on "open" of the menu
-  float: left;
-  min-width: $dropdown-min-width;
-  padding: $dropdown-padding-y $dropdown-padding-x;
-  margin: $dropdown-spacer 0 0; // override default ul
-  @include font-size($dropdown-font-size);
-  color: $dropdown-color;
+  min-width: var(--#{$prefix}dropdown-min-width);
+  padding: var(--#{$prefix}dropdown-padding-y) var(--#{$prefix}dropdown-padding-x);
+  margin: 0; // Override default margin of ul
+  @include font-size(var(--#{$prefix}dropdown-font-size));
+  color: var(--#{$prefix}dropdown-color);
   text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
   list-style: none;
-  background-color: $dropdown-bg;
+  background-color: var(--#{$prefix}dropdown-bg);
   background-clip: padding-box;
-  border: $dropdown-border-width solid $dropdown-border-color;
-  @include border-radius($dropdown-border-radius);
-  @include box-shadow($dropdown-box-shadow);
+  border: var(--#{$prefix}dropdown-border-width) solid var(--#{$prefix}dropdown-border-color);
+  @include border-radius(var(--#{$prefix}dropdown-border-radius));
+  @include box-shadow(var(--#{$prefix}dropdown-box-shadow));
+
+  &[data-bs-popper] {
+    top: 100%;
+    left: 0;
+    margin-top: var(--#{$prefix}dropdown-spacer);
+  }
+
+  @if $dropdown-padding-y == 0 {
+    > .dropdown-item:first-child,
+    > li:first-child .dropdown-item {
+      @include border-top-radius(var(--#{$prefix}dropdown-inner-border-radius));
+    }
+    > .dropdown-item:last-child,
+    > li:last-child .dropdown-item {
+      @include border-bottom-radius(var(--#{$prefix}dropdown-inner-border-radius));
+    }
+
+  }
 }
 
+// scss-docs-start responsive-breakpoints
+// We deliberately hardcode the `bs-` prefix because we check
+// this custom property in JS to determine Popper's positioning
+
 @each $breakpoint in map-keys($grid-breakpoints) {
   @include media-breakpoint-up($breakpoint) {
     $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
 
-    .dropdown-menu#{$infix}-left {
-      right: auto;
-      left: 0;
+    .dropdown-menu#{$infix}-start {
+      --bs-position: start;
+
+      &[data-bs-popper] {
+        right: auto;
+        left: 0;
+      }
     }
 
-    .dropdown-menu#{$infix}-right {
-      right: 0;
-      left: auto;
+    .dropdown-menu#{$infix}-end {
+      --bs-position: end;
+
+      &[data-bs-popper] {
+        right: 0;
+        left: auto;
+      }
     }
   }
 }
+// scss-docs-end responsive-breakpoints
 
 // Allow for dropdowns to go bottom up (aka, dropup-menu)
 // Just add .dropup after the standard .dropdown class and you're set.
 .dropup {
-  .dropdown-menu {
+  .dropdown-menu[data-bs-popper] {
     top: auto;
     bottom: 100%;
     margin-top: 0;
-    margin-bottom: $dropdown-spacer;
+    margin-bottom: var(--#{$prefix}dropdown-spacer);
   }
 
   .dropdown-toggle {
@@ -66,55 +125,48 @@
   }
 }
 
-.dropright {
-  .dropdown-menu {
+.dropend {
+  .dropdown-menu[data-bs-popper] {
     top: 0;
     right: auto;
     left: 100%;
     margin-top: 0;
-    margin-left: $dropdown-spacer;
+    margin-left: var(--#{$prefix}dropdown-spacer);
   }
 
   .dropdown-toggle {
-    @include caret(right);
+    @include caret(end);
     &::after {
       vertical-align: 0;
     }
   }
 }
 
-.dropleft {
-  .dropdown-menu {
+.dropstart {
+  .dropdown-menu[data-bs-popper] {
     top: 0;
     right: 100%;
     left: auto;
     margin-top: 0;
-    margin-right: $dropdown-spacer;
+    margin-right: var(--#{$prefix}dropdown-spacer);
   }
 
   .dropdown-toggle {
-    @include caret(left);
+    @include caret(start);
     &::before {
       vertical-align: 0;
     }
   }
 }
 
-// When Popper is enabled, reset the basic dropdown position
-// stylelint-disable-next-line no-duplicate-selectors
-.dropdown-menu {
-  &[x-placement^="top"],
-  &[x-placement^="right"],
-  &[x-placement^="bottom"],
-  &[x-placement^="left"] {
-    right: auto;
-    bottom: auto;
-  }
-}
 
 // Dividers (basically an `<hr>`) within the dropdown
 .dropdown-divider {
-  @include nav-divider($dropdown-divider-bg, $dropdown-divider-margin-y, true);
+  height: 0;
+  margin: var(--#{$prefix}dropdown-divider-margin-y) 0;
+  overflow: hidden;
+  border-top: 1px solid var(--#{$prefix}dropdown-divider-bg);
+  opacity: 1; // Revisit in v6 to de-dupe styles that conflict with <hr> element
 }
 
 // Links, buttons, and more within the dropdown menu
@@ -123,50 +175,38 @@
 .dropdown-item {
   display: block;
   width: 100%; // For `<button>`s
-  padding: $dropdown-item-padding-y $dropdown-item-padding-x;
+  padding: var(--#{$prefix}dropdown-item-padding-y) var(--#{$prefix}dropdown-item-padding-x);
   clear: both;
   font-weight: $font-weight-normal;
-  color: $dropdown-link-color;
+  color: var(--#{$prefix}dropdown-link-color);
   text-align: inherit; // For `<button>`s
   text-decoration: if($link-decoration == none, null, none);
   white-space: nowrap; // prevent links from randomly breaking onto new lines
   background-color: transparent; // For `<button>`s
   border: 0; // For `<button>`s
+  @include border-radius(var(--#{$prefix}dropdown-item-border-radius, 0));
 
-  // Prevent dropdown overflow if there's no padding
-  // See https://github.com/twbs/bootstrap/pull/27703
-  @if $dropdown-padding-y == 0 {
-    &:first-child {
-      @include border-top-radius($dropdown-inner-border-radius);
-    }
-
-    &:last-child {
-      @include border-bottom-radius($dropdown-inner-border-radius);
-    }
-  }
-
-  @include hover-focus() {
-    color: $dropdown-link-hover-color;
-    text-decoration: none;
-    @include gradient-bg($dropdown-link-hover-bg);
+  &:hover,
+  &:focus {
+    color: var(--#{$prefix}dropdown-link-hover-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
+    @include gradient-bg(var(--#{$prefix}dropdown-link-hover-bg));
   }
 
   &.active,
   &:active {
-    color: $dropdown-link-active-color;
+    color: var(--#{$prefix}dropdown-link-active-color);
     text-decoration: none;
-    @include gradient-bg($dropdown-link-active-bg);
+    @include gradient-bg(var(--#{$prefix}dropdown-link-active-bg));
   }
 
   &.disabled,
   &:disabled {
-    color: $dropdown-link-disabled-color;
+    color: var(--#{$prefix}dropdown-link-disabled-color);
     pointer-events: none;
     background-color: transparent;
     // Remove CSS gradients if they're enabled
-    @if $enable-gradients {
-      background-image: none;
-    }
+    background-image: if($enable-gradients, none, null);
   }
 }
 
@@ -177,16 +217,34 @@
 // Dropdown section headers
 .dropdown-header {
   display: block;
-  padding: $dropdown-header-padding;
+  padding: var(--#{$prefix}dropdown-header-padding-y) var(--#{$prefix}dropdown-header-padding-x);
   margin-bottom: 0; // for use with heading elements
   @include font-size($font-size-sm);
-  color: $dropdown-header-color;
+  color: var(--#{$prefix}dropdown-header-color);
   white-space: nowrap; // as with > li > a
 }
 
 // Dropdown text
 .dropdown-item-text {
   display: block;
-  padding: $dropdown-item-padding-y $dropdown-item-padding-x;
-  color: $dropdown-link-color;
+  padding: var(--#{$prefix}dropdown-item-padding-y) var(--#{$prefix}dropdown-item-padding-x);
+  color: var(--#{$prefix}dropdown-link-color);
+}
+
+// Dark dropdowns
+.dropdown-menu-dark {
+  // scss-docs-start dropdown-dark-css-vars
+  --#{$prefix}dropdown-color: #{$dropdown-dark-color};
+  --#{$prefix}dropdown-bg: #{$dropdown-dark-bg};
+  --#{$prefix}dropdown-border-color: #{$dropdown-dark-border-color};
+  --#{$prefix}dropdown-box-shadow: #{$dropdown-dark-box-shadow};
+  --#{$prefix}dropdown-link-color: #{$dropdown-dark-link-color};
+  --#{$prefix}dropdown-link-hover-color: #{$dropdown-dark-link-hover-color};
+  --#{$prefix}dropdown-divider-bg: #{$dropdown-dark-divider-bg};
+  --#{$prefix}dropdown-link-hover-bg: #{$dropdown-dark-link-hover-bg};
+  --#{$prefix}dropdown-link-active-color: #{$dropdown-dark-link-active-color};
+  --#{$prefix}dropdown-link-active-bg: #{$dropdown-dark-link-active-bg};
+  --#{$prefix}dropdown-link-disabled-color: #{$dropdown-dark-link-disabled-color};
+  --#{$prefix}dropdown-header-color: #{$dropdown-dark-header-color};
+  // scss-docs-end dropdown-dark-css-vars
 }
diff --git a/_sass/bootstrap/_forms.scss b/_sass/bootstrap/_forms.scss
index 66a4efe1d4..7b17d849ac 100644
--- a/_sass/bootstrap/_forms.scss
+++ b/_sass/bootstrap/_forms.scss
@@ -1,347 +1,9 @@
-// stylelint-disable selector-no-qualifying-type
-
-//
-// Textual form controls
-//
-
-.form-control {
-  display: block;
-  width: 100%;
-  height: $input-height;
-  padding: $input-padding-y $input-padding-x;
-  font-family: $input-font-family;
-  @include font-size($input-font-size);
-  font-weight: $input-font-weight;
-  line-height: $input-line-height;
-  color: $input-color;
-  background-color: $input-bg;
-  background-clip: padding-box;
-  border: $input-border-width solid $input-border-color;
-
-  // Note: This has no effect on <select>s in some browsers, due to the limited stylability of `<select>`s in CSS.
-  @include border-radius($input-border-radius, 0);
-
-  @include box-shadow($input-box-shadow);
-  @include transition($input-transition);
-
-  // Unstyle the caret on `<select>`s in IE10+.
-  &::-ms-expand {
-    background-color: transparent;
-    border: 0;
-  }
-
-  // Remove select outline from select box in FF
-  &:-moz-focusring {
-    color: transparent;
-    text-shadow: 0 0 0 $input-color;
-  }
-
-  // Customize the `:focus` state to imitate native WebKit styles.
-  @include form-control-focus($ignore-warning: true);
-
-  // Placeholder
-  &::placeholder {
-    color: $input-placeholder-color;
-    // Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526.
-    opacity: 1;
-  }
-
-  // Disabled and read-only inputs
-  //
-  // HTML5 says that controls under a fieldset > legend:first-child won't be
-  // disabled if the fieldset is disabled. Due to implementation difficulty, we
-  // don't honor that edge case; we style them as disabled anyway.
-  &:disabled,
-  &[readonly] {
-    background-color: $input-disabled-bg;
-    // iOS fix for unreadable disabled content; see https://github.com/twbs/bootstrap/issues/11655.
-    opacity: 1;
-  }
-}
-
-input[type="date"],
-input[type="time"],
-input[type="datetime-local"],
-input[type="month"] {
-  &.form-control {
-    appearance: none; // Fix appearance for date inputs in Safari
-  }
-}
-
-select.form-control {
-  &:focus::-ms-value {
-    // Suppress the nested default white text on blue background highlight given to
-    // the selected option text when the (still closed) <select> receives focus
-    // in IE and (under certain conditions) Edge, as it looks bad and cannot be made to
-    // match the appearance of the native widget.
-    // See https://github.com/twbs/bootstrap/issues/19398.
-    color: $input-color;
-    background-color: $input-bg;
-  }
-}
-
-// Make file inputs better match text inputs by forcing them to new lines.
-.form-control-file,
-.form-control-range {
-  display: block;
-  width: 100%;
-}
-
-
-//
-// Labels
-//
-
-// For use with horizontal and inline forms, when you need the label (or legend)
-// text to align with the form controls.
-.col-form-label {
-  padding-top: add($input-padding-y, $input-border-width);
-  padding-bottom: add($input-padding-y, $input-border-width);
-  margin-bottom: 0; // Override the `<label>/<legend>` default
-  @include font-size(inherit); // Override the `<legend>` default
-  line-height: $input-line-height;
-}
-
-.col-form-label-lg {
-  padding-top: add($input-padding-y-lg, $input-border-width);
-  padding-bottom: add($input-padding-y-lg, $input-border-width);
-  @include font-size($input-font-size-lg);
-  line-height: $input-line-height-lg;
-}
-
-.col-form-label-sm {
-  padding-top: add($input-padding-y-sm, $input-border-width);
-  padding-bottom: add($input-padding-y-sm, $input-border-width);
-  @include font-size($input-font-size-sm);
-  line-height: $input-line-height-sm;
-}
-
-
-// Readonly controls as plain text
-//
-// Apply class to a readonly input to make it appear like regular plain
-// text (without any border, background color, focus indicator)
-
-.form-control-plaintext {
-  display: block;
-  width: 100%;
-  padding: $input-padding-y 0;
-  margin-bottom: 0; // match inputs if this class comes on inputs with default margins
-  @include font-size($input-font-size);
-  line-height: $input-line-height;
-  color: $input-plaintext-color;
-  background-color: transparent;
-  border: solid transparent;
-  border-width: $input-border-width 0;
-
-  &.form-control-sm,
-  &.form-control-lg {
-    padding-right: 0;
-    padding-left: 0;
-  }
-}
-
-
-// Form control sizing
-//
-// Build on `.form-control` with modifier classes to decrease or increase the
-// height and font-size of form controls.
-//
-// Repeated in `_input_group.scss` to avoid Sass extend issues.
-
-.form-control-sm {
-  height: $input-height-sm;
-  padding: $input-padding-y-sm $input-padding-x-sm;
-  @include font-size($input-font-size-sm);
-  line-height: $input-line-height-sm;
-  @include border-radius($input-border-radius-sm);
-}
-
-.form-control-lg {
-  height: $input-height-lg;
-  padding: $input-padding-y-lg $input-padding-x-lg;
-  @include font-size($input-font-size-lg);
-  line-height: $input-line-height-lg;
-  @include border-radius($input-border-radius-lg);
-}
-
-// stylelint-disable-next-line no-duplicate-selectors
-select.form-control {
-  &[size],
-  &[multiple] {
-    height: auto;
-  }
-}
-
-textarea.form-control {
-  height: auto;
-}
-
-// Form groups
-//
-// Designed to help with the organization and spacing of vertical forms. For
-// horizontal forms, use the predefined grid classes.
-
-.form-group {
-  margin-bottom: $form-group-margin-bottom;
-}
-
-.form-text {
-  display: block;
-  margin-top: $form-text-margin-top;
-}
-
-
-// Form grid
-//
-// Special replacement for our grid system's `.row` for tighter form layouts.
-
-.form-row {
-  display: flex;
-  flex-wrap: wrap;
-  margin-right: -$form-grid-gutter-width / 2;
-  margin-left: -$form-grid-gutter-width / 2;
-
-  > .col,
-  > [class*="col-"] {
-    padding-right: $form-grid-gutter-width / 2;
-    padding-left: $form-grid-gutter-width / 2;
-  }
-}
-
-
-// Checkboxes and radios
-//
-// Indent the labels to position radios/checkboxes as hanging controls.
-
-.form-check {
-  position: relative;
-  display: block;
-  padding-left: $form-check-input-gutter;
-}
-
-.form-check-input {
-  position: absolute;
-  margin-top: $form-check-input-margin-y;
-  margin-left: -$form-check-input-gutter;
-
-  // Use [disabled] and :disabled for workaround https://github.com/twbs/bootstrap/issues/28247
-  &[disabled] ~ .form-check-label,
-  &:disabled ~ .form-check-label {
-    color: $text-muted;
-  }
-}
-
-.form-check-label {
-  margin-bottom: 0; // Override default `<label>` bottom margin
-}
-
-.form-check-inline {
-  display: inline-flex;
-  align-items: center;
-  padding-left: 0; // Override base .form-check
-  margin-right: $form-check-inline-margin-x;
-
-  // Undo .form-check-input defaults and add some `margin-right`.
-  .form-check-input {
-    position: static;
-    margin-top: 0;
-    margin-right: $form-check-inline-input-margin-x;
-    margin-left: 0;
-  }
-}
-
-
-// Form validation
-//
-// Provide feedback to users when form field values are valid or invalid. Works
-// primarily for client-side validation via scoped `:invalid` and `:valid`
-// pseudo-classes but also includes `.is-invalid` and `.is-valid` classes for
-// server side validation.
-
-@each $state, $data in $form-validation-states {
-  @include form-validation-state($state, map-get($data, color), map-get($data, icon));
-}
-
-// Inline forms
-//
-// Make forms appear inline(-block) by adding the `.form-inline` class. Inline
-// forms begin stacked on extra small (mobile) devices and then go inline when
-// viewports reach <768px.
-//
-// Requires wrapping inputs and labels with `.form-group` for proper display of
-// default HTML form controls and our custom form controls (e.g., input groups).
-
-.form-inline {
-  display: flex;
-  flex-flow: row wrap;
-  align-items: center; // Prevent shorter elements from growing to same height as others (e.g., small buttons growing to normal sized button height)
-
-  // Because we use flex, the initial sizing of checkboxes is collapsed and
-  // doesn't occupy the full-width (which is what we want for xs grid tier),
-  // so we force that here.
-  .form-check {
-    width: 100%;
-  }
-
-  // Kick in the inline
-  @include media-breakpoint-up(sm) {
-    label {
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      margin-bottom: 0;
-    }
-
-    // Inline-block all the things for "inline"
-    .form-group {
-      display: flex;
-      flex: 0 0 auto;
-      flex-flow: row wrap;
-      align-items: center;
-      margin-bottom: 0;
-    }
-
-    // Allow folks to *not* use `.form-group`
-    .form-control {
-      display: inline-block;
-      width: auto; // Prevent labels from stacking above inputs in `.form-group`
-      vertical-align: middle;
-    }
-
-    // Make static controls behave like regular ones
-    .form-control-plaintext {
-      display: inline-block;
-    }
-
-    .input-group,
-    .custom-select {
-      width: auto;
-    }
-
-    // Remove default margin on radios/checkboxes that were used for stacking, and
-    // then undo the floating of radios and checkboxes to match.
-    .form-check {
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      width: auto;
-      padding-left: 0;
-    }
-    .form-check-input {
-      position: relative;
-      flex-shrink: 0;
-      margin-top: 0;
-      margin-right: $form-check-input-margin-x;
-      margin-left: 0;
-    }
-
-    .custom-control {
-      align-items: center;
-      justify-content: center;
-    }
-    .custom-control-label {
-      margin-bottom: 0;
-    }
-  }
-}
+@import "forms/labels";
+@import "forms/form-text";
+@import "forms/form-control";
+@import "forms/form-select";
+@import "forms/form-check";
+@import "forms/form-range";
+@import "forms/floating-labels";
+@import "forms/input-group";
+@import "forms/validation";
diff --git a/_sass/bootstrap/_functions.scss b/_sass/bootstrap/_functions.scss
index 9c06603150..90296586b3 100644
--- a/_sass/bootstrap/_functions.scss
+++ b/_sass/bootstrap/_functions.scss
@@ -32,10 +32,84 @@
   }
 }
 
+// Colors
+@function to-rgb($value) {
+  @return red($value), green($value), blue($value);
+}
+
+// stylelint-disable scss/dollar-variable-pattern
+@function rgba-css-var($identifier, $target) {
+  @if $identifier == "body" and $target == "bg" {
+    @return rgba(var(--#{$prefix}#{$identifier}-bg-rgb), var(--#{$prefix}#{$target}-opacity));
+  } @if $identifier == "body" and $target == "text" {
+    @return rgba(var(--#{$prefix}#{$identifier}-color-rgb), var(--#{$prefix}#{$target}-opacity));
+  } @else {
+    @return rgba(var(--#{$prefix}#{$identifier}-rgb), var(--#{$prefix}#{$target}-opacity));
+  }
+}
+
+@function map-loop($map, $func, $args...) {
+  $_map: ();
+
+  @each $key, $value in $map {
+    // allow to pass the $key and $value of the map as an function argument
+    $_args: ();
+    @each $arg in $args {
+      $_args: append($_args, if($arg == "$key", $key, if($arg == "$value", $value, $arg)));
+    }
+
+    $_map: map-merge($_map, ($key: call(get-function($func), $_args...)));
+  }
+
+  @return $_map;
+}
+// stylelint-enable scss/dollar-variable-pattern
+
+@function varify($list) {
+  $result: null;
+  @each $entry in $list {
+    $result: append($result, var(--#{$prefix}#{$entry}), space);
+  }
+  @return $result;
+}
+
+// Internal Bootstrap function to turn maps into its negative variant.
+// It prefixes the keys with `n` and makes the value negative.
+@function negativify-map($map) {
+  $result: ();
+  @each $key, $value in $map {
+    @if $key != 0 {
+      $result: map-merge($result, ("n" + $key: (-$value)));
+    }
+  }
+  @return $result;
+}
+
+// Get multiple keys from a sass map
+@function map-get-multiple($map, $values) {
+  $result: ();
+  @each $key, $value in $map {
+    @if (index($values, $key) != null) {
+      $result: map-merge($result, ($key: $value));
+    }
+  }
+  @return $result;
+}
+
+// Merge multiple maps
+@function map-merge-multiple($maps...) {
+  $merged-maps: ();
+
+  @each $map in $maps {
+    $merged-maps: map-merge($merged-maps, $map);
+  }
+  @return $merged-maps;
+}
+
 // Replace `$search` with `$replace` in `$string`
 // Used on our SVG icon backgrounds for custom forms.
 //
-// @author Hugo Giraudel
+// @author Kitty Giraudel
 // @param {String} $string - Initial string
 // @param {String} $search - Substring to replace
 // @param {String} $replace ('') - New value
@@ -70,42 +144,80 @@
 }
 
 // Color contrast
-@function color-yiq($color, $dark: $yiq-text-dark, $light: $yiq-text-light) {
-  $r: red($color);
-  $g: green($color);
-  $b: blue($color);
+// See https://github.com/twbs/bootstrap/pull/30168
 
-  $yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
+// A list of pre-calculated numbers of pow(divide((divide($value, 255) + .055), 1.055), 2.4). (from 0 to 255)
+// stylelint-disable-next-line scss/dollar-variable-default, scss/dollar-variable-pattern
+$_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003 .0033 .0037 .004 .0044 .0048 .0052 .0056 .006 .0065 .007 .0075 .008 .0086 .0091 .0097 .0103 .011 .0116 .0123 .013 .0137 .0144 .0152 .016 .0168 .0176 .0185 .0194 .0203 .0212 .0222 .0232 .0242 .0252 .0262 .0273 .0284 .0296 .0307 .0319 .0331 .0343 .0356 .0369 .0382 .0395 .0409 .0423 .0437 .0452 .0467 .0482 .0497 .0513 .0529 .0545 .0561 .0578 .0595 .0612 .063 .0648 .0666 .0685 .0704 .0723 .0742 .0762 .0782 .0802 .0823 .0844 .0865 .0887 .0908 .0931 .0953 .0976 .0999 .1022 .1046 .107 .1095 .1119 .1144 .117 .1195 .1221 .1248 .1274 .1301 .1329 .1356 .1384 .1413 .1441 .147 .15 .1529 .1559 .159 .162 .1651 .1683 .1714 .1746 .1779 .1812 .1845 .1878 .1912 .1946 .1981 .2016 .2051 .2086 .2122 .2159 .2195 .2232 .227 .2307 .2346 .2384 .2423 .2462 .2502 .2542 .2582 .2623 .2664 .2705 .2747 .2789 .2831 .2874 .2918 .2961 .3005 .305 .3095 .314 .3185 .3231 .3278 .3325 .3372 .3419 .3467 .3515 .3564 .3613 .3663 .3712 .3763 .3813 .3864 .3916 .3968 .402 .4072 .4125 .4179 .4233 .4287 .4342 .4397 .4452 .4508 .4564 .4621 .4678 .4735 .4793 .4851 .491 .4969 .5029 .5089 .5149 .521 .5271 .5333 .5395 .5457 .552 .5583 .5647 .5711 .5776 .5841 .5906 .5972 .6038 .6105 .6172 .624 .6308 .6376 .6445 .6514 .6584 .6654 .6724 .6795 .6867 .6939 .7011 .7084 .7157 .7231 .7305 .7379 .7454 .7529 .7605 .7682 .7758 .7835 .7913 .7991 .807 .8148 .8228 .8308 .8388 .8469 .855 .8632 .8714 .8796 .8879 .8963 .9047 .9131 .9216 .9301 .9387 .9473 .956 .9647 .9734 .9823 .9911 1;
 
-  @if ($yiq >= $yiq-contrasted-threshold) {
-    @return $dark;
-  } @else {
-    @return $light;
+@function color-contrast($background, $color-contrast-dark: $color-contrast-dark, $color-contrast-light: $color-contrast-light, $min-contrast-ratio: $min-contrast-ratio) {
+  $foregrounds: $color-contrast-light, $color-contrast-dark, $white, $black;
+  $max-ratio: 0;
+  $max-ratio-color: null;
+
+  @each $color in $foregrounds {
+    $contrast-ratio: contrast-ratio($background, $color);
+    @if $contrast-ratio > $min-contrast-ratio {
+      @return $color;
+    } @else if $contrast-ratio > $max-ratio {
+      $max-ratio: $contrast-ratio;
+      $max-ratio-color: $color;
+    }
   }
+
+  @warn "Found no color leading to #{$min-contrast-ratio}:1 contrast ratio against #{$background}...";
+
+  @return $max-ratio-color;
 }
 
-// Retrieve color Sass maps
-@function color($key: "blue") {
-  @return map-get($colors, $key);
+@function contrast-ratio($background, $foreground: $color-contrast-light) {
+  $l1: luminance($background);
+  $l2: luminance(opaque($background, $foreground));
+
+  @return if($l1 > $l2, divide($l1 + .05, $l2 + .05), divide($l2 + .05, $l1 + .05));
 }
 
-@function theme-color($key: "primary") {
-  @return map-get($theme-colors, $key);
+// Return WCAG2.1 relative luminance
+// See https://www.w3.org/TR/WCAG/#dfn-relative-luminance
+// See https://www.w3.org/TR/WCAG/#dfn-contrast-ratio
+@function luminance($color) {
+  $rgb: (
+    "r": red($color),
+    "g": green($color),
+    "b": blue($color)
+  );
+
+  @each $name, $value in $rgb {
+    $value: if(divide($value, 255) < .04045, divide(divide($value, 255), 12.92), nth($_luminance-list, $value + 1));
+    $rgb: map-merge($rgb, ($name: $value));
+  }
+
+  @return (map-get($rgb, "r") * .2126) + (map-get($rgb, "g") * .7152) + (map-get($rgb, "b") * .0722);
 }
 
-@function gray($key: "100") {
-  @return map-get($grays, $key);
+// Return opaque color
+// opaque(#fff, rgba(0, 0, 0, .5)) => #808080
+@function opaque($background, $foreground) {
+  @return mix(rgba($foreground, 1), $background, opacity($foreground) * 100%);
 }
 
-// Request a theme color level
-@function theme-color-level($color-name: "primary", $level: 0) {
-  $color: theme-color($color-name);
-  $color-base: if($level > 0, $black, $white);
-  $level: abs($level);
+// scss-docs-start color-functions
+// Tint a color: mix a color with white
+@function tint-color($color, $weight) {
+  @return mix(white, $color, $weight);
+}
 
-  @return mix($color-base, $color, $level * $theme-color-interval);
+// Shade a color: mix a color with black
+@function shade-color($color, $weight) {
+  @return mix(black, $color, $weight);
 }
 
+// Shade the color if the weight is positive, else tint it
+@function shift-color($color, $weight) {
+  @return if($weight > 0, shade-color($color, $weight), tint-color($color, -$weight));
+}
+// scss-docs-end color-functions
+
 // Return valid calc
 @function add($value1, $value2, $return-calc: true) {
   @if $value1 == null {
@@ -140,5 +252,51 @@
     @return $value1 - $value2;
   }
 
+  @if type-of($value2) != number {
+    $value2: unquote("(") + $value2 + unquote(")");
+  }
+
   @return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
 }
+
+@function divide($dividend, $divisor, $precision: 10) {
+  $sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
+  $dividend: abs($dividend);
+  $divisor: abs($divisor);
+  @if $dividend == 0 {
+    @return 0;
+  }
+  @if $divisor == 0 {
+    @error "Cannot divide by 0";
+  }
+  $remainder: $dividend;
+  $result: 0;
+  $factor: 10;
+  @while ($remainder > 0 and $precision >= 0) {
+    $quotient: 0;
+    @while ($remainder >= $divisor) {
+      $remainder: $remainder - $divisor;
+      $quotient: $quotient + 1;
+    }
+    $result: $result * 10 + $quotient;
+    $factor: $factor * .1;
+    $remainder: $remainder * 10;
+    $precision: $precision - 1;
+    @if ($precision < 0 and $remainder >= $divisor * 5) {
+      $result: $result + 1;
+    }
+  }
+  $result: $result * $factor * $sign;
+  $dividend-unit: unit($dividend);
+  $divisor-unit: unit($divisor);
+  $unit-map: (
+    "px": 1px,
+    "rem": 1rem,
+    "em": 1em,
+    "%": 1%
+  );
+  @if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
+    $result: $result * map-get($unit-map, $dividend-unit);
+  }
+  @return $result;
+}
diff --git a/_sass/bootstrap/_grid.scss b/_sass/bootstrap/_grid.scss
index 0bfe5303b9..048f8009a3 100644
--- a/_sass/bootstrap/_grid.scss
+++ b/_sass/bootstrap/_grid.scss
@@ -1,69 +1,35 @@
-// Container widths
+// Row
 //
-// Set the container width, and override it for fixed navbars in media queries.
-
-@if $enable-grid-classes {
-  // Single container class with breakpoint max-widths
-  .container,
-  // 100% wide container at all breakpoints
-  .container-fluid {
-    @include make-container();
-  }
-
-  // Responsive containers that are 100% wide until a breakpoint
-  @each $breakpoint, $container-max-width in $container-max-widths {
-    .container-#{$breakpoint} {
-      @extend .container-fluid;
-    }
-
-    @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
-      %responsive-container-#{$breakpoint} {
-        max-width: $container-max-width;
-      }
-
-      // Extend each breakpoint which is smaller or equal to the current breakpoint
-      $extend-breakpoint: true;
-
-      @each $name, $width in $grid-breakpoints {
-        @if ($extend-breakpoint) {
-          .container#{breakpoint-infix($name, $grid-breakpoints)} {
-            @extend %responsive-container-#{$breakpoint};
-          }
+// Rows contain your columns.
 
-          // Once the current breakpoint is reached, stop extending
-          @if ($breakpoint == $name) {
-            $extend-breakpoint: false;
-          }
-        }
-      }
-    }
+:root {
+  @each $name, $value in $grid-breakpoints {
+    --#{$prefix}breakpoint-#{$name}: #{$value};
   }
 }
 
-
-// Row
-//
-// Rows contain your columns.
-
 @if $enable-grid-classes {
   .row {
     @include make-row();
+
+    > * {
+      @include make-col-ready();
+    }
   }
+}
 
-  // Remove the negative margin from default .row, then the horizontal padding
-  // from all immediate children columns (to prevent runaway style inheritance).
-  .no-gutters {
-    margin-right: 0;
-    margin-left: 0;
+@if $enable-cssgrid {
+  .grid {
+    display: grid;
+    grid-template-rows: repeat(var(--#{$prefix}rows, 1), 1fr);
+    grid-template-columns: repeat(var(--#{$prefix}columns, #{$grid-columns}), 1fr);
+    gap: var(--#{$prefix}gap, #{$grid-gutter-width});
 
-    > .col,
-    > [class*="col-"] {
-      padding-right: 0;
-      padding-left: 0;
-    }
+    @include make-cssgrid();
   }
 }
 
+
 // Columns
 //
 // Common styles for small and large grid columns
diff --git a/_sass/bootstrap/_helpers.scss b/_sass/bootstrap/_helpers.scss
new file mode 100644
index 0000000000..13f2752c9b
--- /dev/null
+++ b/_sass/bootstrap/_helpers.scss
@@ -0,0 +1,12 @@
+@import "helpers/clearfix";
+@import "helpers/color-bg";
+@import "helpers/colored-links";
+@import "helpers/focus-ring";
+@import "helpers/icon-link";
+@import "helpers/ratio";
+@import "helpers/position";
+@import "helpers/stacks";
+@import "helpers/visually-hidden";
+@import "helpers/stretched-link";
+@import "helpers/text-truncation";
+@import "helpers/vr";
diff --git a/_sass/bootstrap/_images.scss b/_sass/bootstrap/_images.scss
index b11b45a37b..3d6a1014c4 100644
--- a/_sass/bootstrap/_images.scss
+++ b/_sass/bootstrap/_images.scss
@@ -32,7 +32,7 @@
 }
 
 .figure-img {
-  margin-bottom: $spacer / 2;
+  margin-bottom: $spacer * .5;
   line-height: 1;
 }
 
diff --git a/_sass/bootstrap/_input-group.scss b/_sass/bootstrap/_input-group.scss
deleted file mode 100644
index d72ebeaba7..0000000000
--- a/_sass/bootstrap/_input-group.scss
+++ /dev/null
@@ -1,208 +0,0 @@
-// stylelint-disable selector-no-qualifying-type
-
-//
-// Base styles
-//
-
-.input-group {
-  position: relative;
-  display: flex;
-  flex-wrap: wrap; // For form validation feedback
-  align-items: stretch;
-  width: 100%;
-
-  > .form-control,
-  > .form-control-plaintext,
-  > .custom-select,
-  > .custom-file {
-    position: relative; // For focus state's z-index
-    flex: 1 1 auto;
-    width: 1%;
-    min-width: 0; // https://stackoverflow.com/questions/36247140/why-dont-flex-items-shrink-past-content-size
-    margin-bottom: 0;
-
-    + .form-control,
-    + .custom-select,
-    + .custom-file {
-      margin-left: -$input-border-width;
-    }
-  }
-
-  // Bring the "active" form control to the top of surrounding elements
-  > .form-control:focus,
-  > .custom-select:focus,
-  > .custom-file .custom-file-input:focus ~ .custom-file-label {
-    z-index: 3;
-  }
-
-  // Bring the custom file input above the label
-  > .custom-file .custom-file-input:focus {
-    z-index: 4;
-  }
-
-  > .form-control,
-  > .custom-select {
-    &:not(:first-child) { @include border-left-radius(0); }
-  }
-
-  // Custom file inputs have more complex markup, thus requiring different
-  // border-radius overrides.
-  > .custom-file {
-    display: flex;
-    align-items: center;
-
-    &:not(:last-child) .custom-file-label,
-    &:not(:first-child) .custom-file-label { @include border-left-radius(0); }
-  }
-
-  &:not(.has-validation) {
-    > .form-control:not(:last-child),
-    > .custom-select:not(:last-child),
-    > .custom-file:not(:last-child) .custom-file-label::after {
-      @include border-right-radius(0);
-    }
-  }
-
-  &.has-validation {
-    > .form-control:nth-last-child(n + 3),
-    > .custom-select:nth-last-child(n + 3),
-    > .custom-file:nth-last-child(n + 3) .custom-file-label::after {
-      @include border-right-radius(0);
-    }
-  }
-}
-
-
-// Prepend and append
-//
-// While it requires one extra layer of HTML for each, dedicated prepend and
-// append elements allow us to 1) be less clever, 2) simplify our selectors, and
-// 3) support HTML5 form validation.
-
-.input-group-prepend,
-.input-group-append {
-  display: flex;
-
-  // Ensure buttons are always above inputs for more visually pleasing borders.
-  // This isn't needed for `.input-group-text` since it shares the same border-color
-  // as our inputs.
-  .btn {
-    position: relative;
-    z-index: 2;
-
-    &:focus {
-      z-index: 3;
-    }
-  }
-
-  .btn + .btn,
-  .btn + .input-group-text,
-  .input-group-text + .input-group-text,
-  .input-group-text + .btn {
-    margin-left: -$input-border-width;
-  }
-}
-
-.input-group-prepend { margin-right: -$input-border-width; }
-.input-group-append { margin-left: -$input-border-width; }
-
-
-// Textual addons
-//
-// Serves as a catch-all element for any text or radio/checkbox input you wish
-// to prepend or append to an input.
-
-.input-group-text {
-  display: flex;
-  align-items: center;
-  padding: $input-padding-y $input-padding-x;
-  margin-bottom: 0; // Allow use of <label> elements by overriding our default margin-bottom
-  @include font-size($input-font-size); // Match inputs
-  font-weight: $font-weight-normal;
-  line-height: $input-line-height;
-  color: $input-group-addon-color;
-  text-align: center;
-  white-space: nowrap;
-  background-color: $input-group-addon-bg;
-  border: $input-border-width solid $input-group-addon-border-color;
-  @include border-radius($input-border-radius);
-
-  // Nuke default margins from checkboxes and radios to vertically center within.
-  input[type="radio"],
-  input[type="checkbox"] {
-    margin-top: 0;
-  }
-}
-
-
-// Sizing
-//
-// Remix the default form control sizing classes into new ones for easier
-// manipulation.
-
-.input-group-lg > .form-control:not(textarea),
-.input-group-lg > .custom-select {
-  height: $input-height-lg;
-}
-
-.input-group-lg > .form-control,
-.input-group-lg > .custom-select,
-.input-group-lg > .input-group-prepend > .input-group-text,
-.input-group-lg > .input-group-append > .input-group-text,
-.input-group-lg > .input-group-prepend > .btn,
-.input-group-lg > .input-group-append > .btn {
-  padding: $input-padding-y-lg $input-padding-x-lg;
-  @include font-size($input-font-size-lg);
-  line-height: $input-line-height-lg;
-  @include border-radius($input-border-radius-lg);
-}
-
-.input-group-sm > .form-control:not(textarea),
-.input-group-sm > .custom-select {
-  height: $input-height-sm;
-}
-
-.input-group-sm > .form-control,
-.input-group-sm > .custom-select,
-.input-group-sm > .input-group-prepend > .input-group-text,
-.input-group-sm > .input-group-append > .input-group-text,
-.input-group-sm > .input-group-prepend > .btn,
-.input-group-sm > .input-group-append > .btn {
-  padding: $input-padding-y-sm $input-padding-x-sm;
-  @include font-size($input-font-size-sm);
-  line-height: $input-line-height-sm;
-  @include border-radius($input-border-radius-sm);
-}
-
-.input-group-lg > .custom-select,
-.input-group-sm > .custom-select {
-  padding-right: $custom-select-padding-x + $custom-select-indicator-padding;
-}
-
-
-// Prepend and append rounded corners
-//
-// These rulesets must come after the sizing ones to properly override sm and lg
-// border-radius values when extending. They're more specific than we'd like
-// with the `.input-group >` part, but without it, we cannot override the sizing.
-
-
-.input-group > .input-group-prepend > .btn,
-.input-group > .input-group-prepend > .input-group-text,
-.input-group:not(.has-validation) > .input-group-append:not(:last-child) > .btn,
-.input-group:not(.has-validation) > .input-group-append:not(:last-child) > .input-group-text,
-.input-group.has-validation > .input-group-append:nth-last-child(n + 3) > .btn,
-.input-group.has-validation > .input-group-append:nth-last-child(n + 3) > .input-group-text,
-.input-group > .input-group-append:last-child > .btn:not(:last-child):not(.dropdown-toggle),
-.input-group > .input-group-append:last-child > .input-group-text:not(:last-child) {
-  @include border-right-radius(0);
-}
-
-.input-group > .input-group-append > .btn,
-.input-group > .input-group-append > .input-group-text,
-.input-group > .input-group-prepend:not(:first-child) > .btn,
-.input-group > .input-group-prepend:not(:first-child) > .input-group-text,
-.input-group > .input-group-prepend:first-child > .btn:not(:first-child),
-.input-group > .input-group-prepend:first-child > .input-group-text:not(:first-child) {
-  @include border-left-radius(0);
-}
diff --git a/_sass/bootstrap/_jumbotron.scss b/_sass/bootstrap/_jumbotron.scss
deleted file mode 100644
index bcd7dcad99..0000000000
--- a/_sass/bootstrap/_jumbotron.scss
+++ /dev/null
@@ -1,17 +0,0 @@
-.jumbotron {
-  padding: $jumbotron-padding ($jumbotron-padding / 2);
-  margin-bottom: $jumbotron-padding;
-  color: $jumbotron-color;
-  background-color: $jumbotron-bg;
-  @include border-radius($border-radius-lg);
-
-  @include media-breakpoint-up(sm) {
-    padding: ($jumbotron-padding * 2) $jumbotron-padding;
-  }
-}
-
-.jumbotron-fluid {
-  padding-right: 0;
-  padding-left: 0;
-  @include border-radius(0);
-}
diff --git a/_sass/bootstrap/_list-group.scss b/_sass/bootstrap/_list-group.scss
index ec25ba8a1f..455531eec0 100644
--- a/_sass/bootstrap/_list-group.scss
+++ b/_sass/bootstrap/_list-group.scss
@@ -3,15 +3,45 @@
 // Easily usable on <ul>, <ol>, or <div>.
 
 .list-group {
+  // scss-docs-start list-group-css-vars
+  --#{$prefix}list-group-color: #{$list-group-color};
+  --#{$prefix}list-group-bg: #{$list-group-bg};
+  --#{$prefix}list-group-border-color: #{$list-group-border-color};
+  --#{$prefix}list-group-border-width: #{$list-group-border-width};
+  --#{$prefix}list-group-border-radius: #{$list-group-border-radius};
+  --#{$prefix}list-group-item-padding-x: #{$list-group-item-padding-x};
+  --#{$prefix}list-group-item-padding-y: #{$list-group-item-padding-y};
+  --#{$prefix}list-group-action-color: #{$list-group-action-color};
+  --#{$prefix}list-group-action-hover-color: #{$list-group-action-hover-color};
+  --#{$prefix}list-group-action-hover-bg: #{$list-group-hover-bg};
+  --#{$prefix}list-group-action-active-color: #{$list-group-action-active-color};
+  --#{$prefix}list-group-action-active-bg: #{$list-group-action-active-bg};
+  --#{$prefix}list-group-disabled-color: #{$list-group-disabled-color};
+  --#{$prefix}list-group-disabled-bg: #{$list-group-disabled-bg};
+  --#{$prefix}list-group-active-color: #{$list-group-active-color};
+  --#{$prefix}list-group-active-bg: #{$list-group-active-bg};
+  --#{$prefix}list-group-active-border-color: #{$list-group-active-border-color};
+  // scss-docs-end list-group-css-vars
+
   display: flex;
   flex-direction: column;
 
   // No need to set list-style: none; since .list-group-item is block level
   padding-left: 0; // reset padding because ul and ol
   margin-bottom: 0;
-  @include border-radius($list-group-border-radius);
+  @include border-radius(var(--#{$prefix}list-group-border-radius));
 }
 
+.list-group-numbered {
+  list-style-type: none;
+  counter-reset: section;
+
+  > .list-group-item::before {
+    // Increments only this instance of the section counter
+    content: counters(section, ".") ". ";
+    counter-increment: section;
+  }
+}
 
 // Interactive list items
 //
@@ -20,24 +50,24 @@
 
 .list-group-item-action {
   width: 100%; // For `<button>`s (anchors become 100% by default though)
-  color: $list-group-action-color;
+  color: var(--#{$prefix}list-group-action-color);
   text-align: inherit; // For `<button>`s (anchors inherit)
 
   // Hover state
-  @include hover-focus() {
+  &:hover,
+  &:focus {
     z-index: 1; // Place hover/focus items above their siblings for proper border styling
-    color: $list-group-action-hover-color;
+    color: var(--#{$prefix}list-group-action-hover-color);
     text-decoration: none;
-    background-color: $list-group-hover-bg;
+    background-color: var(--#{$prefix}list-group-action-hover-bg);
   }
 
   &:active {
-    color: $list-group-action-active-color;
-    background-color: $list-group-action-active-bg;
+    color: var(--#{$prefix}list-group-action-active-color);
+    background-color: var(--#{$prefix}list-group-action-active-bg);
   }
 }
 
-
 // Individual list items
 //
 // Use on `li`s or `div`s within the `.list-group` parent.
@@ -45,11 +75,11 @@
 .list-group-item {
   position: relative;
   display: block;
-  padding: $list-group-item-padding-y $list-group-item-padding-x;
-  color: $list-group-color;
+  padding: var(--#{$prefix}list-group-item-padding-y) var(--#{$prefix}list-group-item-padding-x);
+  color: var(--#{$prefix}list-group-color);
   text-decoration: if($link-decoration == none, null, none);
-  background-color: $list-group-bg;
-  border: $list-group-border-width solid $list-group-border-color;
+  background-color: var(--#{$prefix}list-group-bg);
+  border: var(--#{$prefix}list-group-border-width) solid var(--#{$prefix}list-group-border-color);
 
   &:first-child {
     @include border-top-radius(inherit);
@@ -61,30 +91,30 @@
 
   &.disabled,
   &:disabled {
-    color: $list-group-disabled-color;
+    color: var(--#{$prefix}list-group-disabled-color);
     pointer-events: none;
-    background-color: $list-group-disabled-bg;
+    background-color: var(--#{$prefix}list-group-disabled-bg);
   }
 
   // Include both here for `<a>`s and `<button>`s
   &.active {
     z-index: 2; // Place active items above their siblings for proper border styling
-    color: $list-group-active-color;
-    background-color: $list-group-active-bg;
-    border-color: $list-group-active-border-color;
+    color: var(--#{$prefix}list-group-active-color);
+    background-color: var(--#{$prefix}list-group-active-bg);
+    border-color: var(--#{$prefix}list-group-active-border-color);
   }
 
-  & + & {
+  // stylelint-disable-next-line scss/selector-no-redundant-nesting-selector
+  & + .list-group-item {
     border-top-width: 0;
 
     &.active {
-      margin-top: -$list-group-border-width;
-      border-top-width: $list-group-border-width;
+      margin-top: calc(-1 * var(--#{$prefix}list-group-border-width)); // stylelint-disable-line function-disallowed-list
+      border-top-width: var(--#{$prefix}list-group-border-width);
     }
   }
 }
 
-
 // Horizontal
 //
 // Change the layout of list group items from vertical (default) to horizontal.
@@ -97,14 +127,14 @@
       flex-direction: row;
 
       > .list-group-item {
-        &:first-child {
-          @include border-bottom-left-radius($list-group-border-radius);
-          @include border-top-right-radius(0);
+        &:first-child:not(:last-child) {
+          @include border-bottom-start-radius(var(--#{$prefix}list-group-border-radius));
+          @include border-top-end-radius(0);
         }
 
-        &:last-child {
-          @include border-top-right-radius($list-group-border-radius);
-          @include border-bottom-left-radius(0);
+        &:last-child:not(:first-child) {
+          @include border-top-end-radius(var(--#{$prefix}list-group-border-radius));
+          @include border-bottom-start-radius(0);
         }
 
         &.active {
@@ -112,12 +142,12 @@
         }
 
         + .list-group-item {
-          border-top-width: $list-group-border-width;
+          border-top-width: var(--#{$prefix}list-group-border-width);
           border-left-width: 0;
 
           &.active {
-            margin-left: -$list-group-border-width;
-            border-left-width: $list-group-border-width;
+            margin-left: calc(-1 * var(--#{$prefix}list-group-border-width)); // stylelint-disable-line function-disallowed-list
+            border-left-width: var(--#{$prefix}list-group-border-width);
           }
         }
       }
@@ -135,7 +165,7 @@
   @include border-radius(0);
 
   > .list-group-item {
-    border-width: 0 0 $list-group-border-width;
+    border-width: 0 0 var(--#{$prefix}list-group-border-width);
 
     &:last-child {
       border-bottom-width: 0;
@@ -144,11 +174,24 @@
 }
 
 
-// Contextual variants
+// scss-docs-start list-group-modifiers
+// List group contextual variants
 //
 // Add modifier classes to change text and background color on individual items.
 // Organizationally, this must come after the `:hover` states.
 
-@each $color, $value in $theme-colors {
-  @include list-group-item-variant($color, theme-color-level($color, -9), theme-color-level($color, 6));
+@each $state in map-keys($theme-colors) {
+  .list-group-item-#{$state} {
+    --#{$prefix}list-group-color: var(--#{$prefix}#{$state}-text-emphasis);
+    --#{$prefix}list-group-bg: var(--#{$prefix}#{$state}-bg-subtle);
+    --#{$prefix}list-group-border-color: var(--#{$prefix}#{$state}-border-subtle);
+    --#{$prefix}list-group-action-hover-color: var(--#{$prefix}emphasis-color);
+    --#{$prefix}list-group-action-hover-bg: var(--#{$prefix}#{$state}-border-subtle);
+    --#{$prefix}list-group-action-active-color: var(--#{$prefix}emphasis-color);
+    --#{$prefix}list-group-action-active-bg: var(--#{$prefix}#{$state}-border-subtle);
+    --#{$prefix}list-group-active-color: var(--#{$prefix}#{$state}-bg-subtle);
+    --#{$prefix}list-group-active-bg: var(--#{$prefix}#{$state}-text-emphasis);
+    --#{$prefix}list-group-active-border-color: var(--#{$prefix}#{$state}-text-emphasis);
+  }
 }
+// scss-docs-end list-group-modifiers
diff --git a/_sass/bootstrap/_maps.scss b/_sass/bootstrap/_maps.scss
new file mode 100644
index 0000000000..68ee421c2b
--- /dev/null
+++ b/_sass/bootstrap/_maps.scss
@@ -0,0 +1,174 @@
+// Re-assigned maps
+//
+// Placed here so that others can override the default Sass maps and see automatic updates to utilities and more.
+
+// scss-docs-start theme-colors-rgb
+$theme-colors-rgb: map-loop($theme-colors, to-rgb, "$value") !default;
+// scss-docs-end theme-colors-rgb
+
+// scss-docs-start theme-text-map
+$theme-colors-text: (
+  "primary": $primary-text-emphasis,
+  "secondary": $secondary-text-emphasis,
+  "success": $success-text-emphasis,
+  "info": $info-text-emphasis,
+  "warning": $warning-text-emphasis,
+  "danger": $danger-text-emphasis,
+  "light": $light-text-emphasis,
+  "dark": $dark-text-emphasis,
+) !default;
+// scss-docs-end theme-text-map
+
+// scss-docs-start theme-bg-subtle-map
+$theme-colors-bg-subtle: (
+  "primary": $primary-bg-subtle,
+  "secondary": $secondary-bg-subtle,
+  "success": $success-bg-subtle,
+  "info": $info-bg-subtle,
+  "warning": $warning-bg-subtle,
+  "danger": $danger-bg-subtle,
+  "light": $light-bg-subtle,
+  "dark": $dark-bg-subtle,
+) !default;
+// scss-docs-end theme-bg-subtle-map
+
+// scss-docs-start theme-border-subtle-map
+$theme-colors-border-subtle: (
+  "primary": $primary-border-subtle,
+  "secondary": $secondary-border-subtle,
+  "success": $success-border-subtle,
+  "info": $info-border-subtle,
+  "warning": $warning-border-subtle,
+  "danger": $danger-border-subtle,
+  "light": $light-border-subtle,
+  "dark": $dark-border-subtle,
+) !default;
+// scss-docs-end theme-border-subtle-map
+
+$theme-colors-text-dark: null !default;
+$theme-colors-bg-subtle-dark: null !default;
+$theme-colors-border-subtle-dark: null !default;
+
+@if $enable-dark-mode {
+  // scss-docs-start theme-text-dark-map
+  $theme-colors-text-dark: (
+    "primary": $primary-text-emphasis-dark,
+    "secondary": $secondary-text-emphasis-dark,
+    "success": $success-text-emphasis-dark,
+    "info": $info-text-emphasis-dark,
+    "warning": $warning-text-emphasis-dark,
+    "danger": $danger-text-emphasis-dark,
+    "light": $light-text-emphasis-dark,
+    "dark": $dark-text-emphasis-dark,
+  ) !default;
+  // scss-docs-end theme-text-dark-map
+
+  // scss-docs-start theme-bg-subtle-dark-map
+  $theme-colors-bg-subtle-dark: (
+    "primary": $primary-bg-subtle-dark,
+    "secondary": $secondary-bg-subtle-dark,
+    "success": $success-bg-subtle-dark,
+    "info": $info-bg-subtle-dark,
+    "warning": $warning-bg-subtle-dark,
+    "danger": $danger-bg-subtle-dark,
+    "light": $light-bg-subtle-dark,
+    "dark": $dark-bg-subtle-dark,
+  ) !default;
+  // scss-docs-end theme-bg-subtle-dark-map
+
+  // scss-docs-start theme-border-subtle-dark-map
+  $theme-colors-border-subtle-dark: (
+    "primary": $primary-border-subtle-dark,
+    "secondary": $secondary-border-subtle-dark,
+    "success": $success-border-subtle-dark,
+    "info": $info-border-subtle-dark,
+    "warning": $warning-border-subtle-dark,
+    "danger": $danger-border-subtle-dark,
+    "light": $light-border-subtle-dark,
+    "dark": $dark-border-subtle-dark,
+  ) !default;
+  // scss-docs-end theme-border-subtle-dark-map
+}
+
+// Utilities maps
+//
+// Extends the default `$theme-colors` maps to help create our utilities.
+
+// Come v6, we'll de-dupe these variables. Until then, for backward compatibility, we keep them to reassign.
+// scss-docs-start utilities-colors
+$utilities-colors: $theme-colors-rgb !default;
+// scss-docs-end utilities-colors
+
+// scss-docs-start utilities-text-colors
+$utilities-text: map-merge(
+  $utilities-colors,
+  (
+    "black": to-rgb($black),
+    "white": to-rgb($white),
+    "body": to-rgb($body-color)
+  )
+) !default;
+$utilities-text-colors: map-loop($utilities-text, rgba-css-var, "$key", "text") !default;
+
+$utilities-text-emphasis-colors: (
+  "primary-emphasis": var(--#{$prefix}primary-text-emphasis),
+  "secondary-emphasis": var(--#{$prefix}secondary-text-emphasis),
+  "success-emphasis": var(--#{$prefix}success-text-emphasis),
+  "info-emphasis": var(--#{$prefix}info-text-emphasis),
+  "warning-emphasis": var(--#{$prefix}warning-text-emphasis),
+  "danger-emphasis": var(--#{$prefix}danger-text-emphasis),
+  "light-emphasis": var(--#{$prefix}light-text-emphasis),
+  "dark-emphasis": var(--#{$prefix}dark-text-emphasis)
+) !default;
+// scss-docs-end utilities-text-colors
+
+// scss-docs-start utilities-bg-colors
+$utilities-bg: map-merge(
+  $utilities-colors,
+  (
+    "black": to-rgb($black),
+    "white": to-rgb($white),
+    "body": to-rgb($body-bg)
+  )
+) !default;
+$utilities-bg-colors: map-loop($utilities-bg, rgba-css-var, "$key", "bg") !default;
+
+$utilities-bg-subtle: (
+  "primary-subtle": var(--#{$prefix}primary-bg-subtle),
+  "secondary-subtle": var(--#{$prefix}secondary-bg-subtle),
+  "success-subtle": var(--#{$prefix}success-bg-subtle),
+  "info-subtle": var(--#{$prefix}info-bg-subtle),
+  "warning-subtle": var(--#{$prefix}warning-bg-subtle),
+  "danger-subtle": var(--#{$prefix}danger-bg-subtle),
+  "light-subtle": var(--#{$prefix}light-bg-subtle),
+  "dark-subtle": var(--#{$prefix}dark-bg-subtle)
+) !default;
+// scss-docs-end utilities-bg-colors
+
+// scss-docs-start utilities-border-colors
+$utilities-border: map-merge(
+  $utilities-colors,
+  (
+    "black": to-rgb($black),
+    "white": to-rgb($white)
+  )
+) !default;
+$utilities-border-colors: map-loop($utilities-border, rgba-css-var, "$key", "border") !default;
+
+$utilities-border-subtle: (
+  "primary-subtle": var(--#{$prefix}primary-border-subtle),
+  "secondary-subtle": var(--#{$prefix}secondary-border-subtle),
+  "success-subtle": var(--#{$prefix}success-border-subtle),
+  "info-subtle": var(--#{$prefix}info-border-subtle),
+  "warning-subtle": var(--#{$prefix}warning-border-subtle),
+  "danger-subtle": var(--#{$prefix}danger-border-subtle),
+  "light-subtle": var(--#{$prefix}light-border-subtle),
+  "dark-subtle": var(--#{$prefix}dark-border-subtle)
+) !default;
+// scss-docs-end utilities-border-colors
+
+$utilities-links-underline: map-loop($utilities-colors, rgba-css-var, "$key", "link-underline") !default;
+
+$negative-spacers: if($enable-negative-margins, negativify-map($spacers), null) !default;
+
+$gutters: $spacers !default;
diff --git a/_sass/bootstrap/_media.scss b/_sass/bootstrap/_media.scss
deleted file mode 100644
index b573052c14..0000000000
--- a/_sass/bootstrap/_media.scss
+++ /dev/null
@@ -1,8 +0,0 @@
-.media {
-  display: flex;
-  align-items: flex-start;
-}
-
-.media-body {
-  flex: 1;
-}
diff --git a/_sass/bootstrap/_mixins.scss b/_sass/bootstrap/_mixins.scss
index 7e7a23d254..e1e130b164 100644
--- a/_sass/bootstrap/_mixins.scss
+++ b/_sass/bootstrap/_mixins.scss
@@ -8,33 +8,29 @@
 // Deprecate
 @import "mixins/deprecate";
 
-// Utilities
+// Helpers
 @import "mixins/breakpoints";
-@import "mixins/hover";
+@import "mixins/color-mode";
+@import "mixins/color-scheme";
 @import "mixins/image";
-@import "mixins/badge";
 @import "mixins/resize";
-@import "mixins/screen-reader";
-@import "mixins/size";
+@import "mixins/visually-hidden";
 @import "mixins/reset-text";
-@import "mixins/text-emphasis";
-@import "mixins/text-hide";
 @import "mixins/text-truncate";
-@import "mixins/visibility";
+
+// Utilities
+@import "mixins/utilities";
 
 // Components
-@import "mixins/alert";
+@import "mixins/backdrop";
 @import "mixins/buttons";
 @import "mixins/caret";
 @import "mixins/pagination";
 @import "mixins/lists";
-@import "mixins/list-group";
-@import "mixins/nav-divider";
 @import "mixins/forms";
-@import "mixins/table-row";
+@import "mixins/table-variants";
 
 // Skins
-@import "mixins/background-variant";
 @import "mixins/border-radius";
 @import "mixins/box-shadow";
 @import "mixins/gradients";
@@ -42,6 +38,5 @@
 
 // Layout
 @import "mixins/clearfix";
-@import "mixins/grid-framework";
+@import "mixins/container";
 @import "mixins/grid";
-@import "mixins/float";
diff --git a/_sass/bootstrap/_modal.scss b/_sass/bootstrap/_modal.scss
index e43c70fbb4..5f1429fe4b 100644
--- a/_sass/bootstrap/_modal.scss
+++ b/_sass/bootstrap/_modal.scss
@@ -1,29 +1,46 @@
+// stylelint-disable function-disallowed-list
+
 // .modal-open      - body class for killing the scroll
 // .modal           - container to scroll within
 // .modal-dialog    - positioning shell for the actual modal
 // .modal-content   - actual modal w/ bg and corners and stuff
 
 
-.modal-open {
-  // Kill the scroll on the body
-  overflow: hidden;
-
-  .modal {
-    overflow-x: hidden;
-    overflow-y: auto;
-  }
-}
-
 // Container that the modal scrolls within
 .modal {
+  // scss-docs-start modal-css-vars
+  --#{$prefix}modal-zindex: #{$zindex-modal};
+  --#{$prefix}modal-width: #{$modal-md};
+  --#{$prefix}modal-padding: #{$modal-inner-padding};
+  --#{$prefix}modal-margin: #{$modal-dialog-margin};
+  --#{$prefix}modal-color: #{$modal-content-color};
+  --#{$prefix}modal-bg: #{$modal-content-bg};
+  --#{$prefix}modal-border-color: #{$modal-content-border-color};
+  --#{$prefix}modal-border-width: #{$modal-content-border-width};
+  --#{$prefix}modal-border-radius: #{$modal-content-border-radius};
+  --#{$prefix}modal-box-shadow: #{$modal-content-box-shadow-xs};
+  --#{$prefix}modal-inner-border-radius: #{$modal-content-inner-border-radius};
+  --#{$prefix}modal-header-padding-x: #{$modal-header-padding-x};
+  --#{$prefix}modal-header-padding-y: #{$modal-header-padding-y};
+  --#{$prefix}modal-header-padding: #{$modal-header-padding}; // Todo in v6: Split this padding into x and y
+  --#{$prefix}modal-header-border-color: #{$modal-header-border-color};
+  --#{$prefix}modal-header-border-width: #{$modal-header-border-width};
+  --#{$prefix}modal-title-line-height: #{$modal-title-line-height};
+  --#{$prefix}modal-footer-gap: #{$modal-footer-margin-between};
+  --#{$prefix}modal-footer-bg: #{$modal-footer-bg};
+  --#{$prefix}modal-footer-border-color: #{$modal-footer-border-color};
+  --#{$prefix}modal-footer-border-width: #{$modal-footer-border-width};
+  // scss-docs-end modal-css-vars
+
   position: fixed;
   top: 0;
   left: 0;
-  z-index: $zindex-modal;
+  z-index: var(--#{$prefix}modal-zindex);
   display: none;
   width: 100%;
   height: 100%;
-  overflow: hidden;
+  overflow-x: hidden;
+  overflow-y: auto;
   // Prevent Chrome on Windows from adding a focus outline. For details, see
   // https://github.com/twbs/bootstrap/pull/10951.
   outline: 0;
@@ -36,7 +53,7 @@
 .modal-dialog {
   position: relative;
   width: auto;
-  margin: $modal-dialog-margin;
+  margin: var(--#{$prefix}modal-margin);
   // allow clicks to pass through for custom click handling to close modal
   pointer-events: none;
 
@@ -56,19 +73,13 @@
 }
 
 .modal-dialog-scrollable {
-  display: flex; // IE10/11
-  max-height: subtract(100%, $modal-dialog-margin * 2);
+  height: calc(100% - var(--#{$prefix}modal-margin) * 2);
 
   .modal-content {
-    max-height: subtract(100vh, $modal-dialog-margin * 2); // IE10/11
+    max-height: 100%;
     overflow: hidden;
   }
 
-  .modal-header,
-  .modal-footer {
-    flex-shrink: 0;
-  }
-
   .modal-body {
     overflow-y: auto;
   }
@@ -77,30 +88,7 @@
 .modal-dialog-centered {
   display: flex;
   align-items: center;
-  min-height: subtract(100%, $modal-dialog-margin * 2);
-
-  // Ensure `modal-dialog-centered` extends the full height of the view (IE10/11)
-  &::before {
-    display: block; // IE10
-    height: subtract(100vh, $modal-dialog-margin * 2);
-    height: min-content; // Reset height to 0 except on IE
-    content: "";
-  }
-
-  // Ensure `.modal-body` shows scrollbar (IE10/11)
-  &.modal-dialog-scrollable {
-    flex-direction: column;
-    justify-content: center;
-    height: 100%;
-
-    .modal-content {
-      max-height: none;
-    }
-
-    &::before {
-      content: none;
-    }
-  }
+  min-height: calc(100% - var(--#{$prefix}modal-margin) * 2);
 }
 
 // Actual modal
@@ -110,53 +98,49 @@
   flex-direction: column;
   width: 100%; // Ensure `.modal-content` extends the full width of the parent `.modal-dialog`
   // counteract the pointer-events: none; in the .modal-dialog
-  color: $modal-content-color;
+  color: var(--#{$prefix}modal-color);
   pointer-events: auto;
-  background-color: $modal-content-bg;
+  background-color: var(--#{$prefix}modal-bg);
   background-clip: padding-box;
-  border: $modal-content-border-width solid $modal-content-border-color;
-  @include border-radius($modal-content-border-radius);
-  @include box-shadow($modal-content-box-shadow-xs);
+  border: var(--#{$prefix}modal-border-width) solid var(--#{$prefix}modal-border-color);
+  @include border-radius(var(--#{$prefix}modal-border-radius));
+  @include box-shadow(var(--#{$prefix}modal-box-shadow));
   // Remove focus outline from opened modal
   outline: 0;
 }
 
 // Modal background
 .modal-backdrop {
-  position: fixed;
-  top: 0;
-  left: 0;
-  z-index: $zindex-modal-backdrop;
-  width: 100vw;
-  height: 100vh;
-  background-color: $modal-backdrop-bg;
-
-  // Fade for backdrop
-  &.fade { opacity: 0; }
-  &.show { opacity: $modal-backdrop-opacity; }
+  // scss-docs-start modal-backdrop-css-vars
+  --#{$prefix}backdrop-zindex: #{$zindex-modal-backdrop};
+  --#{$prefix}backdrop-bg: #{$modal-backdrop-bg};
+  --#{$prefix}backdrop-opacity: #{$modal-backdrop-opacity};
+  // scss-docs-end modal-backdrop-css-vars
+
+  @include overlay-backdrop(var(--#{$prefix}backdrop-zindex), var(--#{$prefix}backdrop-bg), var(--#{$prefix}backdrop-opacity));
 }
 
 // Modal header
 // Top section of the modal w/ title and dismiss
 .modal-header {
   display: flex;
-  align-items: flex-start; // so the close btn always stays on the upper right corner
+  flex-shrink: 0;
+  align-items: center;
   justify-content: space-between; // Put modal header elements (title and dismiss) on opposite ends
-  padding: $modal-header-padding;
-  border-bottom: $modal-header-border-width solid $modal-header-border-color;
-  @include border-top-radius($modal-content-inner-border-radius);
-
-  .close {
-    padding: $modal-header-padding;
-    // auto on the left force icon to the right even when there is no .modal-title
-    margin: (-$modal-header-padding-y) (-$modal-header-padding-x) (-$modal-header-padding-y) auto;
+  padding: var(--#{$prefix}modal-header-padding);
+  border-bottom: var(--#{$prefix}modal-header-border-width) solid var(--#{$prefix}modal-header-border-color);
+  @include border-top-radius(var(--#{$prefix}modal-inner-border-radius));
+
+  .btn-close {
+    padding: calc(var(--#{$prefix}modal-header-padding-y) * .5) calc(var(--#{$prefix}modal-header-padding-x) * .5);
+    margin: calc(-.5 * var(--#{$prefix}modal-header-padding-y)) calc(-.5 * var(--#{$prefix}modal-header-padding-x)) calc(-.5 * var(--#{$prefix}modal-header-padding-y)) auto;
   }
 }
 
 // Title text within header
 .modal-title {
   margin-bottom: 0;
-  line-height: $modal-title-line-height;
+  line-height: var(--#{$prefix}modal-title-line-height);
 }
 
 // Modal body
@@ -166,75 +150,88 @@
   // Enable `flex-grow: 1` so that the body take up as much space as possible
   // when there should be a fixed height on `.modal-dialog`.
   flex: 1 1 auto;
-  padding: $modal-inner-padding;
+  padding: var(--#{$prefix}modal-padding);
 }
 
 // Footer (for actions)
 .modal-footer {
   display: flex;
+  flex-shrink: 0;
   flex-wrap: wrap;
   align-items: center; // vertically center
   justify-content: flex-end; // Right align buttons with flex property because text-align doesn't work on flex items
-  padding: $modal-inner-padding - $modal-footer-margin-between / 2;
-  border-top: $modal-footer-border-width solid $modal-footer-border-color;
-  @include border-bottom-radius($modal-content-inner-border-radius);
+  padding: calc(var(--#{$prefix}modal-padding) - var(--#{$prefix}modal-footer-gap) * .5);
+  background-color: var(--#{$prefix}modal-footer-bg);
+  border-top: var(--#{$prefix}modal-footer-border-width) solid var(--#{$prefix}modal-footer-border-color);
+  @include border-bottom-radius(var(--#{$prefix}modal-inner-border-radius));
 
   // Place margin between footer elements
   // This solution is far from ideal because of the universal selector usage,
   // but is needed to fix https://github.com/twbs/bootstrap/issues/24800
   > * {
-    margin: $modal-footer-margin-between / 2;
+    margin: calc(var(--#{$prefix}modal-footer-gap) * .5); // Todo in v6: replace with gap on parent class
   }
 }
 
-// Measure scrollbar width for padding body during modal show/hide
-.modal-scrollbar-measure {
-  position: absolute;
-  top: -9999px;
-  width: 50px;
-  height: 50px;
-  overflow: scroll;
-}
-
 // Scale up the modal
 @include media-breakpoint-up(sm) {
-  // Automatically set modal's width for larger viewports
-  .modal-dialog {
-    max-width: $modal-md;
-    margin: $modal-dialog-margin-y-sm-up auto;
-  }
-
-  .modal-dialog-scrollable {
-    max-height: subtract(100%, $modal-dialog-margin-y-sm-up * 2);
-
-    .modal-content {
-      max-height: subtract(100vh, $modal-dialog-margin-y-sm-up * 2);
-    }
+  .modal {
+    --#{$prefix}modal-margin: #{$modal-dialog-margin-y-sm-up};
+    --#{$prefix}modal-box-shadow: #{$modal-content-box-shadow-sm-up};
   }
 
-  .modal-dialog-centered {
-    min-height: subtract(100%, $modal-dialog-margin-y-sm-up * 2);
-
-    &::before {
-      height: subtract(100vh, $modal-dialog-margin-y-sm-up * 2);
-      height: min-content;
-    }
+  // Automatically set modal's width for larger viewports
+  .modal-dialog {
+    max-width: var(--#{$prefix}modal-width);
+    margin-right: auto;
+    margin-left: auto;
   }
 
-  .modal-content {
-    @include box-shadow($modal-content-box-shadow-sm-up);
+  .modal-sm {
+    --#{$prefix}modal-width: #{$modal-sm};
   }
-
-  .modal-sm { max-width: $modal-sm; }
 }
 
 @include media-breakpoint-up(lg) {
   .modal-lg,
   .modal-xl {
-    max-width: $modal-lg;
+    --#{$prefix}modal-width: #{$modal-lg};
   }
 }
 
 @include media-breakpoint-up(xl) {
-  .modal-xl { max-width: $modal-xl; }
+  .modal-xl {
+    --#{$prefix}modal-width: #{$modal-xl};
+  }
+}
+
+// scss-docs-start modal-fullscreen-loop
+@each $breakpoint in map-keys($grid-breakpoints) {
+  $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+  $postfix: if($infix != "", $infix + "-down", "");
+
+  @include media-breakpoint-down($breakpoint) {
+    .modal-fullscreen#{$postfix} {
+      width: 100vw;
+      max-width: none;
+      height: 100%;
+      margin: 0;
+
+      .modal-content {
+        height: 100%;
+        border: 0;
+        @include border-radius(0);
+      }
+
+      .modal-header,
+      .modal-footer {
+        @include border-radius(0);
+      }
+
+      .modal-body {
+        overflow-y: auto;
+      }
+    }
+  }
 }
+// scss-docs-end modal-fullscreen-loop
diff --git a/_sass/bootstrap/_nav.scss b/_sass/bootstrap/_nav.scss
index fad684e57b..ff073d3619 100644
--- a/_sass/bootstrap/_nav.scss
+++ b/_sass/bootstrap/_nav.scss
@@ -4,6 +4,16 @@
 // `<nav>`s, `<ul>`s or `<ol>`s.
 
 .nav {
+  // scss-docs-start nav-css-vars
+  --#{$prefix}nav-link-padding-x: #{$nav-link-padding-x};
+  --#{$prefix}nav-link-padding-y: #{$nav-link-padding-y};
+  @include rfs($nav-link-font-size, --#{$prefix}nav-link-font-size);
+  --#{$prefix}nav-link-font-weight: #{$nav-link-font-weight};
+  --#{$prefix}nav-link-color: #{$nav-link-color};
+  --#{$prefix}nav-link-hover-color: #{$nav-link-hover-color};
+  --#{$prefix}nav-link-disabled-color: #{$nav-link-disabled-color};
+  // scss-docs-end nav-css-vars
+
   display: flex;
   flex-wrap: wrap;
   padding-left: 0;
@@ -13,16 +23,30 @@
 
 .nav-link {
   display: block;
-  padding: $nav-link-padding-y $nav-link-padding-x;
+  padding: var(--#{$prefix}nav-link-padding-y) var(--#{$prefix}nav-link-padding-x);
+  @include font-size(var(--#{$prefix}nav-link-font-size));
+  font-weight: var(--#{$prefix}nav-link-font-weight);
+  color: var(--#{$prefix}nav-link-color);
   text-decoration: if($link-decoration == none, null, none);
+  background: none;
+  border: 0;
+  @include transition($nav-link-transition);
+
+  &:hover,
+  &:focus {
+    color: var(--#{$prefix}nav-link-hover-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
+  }
 
-  @include hover-focus() {
-    text-decoration: none;
+  &:focus-visible {
+    outline: 0;
+    box-shadow: $nav-link-focus-box-shadow;
   }
 
   // Disabled state lightens text
-  &.disabled {
-    color: $nav-link-disabled-color;
+  &.disabled,
+  &:disabled {
+    color: var(--#{$prefix}nav-link-disabled-color);
     pointer-events: none;
     cursor: default;
   }
@@ -33,34 +57,41 @@
 //
 
 .nav-tabs {
-  border-bottom: $nav-tabs-border-width solid $nav-tabs-border-color;
+  // scss-docs-start nav-tabs-css-vars
+  --#{$prefix}nav-tabs-border-width: #{$nav-tabs-border-width};
+  --#{$prefix}nav-tabs-border-color: #{$nav-tabs-border-color};
+  --#{$prefix}nav-tabs-border-radius: #{$nav-tabs-border-radius};
+  --#{$prefix}nav-tabs-link-hover-border-color: #{$nav-tabs-link-hover-border-color};
+  --#{$prefix}nav-tabs-link-active-color: #{$nav-tabs-link-active-color};
+  --#{$prefix}nav-tabs-link-active-bg: #{$nav-tabs-link-active-bg};
+  --#{$prefix}nav-tabs-link-active-border-color: #{$nav-tabs-link-active-border-color};
+  // scss-docs-end nav-tabs-css-vars
+
+  border-bottom: var(--#{$prefix}nav-tabs-border-width) solid var(--#{$prefix}nav-tabs-border-color);
 
   .nav-link {
-    margin-bottom: -$nav-tabs-border-width;
-    border: $nav-tabs-border-width solid transparent;
-    @include border-top-radius($nav-tabs-border-radius);
-
-    @include hover-focus() {
-      border-color: $nav-tabs-link-hover-border-color;
-    }
-
-    &.disabled {
-      color: $nav-link-disabled-color;
-      background-color: transparent;
-      border-color: transparent;
+    margin-bottom: calc(-1 * var(--#{$prefix}nav-tabs-border-width)); // stylelint-disable-line function-disallowed-list
+    border: var(--#{$prefix}nav-tabs-border-width) solid transparent;
+    @include border-top-radius(var(--#{$prefix}nav-tabs-border-radius));
+
+    &:hover,
+    &:focus {
+      // Prevents active .nav-link tab overlapping focus outline of previous/next .nav-link
+      isolation: isolate;
+      border-color: var(--#{$prefix}nav-tabs-link-hover-border-color);
     }
   }
 
   .nav-link.active,
   .nav-item.show .nav-link {
-    color: $nav-tabs-link-active-color;
-    background-color: $nav-tabs-link-active-bg;
-    border-color: $nav-tabs-link-active-border-color;
+    color: var(--#{$prefix}nav-tabs-link-active-color);
+    background-color: var(--#{$prefix}nav-tabs-link-active-bg);
+    border-color: var(--#{$prefix}nav-tabs-link-active-border-color);
   }
 
   .dropdown-menu {
     // Make dropdown border overlap tab border
-    margin-top: -$nav-tabs-border-width;
+    margin-top: calc(-1 * var(--#{$prefix}nav-tabs-border-width)); // stylelint-disable-line function-disallowed-list
     // Remove the top rounded corners here since there is a hard edge above the menu
     @include border-top-radius(0);
   }
@@ -72,14 +103,53 @@
 //
 
 .nav-pills {
+  // scss-docs-start nav-pills-css-vars
+  --#{$prefix}nav-pills-border-radius: #{$nav-pills-border-radius};
+  --#{$prefix}nav-pills-link-active-color: #{$nav-pills-link-active-color};
+  --#{$prefix}nav-pills-link-active-bg: #{$nav-pills-link-active-bg};
+  // scss-docs-end nav-pills-css-vars
+
+  .nav-link {
+    @include border-radius(var(--#{$prefix}nav-pills-border-radius));
+  }
+
+  .nav-link.active,
+  .show > .nav-link {
+    color: var(--#{$prefix}nav-pills-link-active-color);
+    @include gradient-bg(var(--#{$prefix}nav-pills-link-active-bg));
+  }
+}
+
+
+//
+// Underline
+//
+
+.nav-underline {
+  // scss-docs-start nav-underline-css-vars
+  --#{$prefix}nav-underline-gap: #{$nav-underline-gap};
+  --#{$prefix}nav-underline-border-width: #{$nav-underline-border-width};
+  --#{$prefix}nav-underline-link-active-color: #{$nav-underline-link-active-color};
+  // scss-docs-end nav-underline-css-vars
+
+  gap: var(--#{$prefix}nav-underline-gap);
+
   .nav-link {
-    @include border-radius($nav-pills-border-radius);
+    padding-right: 0;
+    padding-left: 0;
+    border-bottom: var(--#{$prefix}nav-underline-border-width) solid transparent;
+
+    &:hover,
+    &:focus {
+      border-bottom-color: currentcolor;
+    }
   }
 
   .nav-link.active,
   .show > .nav-link {
-    color: $nav-pills-link-active-color;
-    background-color: $nav-pills-link-active-bg;
+    font-weight: $font-weight-bold;
+    color: var(--#{$prefix}nav-underline-link-active-color);
+    border-bottom-color: currentcolor;
   }
 }
 
@@ -105,6 +175,13 @@
   }
 }
 
+.nav-fill,
+.nav-justified {
+  .nav-item .nav-link {
+    width: 100%; // Make sure button will grow
+  }
+}
+
 
 // Tabbable tabs
 //
diff --git a/_sass/bootstrap/_navbar.scss b/_sass/bootstrap/_navbar.scss
index cf5b667908..71619382cd 100644
--- a/_sass/bootstrap/_navbar.scss
+++ b/_sass/bootstrap/_navbar.scss
@@ -1,39 +1,52 @@
-// Contents
-//
-// Navbar
-// Navbar brand
-// Navbar nav
-// Navbar text
-// Navbar divider
-// Responsive navbar
-// Navbar position
-// Navbar themes
-
-
 // Navbar
 //
 // Provide a static navbar from which we expand to create full-width, fixed, and
 // other navbar variations.
 
 .navbar {
+  // scss-docs-start navbar-css-vars
+  --#{$prefix}navbar-padding-x: #{if($navbar-padding-x == null, 0, $navbar-padding-x)};
+  --#{$prefix}navbar-padding-y: #{$navbar-padding-y};
+  --#{$prefix}navbar-color: #{$navbar-light-color};
+  --#{$prefix}navbar-hover-color: #{$navbar-light-hover-color};
+  --#{$prefix}navbar-disabled-color: #{$navbar-light-disabled-color};
+  --#{$prefix}navbar-active-color: #{$navbar-light-active-color};
+  --#{$prefix}navbar-brand-padding-y: #{$navbar-brand-padding-y};
+  --#{$prefix}navbar-brand-margin-end: #{$navbar-brand-margin-end};
+  --#{$prefix}navbar-brand-font-size: #{$navbar-brand-font-size};
+  --#{$prefix}navbar-brand-color: #{$navbar-light-brand-color};
+  --#{$prefix}navbar-brand-hover-color: #{$navbar-light-brand-hover-color};
+  --#{$prefix}navbar-nav-link-padding-x: #{$navbar-nav-link-padding-x};
+  --#{$prefix}navbar-toggler-padding-y: #{$navbar-toggler-padding-y};
+  --#{$prefix}navbar-toggler-padding-x: #{$navbar-toggler-padding-x};
+  --#{$prefix}navbar-toggler-font-size: #{$navbar-toggler-font-size};
+  --#{$prefix}navbar-toggler-icon-bg: #{escape-svg($navbar-light-toggler-icon-bg)};
+  --#{$prefix}navbar-toggler-border-color: #{$navbar-light-toggler-border-color};
+  --#{$prefix}navbar-toggler-border-radius: #{$navbar-toggler-border-radius};
+  --#{$prefix}navbar-toggler-focus-width: #{$navbar-toggler-focus-width};
+  --#{$prefix}navbar-toggler-transition: #{$navbar-toggler-transition};
+  // scss-docs-end navbar-css-vars
+
   position: relative;
   display: flex;
   flex-wrap: wrap; // allow us to do the line break for collapsing content
   align-items: center;
   justify-content: space-between; // space out brand from logo
-  padding: $navbar-padding-y $navbar-padding-x;
+  padding: var(--#{$prefix}navbar-padding-y) var(--#{$prefix}navbar-padding-x);
+  @include gradient-bg();
 
   // Because flex properties aren't inherited, we need to redeclare these first
   // few properties so that content nested within behave properly.
+  // The `flex-wrap` property is inherited to simplify the expanded navbars
   %container-flex-properties {
     display: flex;
-    flex-wrap: wrap;
+    flex-wrap: inherit;
     align-items: center;
     justify-content: space-between;
   }
 
-  .container,
-  .container-fluid {
+  > .container,
+  > .container-fluid {
     @extend %container-flex-properties;
   }
 
@@ -50,16 +63,18 @@
 // Used for brand, project, or site names.
 
 .navbar-brand {
-  display: inline-block;
-  padding-top: $navbar-brand-padding-y;
-  padding-bottom: $navbar-brand-padding-y;
-  margin-right: $navbar-padding-x;
-  @include font-size($navbar-brand-font-size);
-  line-height: inherit;
+  padding-top: var(--#{$prefix}navbar-brand-padding-y);
+  padding-bottom: var(--#{$prefix}navbar-brand-padding-y);
+  margin-right: var(--#{$prefix}navbar-brand-margin-end);
+  @include font-size(var(--#{$prefix}navbar-brand-font-size));
+  color: var(--#{$prefix}navbar-brand-color);
+  text-decoration: if($link-decoration == none, null, none);
   white-space: nowrap;
 
-  @include hover-focus() {
-    text-decoration: none;
+  &:hover,
+  &:focus {
+    color: var(--#{$prefix}navbar-brand-hover-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
   }
 }
 
@@ -69,6 +84,16 @@
 // Custom navbar navigation (doesn't require `.nav`, but does make use of `.nav-link`).
 
 .navbar-nav {
+  // scss-docs-start navbar-nav-css-vars
+  --#{$prefix}nav-link-padding-x: 0;
+  --#{$prefix}nav-link-padding-y: #{$nav-link-padding-y};
+  @include rfs($nav-link-font-size, --#{$prefix}nav-link-font-size);
+  --#{$prefix}nav-link-font-weight: #{$nav-link-font-weight};
+  --#{$prefix}nav-link-color: var(--#{$prefix}navbar-color);
+  --#{$prefix}nav-link-hover-color: var(--#{$prefix}navbar-hover-color);
+  --#{$prefix}nav-link-disabled-color: var(--#{$prefix}navbar-disabled-color);
+  // scss-docs-end navbar-nav-css-vars
+
   display: flex;
   flex-direction: column; // cannot use `inherit` to get the `.navbar`s value
   padding-left: 0;
@@ -76,13 +101,14 @@
   list-style: none;
 
   .nav-link {
-    padding-right: 0;
-    padding-left: 0;
+    &.active,
+    &.show {
+      color: var(--#{$prefix}navbar-active-color);
+    }
   }
 
   .dropdown-menu {
     position: static;
-    float: none;
   }
 }
 
@@ -92,9 +118,15 @@
 //
 
 .navbar-text {
-  display: inline-block;
   padding-top: $nav-link-padding-y;
   padding-bottom: $nav-link-padding-y;
+  color: var(--#{$prefix}navbar-color);
+
+  a,
+  a:hover,
+  a:focus  {
+    color: var(--#{$prefix}navbar-active-color);
+  }
 }
 
 
@@ -116,16 +148,24 @@
 
 // Button for toggling the navbar when in its collapsed state
 .navbar-toggler {
-  padding: $navbar-toggler-padding-y $navbar-toggler-padding-x;
-  @include font-size($navbar-toggler-font-size);
+  padding: var(--#{$prefix}navbar-toggler-padding-y) var(--#{$prefix}navbar-toggler-padding-x);
+  @include font-size(var(--#{$prefix}navbar-toggler-font-size));
   line-height: 1;
+  color: var(--#{$prefix}navbar-color);
   background-color: transparent; // remove default button style
-  border: $border-width solid transparent; // remove default button style
-  @include border-radius($navbar-toggler-border-radius);
+  border: var(--#{$prefix}border-width) solid var(--#{$prefix}navbar-toggler-border-color); // remove default button style
+  @include border-radius(var(--#{$prefix}navbar-toggler-border-radius));
+  @include transition(var(--#{$prefix}navbar-toggler-transition));
 
-  @include hover-focus() {
+  &:hover {
     text-decoration: none;
   }
+
+  &:focus {
+    text-decoration: none;
+    outline: 0;
+    box-shadow: 0 0 0 var(--#{$prefix}navbar-toggler-focus-width);
+  }
 }
 
 // Keep as a separate element so folks can easily override it with another icon
@@ -135,15 +175,18 @@
   width: 1.5em;
   height: 1.5em;
   vertical-align: middle;
-  content: "";
-  background: 50% / 100% 100% no-repeat;
+  background-image: var(--#{$prefix}navbar-toggler-icon-bg);
+  background-repeat: no-repeat;
+  background-position: center;
+  background-size: 100%;
 }
 
 .navbar-nav-scroll {
-  max-height: $navbar-nav-scroll-max-height;
+  max-height: var(--#{$prefix}scroll-height, 75vh);
   overflow-y: auto;
 }
 
+// scss-docs-start navbar-expand-loop
 // Generate series of `.navbar-expand-*` responsive classes for configuring
 // where your navbar collapses.
 .navbar-expand {
@@ -151,27 +194,10 @@
     $next: breakpoint-next($breakpoint, $grid-breakpoints);
     $infix: breakpoint-infix($next, $grid-breakpoints);
 
+    // stylelint-disable-next-line scss/selector-no-union-class-name
     &#{$infix} {
-      @include media-breakpoint-down($breakpoint) {
-        %container-navbar-expand-#{$breakpoint} {
-          padding-right: 0;
-          padding-left: 0;
-        }
-
-        > .container,
-        > .container-fluid {
-          @extend %container-navbar-expand-#{$breakpoint};
-        }
-
-        @each $size, $container-max-width in $container-max-widths {
-          > .container#{breakpoint-infix($size, $container-max-widths)} {
-            @extend %container-navbar-expand-#{$breakpoint};
-          }
-        }
-      }
-
       @include media-breakpoint-up($next) {
-        flex-flow: row nowrap;
+        flex-wrap: nowrap;
         justify-content: flex-start;
 
         .navbar-nav {
@@ -182,24 +208,8 @@
           }
 
           .nav-link {
-            padding-right: $navbar-nav-link-padding-x;
-            padding-left: $navbar-nav-link-padding-x;
-          }
-        }
-
-        // For nesting containers, have to redeclare for alignment purposes
-        %container-nesting-#{$breakpoint} {
-          flex-wrap: nowrap;
-        }
-
-        > .container,
-        > .container-fluid {
-          @extend %container-nesting-#{$breakpoint};
-        }
-
-        @each $size, $container-max-width in $container-max-widths {
-          > .container#{breakpoint-infix($size, $container-max-widths)} {
-            @extend %container-nesting-#{$breakpoint};
+            padding-right: var(--#{$prefix}navbar-nav-link-padding-x);
+            padding-left: var(--#{$prefix}navbar-nav-link-padding-x);
           }
         }
 
@@ -209,124 +219,71 @@
 
         .navbar-collapse {
           display: flex !important; // stylelint-disable-line declaration-no-important
-
-          // Changes flex-bases to auto because of an IE10 bug
           flex-basis: auto;
         }
 
         .navbar-toggler {
           display: none;
         }
+
+        .offcanvas {
+          // stylelint-disable declaration-no-important
+          position: static;
+          z-index: auto;
+          flex-grow: 1;
+          width: auto !important;
+          height: auto !important;
+          visibility: visible !important;
+          background-color: transparent !important;
+          border: 0 !important;
+          transform: none !important;
+          @include box-shadow(none);
+          @include transition(none);
+          // stylelint-enable declaration-no-important
+
+          .offcanvas-header {
+            display: none;
+          }
+
+          .offcanvas-body {
+            display: flex;
+            flex-grow: 0;
+            padding: 0;
+            overflow-y: visible;
+          }
+        }
       }
     }
   }
 }
-
+// scss-docs-end navbar-expand-loop
 
 // Navbar themes
 //
 // Styles for switching between navbars with light or dark background.
 
-// Dark links against a light background
 .navbar-light {
-  .navbar-brand {
-    color: $navbar-light-brand-color;
-
-    @include hover-focus() {
-      color: $navbar-light-brand-hover-color;
-    }
-  }
-
-  .navbar-nav {
-    .nav-link {
-      color: $navbar-light-color;
-
-      @include hover-focus() {
-        color: $navbar-light-hover-color;
-      }
-
-      &.disabled {
-        color: $navbar-light-disabled-color;
-      }
-    }
-
-    .show > .nav-link,
-    .active > .nav-link,
-    .nav-link.show,
-    .nav-link.active {
-      color: $navbar-light-active-color;
-    }
-  }
-
-  .navbar-toggler {
-    color: $navbar-light-color;
-    border-color: $navbar-light-toggler-border-color;
-  }
-
-  .navbar-toggler-icon {
-    background-image: escape-svg($navbar-light-toggler-icon-bg);
-  }
-
-  .navbar-text {
-    color: $navbar-light-color;
-    a {
-      color: $navbar-light-active-color;
-
-      @include hover-focus() {
-        color: $navbar-light-active-color;
-      }
-    }
-  }
+  @include deprecate("`.navbar-light`", "v5.2.0", "v6.0.0", true);
 }
 
-// White links against a dark background
-.navbar-dark {
-  .navbar-brand {
-    color: $navbar-dark-brand-color;
-
-    @include hover-focus() {
-      color: $navbar-dark-brand-hover-color;
-    }
-  }
-
-  .navbar-nav {
-    .nav-link {
-      color: $navbar-dark-color;
-
-      @include hover-focus() {
-        color: $navbar-dark-hover-color;
-      }
-
-      &.disabled {
-        color: $navbar-dark-disabled-color;
-      }
-    }
-
-    .show > .nav-link,
-    .active > .nav-link,
-    .nav-link.show,
-    .nav-link.active {
-      color: $navbar-dark-active-color;
-    }
-  }
-
-  .navbar-toggler {
-    color: $navbar-dark-color;
-    border-color: $navbar-dark-toggler-border-color;
-  }
-
-  .navbar-toggler-icon {
-    background-image: escape-svg($navbar-dark-toggler-icon-bg);
-  }
-
-  .navbar-text {
-    color: $navbar-dark-color;
-    a {
-      color: $navbar-dark-active-color;
+.navbar-dark,
+.navbar[data-bs-theme="dark"] {
+  // scss-docs-start navbar-dark-css-vars
+  --#{$prefix}navbar-color: #{$navbar-dark-color};
+  --#{$prefix}navbar-hover-color: #{$navbar-dark-hover-color};
+  --#{$prefix}navbar-disabled-color: #{$navbar-dark-disabled-color};
+  --#{$prefix}navbar-active-color: #{$navbar-dark-active-color};
+  --#{$prefix}navbar-brand-color: #{$navbar-dark-brand-color};
+  --#{$prefix}navbar-brand-hover-color: #{$navbar-dark-brand-hover-color};
+  --#{$prefix}navbar-toggler-border-color: #{$navbar-dark-toggler-border-color};
+  --#{$prefix}navbar-toggler-icon-bg: #{escape-svg($navbar-dark-toggler-icon-bg)};
+  // scss-docs-end navbar-dark-css-vars
+}
 
-      @include hover-focus() {
-        color: $navbar-dark-active-color;
-      }
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .navbar-toggler-icon {
+      --#{$prefix}navbar-toggler-icon-bg: #{escape-svg($navbar-dark-toggler-icon-bg)};
     }
   }
 }
diff --git a/_sass/bootstrap/_offcanvas.scss b/_sass/bootstrap/_offcanvas.scss
new file mode 100644
index 0000000000..04e3ce6442
--- /dev/null
+++ b/_sass/bootstrap/_offcanvas.scss
@@ -0,0 +1,146 @@
+// stylelint-disable function-disallowed-list
+
+%offcanvas-css-vars {
+  // scss-docs-start offcanvas-css-vars
+  --#{$prefix}offcanvas-zindex: #{$zindex-offcanvas};
+  --#{$prefix}offcanvas-width: #{$offcanvas-horizontal-width};
+  --#{$prefix}offcanvas-height: #{$offcanvas-vertical-height};
+  --#{$prefix}offcanvas-padding-x: #{$offcanvas-padding-x};
+  --#{$prefix}offcanvas-padding-y: #{$offcanvas-padding-y};
+  --#{$prefix}offcanvas-color: #{$offcanvas-color};
+  --#{$prefix}offcanvas-bg: #{$offcanvas-bg-color};
+  --#{$prefix}offcanvas-border-width: #{$offcanvas-border-width};
+  --#{$prefix}offcanvas-border-color: #{$offcanvas-border-color};
+  --#{$prefix}offcanvas-box-shadow: #{$offcanvas-box-shadow};
+  --#{$prefix}offcanvas-transition: #{transform $offcanvas-transition-duration ease-in-out};
+  --#{$prefix}offcanvas-title-line-height: #{$offcanvas-title-line-height};
+  // scss-docs-end offcanvas-css-vars
+}
+
+@each $breakpoint in map-keys($grid-breakpoints) {
+  $next: breakpoint-next($breakpoint, $grid-breakpoints);
+  $infix: breakpoint-infix($next, $grid-breakpoints);
+
+  .offcanvas#{$infix} {
+    @extend %offcanvas-css-vars;
+  }
+}
+
+@each $breakpoint in map-keys($grid-breakpoints) {
+  $next: breakpoint-next($breakpoint, $grid-breakpoints);
+  $infix: breakpoint-infix($next, $grid-breakpoints);
+
+  .offcanvas#{$infix} {
+    @include media-breakpoint-down($next) {
+      position: fixed;
+      bottom: 0;
+      z-index: var(--#{$prefix}offcanvas-zindex);
+      display: flex;
+      flex-direction: column;
+      max-width: 100%;
+      color: var(--#{$prefix}offcanvas-color);
+      visibility: hidden;
+      background-color: var(--#{$prefix}offcanvas-bg);
+      background-clip: padding-box;
+      outline: 0;
+      @include box-shadow(var(--#{$prefix}offcanvas-box-shadow));
+      @include transition(var(--#{$prefix}offcanvas-transition));
+
+      &.offcanvas-start {
+        top: 0;
+        left: 0;
+        width: var(--#{$prefix}offcanvas-width);
+        border-right: var(--#{$prefix}offcanvas-border-width) solid var(--#{$prefix}offcanvas-border-color);
+        transform: translateX(-100%);
+      }
+
+      &.offcanvas-end {
+        top: 0;
+        right: 0;
+        width: var(--#{$prefix}offcanvas-width);
+        border-left: var(--#{$prefix}offcanvas-border-width) solid var(--#{$prefix}offcanvas-border-color);
+        transform: translateX(100%);
+      }
+
+      &.offcanvas-top {
+        top: 0;
+        right: 0;
+        left: 0;
+        height: var(--#{$prefix}offcanvas-height);
+        max-height: 100%;
+        border-bottom: var(--#{$prefix}offcanvas-border-width) solid var(--#{$prefix}offcanvas-border-color);
+        transform: translateY(-100%);
+      }
+
+      &.offcanvas-bottom {
+        right: 0;
+        left: 0;
+        height: var(--#{$prefix}offcanvas-height);
+        max-height: 100%;
+        border-top: var(--#{$prefix}offcanvas-border-width) solid var(--#{$prefix}offcanvas-border-color);
+        transform: translateY(100%);
+      }
+
+      &.showing,
+      &.show:not(.hiding) {
+        transform: none;
+      }
+
+      &.showing,
+      &.hiding,
+      &.show {
+        visibility: visible;
+      }
+    }
+
+    @if not ($infix == "") {
+      @include media-breakpoint-up($next) {
+        --#{$prefix}offcanvas-height: auto;
+        --#{$prefix}offcanvas-border-width: 0;
+        background-color: transparent !important; // stylelint-disable-line declaration-no-important
+
+        .offcanvas-header {
+          display: none;
+        }
+
+        .offcanvas-body {
+          display: flex;
+          flex-grow: 0;
+          padding: 0;
+          overflow-y: visible;
+          // Reset `background-color` in case `.bg-*` classes are used in offcanvas
+          background-color: transparent !important; // stylelint-disable-line declaration-no-important
+        }
+      }
+    }
+  }
+}
+
+.offcanvas-backdrop {
+  @include overlay-backdrop($zindex-offcanvas-backdrop, $offcanvas-backdrop-bg, $offcanvas-backdrop-opacity);
+}
+
+.offcanvas-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--#{$prefix}offcanvas-padding-y) var(--#{$prefix}offcanvas-padding-x);
+
+  .btn-close {
+    padding: calc(var(--#{$prefix}offcanvas-padding-y) * .5) calc(var(--#{$prefix}offcanvas-padding-x) * .5);
+    margin-top: calc(-.5 * var(--#{$prefix}offcanvas-padding-y));
+    margin-right: calc(-.5 * var(--#{$prefix}offcanvas-padding-x));
+    margin-bottom: calc(-.5 * var(--#{$prefix}offcanvas-padding-y));
+  }
+}
+
+.offcanvas-title {
+  margin-bottom: 0;
+  line-height: var(--#{$prefix}offcanvas-title-line-height);
+}
+
+.offcanvas-body {
+  flex-grow: 1;
+  padding: var(--#{$prefix}offcanvas-padding-y) var(--#{$prefix}offcanvas-padding-x);
+  overflow-y: auto;
+}
diff --git a/_sass/bootstrap/_pagination.scss b/_sass/bootstrap/_pagination.scss
index 9313cc5475..f275a62eb4 100644
--- a/_sass/bootstrap/_pagination.scss
+++ b/_sass/bootstrap/_pagination.scss
@@ -1,62 +1,97 @@
 .pagination {
+  // scss-docs-start pagination-css-vars
+  --#{$prefix}pagination-padding-x: #{$pagination-padding-x};
+  --#{$prefix}pagination-padding-y: #{$pagination-padding-y};
+  @include rfs($pagination-font-size, --#{$prefix}pagination-font-size);
+  --#{$prefix}pagination-color: #{$pagination-color};
+  --#{$prefix}pagination-bg: #{$pagination-bg};
+  --#{$prefix}pagination-border-width: #{$pagination-border-width};
+  --#{$prefix}pagination-border-color: #{$pagination-border-color};
+  --#{$prefix}pagination-border-radius: #{$pagination-border-radius};
+  --#{$prefix}pagination-hover-color: #{$pagination-hover-color};
+  --#{$prefix}pagination-hover-bg: #{$pagination-hover-bg};
+  --#{$prefix}pagination-hover-border-color: #{$pagination-hover-border-color};
+  --#{$prefix}pagination-focus-color: #{$pagination-focus-color};
+  --#{$prefix}pagination-focus-bg: #{$pagination-focus-bg};
+  --#{$prefix}pagination-focus-box-shadow: #{$pagination-focus-box-shadow};
+  --#{$prefix}pagination-active-color: #{$pagination-active-color};
+  --#{$prefix}pagination-active-bg: #{$pagination-active-bg};
+  --#{$prefix}pagination-active-border-color: #{$pagination-active-border-color};
+  --#{$prefix}pagination-disabled-color: #{$pagination-disabled-color};
+  --#{$prefix}pagination-disabled-bg: #{$pagination-disabled-bg};
+  --#{$prefix}pagination-disabled-border-color: #{$pagination-disabled-border-color};
+  // scss-docs-end pagination-css-vars
+
   display: flex;
   @include list-unstyled();
-  @include border-radius();
 }
 
 .page-link {
   position: relative;
   display: block;
-  padding: $pagination-padding-y $pagination-padding-x;
-  margin-left: -$pagination-border-width;
-  line-height: $pagination-line-height;
-  color: $pagination-color;
+  padding: var(--#{$prefix}pagination-padding-y) var(--#{$prefix}pagination-padding-x);
+  @include font-size(var(--#{$prefix}pagination-font-size));
+  color: var(--#{$prefix}pagination-color);
   text-decoration: if($link-decoration == none, null, none);
-  background-color: $pagination-bg;
-  border: $pagination-border-width solid $pagination-border-color;
+  background-color: var(--#{$prefix}pagination-bg);
+  border: var(--#{$prefix}pagination-border-width) solid var(--#{$prefix}pagination-border-color);
+  @include transition($pagination-transition);
 
   &:hover {
     z-index: 2;
-    color: $pagination-hover-color;
-    text-decoration: none;
-    background-color: $pagination-hover-bg;
-    border-color: $pagination-hover-border-color;
+    color: var(--#{$prefix}pagination-hover-color);
+    text-decoration: if($link-hover-decoration == underline, none, null);
+    background-color: var(--#{$prefix}pagination-hover-bg);
+    border-color: var(--#{$prefix}pagination-hover-border-color);
   }
 
   &:focus {
     z-index: 3;
+    color: var(--#{$prefix}pagination-focus-color);
+    background-color: var(--#{$prefix}pagination-focus-bg);
     outline: $pagination-focus-outline;
-    box-shadow: $pagination-focus-box-shadow;
+    box-shadow: var(--#{$prefix}pagination-focus-box-shadow);
   }
-}
 
-.page-item {
-  &:first-child {
-    .page-link {
-      margin-left: 0;
-      @include border-left-radius($border-radius);
-    }
+  &.active,
+  .active > & {
+    z-index: 3;
+    color: var(--#{$prefix}pagination-active-color);
+    @include gradient-bg(var(--#{$prefix}pagination-active-bg));
+    border-color: var(--#{$prefix}pagination-active-border-color);
   }
-  &:last-child {
-    .page-link {
-      @include border-right-radius($border-radius);
-    }
+
+  &.disabled,
+  .disabled > & {
+    color: var(--#{$prefix}pagination-disabled-color);
+    pointer-events: none;
+    background-color: var(--#{$prefix}pagination-disabled-bg);
+    border-color: var(--#{$prefix}pagination-disabled-border-color);
   }
+}
 
-  &.active .page-link {
-    z-index: 3;
-    color: $pagination-active-color;
-    background-color: $pagination-active-bg;
-    border-color: $pagination-active-border-color;
+.page-item {
+  &:not(:first-child) .page-link {
+    margin-left: $pagination-margin-start;
   }
 
-  &.disabled .page-link {
-    color: $pagination-disabled-color;
-    pointer-events: none;
-    // Opinionated: remove the "hand" cursor set previously for .page-link
-    cursor: auto;
-    background-color: $pagination-disabled-bg;
-    border-color: $pagination-disabled-border-color;
+  @if $pagination-margin-start == calc(#{$pagination-border-width} * -1) {
+    &:first-child {
+      .page-link {
+        @include border-start-radius(var(--#{$prefix}pagination-border-radius));
+      }
+    }
+
+    &:last-child {
+      .page-link {
+        @include border-end-radius(var(--#{$prefix}pagination-border-radius));
+      }
+    }
+  } @else {
+    // Add border-radius to all pageLinks in case they have left margin
+    .page-link {
+      @include border-radius(var(--#{$prefix}pagination-border-radius));
+    }
   }
 }
 
@@ -66,9 +101,9 @@
 //
 
 .pagination-lg {
-  @include pagination-size($pagination-padding-y-lg, $pagination-padding-x-lg, $font-size-lg, $line-height-lg, $pagination-border-radius-lg);
+  @include pagination-size($pagination-padding-y-lg, $pagination-padding-x-lg, $font-size-lg, $pagination-border-radius-lg);
 }
 
 .pagination-sm {
-  @include pagination-size($pagination-padding-y-sm, $pagination-padding-x-sm, $font-size-sm, $line-height-sm, $pagination-border-radius-sm);
+  @include pagination-size($pagination-padding-y-sm, $pagination-padding-x-sm, $font-size-sm, $pagination-border-radius-sm);
 }
diff --git a/_sass/bootstrap/_placeholders.scss b/_sass/bootstrap/_placeholders.scss
new file mode 100644
index 0000000000..6e32e1cdb9
--- /dev/null
+++ b/_sass/bootstrap/_placeholders.scss
@@ -0,0 +1,51 @@
+.placeholder {
+  display: inline-block;
+  min-height: 1em;
+  vertical-align: middle;
+  cursor: wait;
+  background-color: currentcolor;
+  opacity: $placeholder-opacity-max;
+
+  &.btn::before {
+    display: inline-block;
+    content: "";
+  }
+}
+
+// Sizing
+.placeholder-xs {
+  min-height: .6em;
+}
+
+.placeholder-sm {
+  min-height: .8em;
+}
+
+.placeholder-lg {
+  min-height: 1.2em;
+}
+
+// Animation
+.placeholder-glow {
+  .placeholder {
+    animation: placeholder-glow 2s ease-in-out infinite;
+  }
+}
+
+@keyframes placeholder-glow {
+  50% {
+    opacity: $placeholder-opacity-min;
+  }
+}
+
+.placeholder-wave {
+  mask-image: linear-gradient(130deg, $black 55%, rgba(0, 0, 0, (1 - $placeholder-opacity-min)) 75%, $black 95%);
+  mask-size: 200% 100%;
+  animation: placeholder-wave 2s linear infinite;
+}
+
+@keyframes placeholder-wave {
+  100% {
+    mask-position: -200% 0%;
+  }
+}
diff --git a/_sass/bootstrap/_popover.scss b/_sass/bootstrap/_popover.scss
index 0ad76af3ee..7b69f62328 100644
--- a/_sass/bootstrap/_popover.scss
+++ b/_sass/bootstrap/_popover.scss
@@ -1,28 +1,46 @@
 .popover {
-  position: absolute;
-  top: 0;
-  left: 0;
-  z-index: $zindex-popover;
+  // scss-docs-start popover-css-vars
+  --#{$prefix}popover-zindex: #{$zindex-popover};
+  --#{$prefix}popover-max-width: #{$popover-max-width};
+  @include rfs($popover-font-size, --#{$prefix}popover-font-size);
+  --#{$prefix}popover-bg: #{$popover-bg};
+  --#{$prefix}popover-border-width: #{$popover-border-width};
+  --#{$prefix}popover-border-color: #{$popover-border-color};
+  --#{$prefix}popover-border-radius: #{$popover-border-radius};
+  --#{$prefix}popover-inner-border-radius: #{$popover-inner-border-radius};
+  --#{$prefix}popover-box-shadow: #{$popover-box-shadow};
+  --#{$prefix}popover-header-padding-x: #{$popover-header-padding-x};
+  --#{$prefix}popover-header-padding-y: #{$popover-header-padding-y};
+  @include rfs($popover-header-font-size, --#{$prefix}popover-header-font-size);
+  --#{$prefix}popover-header-color: #{$popover-header-color};
+  --#{$prefix}popover-header-bg: #{$popover-header-bg};
+  --#{$prefix}popover-body-padding-x: #{$popover-body-padding-x};
+  --#{$prefix}popover-body-padding-y: #{$popover-body-padding-y};
+  --#{$prefix}popover-body-color: #{$popover-body-color};
+  --#{$prefix}popover-arrow-width: #{$popover-arrow-width};
+  --#{$prefix}popover-arrow-height: #{$popover-arrow-height};
+  --#{$prefix}popover-arrow-border: var(--#{$prefix}popover-border-color);
+  // scss-docs-end popover-css-vars
+
+  z-index: var(--#{$prefix}popover-zindex);
   display: block;
-  max-width: $popover-max-width;
+  max-width: var(--#{$prefix}popover-max-width);
   // Our parent element can be arbitrary since tooltips are by default inserted as a sibling of their target element.
   // So reset our font and text properties to avoid inheriting weird values.
   @include reset-text();
-  @include font-size($popover-font-size);
+  @include font-size(var(--#{$prefix}popover-font-size));
   // Allow breaking very long words so they don't overflow the popover's bounds
   word-wrap: break-word;
-  background-color: $popover-bg;
+  background-color: var(--#{$prefix}popover-bg);
   background-clip: padding-box;
-  border: $popover-border-width solid $popover-border-color;
-  @include border-radius($popover-border-radius);
-  @include box-shadow($popover-box-shadow);
+  border: var(--#{$prefix}popover-border-width) solid var(--#{$prefix}popover-border-color);
+  @include border-radius(var(--#{$prefix}popover-border-radius));
+  @include box-shadow(var(--#{$prefix}popover-box-shadow));
 
-  .arrow {
-    position: absolute;
+  .popover-arrow {
     display: block;
-    width: $popover-arrow-width;
-    height: $popover-arrow-height;
-    margin: 0 $popover-border-radius;
+    width: var(--#{$prefix}popover-arrow-width);
+    height: var(--#{$prefix}popover-arrow-height);
 
     &::before,
     &::after {
@@ -31,69 +49,75 @@
       content: "";
       border-color: transparent;
       border-style: solid;
+      border-width: 0;
     }
   }
 }
 
 .bs-popover-top {
-  margin-bottom: $popover-arrow-height;
+  > .popover-arrow {
+    bottom: calc(-1 * (var(--#{$prefix}popover-arrow-height)) - var(--#{$prefix}popover-border-width)); // stylelint-disable-line function-disallowed-list
 
-  > .arrow {
-    bottom: subtract(-$popover-arrow-height, $popover-border-width);
+    &::before,
+    &::after {
+      border-width: var(--#{$prefix}popover-arrow-height) calc(var(--#{$prefix}popover-arrow-width) * .5) 0; // stylelint-disable-line function-disallowed-list
+    }
 
     &::before {
       bottom: 0;
-      border-width: $popover-arrow-height ($popover-arrow-width / 2) 0;
-      border-top-color: $popover-arrow-outer-color;
+      border-top-color: var(--#{$prefix}popover-arrow-border);
     }
 
     &::after {
-      bottom: $popover-border-width;
-      border-width: $popover-arrow-height ($popover-arrow-width / 2) 0;
-      border-top-color: $popover-arrow-color;
+      bottom: var(--#{$prefix}popover-border-width);
+      border-top-color: var(--#{$prefix}popover-bg);
     }
   }
 }
 
-.bs-popover-right {
-  margin-left: $popover-arrow-height;
+/* rtl:begin:ignore */
+.bs-popover-end {
+  > .popover-arrow {
+    left: calc(-1 * (var(--#{$prefix}popover-arrow-height)) - var(--#{$prefix}popover-border-width)); // stylelint-disable-line function-disallowed-list
+    width: var(--#{$prefix}popover-arrow-height);
+    height: var(--#{$prefix}popover-arrow-width);
 
-  > .arrow {
-    left: subtract(-$popover-arrow-height, $popover-border-width);
-    width: $popover-arrow-height;
-    height: $popover-arrow-width;
-    margin: $popover-border-radius 0; // make sure the arrow does not touch the popover's rounded corners
+    &::before,
+    &::after {
+      border-width: calc(var(--#{$prefix}popover-arrow-width) * .5) var(--#{$prefix}popover-arrow-height) calc(var(--#{$prefix}popover-arrow-width) * .5) 0; // stylelint-disable-line function-disallowed-list
+    }
 
     &::before {
       left: 0;
-      border-width: ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2) 0;
-      border-right-color: $popover-arrow-outer-color;
+      border-right-color: var(--#{$prefix}popover-arrow-border);
     }
 
     &::after {
-      left: $popover-border-width;
-      border-width: ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2) 0;
-      border-right-color: $popover-arrow-color;
+      left: var(--#{$prefix}popover-border-width);
+      border-right-color: var(--#{$prefix}popover-bg);
     }
   }
 }
 
+/* rtl:end:ignore */
+
 .bs-popover-bottom {
-  margin-top: $popover-arrow-height;
+  > .popover-arrow {
+    top: calc(-1 * (var(--#{$prefix}popover-arrow-height)) - var(--#{$prefix}popover-border-width)); // stylelint-disable-line function-disallowed-list
 
-  > .arrow {
-    top: subtract(-$popover-arrow-height, $popover-border-width);
+    &::before,
+    &::after {
+      border-width: 0 calc(var(--#{$prefix}popover-arrow-width) * .5) var(--#{$prefix}popover-arrow-height); // stylelint-disable-line function-disallowed-list
+    }
 
     &::before {
       top: 0;
-      border-width: 0 ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2);
-      border-bottom-color: $popover-arrow-outer-color;
+      border-bottom-color: var(--#{$prefix}popover-arrow-border);
     }
 
     &::after {
-      top: $popover-border-width;
-      border-width: 0 ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2);
-      border-bottom-color: $popover-arrow-color;
+      top: var(--#{$prefix}popover-border-width);
+      border-bottom-color: var(--#{$prefix}popover-bg);
     }
   }
 
@@ -103,61 +127,63 @@
     top: 0;
     left: 50%;
     display: block;
-    width: $popover-arrow-width;
-    margin-left: -$popover-arrow-width / 2;
+    width: var(--#{$prefix}popover-arrow-width);
+    margin-left: calc(-.5 * var(--#{$prefix}popover-arrow-width)); // stylelint-disable-line function-disallowed-list
     content: "";
-    border-bottom: $popover-border-width solid $popover-header-bg;
+    border-bottom: var(--#{$prefix}popover-border-width) solid var(--#{$prefix}popover-header-bg);
   }
 }
 
-.bs-popover-left {
-  margin-right: $popover-arrow-height;
+/* rtl:begin:ignore */
+.bs-popover-start {
+  > .popover-arrow {
+    right: calc(-1 * (var(--#{$prefix}popover-arrow-height)) - var(--#{$prefix}popover-border-width)); // stylelint-disable-line function-disallowed-list
+    width: var(--#{$prefix}popover-arrow-height);
+    height: var(--#{$prefix}popover-arrow-width);
 
-  > .arrow {
-    right: subtract(-$popover-arrow-height, $popover-border-width);
-    width: $popover-arrow-height;
-    height: $popover-arrow-width;
-    margin: $popover-border-radius 0; // make sure the arrow does not touch the popover's rounded corners
+    &::before,
+    &::after {
+      border-width: calc(var(--#{$prefix}popover-arrow-width) * .5) 0 calc(var(--#{$prefix}popover-arrow-width) * .5) var(--#{$prefix}popover-arrow-height); // stylelint-disable-line function-disallowed-list
+    }
 
     &::before {
       right: 0;
-      border-width: ($popover-arrow-width / 2) 0 ($popover-arrow-width / 2) $popover-arrow-height;
-      border-left-color: $popover-arrow-outer-color;
+      border-left-color: var(--#{$prefix}popover-arrow-border);
     }
 
     &::after {
-      right: $popover-border-width;
-      border-width: ($popover-arrow-width / 2) 0 ($popover-arrow-width / 2) $popover-arrow-height;
-      border-left-color: $popover-arrow-color;
+      right: var(--#{$prefix}popover-border-width);
+      border-left-color: var(--#{$prefix}popover-bg);
     }
   }
 }
 
+/* rtl:end:ignore */
+
 .bs-popover-auto {
-  &[x-placement^="top"] {
+  &[data-popper-placement^="top"] {
     @extend .bs-popover-top;
   }
-  &[x-placement^="right"] {
-    @extend .bs-popover-right;
+  &[data-popper-placement^="right"] {
+    @extend .bs-popover-end;
   }
-  &[x-placement^="bottom"] {
+  &[data-popper-placement^="bottom"] {
     @extend .bs-popover-bottom;
   }
-  &[x-placement^="left"] {
-    @extend .bs-popover-left;
+  &[data-popper-placement^="left"] {
+    @extend .bs-popover-start;
   }
 }
 
-
 // Offset the popover to account for the popover arrow
 .popover-header {
-  padding: $popover-header-padding-y $popover-header-padding-x;
+  padding: var(--#{$prefix}popover-header-padding-y) var(--#{$prefix}popover-header-padding-x);
   margin-bottom: 0; // Reset the default from Reboot
-  @include font-size($font-size-base);
-  color: $popover-header-color;
-  background-color: $popover-header-bg;
-  border-bottom: $popover-border-width solid darken($popover-header-bg, 5%);
-  @include border-top-radius($popover-inner-border-radius);
+  @include font-size(var(--#{$prefix}popover-header-font-size));
+  color: var(--#{$prefix}popover-header-color);
+  background-color: var(--#{$prefix}popover-header-bg);
+  border-bottom: var(--#{$prefix}popover-border-width) solid var(--#{$prefix}popover-border-color);
+  @include border-top-radius(var(--#{$prefix}popover-inner-border-radius));
 
   &:empty {
     display: none;
@@ -165,6 +191,6 @@
 }
 
 .popover-body {
-  padding: $popover-body-padding-y $popover-body-padding-x;
-  color: $popover-body-color;
+  padding: var(--#{$prefix}popover-body-padding-y) var(--#{$prefix}popover-body-padding-x);
+  color: var(--#{$prefix}popover-body-color);
 }
diff --git a/_sass/bootstrap/_print.scss b/_sass/bootstrap/_print.scss
deleted file mode 100644
index 8f73024a8b..0000000000
--- a/_sass/bootstrap/_print.scss
+++ /dev/null
@@ -1,141 +0,0 @@
-// stylelint-disable declaration-no-important, selector-no-qualifying-type
-
-// Source: https://github.com/h5bp/main.css/blob/master/src/_print.css
-
-// ==========================================================================
-// Print styles.
-// Inlined to avoid the additional HTTP request:
-// https://www.phpied.com/delay-loading-your-print-css/
-// ==========================================================================
-
-@if $enable-print-styles {
-  @media print {
-    *,
-    *::before,
-    *::after {
-      // Bootstrap specific; comment out `color` and `background`
-      //color: $black !important; // Black prints faster
-      text-shadow: none !important;
-      //background: transparent !important;
-      box-shadow: none !important;
-    }
-
-    a {
-      &:not(.btn) {
-        text-decoration: underline;
-      }
-    }
-
-    // Bootstrap specific; comment the following selector out
-    //a[href]::after {
-    //  content: " (" attr(href) ")";
-    //}
-
-    abbr[title]::after {
-      content: " (" attr(title) ")";
-    }
-
-    // Bootstrap specific; comment the following selector out
-    //
-    // Don't show links that are fragment identifiers,
-    // or use the `javascript:` pseudo protocol
-    //
-
-    //a[href^="#"]::after,
-    //a[href^="javascript:"]::after {
-    // content: "";
-    //}
-
-    pre {
-      white-space: pre-wrap !important;
-    }
-    pre,
-    blockquote {
-      border: $border-width solid $gray-500; // Bootstrap custom code; using `$border-width` instead of 1px
-      page-break-inside: avoid;
-    }
-
-    //
-    // Printing Tables:
-    // https://web.archive.org/web/20180815150934/http://css-discuss.incutio.com/wiki/Printing_Tables
-    //
-
-    thead {
-      display: table-header-group;
-    }
-
-    tr,
-    img {
-      page-break-inside: avoid;
-    }
-
-    p,
-    h2,
-    h3 {
-      orphans: 3;
-      widows: 3;
-    }
-
-    h2,
-    h3 {
-      page-break-after: avoid;
-    }
-
-    // Bootstrap specific changes start
-
-    // Specify a size and min-width to make printing closer across browsers.
-    // We don't set margin here because it breaks `size` in Chrome. We also
-    // don't use `!important` on `size` as it breaks in Chrome.
-    @page {
-      size: $print-page-size;
-    }
-    body {
-      min-width: $print-body-min-width !important;
-    }
-    .container {
-      min-width: $print-body-min-width !important;
-    }
-
-    // Bootstrap components
-    .navbar {
-      display: none;
-    }
-    .badge {
-      border: $border-width solid $black;
-    }
-
-    .table {
-      border-collapse: collapse !important;
-
-      td,
-      th {
-        background-color: $white !important;
-      }
-    }
-
-    .table-bordered {
-      th,
-      td {
-        border: 1px solid $gray-300 !important;
-      }
-    }
-
-    .table-dark {
-      color: inherit;
-
-      th,
-      td,
-      thead th,
-      tbody + tbody {
-        border-color: $table-border-color;
-      }
-    }
-
-    .table .thead-dark th {
-      color: inherit;
-      border-color: $table-border-color;
-    }
-
-    // Bootstrap specific changes end
-  }
-}
diff --git a/_sass/bootstrap/_progress.scss b/_sass/bootstrap/_progress.scss
index e206474a83..148c3815e8 100644
--- a/_sass/bootstrap/_progress.scss
+++ b/_sass/bootstrap/_progress.scss
@@ -1,20 +1,33 @@
 // Disable animation if transitions are disabled
+
+// scss-docs-start progress-keyframes
 @if $enable-transitions {
   @keyframes progress-bar-stripes {
-    from { background-position: $progress-height 0; }
-    to { background-position: 0 0; }
+    0% { background-position-x: $progress-height; }
   }
 }
+// scss-docs-end progress-keyframes
+
+.progress,
+.progress-stacked {
+  // scss-docs-start progress-css-vars
+  --#{$prefix}progress-height: #{$progress-height};
+  @include rfs($progress-font-size, --#{$prefix}progress-font-size);
+  --#{$prefix}progress-bg: #{$progress-bg};
+  --#{$prefix}progress-border-radius: #{$progress-border-radius};
+  --#{$prefix}progress-box-shadow: #{$progress-box-shadow};
+  --#{$prefix}progress-bar-color: #{$progress-bar-color};
+  --#{$prefix}progress-bar-bg: #{$progress-bar-bg};
+  --#{$prefix}progress-bar-transition: #{$progress-bar-transition};
+  // scss-docs-end progress-css-vars
 
-.progress {
   display: flex;
-  height: $progress-height;
+  height: var(--#{$prefix}progress-height);
   overflow: hidden; // force rounded corners by cropping it
-  line-height: 0;
-  @include font-size($progress-font-size);
-  background-color: $progress-bg;
-  @include border-radius($progress-border-radius);
-  @include box-shadow($progress-box-shadow);
+  @include font-size(var(--#{$prefix}progress-font-size));
+  background-color: var(--#{$prefix}progress-bg);
+  @include border-radius(var(--#{$prefix}progress-border-radius));
+  @include box-shadow(var(--#{$prefix}progress-box-shadow));
 }
 
 .progress-bar {
@@ -22,23 +35,31 @@
   flex-direction: column;
   justify-content: center;
   overflow: hidden;
-  color: $progress-bar-color;
+  color: var(--#{$prefix}progress-bar-color);
   text-align: center;
   white-space: nowrap;
-  background-color: $progress-bar-bg;
-  @include transition($progress-bar-transition);
+  background-color: var(--#{$prefix}progress-bar-bg);
+  @include transition(var(--#{$prefix}progress-bar-transition));
 }
 
 .progress-bar-striped {
   @include gradient-striped();
-  background-size: $progress-height $progress-height;
+  background-size: var(--#{$prefix}progress-height) var(--#{$prefix}progress-height);
+}
+
+.progress-stacked > .progress {
+  overflow: visible;
+}
+
+.progress-stacked > .progress > .progress-bar {
+  width: 100%;
 }
 
 @if $enable-transitions {
   .progress-bar-animated {
     animation: $progress-bar-animation-timing progress-bar-stripes;
 
-    @if $enable-prefers-reduced-motion-media-query {
+    @if $enable-reduced-motion {
       @media (prefers-reduced-motion: reduce) {
         animation: none;
       }
diff --git a/_sass/bootstrap/_reboot.scss b/_sass/bootstrap/_reboot.scss
index cd93bfe240..18791753d0 100644
--- a/_sass/bootstrap/_reboot.scss
+++ b/_sass/bootstrap/_reboot.scss
@@ -1,5 +1,6 @@
 // stylelint-disable declaration-no-important, selector-no-qualifying-type, property-no-vendor-prefix
 
+
 // Reboot
 //
 // Normalization of HTML elements, manually forked from Normalize.css to remove
@@ -10,122 +11,156 @@
 
 // Document
 //
-// 1. Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`.
-// 2. Change the default font family in all browsers.
-// 3. Correct the line height in all browsers.
-// 4. Prevent adjustments of font size after orientation changes in IE on Windows Phone and in iOS.
-// 5. Change the default tap highlight to be completely transparent in iOS.
+// Change from `box-sizing: content-box` so that `width` is not affected by `padding` or `border`.
 
 *,
 *::before,
 *::after {
-  box-sizing: border-box; // 1
+  box-sizing: border-box;
 }
 
-html {
-  font-family: sans-serif; // 2
-  line-height: 1.15; // 3
-  -webkit-text-size-adjust: 100%; // 4
-  -webkit-tap-highlight-color: rgba($black, 0); // 5
-}
 
-// Shim for "new" HTML5 structural elements to display correctly (IE10, older browsers)
-// TODO: remove in v5
-// stylelint-disable-next-line selector-list-comma-newline-after
-article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
-  display: block;
+// Root
+//
+// Ability to the value of the root font sizes, affecting the value of `rem`.
+// null by default, thus nothing is generated.
+
+:root {
+  @if $font-size-root != null {
+    @include font-size(var(--#{$prefix}root-font-size));
+  }
+
+  @if $enable-smooth-scroll {
+    @media (prefers-reduced-motion: no-preference) {
+      scroll-behavior: smooth;
+    }
+  }
 }
 
+
 // Body
 //
 // 1. Remove the margin in all browsers.
 // 2. As a best practice, apply a default `background-color`.
-// 3. Set an explicit initial text-align value so that we can later use
-//    the `inherit` value on things like `<th>` elements.
+// 3. Prevent adjustments of font size after orientation changes in iOS.
+// 4. Change the default tap highlight to be completely transparent in iOS.
 
+// scss-docs-start reboot-body-rules
 body {
   margin: 0; // 1
-  font-family: $font-family-base;
-  @include font-size($font-size-base);
-  font-weight: $font-weight-base;
-  line-height: $line-height-base;
-  color: $body-color;
-  text-align: left; // 3
-  background-color: $body-bg; // 2
-}
-
-// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline
-// on elements that programmatically receive focus but wouldn't normally show a visible
-// focus outline. In general, this would mean that the outline is only applied if the
-// interaction that led to the element receiving programmatic focus was a keyboard interaction,
-// or the browser has somehow determined that the user is primarily a keyboard user and/or
-// wants focus outlines to always be presented.
-//
-// See https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
-// and https://developer.paciellogroup.com/blog/2018/03/focus-visible-and-backwards-compatibility/
-[tabindex="-1"]:focus:not(:focus-visible) {
-  outline: 0 !important;
+  font-family: var(--#{$prefix}body-font-family);
+  @include font-size(var(--#{$prefix}body-font-size));
+  font-weight: var(--#{$prefix}body-font-weight);
+  line-height: var(--#{$prefix}body-line-height);
+  color: var(--#{$prefix}body-color);
+  text-align: var(--#{$prefix}body-text-align);
+  background-color: var(--#{$prefix}body-bg); // 2
+  -webkit-text-size-adjust: 100%; // 3
+  -webkit-tap-highlight-color: rgba($black, 0); // 4
 }
+// scss-docs-end reboot-body-rules
 
 
 // Content grouping
 //
-// 1. Add the correct box sizing in Firefox.
-// 2. Show the overflow in Edge and IE.
+// 1. Reset Firefox's gray color
 
 hr {
-  box-sizing: content-box; // 1
-  height: 0; // 1
-  overflow: visible; // 2
+  margin: $hr-margin-y 0;
+  color: $hr-color; // 1
+  border: 0;
+  border-top: $hr-border-width solid $hr-border-color;
+  opacity: $hr-opacity;
 }
 
 
-//
 // Typography
 //
+// 1. Remove top margins from headings
+//    By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top
+//    margin for easier control within type scales as it avoids margin collapsing.
 
-// Remove top margins from headings
-//
-// By default, `<h1>`-`<h6>` all receive top and bottom margins. We nuke the top
-// margin for easier control within type scales as it avoids margin collapsing.
-// stylelint-disable-next-line selector-list-comma-newline-after
-h1, h2, h3, h4, h5, h6 {
-  margin-top: 0;
+%heading {
+  margin-top: 0; // 1
   margin-bottom: $headings-margin-bottom;
+  font-family: $headings-font-family;
+  font-style: $headings-font-style;
+  font-weight: $headings-font-weight;
+  line-height: $headings-line-height;
+  color: var(--#{$prefix}heading-color);
+}
+
+h1 {
+  @extend %heading;
+  @include font-size($h1-font-size);
+}
+
+h2 {
+  @extend %heading;
+  @include font-size($h2-font-size);
 }
 
+h3 {
+  @extend %heading;
+  @include font-size($h3-font-size);
+}
+
+h4 {
+  @extend %heading;
+  @include font-size($h4-font-size);
+}
+
+h5 {
+  @extend %heading;
+  @include font-size($h5-font-size);
+}
+
+h6 {
+  @extend %heading;
+  @include font-size($h6-font-size);
+}
+
+
 // Reset margins on paragraphs
 //
 // Similarly, the top margin on `<p>`s get reset. However, we also reset the
 // bottom margin to use `rem` units instead of `em`.
+
 p {
   margin-top: 0;
   margin-bottom: $paragraph-margin-bottom;
 }
 
+
 // Abbreviations
 //
-// 1. Duplicate behavior to the data-* attribute for our tooltip plugin
-// 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
-// 3. Add explicit cursor to indicate changed behavior.
-// 4. Remove the bottom border in Firefox 39-.
-// 5. Prevent the text-decoration to be skipped.
+// 1. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
+// 2. Add explicit cursor to indicate changed behavior.
+// 3. Prevent the text-decoration to be skipped.
 
-abbr[title],
-abbr[data-original-title] { // 1
-  text-decoration: underline; // 2
-  text-decoration: underline dotted; // 2
-  cursor: help; // 3
-  border-bottom: 0; // 4
-  text-decoration-skip-ink: none; // 5
+abbr[title] {
+  text-decoration: underline dotted; // 1
+  cursor: help; // 2
+  text-decoration-skip-ink: none; // 3
 }
 
+
+// Address
+
 address {
   margin-bottom: 1rem;
   font-style: normal;
   line-height: inherit;
 }
 
+
+// Lists
+
+ol,
+ul {
+  padding-left: 2rem;
+}
+
 ol,
 ul,
 dl {
@@ -144,33 +179,58 @@ dt {
   font-weight: $dt-font-weight;
 }
 
+// 1. Undo browser default
+
 dd {
   margin-bottom: .5rem;
-  margin-left: 0; // Undo browser default
+  margin-left: 0; // 1
 }
 
+
+// Blockquote
+
 blockquote {
   margin: 0 0 1rem;
 }
 
+
+// Strong
+//
+// Add the correct font weight in Chrome, Edge, and Safari
+
 b,
 strong {
-  font-weight: $font-weight-bolder; // Add the correct font weight in Chrome, Edge, and Safari
+  font-weight: $font-weight-bolder;
 }
 
+
+// Small
+//
+// Add the correct font size in all browsers
+
 small {
-  @include font-size(80%); // Add the correct font size in all browsers
+  @include font-size($small-font-size);
 }
 
+
+// Mark
+
+mark {
+  padding: $mark-padding;
+  color: var(--#{$prefix}highlight-color);
+  background-color: var(--#{$prefix}highlight-bg);
+}
+
+
+// Sub and Sup
 //
 // Prevent `sub` and `sup` elements from affecting the line height in
 // all browsers.
-//
 
 sub,
 sup {
   position: relative;
-  @include font-size(75%);
+  @include font-size($sub-sup-font-size);
   line-height: 0;
   vertical-align: baseline;
 }
@@ -179,17 +239,14 @@ sub { bottom: -.25em; }
 sup { top: -.5em; }
 
 
-//
 // Links
-//
 
 a {
-  color: $link-color;
+  color: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-opacity, 1));
   text-decoration: $link-decoration;
-  background-color: transparent; // Remove the gray background on active links in IE 10.
 
-  @include hover() {
-    color: $link-hover-color;
+  &:hover {
+    --#{$prefix}link-color-rgb: var(--#{$prefix}link-hover-color-rgb);
     text-decoration: $link-hover-decoration;
   }
 }
@@ -200,82 +257,101 @@ a {
 // See https://github.com/twbs/bootstrap/issues/19402
 
 a:not([href]):not([class]) {
-  color: inherit;
-  text-decoration: none;
-
-  @include hover() {
+  &,
+  &:hover {
     color: inherit;
     text-decoration: none;
   }
 }
 
 
-//
 // Code
-//
 
 pre,
 code,
 kbd,
 samp {
-  font-family: $font-family-monospace;
+  font-family: $font-family-code;
   @include font-size(1em); // Correct the odd `em` font sizing in all browsers.
 }
 
+// 1. Remove browser default top margin
+// 2. Reset browser default of `1em` to use `rem`s
+// 3. Don't allow content to break outside
+
 pre {
-  // Remove browser default top margin
-  margin-top: 0;
-  // Reset browser default of `1em` to use `rem`s
-  margin-bottom: 1rem;
-  // Don't allow content to break outside
-  overflow: auto;
-  // Disable auto-hiding scrollbar in IE & legacy Edge to avoid overlap,
-  // making it impossible to interact with the content
-  -ms-overflow-style: scrollbar;
+  display: block;
+  margin-top: 0; // 1
+  margin-bottom: 1rem; // 2
+  overflow: auto; // 3
+  @include font-size($code-font-size);
+  color: $pre-color;
+
+  // Account for some code outputs that place code tags in pre tags
+  code {
+    @include font-size(inherit);
+    color: inherit;
+    word-break: normal;
+  }
+}
+
+code {
+  @include font-size($code-font-size);
+  color: var(--#{$prefix}code-color);
+  word-wrap: break-word;
+
+  // Streamline the style when inside anchors to avoid broken underline and more
+  a > & {
+    color: inherit;
+  }
+}
+
+kbd {
+  padding: $kbd-padding-y $kbd-padding-x;
+  @include font-size($kbd-font-size);
+  color: $kbd-color;
+  background-color: $kbd-bg;
+  @include border-radius($border-radius-sm);
+
+  kbd {
+    padding: 0;
+    @include font-size(1em);
+    font-weight: $nested-kbd-font-weight;
+  }
 }
 
 
-//
 // Figures
 //
+// Apply a consistent margin strategy (matches our type styles).
 
 figure {
-  // Apply a consistent margin strategy (matches our type styles).
   margin: 0 0 1rem;
 }
 
 
-//
 // Images and content
-//
-
-img {
-  vertical-align: middle;
-  border-style: none; // Remove the border on images inside links in IE 10-.
-}
 
+img,
 svg {
-  // Workaround for the SVG overflow bug in IE10/11 is still required.
-  // See https://github.com/twbs/bootstrap/issues/26878
-  overflow: hidden;
   vertical-align: middle;
 }
 
 
-//
 // Tables
 //
+// Prevent double borders
 
 table {
-  border-collapse: collapse; // Prevent double borders
+  caption-side: bottom;
+  border-collapse: collapse;
 }
 
 caption {
-  padding-top: $table-cell-padding;
-  padding-bottom: $table-cell-padding;
+  padding-top: $table-cell-padding-y;
+  padding-bottom: $table-cell-padding-y;
   color: $table-caption-color;
   text-align: left;
-  caption-side: bottom;
 }
 
 // 1. Removes font-weight bold by inheriting
@@ -288,20 +364,29 @@ th {
   text-align: -webkit-match-parent; // 3
 }
 
+thead,
+tbody,
+tfoot,
+tr,
+td,
+th {
+  border-color: inherit;
+  border-style: solid;
+  border-width: 0;
+}
+
 
-//
 // Forms
 //
+// 1. Allow labels to use `margin` for spacing.
 
 label {
-  // Allow labels to use `margin` for spacing.
-  display: inline-block;
-  margin-bottom: $label-margin-bottom;
+  display: inline-block; // 1
 }
 
 // Remove the default `border-radius` that macOS Chrome adds.
-//
-// Details at https://github.com/twbs/bootstrap/issues/24093
+// See https://github.com/twbs/bootstrap/issues/24093
+
 button {
   // stylelint-disable-next-line property-disallowed-list
   border-radius: 0;
@@ -316,27 +401,24 @@ button:focus:not(:focus-visible) {
   outline: 0;
 }
 
+// 1. Remove the margin in Firefox and Safari
+
 input,
 button,
 select,
 optgroup,
 textarea {
-  margin: 0; // Remove the margin in Firefox and Safari
+  margin: 0; // 1
   font-family: inherit;
   @include font-size(inherit);
   line-height: inherit;
 }
 
-button,
-input {
-  overflow: visible; // Show the overflow in Edge
-}
-
+// Remove the inheritance of text transform in Firefox
 button,
 select {
-  text-transform: none; // Remove the inheritance of text transform in Firefox
+  text-transform: none;
 }
-
 // Set the cursor for non-`<button>` buttons
 //
 // Details at https://github.com/twbs/bootstrap/pull/30562
@@ -344,141 +426,186 @@ select {
   cursor: pointer;
 }
 
-// Remove the inheritance of word-wrap in Safari.
-//
-// Details at https://github.com/twbs/bootstrap/issues/24990
 select {
+  // Remove the inheritance of word-wrap in Safari.
+  // See https://github.com/twbs/bootstrap/issues/24990
   word-wrap: normal;
+
+  // Undo the opacity change from Chrome
+  &:disabled {
+    opacity: 1;
+  }
 }
 
+// Remove the dropdown arrow only from text type inputs built with datalists in Chrome.
+// See https://stackoverflow.com/a/54997118
+
+[list]:not([type="date"]):not([type="datetime-local"]):not([type="month"]):not([type="week"]):not([type="time"])::-webkit-calendar-picker-indicator {
+  display: none !important;
+}
 
 // 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 //    controls in Android 4.
 // 2. Correct the inability to style clickable types in iOS and Safari.
+// 3. Opinionated: add "hand" cursor to non-disabled button elements.
+
 button,
 [type="button"], // 1
 [type="reset"],
 [type="submit"] {
   -webkit-appearance: button; // 2
-}
 
-// Opinionated: add "hand" cursor to non-disabled button elements.
-@if $enable-pointer-cursor-for-buttons {
-  button,
-  [type="button"],
-  [type="reset"],
-  [type="submit"] {
+  @if $enable-button-pointers {
     &:not(:disabled) {
-      cursor: pointer;
+      cursor: pointer; // 3
     }
   }
 }
 
 // Remove inner border and padding from Firefox, but don't restore the outline like Normalize.
-button::-moz-focus-inner,
-[type="button"]::-moz-focus-inner,
-[type="reset"]::-moz-focus-inner,
-[type="submit"]::-moz-focus-inner {
+
+::-moz-focus-inner {
   padding: 0;
   border-style: none;
 }
 
-input[type="radio"],
-input[type="checkbox"] {
-  box-sizing: border-box; // 1. Add the correct box sizing in IE 10-
-  padding: 0; // 2. Remove the padding in IE 10-
-}
-
+// 1. Textareas should really only resize vertically so they don't break their (horizontal) containers.
 
 textarea {
-  overflow: auto; // Remove the default vertical scrollbar in IE.
-  // Textareas should really only resize vertically so they don't break their (horizontal) containers.
-  resize: vertical;
+  resize: vertical; // 1
 }
 
+// 1. Browsers set a default `min-width: min-content;` on fieldsets,
+//    unlike e.g. `<div>`s, which have `min-width: 0;` by default.
+//    So we reset that to ensure fieldsets behave more like a standard block element.
+//    See https://github.com/twbs/bootstrap/issues/12359
+//    and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements
+// 2. Reset the default outline behavior of fieldsets so they don't affect page layout.
+
 fieldset {
-  // Browsers set a default `min-width: min-content;` on fieldsets,
-  // unlike e.g. `<div>`s, which have `min-width: 0;` by default.
-  // So we reset that to ensure fieldsets behave more like a standard block element.
-  // See https://github.com/twbs/bootstrap/issues/12359
-  // and https://html.spec.whatwg.org/multipage/#the-fieldset-and-legend-elements
-  min-width: 0;
-  // Reset the default outline behavior of fieldsets so they don't affect page layout.
-  padding: 0;
-  margin: 0;
-  border: 0;
+  min-width: 0; // 1
+  padding: 0; // 2
+  margin: 0; // 2
+  border: 0; // 2
 }
 
-// 1. Correct the text wrapping in Edge and IE.
-// 2. Correct the color inheritance from `fieldset` elements in IE.
+// 1. By using `float: left`, the legend will behave like a block element.
+//    This way the border of a fieldset wraps around the legend if present.
+// 2. Fix wrapping bug.
+//    See https://github.com/twbs/bootstrap/issues/29712
+
 legend {
-  display: block;
+  float: left; // 1
   width: 100%;
-  max-width: 100%; // 1
   padding: 0;
-  margin-bottom: .5rem;
-  @include font-size(1.5rem);
+  margin-bottom: $legend-margin-bottom;
+  @include font-size($legend-font-size);
+  font-weight: $legend-font-weight;
   line-height: inherit;
-  color: inherit; // 2
-  white-space: normal; // 1
+
+  + * {
+    clear: left; // 2
+  }
 }
 
-progress {
-  vertical-align: baseline; // Add the correct vertical alignment in Chrome, Firefox, and Opera.
+// Fix height of inputs with a type of datetime-local, date, month, week, or time
+// See https://github.com/twbs/bootstrap/issues/18842
+
+::-webkit-datetime-edit-fields-wrapper,
+::-webkit-datetime-edit-text,
+::-webkit-datetime-edit-minute,
+::-webkit-datetime-edit-hour-field,
+::-webkit-datetime-edit-day-field,
+::-webkit-datetime-edit-month-field,
+::-webkit-datetime-edit-year-field {
+  padding: 0;
 }
 
-// Correct the cursor style of increment and decrement buttons in Chrome.
-[type="number"]::-webkit-inner-spin-button,
-[type="number"]::-webkit-outer-spin-button {
+::-webkit-inner-spin-button {
   height: auto;
 }
 
+// 1. This overrides the extra rounded corners on search inputs in iOS so that our
+//    `.form-control` class can properly style them. Note that this cannot simply
+//    be added to `.form-control` as it's not specific enough. For details, see
+//    https://github.com/twbs/bootstrap/issues/11586.
+// 2. Correct the outline style in Safari.
+
 [type="search"] {
-  // This overrides the extra rounded corners on search inputs in iOS so that our
-  // `.form-control` class can properly style them. Note that this cannot simply
-  // be added to `.form-control` as it's not specific enough. For details, see
-  // https://github.com/twbs/bootstrap/issues/11586.
-  outline-offset: -2px; // 2. Correct the outline style in Safari.
-  -webkit-appearance: none;
+  -webkit-appearance: textfield; // 1
+  outline-offset: -2px; // 2
 }
 
-//
+// 1. A few input types should stay LTR
+// See https://rtlstyling.com/posts/rtl-styling#form-inputs
+// 2. RTL only output
+// See https://rtlcss.com/learn/usage-guide/control-directives/#raw
+
+/* rtl:raw:
+[type="tel"],
+[type="url"],
+[type="email"],
+[type="number"] {
+  direction: ltr;
+}
+*/
+
 // Remove the inner padding in Chrome and Safari on macOS.
-//
 
-[type="search"]::-webkit-search-decoration {
+::-webkit-search-decoration {
   -webkit-appearance: none;
 }
 
-//
-// 1. Correct the inability to style clickable types in iOS and Safari.
-// 2. Change font properties to `inherit` in Safari.
-//
+// Remove padding around color pickers in webkit browsers
 
-::-webkit-file-upload-button {
-  font: inherit; // 2
-  -webkit-appearance: button; // 1
+::-webkit-color-swatch-wrapper {
+  padding: 0;
+}
+
+
+// 1. Inherit font family and line height for file input buttons
+// 2. Correct the inability to style clickable types in iOS and Safari.
+
+::file-selector-button {
+  font: inherit; // 1
+  -webkit-appearance: button; // 2
 }
 
-//
 // Correct element displays
-//
 
 output {
   display: inline-block;
 }
 
+// Remove border from iframe
+
+iframe {
+  border: 0;
+}
+
+// Summary
+//
+// 1. Add the correct display in all browsers
+
 summary {
-  display: list-item; // Add the correct display in all browsers
+  display: list-item; // 1
   cursor: pointer;
 }
 
-template {
-  display: none; // Add the correct display in IE
+
+// Progress
+//
+// Add the correct vertical alignment in Chrome, Firefox, and Opera.
+
+progress {
+  vertical-align: baseline;
 }
 
-// Always hide an element with the `hidden` HTML attribute (from PureCSS).
-// Needed for proper display in IE 10-.
+
+// Hidden attribute
+//
+// Always hide an element with the `hidden` HTML attribute.
+
 [hidden] {
   display: none !important;
 }
diff --git a/_sass/bootstrap/_root.scss b/_sass/bootstrap/_root.scss
index ad550df3b4..becddf14af 100644
--- a/_sass/bootstrap/_root.scss
+++ b/_sass/bootstrap/_root.scss
@@ -1,19 +1,187 @@
-:root {
-  // Custom variable values only support SassScript inside `#{}`.
+:root,
+[data-bs-theme="light"] {
+  // Note: Custom variable values only support SassScript inside `#{}`.
+
+  // Colors
+  //
+  // Generate palettes for full colors, grays, and theme colors.
+
   @each $color, $value in $colors {
-    --#{$color}: #{$value};
+    --#{$prefix}#{$color}: #{$value};
+  }
+
+  @each $color, $value in $grays {
+    --#{$prefix}gray-#{$color}: #{$value};
   }
 
   @each $color, $value in $theme-colors {
-    --#{$color}: #{$value};
+    --#{$prefix}#{$color}: #{$value};
+  }
+
+  @each $color, $value in $theme-colors-rgb {
+    --#{$prefix}#{$color}-rgb: #{$value};
   }
 
-  @each $bp, $value in $grid-breakpoints {
-    --breakpoint-#{$bp}: #{$value};
+  @each $color, $value in $theme-colors-text {
+    --#{$prefix}#{$color}-text-emphasis: #{$value};
   }
 
-  // Use `inspect` for lists so that quoted items keep the quotes.
+  @each $color, $value in $theme-colors-bg-subtle {
+    --#{$prefix}#{$color}-bg-subtle: #{$value};
+  }
+
+  @each $color, $value in $theme-colors-border-subtle {
+    --#{$prefix}#{$color}-border-subtle: #{$value};
+  }
+
+  --#{$prefix}white-rgb: #{to-rgb($white)};
+  --#{$prefix}black-rgb: #{to-rgb($black)};
+
+  // Fonts
+
+  // Note: Use `inspect` for lists so that quoted items keep the quotes.
   // See https://github.com/sass/sass/issues/2383#issuecomment-336349172
-  --font-family-sans-serif: #{inspect($font-family-sans-serif)};
-  --font-family-monospace: #{inspect($font-family-monospace)};
+  --#{$prefix}font-sans-serif: #{inspect($font-family-sans-serif)};
+  --#{$prefix}font-monospace: #{inspect($font-family-monospace)};
+  --#{$prefix}gradient: #{$gradient};
+
+  // Root and body
+  // scss-docs-start root-body-variables
+  @if $font-size-root != null {
+    --#{$prefix}root-font-size: #{$font-size-root};
+  }
+  --#{$prefix}body-font-family: #{inspect($font-family-base)};
+  @include rfs($font-size-base, --#{$prefix}body-font-size);
+  --#{$prefix}body-font-weight: #{$font-weight-base};
+  --#{$prefix}body-line-height: #{$line-height-base};
+  @if $body-text-align != null {
+    --#{$prefix}body-text-align: #{$body-text-align};
+  }
+
+  --#{$prefix}body-color: #{$body-color};
+  --#{$prefix}body-color-rgb: #{to-rgb($body-color)};
+  --#{$prefix}body-bg: #{$body-bg};
+  --#{$prefix}body-bg-rgb: #{to-rgb($body-bg)};
+
+  --#{$prefix}emphasis-color: #{$body-emphasis-color};
+  --#{$prefix}emphasis-color-rgb: #{to-rgb($body-emphasis-color)};
+
+  --#{$prefix}secondary-color: #{$body-secondary-color};
+  --#{$prefix}secondary-color-rgb: #{to-rgb($body-secondary-color)};
+  --#{$prefix}secondary-bg: #{$body-secondary-bg};
+  --#{$prefix}secondary-bg-rgb: #{to-rgb($body-secondary-bg)};
+
+  --#{$prefix}tertiary-color: #{$body-tertiary-color};
+  --#{$prefix}tertiary-color-rgb: #{to-rgb($body-tertiary-color)};
+  --#{$prefix}tertiary-bg: #{$body-tertiary-bg};
+  --#{$prefix}tertiary-bg-rgb: #{to-rgb($body-tertiary-bg)};
+  // scss-docs-end root-body-variables
+
+  --#{$prefix}heading-color: #{$headings-color};
+
+  --#{$prefix}link-color: #{$link-color};
+  --#{$prefix}link-color-rgb: #{to-rgb($link-color)};
+  --#{$prefix}link-decoration: #{$link-decoration};
+
+  --#{$prefix}link-hover-color: #{$link-hover-color};
+  --#{$prefix}link-hover-color-rgb: #{to-rgb($link-hover-color)};
+
+  @if $link-hover-decoration != null {
+    --#{$prefix}link-hover-decoration: #{$link-hover-decoration};
+  }
+
+  --#{$prefix}code-color: #{$code-color};
+  --#{$prefix}highlight-color: #{$mark-color};
+  --#{$prefix}highlight-bg: #{$mark-bg};
+
+  // scss-docs-start root-border-var
+  --#{$prefix}border-width: #{$border-width};
+  --#{$prefix}border-style: #{$border-style};
+  --#{$prefix}border-color: #{$border-color};
+  --#{$prefix}border-color-translucent: #{$border-color-translucent};
+
+  --#{$prefix}border-radius: #{$border-radius};
+  --#{$prefix}border-radius-sm: #{$border-radius-sm};
+  --#{$prefix}border-radius-lg: #{$border-radius-lg};
+  --#{$prefix}border-radius-xl: #{$border-radius-xl};
+  --#{$prefix}border-radius-xxl: #{$border-radius-xxl};
+  --#{$prefix}border-radius-2xl: var(--#{$prefix}border-radius-xxl); // Deprecated in v5.3.0 for consistency
+  --#{$prefix}border-radius-pill: #{$border-radius-pill};
+  // scss-docs-end root-border-var
+
+  --#{$prefix}box-shadow: #{$box-shadow};
+  --#{$prefix}box-shadow-sm: #{$box-shadow-sm};
+  --#{$prefix}box-shadow-lg: #{$box-shadow-lg};
+  --#{$prefix}box-shadow-inset: #{$box-shadow-inset};
+
+  // Focus styles
+  // scss-docs-start root-focus-variables
+  --#{$prefix}focus-ring-width: #{$focus-ring-width};
+  --#{$prefix}focus-ring-opacity: #{$focus-ring-opacity};
+  --#{$prefix}focus-ring-color: #{$focus-ring-color};
+  // scss-docs-end root-focus-variables
+
+  // scss-docs-start root-form-validation-variables
+  --#{$prefix}form-valid-color: #{$form-valid-color};
+  --#{$prefix}form-valid-border-color: #{$form-valid-border-color};
+  --#{$prefix}form-invalid-color: #{$form-invalid-color};
+  --#{$prefix}form-invalid-border-color: #{$form-invalid-border-color};
+  // scss-docs-end root-form-validation-variables
+}
+
+@if $enable-dark-mode {
+  @include color-mode(dark, true) {
+    color-scheme: dark;
+
+    // scss-docs-start root-dark-mode-vars
+    --#{$prefix}body-color: #{$body-color-dark};
+    --#{$prefix}body-color-rgb: #{to-rgb($body-color-dark)};
+    --#{$prefix}body-bg: #{$body-bg-dark};
+    --#{$prefix}body-bg-rgb: #{to-rgb($body-bg-dark)};
+
+    --#{$prefix}emphasis-color: #{$body-emphasis-color-dark};
+    --#{$prefix}emphasis-color-rgb: #{to-rgb($body-emphasis-color-dark)};
+
+    --#{$prefix}secondary-color: #{$body-secondary-color-dark};
+    --#{$prefix}secondary-color-rgb: #{to-rgb($body-secondary-color-dark)};
+    --#{$prefix}secondary-bg: #{$body-secondary-bg-dark};
+    --#{$prefix}secondary-bg-rgb: #{to-rgb($body-secondary-bg-dark)};
+
+    --#{$prefix}tertiary-color: #{$body-tertiary-color-dark};
+    --#{$prefix}tertiary-color-rgb: #{to-rgb($body-tertiary-color-dark)};
+    --#{$prefix}tertiary-bg: #{$body-tertiary-bg-dark};
+    --#{$prefix}tertiary-bg-rgb: #{to-rgb($body-tertiary-bg-dark)};
+
+    @each $color, $value in $theme-colors-text-dark {
+      --#{$prefix}#{$color}-text-emphasis: #{$value};
+    }
+
+    @each $color, $value in $theme-colors-bg-subtle-dark {
+      --#{$prefix}#{$color}-bg-subtle: #{$value};
+    }
+
+    @each $color, $value in $theme-colors-border-subtle-dark {
+      --#{$prefix}#{$color}-border-subtle: #{$value};
+    }
+
+    --#{$prefix}heading-color: #{$headings-color-dark};
+
+    --#{$prefix}link-color: #{$link-color-dark};
+    --#{$prefix}link-hover-color: #{$link-hover-color-dark};
+    --#{$prefix}link-color-rgb: #{to-rgb($link-color-dark)};
+    --#{$prefix}link-hover-color-rgb: #{to-rgb($link-hover-color-dark)};
+
+    --#{$prefix}code-color: #{$code-color-dark};
+    --#{$prefix}highlight-color: #{$mark-color-dark};
+    --#{$prefix}highlight-bg: #{$mark-bg-dark};
+
+    --#{$prefix}border-color: #{$border-color-dark};
+    --#{$prefix}border-color-translucent: #{$border-color-translucent-dark};
+
+    --#{$prefix}form-valid-color: #{$form-valid-color-dark};
+    --#{$prefix}form-valid-border-color: #{$form-valid-border-color-dark};
+    --#{$prefix}form-invalid-color: #{$form-invalid-color-dark};
+    --#{$prefix}form-invalid-border-color: #{$form-invalid-border-color-dark};
+    // scss-docs-end root-dark-mode-vars
+  }
 }
diff --git a/_sass/bootstrap/_spinners.scss b/_sass/bootstrap/_spinners.scss
index 7d8fba7a11..ec8473207e 100644
--- a/_sass/bootstrap/_spinners.scss
+++ b/_sass/bootstrap/_spinners.scss
@@ -2,32 +2,50 @@
 // Rotating border
 //
 
+.spinner-grow,
+.spinner-border {
+  display: inline-block;
+  width: var(--#{$prefix}spinner-width);
+  height: var(--#{$prefix}spinner-height);
+  vertical-align: var(--#{$prefix}spinner-vertical-align);
+  // stylelint-disable-next-line property-disallowed-list
+  border-radius: 50%;
+  animation: var(--#{$prefix}spinner-animation-speed) linear infinite var(--#{$prefix}spinner-animation-name);
+}
+
+// scss-docs-start spinner-border-keyframes
 @keyframes spinner-border {
-  to { transform: rotate(360deg); }
+  to { transform: rotate(360deg) #{"/* rtl:ignore */"}; }
 }
+// scss-docs-end spinner-border-keyframes
 
 .spinner-border {
-  display: inline-block;
-  width: $spinner-width;
-  height: $spinner-height;
-  vertical-align: text-bottom;
-  border: $spinner-border-width solid currentColor;
+  // scss-docs-start spinner-border-css-vars
+  --#{$prefix}spinner-width: #{$spinner-width};
+  --#{$prefix}spinner-height: #{$spinner-height};
+  --#{$prefix}spinner-vertical-align: #{$spinner-vertical-align};
+  --#{$prefix}spinner-border-width: #{$spinner-border-width};
+  --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed};
+  --#{$prefix}spinner-animation-name: spinner-border;
+  // scss-docs-end spinner-border-css-vars
+
+  border: var(--#{$prefix}spinner-border-width) solid currentcolor;
   border-right-color: transparent;
-  // stylelint-disable-next-line property-disallowed-list
-  border-radius: 50%;
-  animation: .75s linear infinite spinner-border;
 }
 
 .spinner-border-sm {
-  width: $spinner-width-sm;
-  height: $spinner-height-sm;
-  border-width: $spinner-border-width-sm;
+  // scss-docs-start spinner-border-sm-css-vars
+  --#{$prefix}spinner-width: #{$spinner-width-sm};
+  --#{$prefix}spinner-height: #{$spinner-height-sm};
+  --#{$prefix}spinner-border-width: #{$spinner-border-width-sm};
+  // scss-docs-end spinner-border-sm-css-vars
 }
 
 //
 // Growing circle
 //
 
+// scss-docs-start spinner-grow-keyframes
 @keyframes spinner-grow {
   0% {
     transform: scale(0);
@@ -37,29 +55,31 @@
     transform: none;
   }
 }
+// scss-docs-end spinner-grow-keyframes
 
 .spinner-grow {
-  display: inline-block;
-  width: $spinner-width;
-  height: $spinner-height;
-  vertical-align: text-bottom;
-  background-color: currentColor;
-  // stylelint-disable-next-line property-disallowed-list
-  border-radius: 50%;
+  // scss-docs-start spinner-grow-css-vars
+  --#{$prefix}spinner-width: #{$spinner-width};
+  --#{$prefix}spinner-height: #{$spinner-height};
+  --#{$prefix}spinner-vertical-align: #{$spinner-vertical-align};
+  --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed};
+  --#{$prefix}spinner-animation-name: spinner-grow;
+  // scss-docs-end spinner-grow-css-vars
+
+  background-color: currentcolor;
   opacity: 0;
-  animation: .75s linear infinite spinner-grow;
 }
 
 .spinner-grow-sm {
-  width: $spinner-width-sm;
-  height: $spinner-height-sm;
+  --#{$prefix}spinner-width: #{$spinner-width-sm};
+  --#{$prefix}spinner-height: #{$spinner-height-sm};
 }
 
-@if $enable-prefers-reduced-motion-media-query {
+@if $enable-reduced-motion {
   @media (prefers-reduced-motion: reduce) {
     .spinner-border,
     .spinner-grow {
-      animation-duration: 1.5s;
+      --#{$prefix}spinner-animation-speed: #{$spinner-animation-speed * 2};
     }
   }
 }
diff --git a/_sass/bootstrap/_tables.scss b/_sass/bootstrap/_tables.scss
index 5fd77a4eb0..ebfc00a5c6 100644
--- a/_sass/bootstrap/_tables.scss
+++ b/_sass/bootstrap/_tables.scss
@@ -3,37 +3,72 @@
 //
 
 .table {
+  // Reset needed for nesting tables
+  --#{$prefix}table-color-type: initial;
+  --#{$prefix}table-bg-type: initial;
+  --#{$prefix}table-color-state: initial;
+  --#{$prefix}table-bg-state: initial;
+  // End of reset
+  --#{$prefix}table-color: #{$table-color};
+  --#{$prefix}table-bg: #{$table-bg};
+  --#{$prefix}table-border-color: #{$table-border-color};
+  --#{$prefix}table-accent-bg: #{$table-accent-bg};
+  --#{$prefix}table-striped-color: #{$table-striped-color};
+  --#{$prefix}table-striped-bg: #{$table-striped-bg};
+  --#{$prefix}table-active-color: #{$table-active-color};
+  --#{$prefix}table-active-bg: #{$table-active-bg};
+  --#{$prefix}table-hover-color: #{$table-hover-color};
+  --#{$prefix}table-hover-bg: #{$table-hover-bg};
+
   width: 100%;
   margin-bottom: $spacer;
-  color: $table-color;
-  background-color: $table-bg; // Reset for nesting within parents with `background-color`.
-
-  th,
-  td {
-    padding: $table-cell-padding;
-    vertical-align: top;
-    border-top: $table-border-width solid $table-border-color;
+  vertical-align: $table-cell-vertical-align;
+  border-color: var(--#{$prefix}table-border-color);
+
+  // Target th & td
+  // We need the child combinator to prevent styles leaking to nested tables which doesn't have a `.table` class.
+  // We use the universal selectors here to simplify the selector (else we would need 6 different selectors).
+  // Another advantage is that this generates less code and makes the selector less specific making it easier to override.
+  // stylelint-disable-next-line selector-max-universal
+  > :not(caption) > * > * {
+    padding: $table-cell-padding-y $table-cell-padding-x;
+    // Following the precept of cascades: https://codepen.io/miriamsuzanne/full/vYNgodb
+    color: var(--#{$prefix}table-color-state, var(--#{$prefix}table-color-type, var(--#{$prefix}table-color)));
+    background-color: var(--#{$prefix}table-bg);
+    border-bottom-width: $table-border-width;
+    box-shadow: inset 0 0 0 9999px var(--#{$prefix}table-bg-state, var(--#{$prefix}table-bg-type, var(--#{$prefix}table-accent-bg)));
   }
 
-  thead th {
-    vertical-align: bottom;
-    border-bottom: (2 * $table-border-width) solid $table-border-color;
+  > tbody {
+    vertical-align: inherit;
   }
 
-  tbody + tbody {
-    border-top: (2 * $table-border-width) solid $table-border-color;
+  > thead {
+    vertical-align: bottom;
   }
 }
 
+.table-group-divider {
+  border-top: calc(#{$table-border-width} * 2) solid $table-group-separator-color; // stylelint-disable-line function-disallowed-list
+}
+
+//
+// Change placement of captions with a class
+//
+
+.caption-top {
+  caption-side: top;
+}
+
 
 //
 // Condensed table w/ half padding
 //
 
 .table-sm {
-  th,
-  td {
-    padding: $table-cell-padding-sm;
+  // stylelint-disable-next-line selector-max-universal
+  > :not(caption) > * > * {
+    padding: $table-cell-padding-y-sm $table-cell-padding-x-sm;
   }
 }
 
@@ -41,29 +76,31 @@
 // Border versions
 //
 // Add or remove borders all around the table and between all the columns.
+//
+// When borders are added on all sides of the cells, the corners can render odd when
+// these borders do not have the same color or if they are semi-transparent.
+// Therefor we add top and border bottoms to the `tr`s and left and right borders
+// to the `td`s or `th`s
 
 .table-bordered {
-  border: $table-border-width solid $table-border-color;
+  > :not(caption) > * {
+    border-width: $table-border-width 0;
 
-  th,
-  td {
-    border: $table-border-width solid $table-border-color;
-  }
-
-  thead {
-    th,
-    td {
-      border-bottom-width: 2 * $table-border-width;
+    // stylelint-disable-next-line selector-max-universal
+    > * {
+      border-width: 0 $table-border-width;
     }
   }
 }
 
 .table-borderless {
-  th,
-  td,
-  thead th,
-  tbody + tbody {
-    border: 0;
+  // stylelint-disable-next-line selector-max-universal
+  > :not(caption) > * > * {
+    border-bottom-width: 0;
+  }
+
+  > :not(:first-child) {
+    border-top-width: 0;
   }
 }
 
@@ -71,115 +108,64 @@
 //
 // Default zebra-stripe styles (alternating gray and transparent backgrounds)
 
+// For rows
 .table-striped {
-  tbody tr:nth-of-type(#{$table-striped-order}) {
-    background-color: $table-accent-bg;
+  > tbody > tr:nth-of-type(#{$table-striped-order}) > * {
+    --#{$prefix}table-color-type: var(--#{$prefix}table-striped-color);
+    --#{$prefix}table-bg-type: var(--#{$prefix}table-striped-bg);
   }
 }
 
-
-// Hover effect
-//
-// Placed here since it has to come after the potential zebra striping
-
-.table-hover {
-  tbody tr {
-    @include hover() {
-      color: $table-hover-color;
-      background-color: $table-hover-bg;
-    }
+// For columns
+.table-striped-columns {
+  > :not(caption) > tr > :nth-child(#{$table-striped-columns-order}) {
+    --#{$prefix}table-color-type: var(--#{$prefix}table-striped-color);
+    --#{$prefix}table-bg-type: var(--#{$prefix}table-striped-bg);
   }
 }
 
-
-// Table backgrounds
+// Active table
 //
-// Exact selectors below required to override `.table-striped` and prevent
-// inheritance to nested tables.
+// The `.table-active` class can be added to highlight rows or cells
 
-@each $color, $value in $theme-colors {
-  @include table-row-variant($color, theme-color-level($color, $table-bg-level), theme-color-level($color, $table-border-level));
+.table-active {
+  --#{$prefix}table-color-state: var(--#{$prefix}table-active-color);
+  --#{$prefix}table-bg-state: var(--#{$prefix}table-active-bg);
 }
 
-@include table-row-variant(active, $table-active-bg);
-
-
-// Dark styles
+// Hover effect
 //
-// Same table markup, but inverted color scheme: dark background and light text.
-
-// stylelint-disable-next-line no-duplicate-selectors
-.table {
-  .thead-dark {
-    th {
-      color: $table-dark-color;
-      background-color: $table-dark-bg;
-      border-color: $table-dark-border-color;
-    }
-  }
+// Placed here since it has to come after the potential zebra striping
 
-  .thead-light {
-    th {
-      color: $table-head-color;
-      background-color: $table-head-bg;
-      border-color: $table-border-color;
-    }
+.table-hover {
+  > tbody > tr:hover > * {
+    --#{$prefix}table-color-state: var(--#{$prefix}table-hover-color);
+    --#{$prefix}table-bg-state: var(--#{$prefix}table-hover-bg);
   }
 }
 
-.table-dark {
-  color: $table-dark-color;
-  background-color: $table-dark-bg;
 
-  th,
-  td,
-  thead th {
-    border-color: $table-dark-border-color;
-  }
-
-  &.table-bordered {
-    border: 0;
-  }
-
-  &.table-striped {
-    tbody tr:nth-of-type(#{$table-striped-order}) {
-      background-color: $table-dark-accent-bg;
-    }
-  }
+// Table variants
+//
+// Table variants set the table cell backgrounds, border colors
+// and the colors of the striped, hovered & active tables
 
-  &.table-hover {
-    tbody tr {
-      @include hover() {
-        color: $table-dark-hover-color;
-        background-color: $table-dark-hover-bg;
-      }
-    }
-  }
+@each $color, $value in $table-variants {
+  @include table-variant($color, $value);
 }
 
-
 // Responsive tables
 //
 // Generate series of `.table-responsive-*` classes for configuring the screen
 // size of where your table will overflow.
 
-.table-responsive {
-  @each $breakpoint in map-keys($grid-breakpoints) {
-    $next: breakpoint-next($breakpoint, $grid-breakpoints);
-    $infix: breakpoint-infix($next, $grid-breakpoints);
-
-    &#{$infix} {
-      @include media-breakpoint-down($breakpoint) {
-        display: block;
-        width: 100%;
-        overflow-x: auto;
-        -webkit-overflow-scrolling: touch;
-
-        // Prevent double border on horizontal scroll due to use of `display: block;`
-        > .table-bordered {
-          border: 0;
-        }
-      }
+@each $breakpoint in map-keys($grid-breakpoints) {
+  $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+  @include media-breakpoint-down($breakpoint) {
+    .table-responsive#{$infix} {
+      overflow-x: auto;
+      -webkit-overflow-scrolling: touch;
     }
   }
 }
diff --git a/_sass/bootstrap/_toasts.scss b/_sass/bootstrap/_toasts.scss
index f9ca8d91cd..2ce378d5bc 100644
--- a/_sass/bootstrap/_toasts.scss
+++ b/_sass/bootstrap/_toasts.scss
@@ -1,46 +1,73 @@
 .toast {
-  // Prevents from shrinking in IE11, when in a flex container
-  // See https://github.com/twbs/bootstrap/issues/28341
-  flex-basis: $toast-max-width;
-  max-width: $toast-max-width;
-  @include font-size($toast-font-size);
-  color: $toast-color;
-  background-color: $toast-background-color;
-  background-clip: padding-box;
-  border: $toast-border-width solid $toast-border-color;
-  box-shadow: $toast-box-shadow;
-  opacity: 0;
-  @include border-radius($toast-border-radius);
+  // scss-docs-start toast-css-vars
+  --#{$prefix}toast-zindex: #{$zindex-toast};
+  --#{$prefix}toast-padding-x: #{$toast-padding-x};
+  --#{$prefix}toast-padding-y: #{$toast-padding-y};
+  --#{$prefix}toast-spacing: #{$toast-spacing};
+  --#{$prefix}toast-max-width: #{$toast-max-width};
+  @include rfs($toast-font-size, --#{$prefix}toast-font-size);
+  --#{$prefix}toast-color: #{$toast-color};
+  --#{$prefix}toast-bg: #{$toast-background-color};
+  --#{$prefix}toast-border-width: #{$toast-border-width};
+  --#{$prefix}toast-border-color: #{$toast-border-color};
+  --#{$prefix}toast-border-radius: #{$toast-border-radius};
+  --#{$prefix}toast-box-shadow: #{$toast-box-shadow};
+  --#{$prefix}toast-header-color: #{$toast-header-color};
+  --#{$prefix}toast-header-bg: #{$toast-header-background-color};
+  --#{$prefix}toast-header-border-color: #{$toast-header-border-color};
+  // scss-docs-end toast-css-vars
 
-  &:not(:last-child) {
-    margin-bottom: $toast-padding-x;
-  }
+  width: var(--#{$prefix}toast-max-width);
+  max-width: 100%;
+  @include font-size(var(--#{$prefix}toast-font-size));
+  color: var(--#{$prefix}toast-color);
+  pointer-events: auto;
+  background-color: var(--#{$prefix}toast-bg);
+  background-clip: padding-box;
+  border: var(--#{$prefix}toast-border-width) solid var(--#{$prefix}toast-border-color);
+  box-shadow: var(--#{$prefix}toast-box-shadow);
+  @include border-radius(var(--#{$prefix}toast-border-radius));
 
   &.showing {
-    opacity: 1;
+    opacity: 0;
   }
 
-  &.show {
-    display: block;
-    opacity: 1;
+  &:not(.show) {
+    display: none;
   }
+}
 
-  &.hide {
-    display: none;
+.toast-container {
+  --#{$prefix}toast-zindex: #{$zindex-toast};
+
+  position: absolute;
+  z-index: var(--#{$prefix}toast-zindex);
+  width: max-content;
+  max-width: 100%;
+  pointer-events: none;
+
+  > :not(:last-child) {
+    margin-bottom: var(--#{$prefix}toast-spacing);
   }
 }
 
 .toast-header {
   display: flex;
   align-items: center;
-  padding: $toast-padding-y $toast-padding-x;
-  color: $toast-header-color;
-  background-color: $toast-header-background-color;
+  padding: var(--#{$prefix}toast-padding-y) var(--#{$prefix}toast-padding-x);
+  color: var(--#{$prefix}toast-header-color);
+  background-color: var(--#{$prefix}toast-header-bg);
   background-clip: padding-box;
-  border-bottom: $toast-border-width solid $toast-header-border-color;
-  @include border-top-radius(subtract($toast-border-radius, $toast-border-width));
+  border-bottom: var(--#{$prefix}toast-border-width) solid var(--#{$prefix}toast-header-border-color);
+  @include border-top-radius(calc(var(--#{$prefix}toast-border-radius) - var(--#{$prefix}toast-border-width)));
+
+  .btn-close {
+    margin-right: calc(-.5 * var(--#{$prefix}toast-padding-x)); // stylelint-disable-line function-disallowed-list
+    margin-left: var(--#{$prefix}toast-padding-x);
+  }
 }
 
 .toast-body {
-  padding: $toast-padding-x; // apply to both vertical and horizontal
+  padding: var(--#{$prefix}toast-padding-x);
+  word-wrap: break-word;
 }
diff --git a/_sass/bootstrap/_tooltip.scss b/_sass/bootstrap/_tooltip.scss
index 6b3aa62dd6..85de90f53d 100644
--- a/_sass/bootstrap/_tooltip.scss
+++ b/_sass/bootstrap/_tooltip.scss
@@ -1,24 +1,38 @@
 // Base class
 .tooltip {
-  position: absolute;
-  z-index: $zindex-tooltip;
+  // scss-docs-start tooltip-css-vars
+  --#{$prefix}tooltip-zindex: #{$zindex-tooltip};
+  --#{$prefix}tooltip-max-width: #{$tooltip-max-width};
+  --#{$prefix}tooltip-padding-x: #{$tooltip-padding-x};
+  --#{$prefix}tooltip-padding-y: #{$tooltip-padding-y};
+  --#{$prefix}tooltip-margin: #{$tooltip-margin};
+  @include rfs($tooltip-font-size, --#{$prefix}tooltip-font-size);
+  --#{$prefix}tooltip-color: #{$tooltip-color};
+  --#{$prefix}tooltip-bg: #{$tooltip-bg};
+  --#{$prefix}tooltip-border-radius: #{$tooltip-border-radius};
+  --#{$prefix}tooltip-opacity: #{$tooltip-opacity};
+  --#{$prefix}tooltip-arrow-width: #{$tooltip-arrow-width};
+  --#{$prefix}tooltip-arrow-height: #{$tooltip-arrow-height};
+  // scss-docs-end tooltip-css-vars
+
+  z-index: var(--#{$prefix}tooltip-zindex);
   display: block;
-  margin: $tooltip-margin;
+  margin: var(--#{$prefix}tooltip-margin);
+  @include deprecate("`$tooltip-margin`", "v5", "v5.x", true);
   // Our parent element can be arbitrary since tooltips are by default inserted as a sibling of their target element.
   // So reset our font and text properties to avoid inheriting weird values.
   @include reset-text();
-  @include font-size($tooltip-font-size);
+  @include font-size(var(--#{$prefix}tooltip-font-size));
   // Allow breaking very long words so they don't overflow the tooltip's bounds
   word-wrap: break-word;
   opacity: 0;
 
-  &.show { opacity: $tooltip-opacity; }
+  &.show { opacity: var(--#{$prefix}tooltip-opacity); }
 
-  .arrow {
-    position: absolute;
+  .tooltip-arrow {
     display: block;
-    width: $tooltip-arrow-width;
-    height: $tooltip-arrow-height;
+    width: var(--#{$prefix}tooltip-arrow-width);
+    height: var(--#{$prefix}tooltip-arrow-height);
 
     &::before {
       position: absolute;
@@ -29,87 +43,77 @@
   }
 }
 
-.bs-tooltip-top {
-  padding: $tooltip-arrow-height 0;
+.bs-tooltip-top .tooltip-arrow {
+  bottom: calc(-1 * var(--#{$prefix}tooltip-arrow-height)); // stylelint-disable-line function-disallowed-list
 
-  .arrow {
-    bottom: 0;
-
-    &::before {
-      top: 0;
-      border-width: $tooltip-arrow-height ($tooltip-arrow-width / 2) 0;
-      border-top-color: $tooltip-arrow-color;
-    }
+  &::before {
+    top: -1px;
+    border-width: var(--#{$prefix}tooltip-arrow-height) calc(var(--#{$prefix}tooltip-arrow-width) * .5) 0; // stylelint-disable-line function-disallowed-list
+    border-top-color: var(--#{$prefix}tooltip-bg);
   }
 }
 
-.bs-tooltip-right {
-  padding: 0 $tooltip-arrow-height;
+/* rtl:begin:ignore */
+.bs-tooltip-end .tooltip-arrow {
+  left: calc(-1 * var(--#{$prefix}tooltip-arrow-height)); // stylelint-disable-line function-disallowed-list
+  width: var(--#{$prefix}tooltip-arrow-height);
+  height: var(--#{$prefix}tooltip-arrow-width);
 
-  .arrow {
-    left: 0;
-    width: $tooltip-arrow-height;
-    height: $tooltip-arrow-width;
-
-    &::before {
-      right: 0;
-      border-width: ($tooltip-arrow-width / 2) $tooltip-arrow-height ($tooltip-arrow-width / 2) 0;
-      border-right-color: $tooltip-arrow-color;
-    }
+  &::before {
+    right: -1px;
+    border-width: calc(var(--#{$prefix}tooltip-arrow-width) * .5) var(--#{$prefix}tooltip-arrow-height) calc(var(--#{$prefix}tooltip-arrow-width) * .5) 0; // stylelint-disable-line function-disallowed-list
+    border-right-color: var(--#{$prefix}tooltip-bg);
   }
 }
 
-.bs-tooltip-bottom {
-  padding: $tooltip-arrow-height 0;
+/* rtl:end:ignore */
 
-  .arrow {
-    top: 0;
+.bs-tooltip-bottom .tooltip-arrow {
+  top: calc(-1 * var(--#{$prefix}tooltip-arrow-height)); // stylelint-disable-line function-disallowed-list
 
-    &::before {
-      bottom: 0;
-      border-width: 0 ($tooltip-arrow-width / 2) $tooltip-arrow-height;
-      border-bottom-color: $tooltip-arrow-color;
-    }
+  &::before {
+    bottom: -1px;
+    border-width: 0 calc(var(--#{$prefix}tooltip-arrow-width) * .5) var(--#{$prefix}tooltip-arrow-height); // stylelint-disable-line function-disallowed-list
+    border-bottom-color: var(--#{$prefix}tooltip-bg);
   }
 }
 
-.bs-tooltip-left {
-  padding: 0 $tooltip-arrow-height;
-
-  .arrow {
-    right: 0;
-    width: $tooltip-arrow-height;
-    height: $tooltip-arrow-width;
+/* rtl:begin:ignore */
+.bs-tooltip-start .tooltip-arrow {
+  right: calc(-1 * var(--#{$prefix}tooltip-arrow-height)); // stylelint-disable-line function-disallowed-list
+  width: var(--#{$prefix}tooltip-arrow-height);
+  height: var(--#{$prefix}tooltip-arrow-width);
 
-    &::before {
-      left: 0;
-      border-width: ($tooltip-arrow-width / 2) 0 ($tooltip-arrow-width / 2) $tooltip-arrow-height;
-      border-left-color: $tooltip-arrow-color;
-    }
+  &::before {
+    left: -1px;
+    border-width: calc(var(--#{$prefix}tooltip-arrow-width) * .5) 0 calc(var(--#{$prefix}tooltip-arrow-width) * .5) var(--#{$prefix}tooltip-arrow-height); // stylelint-disable-line function-disallowed-list
+    border-left-color: var(--#{$prefix}tooltip-bg);
   }
 }
 
+/* rtl:end:ignore */
+
 .bs-tooltip-auto {
-  &[x-placement^="top"] {
+  &[data-popper-placement^="top"] {
     @extend .bs-tooltip-top;
   }
-  &[x-placement^="right"] {
-    @extend .bs-tooltip-right;
+  &[data-popper-placement^="right"] {
+    @extend .bs-tooltip-end;
   }
-  &[x-placement^="bottom"] {
+  &[data-popper-placement^="bottom"] {
     @extend .bs-tooltip-bottom;
   }
-  &[x-placement^="left"] {
-    @extend .bs-tooltip-left;
+  &[data-popper-placement^="left"] {
+    @extend .bs-tooltip-start;
   }
 }
 
 // Wrapper for the tooltip content
 .tooltip-inner {
-  max-width: $tooltip-max-width;
-  padding: $tooltip-padding-y $tooltip-padding-x;
-  color: $tooltip-color;
+  max-width: var(--#{$prefix}tooltip-max-width);
+  padding: var(--#{$prefix}tooltip-padding-y) var(--#{$prefix}tooltip-padding-x);
+  color: var(--#{$prefix}tooltip-color);
   text-align: center;
-  background-color: $tooltip-bg;
-  @include border-radius($tooltip-border-radius);
+  background-color: var(--#{$prefix}tooltip-bg);
+  @include border-radius(var(--#{$prefix}tooltip-border-radius));
 }
diff --git a/_sass/bootstrap/_transitions.scss b/_sass/bootstrap/_transitions.scss
index 40be4d918a..bfb26aa8ac 100644
--- a/_sass/bootstrap/_transitions.scss
+++ b/_sass/bootstrap/_transitions.scss
@@ -6,6 +6,7 @@
   }
 }
 
+// scss-docs-start collapse-classes
 .collapse {
   &:not(.show) {
     display: none;
@@ -13,8 +14,14 @@
 }
 
 .collapsing {
-  position: relative;
   height: 0;
   overflow: hidden;
   @include transition($transition-collapse);
+
+  &.collapse-horizontal {
+    width: 0;
+    height: auto;
+    @include transition($transition-collapse-width);
+  }
 }
+// scss-docs-end collapse-classes
diff --git a/_sass/bootstrap/_type.scss b/_sass/bootstrap/_type.scss
index 3112a734bb..37d64bf89c 100644
--- a/_sass/bootstrap/_type.scss
+++ b/_sass/bootstrap/_type.scss
@@ -1,82 +1,58 @@
-// stylelint-disable selector-list-comma-newline-after
-
 //
 // Headings
 //
-
-h1, h2, h3, h4, h5, h6,
-.h1, .h2, .h3, .h4, .h5, .h6 {
-  margin-bottom: $headings-margin-bottom;
-  font-family: $headings-font-family;
-  font-weight: $headings-font-weight;
-  line-height: $headings-line-height;
-  color: $headings-color;
+.h1 {
+  @extend h1;
 }
 
-h1, .h1 { @include font-size($h1-font-size); }
-h2, .h2 { @include font-size($h2-font-size); }
-h3, .h3 { @include font-size($h3-font-size); }
-h4, .h4 { @include font-size($h4-font-size); }
-h5, .h5 { @include font-size($h5-font-size); }
-h6, .h6 { @include font-size($h6-font-size); }
-
-.lead {
-  @include font-size($lead-font-size);
-  font-weight: $lead-font-weight;
+.h2 {
+  @extend h2;
 }
 
-// Type display classes
-.display-1 {
-  @include font-size($display1-size);
-  font-weight: $display1-weight;
-  line-height: $display-line-height;
+.h3 {
+  @extend h3;
 }
-.display-2 {
-  @include font-size($display2-size);
-  font-weight: $display2-weight;
-  line-height: $display-line-height;
+
+.h4 {
+  @extend h4;
 }
-.display-3 {
-  @include font-size($display3-size);
-  font-weight: $display3-weight;
-  line-height: $display-line-height;
+
+.h5 {
+  @extend h5;
 }
-.display-4 {
-  @include font-size($display4-size);
-  font-weight: $display4-weight;
-  line-height: $display-line-height;
+
+.h6 {
+  @extend h6;
 }
 
 
-//
-// Horizontal rules
-//
-
-hr {
-  margin-top: $hr-margin-y;
-  margin-bottom: $hr-margin-y;
-  border: 0;
-  border-top: $hr-border-width solid $hr-border-color;
+.lead {
+  @include font-size($lead-font-size);
+  font-weight: $lead-font-weight;
 }
 
+// Type display classes
+@each $display, $font-size in $display-font-sizes {
+  .display-#{$display} {
+    @include font-size($font-size);
+    font-family: $display-font-family;
+    font-style: $display-font-style;
+    font-weight: $display-font-weight;
+    line-height: $display-line-height;
+  }
+}
 
 //
 // Emphasis
 //
-
-small,
 .small {
-  @include font-size($small-font-size);
-  font-weight: $font-weight-normal;
+  @extend small;
 }
 
-mark,
 .mark {
-  padding: $mark-padding;
-  background-color: $mark-bg;
+  @extend mark;
 }
 
-
 //
 // Lists
 //
@@ -104,20 +80,25 @@ mark,
 
 // Builds on `abbr`
 .initialism {
-  @include font-size(90%);
+  @include font-size($initialism-font-size);
   text-transform: uppercase;
 }
 
 // Blockquotes
 .blockquote {
-  margin-bottom: $spacer;
+  margin-bottom: $blockquote-margin-y;
   @include font-size($blockquote-font-size);
+
+  > :last-child {
+    margin-bottom: 0;
+  }
 }
 
 .blockquote-footer {
-  display: block;
-  @include font-size($blockquote-small-font-size);
-  color: $blockquote-small-color;
+  margin-top: -$blockquote-margin-y;
+  margin-bottom: $blockquote-margin-y;
+  @include font-size($blockquote-footer-font-size);
+  color: $blockquote-footer-color;
 
   &::before {
     content: "\2014\00A0"; // em dash, nbsp
diff --git a/_sass/bootstrap/_utilities.scss b/_sass/bootstrap/_utilities.scss
index 10e31dd7e9..696f906ec9 100644
--- a/_sass/bootstrap/_utilities.scss
+++ b/_sass/bootstrap/_utilities.scss
@@ -1,18 +1,806 @@
-@import "utilities/align";
-@import "utilities/background";
-@import "utilities/borders";
-@import "utilities/clearfix";
-@import "utilities/display";
-@import "utilities/embed";
-@import "utilities/flex";
-@import "utilities/float";
-@import "utilities/interactions";
-@import "utilities/overflow";
-@import "utilities/position";
-@import "utilities/screenreaders";
-@import "utilities/shadows";
-@import "utilities/sizing";
-@import "utilities/spacing";
-@import "utilities/stretched-link";
-@import "utilities/text";
-@import "utilities/visibility";
+// Utilities
+
+$utilities: () !default;
+// stylelint-disable-next-line scss/dollar-variable-default
+$utilities: map-merge(
+  (
+    // scss-docs-start utils-vertical-align
+    "align": (
+      property: vertical-align,
+      class: align,
+      values: baseline top middle bottom text-bottom text-top
+    ),
+    // scss-docs-end utils-vertical-align
+    // scss-docs-start utils-float
+    "float": (
+      responsive: true,
+      property: float,
+      values: (
+        start: left,
+        end: right,
+        none: none,
+      )
+    ),
+    // scss-docs-end utils-float
+    // Object Fit utilities
+    // scss-docs-start utils-object-fit
+    "object-fit": (
+      responsive: true,
+      property: object-fit,
+      values: (
+        contain: contain,
+        cover: cover,
+        fill: fill,
+        scale: scale-down,
+        none: none,
+      )
+    ),
+    // scss-docs-end utils-object-fit
+    // Opacity utilities
+    // scss-docs-start utils-opacity
+    "opacity": (
+      property: opacity,
+      values: (
+        0: 0,
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1,
+      )
+    ),
+    // scss-docs-end utils-opacity
+    // scss-docs-start utils-overflow
+    "overflow": (
+      property: overflow,
+      values: auto hidden visible scroll,
+    ),
+    "overflow-x": (
+      property: overflow-x,
+      values: auto hidden visible scroll,
+    ),
+    "overflow-y": (
+      property: overflow-y,
+      values: auto hidden visible scroll,
+    ),
+    // scss-docs-end utils-overflow
+    // scss-docs-start utils-display
+    "display": (
+      responsive: true,
+      print: true,
+      property: display,
+      class: d,
+      values: inline inline-block block grid inline-grid table table-row table-cell flex inline-flex none
+    ),
+    // scss-docs-end utils-display
+    // scss-docs-start utils-shadow
+    "shadow": (
+      property: box-shadow,
+      class: shadow,
+      values: (
+        null: var(--#{$prefix}box-shadow),
+        sm: var(--#{$prefix}box-shadow-sm),
+        lg: var(--#{$prefix}box-shadow-lg),
+        none: none,
+      )
+    ),
+    // scss-docs-end utils-shadow
+    // scss-docs-start utils-focus-ring
+    "focus-ring": (
+      css-var: true,
+      css-variable-name: focus-ring-color,
+      class: focus-ring,
+      values: map-loop($theme-colors-rgb, rgba-css-var, "$key", "focus-ring")
+    ),
+    // scss-docs-end utils-focus-ring
+    // scss-docs-start utils-position
+    "position": (
+      property: position,
+      values: static relative absolute fixed sticky
+    ),
+    "top": (
+      property: top,
+      values: $position-values
+    ),
+    "bottom": (
+      property: bottom,
+      values: $position-values
+    ),
+    "start": (
+      property: left,
+      class: start,
+      values: $position-values
+    ),
+    "end": (
+      property: right,
+      class: end,
+      values: $position-values
+    ),
+    "translate-middle": (
+      property: transform,
+      class: translate-middle,
+      values: (
+        null: translate(-50%, -50%),
+        x: translateX(-50%),
+        y: translateY(-50%),
+      )
+    ),
+    // scss-docs-end utils-position
+    // scss-docs-start utils-borders
+    "border": (
+      property: border,
+      values: (
+        null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
+        0: 0,
+      )
+    ),
+    "border-top": (
+      property: border-top,
+      values: (
+        null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
+        0: 0,
+      )
+    ),
+    "border-end": (
+      property: border-right,
+      class: border-end,
+      values: (
+        null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
+        0: 0,
+      )
+    ),
+    "border-bottom": (
+      property: border-bottom,
+      values: (
+        null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
+        0: 0,
+      )
+    ),
+    "border-start": (
+      property: border-left,
+      class: border-start,
+      values: (
+        null: var(--#{$prefix}border-width) var(--#{$prefix}border-style) var(--#{$prefix}border-color),
+        0: 0,
+      )
+    ),
+    "border-color": (
+      property: border-color,
+      class: border,
+      local-vars: (
+        "border-opacity": 1
+      ),
+      values: $utilities-border-colors
+    ),
+    "subtle-border-color": (
+      property: border-color,
+      class: border,
+      values: $utilities-border-subtle
+    ),
+    "border-width": (
+      property: border-width,
+      class: border,
+      values: $border-widths
+    ),
+    "border-opacity": (
+      css-var: true,
+      class: border-opacity,
+      values: (
+        10: .1,
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1
+      )
+    ),
+    // scss-docs-end utils-borders
+    // Sizing utilities
+    // scss-docs-start utils-sizing
+    "width": (
+      property: width,
+      class: w,
+      values: (
+        25: 25%,
+        50: 50%,
+        75: 75%,
+        100: 100%,
+        auto: auto
+      )
+    ),
+    "max-width": (
+      property: max-width,
+      class: mw,
+      values: (100: 100%)
+    ),
+    "viewport-width": (
+      property: width,
+      class: vw,
+      values: (100: 100vw)
+    ),
+    "min-viewport-width": (
+      property: min-width,
+      class: min-vw,
+      values: (100: 100vw)
+    ),
+    "height": (
+      property: height,
+      class: h,
+      values: (
+        25: 25%,
+        50: 50%,
+        75: 75%,
+        100: 100%,
+        auto: auto
+      )
+    ),
+    "max-height": (
+      property: max-height,
+      class: mh,
+      values: (100: 100%)
+    ),
+    "viewport-height": (
+      property: height,
+      class: vh,
+      values: (100: 100vh)
+    ),
+    "min-viewport-height": (
+      property: min-height,
+      class: min-vh,
+      values: (100: 100vh)
+    ),
+    // scss-docs-end utils-sizing
+    // Flex utilities
+    // scss-docs-start utils-flex
+    "flex": (
+      responsive: true,
+      property: flex,
+      values: (fill: 1 1 auto)
+    ),
+    "flex-direction": (
+      responsive: true,
+      property: flex-direction,
+      class: flex,
+      values: row column row-reverse column-reverse
+    ),
+    "flex-grow": (
+      responsive: true,
+      property: flex-grow,
+      class: flex,
+      values: (
+        grow-0: 0,
+        grow-1: 1,
+      )
+    ),
+    "flex-shrink": (
+      responsive: true,
+      property: flex-shrink,
+      class: flex,
+      values: (
+        shrink-0: 0,
+        shrink-1: 1,
+      )
+    ),
+    "flex-wrap": (
+      responsive: true,
+      property: flex-wrap,
+      class: flex,
+      values: wrap nowrap wrap-reverse
+    ),
+    "justify-content": (
+      responsive: true,
+      property: justify-content,
+      values: (
+        start: flex-start,
+        end: flex-end,
+        center: center,
+        between: space-between,
+        around: space-around,
+        evenly: space-evenly,
+      )
+    ),
+    "align-items": (
+      responsive: true,
+      property: align-items,
+      values: (
+        start: flex-start,
+        end: flex-end,
+        center: center,
+        baseline: baseline,
+        stretch: stretch,
+      )
+    ),
+    "align-content": (
+      responsive: true,
+      property: align-content,
+      values: (
+        start: flex-start,
+        end: flex-end,
+        center: center,
+        between: space-between,
+        around: space-around,
+        stretch: stretch,
+      )
+    ),
+    "align-self": (
+      responsive: true,
+      property: align-self,
+      values: (
+        auto: auto,
+        start: flex-start,
+        end: flex-end,
+        center: center,
+        baseline: baseline,
+        stretch: stretch,
+      )
+    ),
+    "order": (
+      responsive: true,
+      property: order,
+      values: (
+        first: -1,
+        0: 0,
+        1: 1,
+        2: 2,
+        3: 3,
+        4: 4,
+        5: 5,
+        last: 6,
+      ),
+    ),
+    // scss-docs-end utils-flex
+    // Margin utilities
+    // scss-docs-start utils-spacing
+    "margin": (
+      responsive: true,
+      property: margin,
+      class: m,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-x": (
+      responsive: true,
+      property: margin-right margin-left,
+      class: mx,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-y": (
+      responsive: true,
+      property: margin-top margin-bottom,
+      class: my,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-top": (
+      responsive: true,
+      property: margin-top,
+      class: mt,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-end": (
+      responsive: true,
+      property: margin-right,
+      class: me,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-bottom": (
+      responsive: true,
+      property: margin-bottom,
+      class: mb,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    "margin-start": (
+      responsive: true,
+      property: margin-left,
+      class: ms,
+      values: map-merge($spacers, (auto: auto))
+    ),
+    // Negative margin utilities
+    "negative-margin": (
+      responsive: true,
+      property: margin,
+      class: m,
+      values: $negative-spacers
+    ),
+    "negative-margin-x": (
+      responsive: true,
+      property: margin-right margin-left,
+      class: mx,
+      values: $negative-spacers
+    ),
+    "negative-margin-y": (
+      responsive: true,
+      property: margin-top margin-bottom,
+      class: my,
+      values: $negative-spacers
+    ),
+    "negative-margin-top": (
+      responsive: true,
+      property: margin-top,
+      class: mt,
+      values: $negative-spacers
+    ),
+    "negative-margin-end": (
+      responsive: true,
+      property: margin-right,
+      class: me,
+      values: $negative-spacers
+    ),
+    "negative-margin-bottom": (
+      responsive: true,
+      property: margin-bottom,
+      class: mb,
+      values: $negative-spacers
+    ),
+    "negative-margin-start": (
+      responsive: true,
+      property: margin-left,
+      class: ms,
+      values: $negative-spacers
+    ),
+    // Padding utilities
+    "padding": (
+      responsive: true,
+      property: padding,
+      class: p,
+      values: $spacers
+    ),
+    "padding-x": (
+      responsive: true,
+      property: padding-right padding-left,
+      class: px,
+      values: $spacers
+    ),
+    "padding-y": (
+      responsive: true,
+      property: padding-top padding-bottom,
+      class: py,
+      values: $spacers
+    ),
+    "padding-top": (
+      responsive: true,
+      property: padding-top,
+      class: pt,
+      values: $spacers
+    ),
+    "padding-end": (
+      responsive: true,
+      property: padding-right,
+      class: pe,
+      values: $spacers
+    ),
+    "padding-bottom": (
+      responsive: true,
+      property: padding-bottom,
+      class: pb,
+      values: $spacers
+    ),
+    "padding-start": (
+      responsive: true,
+      property: padding-left,
+      class: ps,
+      values: $spacers
+    ),
+    // Gap utility
+    "gap": (
+      responsive: true,
+      property: gap,
+      class: gap,
+      values: $spacers
+    ),
+    "row-gap": (
+      responsive: true,
+      property: row-gap,
+      class: row-gap,
+      values: $spacers
+    ),
+    "column-gap": (
+      responsive: true,
+      property: column-gap,
+      class: column-gap,
+      values: $spacers
+    ),
+    // scss-docs-end utils-spacing
+    // Text
+    // scss-docs-start utils-text
+    "font-family": (
+      property: font-family,
+      class: font,
+      values: (monospace: var(--#{$prefix}font-monospace))
+    ),
+    "font-size": (
+      rfs: true,
+      property: font-size,
+      class: fs,
+      values: $font-sizes
+    ),
+    "font-style": (
+      property: font-style,
+      class: fst,
+      values: italic normal
+    ),
+    "font-weight": (
+      property: font-weight,
+      class: fw,
+      values: (
+        lighter: $font-weight-lighter,
+        light: $font-weight-light,
+        normal: $font-weight-normal,
+        medium: $font-weight-medium,
+        semibold: $font-weight-semibold,
+        bold: $font-weight-bold,
+        bolder: $font-weight-bolder
+      )
+    ),
+    "line-height": (
+      property: line-height,
+      class: lh,
+      values: (
+        1: 1,
+        sm: $line-height-sm,
+        base: $line-height-base,
+        lg: $line-height-lg,
+      )
+    ),
+    "text-align": (
+      responsive: true,
+      property: text-align,
+      class: text,
+      values: (
+        start: left,
+        end: right,
+        center: center,
+      )
+    ),
+    "text-decoration": (
+      property: text-decoration,
+      values: none underline line-through
+    ),
+    "text-transform": (
+      property: text-transform,
+      class: text,
+      values: lowercase uppercase capitalize
+    ),
+    "white-space": (
+      property: white-space,
+      class: text,
+      values: (
+        wrap: normal,
+        nowrap: nowrap,
+      )
+    ),
+    "word-wrap": (
+      property: word-wrap word-break,
+      class: text,
+      values: (break: break-word),
+      rtl: false
+    ),
+    // scss-docs-end utils-text
+    // scss-docs-start utils-color
+    "color": (
+      property: color,
+      class: text,
+      local-vars: (
+        "text-opacity": 1
+      ),
+      values: map-merge(
+        $utilities-text-colors,
+        (
+          "muted": var(--#{$prefix}secondary-color), // deprecated
+          "black-50": rgba($black, .5), // deprecated
+          "white-50": rgba($white, .5), // deprecated
+          "body-secondary": var(--#{$prefix}secondary-color),
+          "body-tertiary": var(--#{$prefix}tertiary-color),
+          "body-emphasis": var(--#{$prefix}emphasis-color),
+          "reset": inherit,
+        )
+      )
+    ),
+    "text-opacity": (
+      css-var: true,
+      class: text-opacity,
+      values: (
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1
+      )
+    ),
+    "text-color": (
+      property: color,
+      class: text,
+      values: $utilities-text-emphasis-colors
+    ),
+    // scss-docs-end utils-color
+    // scss-docs-start utils-links
+    "link-opacity": (
+      css-var: true,
+      class: link-opacity,
+      state: hover,
+      values: (
+        10: .1,
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1
+      )
+    ),
+    "link-offset": (
+      property: text-underline-offset,
+      class: link-offset,
+      state: hover,
+      values: (
+        1: .125em,
+        2: .25em,
+        3: .375em,
+      )
+    ),
+    "link-underline": (
+      property: text-decoration-color,
+      class: link-underline,
+      local-vars: (
+        "link-underline-opacity": 1
+      ),
+      values: map-merge(
+        $utilities-links-underline,
+        (
+          null: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-underline-opacity, 1)),
+        )
+      )
+    ),
+    "link-underline-opacity": (
+      css-var: true,
+      class: link-underline-opacity,
+      state: hover,
+      values: (
+        0: 0,
+        10: .1,
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1
+      ),
+    ),
+    // scss-docs-end utils-links
+    // scss-docs-start utils-bg-color
+    "background-color": (
+      property: background-color,
+      class: bg,
+      local-vars: (
+        "bg-opacity": 1
+      ),
+      values: map-merge(
+        $utilities-bg-colors,
+        (
+          "transparent": transparent,
+          "body-secondary": rgba(var(--#{$prefix}secondary-bg-rgb), var(--#{$prefix}bg-opacity)),
+          "body-tertiary": rgba(var(--#{$prefix}tertiary-bg-rgb), var(--#{$prefix}bg-opacity)),
+        )
+      )
+    ),
+    "bg-opacity": (
+      css-var: true,
+      class: bg-opacity,
+      values: (
+        10: .1,
+        25: .25,
+        50: .5,
+        75: .75,
+        100: 1
+      )
+    ),
+    "subtle-background-color": (
+      property: background-color,
+      class: bg,
+      values: $utilities-bg-subtle
+    ),
+    // scss-docs-end utils-bg-color
+    "gradient": (
+      property: background-image,
+      class: bg,
+      values: (gradient: var(--#{$prefix}gradient))
+    ),
+    // scss-docs-start utils-interaction
+    "user-select": (
+      property: user-select,
+      values: all auto none
+    ),
+    "pointer-events": (
+      property: pointer-events,
+      class: pe,
+      values: none auto,
+    ),
+    // scss-docs-end utils-interaction
+    // scss-docs-start utils-border-radius
+    "rounded": (
+      property: border-radius,
+      class: rounded,
+      values: (
+        null: var(--#{$prefix}border-radius),
+        0: 0,
+        1: var(--#{$prefix}border-radius-sm),
+        2: var(--#{$prefix}border-radius),
+        3: var(--#{$prefix}border-radius-lg),
+        4: var(--#{$prefix}border-radius-xl),
+        5: var(--#{$prefix}border-radius-xxl),
+        circle: 50%,
+        pill: var(--#{$prefix}border-radius-pill)
+      )
+    ),
+    "rounded-top": (
+      property: border-top-left-radius border-top-right-radius,
+      class: rounded-top,
+      values: (
+        null: var(--#{$prefix}border-radius),
+        0: 0,
+        1: var(--#{$prefix}border-radius-sm),
+        2: var(--#{$prefix}border-radius),
+        3: var(--#{$prefix}border-radius-lg),
+        4: var(--#{$prefix}border-radius-xl),
+        5: var(--#{$prefix}border-radius-xxl),
+        circle: 50%,
+        pill: var(--#{$prefix}border-radius-pill)
+      )
+    ),
+    "rounded-end": (
+      property: border-top-right-radius border-bottom-right-radius,
+      class: rounded-end,
+      values: (
+        null: var(--#{$prefix}border-radius),
+        0: 0,
+        1: var(--#{$prefix}border-radius-sm),
+        2: var(--#{$prefix}border-radius),
+        3: var(--#{$prefix}border-radius-lg),
+        4: var(--#{$prefix}border-radius-xl),
+        5: var(--#{$prefix}border-radius-xxl),
+        circle: 50%,
+        pill: var(--#{$prefix}border-radius-pill)
+      )
+    ),
+    "rounded-bottom": (
+      property: border-bottom-right-radius border-bottom-left-radius,
+      class: rounded-bottom,
+      values: (
+        null: var(--#{$prefix}border-radius),
+        0: 0,
+        1: var(--#{$prefix}border-radius-sm),
+        2: var(--#{$prefix}border-radius),
+        3: var(--#{$prefix}border-radius-lg),
+        4: var(--#{$prefix}border-radius-xl),
+        5: var(--#{$prefix}border-radius-xxl),
+        circle: 50%,
+        pill: var(--#{$prefix}border-radius-pill)
+      )
+    ),
+    "rounded-start": (
+      property: border-bottom-left-radius border-top-left-radius,
+      class: rounded-start,
+      values: (
+        null: var(--#{$prefix}border-radius),
+        0: 0,
+        1: var(--#{$prefix}border-radius-sm),
+        2: var(--#{$prefix}border-radius),
+        3: var(--#{$prefix}border-radius-lg),
+        4: var(--#{$prefix}border-radius-xl),
+        5: var(--#{$prefix}border-radius-xxl),
+        circle: 50%,
+        pill: var(--#{$prefix}border-radius-pill)
+      )
+    ),
+    // scss-docs-end utils-border-radius
+    // scss-docs-start utils-visibility
+    "visibility": (
+      property: visibility,
+      class: null,
+      values: (
+        visible: visible,
+        invisible: hidden,
+      )
+    ),
+    // scss-docs-end utils-visibility
+    // scss-docs-start utils-zindex
+    "z-index": (
+      property: z-index,
+      class: z,
+      values: $zindex-levels,
+    )
+    // scss-docs-end utils-zindex
+  ),
+  $utilities
+);
diff --git a/_sass/bootstrap/_variables-dark.scss b/_sass/bootstrap/_variables-dark.scss
new file mode 100644
index 0000000000..6422b38744
--- /dev/null
+++ b/_sass/bootstrap/_variables-dark.scss
@@ -0,0 +1,87 @@
+// Dark color mode variables
+//
+// Custom variables for the `[data-bs-theme="dark"]` theme. Use this as a starting point for your own custom color modes by creating a new theme-specific file like `_variables-dark.scss` and adding the variables you need.
+
+//
+// Global colors
+//
+
+// scss-docs-start sass-dark-mode-vars
+// scss-docs-start theme-text-dark-variables
+$primary-text-emphasis-dark:        tint-color($primary, 40%) !default;
+$secondary-text-emphasis-dark:      tint-color($secondary, 40%) !default;
+$success-text-emphasis-dark:        tint-color($success, 40%) !default;
+$info-text-emphasis-dark:           tint-color($info, 40%) !default;
+$warning-text-emphasis-dark:        tint-color($warning, 40%) !default;
+$danger-text-emphasis-dark:         tint-color($danger, 40%) !default;
+$light-text-emphasis-dark:          $gray-100 !default;
+$dark-text-emphasis-dark:           $gray-300 !default;
+// scss-docs-end theme-text-dark-variables
+
+// scss-docs-start theme-bg-subtle-dark-variables
+$primary-bg-subtle-dark:            shade-color($primary, 80%) !default;
+$secondary-bg-subtle-dark:          shade-color($secondary, 80%) !default;
+$success-bg-subtle-dark:            shade-color($success, 80%) !default;
+$info-bg-subtle-dark:               shade-color($info, 80%) !default;
+$warning-bg-subtle-dark:            shade-color($warning, 80%) !default;
+$danger-bg-subtle-dark:             shade-color($danger, 80%) !default;
+$light-bg-subtle-dark:              $gray-800 !default;
+$dark-bg-subtle-dark:               mix($gray-800, $black) !default;
+// scss-docs-end theme-bg-subtle-dark-variables
+
+// scss-docs-start theme-border-subtle-dark-variables
+$primary-border-subtle-dark:        shade-color($primary, 40%) !default;
+$secondary-border-subtle-dark:      shade-color($secondary, 40%) !default;
+$success-border-subtle-dark:        shade-color($success, 40%) !default;
+$info-border-subtle-dark:           shade-color($info, 40%) !default;
+$warning-border-subtle-dark:        shade-color($warning, 40%) !default;
+$danger-border-subtle-dark:         shade-color($danger, 40%) !default;
+$light-border-subtle-dark:          $gray-700 !default;
+$dark-border-subtle-dark:           $gray-800 !default;
+// scss-docs-end theme-border-subtle-dark-variables
+
+$body-color-dark:                   $gray-300 !default;
+$body-bg-dark:                      $gray-900 !default;
+$body-secondary-color-dark:         rgba($body-color-dark, .75) !default;
+$body-secondary-bg-dark:            $gray-800 !default;
+$body-tertiary-color-dark:          rgba($body-color-dark, .5) !default;
+$body-tertiary-bg-dark:             mix($gray-800, $gray-900, 50%) !default;
+$body-emphasis-color-dark:          $white !default;
+$border-color-dark:                 $gray-700 !default;
+$border-color-translucent-dark:     rgba($white, .15) !default;
+$headings-color-dark:               inherit !default;
+$link-color-dark:                   tint-color($primary, 40%) !default;
+$link-hover-color-dark:             shift-color($link-color-dark, -$link-shade-percentage) !default;
+$code-color-dark:                   tint-color($code-color, 40%) !default;
+$mark-color-dark:                   $body-color-dark !default;
+$mark-bg-dark:                      $yellow-800 !default;
+
+
+//
+// Forms
+//
+
+$form-select-indicator-color-dark:  $body-color-dark !default;
+$form-select-indicator-dark:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='#{$form-select-indicator-color-dark}' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/></svg>") !default;
+
+$form-switch-color-dark:            rgba($white, .25) !default;
+$form-switch-bg-image-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color-dark}'/></svg>") !default;
+
+// scss-docs-start form-validation-colors-dark
+$form-valid-color-dark:             $green-300 !default;
+$form-valid-border-color-dark:      $green-300 !default;
+$form-invalid-color-dark:           $red-300 !default;
+$form-invalid-border-color-dark:    $red-300 !default;
+// scss-docs-end form-validation-colors-dark
+
+
+//
+// Accordion
+//
+
+$accordion-icon-color-dark:         $primary-text-emphasis-dark !default;
+$accordion-icon-active-color-dark:  $primary-text-emphasis-dark !default;
+
+$accordion-button-icon-dark:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-color-dark}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>") !default;
+$accordion-button-active-icon-dark:  url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-active-color-dark}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>") !default;
+// scss-docs-end sass-dark-mode-vars
diff --git a/_sass/bootstrap/_variables.scss b/_sass/bootstrap/_variables.scss
index e0e64d3b29..5429c017e9 100644
--- a/_sass/bootstrap/_variables.scss
+++ b/_sass/bootstrap/_variables.scss
@@ -5,6 +5,7 @@
 
 // Color system
 
+// scss-docs-start gray-color-variables
 $white:    #fff !default;
 $gray-100: #f8f9fa !default;
 $gray-200: #e9ecef !default;
@@ -16,54 +17,287 @@ $gray-700: #495057 !default;
 $gray-800: #343a40 !default;
 $gray-900: #212529 !default;
 $black:    #000 !default;
+// scss-docs-end gray-color-variables
+
+// fusv-disable
+// scss-docs-start gray-colors-map
+$grays: (
+  "100": $gray-100,
+  "200": $gray-200,
+  "300": $gray-300,
+  "400": $gray-400,
+  "500": $gray-500,
+  "600": $gray-600,
+  "700": $gray-700,
+  "800": $gray-800,
+  "900": $gray-900
+) !default;
+// scss-docs-end gray-colors-map
+// fusv-enable
 
-$grays: () !default;
-$grays: map-merge(
-  (
-    "100": $gray-100,
-    "200": $gray-200,
-    "300": $gray-300,
-    "400": $gray-400,
-    "500": $gray-500,
-    "600": $gray-600,
-    "700": $gray-700,
-    "800": $gray-800,
-    "900": $gray-900
-  ),
-  $grays
-);
-
-$blue:    #007bff !default;
+// scss-docs-start color-variables
+$blue:    #0d6efd !default;
 $indigo:  #6610f2 !default;
 $purple:  #6f42c1 !default;
-$pink:    #e83e8c !default;
+$pink:    #d63384 !default;
 $red:     #dc3545 !default;
 $orange:  #fd7e14 !default;
 $yellow:  #ffc107 !default;
-$green:   #28a745 !default;
+$green:   #198754 !default;
 $teal:    #20c997 !default;
-$cyan:    #17a2b8 !default;
-
-$colors: () !default;
-$colors: map-merge(
-  (
-    "blue":       $blue,
-    "indigo":     $indigo,
-    "purple":     $purple,
-    "pink":       $pink,
-    "red":        $red,
-    "orange":     $orange,
-    "yellow":     $yellow,
-    "green":      $green,
-    "teal":       $teal,
-    "cyan":       $cyan,
-    "white":      $white,
-    "gray":       $gray-600,
-    "gray-dark":  $gray-800
-  ),
-  $colors
-);
+$cyan:    #0dcaf0 !default;
+// scss-docs-end color-variables
+
+// scss-docs-start colors-map
+$colors: (
+  "blue":       $blue,
+  "indigo":     $indigo,
+  "purple":     $purple,
+  "pink":       $pink,
+  "red":        $red,
+  "orange":     $orange,
+  "yellow":     $yellow,
+  "green":      $green,
+  "teal":       $teal,
+  "cyan":       $cyan,
+  "black":      $black,
+  "white":      $white,
+  "gray":       $gray-600,
+  "gray-dark":  $gray-800
+) !default;
+// scss-docs-end colors-map
+
+// The contrast ratio to reach against white, to determine if color changes from "light" to "dark". Acceptable values for WCAG 2.0 are 3, 4.5 and 7.
+// See https://www.w3.org/TR/WCAG20/#visual-audio-contrast-contrast
+$min-contrast-ratio:   4.5 !default;
+
+// Customize the light and dark text colors for use in our color contrast function.
+$color-contrast-dark:      $black !default;
+$color-contrast-light:     $white !default;
+
+// fusv-disable
+$blue-100: tint-color($blue, 80%) !default;
+$blue-200: tint-color($blue, 60%) !default;
+$blue-300: tint-color($blue, 40%) !default;
+$blue-400: tint-color($blue, 20%) !default;
+$blue-500: $blue !default;
+$blue-600: shade-color($blue, 20%) !default;
+$blue-700: shade-color($blue, 40%) !default;
+$blue-800: shade-color($blue, 60%) !default;
+$blue-900: shade-color($blue, 80%) !default;
+
+$indigo-100: tint-color($indigo, 80%) !default;
+$indigo-200: tint-color($indigo, 60%) !default;
+$indigo-300: tint-color($indigo, 40%) !default;
+$indigo-400: tint-color($indigo, 20%) !default;
+$indigo-500: $indigo !default;
+$indigo-600: shade-color($indigo, 20%) !default;
+$indigo-700: shade-color($indigo, 40%) !default;
+$indigo-800: shade-color($indigo, 60%) !default;
+$indigo-900: shade-color($indigo, 80%) !default;
+
+$purple-100: tint-color($purple, 80%) !default;
+$purple-200: tint-color($purple, 60%) !default;
+$purple-300: tint-color($purple, 40%) !default;
+$purple-400: tint-color($purple, 20%) !default;
+$purple-500: $purple !default;
+$purple-600: shade-color($purple, 20%) !default;
+$purple-700: shade-color($purple, 40%) !default;
+$purple-800: shade-color($purple, 60%) !default;
+$purple-900: shade-color($purple, 80%) !default;
+
+$pink-100: tint-color($pink, 80%) !default;
+$pink-200: tint-color($pink, 60%) !default;
+$pink-300: tint-color($pink, 40%) !default;
+$pink-400: tint-color($pink, 20%) !default;
+$pink-500: $pink !default;
+$pink-600: shade-color($pink, 20%) !default;
+$pink-700: shade-color($pink, 40%) !default;
+$pink-800: shade-color($pink, 60%) !default;
+$pink-900: shade-color($pink, 80%) !default;
+
+$red-100: tint-color($red, 80%) !default;
+$red-200: tint-color($red, 60%) !default;
+$red-300: tint-color($red, 40%) !default;
+$red-400: tint-color($red, 20%) !default;
+$red-500: $red !default;
+$red-600: shade-color($red, 20%) !default;
+$red-700: shade-color($red, 40%) !default;
+$red-800: shade-color($red, 60%) !default;
+$red-900: shade-color($red, 80%) !default;
+
+$orange-100: tint-color($orange, 80%) !default;
+$orange-200: tint-color($orange, 60%) !default;
+$orange-300: tint-color($orange, 40%) !default;
+$orange-400: tint-color($orange, 20%) !default;
+$orange-500: $orange !default;
+$orange-600: shade-color($orange, 20%) !default;
+$orange-700: shade-color($orange, 40%) !default;
+$orange-800: shade-color($orange, 60%) !default;
+$orange-900: shade-color($orange, 80%) !default;
+
+$yellow-100: tint-color($yellow, 80%) !default;
+$yellow-200: tint-color($yellow, 60%) !default;
+$yellow-300: tint-color($yellow, 40%) !default;
+$yellow-400: tint-color($yellow, 20%) !default;
+$yellow-500: $yellow !default;
+$yellow-600: shade-color($yellow, 20%) !default;
+$yellow-700: shade-color($yellow, 40%) !default;
+$yellow-800: shade-color($yellow, 60%) !default;
+$yellow-900: shade-color($yellow, 80%) !default;
+
+$green-100: tint-color($green, 80%) !default;
+$green-200: tint-color($green, 60%) !default;
+$green-300: tint-color($green, 40%) !default;
+$green-400: tint-color($green, 20%) !default;
+$green-500: $green !default;
+$green-600: shade-color($green, 20%) !default;
+$green-700: shade-color($green, 40%) !default;
+$green-800: shade-color($green, 60%) !default;
+$green-900: shade-color($green, 80%) !default;
+
+$teal-100: tint-color($teal, 80%) !default;
+$teal-200: tint-color($teal, 60%) !default;
+$teal-300: tint-color($teal, 40%) !default;
+$teal-400: tint-color($teal, 20%) !default;
+$teal-500: $teal !default;
+$teal-600: shade-color($teal, 20%) !default;
+$teal-700: shade-color($teal, 40%) !default;
+$teal-800: shade-color($teal, 60%) !default;
+$teal-900: shade-color($teal, 80%) !default;
+
+$cyan-100: tint-color($cyan, 80%) !default;
+$cyan-200: tint-color($cyan, 60%) !default;
+$cyan-300: tint-color($cyan, 40%) !default;
+$cyan-400: tint-color($cyan, 20%) !default;
+$cyan-500: $cyan !default;
+$cyan-600: shade-color($cyan, 20%) !default;
+$cyan-700: shade-color($cyan, 40%) !default;
+$cyan-800: shade-color($cyan, 60%) !default;
+$cyan-900: shade-color($cyan, 80%) !default;
+
+$blues: (
+  "blue-100": $blue-100,
+  "blue-200": $blue-200,
+  "blue-300": $blue-300,
+  "blue-400": $blue-400,
+  "blue-500": $blue-500,
+  "blue-600": $blue-600,
+  "blue-700": $blue-700,
+  "blue-800": $blue-800,
+  "blue-900": $blue-900
+) !default;
+
+$indigos: (
+  "indigo-100": $indigo-100,
+  "indigo-200": $indigo-200,
+  "indigo-300": $indigo-300,
+  "indigo-400": $indigo-400,
+  "indigo-500": $indigo-500,
+  "indigo-600": $indigo-600,
+  "indigo-700": $indigo-700,
+  "indigo-800": $indigo-800,
+  "indigo-900": $indigo-900
+) !default;
+
+$purples: (
+  "purple-100": $purple-100,
+  "purple-200": $purple-200,
+  "purple-300": $purple-300,
+  "purple-400": $purple-400,
+  "purple-500": $purple-500,
+  "purple-600": $purple-600,
+  "purple-700": $purple-700,
+  "purple-800": $purple-800,
+  "purple-900": $purple-900
+) !default;
+
+$pinks: (
+  "pink-100": $pink-100,
+  "pink-200": $pink-200,
+  "pink-300": $pink-300,
+  "pink-400": $pink-400,
+  "pink-500": $pink-500,
+  "pink-600": $pink-600,
+  "pink-700": $pink-700,
+  "pink-800": $pink-800,
+  "pink-900": $pink-900
+) !default;
+
+$reds: (
+  "red-100": $red-100,
+  "red-200": $red-200,
+  "red-300": $red-300,
+  "red-400": $red-400,
+  "red-500": $red-500,
+  "red-600": $red-600,
+  "red-700": $red-700,
+  "red-800": $red-800,
+  "red-900": $red-900
+) !default;
+
+$oranges: (
+  "orange-100": $orange-100,
+  "orange-200": $orange-200,
+  "orange-300": $orange-300,
+  "orange-400": $orange-400,
+  "orange-500": $orange-500,
+  "orange-600": $orange-600,
+  "orange-700": $orange-700,
+  "orange-800": $orange-800,
+  "orange-900": $orange-900
+) !default;
+
+$yellows: (
+  "yellow-100": $yellow-100,
+  "yellow-200": $yellow-200,
+  "yellow-300": $yellow-300,
+  "yellow-400": $yellow-400,
+  "yellow-500": $yellow-500,
+  "yellow-600": $yellow-600,
+  "yellow-700": $yellow-700,
+  "yellow-800": $yellow-800,
+  "yellow-900": $yellow-900
+) !default;
 
+$greens: (
+  "green-100": $green-100,
+  "green-200": $green-200,
+  "green-300": $green-300,
+  "green-400": $green-400,
+  "green-500": $green-500,
+  "green-600": $green-600,
+  "green-700": $green-700,
+  "green-800": $green-800,
+  "green-900": $green-900
+) !default;
+
+$teals: (
+  "teal-100": $teal-100,
+  "teal-200": $teal-200,
+  "teal-300": $teal-300,
+  "teal-400": $teal-400,
+  "teal-500": $teal-500,
+  "teal-600": $teal-600,
+  "teal-700": $teal-700,
+  "teal-800": $teal-800,
+  "teal-900": $teal-900
+) !default;
+
+$cyans: (
+  "cyan-100": $cyan-100,
+  "cyan-200": $cyan-200,
+  "cyan-300": $cyan-300,
+  "cyan-400": $cyan-400,
+  "cyan-500": $cyan-500,
+  "cyan-600": $cyan-600,
+  "cyan-700": $cyan-700,
+  "cyan-800": $cyan-800,
+  "cyan-900": $cyan-900
+) !default;
+// fusv-enable
+
+// scss-docs-start theme-color-variables
 $primary:       $blue !default;
 $secondary:     $gray-600 !default;
 $success:       $green !default;
@@ -71,32 +305,54 @@ $info:          $cyan !default;
 $warning:       $yellow !default;
 $danger:        $red !default;
 $light:         $gray-100 !default;
-$dark:          $gray-800 !default;
-
-$theme-colors: () !default;
-$theme-colors: map-merge(
-  (
-    "primary":    $primary,
-    "secondary":  $secondary,
-    "success":    $success,
-    "info":       $info,
-    "warning":    $warning,
-    "danger":     $danger,
-    "light":      $light,
-    "dark":       $dark
-  ),
-  $theme-colors
-);
-
-// Set a specific jump point for requesting color jumps
-$theme-color-interval:      8% !default;
-
-// The yiq lightness value that determines when the lightness of color changes from "dark" to "light". Acceptable values are between 0 and 255.
-$yiq-contrasted-threshold:  150 !default;
-
-// Customize the light and dark text colors for use in our YIQ color contrast function.
-$yiq-text-dark:             $gray-900 !default;
-$yiq-text-light:            $white !default;
+$dark:          $gray-900 !default;
+// scss-docs-end theme-color-variables
+
+// scss-docs-start theme-colors-map
+$theme-colors: (
+  "primary":    $primary,
+  "secondary":  $secondary,
+  "success":    $success,
+  "info":       $info,
+  "warning":    $warning,
+  "danger":     $danger,
+  "light":      $light,
+  "dark":       $dark
+) !default;
+// scss-docs-end theme-colors-map
+
+// scss-docs-start theme-text-variables
+$primary-text-emphasis:   shade-color($primary, 60%) !default;
+$secondary-text-emphasis: shade-color($secondary, 60%) !default;
+$success-text-emphasis:   shade-color($success, 60%) !default;
+$info-text-emphasis:      shade-color($info, 60%) !default;
+$warning-text-emphasis:   shade-color($warning, 60%) !default;
+$danger-text-emphasis:    shade-color($danger, 60%) !default;
+$light-text-emphasis:     $gray-700 !default;
+$dark-text-emphasis:      $gray-700 !default;
+// scss-docs-end theme-text-variables
+
+// scss-docs-start theme-bg-subtle-variables
+$primary-bg-subtle:       tint-color($primary, 80%) !default;
+$secondary-bg-subtle:     tint-color($secondary, 80%) !default;
+$success-bg-subtle:       tint-color($success, 80%) !default;
+$info-bg-subtle:          tint-color($info, 80%) !default;
+$warning-bg-subtle:       tint-color($warning, 80%) !default;
+$danger-bg-subtle:        tint-color($danger, 80%) !default;
+$light-bg-subtle:         mix($gray-100, $white) !default;
+$dark-bg-subtle:          $gray-400 !default;
+// scss-docs-end theme-bg-subtle-variables
+
+// scss-docs-start theme-border-subtle-variables
+$primary-border-subtle:   tint-color($primary, 60%) !default;
+$secondary-border-subtle: tint-color($secondary, 60%) !default;
+$success-border-subtle:   tint-color($success, 60%) !default;
+$info-border-subtle:      tint-color($info, 60%) !default;
+$warning-border-subtle:   tint-color($warning, 60%) !default;
+$danger-border-subtle:    tint-color($danger, 60%) !default;
+$light-border-subtle:     $gray-200 !default;
+$dark-border-subtle:      $gray-500 !default;
+// scss-docs-end theme-border-subtle-variables
 
 // Characters which are escaped by the escape-svg function
 $escaped-characters: (
@@ -107,25 +363,42 @@ $escaped-characters: (
   (")", "%29"),
 ) !default;
 
-
 // Options
 //
 // Quickly modify global styling by enabling or disabling optional features.
 
-$enable-caret:                                true !default;
-$enable-rounded:                              true !default;
-$enable-shadows:                              false !default;
-$enable-gradients:                            false !default;
-$enable-transitions:                          true !default;
-$enable-prefers-reduced-motion-media-query:   true !default;
-$enable-hover-media-query:                    false !default; // Deprecated, no longer affects any compiled CSS
-$enable-grid-classes:                         true !default;
-$enable-pointer-cursor-for-buttons:           true !default;
-$enable-print-styles:                         true !default;
-$enable-responsive-font-sizes:                false !default;
-$enable-validation-icons:                     true !default;
-$enable-deprecation-messages:                 true !default;
-
+$enable-caret:                true !default;
+$enable-rounded:              true !default;
+$enable-shadows:              false !default;
+$enable-gradients:            false !default;
+$enable-transitions:          true !default;
+$enable-reduced-motion:       true !default;
+$enable-smooth-scroll:        true !default;
+$enable-grid-classes:         true !default;
+$enable-container-classes:    true !default;
+$enable-cssgrid:              false !default;
+$enable-button-pointers:      true !default;
+$enable-rfs:                  true !default;
+$enable-validation-icons:     true !default;
+$enable-negative-margins:     false !default;
+$enable-deprecation-messages: true !default;
+$enable-important-utilities:  true !default;
+
+$enable-dark-mode:            true !default;
+$color-mode-type:             data !default; // `data` or `media-query`
+
+// Prefix for :root CSS variables
+
+$variable-prefix:             bs- !default; // Deprecated in v5.2.0 for the shorter `$prefix`
+$prefix:                      $variable-prefix !default;
+
+// Gradient
+//
+// The gradient which is added to components if `$enable-gradients` is `true`
+// This gradient is also added to elements with `.bg-gradient`
+// scss-docs-start variable-gradient
+$gradient: linear-gradient(180deg, rgba($white, .15), rgba($white, 0)) !default;
+// scss-docs-end variable-gradient
 
 // Spacing
 //
@@ -133,52 +406,67 @@ $enable-deprecation-messages:                 true !default;
 // variables. Mostly focused on spacing.
 // You can add more entries to the $spacers map, should you need more variation.
 
+// scss-docs-start spacer-variables-maps
 $spacer: 1rem !default;
-$spacers: () !default;
-$spacers: map-merge(
-  (
-    0: 0,
-    1: ($spacer * .25),
-    2: ($spacer * .5),
-    3: $spacer,
-    4: ($spacer * 1.5),
-    5: ($spacer * 3)
-  ),
-  $spacers
-);
-
-// This variable affects the `.h-*` and `.w-*` classes.
-$sizes: () !default;
-$sizes: map-merge(
-  (
-    25: 25%,
-    50: 50%,
-    75: 75%,
-    100: 100%,
-    auto: auto
-  ),
-  $sizes
-);
+$spacers: (
+  0: 0,
+  1: $spacer * .25,
+  2: $spacer * .5,
+  3: $spacer,
+  4: $spacer * 1.5,
+  5: $spacer * 3,
+) !default;
+// scss-docs-end spacer-variables-maps
 
+// Position
+//
+// Define the edge positioning anchors of the position utilities.
+
+// scss-docs-start position-map
+$position-values: (
+  0: 0,
+  50: 50%,
+  100: 100%
+) !default;
+// scss-docs-end position-map
 
 // Body
 //
 // Settings for the `<body>` element.
 
-$body-bg:                   $white !default;
+$body-text-align:           null !default;
 $body-color:                $gray-900 !default;
+$body-bg:                   $white !default;
 
+$body-secondary-color:      rgba($body-color, .75) !default;
+$body-secondary-bg:         $gray-200 !default;
+
+$body-tertiary-color:       rgba($body-color, .5) !default;
+$body-tertiary-bg:          $gray-100 !default;
+
+$body-emphasis-color:       $black !default;
 
 // Links
 //
 // Style anchor elements.
 
-$link-color:                              theme-color("primary") !default;
-$link-decoration:                         none !default;
-$link-hover-color:                        darken($link-color, 15%) !default;
-$link-hover-decoration:                   underline !default;
-// Darken percentage for links with `.text-*` class (e.g. `.text-success`)
-$emphasized-link-hover-darken-percentage: 15% !default;
+$link-color:                              $primary !default;
+$link-decoration:                         underline !default;
+$link-shade-percentage:                   20% !default;
+$link-hover-color:                        shift-color($link-color, $link-shade-percentage) !default;
+$link-hover-decoration:                   null !default;
+
+$stretched-link-pseudo-element:           after !default;
+$stretched-link-z-index:                  1 !default;
+
+// Icon links
+// scss-docs-start icon-link-variables
+$icon-link-gap:               .375rem !default;
+$icon-link-underline-offset:  .25em !default;
+$icon-link-icon-size:         1em !default;
+$icon-link-icon-transition:   .2s ease-in-out transform !default;
+$icon-link-icon-transform:    translate3d(.25em, 0, 0) !default;
+// scss-docs-end icon-link-variables
 
 // Paragraphs
 //
@@ -192,13 +480,16 @@ $paragraph-margin-bottom:   1rem !default;
 // Define the minimum dimensions at which your layout will change,
 // adapting to different screen sizes, for use in media queries.
 
+// scss-docs-start grid-breakpoints
 $grid-breakpoints: (
   xs: 0,
   sm: 576px,
   md: 768px,
   lg: 992px,
-  xl: 1200px
+  xl: 1200px,
+  xxl: 1400px
 ) !default;
+// scss-docs-end grid-breakpoints
 
 @include _assert-ascending($grid-breakpoints, "$grid-breakpoints");
 @include _assert-starts-at-zero($grid-breakpoints, "$grid-breakpoints");
@@ -208,12 +499,15 @@ $grid-breakpoints: (
 //
 // Define the maximum width of `.container` for different screen sizes.
 
+// scss-docs-start container-max-widths
 $container-max-widths: (
   sm: 540px,
   md: 720px,
   lg: 960px,
-  xl: 1140px
+  xl: 1140px,
+  xxl: 1320px
 ) !default;
+// scss-docs-end container-max-widths
 
 @include _assert-ascending($container-max-widths, "$container-max-widths");
 
@@ -223,74 +517,118 @@ $container-max-widths: (
 // Set the number of columns and specify the width of the gutters.
 
 $grid-columns:                12 !default;
-$grid-gutter-width:           30px !default;
+$grid-gutter-width:           1.5rem !default;
 $grid-row-columns:            6 !default;
 
+// Container padding
+
+$container-padding-x: $grid-gutter-width !default;
+
 
 // Components
 //
 // Define common padding and border radius sizes and more.
 
-$line-height-lg:              1.5 !default;
-$line-height-sm:              1.5 !default;
-
+// scss-docs-start border-variables
 $border-width:                1px !default;
+$border-widths: (
+  1: 1px,
+  2: 2px,
+  3: 3px,
+  4: 4px,
+  5: 5px
+) !default;
+$border-style:                solid !default;
 $border-color:                $gray-300 !default;
-
-$border-radius:               .25rem !default;
-$border-radius-lg:            .3rem !default;
-$border-radius-sm:            .2rem !default;
-
-$rounded-pill:                50rem !default;
-
-$box-shadow-sm:               0 .125rem .25rem rgba($black, .075) !default;
+$border-color-translucent:    rgba($black, .175) !default;
+// scss-docs-end border-variables
+
+// scss-docs-start border-radius-variables
+$border-radius:               .375rem !default;
+$border-radius-sm:            .25rem !default;
+$border-radius-lg:            .5rem !default;
+$border-radius-xl:            1rem !default;
+$border-radius-xxl:           2rem !default;
+$border-radius-pill:          50rem !default;
+// scss-docs-end border-radius-variables
+// fusv-disable
+$border-radius-2xl:           $border-radius-xxl !default; // Deprecated in v5.3.0
+// fusv-enable
+
+// scss-docs-start box-shadow-variables
 $box-shadow:                  0 .5rem 1rem rgba($black, .15) !default;
+$box-shadow-sm:               0 .125rem .25rem rgba($black, .075) !default;
 $box-shadow-lg:               0 1rem 3rem rgba($black, .175) !default;
+$box-shadow-inset:            inset 0 1px 2px rgba($black, .075) !default;
+// scss-docs-end box-shadow-variables
 
 $component-active-color:      $white !default;
-$component-active-bg:         theme-color("primary") !default;
+$component-active-bg:         $primary !default;
 
+// scss-docs-start focus-ring-variables
+$focus-ring-width:      .25rem !default;
+$focus-ring-opacity:    .25 !default;
+$focus-ring-color:      rgba($primary, $focus-ring-opacity) !default;
+$focus-ring-blur:       0 !default;
+$focus-ring-box-shadow: 0 0 $focus-ring-blur $focus-ring-width $focus-ring-color !default;
+// scss-docs-end focus-ring-variables
+
+// scss-docs-start caret-variables
 $caret-width:                 .3em !default;
 $caret-vertical-align:        $caret-width * .85 !default;
 $caret-spacing:               $caret-width * .85 !default;
+// scss-docs-end caret-variables
 
 $transition-base:             all .2s ease-in-out !default;
 $transition-fade:             opacity .15s linear !default;
+// scss-docs-start collapse-transition
 $transition-collapse:         height .35s ease !default;
-
-$embed-responsive-aspect-ratios: () !default;
-$embed-responsive-aspect-ratios: join(
-  (
-    (21 9),
-    (16 9),
-    (4 3),
-    (1 1),
-  ),
-  $embed-responsive-aspect-ratios
-);
+$transition-collapse-width:   width .35s ease !default;
+// scss-docs-end collapse-transition
+
+// stylelint-disable function-disallowed-list
+// scss-docs-start aspect-ratios
+$aspect-ratios: (
+  "1x1": 100%,
+  "4x3": calc(3 / 4 * 100%),
+  "16x9": calc(9 / 16 * 100%),
+  "21x9": calc(9 / 21 * 100%)
+) !default;
+// scss-docs-end aspect-ratios
+// stylelint-enable function-disallowed-list
 
 // Typography
 //
 // Font, line-height, and color for body text, headings, and more.
 
+// scss-docs-start font-variables
 // stylelint-disable value-keyword-case
-$font-family-sans-serif:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;
+$font-family-sans-serif:      system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;
 $font-family-monospace:       SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace !default;
-$font-family-base:            $font-family-sans-serif !default;
 // stylelint-enable value-keyword-case
+$font-family-base:            var(--#{$prefix}font-sans-serif) !default;
+$font-family-code:            var(--#{$prefix}font-monospace) !default;
 
+// $font-size-root affects the value of `rem`, which is used for as well font sizes, paddings, and margins
+// $font-size-base affects the font size of the body text
+$font-size-root:              null !default;
 $font-size-base:              1rem !default; // Assumes the browser default, typically `16px`
-$font-size-lg:                $font-size-base * 1.25 !default;
 $font-size-sm:                $font-size-base * .875 !default;
+$font-size-lg:                $font-size-base * 1.25 !default;
 
 $font-weight-lighter:         lighter !default;
 $font-weight-light:           300 !default;
 $font-weight-normal:          400 !default;
+$font-weight-medium:          500 !default;
+$font-weight-semibold:        600 !default;
 $font-weight-bold:            700 !default;
 $font-weight-bolder:          bolder !default;
 
 $font-weight-base:            $font-weight-normal !default;
+
 $line-height-base:            1.5 !default;
+$line-height-sm:              1.25 !default;
+$line-height-lg:              2 !default;
 
 $h1-font-size:                $font-size-base * 2.5 !default;
 $h2-font-size:                $font-size-base * 2 !default;
@@ -298,119 +636,186 @@ $h3-font-size:                $font-size-base * 1.75 !default;
 $h4-font-size:                $font-size-base * 1.5 !default;
 $h5-font-size:                $font-size-base * 1.25 !default;
 $h6-font-size:                $font-size-base !default;
+// scss-docs-end font-variables
+
+// scss-docs-start font-sizes
+$font-sizes: (
+  1: $h1-font-size,
+  2: $h2-font-size,
+  3: $h3-font-size,
+  4: $h4-font-size,
+  5: $h5-font-size,
+  6: $h6-font-size
+) !default;
+// scss-docs-end font-sizes
 
-$headings-margin-bottom:      $spacer * 0.5 !default;
+// scss-docs-start headings-variables
+$headings-margin-bottom:      $spacer * .5 !default;
 $headings-font-family:        null !default;
+$headings-font-style:         null !default;
 $headings-font-weight:        500 !default;
 $headings-line-height:        1.2 !default;
-$headings-color:              null !default;
-
-$display1-size:               6rem !default;
-$display2-size:               5.5rem !default;
-$display3-size:               4.5rem !default;
-$display4-size:               3.5rem !default;
+$headings-color:              inherit !default;
+// scss-docs-end headings-variables
+
+// scss-docs-start display-headings
+$display-font-sizes: (
+  1: 5rem,
+  2: 4.5rem,
+  3: 4rem,
+  4: 3.5rem,
+  5: 3rem,
+  6: 2.5rem
+) !default;
 
-$display1-weight:             300 !default;
-$display2-weight:             300 !default;
-$display3-weight:             300 !default;
-$display4-weight:             300 !default;
-$display-line-height:         $headings-line-height !default;
+$display-font-family: null !default;
+$display-font-style:  null !default;
+$display-font-weight: 300 !default;
+$display-line-height: $headings-line-height !default;
+// scss-docs-end display-headings
 
+// scss-docs-start type-variables
 $lead-font-size:              $font-size-base * 1.25 !default;
 $lead-font-weight:            300 !default;
 
-$small-font-size:             80% !default;
+$small-font-size:             .875em !default;
+
+$sub-sup-font-size:           .75em !default;
 
-$text-muted:                  $gray-600 !default;
+// fusv-disable
+$text-muted:                  var(--#{$prefix}secondary-color) !default; // Deprecated in 5.3.0
+// fusv-enable
 
-$blockquote-small-color:      $gray-600 !default;
-$blockquote-small-font-size:  $small-font-size !default;
+$initialism-font-size:        $small-font-size !default;
+
+$blockquote-margin-y:         $spacer !default;
 $blockquote-font-size:        $font-size-base * 1.25 !default;
+$blockquote-footer-color:     $gray-600 !default;
+$blockquote-footer-font-size: $small-font-size !default;
 
-$hr-border-color:             rgba($black, .1) !default;
-$hr-border-width:             $border-width !default;
+$hr-margin-y:                 $spacer !default;
+$hr-color:                    inherit !default;
 
-$mark-padding:                .2em !default;
+// fusv-disable
+$hr-bg-color:                 null !default; // Deprecated in v5.2.0
+$hr-height:                   null !default; // Deprecated in v5.2.0
+// fusv-enable
 
-$dt-font-weight:              $font-weight-bold !default;
+$hr-border-color:             null !default; // Allows for inherited colors
+$hr-border-width:             var(--#{$prefix}border-width) !default;
+$hr-opacity:                  .25 !default;
 
-$kbd-box-shadow:              inset 0 -.1rem 0 rgba($black, .25) !default;
-$nested-kbd-font-weight:      $font-weight-bold !default;
+// scss-docs-start vr-variables
+$vr-border-width:             var(--#{$prefix}border-width) !default;
+// scss-docs-end vr-variables
 
-$list-inline-padding:         .5rem !default;
+$legend-margin-bottom:        .5rem !default;
+$legend-font-size:            1.5rem !default;
+$legend-font-weight:          null !default;
 
-$mark-bg:                     #fcf8e3 !default;
+$dt-font-weight:              $font-weight-bold !default;
 
-$hr-margin-y:                 $spacer !default;
+$list-inline-padding:         .5rem !default;
+
+$mark-padding:                .1875em !default;
+$mark-color:                  $body-color !default;
+$mark-bg:                     $yellow-100 !default;
+// scss-docs-end type-variables
 
 
 // Tables
 //
 // Customizes the `.table` component with basic values, each used across all table variations.
 
-$table-cell-padding:          .75rem !default;
-$table-cell-padding-sm:       .3rem !default;
+// scss-docs-start table-variables
+$table-cell-padding-y:        .5rem !default;
+$table-cell-padding-x:        .5rem !default;
+$table-cell-padding-y-sm:     .25rem !default;
+$table-cell-padding-x-sm:     .25rem !default;
 
-$table-color:                 $body-color !default;
-$table-bg:                    null !default;
-$table-accent-bg:             rgba($black, .05) !default;
-$table-hover-color:           $table-color !default;
-$table-hover-bg:              rgba($black, .075) !default;
-$table-active-bg:             $table-hover-bg !default;
+$table-cell-vertical-align:   top !default;
 
-$table-border-width:          $border-width !default;
-$table-border-color:          $border-color !default;
+$table-color:                 var(--#{$prefix}emphasis-color) !default;
+$table-bg:                    var(--#{$prefix}body-bg) !default;
+$table-accent-bg:             transparent !default;
 
-$table-head-bg:               $gray-200 !default;
-$table-head-color:            $gray-700 !default;
 $table-th-font-weight:        null !default;
 
-$table-dark-color:            $white !default;
-$table-dark-bg:               $gray-800 !default;
-$table-dark-accent-bg:        rgba($white, .05) !default;
-$table-dark-hover-color:      $table-dark-color !default;
-$table-dark-hover-bg:         rgba($white, .075) !default;
-$table-dark-border-color:     lighten($table-dark-bg, 7.5%) !default;
+$table-striped-color:         $table-color !default;
+$table-striped-bg-factor:     .05 !default;
+$table-striped-bg:            rgba(var(--#{$prefix}emphasis-color-rgb), $table-striped-bg-factor) !default;
+
+$table-active-color:          $table-color !default;
+$table-active-bg-factor:      .1 !default;
+$table-active-bg:             rgba(var(--#{$prefix}emphasis-color-rgb), $table-active-bg-factor) !default;
+
+$table-hover-color:           $table-color !default;
+$table-hover-bg-factor:       .075 !default;
+$table-hover-bg:              rgba(var(--#{$prefix}emphasis-color-rgb), $table-hover-bg-factor) !default;
+
+$table-border-factor:         .2 !default;
+$table-border-width:          var(--#{$prefix}border-width) !default;
+$table-border-color:          var(--#{$prefix}border-color) !default;
 
 $table-striped-order:         odd !default;
+$table-striped-columns-order: even !default;
+
+$table-group-separator-color: currentcolor !default;
+
+$table-caption-color:         var(--#{$prefix}secondary-color) !default;
 
-$table-caption-color:         $text-muted !default;
+$table-bg-scale:              -80% !default;
+// scss-docs-end table-variables
 
-$table-bg-level:              -9 !default;
-$table-border-level:          -6 !default;
+// scss-docs-start table-loop
+$table-variants: (
+  "primary":    shift-color($primary, $table-bg-scale),
+  "secondary":  shift-color($secondary, $table-bg-scale),
+  "success":    shift-color($success, $table-bg-scale),
+  "info":       shift-color($info, $table-bg-scale),
+  "warning":    shift-color($warning, $table-bg-scale),
+  "danger":     shift-color($danger, $table-bg-scale),
+  "light":      $light,
+  "dark":       $dark,
+) !default;
+// scss-docs-end table-loop
 
 
 // Buttons + Forms
 //
 // Shared variables that are reassigned to `$input-` and `$btn-` specific variables.
 
+// scss-docs-start input-btn-variables
 $input-btn-padding-y:         .375rem !default;
 $input-btn-padding-x:         .75rem !default;
 $input-btn-font-family:       null !default;
 $input-btn-font-size:         $font-size-base !default;
 $input-btn-line-height:       $line-height-base !default;
 
-$input-btn-focus-width:       .2rem !default;
-$input-btn-focus-color:       rgba($component-active-bg, .25) !default;
-$input-btn-focus-box-shadow:  0 0 0 $input-btn-focus-width $input-btn-focus-color !default;
+$input-btn-focus-width:         $focus-ring-width !default;
+$input-btn-focus-color-opacity: $focus-ring-opacity !default;
+$input-btn-focus-color:         $focus-ring-color !default;
+$input-btn-focus-blur:          $focus-ring-blur !default;
+$input-btn-focus-box-shadow:    $focus-ring-box-shadow !default;
 
 $input-btn-padding-y-sm:      .25rem !default;
 $input-btn-padding-x-sm:      .5rem !default;
 $input-btn-font-size-sm:      $font-size-sm !default;
-$input-btn-line-height-sm:    $line-height-sm !default;
 
 $input-btn-padding-y-lg:      .5rem !default;
 $input-btn-padding-x-lg:      1rem !default;
 $input-btn-font-size-lg:      $font-size-lg !default;
-$input-btn-line-height-lg:    $line-height-lg !default;
 
-$input-btn-border-width:      $border-width !default;
+$input-btn-border-width:      var(--#{$prefix}border-width) !default;
+// scss-docs-end input-btn-variables
 
 
 // Buttons
 //
 // For each of Bootstrap's buttons, define text, background, and border color.
 
+// scss-docs-start btn-variables
+$btn-color:                   var(--#{$prefix}body-color) !default;
 $btn-padding-y:               $input-btn-padding-y !default;
 $btn-padding-x:               $input-btn-padding-x !default;
 $btn-font-family:             $input-btn-font-family !default;
@@ -421,12 +826,10 @@ $btn-white-space:             null !default; // Set to `nowrap` to prevent text
 $btn-padding-y-sm:            $input-btn-padding-y-sm !default;
 $btn-padding-x-sm:            $input-btn-padding-x-sm !default;
 $btn-font-size-sm:            $input-btn-font-size-sm !default;
-$btn-line-height-sm:          $input-btn-line-height-sm !default;
 
 $btn-padding-y-lg:            $input-btn-padding-y-lg !default;
 $btn-padding-x-lg:            $input-btn-padding-x-lg !default;
 $btn-font-size-lg:            $input-btn-font-size-lg !default;
-$btn-line-height-lg:          $input-btn-line-height-lg !default;
 
 $btn-border-width:            $input-btn-border-width !default;
 
@@ -437,22 +840,48 @@ $btn-focus-box-shadow:        $input-btn-focus-box-shadow !default;
 $btn-disabled-opacity:        .65 !default;
 $btn-active-box-shadow:       inset 0 3px 5px rgba($black, .125) !default;
 
+$btn-link-color:              var(--#{$prefix}link-color) !default;
+$btn-link-hover-color:        var(--#{$prefix}link-hover-color) !default;
 $btn-link-disabled-color:     $gray-600 !default;
-
-$btn-block-spacing-y:         .5rem !default;
+$btn-link-focus-shadow-rgb:   to-rgb(mix(color-contrast($link-color), $link-color, 15%)) !default;
 
 // Allows for customizing button radius independently from global border radius
-$btn-border-radius:           $border-radius !default;
-$btn-border-radius-lg:        $border-radius-lg !default;
-$btn-border-radius-sm:        $border-radius-sm !default;
+$btn-border-radius:           var(--#{$prefix}border-radius) !default;
+$btn-border-radius-sm:        var(--#{$prefix}border-radius-sm) !default;
+$btn-border-radius-lg:        var(--#{$prefix}border-radius-lg) !default;
 
 $btn-transition:              color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
 
+$btn-hover-bg-shade-amount:       15% !default;
+$btn-hover-bg-tint-amount:        15% !default;
+$btn-hover-border-shade-amount:   20% !default;
+$btn-hover-border-tint-amount:    10% !default;
+$btn-active-bg-shade-amount:      20% !default;
+$btn-active-bg-tint-amount:       20% !default;
+$btn-active-border-shade-amount:  25% !default;
+$btn-active-border-tint-amount:   10% !default;
+// scss-docs-end btn-variables
 
-// Forms
 
-$label-margin-bottom:                   .5rem !default;
+// Forms
 
+// scss-docs-start form-text-variables
+$form-text-margin-top:                  .25rem !default;
+$form-text-font-size:                   $small-font-size !default;
+$form-text-font-style:                  null !default;
+$form-text-font-weight:                 null !default;
+$form-text-color:                       var(--#{$prefix}secondary-color) !default;
+// scss-docs-end form-text-variables
+
+// scss-docs-start form-label-variables
+$form-label-margin-bottom:              .5rem !default;
+$form-label-font-size:                  null !default;
+$form-label-font-style:                 null !default;
+$form-label-font-weight:                null !default;
+$form-label-color:                      null !default;
+// scss-docs-end form-label-variables
+
+// scss-docs-start form-input-variables
 $input-padding-y:                       $input-btn-padding-y !default;
 $input-padding-x:                       $input-btn-padding-x !default;
 $input-font-family:                     $input-btn-font-family !default;
@@ -463,260 +892,303 @@ $input-line-height:                     $input-btn-line-height !default;
 $input-padding-y-sm:                    $input-btn-padding-y-sm !default;
 $input-padding-x-sm:                    $input-btn-padding-x-sm !default;
 $input-font-size-sm:                    $input-btn-font-size-sm !default;
-$input-line-height-sm:                  $input-btn-line-height-sm !default;
 
 $input-padding-y-lg:                    $input-btn-padding-y-lg !default;
 $input-padding-x-lg:                    $input-btn-padding-x-lg !default;
 $input-font-size-lg:                    $input-btn-font-size-lg !default;
-$input-line-height-lg:                  $input-btn-line-height-lg !default;
 
-$input-bg:                              $white !default;
-$input-disabled-bg:                     $gray-200 !default;
+$input-bg:                              var(--#{$prefix}body-bg) !default;
+$input-disabled-color:                  null !default;
+$input-disabled-bg:                     var(--#{$prefix}secondary-bg) !default;
+$input-disabled-border-color:           null !default;
 
-$input-color:                           $gray-700 !default;
-$input-border-color:                    $gray-400 !default;
+$input-color:                           var(--#{$prefix}body-color) !default;
+$input-border-color:                    var(--#{$prefix}border-color) !default;
 $input-border-width:                    $input-btn-border-width !default;
-$input-box-shadow:                      inset 0 1px 1px rgba($black, .075) !default;
+$input-box-shadow:                      var(--#{$prefix}box-shadow-inset) !default;
 
-$input-border-radius:                   $border-radius !default;
-$input-border-radius-lg:                $border-radius-lg !default;
-$input-border-radius-sm:                $border-radius-sm !default;
+$input-border-radius:                   var(--#{$prefix}border-radius) !default;
+$input-border-radius-sm:                var(--#{$prefix}border-radius-sm) !default;
+$input-border-radius-lg:                var(--#{$prefix}border-radius-lg) !default;
 
 $input-focus-bg:                        $input-bg !default;
-$input-focus-border-color:              lighten($component-active-bg, 25%) !default;
+$input-focus-border-color:              tint-color($component-active-bg, 50%) !default;
 $input-focus-color:                     $input-color !default;
 $input-focus-width:                     $input-btn-focus-width !default;
 $input-focus-box-shadow:                $input-btn-focus-box-shadow !default;
 
-$input-placeholder-color:               $gray-600 !default;
-$input-plaintext-color:                 $body-color !default;
+$input-placeholder-color:               var(--#{$prefix}secondary-color) !default;
+$input-plaintext-color:                 var(--#{$prefix}body-color) !default;
 
-$input-height-border:                   $input-border-width * 2 !default;
+$input-height-border:                   calc(#{$input-border-width} * 2) !default; // stylelint-disable-line function-disallowed-list
 
 $input-height-inner:                    add($input-line-height * 1em, $input-padding-y * 2) !default;
 $input-height-inner-half:               add($input-line-height * .5em, $input-padding-y) !default;
-$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y * 0.5) !default;
+$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y * .5) !default;
 
 $input-height:                          add($input-line-height * 1em, add($input-padding-y * 2, $input-height-border, false)) !default;
-$input-height-sm:                       add($input-line-height-sm * 1em, add($input-padding-y-sm * 2, $input-height-border, false)) !default;
-$input-height-lg:                       add($input-line-height-lg * 1em, add($input-padding-y-lg * 2, $input-height-border, false)) !default;
+$input-height-sm:                       add($input-line-height * 1em, add($input-padding-y-sm * 2, $input-height-border, false)) !default;
+$input-height-lg:                       add($input-line-height * 1em, add($input-padding-y-lg * 2, $input-height-border, false)) !default;
 
 $input-transition:                      border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
 
-$form-text-margin-top:                  .25rem !default;
-
-$form-check-input-gutter:               1.25rem !default;
-$form-check-input-margin-y:             .3rem !default;
-$form-check-input-margin-x:             .25rem !default;
-
-$form-check-inline-margin-x:            .75rem !default;
-$form-check-inline-input-margin-x:      .3125rem !default;
-
-$form-grid-gutter-width:                10px !default;
-$form-group-margin-bottom:              1rem !default;
-
+$form-color-width:                      3rem !default;
+// scss-docs-end form-input-variables
+
+// scss-docs-start form-check-variables
+$form-check-input-width:                  1em !default;
+$form-check-min-height:                   $font-size-base * $line-height-base !default;
+$form-check-padding-start:                $form-check-input-width + .5em !default;
+$form-check-margin-bottom:                .125rem !default;
+$form-check-label-color:                  null !default;
+$form-check-label-cursor:                 null !default;
+$form-check-transition:                   null !default;
+
+$form-check-input-active-filter:          brightness(90%) !default;
+
+$form-check-input-bg:                     $input-bg !default;
+$form-check-input-border:                 var(--#{$prefix}border-width) solid var(--#{$prefix}border-color) !default;
+$form-check-input-border-radius:          .25em !default;
+$form-check-radio-border-radius:          50% !default;
+$form-check-input-focus-border:           $input-focus-border-color !default;
+$form-check-input-focus-box-shadow:       $focus-ring-box-shadow !default;
+
+$form-check-input-checked-color:          $component-active-color !default;
+$form-check-input-checked-bg-color:       $component-active-bg !default;
+$form-check-input-checked-border-color:   $form-check-input-checked-bg-color !default;
+$form-check-input-checked-bg-image:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$form-check-input-checked-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/></svg>") !default;
+$form-check-radio-checked-bg-image:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='2' fill='#{$form-check-input-checked-color}'/></svg>") !default;
+
+$form-check-input-indeterminate-color:          $component-active-color !default;
+$form-check-input-indeterminate-bg-color:       $component-active-bg !default;
+$form-check-input-indeterminate-border-color:   $form-check-input-indeterminate-bg-color !default;
+$form-check-input-indeterminate-bg-image:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><path fill='none' stroke='#{$form-check-input-indeterminate-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10h8'/></svg>") !default;
+
+$form-check-input-disabled-opacity:        .5 !default;
+$form-check-label-disabled-opacity:        $form-check-input-disabled-opacity !default;
+$form-check-btn-check-disabled-opacity:    $btn-disabled-opacity !default;
+
+$form-check-inline-margin-end:    1rem !default;
+// scss-docs-end form-check-variables
+
+// scss-docs-start form-switch-variables
+$form-switch-color:               rgba($black, .25) !default;
+$form-switch-width:               2em !default;
+$form-switch-padding-start:       $form-switch-width + .5em !default;
+$form-switch-bg-image:            url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-color}'/></svg>") !default;
+$form-switch-border-radius:       $form-switch-width !default;
+$form-switch-transition:          background-position .15s ease-in-out !default;
+
+$form-switch-focus-color:         $input-focus-border-color !default;
+$form-switch-focus-bg-image:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-focus-color}'/></svg>") !default;
+
+$form-switch-checked-color:       $component-active-color !default;
+$form-switch-checked-bg-image:    url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#{$form-switch-checked-color}'/></svg>") !default;
+$form-switch-checked-bg-position: right center !default;
+// scss-docs-end form-switch-variables
+
+// scss-docs-start input-group-variables
+$input-group-addon-padding-y:           $input-padding-y !default;
+$input-group-addon-padding-x:           $input-padding-x !default;
+$input-group-addon-font-weight:         $input-font-weight !default;
 $input-group-addon-color:               $input-color !default;
-$input-group-addon-bg:                  $gray-200 !default;
+$input-group-addon-bg:                  var(--#{$prefix}tertiary-bg) !default;
 $input-group-addon-border-color:        $input-border-color !default;
-
-$custom-forms-transition:               background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
-
-$custom-control-gutter:                 .5rem !default;
-$custom-control-spacer-x:               1rem !default;
-$custom-control-cursor:                 null !default;
-
-$custom-control-indicator-size:         1rem !default;
-$custom-control-indicator-bg:           $input-bg !default;
-
-$custom-control-indicator-bg-size:      50% 50% !default;
-$custom-control-indicator-box-shadow:   $input-box-shadow !default;
-$custom-control-indicator-border-color: $gray-500 !default;
-$custom-control-indicator-border-width: $input-border-width !default;
-
-$custom-control-label-color:            null !default;
-
-$custom-control-indicator-disabled-bg:          $input-disabled-bg !default;
-$custom-control-label-disabled-color:           $gray-600 !default;
-
-$custom-control-indicator-checked-color:        $component-active-color !default;
-$custom-control-indicator-checked-bg:           $component-active-bg !default;
-$custom-control-indicator-checked-disabled-bg:  rgba(theme-color("primary"), .5) !default;
-$custom-control-indicator-checked-box-shadow:   null !default;
-$custom-control-indicator-checked-border-color: $custom-control-indicator-checked-bg !default;
-
-$custom-control-indicator-focus-box-shadow:     $input-focus-box-shadow !default;
-$custom-control-indicator-focus-border-color:   $input-focus-border-color !default;
-
-$custom-control-indicator-active-color:         $component-active-color !default;
-$custom-control-indicator-active-bg:            lighten($component-active-bg, 35%) !default;
-$custom-control-indicator-active-box-shadow:    null !default;
-$custom-control-indicator-active-border-color:  $custom-control-indicator-active-bg !default;
-
-$custom-checkbox-indicator-border-radius:       $border-radius !default;
-$custom-checkbox-indicator-icon-checked:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'><path fill='#{$custom-control-indicator-checked-color}' d='M6.564.75l-3.59 3.612-1.538-1.55L0 4.26l2.974 2.99L8 2.193z'/></svg>") !default;
-
-$custom-checkbox-indicator-indeterminate-bg:           $component-active-bg !default;
-$custom-checkbox-indicator-indeterminate-color:        $custom-control-indicator-checked-color !default;
-$custom-checkbox-indicator-icon-indeterminate:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'><path stroke='#{$custom-checkbox-indicator-indeterminate-color}' d='M0 2h4'/></svg>") !default;
-$custom-checkbox-indicator-indeterminate-box-shadow:   null !default;
-$custom-checkbox-indicator-indeterminate-border-color: $custom-checkbox-indicator-indeterminate-bg !default;
-
-$custom-radio-indicator-border-radius:          50% !default;
-$custom-radio-indicator-icon-checked:           url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='-4 -4 8 8'><circle r='3' fill='#{$custom-control-indicator-checked-color}'/></svg>") !default;
-
-$custom-switch-width:                           $custom-control-indicator-size * 1.75 !default;
-$custom-switch-indicator-border-radius:         $custom-control-indicator-size * 0.5 !default;
-$custom-switch-indicator-size:                  subtract($custom-control-indicator-size, $custom-control-indicator-border-width * 4) !default;
-
-$custom-select-padding-y:           $input-padding-y !default;
-$custom-select-padding-x:           $input-padding-x !default;
-$custom-select-font-family:         $input-font-family !default;
-$custom-select-font-size:           $input-font-size !default;
-$custom-select-height:              $input-height !default;
-$custom-select-indicator-padding:   1rem !default; // Extra padding to account for the presence of the background-image based indicator
-$custom-select-font-weight:         $input-font-weight !default;
-$custom-select-line-height:         $input-line-height !default;
-$custom-select-color:               $input-color !default;
-$custom-select-disabled-color:      $gray-600 !default;
-$custom-select-bg:                  $input-bg !default;
-$custom-select-disabled-bg:         $gray-200 !default;
-$custom-select-bg-size:             8px 10px !default; // In pixels because image dimensions
-$custom-select-indicator-color:     $gray-800 !default;
-$custom-select-indicator:           url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='5' viewBox='0 0 4 5'><path fill='#{$custom-select-indicator-color}' d='M2 0L0 2h4zm0 5L0 3h4z'/></svg>") !default;
-$custom-select-background:          escape-svg($custom-select-indicator) right $custom-select-padding-x center / $custom-select-bg-size no-repeat !default; // Used so we can have multiple background elements (e.g., arrow and feedback icon)
-
-$custom-select-feedback-icon-padding-right: add(1em * .75, (2 * $custom-select-padding-y * .75) + $custom-select-padding-x + $custom-select-indicator-padding) !default;
-$custom-select-feedback-icon-position:      center right ($custom-select-padding-x + $custom-select-indicator-padding) !default;
-$custom-select-feedback-icon-size:          $input-height-inner-half $input-height-inner-half !default;
-
-$custom-select-border-width:        $input-border-width !default;
-$custom-select-border-color:        $input-border-color !default;
-$custom-select-border-radius:       $border-radius !default;
-$custom-select-box-shadow:          inset 0 1px 2px rgba($black, .075) !default;
-
-$custom-select-focus-border-color:  $input-focus-border-color !default;
-$custom-select-focus-width:         $input-focus-width !default;
-$custom-select-focus-box-shadow:    0 0 0 $custom-select-focus-width $input-btn-focus-color !default;
-
-$custom-select-padding-y-sm:        $input-padding-y-sm !default;
-$custom-select-padding-x-sm:        $input-padding-x-sm !default;
-$custom-select-font-size-sm:        $input-font-size-sm !default;
-$custom-select-height-sm:           $input-height-sm !default;
-
-$custom-select-padding-y-lg:        $input-padding-y-lg !default;
-$custom-select-padding-x-lg:        $input-padding-x-lg !default;
-$custom-select-font-size-lg:        $input-font-size-lg !default;
-$custom-select-height-lg:           $input-height-lg !default;
-
-$custom-range-track-width:          100% !default;
-$custom-range-track-height:         .5rem !default;
-$custom-range-track-cursor:         pointer !default;
-$custom-range-track-bg:             $gray-300 !default;
-$custom-range-track-border-radius:  1rem !default;
-$custom-range-track-box-shadow:     inset 0 .25rem .25rem rgba($black, .1) !default;
-
-$custom-range-thumb-width:                   1rem !default;
-$custom-range-thumb-height:                  $custom-range-thumb-width !default;
-$custom-range-thumb-bg:                      $component-active-bg !default;
-$custom-range-thumb-border:                  0 !default;
-$custom-range-thumb-border-radius:           1rem !default;
-$custom-range-thumb-box-shadow:              0 .1rem .25rem rgba($black, .1) !default;
-$custom-range-thumb-focus-box-shadow:        0 0 0 1px $body-bg, $input-focus-box-shadow !default;
-$custom-range-thumb-focus-box-shadow-width:  $input-focus-width !default; // For focus box shadow issue in IE/Edge
-$custom-range-thumb-active-bg:               lighten($component-active-bg, 35%) !default;
-$custom-range-thumb-disabled-bg:             $gray-500 !default;
-
-$custom-file-height:                $input-height !default;
-$custom-file-height-inner:          $input-height-inner !default;
-$custom-file-focus-border-color:    $input-focus-border-color !default;
-$custom-file-focus-box-shadow:      $input-focus-box-shadow !default;
-$custom-file-disabled-bg:           $input-disabled-bg !default;
-
-$custom-file-padding-y:             $input-padding-y !default;
-$custom-file-padding-x:             $input-padding-x !default;
-$custom-file-line-height:           $input-line-height !default;
-$custom-file-font-family:           $input-font-family !default;
-$custom-file-font-weight:           $input-font-weight !default;
-$custom-file-color:                 $input-color !default;
-$custom-file-bg:                    $input-bg !default;
-$custom-file-border-width:          $input-border-width !default;
-$custom-file-border-color:          $input-border-color !default;
-$custom-file-border-radius:         $input-border-radius !default;
-$custom-file-box-shadow:            $input-box-shadow !default;
-$custom-file-button-color:          $custom-file-color !default;
-$custom-file-button-bg:             $input-group-addon-bg !default;
-$custom-file-text: (
-  en: "Browse"
-) !default;
-
+// scss-docs-end input-group-variables
+
+// scss-docs-start form-select-variables
+$form-select-padding-y:             $input-padding-y !default;
+$form-select-padding-x:             $input-padding-x !default;
+$form-select-font-family:           $input-font-family !default;
+$form-select-font-size:             $input-font-size !default;
+$form-select-indicator-padding:     $form-select-padding-x * 3 !default; // Extra padding for background-image
+$form-select-font-weight:           $input-font-weight !default;
+$form-select-line-height:           $input-line-height !default;
+$form-select-color:                 $input-color !default;
+$form-select-bg:                    $input-bg !default;
+$form-select-disabled-color:        null !default;
+$form-select-disabled-bg:           $input-disabled-bg !default;
+$form-select-disabled-border-color: $input-disabled-border-color !default;
+$form-select-bg-position:           right $form-select-padding-x center !default;
+$form-select-bg-size:               16px 12px !default; // In pixels because image dimensions
+$form-select-indicator-color:       $gray-800 !default;
+$form-select-indicator:             url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='none' stroke='#{$form-select-indicator-color}' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/></svg>") !default;
+
+$form-select-feedback-icon-padding-end: $form-select-padding-x * 2.5 + $form-select-indicator-padding !default;
+$form-select-feedback-icon-position:    center right $form-select-indicator-padding !default;
+$form-select-feedback-icon-size:        $input-height-inner-half $input-height-inner-half !default;
+
+$form-select-border-width:        $input-border-width !default;
+$form-select-border-color:        $input-border-color !default;
+$form-select-border-radius:       $input-border-radius !default;
+$form-select-box-shadow:          var(--#{$prefix}box-shadow-inset) !default;
+
+$form-select-focus-border-color:  $input-focus-border-color !default;
+$form-select-focus-width:         $input-focus-width !default;
+$form-select-focus-box-shadow:    0 0 0 $form-select-focus-width $input-btn-focus-color !default;
+
+$form-select-padding-y-sm:        $input-padding-y-sm !default;
+$form-select-padding-x-sm:        $input-padding-x-sm !default;
+$form-select-font-size-sm:        $input-font-size-sm !default;
+$form-select-border-radius-sm:    $input-border-radius-sm !default;
+
+$form-select-padding-y-lg:        $input-padding-y-lg !default;
+$form-select-padding-x-lg:        $input-padding-x-lg !default;
+$form-select-font-size-lg:        $input-font-size-lg !default;
+$form-select-border-radius-lg:    $input-border-radius-lg !default;
+
+$form-select-transition:          $input-transition !default;
+// scss-docs-end form-select-variables
+
+// scss-docs-start form-range-variables
+$form-range-track-width:          100% !default;
+$form-range-track-height:         .5rem !default;
+$form-range-track-cursor:         pointer !default;
+$form-range-track-bg:             var(--#{$prefix}secondary-bg) !default;
+$form-range-track-border-radius:  1rem !default;
+$form-range-track-box-shadow:     var(--#{$prefix}box-shadow-inset) !default;
+
+$form-range-thumb-width:                   1rem !default;
+$form-range-thumb-height:                  $form-range-thumb-width !default;
+$form-range-thumb-bg:                      $component-active-bg !default;
+$form-range-thumb-border:                  0 !default;
+$form-range-thumb-border-radius:           1rem !default;
+$form-range-thumb-box-shadow:              0 .1rem .25rem rgba($black, .1) !default;
+$form-range-thumb-focus-box-shadow:        0 0 0 1px $body-bg, $input-focus-box-shadow !default;
+$form-range-thumb-focus-box-shadow-width:  $input-focus-width !default; // For focus box shadow issue in Edge
+$form-range-thumb-active-bg:               tint-color($component-active-bg, 70%) !default;
+$form-range-thumb-disabled-bg:             var(--#{$prefix}secondary-color) !default;
+$form-range-thumb-transition:              background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
+// scss-docs-end form-range-variables
+
+// scss-docs-start form-file-variables
+$form-file-button-color:          $input-color !default;
+$form-file-button-bg:             var(--#{$prefix}tertiary-bg) !default;
+$form-file-button-hover-bg:       var(--#{$prefix}secondary-bg) !default;
+// scss-docs-end form-file-variables
+
+// scss-docs-start form-floating-variables
+$form-floating-height:                  add(3.5rem, $input-height-border) !default;
+$form-floating-line-height:             1.25 !default;
+$form-floating-padding-x:               $input-padding-x !default;
+$form-floating-padding-y:               1rem !default;
+$form-floating-input-padding-t:         1.625rem !default;
+$form-floating-input-padding-b:         .625rem !default;
+$form-floating-label-height:            1.5em !default;
+$form-floating-label-opacity:           .65 !default;
+$form-floating-label-transform:         scale(.85) translateY(-.5rem) translateX(.15rem) !default;
+$form-floating-label-disabled-color:    $gray-600 !default;
+$form-floating-transition:              opacity .1s ease-in-out, transform .1s ease-in-out !default;
+// scss-docs-end form-floating-variables
 
 // Form validation
 
+// scss-docs-start form-feedback-variables
 $form-feedback-margin-top:          $form-text-margin-top !default;
-$form-feedback-font-size:           $small-font-size !default;
-$form-feedback-valid-color:         theme-color("success") !default;
-$form-feedback-invalid-color:       theme-color("danger") !default;
+$form-feedback-font-size:           $form-text-font-size !default;
+$form-feedback-font-style:          $form-text-font-style !default;
+$form-feedback-valid-color:         $success !default;
+$form-feedback-invalid-color:       $danger !default;
 
 $form-feedback-icon-valid-color:    $form-feedback-valid-color !default;
-$form-feedback-icon-valid:          url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'><path fill='#{$form-feedback-icon-valid-color}' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/></svg>") !default;
+$form-feedback-icon-valid:          url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'><path fill='#{$form-feedback-icon-valid-color}' d='M2.3 6.73.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/></svg>") !default;
 $form-feedback-icon-invalid-color:  $form-feedback-invalid-color !default;
-$form-feedback-icon-invalid:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='#{$form-feedback-icon-invalid-color}' viewBox='0 0 12 12'><circle cx='6' cy='6' r='4.5'/><path stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/><circle cx='6' cy='8.2' r='.6' fill='#{$form-feedback-icon-invalid-color}' stroke='none'/></svg>") !default;
-
-$form-validation-states: () !default;
-$form-validation-states: map-merge(
-  (
-    "valid": (
-      "color": $form-feedback-valid-color,
-      "icon": $form-feedback-icon-valid
-    ),
-    "invalid": (
-      "color": $form-feedback-invalid-color,
-      "icon": $form-feedback-icon-invalid
-    ),
+$form-feedback-icon-invalid:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='#{$form-feedback-icon-invalid-color}'><circle cx='6' cy='6' r='4.5'/><path stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/><circle cx='6' cy='8.2' r='.6' fill='#{$form-feedback-icon-invalid-color}' stroke='none'/></svg>") !default;
+// scss-docs-end form-feedback-variables
+
+// scss-docs-start form-validation-colors
+$form-valid-color:                  $form-feedback-valid-color !default;
+$form-valid-border-color:           $form-feedback-valid-color !default;
+$form-invalid-color:                $form-feedback-invalid-color !default;
+$form-invalid-border-color:         $form-feedback-invalid-color !default;
+// scss-docs-end form-validation-colors
+
+// scss-docs-start form-validation-states
+$form-validation-states: (
+  "valid": (
+    "color": var(--#{$prefix}form-valid-color),
+    "icon": $form-feedback-icon-valid,
+    "tooltip-color": #fff,
+    "tooltip-bg-color": var(--#{$prefix}success),
+    "focus-box-shadow": 0 0 $input-btn-focus-blur $input-focus-width rgba(var(--#{$prefix}success-rgb), $input-btn-focus-color-opacity),
+    "border-color": var(--#{$prefix}form-valid-border-color),
   ),
-  $form-validation-states
-);
+  "invalid": (
+    "color": var(--#{$prefix}form-invalid-color),
+    "icon": $form-feedback-icon-invalid,
+    "tooltip-color": #fff,
+    "tooltip-bg-color": var(--#{$prefix}danger),
+    "focus-box-shadow": 0 0 $input-btn-focus-blur $input-focus-width rgba(var(--#{$prefix}danger-rgb), $input-btn-focus-color-opacity),
+    "border-color": var(--#{$prefix}form-invalid-border-color),
+  )
+) !default;
+// scss-docs-end form-validation-states
 
 // Z-index master list
 //
 // Warning: Avoid customizing these values. They're used for a bird's eye view
 // of components dependent on the z-axis and are designed to all work together.
 
+// scss-docs-start zindex-stack
 $zindex-dropdown:                   1000 !default;
 $zindex-sticky:                     1020 !default;
 $zindex-fixed:                      1030 !default;
-$zindex-modal-backdrop:             1040 !default;
-$zindex-modal:                      1050 !default;
-$zindex-popover:                    1060 !default;
-$zindex-tooltip:                    1070 !default;
+$zindex-offcanvas-backdrop:         1040 !default;
+$zindex-offcanvas:                  1045 !default;
+$zindex-modal-backdrop:             1050 !default;
+$zindex-modal:                      1055 !default;
+$zindex-popover:                    1070 !default;
+$zindex-tooltip:                    1080 !default;
+$zindex-toast:                      1090 !default;
+// scss-docs-end zindex-stack
+
+// scss-docs-start zindex-levels-map
+$zindex-levels: (
+  n1: -1,
+  0: 0,
+  1: 1,
+  2: 2,
+  3: 3
+) !default;
+// scss-docs-end zindex-levels-map
 
 
 // Navs
 
+// scss-docs-start nav-variables
 $nav-link-padding-y:                .5rem !default;
 $nav-link-padding-x:                1rem !default;
-$nav-link-disabled-color:           $gray-600 !default;
-
-$nav-tabs-border-color:             $gray-300 !default;
-$nav-tabs-border-width:             $border-width !default;
-$nav-tabs-border-radius:            $border-radius !default;
-$nav-tabs-link-hover-border-color:  $gray-200 $gray-200 $nav-tabs-border-color !default;
-$nav-tabs-link-active-color:        $gray-700 !default;
-$nav-tabs-link-active-bg:           $body-bg !default;
-$nav-tabs-link-active-border-color: $gray-300 $gray-300 $nav-tabs-link-active-bg !default;
-
-$nav-pills-border-radius:           $border-radius !default;
+$nav-link-font-size:                null !default;
+$nav-link-font-weight:              null !default;
+$nav-link-color:                    var(--#{$prefix}link-color) !default;
+$nav-link-hover-color:              var(--#{$prefix}link-hover-color) !default;
+$nav-link-transition:               color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out !default;
+$nav-link-disabled-color:           var(--#{$prefix}secondary-color) !default;
+$nav-link-focus-box-shadow:         $focus-ring-box-shadow !default;
+
+$nav-tabs-border-color:             var(--#{$prefix}border-color) !default;
+$nav-tabs-border-width:             var(--#{$prefix}border-width) !default;
+$nav-tabs-border-radius:            var(--#{$prefix}border-radius) !default;
+$nav-tabs-link-hover-border-color:  var(--#{$prefix}secondary-bg) var(--#{$prefix}secondary-bg) $nav-tabs-border-color !default;
+$nav-tabs-link-active-color:        var(--#{$prefix}emphasis-color) !default;
+$nav-tabs-link-active-bg:           var(--#{$prefix}body-bg) !default;
+$nav-tabs-link-active-border-color: var(--#{$prefix}border-color) var(--#{$prefix}border-color) $nav-tabs-link-active-bg !default;
+
+$nav-pills-border-radius:           var(--#{$prefix}border-radius) !default;
 $nav-pills-link-active-color:       $component-active-color !default;
 $nav-pills-link-active-bg:          $component-active-bg !default;
 
-$nav-divider-color:                 $gray-200 !default;
-$nav-divider-margin-y:              $spacer * 0.5 !default;
+$nav-underline-gap:                 1rem !default;
+$nav-underline-border-width:        .125rem !default;
+$nav-underline-link-active-color:   var(--#{$prefix}emphasis-color) !default;
+// scss-docs-end nav-variables
 
 
 // Navbar
 
-$navbar-padding-y:                  $spacer * 0.5 !default;
-$navbar-padding-x:                  $spacer !default;
+// scss-docs-start navbar-variables
+$navbar-padding-y:                  $spacer * .5 !default;
+$navbar-padding-x:                  null !default;
 
 $navbar-nav-link-padding-x:         .5rem !default;
 
@@ -724,227 +1196,308 @@ $navbar-brand-font-size:            $font-size-lg !default;
 // Compute the navbar-brand padding-y so the navbar-brand will have the same height as navbar-text and nav-link
 $nav-link-height:                   $font-size-base * $line-height-base + $nav-link-padding-y * 2 !default;
 $navbar-brand-height:               $navbar-brand-font-size * $line-height-base !default;
-$navbar-brand-padding-y:            ($nav-link-height - $navbar-brand-height) * 0.5 !default;
+$navbar-brand-padding-y:            ($nav-link-height - $navbar-brand-height) * .5 !default;
+$navbar-brand-margin-end:           1rem !default;
 
 $navbar-toggler-padding-y:          .25rem !default;
 $navbar-toggler-padding-x:          .75rem !default;
 $navbar-toggler-font-size:          $font-size-lg !default;
 $navbar-toggler-border-radius:      $btn-border-radius !default;
-
-$navbar-nav-scroll-max-height:      75vh !default;
-
-$navbar-dark-color:                 rgba($white, .5) !default;
+$navbar-toggler-focus-width:        $btn-focus-width !default;
+$navbar-toggler-transition:         box-shadow .15s ease-in-out !default;
+
+$navbar-light-color:                rgba(var(--#{$prefix}emphasis-color-rgb), .65) !default;
+$navbar-light-hover-color:          rgba(var(--#{$prefix}emphasis-color-rgb), .8) !default;
+$navbar-light-active-color:         rgba(var(--#{$prefix}emphasis-color-rgb), 1) !default;
+$navbar-light-disabled-color:       rgba(var(--#{$prefix}emphasis-color-rgb), .3) !default;
+$navbar-light-icon-color:           rgba($body-color, .75) !default;
+$navbar-light-toggler-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path stroke='#{$navbar-light-icon-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
+$navbar-light-toggler-border-color: rgba(var(--#{$prefix}emphasis-color-rgb), .15) !default;
+$navbar-light-brand-color:          $navbar-light-active-color !default;
+$navbar-light-brand-hover-color:    $navbar-light-active-color !default;
+// scss-docs-end navbar-variables
+
+// scss-docs-start navbar-dark-variables
+$navbar-dark-color:                 rgba($white, .55) !default;
 $navbar-dark-hover-color:           rgba($white, .75) !default;
 $navbar-dark-active-color:          $white !default;
 $navbar-dark-disabled-color:        rgba($white, .25) !default;
-$navbar-dark-toggler-icon-bg:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'><path stroke='#{$navbar-dark-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
+$navbar-dark-icon-color:            $navbar-dark-color !default;
+$navbar-dark-toggler-icon-bg:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path stroke='#{$navbar-dark-icon-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
 $navbar-dark-toggler-border-color:  rgba($white, .1) !default;
-
-$navbar-light-color:                rgba($black, .5) !default;
-$navbar-light-hover-color:          rgba($black, .7) !default;
-$navbar-light-active-color:         rgba($black, .9) !default;
-$navbar-light-disabled-color:       rgba($black, .3) !default;
-$navbar-light-toggler-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'><path stroke='#{$navbar-light-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
-$navbar-light-toggler-border-color: rgba($black, .1) !default;
-
-$navbar-light-brand-color:                $navbar-light-active-color !default;
-$navbar-light-brand-hover-color:          $navbar-light-active-color !default;
-$navbar-dark-brand-color:                 $navbar-dark-active-color !default;
-$navbar-dark-brand-hover-color:           $navbar-dark-active-color !default;
+$navbar-dark-brand-color:           $navbar-dark-active-color !default;
+$navbar-dark-brand-hover-color:     $navbar-dark-active-color !default;
+// scss-docs-end navbar-dark-variables
 
 
 // Dropdowns
 //
 // Dropdown menu container and contents.
 
+// scss-docs-start dropdown-variables
 $dropdown-min-width:                10rem !default;
 $dropdown-padding-x:                0 !default;
 $dropdown-padding-y:                .5rem !default;
 $dropdown-spacer:                   .125rem !default;
 $dropdown-font-size:                $font-size-base !default;
-$dropdown-color:                    $body-color !default;
-$dropdown-bg:                       $white !default;
-$dropdown-border-color:             rgba($black, .15) !default;
-$dropdown-border-radius:            $border-radius !default;
-$dropdown-border-width:             $border-width !default;
-$dropdown-inner-border-radius:      subtract($dropdown-border-radius, $dropdown-border-width) !default;
-$dropdown-divider-bg:               $gray-200 !default;
-$dropdown-divider-margin-y:         $nav-divider-margin-y !default;
-$dropdown-box-shadow:               0 .5rem 1rem rgba($black, .175) !default;
-
-$dropdown-link-color:               $gray-900 !default;
-$dropdown-link-hover-color:         darken($gray-900, 5%) !default;
-$dropdown-link-hover-bg:            $gray-200 !default;
+$dropdown-color:                    var(--#{$prefix}body-color) !default;
+$dropdown-bg:                       var(--#{$prefix}body-bg) !default;
+$dropdown-border-color:             var(--#{$prefix}border-color-translucent) !default;
+$dropdown-border-radius:            var(--#{$prefix}border-radius) !default;
+$dropdown-border-width:             var(--#{$prefix}border-width) !default;
+$dropdown-inner-border-radius:      calc(#{$dropdown-border-radius} - #{$dropdown-border-width}) !default; // stylelint-disable-line function-disallowed-list
+$dropdown-divider-bg:               $dropdown-border-color !default;
+$dropdown-divider-margin-y:         $spacer * .5 !default;
+$dropdown-box-shadow:               var(--#{$prefix}box-shadow) !default;
+
+$dropdown-link-color:               var(--#{$prefix}body-color) !default;
+$dropdown-link-hover-color:         $dropdown-link-color !default;
+$dropdown-link-hover-bg:            var(--#{$prefix}tertiary-bg) !default;
 
 $dropdown-link-active-color:        $component-active-color !default;
 $dropdown-link-active-bg:           $component-active-bg !default;
 
-$dropdown-link-disabled-color:      $gray-500 !default;
+$dropdown-link-disabled-color:      var(--#{$prefix}tertiary-color) !default;
 
-$dropdown-item-padding-y:           .25rem !default;
-$dropdown-item-padding-x:           1.5rem !default;
+$dropdown-item-padding-y:           $spacer * .25 !default;
+$dropdown-item-padding-x:           $spacer !default;
 
 $dropdown-header-color:             $gray-600 !default;
-$dropdown-header-padding:           $dropdown-padding-y $dropdown-item-padding-x !default;
+$dropdown-header-padding-x:         $dropdown-item-padding-x !default;
+$dropdown-header-padding-y:         $dropdown-padding-y !default;
+// fusv-disable
+$dropdown-header-padding:           $dropdown-header-padding-y $dropdown-header-padding-x !default; // Deprecated in v5.2.0
+// fusv-enable
+// scss-docs-end dropdown-variables
+
+// scss-docs-start dropdown-dark-variables
+$dropdown-dark-color:               $gray-300 !default;
+$dropdown-dark-bg:                  $gray-800 !default;
+$dropdown-dark-border-color:        $dropdown-border-color !default;
+$dropdown-dark-divider-bg:          $dropdown-divider-bg !default;
+$dropdown-dark-box-shadow:          null !default;
+$dropdown-dark-link-color:          $dropdown-dark-color !default;
+$dropdown-dark-link-hover-color:    $white !default;
+$dropdown-dark-link-hover-bg:       rgba($white, .15) !default;
+$dropdown-dark-link-active-color:   $dropdown-link-active-color !default;
+$dropdown-dark-link-active-bg:      $dropdown-link-active-bg !default;
+$dropdown-dark-link-disabled-color: $gray-500 !default;
+$dropdown-dark-header-color:        $gray-500 !default;
+// scss-docs-end dropdown-dark-variables
 
 
 // Pagination
 
-$pagination-padding-y:              .5rem !default;
+// scss-docs-start pagination-variables
+$pagination-padding-y:              .375rem !default;
 $pagination-padding-x:              .75rem !default;
 $pagination-padding-y-sm:           .25rem !default;
 $pagination-padding-x-sm:           .5rem !default;
 $pagination-padding-y-lg:           .75rem !default;
 $pagination-padding-x-lg:           1.5rem !default;
-$pagination-line-height:            1.25 !default;
 
-$pagination-color:                  $link-color !default;
-$pagination-bg:                     $white !default;
-$pagination-border-width:           $border-width !default;
-$pagination-border-color:           $gray-300 !default;
+$pagination-font-size:              $font-size-base !default;
+
+$pagination-color:                  var(--#{$prefix}link-color) !default;
+$pagination-bg:                     var(--#{$prefix}body-bg) !default;
+$pagination-border-radius:          var(--#{$prefix}border-radius) !default;
+$pagination-border-width:           var(--#{$prefix}border-width) !default;
+$pagination-margin-start:           calc(#{$pagination-border-width} * -1) !default; // stylelint-disable-line function-disallowed-list
+$pagination-border-color:           var(--#{$prefix}border-color) !default;
 
-$pagination-focus-box-shadow:       $input-btn-focus-box-shadow !default;
+$pagination-focus-color:            var(--#{$prefix}link-hover-color) !default;
+$pagination-focus-bg:               var(--#{$prefix}secondary-bg) !default;
+$pagination-focus-box-shadow:       $focus-ring-box-shadow !default;
 $pagination-focus-outline:          0 !default;
 
-$pagination-hover-color:            $link-hover-color !default;
-$pagination-hover-bg:               $gray-200 !default;
-$pagination-hover-border-color:     $gray-300 !default;
+$pagination-hover-color:            var(--#{$prefix}link-hover-color) !default;
+$pagination-hover-bg:               var(--#{$prefix}tertiary-bg) !default;
+$pagination-hover-border-color:     var(--#{$prefix}border-color) !default; // Todo in v6: remove this?
 
 $pagination-active-color:           $component-active-color !default;
 $pagination-active-bg:              $component-active-bg !default;
-$pagination-active-border-color:    $pagination-active-bg !default;
+$pagination-active-border-color:    $component-active-bg !default;
 
-$pagination-disabled-color:         $gray-600 !default;
-$pagination-disabled-bg:            $white !default;
-$pagination-disabled-border-color:  $gray-300 !default;
+$pagination-disabled-color:         var(--#{$prefix}secondary-color) !default;
+$pagination-disabled-bg:            var(--#{$prefix}secondary-bg) !default;
+$pagination-disabled-border-color:  var(--#{$prefix}border-color) !default;
 
-$pagination-border-radius-sm:       $border-radius-sm !default;
-$pagination-border-radius-lg:       $border-radius-lg !default;
+$pagination-transition:              color .15s ease-in-out, background-color .15s ease-in-out, border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
 
-// Jumbotron
+$pagination-border-radius-sm:       var(--#{$prefix}border-radius-sm) !default;
+$pagination-border-radius-lg:       var(--#{$prefix}border-radius-lg) !default;
+// scss-docs-end pagination-variables
 
-$jumbotron-padding:                 2rem !default;
-$jumbotron-color:                   null !default;
-$jumbotron-bg:                      $gray-200 !default;
 
+// Placeholders
+
+// scss-docs-start placeholders
+$placeholder-opacity-max:           .5 !default;
+$placeholder-opacity-min:           .2 !default;
+// scss-docs-end placeholders
 
 // Cards
 
-$card-spacer-y:                     .75rem !default;
-$card-spacer-x:                     1.25rem !default;
-$card-border-width:                 $border-width !default;
-$card-border-radius:                $border-radius !default;
-$card-border-color:                 rgba($black, .125) !default;
+// scss-docs-start card-variables
+$card-spacer-y:                     $spacer !default;
+$card-spacer-x:                     $spacer !default;
+$card-title-spacer-y:               $spacer * .5 !default;
+$card-title-color:                  null !default;
+$card-subtitle-color:               null !default;
+$card-border-width:                 var(--#{$prefix}border-width) !default;
+$card-border-color:                 var(--#{$prefix}border-color-translucent) !default;
+$card-border-radius:                var(--#{$prefix}border-radius) !default;
+$card-box-shadow:                   null !default;
 $card-inner-border-radius:          subtract($card-border-radius, $card-border-width) !default;
-$card-cap-bg:                       rgba($black, .03) !default;
+$card-cap-padding-y:                $card-spacer-y * .5 !default;
+$card-cap-padding-x:                $card-spacer-x !default;
+$card-cap-bg:                       rgba(var(--#{$prefix}body-color-rgb), .03) !default;
 $card-cap-color:                    null !default;
 $card-height:                       null !default;
 $card-color:                        null !default;
-$card-bg:                           $white !default;
-
-$card-img-overlay-padding:          1.25rem !default;
-
-$card-group-margin:                 $grid-gutter-width * 0.5 !default;
-$card-deck-margin:                  $card-group-margin !default;
-
-$card-columns-count:                3 !default;
-$card-columns-gap:                  1.25rem !default;
-$card-columns-margin:               $card-spacer-y !default;
-
+$card-bg:                           var(--#{$prefix}body-bg) !default;
+$card-img-overlay-padding:          $spacer !default;
+$card-group-margin:                 $grid-gutter-width * .5 !default;
+// scss-docs-end card-variables
+
+// Accordion
+
+// scss-docs-start accordion-variables
+$accordion-padding-y:                     1rem !default;
+$accordion-padding-x:                     1.25rem !default;
+$accordion-color:                         var(--#{$prefix}body-color) !default;
+$accordion-bg:                            var(--#{$prefix}body-bg) !default;
+$accordion-border-width:                  var(--#{$prefix}border-width) !default;
+$accordion-border-color:                  var(--#{$prefix}border-color) !default;
+$accordion-border-radius:                 var(--#{$prefix}border-radius) !default;
+$accordion-inner-border-radius:           subtract($accordion-border-radius, $accordion-border-width) !default;
+
+$accordion-body-padding-y:                $accordion-padding-y !default;
+$accordion-body-padding-x:                $accordion-padding-x !default;
+
+$accordion-button-padding-y:              $accordion-padding-y !default;
+$accordion-button-padding-x:              $accordion-padding-x !default;
+$accordion-button-color:                  var(--#{$prefix}body-color) !default;
+$accordion-button-bg:                     var(--#{$prefix}accordion-bg) !default;
+$accordion-transition:                    $btn-transition, border-radius .15s ease !default;
+$accordion-button-active-bg:              var(--#{$prefix}primary-bg-subtle) !default;
+$accordion-button-active-color:           var(--#{$prefix}primary-text-emphasis) !default;
+
+$accordion-button-focus-border-color:     $input-focus-border-color !default;
+$accordion-button-focus-box-shadow:       $btn-focus-box-shadow !default;
+
+$accordion-icon-width:                    1.25rem !default;
+$accordion-icon-color:                    $body-color !default;
+$accordion-icon-active-color:             $primary-text-emphasis !default;
+$accordion-icon-transition:               transform .2s ease-in-out !default;
+$accordion-icon-transform:                rotate(-180deg) !default;
+
+$accordion-button-icon:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>") !default;
+$accordion-button-active-icon:  url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-active-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>") !default;
+// scss-docs-end accordion-variables
 
 // Tooltips
 
+// scss-docs-start tooltip-variables
 $tooltip-font-size:                 $font-size-sm !default;
 $tooltip-max-width:                 200px !default;
-$tooltip-color:                     $white !default;
-$tooltip-bg:                        $black !default;
-$tooltip-border-radius:             $border-radius !default;
+$tooltip-color:                     var(--#{$prefix}body-bg) !default;
+$tooltip-bg:                        var(--#{$prefix}emphasis-color) !default;
+$tooltip-border-radius:             var(--#{$prefix}border-radius) !default;
 $tooltip-opacity:                   .9 !default;
-$tooltip-padding-y:                 .25rem !default;
-$tooltip-padding-x:                 .5rem !default;
-$tooltip-margin:                    0 !default;
+$tooltip-padding-y:                 $spacer * .25 !default;
+$tooltip-padding-x:                 $spacer * .5 !default;
+$tooltip-margin:                    null !default; // TODO: remove this in v6
 
 $tooltip-arrow-width:               .8rem !default;
 $tooltip-arrow-height:              .4rem !default;
-$tooltip-arrow-color:               $tooltip-bg !default;
+// fusv-disable
+$tooltip-arrow-color:               null !default; // Deprecated in Bootstrap 5.2.0 for CSS variables
+// fusv-enable
+// scss-docs-end tooltip-variables
 
 // Form tooltips must come after regular tooltips
+// scss-docs-start tooltip-feedback-variables
 $form-feedback-tooltip-padding-y:     $tooltip-padding-y !default;
 $form-feedback-tooltip-padding-x:     $tooltip-padding-x !default;
 $form-feedback-tooltip-font-size:     $tooltip-font-size !default;
-$form-feedback-tooltip-line-height:   $line-height-base !default;
+$form-feedback-tooltip-line-height:   null !default;
 $form-feedback-tooltip-opacity:       $tooltip-opacity !default;
 $form-feedback-tooltip-border-radius: $tooltip-border-radius !default;
+// scss-docs-end tooltip-feedback-variables
 
 
 // Popovers
 
+// scss-docs-start popover-variables
 $popover-font-size:                 $font-size-sm !default;
-$popover-bg:                        $white !default;
+$popover-bg:                        var(--#{$prefix}body-bg) !default;
 $popover-max-width:                 276px !default;
-$popover-border-width:              $border-width !default;
-$popover-border-color:              rgba($black, .2) !default;
-$popover-border-radius:             $border-radius-lg !default;
-$popover-inner-border-radius:       subtract($popover-border-radius, $popover-border-width) !default;
-$popover-box-shadow:                0 .25rem .5rem rgba($black, .2) !default;
-
-$popover-header-bg:                 darken($popover-bg, 3%) !default;
+$popover-border-width:              var(--#{$prefix}border-width) !default;
+$popover-border-color:              var(--#{$prefix}border-color-translucent) !default;
+$popover-border-radius:             var(--#{$prefix}border-radius-lg) !default;
+$popover-inner-border-radius:       calc(#{$popover-border-radius} - #{$popover-border-width}) !default; // stylelint-disable-line function-disallowed-list
+$popover-box-shadow:                var(--#{$prefix}box-shadow) !default;
+
+$popover-header-font-size:          $font-size-base !default;
+$popover-header-bg:                 var(--#{$prefix}secondary-bg) !default;
 $popover-header-color:              $headings-color !default;
 $popover-header-padding-y:          .5rem !default;
-$popover-header-padding-x:          .75rem !default;
+$popover-header-padding-x:          $spacer !default;
 
-$popover-body-color:                $body-color !default;
-$popover-body-padding-y:            $popover-header-padding-y !default;
-$popover-body-padding-x:            $popover-header-padding-x !default;
+$popover-body-color:                var(--#{$prefix}body-color) !default;
+$popover-body-padding-y:            $spacer !default;
+$popover-body-padding-x:            $spacer !default;
 
 $popover-arrow-width:               1rem !default;
 $popover-arrow-height:              .5rem !default;
-$popover-arrow-color:               $popover-bg !default;
+// scss-docs-end popover-variables
 
-$popover-arrow-outer-color:         fade-in($popover-border-color, .05) !default;
+// fusv-disable
+// Deprecated in Bootstrap 5.2.0 for CSS variables
+$popover-arrow-color:               $popover-bg !default;
+$popover-arrow-outer-color:         var(--#{$prefix}border-color-translucent) !default;
+// fusv-enable
 
 
 // Toasts
 
+// scss-docs-start toast-variables
 $toast-max-width:                   350px !default;
 $toast-padding-x:                   .75rem !default;
-$toast-padding-y:                   .25rem !default;
+$toast-padding-y:                   .5rem !default;
 $toast-font-size:                   .875rem !default;
 $toast-color:                       null !default;
-$toast-background-color:            rgba($white, .85) !default;
-$toast-border-width:                1px !default;
-$toast-border-color:                rgba(0, 0, 0, .1) !default;
-$toast-border-radius:               .25rem !default;
-$toast-box-shadow:                  0 .25rem .75rem rgba($black, .1) !default;
+$toast-background-color:            rgba(var(--#{$prefix}body-bg-rgb), .85) !default;
+$toast-border-width:                var(--#{$prefix}border-width) !default;
+$toast-border-color:                var(--#{$prefix}border-color-translucent) !default;
+$toast-border-radius:               var(--#{$prefix}border-radius) !default;
+$toast-box-shadow:                  var(--#{$prefix}box-shadow) !default;
+$toast-spacing:                     $container-padding-x !default;
 
-$toast-header-color:                $gray-600 !default;
-$toast-header-background-color:     rgba($white, .85) !default;
-$toast-header-border-color:         rgba(0, 0, 0, .05) !default;
+$toast-header-color:                var(--#{$prefix}secondary-color) !default;
+$toast-header-background-color:     rgba(var(--#{$prefix}body-bg-rgb), .85) !default;
+$toast-header-border-color:         $toast-border-color !default;
+// scss-docs-end toast-variables
 
 
 // Badges
 
-$badge-font-size:                   75% !default;
+// scss-docs-start badge-variables
+$badge-font-size:                   .75em !default;
 $badge-font-weight:                 $font-weight-bold !default;
-$badge-padding-y:                   .25em !default;
-$badge-padding-x:                   .4em !default;
-$badge-border-radius:               $border-radius !default;
-
-$badge-transition:                  $btn-transition !default;
-$badge-focus-width:                 $input-btn-focus-width !default;
-
-$badge-pill-padding-x:              .6em !default;
-// Use a higher than normal value to ensure completely rounded edges when
-// customizing padding or font-size on labels.
-$badge-pill-border-radius:          10rem !default;
+$badge-color:                       $white !default;
+$badge-padding-y:                   .35em !default;
+$badge-padding-x:                   .65em !default;
+$badge-border-radius:               var(--#{$prefix}border-radius) !default;
+// scss-docs-end badge-variables
 
 
 // Modals
 
-// Padding applied to the modal body
-$modal-inner-padding:               1rem !default;
+// scss-docs-start modal-variables
+$modal-inner-padding:               $spacer !default;
 
-// Margin between elements in footer, must be lower than or equal to 2 * $modal-inner-padding
 $modal-footer-margin-between:       .5rem !default;
 
 $modal-dialog-margin:               .5rem !default;
@@ -953,126 +1506,145 @@ $modal-dialog-margin-y-sm-up:       1.75rem !default;
 $modal-title-line-height:           $line-height-base !default;
 
 $modal-content-color:               null !default;
-$modal-content-bg:                  $white !default;
-$modal-content-border-color:        rgba($black, .2) !default;
-$modal-content-border-width:        $border-width !default;
-$modal-content-border-radius:       $border-radius-lg !default;
+$modal-content-bg:                  var(--#{$prefix}body-bg) !default;
+$modal-content-border-color:        var(--#{$prefix}border-color-translucent) !default;
+$modal-content-border-width:        var(--#{$prefix}border-width) !default;
+$modal-content-border-radius:       var(--#{$prefix}border-radius-lg) !default;
 $modal-content-inner-border-radius: subtract($modal-content-border-radius, $modal-content-border-width) !default;
-$modal-content-box-shadow-xs:       0 .25rem .5rem rgba($black, .5) !default;
-$modal-content-box-shadow-sm-up:    0 .5rem 1rem rgba($black, .5) !default;
+$modal-content-box-shadow-xs:       var(--#{$prefix}box-shadow-sm) !default;
+$modal-content-box-shadow-sm-up:    var(--#{$prefix}box-shadow) !default;
 
 $modal-backdrop-bg:                 $black !default;
 $modal-backdrop-opacity:            .5 !default;
-$modal-header-border-color:         $border-color !default;
-$modal-footer-border-color:         $modal-header-border-color !default;
+
+$modal-header-border-color:         var(--#{$prefix}border-color) !default;
 $modal-header-border-width:         $modal-content-border-width !default;
-$modal-footer-border-width:         $modal-header-border-width !default;
-$modal-header-padding-y:            1rem !default;
-$modal-header-padding-x:            1rem !default;
+$modal-header-padding-y:            $modal-inner-padding !default;
+$modal-header-padding-x:            $modal-inner-padding !default;
 $modal-header-padding:              $modal-header-padding-y $modal-header-padding-x !default; // Keep this for backwards compatibility
 
-$modal-xl:                          1140px !default;
-$modal-lg:                          800px !default;
-$modal-md:                          500px !default;
+$modal-footer-bg:                   null !default;
+$modal-footer-border-color:         $modal-header-border-color !default;
+$modal-footer-border-width:         $modal-header-border-width !default;
+
 $modal-sm:                          300px !default;
+$modal-md:                          500px !default;
+$modal-lg:                          800px !default;
+$modal-xl:                          1140px !default;
 
 $modal-fade-transform:              translate(0, -50px) !default;
 $modal-show-transform:              none !default;
 $modal-transition:                  transform .3s ease-out !default;
 $modal-scale-transform:             scale(1.02) !default;
+// scss-docs-end modal-variables
 
 
 // Alerts
 //
 // Define alert colors, border radius, and padding.
 
-$alert-padding-y:                   .75rem !default;
-$alert-padding-x:                   1.25rem !default;
-$alert-margin-bottom:               1rem !default;
-$alert-border-radius:               $border-radius !default;
-$alert-link-font-weight:            $font-weight-bold !default;
-$alert-border-width:                $border-width !default;
-
-$alert-bg-level:                    -10 !default;
-$alert-border-level:                -9 !default;
-$alert-color-level:                 6 !default;
-
+// scss-docs-start alert-variables
+$alert-padding-y:               $spacer !default;
+$alert-padding-x:               $spacer !default;
+$alert-margin-bottom:           1rem !default;
+$alert-border-radius:           var(--#{$prefix}border-radius) !default;
+$alert-link-font-weight:        $font-weight-bold !default;
+$alert-border-width:            var(--#{$prefix}border-width) !default;
+$alert-dismissible-padding-r:   $alert-padding-x * 3 !default; // 3x covers width of x plus default padding on either side
+// scss-docs-end alert-variables
+
+// fusv-disable
+$alert-bg-scale:                -80% !default; // Deprecated in v5.2.0, to be removed in v6
+$alert-border-scale:            -70% !default; // Deprecated in v5.2.0, to be removed in v6
+$alert-color-scale:             40% !default; // Deprecated in v5.2.0, to be removed in v6
+// fusv-enable
 
 // Progress bars
 
+// scss-docs-start progress-variables
 $progress-height:                   1rem !default;
 $progress-font-size:                $font-size-base * .75 !default;
-$progress-bg:                       $gray-200 !default;
-$progress-border-radius:            $border-radius !default;
-$progress-box-shadow:               inset 0 .1rem .1rem rgba($black, .1) !default;
+$progress-bg:                       var(--#{$prefix}secondary-bg) !default;
+$progress-border-radius:            var(--#{$prefix}border-radius) !default;
+$progress-box-shadow:               var(--#{$prefix}box-shadow-inset) !default;
 $progress-bar-color:                $white !default;
-$progress-bar-bg:                   theme-color("primary") !default;
+$progress-bar-bg:                   $primary !default;
 $progress-bar-animation-timing:     1s linear infinite !default;
 $progress-bar-transition:           width .6s ease !default;
+// scss-docs-end progress-variables
 
 
 // List group
 
-$list-group-color:                  null !default;
-$list-group-bg:                     $white !default;
-$list-group-border-color:           rgba($black, .125) !default;
-$list-group-border-width:           $border-width !default;
-$list-group-border-radius:          $border-radius !default;
-
-$list-group-item-padding-y:         .75rem !default;
-$list-group-item-padding-x:         1.25rem !default;
-
-$list-group-hover-bg:               $gray-100 !default;
+// scss-docs-start list-group-variables
+$list-group-color:                  var(--#{$prefix}body-color) !default;
+$list-group-bg:                     var(--#{$prefix}body-bg) !default;
+$list-group-border-color:           var(--#{$prefix}border-color) !default;
+$list-group-border-width:           var(--#{$prefix}border-width) !default;
+$list-group-border-radius:          var(--#{$prefix}border-radius) !default;
+
+$list-group-item-padding-y:         $spacer * .5 !default;
+$list-group-item-padding-x:         $spacer !default;
+// fusv-disable
+$list-group-item-bg-scale:          -80% !default; // Deprecated in v5.3.0
+$list-group-item-color-scale:       40% !default; // Deprecated in v5.3.0
+// fusv-enable
+
+$list-group-hover-bg:               var(--#{$prefix}tertiary-bg) !default;
 $list-group-active-color:           $component-active-color !default;
 $list-group-active-bg:              $component-active-bg !default;
 $list-group-active-border-color:    $list-group-active-bg !default;
 
-$list-group-disabled-color:         $gray-600 !default;
+$list-group-disabled-color:         var(--#{$prefix}secondary-color) !default;
 $list-group-disabled-bg:            $list-group-bg !default;
 
-$list-group-action-color:           $gray-700 !default;
-$list-group-action-hover-color:     $list-group-action-color !default;
+$list-group-action-color:           var(--#{$prefix}secondary-color) !default;
+$list-group-action-hover-color:     var(--#{$prefix}emphasis-color) !default;
 
-$list-group-action-active-color:    $body-color !default;
-$list-group-action-active-bg:       $gray-200 !default;
+$list-group-action-active-color:    var(--#{$prefix}body-color) !default;
+$list-group-action-active-bg:       var(--#{$prefix}secondary-bg) !default;
+// scss-docs-end list-group-variables
 
 
 // Image thumbnails
 
+// scss-docs-start thumbnail-variables
 $thumbnail-padding:                 .25rem !default;
-$thumbnail-bg:                      $body-bg !default;
-$thumbnail-border-width:            $border-width !default;
-$thumbnail-border-color:            $gray-300 !default;
-$thumbnail-border-radius:           $border-radius !default;
-$thumbnail-box-shadow:              0 1px 2px rgba($black, .075) !default;
+$thumbnail-bg:                      var(--#{$prefix}body-bg) !default;
+$thumbnail-border-width:            var(--#{$prefix}border-width) !default;
+$thumbnail-border-color:            var(--#{$prefix}border-color) !default;
+$thumbnail-border-radius:           var(--#{$prefix}border-radius) !default;
+$thumbnail-box-shadow:              var(--#{$prefix}box-shadow-sm) !default;
+// scss-docs-end thumbnail-variables
 
 
 // Figures
 
-$figure-caption-font-size:          90% !default;
-$figure-caption-color:              $gray-600 !default;
+// scss-docs-start figure-variables
+$figure-caption-font-size:          $small-font-size !default;
+$figure-caption-color:              var(--#{$prefix}secondary-color) !default;
+// scss-docs-end figure-variables
 
 
 // Breadcrumbs
 
+// scss-docs-start breadcrumb-variables
 $breadcrumb-font-size:              null !default;
-
-$breadcrumb-padding-y:              .75rem !default;
-$breadcrumb-padding-x:              1rem !default;
-$breadcrumb-item-padding:           .5rem !default;
-
+$breadcrumb-padding-y:              0 !default;
+$breadcrumb-padding-x:              0 !default;
+$breadcrumb-item-padding-x:         .5rem !default;
 $breadcrumb-margin-bottom:          1rem !default;
-
-$breadcrumb-bg:                     $gray-200 !default;
-$breadcrumb-divider-color:          $gray-600 !default;
-$breadcrumb-active-color:           $gray-600 !default;
+$breadcrumb-bg:                     null !default;
+$breadcrumb-divider-color:          var(--#{$prefix}secondary-color) !default;
+$breadcrumb-active-color:           var(--#{$prefix}secondary-color) !default;
 $breadcrumb-divider:                quote("/") !default;
-
-$breadcrumb-border-radius:          $border-radius !default;
-
+$breadcrumb-divider-flipped:        $breadcrumb-divider !default;
+$breadcrumb-border-radius:          null !default;
+// scss-docs-end breadcrumb-variables
 
 // Carousel
 
+// scss-docs-start carousel-variables
 $carousel-control-color:             $white !default;
 $carousel-control-width:             15% !default;
 $carousel-control-opacity:           .5 !default;
@@ -1083,64 +1655,93 @@ $carousel-indicator-width:           30px !default;
 $carousel-indicator-height:          3px !default;
 $carousel-indicator-hit-area-height: 10px !default;
 $carousel-indicator-spacer:          3px !default;
+$carousel-indicator-opacity:         .5 !default;
 $carousel-indicator-active-bg:       $white !default;
+$carousel-indicator-active-opacity:  1 !default;
 $carousel-indicator-transition:      opacity .6s ease !default;
 
 $carousel-caption-width:             70% !default;
 $carousel-caption-color:             $white !default;
+$carousel-caption-padding-y:         1.25rem !default;
+$carousel-caption-spacer:            1.25rem !default;
 
-$carousel-control-icon-width:        20px !default;
+$carousel-control-icon-width:        2rem !default;
 
-$carousel-control-prev-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' width='8' height='8' viewBox='0 0 8 8'><path d='M5.25 0l-4 4 4 4 1.5-1.5L4.25 4l2.5-2.5L5.25 0z'/></svg>") !default;
-$carousel-control-next-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' width='8' height='8' viewBox='0 0 8 8'><path d='M2.75 0l-1.5 1.5L3.75 4l-2.5 2.5L2.75 8l4-4-4-4z'/></svg>") !default;
+$carousel-control-prev-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$carousel-control-color}'><path d='M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z'/></svg>") !default;
+$carousel-control-next-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$carousel-control-color}'><path d='M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z'/></svg>") !default;
 
 $carousel-transition-duration:       .6s !default;
 $carousel-transition:                transform $carousel-transition-duration ease-in-out !default; // Define transform transition first if using multiple transitions (e.g., `transform 2s ease, opacity .5s ease-out`)
+// scss-docs-end carousel-variables
+
+// scss-docs-start carousel-dark-variables
+$carousel-dark-indicator-active-bg:  $black !default;
+$carousel-dark-caption-color:        $black !default;
+$carousel-dark-control-icon-filter:  invert(1) grayscale(100) !default;
+// scss-docs-end carousel-dark-variables
 
 
 // Spinners
 
-$spinner-width:         2rem !default;
-$spinner-height:        $spinner-width !default;
-$spinner-border-width:  .25em !default;
+// scss-docs-start spinner-variables
+$spinner-width:           2rem !default;
+$spinner-height:          $spinner-width !default;
+$spinner-vertical-align:  -.125em !default;
+$spinner-border-width:    .25em !default;
+$spinner-animation-speed: .75s !default;
 
 $spinner-width-sm:        1rem !default;
 $spinner-height-sm:       $spinner-width-sm !default;
 $spinner-border-width-sm: .2em !default;
+// scss-docs-end spinner-variables
 
 
 // Close
 
-$close-font-size:                   $font-size-base * 1.5 !default;
-$close-font-weight:                 $font-weight-bold !default;
-$close-color:                       $black !default;
-$close-text-shadow:                 0 1px 0 $white !default;
-
+// scss-docs-start close-variables
+$btn-close-width:            1em !default;
+$btn-close-height:           $btn-close-width !default;
+$btn-close-padding-x:        .25em !default;
+$btn-close-padding-y:        $btn-close-padding-x !default;
+$btn-close-color:            $black !default;
+$btn-close-bg:               url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$btn-close-color}'><path d='M.293.293a1 1 0 0 1 1.414 0L8 6.586 14.293.293a1 1 0 1 1 1.414 1.414L9.414 8l6.293 6.293a1 1 0 0 1-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 0 1-1.414-1.414L6.586 8 .293 1.707a1 1 0 0 1 0-1.414z'/></svg>") !default;
+$btn-close-focus-shadow:     $focus-ring-box-shadow !default;
+$btn-close-opacity:          .5 !default;
+$btn-close-hover-opacity:    .75 !default;
+$btn-close-focus-opacity:    1 !default;
+$btn-close-disabled-opacity: .25 !default;
+$btn-close-white-filter:     invert(1) grayscale(100%) brightness(200%) !default;
+// scss-docs-end close-variables
+
+
+// Offcanvas
+
+// scss-docs-start offcanvas-variables
+$offcanvas-padding-y:               $modal-inner-padding !default;
+$offcanvas-padding-x:               $modal-inner-padding !default;
+$offcanvas-horizontal-width:        400px !default;
+$offcanvas-vertical-height:         30vh !default;
+$offcanvas-transition-duration:     .3s !default;
+$offcanvas-border-color:            $modal-content-border-color !default;
+$offcanvas-border-width:            $modal-content-border-width !default;
+$offcanvas-title-line-height:       $modal-title-line-height !default;
+$offcanvas-bg-color:                var(--#{$prefix}body-bg) !default;
+$offcanvas-color:                   var(--#{$prefix}body-color) !default;
+$offcanvas-box-shadow:              $modal-content-box-shadow-xs !default;
+$offcanvas-backdrop-bg:             $modal-backdrop-bg !default;
+$offcanvas-backdrop-opacity:        $modal-backdrop-opacity !default;
+// scss-docs-end offcanvas-variables
 
 // Code
 
-$code-font-size:                    87.5% !default;
+$code-font-size:                    $small-font-size !default;
 $code-color:                        $pink !default;
 
-$kbd-padding-y:                     .2rem !default;
-$kbd-padding-x:                     .4rem !default;
+$kbd-padding-y:                     .1875rem !default;
+$kbd-padding-x:                     .375rem !default;
 $kbd-font-size:                     $code-font-size !default;
-$kbd-color:                         $white !default;
-$kbd-bg:                            $gray-900 !default;
-
-$pre-color:                         $gray-900 !default;
-$pre-scrollable-max-height:         340px !default;
-
-
-// Utilities
-
-$displays: none, inline, inline-block, block, table, table-row, table-cell, flex, inline-flex !default;
-$overflows: auto, hidden !default;
-$positions: static, relative, absolute, fixed, sticky !default;
-$user-selects: all, auto, none !default;
-
-
-// Printing
+$kbd-color:                         var(--#{$prefix}body-bg) !default;
+$kbd-bg:                            var(--#{$prefix}body-color) !default;
+$nested-kbd-font-weight:            null !default; // Deprecated in v5.2.0, removing in v6
 
-$print-page-size:                   a3 !default;
-$print-body-min-width:              map-get($grid-breakpoints, "lg") !default;
+$pre-color:                         null !default;
diff --git a/_sass/bootstrap/bootstrap-grid.scss b/_sass/bootstrap/bootstrap-grid.scss
index 6a66483772..52bd577e3a 100644
--- a/_sass/bootstrap/bootstrap-grid.scss
+++ b/_sass/bootstrap/bootstrap-grid.scss
@@ -1,30 +1,62 @@
-/*!
- * Bootstrap Grid v4.6.0 (https://getbootstrap.com/)
- * Copyright 2011-2021 The Bootstrap Authors
- * Copyright 2011-2021 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
- */
+@import "mixins/banner";
+@include bsBanner(Grid);
 
-html {
-  box-sizing: border-box;
-  -ms-overflow-style: scrollbar;
-}
-
-*,
-*::before,
-*::after {
-  box-sizing: inherit;
-}
+$include-column-box-sizing: true !default;
 
 @import "functions";
 @import "variables";
+@import "variables-dark";
+@import "maps";
 
-@import "mixins/deprecate";
 @import "mixins/breakpoints";
-@import "mixins/grid-framework";
+@import "mixins/container";
 @import "mixins/grid";
+@import "mixins/utilities";
+
+@import "vendor/rfs";
 
+@import "containers";
 @import "grid";
-@import "utilities/display";
-@import "utilities/flex";
-@import "utilities/spacing";
+
+@import "utilities";
+// Only use the utilities we need
+// stylelint-disable-next-line scss/dollar-variable-default
+$utilities: map-get-multiple(
+  $utilities,
+  (
+    "display",
+    "order",
+    "flex",
+    "flex-direction",
+    "flex-grow",
+    "flex-shrink",
+    "flex-wrap",
+    "justify-content",
+    "align-items",
+    "align-content",
+    "align-self",
+    "margin",
+    "margin-x",
+    "margin-y",
+    "margin-top",
+    "margin-end",
+    "margin-bottom",
+    "margin-start",
+    "negative-margin",
+    "negative-margin-x",
+    "negative-margin-y",
+    "negative-margin-top",
+    "negative-margin-end",
+    "negative-margin-bottom",
+    "negative-margin-start",
+    "padding",
+    "padding-x",
+    "padding-y",
+    "padding-top",
+    "padding-end",
+    "padding-bottom",
+    "padding-start",
+  )
+);
+
+@import "utilities/api";
diff --git a/_sass/bootstrap/bootstrap-reboot.scss b/_sass/bootstrap/bootstrap-reboot.scss
index 2b6cfc2f8c..5b69b9552d 100644
--- a/_sass/bootstrap/bootstrap-reboot.scss
+++ b/_sass/bootstrap/bootstrap-reboot.scss
@@ -1,12 +1,10 @@
-/*!
- * Bootstrap Reboot v4.6.0 (https://getbootstrap.com/)
- * Copyright 2011-2021 The Bootstrap Authors
- * Copyright 2011-2021 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
- * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
- */
+@import "mixins/banner";
+@include bsBanner(Reboot);
 
 @import "functions";
 @import "variables";
+@import "variables-dark";
+@import "maps";
 @import "mixins";
+@import "root";
 @import "reboot";
diff --git a/_sass/bootstrap/bootstrap-utilities.scss b/_sass/bootstrap/bootstrap-utilities.scss
new file mode 100644
index 0000000000..99c4a3595c
--- /dev/null
+++ b/_sass/bootstrap/bootstrap-utilities.scss
@@ -0,0 +1,19 @@
+@import "mixins/banner";
+@include bsBanner(Utilities);
+
+// Configuration
+@import "functions";
+@import "variables";
+@import "variables-dark";
+@import "maps";
+@import "mixins";
+@import "utilities";
+
+// Layout & components
+@import "root";
+
+// Helpers
+@import "helpers";
+
+// Utilities
+@import "utilities/api";
diff --git a/_sass/bootstrap/bootstrap.scss b/_sass/bootstrap/bootstrap.scss
index e86c49da54..449d704878 100644
--- a/_sass/bootstrap/bootstrap.scss
+++ b/_sass/bootstrap/bootstrap.scss
@@ -1,18 +1,22 @@
-/*!
- * Bootstrap v4.6.0 (https://getbootstrap.com/)
- * Copyright 2011-2021 The Bootstrap Authors
- * Copyright 2011-2021 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
- */
+@import "mixins/banner";
+@include bsBanner("");
 
+
+// scss-docs-start import-stack
+// Configuration
 @import "functions";
 @import "variables";
+@import "variables-dark";
+@import "maps";
 @import "mixins";
+@import "utilities";
+
+// Layout & components
 @import "root";
 @import "reboot";
 @import "type";
 @import "images";
-@import "code";
+@import "containers";
 @import "grid";
 @import "tables";
 @import "forms";
@@ -20,18 +24,15 @@
 @import "transitions";
 @import "dropdown";
 @import "button-group";
-@import "input-group";
-@import "custom-forms";
 @import "nav";
 @import "navbar";
 @import "card";
+@import "accordion";
 @import "breadcrumb";
 @import "pagination";
 @import "badge";
-@import "jumbotron";
 @import "alert";
 @import "progress";
-@import "media";
 @import "list-group";
 @import "close";
 @import "toasts";
@@ -40,5 +41,12 @@
 @import "popover";
 @import "carousel";
 @import "spinners";
-@import "utilities";
-@import "print";
+@import "offcanvas";
+@import "placeholders";
+
+// Helpers
+@import "helpers";
+
+// Utilities
+@import "utilities/api";
+// scss-docs-end import-stack
diff --git a/_sass/bootstrap/forms/_floating-labels.scss b/_sass/bootstrap/forms/_floating-labels.scss
new file mode 100644
index 0000000000..2cf04704da
--- /dev/null
+++ b/_sass/bootstrap/forms/_floating-labels.scss
@@ -0,0 +1,95 @@
+.form-floating {
+  position: relative;
+
+  > .form-control,
+  > .form-control-plaintext,
+  > .form-select {
+    height: $form-floating-height;
+    min-height: $form-floating-height;
+    line-height: $form-floating-line-height;
+  }
+
+  > label {
+    position: absolute;
+    top: 0;
+    left: 0;
+    z-index: 2;
+    height: 100%; // allow textareas
+    padding: $form-floating-padding-y $form-floating-padding-x;
+    overflow: hidden;
+    text-align: start;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    pointer-events: none;
+    border: $input-border-width solid transparent; // Required for aligning label's text with the input as it affects inner box model
+    transform-origin: 0 0;
+    @include transition($form-floating-transition);
+  }
+
+  > .form-control,
+  > .form-control-plaintext {
+    padding: $form-floating-padding-y $form-floating-padding-x;
+
+    &::placeholder {
+      color: transparent;
+    }
+
+    &:focus,
+    &:not(:placeholder-shown) {
+      padding-top: $form-floating-input-padding-t;
+      padding-bottom: $form-floating-input-padding-b;
+    }
+    // Duplicated because `:-webkit-autofill` invalidates other selectors when grouped
+    &:-webkit-autofill {
+      padding-top: $form-floating-input-padding-t;
+      padding-bottom: $form-floating-input-padding-b;
+    }
+  }
+
+  > .form-select {
+    padding-top: $form-floating-input-padding-t;
+    padding-bottom: $form-floating-input-padding-b;
+  }
+
+  > .form-control:focus,
+  > .form-control:not(:placeholder-shown),
+  > .form-control-plaintext,
+  > .form-select {
+    ~ label {
+      color: rgba(var(--#{$prefix}body-color-rgb), #{$form-floating-label-opacity});
+      transform: $form-floating-label-transform;
+
+      &::after {
+        position: absolute;
+        inset: $form-floating-padding-y ($form-floating-padding-x * .5);
+        z-index: -1;
+        height: $form-floating-label-height;
+        content: "";
+        background-color: $input-bg;
+        @include border-radius($input-border-radius);
+      }
+    }
+  }
+  // Duplicated because `:-webkit-autofill` invalidates other selectors when grouped
+  > .form-control:-webkit-autofill {
+    ~ label {
+      color: rgba(var(--#{$prefix}body-color-rgb), #{$form-floating-label-opacity});
+      transform: $form-floating-label-transform;
+    }
+  }
+
+  > .form-control-plaintext {
+    ~ label {
+      border-width: $input-border-width 0; // Required to properly position label text - as explained above
+    }
+  }
+
+  > :disabled ~ label,
+  > .form-control:disabled ~ label { // Required for `.form-control`s because of specificity
+    color: $form-floating-label-disabled-color;
+
+    &::after {
+      background-color: $input-disabled-bg;
+    }
+  }
+}
diff --git a/_sass/bootstrap/forms/_form-check.scss b/_sass/bootstrap/forms/_form-check.scss
new file mode 100644
index 0000000000..d3a8fe60da
--- /dev/null
+++ b/_sass/bootstrap/forms/_form-check.scss
@@ -0,0 +1,189 @@
+//
+// Check/radio
+//
+
+.form-check {
+  display: block;
+  min-height: $form-check-min-height;
+  padding-left: $form-check-padding-start;
+  margin-bottom: $form-check-margin-bottom;
+
+  .form-check-input {
+    float: left;
+    margin-left: $form-check-padding-start * -1;
+  }
+}
+
+.form-check-reverse {
+  padding-right: $form-check-padding-start;
+  padding-left: 0;
+  text-align: right;
+
+  .form-check-input {
+    float: right;
+    margin-right: $form-check-padding-start * -1;
+    margin-left: 0;
+  }
+}
+
+.form-check-input {
+  --#{$prefix}form-check-bg: #{$form-check-input-bg};
+
+  flex-shrink: 0;
+  width: $form-check-input-width;
+  height: $form-check-input-width;
+  margin-top: ($line-height-base - $form-check-input-width) * .5; // line-height minus check height
+  vertical-align: top;
+  appearance: none;
+  background-color: var(--#{$prefix}form-check-bg);
+  background-image: var(--#{$prefix}form-check-bg-image);
+  background-repeat: no-repeat;
+  background-position: center;
+  background-size: contain;
+  border: $form-check-input-border;
+  print-color-adjust: exact; // Keep themed appearance for print
+  @include transition($form-check-transition);
+
+  &[type="checkbox"] {
+    @include border-radius($form-check-input-border-radius);
+  }
+
+  &[type="radio"] {
+    // stylelint-disable-next-line property-disallowed-list
+    border-radius: $form-check-radio-border-radius;
+  }
+
+  &:active {
+    filter: $form-check-input-active-filter;
+  }
+
+  &:focus {
+    border-color: $form-check-input-focus-border;
+    outline: 0;
+    box-shadow: $form-check-input-focus-box-shadow;
+  }
+
+  &:checked {
+    background-color: $form-check-input-checked-bg-color;
+    border-color: $form-check-input-checked-border-color;
+
+    &[type="checkbox"] {
+      @if $enable-gradients {
+        --#{$prefix}form-check-bg-image: #{escape-svg($form-check-input-checked-bg-image)}, var(--#{$prefix}gradient);
+      } @else {
+        --#{$prefix}form-check-bg-image: #{escape-svg($form-check-input-checked-bg-image)};
+      }
+    }
+
+    &[type="radio"] {
+      @if $enable-gradients {
+        --#{$prefix}form-check-bg-image: #{escape-svg($form-check-radio-checked-bg-image)}, var(--#{$prefix}gradient);
+      } @else {
+        --#{$prefix}form-check-bg-image: #{escape-svg($form-check-radio-checked-bg-image)};
+      }
+    }
+  }
+
+  &[type="checkbox"]:indeterminate {
+    background-color: $form-check-input-indeterminate-bg-color;
+    border-color: $form-check-input-indeterminate-border-color;
+
+    @if $enable-gradients {
+      --#{$prefix}form-check-bg-image: #{escape-svg($form-check-input-indeterminate-bg-image)}, var(--#{$prefix}gradient);
+    } @else {
+      --#{$prefix}form-check-bg-image: #{escape-svg($form-check-input-indeterminate-bg-image)};
+    }
+  }
+
+  &:disabled {
+    pointer-events: none;
+    filter: none;
+    opacity: $form-check-input-disabled-opacity;
+  }
+
+  // Use disabled attribute in addition of :disabled pseudo-class
+  // See: https://github.com/twbs/bootstrap/issues/28247
+  &[disabled],
+  &:disabled {
+    ~ .form-check-label {
+      cursor: default;
+      opacity: $form-check-label-disabled-opacity;
+    }
+  }
+}
+
+.form-check-label {
+  color: $form-check-label-color;
+  cursor: $form-check-label-cursor;
+}
+
+//
+// Switch
+//
+
+.form-switch {
+  padding-left: $form-switch-padding-start;
+
+  .form-check-input {
+    --#{$prefix}form-switch-bg: #{escape-svg($form-switch-bg-image)};
+
+    width: $form-switch-width;
+    margin-left: $form-switch-padding-start * -1;
+    background-image: var(--#{$prefix}form-switch-bg);
+    background-position: left center;
+    @include border-radius($form-switch-border-radius);
+    @include transition($form-switch-transition);
+
+    &:focus {
+      --#{$prefix}form-switch-bg: #{escape-svg($form-switch-focus-bg-image)};
+    }
+
+    &:checked {
+      background-position: $form-switch-checked-bg-position;
+
+      @if $enable-gradients {
+        --#{$prefix}form-switch-bg: #{escape-svg($form-switch-checked-bg-image)}, var(--#{$prefix}gradient);
+      } @else {
+        --#{$prefix}form-switch-bg: #{escape-svg($form-switch-checked-bg-image)};
+      }
+    }
+  }
+
+  &.form-check-reverse {
+    padding-right: $form-switch-padding-start;
+    padding-left: 0;
+
+    .form-check-input {
+      margin-right: $form-switch-padding-start * -1;
+      margin-left: 0;
+    }
+  }
+}
+
+.form-check-inline {
+  display: inline-block;
+  margin-right: $form-check-inline-margin-end;
+}
+
+.btn-check {
+  position: absolute;
+  clip: rect(0, 0, 0, 0);
+  pointer-events: none;
+
+  &[disabled],
+  &:disabled {
+    + .btn {
+      pointer-events: none;
+      filter: none;
+      opacity: $form-check-btn-check-disabled-opacity;
+    }
+  }
+}
+
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .form-switch .form-check-input:not(:checked):not(:focus) {
+      --#{$prefix}form-switch-bg: #{escape-svg($form-switch-bg-image-dark)};
+    }
+  }
+}
diff --git a/_sass/bootstrap/forms/_form-control.scss b/_sass/bootstrap/forms/_form-control.scss
new file mode 100644
index 0000000000..67ae5f4f90
--- /dev/null
+++ b/_sass/bootstrap/forms/_form-control.scss
@@ -0,0 +1,214 @@
+//
+// General form controls (plus a few specific high-level interventions)
+//
+
+.form-control {
+  display: block;
+  width: 100%;
+  padding: $input-padding-y $input-padding-x;
+  font-family: $input-font-family;
+  @include font-size($input-font-size);
+  font-weight: $input-font-weight;
+  line-height: $input-line-height;
+  color: $input-color;
+  appearance: none; // Fix appearance for date inputs in Safari
+  background-color: $input-bg;
+  background-clip: padding-box;
+  border: $input-border-width solid $input-border-color;
+
+  // Note: This has no effect on <select>s in some browsers, due to the limited stylability of `<select>`s in CSS.
+  @include border-radius($input-border-radius, 0);
+
+  @include box-shadow($input-box-shadow);
+  @include transition($input-transition);
+
+  &[type="file"] {
+    overflow: hidden; // prevent pseudo element button overlap
+
+    &:not(:disabled):not([readonly]) {
+      cursor: pointer;
+    }
+  }
+
+  // Customize the `:focus` state to imitate native WebKit styles.
+  &:focus {
+    color: $input-focus-color;
+    background-color: $input-focus-bg;
+    border-color: $input-focus-border-color;
+    outline: 0;
+    @if $enable-shadows {
+      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
+    } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
+      box-shadow: $input-focus-box-shadow;
+    }
+  }
+
+  &::-webkit-date-and-time-value {
+    // On Android Chrome, form-control's "width: 100%" makes the input width too small
+    // Tested under Android 11 / Chrome 89, Android 12 / Chrome 100, Android 13 / Chrome 109
+    //
+    // On iOS Safari, form-control's "appearance: none" + "width: 100%" makes the input width too small
+    // Tested under iOS 16.2 / Safari 16.2
+    min-width: 85px; // Seems to be a good minimum safe width
+
+    // Add some height to date inputs on iOS
+    // https://github.com/twbs/bootstrap/issues/23307
+    // TODO: we can remove this workaround once https://bugs.webkit.org/show_bug.cgi?id=198959 is resolved
+    // Multiply line-height by 1em if it has no unit
+    height: if(unit($input-line-height) == "", $input-line-height * 1em, $input-line-height);
+
+    // Android Chrome type="date" is taller than the other inputs
+    // because of "margin: 1px 24px 1px 4px" inside the shadow DOM
+    // Tested under Android 11 / Chrome 89, Android 12 / Chrome 100, Android 13 / Chrome 109
+    margin: 0;
+  }
+
+  // Prevent excessive date input height in Webkit
+  // https://github.com/twbs/bootstrap/issues/34433
+  &::-webkit-datetime-edit {
+    display: block;
+    padding: 0;
+  }
+
+  // Placeholder
+  &::placeholder {
+    color: $input-placeholder-color;
+    // Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526.
+    opacity: 1;
+  }
+
+  // Disabled inputs
+  //
+  // HTML5 says that controls under a fieldset > legend:first-child won't be
+  // disabled if the fieldset is disabled. Due to implementation difficulty, we
+  // don't honor that edge case; we style them as disabled anyway.
+  &:disabled {
+    color: $input-disabled-color;
+    background-color: $input-disabled-bg;
+    border-color: $input-disabled-border-color;
+    // iOS fix for unreadable disabled content; see https://github.com/twbs/bootstrap/issues/11655.
+    opacity: 1;
+  }
+
+  // File input buttons theming
+  &::file-selector-button {
+    padding: $input-padding-y $input-padding-x;
+    margin: (-$input-padding-y) (-$input-padding-x);
+    margin-inline-end: $input-padding-x;
+    color: $form-file-button-color;
+    @include gradient-bg($form-file-button-bg);
+    pointer-events: none;
+    border-color: inherit;
+    border-style: solid;
+    border-width: 0;
+    border-inline-end-width: $input-border-width;
+    border-radius: 0; // stylelint-disable-line property-disallowed-list
+    @include transition($btn-transition);
+  }
+
+  &:hover:not(:disabled):not([readonly])::file-selector-button {
+    background-color: $form-file-button-hover-bg;
+  }
+}
+
+// Readonly controls as plain text
+//
+// Apply class to a readonly input to make it appear like regular plain
+// text (without any border, background color, focus indicator)
+
+.form-control-plaintext {
+  display: block;
+  width: 100%;
+  padding: $input-padding-y 0;
+  margin-bottom: 0; // match inputs if this class comes on inputs with default margins
+  line-height: $input-line-height;
+  color: $input-plaintext-color;
+  background-color: transparent;
+  border: solid transparent;
+  border-width: $input-border-width 0;
+
+  &:focus {
+    outline: 0;
+  }
+
+  &.form-control-sm,
+  &.form-control-lg {
+    padding-right: 0;
+    padding-left: 0;
+  }
+}
+
+// Form control sizing
+//
+// Build on `.form-control` with modifier classes to decrease or increase the
+// height and font-size of form controls.
+//
+// Repeated in `_input_group.scss` to avoid Sass extend issues.
+
+.form-control-sm {
+  min-height: $input-height-sm;
+  padding: $input-padding-y-sm $input-padding-x-sm;
+  @include font-size($input-font-size-sm);
+  @include border-radius($input-border-radius-sm);
+
+  &::file-selector-button {
+    padding: $input-padding-y-sm $input-padding-x-sm;
+    margin: (-$input-padding-y-sm) (-$input-padding-x-sm);
+    margin-inline-end: $input-padding-x-sm;
+  }
+}
+
+.form-control-lg {
+  min-height: $input-height-lg;
+  padding: $input-padding-y-lg $input-padding-x-lg;
+  @include font-size($input-font-size-lg);
+  @include border-radius($input-border-radius-lg);
+
+  &::file-selector-button {
+    padding: $input-padding-y-lg $input-padding-x-lg;
+    margin: (-$input-padding-y-lg) (-$input-padding-x-lg);
+    margin-inline-end: $input-padding-x-lg;
+  }
+}
+
+// Make sure textareas don't shrink too much when resized
+// https://github.com/twbs/bootstrap/pull/29124
+// stylelint-disable selector-no-qualifying-type
+textarea {
+  &.form-control {
+    min-height: $input-height;
+  }
+
+  &.form-control-sm {
+    min-height: $input-height-sm;
+  }
+
+  &.form-control-lg {
+    min-height: $input-height-lg;
+  }
+}
+// stylelint-enable selector-no-qualifying-type
+
+.form-control-color {
+  width: $form-color-width;
+  height: $input-height;
+  padding: $input-padding-y;
+
+  &:not(:disabled):not([readonly]) {
+    cursor: pointer;
+  }
+
+  &::-moz-color-swatch {
+    border: 0 !important; // stylelint-disable-line declaration-no-important
+    @include border-radius($input-border-radius);
+  }
+
+  &::-webkit-color-swatch {
+    border: 0 !important; // stylelint-disable-line declaration-no-important
+    @include border-radius($input-border-radius);
+  }
+
+  &.form-control-sm { height: $input-height-sm; }
+  &.form-control-lg { height: $input-height-lg; }
+}
diff --git a/_sass/bootstrap/forms/_form-range.scss b/_sass/bootstrap/forms/_form-range.scss
new file mode 100644
index 0000000000..4732213e97
--- /dev/null
+++ b/_sass/bootstrap/forms/_form-range.scss
@@ -0,0 +1,91 @@
+// Range
+//
+// Style range inputs the same across browsers. Vendor-specific rules for pseudo
+// elements cannot be mixed. As such, there are no shared styles for focus or
+// active states on prefixed selectors.
+
+.form-range {
+  width: 100%;
+  height: add($form-range-thumb-height, $form-range-thumb-focus-box-shadow-width * 2);
+  padding: 0; // Need to reset padding
+  appearance: none;
+  background-color: transparent;
+
+  &:focus {
+    outline: 0;
+
+    // Pseudo-elements must be split across multiple rulesets to have an effect.
+    // No box-shadow() mixin for focus accessibility.
+    &::-webkit-slider-thumb { box-shadow: $form-range-thumb-focus-box-shadow; }
+    &::-moz-range-thumb     { box-shadow: $form-range-thumb-focus-box-shadow; }
+  }
+
+  &::-moz-focus-outer {
+    border: 0;
+  }
+
+  &::-webkit-slider-thumb {
+    width: $form-range-thumb-width;
+    height: $form-range-thumb-height;
+    margin-top: ($form-range-track-height - $form-range-thumb-height) * .5; // Webkit specific
+    appearance: none;
+    @include gradient-bg($form-range-thumb-bg);
+    border: $form-range-thumb-border;
+    @include border-radius($form-range-thumb-border-radius);
+    @include box-shadow($form-range-thumb-box-shadow);
+    @include transition($form-range-thumb-transition);
+
+    &:active {
+      @include gradient-bg($form-range-thumb-active-bg);
+    }
+  }
+
+  &::-webkit-slider-runnable-track {
+    width: $form-range-track-width;
+    height: $form-range-track-height;
+    color: transparent; // Why?
+    cursor: $form-range-track-cursor;
+    background-color: $form-range-track-bg;
+    border-color: transparent;
+    @include border-radius($form-range-track-border-radius);
+    @include box-shadow($form-range-track-box-shadow);
+  }
+
+  &::-moz-range-thumb {
+    width: $form-range-thumb-width;
+    height: $form-range-thumb-height;
+    appearance: none;
+    @include gradient-bg($form-range-thumb-bg);
+    border: $form-range-thumb-border;
+    @include border-radius($form-range-thumb-border-radius);
+    @include box-shadow($form-range-thumb-box-shadow);
+    @include transition($form-range-thumb-transition);
+
+    &:active {
+      @include gradient-bg($form-range-thumb-active-bg);
+    }
+  }
+
+  &::-moz-range-track {
+    width: $form-range-track-width;
+    height: $form-range-track-height;
+    color: transparent;
+    cursor: $form-range-track-cursor;
+    background-color: $form-range-track-bg;
+    border-color: transparent; // Firefox specific?
+    @include border-radius($form-range-track-border-radius);
+    @include box-shadow($form-range-track-box-shadow);
+  }
+
+  &:disabled {
+    pointer-events: none;
+
+    &::-webkit-slider-thumb {
+      background-color: $form-range-thumb-disabled-bg;
+    }
+
+    &::-moz-range-thumb {
+      background-color: $form-range-thumb-disabled-bg;
+    }
+  }
+}
diff --git a/_sass/bootstrap/forms/_form-select.scss b/_sass/bootstrap/forms/_form-select.scss
new file mode 100644
index 0000000000..69ace529d7
--- /dev/null
+++ b/_sass/bootstrap/forms/_form-select.scss
@@ -0,0 +1,80 @@
+// Select
+//
+// Replaces the browser default select with a custom one, mostly pulled from
+// https://primer.github.io/.
+
+.form-select {
+  --#{$prefix}form-select-bg-img: #{escape-svg($form-select-indicator)};
+
+  display: block;
+  width: 100%;
+  padding: $form-select-padding-y $form-select-indicator-padding $form-select-padding-y $form-select-padding-x;
+  font-family: $form-select-font-family;
+  @include font-size($form-select-font-size);
+  font-weight: $form-select-font-weight;
+  line-height: $form-select-line-height;
+  color: $form-select-color;
+  appearance: none;
+  background-color: $form-select-bg;
+  background-image: var(--#{$prefix}form-select-bg-img), var(--#{$prefix}form-select-bg-icon, none);
+  background-repeat: no-repeat;
+  background-position: $form-select-bg-position;
+  background-size: $form-select-bg-size;
+  border: $form-select-border-width solid $form-select-border-color;
+  @include border-radius($form-select-border-radius, 0);
+  @include box-shadow($form-select-box-shadow);
+  @include transition($form-select-transition);
+
+  &:focus {
+    border-color: $form-select-focus-border-color;
+    outline: 0;
+    @if $enable-shadows {
+      @include box-shadow($form-select-box-shadow, $form-select-focus-box-shadow);
+    } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
+      box-shadow: $form-select-focus-box-shadow;
+    }
+  }
+
+  &[multiple],
+  &[size]:not([size="1"]) {
+    padding-right: $form-select-padding-x;
+    background-image: none;
+  }
+
+  &:disabled {
+    color: $form-select-disabled-color;
+    background-color: $form-select-disabled-bg;
+    border-color: $form-select-disabled-border-color;
+  }
+
+  // Remove outline from select box in FF
+  &:-moz-focusring {
+    color: transparent;
+    text-shadow: 0 0 0 $form-select-color;
+  }
+}
+
+.form-select-sm {
+  padding-top: $form-select-padding-y-sm;
+  padding-bottom: $form-select-padding-y-sm;
+  padding-left: $form-select-padding-x-sm;
+  @include font-size($form-select-font-size-sm);
+  @include border-radius($form-select-border-radius-sm);
+}
+
+.form-select-lg {
+  padding-top: $form-select-padding-y-lg;
+  padding-bottom: $form-select-padding-y-lg;
+  padding-left: $form-select-padding-x-lg;
+  @include font-size($form-select-font-size-lg);
+  @include border-radius($form-select-border-radius-lg);
+}
+
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .form-select {
+      --#{$prefix}form-select-bg-img: #{escape-svg($form-select-indicator-dark)};
+    }
+  }
+}
diff --git a/_sass/bootstrap/forms/_form-text.scss b/_sass/bootstrap/forms/_form-text.scss
new file mode 100644
index 0000000000..f080d1a234
--- /dev/null
+++ b/_sass/bootstrap/forms/_form-text.scss
@@ -0,0 +1,11 @@
+//
+// Form text
+//
+
+.form-text {
+  margin-top: $form-text-margin-top;
+  @include font-size($form-text-font-size);
+  font-style: $form-text-font-style;
+  font-weight: $form-text-font-weight;
+  color: $form-text-color;
+}
diff --git a/_sass/bootstrap/forms/_input-group.scss b/_sass/bootstrap/forms/_input-group.scss
new file mode 100644
index 0000000000..58e4d409c0
--- /dev/null
+++ b/_sass/bootstrap/forms/_input-group.scss
@@ -0,0 +1,132 @@
+//
+// Base styles
+//
+
+.input-group {
+  position: relative;
+  display: flex;
+  flex-wrap: wrap; // For form validation feedback
+  align-items: stretch;
+  width: 100%;
+
+  > .form-control,
+  > .form-select,
+  > .form-floating {
+    position: relative; // For focus state's z-index
+    flex: 1 1 auto;
+    width: 1%;
+    min-width: 0; // https://stackoverflow.com/questions/36247140/why-dont-flex-items-shrink-past-content-size
+  }
+
+  // Bring the "active" form control to the top of surrounding elements
+  > .form-control:focus,
+  > .form-select:focus,
+  > .form-floating:focus-within {
+    z-index: 5;
+  }
+
+  // Ensure buttons are always above inputs for more visually pleasing borders.
+  // This isn't needed for `.input-group-text` since it shares the same border-color
+  // as our inputs.
+  .btn {
+    position: relative;
+    z-index: 2;
+
+    &:focus {
+      z-index: 5;
+    }
+  }
+}
+
+
+// Textual addons
+//
+// Serves as a catch-all element for any text or radio/checkbox input you wish
+// to prepend or append to an input.
+
+.input-group-text {
+  display: flex;
+  align-items: center;
+  padding: $input-group-addon-padding-y $input-group-addon-padding-x;
+  @include font-size($input-font-size); // Match inputs
+  font-weight: $input-group-addon-font-weight;
+  line-height: $input-line-height;
+  color: $input-group-addon-color;
+  text-align: center;
+  white-space: nowrap;
+  background-color: $input-group-addon-bg;
+  border: $input-border-width solid $input-group-addon-border-color;
+  @include border-radius($input-border-radius);
+}
+
+
+// Sizing
+//
+// Remix the default form control sizing classes into new ones for easier
+// manipulation.
+
+.input-group-lg > .form-control,
+.input-group-lg > .form-select,
+.input-group-lg > .input-group-text,
+.input-group-lg > .btn {
+  padding: $input-padding-y-lg $input-padding-x-lg;
+  @include font-size($input-font-size-lg);
+  @include border-radius($input-border-radius-lg);
+}
+
+.input-group-sm > .form-control,
+.input-group-sm > .form-select,
+.input-group-sm > .input-group-text,
+.input-group-sm > .btn {
+  padding: $input-padding-y-sm $input-padding-x-sm;
+  @include font-size($input-font-size-sm);
+  @include border-radius($input-border-radius-sm);
+}
+
+.input-group-lg > .form-select,
+.input-group-sm > .form-select {
+  padding-right: $form-select-padding-x + $form-select-indicator-padding;
+}
+
+
+// Rounded corners
+//
+// These rulesets must come after the sizing ones to properly override sm and lg
+// border-radius values when extending. They're more specific than we'd like
+// with the `.input-group >` part, but without it, we cannot override the sizing.
+
+// stylelint-disable-next-line no-duplicate-selectors
+.input-group {
+  &:not(.has-validation) {
+    > :not(:last-child):not(.dropdown-toggle):not(.dropdown-menu):not(.form-floating),
+    > .dropdown-toggle:nth-last-child(n + 3),
+    > .form-floating:not(:last-child) > .form-control,
+    > .form-floating:not(:last-child) > .form-select {
+      @include border-end-radius(0);
+    }
+  }
+
+  &.has-validation {
+    > :nth-last-child(n + 3):not(.dropdown-toggle):not(.dropdown-menu):not(.form-floating),
+    > .dropdown-toggle:nth-last-child(n + 4),
+    > .form-floating:nth-last-child(n + 3) > .form-control,
+    > .form-floating:nth-last-child(n + 3) > .form-select {
+      @include border-end-radius(0);
+    }
+  }
+
+  $validation-messages: "";
+  @each $state in map-keys($form-validation-states) {
+    $validation-messages: $validation-messages + ":not(." + unquote($state) + "-tooltip)" + ":not(." + unquote($state) + "-feedback)";
+  }
+
+  > :not(:first-child):not(.dropdown-menu)#{$validation-messages} {
+    margin-left: calc(#{$input-border-width} * -1); // stylelint-disable-line function-disallowed-list
+    @include border-start-radius(0);
+  }
+
+  > .form-floating:not(:first-child) > .form-control,
+  > .form-floating:not(:first-child) > .form-select {
+    @include border-start-radius(0);
+  }
+}
diff --git a/_sass/bootstrap/forms/_labels.scss b/_sass/bootstrap/forms/_labels.scss
new file mode 100644
index 0000000000..39ecafcd2f
--- /dev/null
+++ b/_sass/bootstrap/forms/_labels.scss
@@ -0,0 +1,36 @@
+//
+// Labels
+//
+
+.form-label {
+  margin-bottom: $form-label-margin-bottom;
+  @include font-size($form-label-font-size);
+  font-style: $form-label-font-style;
+  font-weight: $form-label-font-weight;
+  color: $form-label-color;
+}
+
+// For use with horizontal and inline forms, when you need the label (or legend)
+// text to align with the form controls.
+.col-form-label {
+  padding-top: add($input-padding-y, $input-border-width);
+  padding-bottom: add($input-padding-y, $input-border-width);
+  margin-bottom: 0; // Override the `<legend>` default
+  @include font-size(inherit); // Override the `<legend>` default
+  font-style: $form-label-font-style;
+  font-weight: $form-label-font-weight;
+  line-height: $input-line-height;
+  color: $form-label-color;
+}
+
+.col-form-label-lg {
+  padding-top: add($input-padding-y-lg, $input-border-width);
+  padding-bottom: add($input-padding-y-lg, $input-border-width);
+  @include font-size($input-font-size-lg);
+}
+
+.col-form-label-sm {
+  padding-top: add($input-padding-y-sm, $input-border-width);
+  padding-bottom: add($input-padding-y-sm, $input-border-width);
+  @include font-size($input-font-size-sm);
+}
diff --git a/_sass/bootstrap/forms/_validation.scss b/_sass/bootstrap/forms/_validation.scss
new file mode 100644
index 0000000000..c48123a716
--- /dev/null
+++ b/_sass/bootstrap/forms/_validation.scss
@@ -0,0 +1,12 @@
+// Form validation
+//
+// Provide feedback to users when form field values are valid or invalid. Works
+// primarily for client-side validation via scoped `:invalid` and `:valid`
+// pseudo-classes but also includes `.is-invalid` and `.is-valid` classes for
+// server-side validation.
+
+// scss-docs-start form-validation-states-loop
+@each $state, $data in $form-validation-states {
+  @include form-validation-state($state, $data...);
+}
+// scss-docs-end form-validation-states-loop
diff --git a/_sass/bootstrap/utilities/_clearfix.scss b/_sass/bootstrap/helpers/_clearfix.scss
similarity index 100%
rename from _sass/bootstrap/utilities/_clearfix.scss
rename to _sass/bootstrap/helpers/_clearfix.scss
diff --git a/_sass/bootstrap/helpers/_color-bg.scss b/_sass/bootstrap/helpers/_color-bg.scss
new file mode 100644
index 0000000000..1a3a4cffd6
--- /dev/null
+++ b/_sass/bootstrap/helpers/_color-bg.scss
@@ -0,0 +1,7 @@
+// All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
+@each $color, $value in $theme-colors {
+  .text-bg-#{$color} {
+    color: color-contrast($value) if($enable-important-utilities, !important, null);
+    background-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
+  }
+}
diff --git a/_sass/bootstrap/helpers/_colored-links.scss b/_sass/bootstrap/helpers/_colored-links.scss
new file mode 100644
index 0000000000..5f86857800
--- /dev/null
+++ b/_sass/bootstrap/helpers/_colored-links.scss
@@ -0,0 +1,30 @@
+// All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
+@each $color, $value in $theme-colors {
+  .link-#{$color} {
+    color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+    text-decoration-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
+
+    @if $link-shade-percentage != 0 {
+      &:hover,
+      &:focus {
+        $hover-color: if(color-contrast($value) == $color-contrast-light, shade-color($value, $link-shade-percentage), tint-color($value, $link-shade-percentage));
+        color: RGBA(#{to-rgb($hover-color)}, var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+        text-decoration-color: RGBA(to-rgb($hover-color), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
+      }
+    }
+  }
+}
+
+// One-off special link helper as a bridge until v6
+.link-body-emphasis {
+  color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-opacity, 1)) if($enable-important-utilities, !important, null);
+  text-decoration-color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-underline-opacity, 1)) if($enable-important-utilities, !important, null);
+
+  @if $link-shade-percentage != 0 {
+    &:hover,
+    &:focus {
+      color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-opacity, .75)) if($enable-important-utilities, !important, null);
+      text-decoration-color: RGBA(var(--#{$prefix}emphasis-color-rgb), var(--#{$prefix}link-underline-opacity, .75)) if($enable-important-utilities, !important, null);
+    }
+  }
+}
diff --git a/_sass/bootstrap/helpers/_focus-ring.scss b/_sass/bootstrap/helpers/_focus-ring.scss
new file mode 100644
index 0000000000..26508a8d6d
--- /dev/null
+++ b/_sass/bootstrap/helpers/_focus-ring.scss
@@ -0,0 +1,5 @@
+.focus-ring:focus {
+  outline: 0;
+  // By default, there is no `--bs-focus-ring-x`, `--bs-focus-ring-y`, or `--bs-focus-ring-blur`, but we provide CSS variables with fallbacks to initial `0` values
+  box-shadow: var(--#{$prefix}focus-ring-x, 0) var(--#{$prefix}focus-ring-y, 0) var(--#{$prefix}focus-ring-blur, 0) var(--#{$prefix}focus-ring-width) var(--#{$prefix}focus-ring-color);
+}
diff --git a/_sass/bootstrap/helpers/_icon-link.scss b/_sass/bootstrap/helpers/_icon-link.scss
new file mode 100644
index 0000000000..3f8bcb335c
--- /dev/null
+++ b/_sass/bootstrap/helpers/_icon-link.scss
@@ -0,0 +1,25 @@
+.icon-link {
+  display: inline-flex;
+  gap: $icon-link-gap;
+  align-items: center;
+  text-decoration-color: rgba(var(--#{$prefix}link-color-rgb), var(--#{$prefix}link-opacity, .5));
+  text-underline-offset: $icon-link-underline-offset;
+  backface-visibility: hidden;
+
+  > .bi {
+    flex-shrink: 0;
+    width: $icon-link-icon-size;
+    height: $icon-link-icon-size;
+    fill: currentcolor;
+    @include transition($icon-link-icon-transition);
+  }
+}
+
+.icon-link-hover {
+  &:hover,
+  &:focus-visible {
+    > .bi {
+      transform: var(--#{$prefix}icon-link-transform, $icon-link-icon-transform);
+    }
+  }
+}
diff --git a/_sass/bootstrap/helpers/_position.scss b/_sass/bootstrap/helpers/_position.scss
new file mode 100644
index 0000000000..59103d9436
--- /dev/null
+++ b/_sass/bootstrap/helpers/_position.scss
@@ -0,0 +1,36 @@
+// Shorthand
+
+.fixed-top {
+  position: fixed;
+  top: 0;
+  right: 0;
+  left: 0;
+  z-index: $zindex-fixed;
+}
+
+.fixed-bottom {
+  position: fixed;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: $zindex-fixed;
+}
+
+// Responsive sticky top and bottom
+@each $breakpoint in map-keys($grid-breakpoints) {
+  @include media-breakpoint-up($breakpoint) {
+    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+    .sticky#{$infix}-top {
+      position: sticky;
+      top: 0;
+      z-index: $zindex-sticky;
+    }
+
+    .sticky#{$infix}-bottom {
+      position: sticky;
+      bottom: 0;
+      z-index: $zindex-sticky;
+    }
+  }
+}
diff --git a/_sass/bootstrap/helpers/_ratio.scss b/_sass/bootstrap/helpers/_ratio.scss
new file mode 100644
index 0000000000..b6a7654c52
--- /dev/null
+++ b/_sass/bootstrap/helpers/_ratio.scss
@@ -0,0 +1,26 @@
+// Credit: Nicolas Gallagher and SUIT CSS.
+
+.ratio {
+  position: relative;
+  width: 100%;
+
+  &::before {
+    display: block;
+    padding-top: var(--#{$prefix}aspect-ratio);
+    content: "";
+  }
+
+  > * {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+  }
+}
+
+@each $key, $ratio in $aspect-ratios {
+  .ratio-#{$key} {
+    --#{$prefix}aspect-ratio: #{$ratio};
+  }
+}
diff --git a/_sass/bootstrap/helpers/_stacks.scss b/_sass/bootstrap/helpers/_stacks.scss
new file mode 100644
index 0000000000..6cd237ae6d
--- /dev/null
+++ b/_sass/bootstrap/helpers/_stacks.scss
@@ -0,0 +1,15 @@
+// scss-docs-start stacks
+.hstack {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  align-self: stretch;
+}
+
+.vstack {
+  display: flex;
+  flex: 1 1 auto;
+  flex-direction: column;
+  align-self: stretch;
+}
+// scss-docs-end stacks
diff --git a/_sass/bootstrap/helpers/_stretched-link.scss b/_sass/bootstrap/helpers/_stretched-link.scss
new file mode 100644
index 0000000000..71a1c755af
--- /dev/null
+++ b/_sass/bootstrap/helpers/_stretched-link.scss
@@ -0,0 +1,15 @@
+//
+// Stretched link
+//
+
+.stretched-link {
+  &::#{$stretched-link-pseudo-element} {
+    position: absolute;
+    top: 0;
+    right: 0;
+    bottom: 0;
+    left: 0;
+    z-index: $stretched-link-z-index;
+    content: "";
+  }
+}
diff --git a/_sass/bootstrap/helpers/_text-truncation.scss b/_sass/bootstrap/helpers/_text-truncation.scss
new file mode 100644
index 0000000000..6421dac9a8
--- /dev/null
+++ b/_sass/bootstrap/helpers/_text-truncation.scss
@@ -0,0 +1,7 @@
+//
+// Text truncation
+//
+
+.text-truncate {
+  @include text-truncate();
+}
diff --git a/_sass/bootstrap/helpers/_visually-hidden.scss b/_sass/bootstrap/helpers/_visually-hidden.scss
new file mode 100644
index 0000000000..4760ff03d1
--- /dev/null
+++ b/_sass/bootstrap/helpers/_visually-hidden.scss
@@ -0,0 +1,8 @@
+//
+// Visually hidden
+//
+
+.visually-hidden,
+.visually-hidden-focusable:not(:focus):not(:focus-within) {
+  @include visually-hidden();
+}
diff --git a/_sass/bootstrap/helpers/_vr.scss b/_sass/bootstrap/helpers/_vr.scss
new file mode 100644
index 0000000000..b6f9d42cb1
--- /dev/null
+++ b/_sass/bootstrap/helpers/_vr.scss
@@ -0,0 +1,8 @@
+.vr {
+  display: inline-block;
+  align-self: stretch;
+  width: $vr-border-width;
+  min-height: 1em;
+  background-color: currentcolor;
+  opacity: $hr-opacity;
+}
diff --git a/_sass/bootstrap/mixins/_alert.scss b/_sass/bootstrap/mixins/_alert.scss
index db5a7eb454..fb524af1c2 100644
--- a/_sass/bootstrap/mixins/_alert.scss
+++ b/_sass/bootstrap/mixins/_alert.scss
@@ -1,13 +1,18 @@
+@include deprecate("`alert-variant()`", "v5.3.0", "v6.0.0");
+
+// scss-docs-start alert-variant-mixin
 @mixin alert-variant($background, $border, $color) {
-  color: $color;
-  @include gradient-bg($background);
-  border-color: $border;
+  --#{$prefix}alert-color: #{$color};
+  --#{$prefix}alert-bg: #{$background};
+  --#{$prefix}alert-border-color: #{$border};
+  --#{$prefix}alert-link-color: #{shade-color($color, 20%)};
 
-  hr {
-    border-top-color: darken($border, 5%);
+  @if $enable-gradients {
+    background-image: var(--#{$prefix}gradient);
   }
 
   .alert-link {
-    color: darken($color, 10%);
+    color: var(--#{$prefix}alert-link-color);
   }
 }
+// scss-docs-end alert-variant-mixin
diff --git a/_sass/bootstrap/mixins/_backdrop.scss b/_sass/bootstrap/mixins/_backdrop.scss
new file mode 100644
index 0000000000..9705ae9eea
--- /dev/null
+++ b/_sass/bootstrap/mixins/_backdrop.scss
@@ -0,0 +1,14 @@
+// Shared between modals and offcanvases
+@mixin overlay-backdrop($zindex, $backdrop-bg, $backdrop-opacity) {
+  position: fixed;
+  top: 0;
+  left: 0;
+  z-index: $zindex;
+  width: 100vw;
+  height: 100vh;
+  background-color: $backdrop-bg;
+
+  // Fade for backdrop
+  &.fade { opacity: 0; }
+  &.show { opacity: $backdrop-opacity; }
+}
diff --git a/_sass/bootstrap/mixins/_background-variant.scss b/_sass/bootstrap/mixins/_background-variant.scss
deleted file mode 100644
index 80580189ad..0000000000
--- a/_sass/bootstrap/mixins/_background-variant.scss
+++ /dev/null
@@ -1,23 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Contextual backgrounds
-
-@mixin bg-variant($parent, $color, $ignore-warning: false) {
-  #{$parent} {
-    background-color: $color !important;
-  }
-  a#{$parent},
-  button#{$parent} {
-    @include hover-focus() {
-      background-color: darken($color, 10%) !important;
-    }
-  }
-  @include deprecate("The `bg-variant` mixin", "v4.4.0", "v5", $ignore-warning);
-}
-
-@mixin bg-gradient-variant($parent, $color, $ignore-warning: false) {
-  #{$parent} {
-    background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x !important;
-  }
-  @include deprecate("The `bg-gradient-variant` mixin", "v4.5.0", "v5", $ignore-warning);
-}
diff --git a/_sass/bootstrap/mixins/_badge.scss b/_sass/bootstrap/mixins/_badge.scss
deleted file mode 100644
index f1c499141a..0000000000
--- a/_sass/bootstrap/mixins/_badge.scss
+++ /dev/null
@@ -1,17 +0,0 @@
-@mixin badge-variant($bg) {
-  color: color-yiq($bg);
-  background-color: $bg;
-
-  @at-root a#{&} {
-    @include hover-focus() {
-      color: color-yiq($bg);
-      background-color: darken($bg, 10%);
-    }
-
-    &:focus,
-    &.focus {
-      outline: 0;
-      box-shadow: 0 0 0 $badge-focus-width rgba($bg, .5);
-    }
-  }
-}
diff --git a/_sass/bootstrap/mixins/_banner.scss b/_sass/bootstrap/mixins/_banner.scss
new file mode 100644
index 0000000000..ee2c584282
--- /dev/null
+++ b/_sass/bootstrap/mixins/_banner.scss
@@ -0,0 +1,7 @@
+@mixin bsBanner($file) {
+  /*!
+   * Bootstrap #{$file} v5.3.2 (https://getbootstrap.com/)
+   * Copyright 2011-2023 The Bootstrap Authors
+   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+   */
+}
diff --git a/_sass/bootstrap/mixins/_border-radius.scss b/_sass/bootstrap/mixins/_border-radius.scss
index 4fad91d676..616decbce3 100644
--- a/_sass/bootstrap/mixins/_border-radius.scss
+++ b/_sass/bootstrap/mixins/_border-radius.scss
@@ -14,6 +14,7 @@
   @return $return;
 }
 
+// scss-docs-start border-radius-mixins
 @mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
   @if $enable-rounded {
     border-radius: valid-radius($radius);
@@ -23,54 +24,55 @@
   }
 }
 
-@mixin border-top-radius($radius) {
+@mixin border-top-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-top-left-radius: valid-radius($radius);
     border-top-right-radius: valid-radius($radius);
   }
 }
 
-@mixin border-right-radius($radius) {
+@mixin border-end-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-top-right-radius: valid-radius($radius);
     border-bottom-right-radius: valid-radius($radius);
   }
 }
 
-@mixin border-bottom-radius($radius) {
+@mixin border-bottom-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-bottom-right-radius: valid-radius($radius);
     border-bottom-left-radius: valid-radius($radius);
   }
 }
 
-@mixin border-left-radius($radius) {
+@mixin border-start-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-top-left-radius: valid-radius($radius);
     border-bottom-left-radius: valid-radius($radius);
   }
 }
 
-@mixin border-top-left-radius($radius) {
+@mixin border-top-start-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-top-left-radius: valid-radius($radius);
   }
 }
 
-@mixin border-top-right-radius($radius) {
+@mixin border-top-end-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-top-right-radius: valid-radius($radius);
   }
 }
 
-@mixin border-bottom-right-radius($radius) {
+@mixin border-bottom-end-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-bottom-right-radius: valid-radius($radius);
   }
 }
 
-@mixin border-bottom-left-radius($radius) {
+@mixin border-bottom-start-radius($radius: $border-radius) {
   @if $enable-rounded {
     border-bottom-left-radius: valid-radius($radius);
   }
 }
+// scss-docs-end border-radius-mixins
diff --git a/_sass/bootstrap/mixins/_box-shadow.scss b/_sass/bootstrap/mixins/_box-shadow.scss
index 0726d4359a..4172541f3f 100644
--- a/_sass/bootstrap/mixins/_box-shadow.scss
+++ b/_sass/bootstrap/mixins/_box-shadow.scss
@@ -2,17 +2,15 @@
   @if $enable-shadows {
     $result: ();
 
-    @if (length($shadow) == 1) {
-      // We can pass `@include box-shadow(none);`
-      $result: $shadow;
-    } @else {
-      // Filter to avoid invalid properties for example `box-shadow: none, 1px 1px black;`
-      @for $i from 1 through length($shadow) {
-        @if nth($shadow, $i) != "none" {
-          $result: append($result, nth($shadow, $i), "comma");
-        }
+    @each $value in $shadow {
+      @if $value != null {
+        $result: append($result, $value, "comma");
+      }
+      @if $value == none and length($shadow) > 1 {
+        @warn "The keyword 'none' must be used as a single argument.";
       }
     }
+
     @if (length($result) > 0) {
       box-shadow: $result;
     }
diff --git a/_sass/bootstrap/mixins/_breakpoints.scss b/_sass/bootstrap/mixins/_breakpoints.scss
index 23a5de96be..286be893d7 100644
--- a/_sass/bootstrap/mixins/_breakpoints.scss
+++ b/_sass/bootstrap/mixins/_breakpoints.scss
@@ -2,7 +2,7 @@
 //
 // Breakpoints are defined as a map of (name: minimum width), order from small to large:
 //
-//    (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)
+//    (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px)
 //
 // The map defined in the `$grid-breakpoints` global variable is used as the `$breakpoints` argument by default.
 
@@ -10,44 +10,47 @@
 //
 //    >> breakpoint-next(sm)
 //    md
-//    >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
+//    >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
 //    md
-//    >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl))
+//    >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl xxl))
 //    md
 @function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
   $n: index($breakpoint-names, $name);
-  @return if($n != null and $n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
+  @if not $n {
+    @error "breakpoint `#{$name}` not found in `#{$breakpoints}`";
+  }
+  @return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
 }
 
 // Minimum breakpoint width. Null for the smallest (first) breakpoint.
 //
-//    >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
+//    >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
 //    576px
 @function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
   $min: map-get($breakpoints, $name);
   @return if($min != 0, $min, null);
 }
 
-// Maximum breakpoint width. Null for the largest (last) breakpoint.
-// The maximum value is calculated as the minimum of the next one less 0.02px
-// to work around the limitations of `min-` and `max-` prefixes and viewports with fractional widths.
+// Maximum breakpoint width.
+// The maximum value is reduced by 0.02px to work around the limitations of
+// `min-` and `max-` prefixes and viewports with fractional widths.
 // See https://www.w3.org/TR/mediaqueries-4/#mq-min-max
 // Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari.
 // See https://bugs.webkit.org/show_bug.cgi?id=178261
 //
-//    >> breakpoint-max(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
+//    >> breakpoint-max(md, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
 //    767.98px
 @function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
-  $next: breakpoint-next($name, $breakpoints);
-  @return if($next, breakpoint-min($next, $breakpoints) - .02, null);
+  $max: map-get($breakpoints, $name);
+  @return if($max and $max > 0, $max - .02, null);
 }
 
 // Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
 // Useful for making responsive utilities.
 //
-//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
+//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
 //    ""  (Returns a blank string)
-//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
+//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
 //    "-sm"
 @function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
   @return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
@@ -104,8 +107,9 @@
 // No minimum for the smallest breakpoint, and no maximum for the largest one.
 // Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
 @mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
-  $min: breakpoint-min($name, $breakpoints);
-  $max: breakpoint-max($name, $breakpoints);
+  $min:  breakpoint-min($name, $breakpoints);
+  $next: breakpoint-next($name, $breakpoints);
+  $max:  breakpoint-max($next, $breakpoints);
 
   @if $min != null and $max != null {
     @media (min-width: $min) and (max-width: $max) {
@@ -116,7 +120,7 @@
       @content;
     }
   } @else if $min == null {
-    @include media-breakpoint-down($name, $breakpoints) {
+    @include media-breakpoint-down($next, $breakpoints) {
       @content;
     }
   }
diff --git a/_sass/bootstrap/mixins/_buttons.scss b/_sass/bootstrap/mixins/_buttons.scss
index d6235aa27c..cf087fda78 100644
--- a/_sass/bootstrap/mixins/_buttons.scss
+++ b/_sass/bootstrap/mixins/_buttons.scss
@@ -3,108 +3,68 @@
 // Easily pump out default styles, as well as :hover, :focus, :active,
 // and disabled options for all buttons
 
-@mixin button-variant($background, $border, $hover-background: darken($background, 7.5%), $hover-border: darken($border, 10%), $active-background: darken($background, 10%), $active-border: darken($border, 12.5%)) {
-  color: color-yiq($background);
-  @include gradient-bg($background);
-  border-color: $border;
-  @include box-shadow($btn-box-shadow);
-
-  @include hover() {
-    color: color-yiq($hover-background);
-    @include gradient-bg($hover-background);
-    border-color: $hover-border;
-  }
-
-  &:focus,
-  &.focus {
-    color: color-yiq($hover-background);
-    @include gradient-bg($hover-background);
-    border-color: $hover-border;
-    @if $enable-shadows {
-      @include box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
-    } @else {
-      // Avoid using mixin so we can pass custom focus shadow properly
-      box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
-    }
-  }
-
-  // Disabled comes first so active can properly restyle
-  &.disabled,
-  &:disabled {
-    color: color-yiq($background);
-    background-color: $background;
-    border-color: $border;
-    // Remove CSS gradients if they're enabled
-    @if $enable-gradients {
-      background-image: none;
-    }
-  }
-
-  &:not(:disabled):not(.disabled):active,
-  &:not(:disabled):not(.disabled).active,
-  .show > &.dropdown-toggle {
-    color: color-yiq($active-background);
-    background-color: $active-background;
-    @if $enable-gradients {
-      background-image: none; // Remove the gradient for the pressed/active state
-    }
-    border-color: $active-border;
-
-    &:focus {
-      @if $enable-shadows and $btn-active-box-shadow != none {
-        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
-      } @else {
-        // Avoid using mixin so we can pass custom focus shadow properly
-        box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
-      }
-    }
-  }
+// scss-docs-start btn-variant-mixin
+@mixin button-variant(
+  $background,
+  $border,
+  $color: color-contrast($background),
+  $hover-background: if($color == $color-contrast-light, shade-color($background, $btn-hover-bg-shade-amount), tint-color($background, $btn-hover-bg-tint-amount)),
+  $hover-border: if($color == $color-contrast-light, shade-color($border, $btn-hover-border-shade-amount), tint-color($border, $btn-hover-border-tint-amount)),
+  $hover-color: color-contrast($hover-background),
+  $active-background: if($color == $color-contrast-light, shade-color($background, $btn-active-bg-shade-amount), tint-color($background, $btn-active-bg-tint-amount)),
+  $active-border: if($color == $color-contrast-light, shade-color($border, $btn-active-border-shade-amount), tint-color($border, $btn-active-border-tint-amount)),
+  $active-color: color-contrast($active-background),
+  $disabled-background: $background,
+  $disabled-border: $border,
+  $disabled-color: color-contrast($disabled-background)
+) {
+  --#{$prefix}btn-color: #{$color};
+  --#{$prefix}btn-bg: #{$background};
+  --#{$prefix}btn-border-color: #{$border};
+  --#{$prefix}btn-hover-color: #{$hover-color};
+  --#{$prefix}btn-hover-bg: #{$hover-background};
+  --#{$prefix}btn-hover-border-color: #{$hover-border};
+  --#{$prefix}btn-focus-shadow-rgb: #{to-rgb(mix($color, $border, 15%))};
+  --#{$prefix}btn-active-color: #{$active-color};
+  --#{$prefix}btn-active-bg: #{$active-background};
+  --#{$prefix}btn-active-border-color: #{$active-border};
+  --#{$prefix}btn-active-shadow: #{$btn-active-box-shadow};
+  --#{$prefix}btn-disabled-color: #{$disabled-color};
+  --#{$prefix}btn-disabled-bg: #{$disabled-background};
+  --#{$prefix}btn-disabled-border-color: #{$disabled-border};
 }
+// scss-docs-end btn-variant-mixin
 
-@mixin button-outline-variant($color, $color-hover: color-yiq($color), $active-background: $color, $active-border: $color) {
-  color: $color;
-  border-color: $color;
-
-  @include hover() {
-    color: $color-hover;
-    background-color: $active-background;
-    border-color: $active-border;
-  }
-
-  &:focus,
-  &.focus {
-    box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
-  }
-
-  &.disabled,
-  &:disabled {
-    color: $color;
-    background-color: transparent;
-  }
-
-  &:not(:disabled):not(.disabled):active,
-  &:not(:disabled):not(.disabled).active,
-  .show > &.dropdown-toggle {
-    color: color-yiq($active-background);
-    background-color: $active-background;
-    border-color: $active-border;
-
-    &:focus {
-      @if $enable-shadows and $btn-active-box-shadow != none {
-        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5));
-      } @else {
-        // Avoid using mixin so we can pass custom focus shadow properly
-        box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
-      }
-    }
-  }
+// scss-docs-start btn-outline-variant-mixin
+@mixin button-outline-variant(
+  $color,
+  $color-hover: color-contrast($color),
+  $active-background: $color,
+  $active-border: $color,
+  $active-color: color-contrast($active-background)
+) {
+  --#{$prefix}btn-color: #{$color};
+  --#{$prefix}btn-border-color: #{$color};
+  --#{$prefix}btn-hover-color: #{$color-hover};
+  --#{$prefix}btn-hover-bg: #{$active-background};
+  --#{$prefix}btn-hover-border-color: #{$active-border};
+  --#{$prefix}btn-focus-shadow-rgb: #{to-rgb($color)};
+  --#{$prefix}btn-active-color: #{$active-color};
+  --#{$prefix}btn-active-bg: #{$active-background};
+  --#{$prefix}btn-active-border-color: #{$active-border};
+  --#{$prefix}btn-active-shadow: #{$btn-active-box-shadow};
+  --#{$prefix}btn-disabled-color: #{$color};
+  --#{$prefix}btn-disabled-bg: transparent;
+  --#{$prefix}btn-disabled-border-color: #{$color};
+  --#{$prefix}gradient: none;
 }
+// scss-docs-end btn-outline-variant-mixin
 
-// Button sizes
-@mixin button-size($padding-y, $padding-x, $font-size, $line-height, $border-radius) {
-  padding: $padding-y $padding-x;
-  @include font-size($font-size);
-  line-height: $line-height;
-  // Manually declare to provide an override to the browser default
-  @include border-radius($border-radius, 0);
+// scss-docs-start btn-size-mixin
+@mixin button-size($padding-y, $padding-x, $font-size, $border-radius) {
+  --#{$prefix}btn-padding-y: #{$padding-y};
+  --#{$prefix}btn-padding-x: #{$padding-x};
+  @include rfs($font-size, --#{$prefix}btn-font-size);
+  --#{$prefix}btn-border-radius: #{$border-radius};
 }
+// scss-docs-end btn-size-mixin
diff --git a/_sass/bootstrap/mixins/_caret.scss b/_sass/bootstrap/mixins/_caret.scss
index 27466495b2..be731165bd 100644
--- a/_sass/bootstrap/mixins/_caret.scss
+++ b/_sass/bootstrap/mixins/_caret.scss
@@ -1,57 +1,63 @@
-@mixin caret-down() {
-  border-top: $caret-width solid;
-  border-right: $caret-width solid transparent;
+// scss-docs-start caret-mixins
+@mixin caret-down($width: $caret-width) {
+  border-top: $width solid;
+  border-right: $width solid transparent;
   border-bottom: 0;
-  border-left: $caret-width solid transparent;
+  border-left: $width solid transparent;
 }
 
-@mixin caret-up() {
+@mixin caret-up($width: $caret-width) {
   border-top: 0;
-  border-right: $caret-width solid transparent;
-  border-bottom: $caret-width solid;
-  border-left: $caret-width solid transparent;
+  border-right: $width solid transparent;
+  border-bottom: $width solid;
+  border-left: $width solid transparent;
 }
 
-@mixin caret-right() {
-  border-top: $caret-width solid transparent;
+@mixin caret-end($width: $caret-width) {
+  border-top: $width solid transparent;
   border-right: 0;
-  border-bottom: $caret-width solid transparent;
-  border-left: $caret-width solid;
+  border-bottom: $width solid transparent;
+  border-left: $width solid;
 }
 
-@mixin caret-left() {
-  border-top: $caret-width solid transparent;
-  border-right: $caret-width solid;
-  border-bottom: $caret-width solid transparent;
+@mixin caret-start($width: $caret-width) {
+  border-top: $width solid transparent;
+  border-right: $width solid;
+  border-bottom: $width solid transparent;
 }
 
-@mixin caret($direction: down) {
+@mixin caret(
+  $direction: down,
+  $width: $caret-width,
+  $spacing: $caret-spacing,
+  $vertical-align: $caret-vertical-align
+) {
   @if $enable-caret {
     &::after {
       display: inline-block;
-      margin-left: $caret-spacing;
-      vertical-align: $caret-vertical-align;
+      margin-left: $spacing;
+      vertical-align: $vertical-align;
       content: "";
       @if $direction == down {
-        @include caret-down();
+        @include caret-down($width);
       } @else if $direction == up {
-        @include caret-up();
-      } @else if $direction == right {
-        @include caret-right();
+        @include caret-up($width);
+      } @else if $direction == end {
+        @include caret-end($width);
       }
     }
 
-    @if $direction == left {
+    @if $direction == start {
       &::after {
         display: none;
       }
 
       &::before {
         display: inline-block;
-        margin-right: $caret-spacing;
-        vertical-align: $caret-vertical-align;
+        margin-right: $spacing;
+        vertical-align: $vertical-align;
         content: "";
-        @include caret-left();
+        @include caret-start($width);
       }
     }
 
@@ -60,3 +66,4 @@
     }
   }
 }
+// scss-docs-end caret-mixins
diff --git a/_sass/bootstrap/mixins/_clearfix.scss b/_sass/bootstrap/mixins/_clearfix.scss
index 11a977b737..ffc62bb285 100644
--- a/_sass/bootstrap/mixins/_clearfix.scss
+++ b/_sass/bootstrap/mixins/_clearfix.scss
@@ -1,3 +1,4 @@
+// scss-docs-start clearfix
 @mixin clearfix() {
   &::after {
     display: block;
@@ -5,3 +6,4 @@
     content: "";
   }
 }
+// scss-docs-end clearfix
diff --git a/_sass/bootstrap/mixins/_color-mode.scss b/_sass/bootstrap/mixins/_color-mode.scss
new file mode 100644
index 0000000000..03338b0256
--- /dev/null
+++ b/_sass/bootstrap/mixins/_color-mode.scss
@@ -0,0 +1,21 @@
+// scss-docs-start color-mode-mixin
+@mixin color-mode($mode: light, $root: false) {
+  @if $color-mode-type == "media-query" {
+    @if $root == true {
+      @media (prefers-color-scheme: $mode) {
+        :root {
+          @content;
+        }
+      }
+    } @else {
+      @media (prefers-color-scheme: $mode) {
+        @content;
+      }
+    }
+  } @else {
+    [data-bs-theme="#{$mode}"] {
+      @content;
+    }
+  }
+}
+// scss-docs-end color-mode-mixin
diff --git a/_sass/bootstrap/mixins/_color-scheme.scss b/_sass/bootstrap/mixins/_color-scheme.scss
new file mode 100644
index 0000000000..90497aa0a9
--- /dev/null
+++ b/_sass/bootstrap/mixins/_color-scheme.scss
@@ -0,0 +1,7 @@
+// scss-docs-start mixin-color-scheme
+@mixin color-scheme($name) {
+  @media (prefers-color-scheme: #{$name}) {
+    @content;
+  }
+}
+// scss-docs-end mixin-color-scheme
diff --git a/_sass/bootstrap/mixins/_container.scss b/_sass/bootstrap/mixins/_container.scss
new file mode 100644
index 0000000000..b9f33519e2
--- /dev/null
+++ b/_sass/bootstrap/mixins/_container.scss
@@ -0,0 +1,11 @@
+// Container mixins
+
+@mixin make-container($gutter: $container-padding-x) {
+  --#{$prefix}gutter-x: #{$gutter};
+  --#{$prefix}gutter-y: 0;
+  width: 100%;
+  padding-right: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  padding-left: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  margin-right: auto;
+  margin-left: auto;
+}
diff --git a/_sass/bootstrap/mixins/_float.scss b/_sass/bootstrap/mixins/_float.scss
deleted file mode 100644
index 6b376a2580..0000000000
--- a/_sass/bootstrap/mixins/_float.scss
+++ /dev/null
@@ -1,14 +0,0 @@
-// stylelint-disable declaration-no-important
-
-@mixin float-left() {
-  float: left !important;
-  @include deprecate("The `float-left` mixin", "v4.3.0", "v5");
-}
-@mixin float-right() {
-  float: right !important;
-  @include deprecate("The `float-right` mixin", "v4.3.0", "v5");
-}
-@mixin float-none() {
-  float: none !important;
-  @include deprecate("The `float-none` mixin", "v4.3.0", "v5");
-}
diff --git a/_sass/bootstrap/mixins/_forms.scss b/_sass/bootstrap/mixins/_forms.scss
index a32163049c..d47b1e41d6 100644
--- a/_sass/bootstrap/mixins/_forms.scss
+++ b/_sass/bootstrap/mixins/_forms.scss
@@ -1,33 +1,7 @@
-// Form control focus state
-//
-// Generate a customized focus state and for any input with the specified color,
-// which defaults to the `$input-focus-border-color` variable.
-//
-// We highly encourage you to not customize the default value, but instead use
-// this to tweak colors on an as-needed basis. This aesthetic change is based on
-// WebKit's default styles, but applicable to a wider range of browsers. Its
-// usability and accessibility should be taken into account with any change.
-//
-// Example usage: change the default blue border and shadow to white for better
-// contrast against a dark gray background.
-@mixin form-control-focus($ignore-warning: false) {
-  &:focus {
-    color: $input-focus-color;
-    background-color: $input-focus-bg;
-    border-color: $input-focus-border-color;
-    outline: 0;
-    @if $enable-shadows {
-      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
-    } @else {
-      // Avoid using mixin so we can pass custom focus shadow properly
-      box-shadow: $input-focus-box-shadow;
-    }
-  }
-  @include deprecate("The `form-control-focus()` mixin", "v4.4.0", "v5", $ignore-warning);
-}
-
 // This mixin uses an `if()` technique to be compatible with Dart Sass
 // See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details
+
+// scss-docs-start form-validation-mixins
 @mixin form-validation-state-selector($state) {
   @if ($state == "valid" or $state == "invalid") {
     .was-validated #{if(&, "&", "")}:#{$state},
@@ -41,19 +15,27 @@
   }
 }
 
-@mixin form-validation-state($state, $color, $icon) {
+@mixin form-validation-state(
+  $state,
+  $color,
+  $icon,
+  $tooltip-color: color-contrast($color),
+  $tooltip-bg-color: rgba($color, $form-feedback-tooltip-opacity),
+  $focus-box-shadow: 0 0 $input-btn-focus-blur $input-focus-width rgba($color, $input-btn-focus-color-opacity),
+  $border-color: $color
+) {
   .#{$state}-feedback {
     display: none;
     width: 100%;
     margin-top: $form-feedback-margin-top;
     @include font-size($form-feedback-font-size);
+    font-style: $form-feedback-font-style;
     color: $color;
   }
 
   .#{$state}-tooltip {
     position: absolute;
     top: 100%;
-    left: 0;
     z-index: 5;
     display: none;
     max-width: 100%; // Contain to parent when possible
@@ -61,16 +43,9 @@
     margin-top: .1rem;
     @include font-size($form-feedback-tooltip-font-size);
     line-height: $form-feedback-tooltip-line-height;
-    color: color-yiq($color);
-    background-color: rgba($color, $form-feedback-tooltip-opacity);
+    color: $tooltip-color;
+    background-color: $tooltip-bg-color;
     @include border-radius($form-feedback-tooltip-border-radius);
-
-    // See https://github.com/twbs/bootstrap/pull/31557
-    // Align tooltip to form elements
-    .form-row > .col > &,
-    .form-row > [class*="col-"] > & {
-      left: $form-grid-gutter-width / 2;
-    }
   }
 
   @include form-validation-state-selector($state) {
@@ -82,7 +57,7 @@
 
   .form-control {
     @include form-validation-state-selector($state) {
-      border-color: $color;
+      border-color: $border-color;
 
       @if $enable-validation-icons {
         padding-right: $input-height-inner;
@@ -93,8 +68,8 @@
       }
 
       &:focus {
-        border-color: $color;
-        box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
+        border-color: $border-color;
+        box-shadow: $focus-box-shadow;
       }
     }
   }
@@ -109,77 +84,70 @@
     }
   }
 
-  .custom-select {
+  .form-select {
     @include form-validation-state-selector($state) {
-      border-color: $color;
+      border-color: $border-color;
 
       @if $enable-validation-icons {
-        padding-right: $custom-select-feedback-icon-padding-right;
-        background: $custom-select-background, $custom-select-bg escape-svg($icon) $custom-select-feedback-icon-position / $custom-select-feedback-icon-size no-repeat;
+        &:not([multiple]):not([size]),
+        &:not([multiple])[size="1"] {
+          --#{$prefix}form-select-bg-icon: #{escape-svg($icon)};
+          padding-right: $form-select-feedback-icon-padding-end;
+          background-position: $form-select-bg-position, $form-select-feedback-icon-position;
+          background-size: $form-select-bg-size, $form-select-feedback-icon-size;
+        }
       }
 
       &:focus {
-        border-color: $color;
-        box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
+        border-color: $border-color;
+        box-shadow: $focus-box-shadow;
       }
     }
   }
 
-  .form-check-input {
+  .form-control-color {
     @include form-validation-state-selector($state) {
-      ~ .form-check-label {
-        color: $color;
-      }
-
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
+      @if $enable-validation-icons {
+        width: add($form-color-width, $input-height-inner);
       }
     }
   }
 
-  .custom-control-input {
+  .form-check-input {
     @include form-validation-state-selector($state) {
-      ~ .custom-control-label {
-        color: $color;
-
-        &::before {
-          border-color: $color;
-        }
-      }
+      border-color: $border-color;
 
       &:checked {
-        ~ .custom-control-label::before {
-          border-color: lighten($color, 10%);
-          @include gradient-bg(lighten($color, 10%));
-        }
+        background-color: $color;
       }
 
       &:focus {
-        ~ .custom-control-label::before {
-          box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
-        }
+        box-shadow: $focus-box-shadow;
+      }
 
-        &:not(:checked) ~ .custom-control-label::before {
-          border-color: $color;
-        }
+      ~ .form-check-label {
+        color: $color;
       }
     }
   }
+  .form-check-inline .form-check-input {
+    ~ .#{$state}-feedback {
+      margin-left: .5em;
+    }
+  }
 
-  // custom file
-  .custom-file-input {
-    @include form-validation-state-selector($state) {
-      ~ .custom-file-label {
-        border-color: $color;
-      }
-
-      &:focus {
-        ~ .custom-file-label {
-          border-color: $color;
-          box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
+  .input-group {
+    > .form-control:not(:focus),
+    > .form-select:not(:focus),
+    > .form-floating:not(:focus-within) {
+      @include form-validation-state-selector($state) {
+        @if $state == "valid" {
+          z-index: 3;
+        } @else if $state == "invalid" {
+          z-index: 4;
         }
       }
     }
   }
 }
+// scss-docs-end form-validation-mixins
diff --git a/_sass/bootstrap/mixins/_gradients.scss b/_sass/bootstrap/mixins/_gradients.scss
index 88c4d64b7f..608e18df2e 100644
--- a/_sass/bootstrap/mixins/_gradients.scss
+++ b/_sass/bootstrap/mixins/_gradients.scss
@@ -1,45 +1,47 @@
 // Gradients
 
-@mixin gradient-bg($color) {
+// scss-docs-start gradient-bg-mixin
+@mixin gradient-bg($color: null) {
+  background-color: $color;
+
   @if $enable-gradients {
-    background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x;
-  } @else {
-    background-color: $color;
+    background-image: var(--#{$prefix}gradient);
   }
 }
+// scss-docs-end gradient-bg-mixin
 
+// scss-docs-start gradient-mixins
 // Horizontal gradient, from left to right
 //
 // Creates two color stops, start and end, by specifying a color and position for each color stop.
 @mixin gradient-x($start-color: $gray-700, $end-color: $gray-800, $start-percent: 0%, $end-percent: 100%) {
   background-image: linear-gradient(to right, $start-color $start-percent, $end-color $end-percent);
-  background-repeat: repeat-x;
 }
 
 // Vertical gradient, from top to bottom
 //
 // Creates two color stops, start and end, by specifying a color and position for each color stop.
-@mixin gradient-y($start-color: $gray-700, $end-color: $gray-800, $start-percent: 0%, $end-percent: 100%) {
+@mixin gradient-y($start-color: $gray-700, $end-color: $gray-800, $start-percent: null, $end-percent: null) {
   background-image: linear-gradient(to bottom, $start-color $start-percent, $end-color $end-percent);
-  background-repeat: repeat-x;
 }
 
 @mixin gradient-directional($start-color: $gray-700, $end-color: $gray-800, $deg: 45deg) {
   background-image: linear-gradient($deg, $start-color, $end-color);
-  background-repeat: repeat-x;
 }
+
 @mixin gradient-x-three-colors($start-color: $blue, $mid-color: $purple, $color-stop: 50%, $end-color: $red) {
   background-image: linear-gradient(to right, $start-color, $mid-color $color-stop, $end-color);
-  background-repeat: no-repeat;
 }
+
 @mixin gradient-y-three-colors($start-color: $blue, $mid-color: $purple, $color-stop: 50%, $end-color: $red) {
   background-image: linear-gradient($start-color, $mid-color $color-stop, $end-color);
-  background-repeat: no-repeat;
 }
+
 @mixin gradient-radial($inner-color: $gray-700, $outer-color: $gray-800) {
   background-image: radial-gradient(circle, $inner-color, $outer-color);
-  background-repeat: no-repeat;
 }
+
 @mixin gradient-striped($color: rgba($white, .15), $angle: 45deg) {
   background-image: linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
 }
+// scss-docs-end gradient-mixins
diff --git a/_sass/bootstrap/mixins/_grid-framework.scss b/_sass/bootstrap/mixins/_grid-framework.scss
deleted file mode 100644
index a4b9765b08..0000000000
--- a/_sass/bootstrap/mixins/_grid-framework.scss
+++ /dev/null
@@ -1,80 +0,0 @@
-// Framework grid generation
-//
-// Used only by Bootstrap to generate the correct number of grid classes given
-// any value of `$grid-columns`.
-
-@mixin make-grid-columns($columns: $grid-columns, $gutter: $grid-gutter-width, $breakpoints: $grid-breakpoints) {
-  // Common properties for all breakpoints
-  %grid-column {
-    position: relative;
-    width: 100%;
-    padding-right: $gutter * 0.5;
-    padding-left: $gutter * 0.5;
-  }
-
-  @each $breakpoint in map-keys($breakpoints) {
-    $infix: breakpoint-infix($breakpoint, $breakpoints);
-
-    @if $columns > 0 {
-      // Allow columns to stretch full width below their breakpoints
-      @for $i from 1 through $columns {
-        .col#{$infix}-#{$i} {
-          @extend %grid-column;
-        }
-      }
-    }
-
-    .col#{$infix},
-    .col#{$infix}-auto {
-      @extend %grid-column;
-    }
-
-    @include media-breakpoint-up($breakpoint, $breakpoints) {
-      // Provide basic `.col-{bp}` classes for equal-width flexbox columns
-      .col#{$infix} {
-        flex-basis: 0;
-        flex-grow: 1;
-        max-width: 100%;
-      }
-
-      @if $grid-row-columns > 0 {
-        @for $i from 1 through $grid-row-columns {
-          .row-cols#{$infix}-#{$i} {
-            @include row-cols($i);
-          }
-        }
-      }
-
-      .col#{$infix}-auto {
-        @include make-col-auto();
-      }
-
-      @if $columns > 0 {
-        @for $i from 1 through $columns {
-          .col#{$infix}-#{$i} {
-            @include make-col($i, $columns);
-          }
-        }
-      }
-
-      .order#{$infix}-first { order: -1; }
-
-      .order#{$infix}-last { order: $columns + 1; }
-
-      @for $i from 0 through $columns {
-        .order#{$infix}-#{$i} { order: $i; }
-      }
-
-      @if $columns > 0 {
-        // `$columns - 1` because offsetting by the width of an entire row isn't possible
-        @for $i from 0 through ($columns - 1) {
-          @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
-            .offset#{$infix}-#{$i} {
-              @include make-col-offset($i, $columns);
-            }
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/_sass/bootstrap/mixins/_grid.scss b/_sass/bootstrap/mixins/_grid.scss
index 0c5ca80753..99b1e7dea6 100644
--- a/_sass/bootstrap/mixins/_grid.scss
+++ b/_sass/bootstrap/mixins/_grid.scss
@@ -1,71 +1,151 @@
-/// Grid system
+// Grid system
 //
 // Generate semantic grid columns with these mixins.
 
-@use "sass:math";
-
-@mixin make-container($gutter: $grid-gutter-width) {
-  width: 100%;
-  padding-right: $gutter * 0.5;
-  padding-left: $gutter * 0.5;
-  margin-right: auto;
-  margin-left: auto;
-}
-
 @mixin make-row($gutter: $grid-gutter-width) {
+  --#{$prefix}gutter-x: #{$gutter};
+  --#{$prefix}gutter-y: 0;
   display: flex;
   flex-wrap: wrap;
-  margin-right: -$gutter * 0.5;
-  margin-left: -$gutter * 0.5;
-}
-
-// For each breakpoint, define the maximum width of the container in a media query
-@mixin make-container-max-widths($max-widths: $container-max-widths, $breakpoints: $grid-breakpoints) {
-  @each $breakpoint, $container-max-width in $max-widths {
-    @include media-breakpoint-up($breakpoint, $breakpoints) {
-      max-width: $container-max-width;
-    }
-  }
-  @include deprecate("The `make-container-max-widths` mixin", "v4.5.2", "v5");
+  // TODO: Revisit calc order after https://github.com/react-bootstrap/react-bootstrap/issues/6039 is fixed
+  margin-top: calc(-1 * var(--#{$prefix}gutter-y)); // stylelint-disable-line function-disallowed-list
+  margin-right: calc(-.5 * var(--#{$prefix}gutter-x)); // stylelint-disable-line function-disallowed-list
+  margin-left: calc(-.5 * var(--#{$prefix}gutter-x)); // stylelint-disable-line function-disallowed-list
 }
 
-@mixin make-col-ready($gutter: $grid-gutter-width) {
-  position: relative;
+@mixin make-col-ready() {
+  // Add box sizing if only the grid is loaded
+  box-sizing: if(variable-exists(include-column-box-sizing) and $include-column-box-sizing, border-box, null);
   // Prevent columns from becoming too narrow when at smaller grid tiers by
-  // always setting `width: 100%;`. This works because we use `flex` values
+  // always setting `width: 100%;`. This works because we set the width
   // later on to override this initial width.
+  flex-shrink: 0;
   width: 100%;
-  padding-right: $gutter * 0.5;
-  padding-left: $gutter * 0.5;
+  max-width: 100%; // Prevent `.col-auto`, `.col` (& responsive variants) from breaking out the grid
+  padding-right: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  padding-left: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  margin-top: var(--#{$prefix}gutter-y);
 }
 
-@mixin make-col($size, $columns: $grid-columns) {
-  flex: 0 0 percentage(math.div($size, $columns));
-  // Add a `max-width` to ensure content within each column does not blow out
-  // the width of the column. Applies to IE10+ and Firefox. Chrome and Safari
-  // do not appear to require this.
-  max-width: percentage(math.div($size, $columns));
+@mixin make-col($size: false, $columns: $grid-columns) {
+  @if $size {
+    flex: 0 0 auto;
+    width: percentage(divide($size, $columns));
+
+  } @else {
+    flex: 1 1 0;
+    max-width: 100%;
+  }
 }
 
 @mixin make-col-auto() {
   flex: 0 0 auto;
   width: auto;
-  max-width: 100%; // Reset earlier grid tiers
 }
 
 @mixin make-col-offset($size, $columns: $grid-columns) {
-  $num: math.div($size, $columns);
+  $num: divide($size, $columns);
   margin-left: if($num == 0, 0, percentage($num));
 }
 
 // Row columns
 //
 // Specify on a parent element(e.g., .row) to force immediate children into NN
-// numberof columns. Supports wrapping to new lines, but does not do a Masonry
+// number of columns. Supports wrapping to new lines, but does not do a Masonry
 // style grid.
 @mixin row-cols($count) {
   > * {
-    flex: 0 0 math.div(100%, $count);
-    max-width: math.div(100%, $count);
+    flex: 0 0 auto;
+    width: percentage(divide(1, $count));
+  }
+}
+
+// Framework grid generation
+//
+// Used only by Bootstrap to generate the correct number of grid classes given
+// any value of `$grid-columns`.
+
+@mixin make-grid-columns($columns: $grid-columns, $gutter: $grid-gutter-width, $breakpoints: $grid-breakpoints) {
+  @each $breakpoint in map-keys($breakpoints) {
+    $infix: breakpoint-infix($breakpoint, $breakpoints);
+
+    @include media-breakpoint-up($breakpoint, $breakpoints) {
+      // Provide basic `.col-{bp}` classes for equal-width flexbox columns
+      .col#{$infix} {
+        flex: 1 0 0%; // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
+      }
+
+      .row-cols#{$infix}-auto > * {
+        @include make-col-auto();
+      }
+
+      @if $grid-row-columns > 0 {
+        @for $i from 1 through $grid-row-columns {
+          .row-cols#{$infix}-#{$i} {
+            @include row-cols($i);
+          }
+        }
+      }
+
+      .col#{$infix}-auto {
+        @include make-col-auto();
+      }
+
+      @if $columns > 0 {
+        @for $i from 1 through $columns {
+          .col#{$infix}-#{$i} {
+            @include make-col($i, $columns);
+          }
+        }
+
+        // `$columns - 1` because offsetting by the width of an entire row isn't possible
+        @for $i from 0 through ($columns - 1) {
+          @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
+            .offset#{$infix}-#{$i} {
+              @include make-col-offset($i, $columns);
+            }
+          }
+        }
+      }
+
+      // Gutters
+      //
+      // Make use of `.g-*`, `.gx-*` or `.gy-*` utilities to change spacing between the columns.
+      @each $key, $value in $gutters {
+        .g#{$infix}-#{$key},
+        .gx#{$infix}-#{$key} {
+          --#{$prefix}gutter-x: #{$value};
+        }
+
+        .g#{$infix}-#{$key},
+        .gy#{$infix}-#{$key} {
+          --#{$prefix}gutter-y: #{$value};
+        }
+      }
+    }
+  }
+}
+
+@mixin make-cssgrid($columns: $grid-columns, $breakpoints: $grid-breakpoints) {
+  @each $breakpoint in map-keys($breakpoints) {
+    $infix: breakpoint-infix($breakpoint, $breakpoints);
+
+    @include media-breakpoint-up($breakpoint, $breakpoints) {
+      @if $columns > 0 {
+        @for $i from 1 through $columns {
+          .g-col#{$infix}-#{$i} {
+            grid-column: auto / span $i;
+          }
+        }
+
+        // Start with `1` because `0` is and invalid value.
+        // Ends with `$columns - 1` because offsetting by the width of an entire row isn't possible.
+        @for $i from 1 through ($columns - 1) {
+          .g-start#{$infix}-#{$i} {
+            grid-column-start: $i;
+          }
+        }
+      }
+    }
   }
 }
diff --git a/_sass/bootstrap/mixins/_hover.scss b/_sass/bootstrap/mixins/_hover.scss
deleted file mode 100644
index 409f8244e1..0000000000
--- a/_sass/bootstrap/mixins/_hover.scss
+++ /dev/null
@@ -1,37 +0,0 @@
-// Hover mixin and `$enable-hover-media-query` are deprecated.
-//
-// Originally added during our alphas and maintained during betas, this mixin was
-// designed to prevent `:hover` stickiness on iOS-an issue where hover styles
-// would persist after initial touch.
-//
-// For backward compatibility, we've kept these mixins and updated them to
-// always return their regular pseudo-classes instead of a shimmed media query.
-//
-// Issue: https://github.com/twbs/bootstrap/issues/25195
-
-@mixin hover() {
-  &:hover { @content; }
-}
-
-@mixin hover-focus() {
-  &:hover,
-  &:focus {
-    @content;
-  }
-}
-
-@mixin plain-hover-focus() {
-  &,
-  &:hover,
-  &:focus {
-    @content;
-  }
-}
-
-@mixin hover-focus-active() {
-  &:hover,
-  &:focus,
-  &:active {
-    @content;
-  }
-}
diff --git a/_sass/bootstrap/mixins/_image.scss b/_sass/bootstrap/mixins/_image.scss
index 3aaa0d7046..e1df779f84 100644
--- a/_sass/bootstrap/mixins/_image.scss
+++ b/_sass/bootstrap/mixins/_image.scss
@@ -7,30 +7,10 @@
 //
 // Keep images from scaling beyond the width of their parents.
 
-@mixin img-fluid() {
+@mixin img-fluid {
   // Part 1: Set a maximum relative to the parent
   max-width: 100%;
   // Part 2: Override the height to auto, otherwise images will be stretched
   // when setting a width and height attribute on the img element.
   height: auto;
 }
-
-
-// Retina image
-//
-// Short retina mixin for setting background-image and -size.
-
-@mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
-  background-image: url($file-1x);
-
-  // Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
-  // but doesn't convert dppx=>dpi.
-  // There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
-  // Compatibility info: https://caniuse.com/css-media-resolution
-  @media only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
-    only screen and (min-resolution: 2dppx) { // Standardized
-    background-image: url($file-2x);
-    background-size: $width-1x $height-1x;
-  }
-  @include deprecate("`img-retina()`", "v4.3.0", "v5");
-}
diff --git a/_sass/bootstrap/mixins/_list-group.scss b/_sass/bootstrap/mixins/_list-group.scss
index 0da3531561..6274f34319 100644
--- a/_sass/bootstrap/mixins/_list-group.scss
+++ b/_sass/bootstrap/mixins/_list-group.scss
@@ -1,14 +1,18 @@
+@include deprecate("`list-group-item-variant()`", "v5.3.0", "v6.0.0");
+
 // List Groups
 
+// scss-docs-start list-group-mixin
 @mixin list-group-item-variant($state, $background, $color) {
   .list-group-item-#{$state} {
     color: $color;
     background-color: $background;
 
     &.list-group-item-action {
-      @include hover-focus() {
+      &:hover,
+      &:focus {
         color: $color;
-        background-color: darken($background, 5%);
+        background-color: shade-color($background, 10%);
       }
 
       &.active {
@@ -19,3 +23,4 @@
     }
   }
 }
+// scss-docs-end list-group-mixin
diff --git a/_sass/bootstrap/mixins/_lists.scss b/_sass/bootstrap/mixins/_lists.scss
index 251cb07331..2518562669 100644
--- a/_sass/bootstrap/mixins/_lists.scss
+++ b/_sass/bootstrap/mixins/_lists.scss
@@ -1,7 +1,7 @@
 // Lists
 
 // Unstyled keeps list items block level, just removes default browser padding and list-style
-@mixin list-unstyled() {
+@mixin list-unstyled {
   padding-left: 0;
   list-style: none;
 }
diff --git a/_sass/bootstrap/mixins/_nav-divider.scss b/_sass/bootstrap/mixins/_nav-divider.scss
deleted file mode 100644
index 3e0cceafef..0000000000
--- a/_sass/bootstrap/mixins/_nav-divider.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-// Horizontal dividers
-//
-// Dividers (basically an hr) within dropdowns and nav lists
-
-@mixin nav-divider($color: $nav-divider-color, $margin-y: $nav-divider-margin-y, $ignore-warning: false) {
-  height: 0;
-  margin: $margin-y 0;
-  overflow: hidden;
-  border-top: 1px solid $color;
-  @include deprecate("The `nav-divider()` mixin", "v4.4.0", "v5", $ignore-warning);
-}
diff --git a/_sass/bootstrap/mixins/_pagination.scss b/_sass/bootstrap/mixins/_pagination.scss
index af8e16d6a9..0d657964fb 100644
--- a/_sass/bootstrap/mixins/_pagination.scss
+++ b/_sass/bootstrap/mixins/_pagination.scss
@@ -1,22 +1,10 @@
 // Pagination
 
-@mixin pagination-size($padding-y, $padding-x, $font-size, $line-height, $border-radius) {
-  .page-link {
-    padding: $padding-y $padding-x;
-    @include font-size($font-size);
-    line-height: $line-height;
-  }
-
-  .page-item {
-    &:first-child {
-      .page-link {
-        @include border-left-radius($border-radius);
-      }
-    }
-    &:last-child {
-      .page-link {
-        @include border-right-radius($border-radius);
-      }
-    }
-  }
+// scss-docs-start pagination-mixin
+@mixin pagination-size($padding-y, $padding-x, $font-size, $border-radius) {
+  --#{$prefix}pagination-padding-x: #{$padding-x};
+  --#{$prefix}pagination-padding-y: #{$padding-y};
+  @include rfs($font-size, --#{$prefix}pagination-font-size);
+  --#{$prefix}pagination-border-radius: #{$border-radius};
 }
+// scss-docs-end pagination-mixin
diff --git a/_sass/bootstrap/mixins/_reset-text.scss b/_sass/bootstrap/mixins/_reset-text.scss
index 15b4407a0a..f5bd1afec2 100644
--- a/_sass/bootstrap/mixins/_reset-text.scss
+++ b/_sass/bootstrap/mixins/_reset-text.scss
@@ -1,6 +1,6 @@
-@mixin reset-text() {
+@mixin reset-text {
   font-family: $font-family-base;
-  // We deliberately do NOT reset font-size or word-wrap.
+  // We deliberately do NOT reset font-size or overflow-wrap / word-wrap.
   font-style: normal;
   font-weight: $font-weight-normal;
   line-height: $line-height-base;
@@ -11,7 +11,7 @@
   text-transform: none;
   letter-spacing: normal;
   word-break: normal;
-  word-spacing: normal;
   white-space: normal;
+  word-spacing: normal;
   line-break: auto;
 }
diff --git a/_sass/bootstrap/mixins/_screen-reader.scss b/_sass/bootstrap/mixins/_screen-reader.scss
deleted file mode 100644
index 6913442b83..0000000000
--- a/_sass/bootstrap/mixins/_screen-reader.scss
+++ /dev/null
@@ -1,34 +0,0 @@
-// Only display content to screen readers
-//
-// See: https://www.a11yproject.com/posts/2013-01-11-how-to-hide-content/
-// See: https://hugogiraudel.com/2016/10/13/css-hide-and-seek/
-
-@mixin sr-only() {
-  position: absolute;
-  width: 1px;
-  height: 1px;
-  padding: 0;
-  margin: -1px; // Fix for https://github.com/twbs/bootstrap/issues/25686
-  overflow: hidden;
-  clip: rect(0, 0, 0, 0);
-  white-space: nowrap;
-  border: 0;
-}
-
-// Use in conjunction with .sr-only to only display content when it's focused.
-//
-// Useful for "Skip to main content" links; see https://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
-//
-// Credit: HTML5 Boilerplate
-
-@mixin sr-only-focusable() {
-  &:active,
-  &:focus {
-    position: static;
-    width: auto;
-    height: auto;
-    overflow: visible;
-    clip: auto;
-    white-space: normal;
-  }
-}
diff --git a/_sass/bootstrap/mixins/_size.scss b/_sass/bootstrap/mixins/_size.scss
deleted file mode 100644
index 69e056d2c1..0000000000
--- a/_sass/bootstrap/mixins/_size.scss
+++ /dev/null
@@ -1,7 +0,0 @@
-// Sizing shortcuts
-
-@mixin size($width, $height: $width) {
-  width: $width;
-  height: $height;
-  @include deprecate("`size()`", "v4.3.0", "v5");
-}
diff --git a/_sass/bootstrap/mixins/_table-row.scss b/_sass/bootstrap/mixins/_table-row.scss
deleted file mode 100644
index 1ccde6b6c5..0000000000
--- a/_sass/bootstrap/mixins/_table-row.scss
+++ /dev/null
@@ -1,39 +0,0 @@
-// Tables
-
-@mixin table-row-variant($state, $background, $border: null) {
-  // Exact selectors below required to override `.table-striped` and prevent
-  // inheritance to nested tables.
-  .table-#{$state} {
-    &,
-    > th,
-    > td {
-      background-color: $background;
-    }
-
-    @if $border != null {
-      th,
-      td,
-      thead th,
-      tbody + tbody {
-        border-color: $border;
-      }
-    }
-  }
-
-  // Hover states for `.table-hover`
-  // Note: this is not available for cells or rows within `thead` or `tfoot`.
-  .table-hover {
-    $hover-background: darken($background, 5%);
-
-    .table-#{$state} {
-      @include hover() {
-        background-color: $hover-background;
-
-        > td,
-        > th {
-          background-color: $hover-background;
-        }
-      }
-    }
-  }
-}
diff --git a/_sass/bootstrap/mixins/_table-variants.scss b/_sass/bootstrap/mixins/_table-variants.scss
new file mode 100644
index 0000000000..5fe1b9b20d
--- /dev/null
+++ b/_sass/bootstrap/mixins/_table-variants.scss
@@ -0,0 +1,24 @@
+// scss-docs-start table-variant
+@mixin table-variant($state, $background) {
+  .table-#{$state} {
+    $color: color-contrast(opaque($body-bg, $background));
+    $hover-bg: mix($color, $background, percentage($table-hover-bg-factor));
+    $striped-bg: mix($color, $background, percentage($table-striped-bg-factor));
+    $active-bg: mix($color, $background, percentage($table-active-bg-factor));
+    $table-border-color: mix($color, $background, percentage($table-border-factor));
+
+    --#{$prefix}table-color: #{$color};
+    --#{$prefix}table-bg: #{$background};
+    --#{$prefix}table-border-color: #{$table-border-color};
+    --#{$prefix}table-striped-bg: #{$striped-bg};
+    --#{$prefix}table-striped-color: #{color-contrast($striped-bg)};
+    --#{$prefix}table-active-bg: #{$active-bg};
+    --#{$prefix}table-active-color: #{color-contrast($active-bg)};
+    --#{$prefix}table-hover-bg: #{$hover-bg};
+    --#{$prefix}table-hover-color: #{color-contrast($hover-bg)};
+
+    color: var(--#{$prefix}table-color);
+    border-color: var(--#{$prefix}table-border-color);
+  }
+}
+// scss-docs-end table-variant
diff --git a/_sass/bootstrap/mixins/_text-emphasis.scss b/_sass/bootstrap/mixins/_text-emphasis.scss
deleted file mode 100644
index 5eb8a55154..0000000000
--- a/_sass/bootstrap/mixins/_text-emphasis.scss
+++ /dev/null
@@ -1,17 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Typography
-
-@mixin text-emphasis-variant($parent, $color, $ignore-warning: false) {
-  #{$parent} {
-    color: $color !important;
-  }
-  @if $emphasized-link-hover-darken-percentage != 0 {
-    a#{$parent} {
-      @include hover-focus() {
-        color: darken($color, $emphasized-link-hover-darken-percentage) !important;
-      }
-    }
-  }
-  @include deprecate("`text-emphasis-variant()`", "v4.4.0", "v5", $ignore-warning);
-}
diff --git a/_sass/bootstrap/mixins/_text-hide.scss b/_sass/bootstrap/mixins/_text-hide.scss
deleted file mode 100644
index 3a923011ec..0000000000
--- a/_sass/bootstrap/mixins/_text-hide.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-// CSS image replacement
-@mixin text-hide($ignore-warning: false) {
-  // stylelint-disable-next-line font-family-no-missing-generic-family-keyword
-  font: 0/0 a;
-  color: transparent;
-  text-shadow: none;
-  background-color: transparent;
-  border: 0;
-
-  @include deprecate("`text-hide()`", "v4.1.0", "v5", $ignore-warning);
-}
diff --git a/_sass/bootstrap/mixins/_transition.scss b/_sass/bootstrap/mixins/_transition.scss
index 54870bf6a8..d437f6d8f4 100644
--- a/_sass/bootstrap/mixins/_transition.scss
+++ b/_sass/bootstrap/mixins/_transition.scss
@@ -17,7 +17,7 @@
       transition: $transition;
     }
 
-    @if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none {
+    @if $enable-reduced-motion and nth($transition, 1) != null and nth($transition, 1) != none {
       @media (prefers-reduced-motion: reduce) {
         transition: none;
       }
diff --git a/_sass/bootstrap/mixins/_utilities.scss b/_sass/bootstrap/mixins/_utilities.scss
new file mode 100644
index 0000000000..4795e89400
--- /dev/null
+++ b/_sass/bootstrap/mixins/_utilities.scss
@@ -0,0 +1,97 @@
+// Utility generator
+// Used to generate utilities & print utilities
+@mixin generate-utility($utility, $infix: "", $is-rfs-media-query: false) {
+  $values: map-get($utility, values);
+
+  // If the values are a list or string, convert it into a map
+  @if type-of($values) == "string" or type-of(nth($values, 1)) != "list" {
+    $values: zip($values, $values);
+  }
+
+  @each $key, $value in $values {
+    $properties: map-get($utility, property);
+
+    // Multiple properties are possible, for example with vertical or horizontal margins or paddings
+    @if type-of($properties) == "string" {
+      $properties: append((), $properties);
+    }
+
+    // Use custom class if present
+    $property-class: if(map-has-key($utility, class), map-get($utility, class), nth($properties, 1));
+    $property-class: if($property-class == null, "", $property-class);
+
+    // Use custom CSS variable name if present, otherwise default to `class`
+    $css-variable-name: if(map-has-key($utility, css-variable-name), map-get($utility, css-variable-name), map-get($utility, class));
+
+    // State params to generate pseudo-classes
+    $state: if(map-has-key($utility, state), map-get($utility, state), ());
+
+    $infix: if($property-class == "" and str-slice($infix, 1, 1) == "-", str-slice($infix, 2), $infix);
+
+    // Don't prefix if value key is null (e.g. with shadow class)
+    $property-class-modifier: if($key, if($property-class == "" and $infix == "", "", "-") + $key, "");
+
+    @if map-get($utility, rfs) {
+      // Inside the media query
+      @if $is-rfs-media-query {
+        $val: rfs-value($value);
+
+        // Do not render anything if fluid and non fluid values are the same
+        $value: if($val == rfs-fluid-value($value), null, $val);
+      }
+      @else {
+        $value: rfs-fluid-value($value);
+      }
+    }
+
+    $is-css-var: map-get($utility, css-var);
+    $is-local-vars: map-get($utility, local-vars);
+    $is-rtl: map-get($utility, rtl);
+
+    @if $value != null {
+      @if $is-rtl == false {
+        /* rtl:begin:remove */
+      }
+
+      @if $is-css-var {
+        .#{$property-class + $infix + $property-class-modifier} {
+          --#{$prefix}#{$css-variable-name}: #{$value};
+        }
+
+        @each $pseudo in $state {
+          .#{$property-class + $infix + $property-class-modifier}-#{$pseudo}:#{$pseudo} {
+            --#{$prefix}#{$css-variable-name}: #{$value};
+          }
+        }
+      } @else {
+        .#{$property-class + $infix + $property-class-modifier} {
+          @each $property in $properties {
+            @if $is-local-vars {
+              @each $local-var, $variable in $is-local-vars {
+                --#{$prefix}#{$local-var}: #{$variable};
+              }
+            }
+            #{$property}: $value if($enable-important-utilities, !important, null);
+          }
+        }
+
+        @each $pseudo in $state {
+          .#{$property-class + $infix + $property-class-modifier}-#{$pseudo}:#{$pseudo} {
+            @each $property in $properties {
+              @if $is-local-vars {
+                @each $local-var, $variable in $is-local-vars {
+                  --#{$prefix}#{$local-var}: #{$variable};
+                }
+              }
+              #{$property}: $value if($enable-important-utilities, !important, null);
+            }
+          }
+        }
+      }
+
+      @if $is-rtl == false {
+        /* rtl:end:remove */
+      }
+    }
+  }
+}
diff --git a/_sass/bootstrap/mixins/_visibility.scss b/_sass/bootstrap/mixins/_visibility.scss
deleted file mode 100644
index f174673117..0000000000
--- a/_sass/bootstrap/mixins/_visibility.scss
+++ /dev/null
@@ -1,8 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Visibility
-
-@mixin invisible($visibility) {
-  visibility: $visibility !important;
-  @include deprecate("`invisible()`", "v4.3.0", "v5");
-}
diff --git a/_sass/bootstrap/mixins/_visually-hidden.scss b/_sass/bootstrap/mixins/_visually-hidden.scss
new file mode 100644
index 0000000000..082aeec957
--- /dev/null
+++ b/_sass/bootstrap/mixins/_visually-hidden.scss
@@ -0,0 +1,33 @@
+// stylelint-disable declaration-no-important
+
+// Hide content visually while keeping it accessible to assistive technologies
+//
+// See: https://www.a11yproject.com/posts/2013-01-11-how-to-hide-content/
+// See: https://kittygiraudel.com/2016/10/13/css-hide-and-seek/
+
+@mixin visually-hidden() {
+  width: 1px !important;
+  height: 1px !important;
+  padding: 0 !important;
+  margin: -1px !important; // Fix for https://github.com/twbs/bootstrap/issues/25686
+  overflow: hidden !important;
+  clip: rect(0, 0, 0, 0) !important;
+  white-space: nowrap !important;
+  border: 0 !important;
+
+  // Fix for positioned table caption that could become anonymous cells
+  &:not(caption) {
+    position: absolute !important;
+  }
+}
+
+// Use to only display content when it's focused, or one of its child elements is focused
+// (i.e. when focus is within the element/container that the class was applied to)
+//
+// Useful for "Skip to main content" links; see https://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+
+@mixin visually-hidden-focusable() {
+  &:not(:focus):not(:focus-within) {
+    @include visually-hidden();
+  }
+}
diff --git a/_sass/bootstrap/tests/jasmine.js b/_sass/bootstrap/tests/jasmine.js
new file mode 100644
index 0000000000..25d838c97a
--- /dev/null
+++ b/_sass/bootstrap/tests/jasmine.js
@@ -0,0 +1,16 @@
+/* eslint-disable camelcase */
+
+'use strict'
+
+const path = require('node:path')
+
+module.exports = {
+  spec_dir: 'scss',
+  // Make Jasmine look for `.test.scss` files
+  spec_files: ['**/*.{test,spec}.scss'],
+  // Compile them into JS scripts running `sass-true`
+  requires: [path.join(__dirname, 'sass-true/register')],
+  // Ensure we use `require` so that the require.extensions works
+  // as `import` completely bypasses it
+  jsLoader: 'require'
+}
diff --git a/_sass/bootstrap/tests/mixins/_color-modes.test.scss b/_sass/bootstrap/tests/mixins/_color-modes.test.scss
new file mode 100644
index 0000000000..9ecc628dea
--- /dev/null
+++ b/_sass/bootstrap/tests/mixins/_color-modes.test.scss
@@ -0,0 +1,69 @@
+// stylelint-disable selector-attribute-quotes
+
+@import "../../functions";
+@import "../../variables";
+@import "../../variables-dark";
+@import "../../maps";
+@import "../../mixins";
+
+@include describe("global $color-mode-type: data") {
+  @include it("generates data attribute selectors for dark mode") {
+    @include assert() {
+      @include output() {
+        @include color-mode(dark) {
+          .element {
+            color: var(--bs-primary-text-emphasis);
+            background-color: var(--bs-primary-bg-subtle);
+          }
+        }
+        @include color-mode(dark, true) {
+          --custom-color: #{mix($indigo, $blue, 50%)};
+        }
+      }
+      @include expect() {
+        [data-bs-theme=dark] .element {
+          color: var(--bs-primary-text-emphasis);
+          background-color: var(--bs-primary-bg-subtle);
+        }
+        [data-bs-theme=dark] {
+          --custom-color: #3a3ff8;
+        }
+      }
+    }
+  }
+}
+
+@include describe("global $color-mode-type: media-query") {
+  @include it("generates media queries for dark mode") {
+    $color-mode-type: media-query !global;
+
+    @include assert() {
+      @include output() {
+        @include color-mode(dark) {
+          .element {
+            color: var(--bs-primary-text-emphasis);
+            background-color: var(--bs-primary-bg-subtle);
+          }
+        }
+        @include color-mode(dark, true) {
+          --custom-color: #{mix($indigo, $blue, 50%)};
+        }
+      }
+      @include expect() {
+        @media (prefers-color-scheme: dark) {
+          .element {
+            color: var(--bs-primary-text-emphasis);
+            background-color: var(--bs-primary-bg-subtle);
+          }
+        }
+        @media (prefers-color-scheme: dark) {
+          :root {
+            --custom-color: #3a3ff8;
+          }
+        }
+      }
+    }
+
+    $color-mode-type: data !global;
+  }
+}
diff --git a/_sass/bootstrap/tests/mixins/_media-query-color-mode-full.test.scss b/_sass/bootstrap/tests/mixins/_media-query-color-mode-full.test.scss
new file mode 100644
index 0000000000..00ed82d6f6
--- /dev/null
+++ b/_sass/bootstrap/tests/mixins/_media-query-color-mode-full.test.scss
@@ -0,0 +1,8 @@
+$color-mode-type: media-query;
+
+@import "../../bootstrap";
+
+@include describe("global $color-mode-type: media-query") {
+  @include it("compiles entirely Bootstrap CSS with media-query color mode") { // stylelint-disable-line block-no-empty
+  }
+}
diff --git a/_sass/bootstrap/tests/mixins/_utilities.test.scss b/_sass/bootstrap/tests/mixins/_utilities.test.scss
new file mode 100644
index 0000000000..63fcae3af3
--- /dev/null
+++ b/_sass/bootstrap/tests/mixins/_utilities.test.scss
@@ -0,0 +1,393 @@
+$prefix: bs-;
+$enable-important-utilities: false;
+
+// Important: Do not import rfs to check that the mixin just calls the appropriate functions from it
+@import "../../mixins/utilities";
+
+@mixin test-generate-utility($params...) {
+  @include assert() {
+    @include output() {
+      @include generate-utility($params...);
+    }
+
+    @include expect() {
+      @content;
+    }
+  }
+}
+
+@include describe(generate-utility) {
+  @include it("generates a utility class for each value") {
+    @include test-generate-utility(
+      (
+        property: "padding",
+        values: (small: .5rem, large: 2rem)
+      )
+    ) {
+      .padding-small {
+        padding: .5rem;
+      }
+
+      .padding-large {
+        padding: 2rem;
+      }
+    }
+  }
+
+  @include describe("global $enable-important-utilities: true") {
+    @include it("sets !important") {
+      $enable-important-utilities: true !global;
+
+      @include test-generate-utility(
+        (
+          property: "padding",
+          values: (small: .5rem, large: 2rem)
+        )
+      ) {
+        .padding-small {
+          padding: .5rem !important;
+        }
+
+        .padding-large {
+          padding: 2rem !important;
+        }
+      }
+
+      $enable-important-utilities: false !global;
+    }
+  }
+
+  @include describe("$utility") {
+    @include describe("values") {
+      @include it("supports null keys") {
+        @include test-generate-utility(
+          (
+            property: "padding",
+            values: (null: 1rem, small: .5rem, large: 2rem)
+          ),
+        ) {
+          .padding {
+            padding: 1rem;
+          }
+
+          .padding-small {
+            padding: .5rem;
+          }
+
+          .padding-large {
+            padding: 2rem;
+          }
+        }
+      }
+
+      @include it("ignores null values") {
+        @include test-generate-utility(
+          (
+            property: "padding",
+            values: (small: null, large: 2rem)
+          )
+        ) {
+          .padding-large {
+            padding: 2rem;
+          }
+        }
+      }
+
+      @include it("supports lists") {
+        @include test-generate-utility(
+          (
+            property: "padding",
+            values: 1rem 2rem
+          )
+        ) {
+          .padding-1rem {
+            padding: 1rem;
+          }
+
+          .padding-2rem {
+            padding: 2rem;
+          }
+        }
+      }
+
+      @include it("supports single values") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            values: 1rem
+          )
+        ) {
+          .padding-1rem {
+            padding: 1rem;
+          }
+        }
+      }
+    }
+
+    @include describe("class & property") {
+      @include it("adds each property to the declaration") {
+        @include test-generate-utility(
+          (
+            class: padding-x,
+            property: padding-inline-start padding-inline-end,
+            values: 1rem
+          )
+        ) {
+          .padding-x-1rem {
+            padding-inline-start: 1rem;
+            padding-inline-end: 1rem;
+          }
+        }
+      }
+
+      @include it("uses the first property as class name") {
+        @include test-generate-utility(
+          (
+            property: padding-inline-start padding-inline-end,
+            values: 1rem
+          )
+        ) {
+          .padding-inline-start-1rem {
+            padding-inline-start: 1rem;
+            padding-inline-end: 1rem;
+          }
+        }
+      }
+
+      @include it("supports a null class to create classes straight from the values") {
+        @include test-generate-utility(
+          (
+            property: visibility,
+            class: null,
+            values: (
+              visible: visible,
+              invisible: hidden,
+            )
+          )
+        ) {
+          .visible {
+            visibility: visible;
+          }
+
+          .invisible {
+            visibility: hidden;
+          }
+        }
+      }
+    }
+
+    @include describe("state") {
+      @include it("Generates selectors for each states") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            values: 1rem,
+            state: hover focus,
+          )
+        ) {
+          .padding-1rem {
+            padding: 1rem;
+          }
+
+          .padding-1rem-hover:hover {
+            padding: 1rem;
+          }
+
+          .padding-1rem-focus:focus {
+            padding: 1rem;
+          }
+        }
+      }
+    }
+
+    @include describe("css-var"){
+      @include it("sets a CSS variable instead of the property") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            css-variable-name: padding,
+            css-var: true,
+            values: 1rem 2rem
+          )
+        ) {
+          .padding-1rem {
+            --bs-padding: 1rem;
+          }
+
+          .padding-2rem {
+            --bs-padding: 2rem;
+          }
+        }
+      }
+
+      @include it("defaults to class") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            class: padding,
+            css-var: true,
+            values: 1rem 2rem
+          )
+        ) {
+          .padding-1rem {
+            --bs-padding: 1rem;
+          }
+
+          .padding-2rem {
+            --bs-padding: 2rem;
+          }
+        }
+      }
+    }
+
+    @include describe("local-vars") {
+      @include it("generates the listed variables") {
+        @include test-generate-utility(
+          (
+            property: color,
+            class: desaturated-color,
+            local-vars: (
+              color-opacity: 1,
+              color-saturation: .25
+            ),
+            values: (
+              blue: hsla(192deg, var(--bs-color-saturation), 0, var(--bs-color-opacity))
+            )
+          )
+        ) {
+          .desaturated-color-blue {
+            --bs-color-opacity: 1;
+            // Sass compilation will put a leading zero so we want to keep that one
+            // stylelint-disable-next-line stylistic/number-leading-zero
+            --bs-color-saturation: 0.25;
+            color: hsla(192deg, var(--bs-color-saturation), 0, var(--bs-color-opacity));
+          }
+        }
+      }
+    }
+
+    @include describe("css-var & state") {
+      @include it("Generates a rule with for each state with a CSS variable") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            css-var: true,
+            css-variable-name: padding,
+            values: 1rem,
+            state: hover focus,
+          )
+        ) {
+          .padding-1rem {
+            --bs-padding: 1rem;
+          }
+
+          .padding-1rem-hover:hover {
+            --bs-padding: 1rem;
+          }
+
+          .padding-1rem-focus:focus {
+            --bs-padding: 1rem;
+          }
+        }
+      }
+    }
+
+    @include describe("rtl") {
+      @include it("sets up RTLCSS for removal when false") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            values: 1rem,
+            rtl: false
+          )
+        ) {
+          /* rtl:begin:remove */
+
+          .padding-1rem {
+            padding: 1rem;
+          }
+
+          /* rtl:end:remove */
+
+        }
+      }
+    }
+
+    @include describe("rfs") {
+      @include it("sets the fluid value when not inside media query") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            values: 1rem,
+            rfs: true
+          )
+        ) {
+          .padding-1rem {
+            padding: rfs-fluid-value(1rem);
+          }
+        }
+      }
+
+      @include it("sets the value when inside the media query") {
+        @include test-generate-utility(
+          (
+            property: padding,
+            values: 1rem,
+            rfs: true
+          ),
+          $is-rfs-media-query: true
+        ) {
+          .padding-1rem {
+            padding: rfs-value(1rem);
+          }
+        }
+      }
+    }
+  }
+
+  @include describe("$infix") {
+    @include it("inserts the given infix") {
+      @include test-generate-utility(
+        (
+          property: "padding",
+          values: (null: 1rem, small: .5rem, large: 2rem)
+        ),
+        $infix: -sm
+      ) {
+        .padding-sm {
+          padding: 1rem;
+        }
+
+        .padding-sm-small {
+          padding: .5rem;
+        }
+
+        .padding-sm-large {
+          padding: 2rem;
+        }
+      }
+    }
+
+    @include it("strips leading - if class is null") {
+      @include test-generate-utility(
+        (
+          property: visibility,
+          class: null,
+          values: (
+            visible: visible,
+            invisible: hidden,
+          )
+        ),
+        -sm
+      ) {
+        .sm-visible {
+          visibility: visible;
+        }
+
+        .sm-invisible {
+          visibility: hidden;
+        }
+      }
+    }
+  }
+}
diff --git a/_sass/bootstrap/tests/sass-true/register.js b/_sass/bootstrap/tests/sass-true/register.js
new file mode 100644
index 0000000000..d93e414c1f
--- /dev/null
+++ b/_sass/bootstrap/tests/sass-true/register.js
@@ -0,0 +1,14 @@
+'use strict'
+
+const path = require('node:path')
+
+const runnerPath = path.join(__dirname, 'runner').replace(/\\/g, '/')
+
+require.extensions['.scss'] = (module, filename) => {
+  const normalizedFilename = filename.replace(/\\/g, '/')
+
+  return module._compile(`
+    const runner = require('${runnerPath}')
+    runner('${normalizedFilename}', { describe, it })
+    `, filename)
+}
diff --git a/_sass/bootstrap/tests/sass-true/runner.js b/_sass/bootstrap/tests/sass-true/runner.js
new file mode 100644
index 0000000000..bef870ac6b
--- /dev/null
+++ b/_sass/bootstrap/tests/sass-true/runner.js
@@ -0,0 +1,17 @@
+'use strict'
+
+const fs = require('node:fs')
+const path = require('node:path')
+const { runSass } = require('sass-true')
+
+module.exports = (filename, { describe, it }) => {
+  const data = fs.readFileSync(filename, 'utf8')
+  const TRUE_SETUP = '$true-terminal-output: false; @import "true";'
+  const sassString = TRUE_SETUP + data
+
+  runSass(
+    { describe, it, sourceType: 'string' },
+    sassString,
+    { loadPaths: [path.dirname(filename)] }
+  )
+}
diff --git a/_sass/bootstrap/tests/utilities/_api.test.scss b/_sass/bootstrap/tests/utilities/_api.test.scss
new file mode 100644
index 0000000000..304d8d1c94
--- /dev/null
+++ b/_sass/bootstrap/tests/utilities/_api.test.scss
@@ -0,0 +1,75 @@
+@import "../../functions";
+@import "../../variables";
+@import "../../variables-dark";
+@import "../../maps";
+@import "../../mixins";
+
+$utilities: ();
+
+@include describe("utilities/api") {
+  @include it("generates utilities for each breakpoints") {
+    $utilities: (
+      margin: (
+        property: margin,
+        values: auto
+      ),
+      padding: (
+        property: padding,
+        responsive: true,
+        values: 1rem
+      ),
+      font-size: (
+        property: font-size,
+        values: (large: 1.25rem),
+        print: true
+      )
+    ) !global;
+
+    $grid-breakpoints: (
+      xs: 0,
+      sm: 333px,
+      md: 666px
+    ) !global;
+
+    @include assert() {
+      @include output() {
+        @import "../../utilities/api";
+      }
+
+      @include expect() {
+        // margin is not set to responsive
+        .margin-auto {
+          margin: auto !important;
+        }
+
+        // padding is, though
+        .padding-1rem {
+          padding: 1rem !important;
+        }
+
+        .font-size-large {
+          font-size: 1.25rem !important;
+        }
+
+        @media (min-width: 333px) {
+          .padding-sm-1rem {
+            padding: 1rem !important;
+          }
+        }
+
+        @media (min-width: 666px) {
+          .padding-md-1rem {
+            padding: 1rem !important;
+          }
+        }
+
+        @media print {
+          .font-size-print-large {
+            font-size: 1.25rem !important;
+          }
+        }
+      }
+
+    }
+  }
+}
diff --git a/_sass/bootstrap/utilities/_align.scss b/_sass/bootstrap/utilities/_align.scss
deleted file mode 100644
index 8b7df9f76c..0000000000
--- a/_sass/bootstrap/utilities/_align.scss
+++ /dev/null
@@ -1,8 +0,0 @@
-// stylelint-disable declaration-no-important
-
-.align-baseline    { vertical-align: baseline !important; } // Browser default
-.align-top         { vertical-align: top !important; }
-.align-middle      { vertical-align: middle !important; }
-.align-bottom      { vertical-align: bottom !important; }
-.align-text-bottom { vertical-align: text-bottom !important; }
-.align-text-top    { vertical-align: text-top !important; }
diff --git a/_sass/bootstrap/utilities/_api.scss b/_sass/bootstrap/utilities/_api.scss
new file mode 100644
index 0000000000..62e1d398e3
--- /dev/null
+++ b/_sass/bootstrap/utilities/_api.scss
@@ -0,0 +1,47 @@
+// Loop over each breakpoint
+@each $breakpoint in map-keys($grid-breakpoints) {
+
+  // Generate media query if needed
+  @include media-breakpoint-up($breakpoint) {
+    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+    // Loop over each utility property
+    @each $key, $utility in $utilities {
+      // The utility can be disabled with `false`, thus check if the utility is a map first
+      // Only proceed if responsive media queries are enabled or if it's the base media query
+      @if type-of($utility) == "map" and (map-get($utility, responsive) or $infix == "") {
+        @include generate-utility($utility, $infix);
+      }
+    }
+  }
+}
+
+// RFS rescaling
+@media (min-width: $rfs-mq-value) {
+  @each $breakpoint in map-keys($grid-breakpoints) {
+    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+    @if (map-get($grid-breakpoints, $breakpoint) < $rfs-breakpoint) {
+      // Loop over each utility property
+      @each $key, $utility in $utilities {
+        // The utility can be disabled with `false`, thus check if the utility is a map first
+        // Only proceed if responsive media queries are enabled or if it's the base media query
+        @if type-of($utility) == "map" and map-get($utility, rfs) and (map-get($utility, responsive) or $infix == "") {
+          @include generate-utility($utility, $infix, true);
+        }
+      }
+    }
+  }
+}
+
+
+// Print utilities
+@media print {
+  @each $key, $utility in $utilities {
+    // The utility can be disabled with `false`, thus check if the utility is a map first
+    // Then check if the utility needs print styles
+    @if type-of($utility) == "map" and map-get($utility, print) == true {
+      @include generate-utility($utility, "-print");
+    }
+  }
+}
diff --git a/_sass/bootstrap/utilities/_background.scss b/_sass/bootstrap/utilities/_background.scss
deleted file mode 100644
index 3accbc4fd4..0000000000
--- a/_sass/bootstrap/utilities/_background.scss
+++ /dev/null
@@ -1,19 +0,0 @@
-// stylelint-disable declaration-no-important
-
-@each $color, $value in $theme-colors {
-  @include bg-variant(".bg-#{$color}", $value, true);
-}
-
-@if $enable-gradients {
-  @each $color, $value in $theme-colors {
-    @include bg-gradient-variant(".bg-gradient-#{$color}", $value, true);
-  }
-}
-
-.bg-white {
-  background-color: $white !important;
-}
-
-.bg-transparent {
-  background-color: transparent !important;
-}
diff --git a/_sass/bootstrap/utilities/_borders.scss b/_sass/bootstrap/utilities/_borders.scss
deleted file mode 100644
index 205f3fc24e..0000000000
--- a/_sass/bootstrap/utilities/_borders.scss
+++ /dev/null
@@ -1,75 +0,0 @@
-// stylelint-disable property-disallowed-list, declaration-no-important
-
-//
-// Border
-//
-
-.border         { border: $border-width solid $border-color !important; }
-.border-top     { border-top: $border-width solid $border-color !important; }
-.border-right   { border-right: $border-width solid $border-color !important; }
-.border-bottom  { border-bottom: $border-width solid $border-color !important; }
-.border-left    { border-left: $border-width solid $border-color !important; }
-
-.border-0        { border: 0 !important; }
-.border-top-0    { border-top: 0 !important; }
-.border-right-0  { border-right: 0 !important; }
-.border-bottom-0 { border-bottom: 0 !important; }
-.border-left-0   { border-left: 0 !important; }
-
-@each $color, $value in $theme-colors {
-  .border-#{$color} {
-    border-color: $value !important;
-  }
-}
-
-.border-white {
-  border-color: $white !important;
-}
-
-//
-// Border-radius
-//
-
-.rounded-sm {
-  border-radius: $border-radius-sm !important;
-}
-
-.rounded {
-  border-radius: $border-radius !important;
-}
-
-.rounded-top {
-  border-top-left-radius: $border-radius !important;
-  border-top-right-radius: $border-radius !important;
-}
-
-.rounded-right {
-  border-top-right-radius: $border-radius !important;
-  border-bottom-right-radius: $border-radius !important;
-}
-
-.rounded-bottom {
-  border-bottom-right-radius: $border-radius !important;
-  border-bottom-left-radius: $border-radius !important;
-}
-
-.rounded-left {
-  border-top-left-radius: $border-radius !important;
-  border-bottom-left-radius: $border-radius !important;
-}
-
-.rounded-lg {
-  border-radius: $border-radius-lg !important;
-}
-
-.rounded-circle {
-  border-radius: 50% !important;
-}
-
-.rounded-pill {
-  border-radius: $rounded-pill !important;
-}
-
-.rounded-0 {
-  border-radius: 0 !important;
-}
diff --git a/_sass/bootstrap/utilities/_display.scss b/_sass/bootstrap/utilities/_display.scss
deleted file mode 100644
index 130367998f..0000000000
--- a/_sass/bootstrap/utilities/_display.scss
+++ /dev/null
@@ -1,26 +0,0 @@
-// stylelint-disable declaration-no-important
-
-//
-// Utilities for common `display` values
-//
-
-@each $breakpoint in map-keys($grid-breakpoints) {
-  @include media-breakpoint-up($breakpoint) {
-    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
-
-    @each $value in $displays {
-      .d#{$infix}-#{$value} { display: $value !important; }
-    }
-  }
-}
-
-
-//
-// Utilities for toggling `display` in print
-//
-
-@media print {
-  @each $value in $displays {
-    .d-print-#{$value} { display: $value !important; }
-  }
-}
diff --git a/_sass/bootstrap/utilities/_embed.scss b/_sass/bootstrap/utilities/_embed.scss
deleted file mode 100644
index 4497ac0400..0000000000
--- a/_sass/bootstrap/utilities/_embed.scss
+++ /dev/null
@@ -1,39 +0,0 @@
-// Credit: Nicolas Gallagher and SUIT CSS.
-
-.embed-responsive {
-  position: relative;
-  display: block;
-  width: 100%;
-  padding: 0;
-  overflow: hidden;
-
-  &::before {
-    display: block;
-    content: "";
-  }
-
-  .embed-responsive-item,
-  iframe,
-  embed,
-  object,
-  video {
-    position: absolute;
-    top: 0;
-    bottom: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
-    border: 0;
-  }
-}
-
-@each $embed-responsive-aspect-ratio in $embed-responsive-aspect-ratios {
-  $embed-responsive-aspect-ratio-x: nth($embed-responsive-aspect-ratio, 1);
-  $embed-responsive-aspect-ratio-y: nth($embed-responsive-aspect-ratio, 2);
-
-  .embed-responsive-#{$embed-responsive-aspect-ratio-x}by#{$embed-responsive-aspect-ratio-y} {
-    &::before {
-      padding-top: percentage($embed-responsive-aspect-ratio-y / $embed-responsive-aspect-ratio-x);
-    }
-  }
-}
diff --git a/_sass/bootstrap/utilities/_flex.scss b/_sass/bootstrap/utilities/_flex.scss
deleted file mode 100644
index 3d4266e0d0..0000000000
--- a/_sass/bootstrap/utilities/_flex.scss
+++ /dev/null
@@ -1,51 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Flex variation
-//
-// Custom styles for additional flex alignment options.
-
-@each $breakpoint in map-keys($grid-breakpoints) {
-  @include media-breakpoint-up($breakpoint) {
-    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
-
-    .flex#{$infix}-row            { flex-direction: row !important; }
-    .flex#{$infix}-column         { flex-direction: column !important; }
-    .flex#{$infix}-row-reverse    { flex-direction: row-reverse !important; }
-    .flex#{$infix}-column-reverse { flex-direction: column-reverse !important; }
-
-    .flex#{$infix}-wrap         { flex-wrap: wrap !important; }
-    .flex#{$infix}-nowrap       { flex-wrap: nowrap !important; }
-    .flex#{$infix}-wrap-reverse { flex-wrap: wrap-reverse !important; }
-    .flex#{$infix}-fill         { flex: 1 1 auto !important; }
-    .flex#{$infix}-grow-0       { flex-grow: 0 !important; }
-    .flex#{$infix}-grow-1       { flex-grow: 1 !important; }
-    .flex#{$infix}-shrink-0     { flex-shrink: 0 !important; }
-    .flex#{$infix}-shrink-1     { flex-shrink: 1 !important; }
-
-    .justify-content#{$infix}-start   { justify-content: flex-start !important; }
-    .justify-content#{$infix}-end     { justify-content: flex-end !important; }
-    .justify-content#{$infix}-center  { justify-content: center !important; }
-    .justify-content#{$infix}-between { justify-content: space-between !important; }
-    .justify-content#{$infix}-around  { justify-content: space-around !important; }
-
-    .align-items#{$infix}-start    { align-items: flex-start !important; }
-    .align-items#{$infix}-end      { align-items: flex-end !important; }
-    .align-items#{$infix}-center   { align-items: center !important; }
-    .align-items#{$infix}-baseline { align-items: baseline !important; }
-    .align-items#{$infix}-stretch  { align-items: stretch !important; }
-
-    .align-content#{$infix}-start   { align-content: flex-start !important; }
-    .align-content#{$infix}-end     { align-content: flex-end !important; }
-    .align-content#{$infix}-center  { align-content: center !important; }
-    .align-content#{$infix}-between { align-content: space-between !important; }
-    .align-content#{$infix}-around  { align-content: space-around !important; }
-    .align-content#{$infix}-stretch { align-content: stretch !important; }
-
-    .align-self#{$infix}-auto     { align-self: auto !important; }
-    .align-self#{$infix}-start    { align-self: flex-start !important; }
-    .align-self#{$infix}-end      { align-self: flex-end !important; }
-    .align-self#{$infix}-center   { align-self: center !important; }
-    .align-self#{$infix}-baseline { align-self: baseline !important; }
-    .align-self#{$infix}-stretch  { align-self: stretch !important; }
-  }
-}
diff --git a/_sass/bootstrap/utilities/_float.scss b/_sass/bootstrap/utilities/_float.scss
deleted file mode 100644
index 54250844ff..0000000000
--- a/_sass/bootstrap/utilities/_float.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-// stylelint-disable declaration-no-important
-
-@each $breakpoint in map-keys($grid-breakpoints) {
-  @include media-breakpoint-up($breakpoint) {
-    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
-
-    .float#{$infix}-left  { float: left !important; }
-    .float#{$infix}-right { float: right !important; }
-    .float#{$infix}-none  { float: none !important; }
-  }
-}
diff --git a/_sass/bootstrap/utilities/_interactions.scss b/_sass/bootstrap/utilities/_interactions.scss
deleted file mode 100644
index cc75fc21b7..0000000000
--- a/_sass/bootstrap/utilities/_interactions.scss
+++ /dev/null
@@ -1,5 +0,0 @@
-// stylelint-disable declaration-no-important
-
-@each $value in $user-selects {
-  .user-select-#{$value} { user-select: $value !important; }
-}
diff --git a/_sass/bootstrap/utilities/_overflow.scss b/_sass/bootstrap/utilities/_overflow.scss
deleted file mode 100644
index 8326c30641..0000000000
--- a/_sass/bootstrap/utilities/_overflow.scss
+++ /dev/null
@@ -1,5 +0,0 @@
-// stylelint-disable declaration-no-important
-
-@each $value in $overflows {
-  .overflow-#{$value} { overflow: $value !important; }
-}
diff --git a/_sass/bootstrap/utilities/_position.scss b/_sass/bootstrap/utilities/_position.scss
deleted file mode 100644
index cdf6c115f3..0000000000
--- a/_sass/bootstrap/utilities/_position.scss
+++ /dev/null
@@ -1,32 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Common values
-@each $position in $positions {
-  .position-#{$position} { position: $position !important; }
-}
-
-// Shorthand
-
-.fixed-top {
-  position: fixed;
-  top: 0;
-  right: 0;
-  left: 0;
-  z-index: $zindex-fixed;
-}
-
-.fixed-bottom {
-  position: fixed;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  z-index: $zindex-fixed;
-}
-
-.sticky-top {
-  @supports (position: sticky) {
-    position: sticky;
-    top: 0;
-    z-index: $zindex-sticky;
-  }
-}
diff --git a/_sass/bootstrap/utilities/_screenreaders.scss b/_sass/bootstrap/utilities/_screenreaders.scss
deleted file mode 100644
index 9f26fde035..0000000000
--- a/_sass/bootstrap/utilities/_screenreaders.scss
+++ /dev/null
@@ -1,11 +0,0 @@
-//
-// Screenreaders
-//
-
-.sr-only {
-  @include sr-only();
-}
-
-.sr-only-focusable {
-  @include sr-only-focusable();
-}
diff --git a/_sass/bootstrap/utilities/_shadows.scss b/_sass/bootstrap/utilities/_shadows.scss
deleted file mode 100644
index f5d03fcd59..0000000000
--- a/_sass/bootstrap/utilities/_shadows.scss
+++ /dev/null
@@ -1,6 +0,0 @@
-// stylelint-disable declaration-no-important
-
-.shadow-sm { box-shadow: $box-shadow-sm !important; }
-.shadow { box-shadow: $box-shadow !important; }
-.shadow-lg { box-shadow: $box-shadow-lg !important; }
-.shadow-none { box-shadow: none !important; }
diff --git a/_sass/bootstrap/utilities/_sizing.scss b/_sass/bootstrap/utilities/_sizing.scss
deleted file mode 100644
index f376488022..0000000000
--- a/_sass/bootstrap/utilities/_sizing.scss
+++ /dev/null
@@ -1,20 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Width and height
-
-@each $prop, $abbrev in (width: w, height: h) {
-  @each $size, $length in $sizes {
-    .#{$abbrev}-#{$size} { #{$prop}: $length !important; }
-  }
-}
-
-.mw-100 { max-width: 100% !important; }
-.mh-100 { max-height: 100% !important; }
-
-// Viewport additional helpers
-
-.min-vw-100 { min-width: 100vw !important; }
-.min-vh-100 { min-height: 100vh !important; }
-
-.vw-100 { width: 100vw !important; }
-.vh-100 { height: 100vh !important; }
diff --git a/_sass/bootstrap/utilities/_spacing.scss b/_sass/bootstrap/utilities/_spacing.scss
deleted file mode 100644
index 351136790a..0000000000
--- a/_sass/bootstrap/utilities/_spacing.scss
+++ /dev/null
@@ -1,73 +0,0 @@
-// stylelint-disable declaration-no-important
-
-// Margin and Padding
-
-@each $breakpoint in map-keys($grid-breakpoints) {
-  @include media-breakpoint-up($breakpoint) {
-    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
-
-    @each $prop, $abbrev in (margin: m, padding: p) {
-      @each $size, $length in $spacers {
-        .#{$abbrev}#{$infix}-#{$size} { #{$prop}: $length !important; }
-        .#{$abbrev}t#{$infix}-#{$size},
-        .#{$abbrev}y#{$infix}-#{$size} {
-          #{$prop}-top: $length !important;
-        }
-        .#{$abbrev}r#{$infix}-#{$size},
-        .#{$abbrev}x#{$infix}-#{$size} {
-          #{$prop}-right: $length !important;
-        }
-        .#{$abbrev}b#{$infix}-#{$size},
-        .#{$abbrev}y#{$infix}-#{$size} {
-          #{$prop}-bottom: $length !important;
-        }
-        .#{$abbrev}l#{$infix}-#{$size},
-        .#{$abbrev}x#{$infix}-#{$size} {
-          #{$prop}-left: $length !important;
-        }
-      }
-    }
-
-    // Negative margins (e.g., where `.mb-n1` is negative version of `.mb-1`)
-    @each $size, $length in $spacers {
-      @if $size != 0 {
-        .m#{$infix}-n#{$size} { margin: -$length !important; }
-        .mt#{$infix}-n#{$size},
-        .my#{$infix}-n#{$size} {
-          margin-top: -$length !important;
-        }
-        .mr#{$infix}-n#{$size},
-        .mx#{$infix}-n#{$size} {
-          margin-right: -$length !important;
-        }
-        .mb#{$infix}-n#{$size},
-        .my#{$infix}-n#{$size} {
-          margin-bottom: -$length !important;
-        }
-        .ml#{$infix}-n#{$size},
-        .mx#{$infix}-n#{$size} {
-          margin-left: -$length !important;
-        }
-      }
-    }
-
-    // Some special margin utils
-    .m#{$infix}-auto { margin: auto !important; }
-    .mt#{$infix}-auto,
-    .my#{$infix}-auto {
-      margin-top: auto !important;
-    }
-    .mr#{$infix}-auto,
-    .mx#{$infix}-auto {
-      margin-right: auto !important;
-    }
-    .mb#{$infix}-auto,
-    .my#{$infix}-auto {
-      margin-bottom: auto !important;
-    }
-    .ml#{$infix}-auto,
-    .mx#{$infix}-auto {
-      margin-left: auto !important;
-    }
-  }
-}
diff --git a/_sass/bootstrap/utilities/_stretched-link.scss b/_sass/bootstrap/utilities/_stretched-link.scss
deleted file mode 100644
index fb5066bf55..0000000000
--- a/_sass/bootstrap/utilities/_stretched-link.scss
+++ /dev/null
@@ -1,19 +0,0 @@
-//
-// Stretched link
-//
-
-.stretched-link {
-  &::after {
-    position: absolute;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    left: 0;
-    z-index: 1;
-    // Just in case `pointer-events: none` is set on a parent
-    pointer-events: auto;
-    content: "";
-    // IE10 bugfix, see https://stackoverflow.com/questions/16947967/ie10-hover-pseudo-class-doesnt-work-without-background-color
-    background-color: rgba(0, 0, 0, 0);
-  }
-}
diff --git a/_sass/bootstrap/utilities/_text.scss b/_sass/bootstrap/utilities/_text.scss
deleted file mode 100644
index 3a9f83edf0..0000000000
--- a/_sass/bootstrap/utilities/_text.scss
+++ /dev/null
@@ -1,72 +0,0 @@
-// stylelint-disable declaration-no-important
-
-//
-// Text
-//
-
-.text-monospace { font-family: $font-family-monospace !important; }
-
-// Alignment
-
-.text-justify  { text-align: justify !important; }
-.text-wrap     { white-space: normal !important; }
-.text-nowrap   { white-space: nowrap !important; }
-.text-truncate { @include text-truncate(); }
-
-// Responsive alignment
-
-@each $breakpoint in map-keys($grid-breakpoints) {
-  @include media-breakpoint-up($breakpoint) {
-    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
-
-    .text#{$infix}-left   { text-align: left !important; }
-    .text#{$infix}-right  { text-align: right !important; }
-    .text#{$infix}-center { text-align: center !important; }
-  }
-}
-
-// Transformation
-
-.text-lowercase  { text-transform: lowercase !important; }
-.text-uppercase  { text-transform: uppercase !important; }
-.text-capitalize { text-transform: capitalize !important; }
-
-// Weight and italics
-
-.font-weight-light   { font-weight: $font-weight-light !important; }
-.font-weight-lighter { font-weight: $font-weight-lighter !important; }
-.font-weight-normal  { font-weight: $font-weight-normal !important; }
-.font-weight-bold    { font-weight: $font-weight-bold !important; }
-.font-weight-bolder  { font-weight: $font-weight-bolder !important; }
-.font-italic         { font-style: italic !important; }
-
-// Contextual colors
-
-.text-white { color: $white !important; }
-
-@each $color, $value in $theme-colors {
-  @include text-emphasis-variant(".text-#{$color}", $value, true);
-}
-
-.text-body { color: $body-color !important; }
-.text-muted { color: $text-muted !important; }
-
-.text-black-50 { color: rgba($black, .5) !important; }
-.text-white-50 { color: rgba($white, .5) !important; }
-
-// Misc
-
-.text-hide {
-  @include text-hide($ignore-warning: true);
-}
-
-.text-decoration-none { text-decoration: none !important; }
-
-.text-break {
-  word-break: break-word !important; // Deprecated, but avoids issues with flex containers
-  word-wrap: break-word !important; // Used instead of `overflow-wrap` for IE & Edge Legacy
-}
-
-// Reset
-
-.text-reset { color: inherit !important; }
diff --git a/_sass/bootstrap/utilities/_visibility.scss b/_sass/bootstrap/utilities/_visibility.scss
deleted file mode 100644
index 7756c3bfac..0000000000
--- a/_sass/bootstrap/utilities/_visibility.scss
+++ /dev/null
@@ -1,13 +0,0 @@
-// stylelint-disable declaration-no-important
-
-//
-// Visibility utilities
-//
-
-.visible {
-  visibility: visible !important;
-}
-
-.invisible {
-  visibility: hidden !important;
-}
diff --git a/_sass/bootstrap/vendor/_rfs.scss b/_sass/bootstrap/vendor/_rfs.scss
index 1e3307ea8b..aa1f82b961 100644
--- a/_sass/bootstrap/vendor/_rfs.scss
+++ b/_sass/bootstrap/vendor/_rfs.scss
@@ -1,33 +1,42 @@
-// stylelint-disable property-blacklist, scss/dollar-variable-default
+// stylelint-disable scss/dimension-no-non-numeric-values
 
 // SCSS RFS mixin
 //
-// Automated font-resizing
+// Automated responsive values for font sizes, paddings, margins and much more
 //
-// See https://github.com/twbs/rfs
+// Licensed under MIT (https://github.com/twbs/rfs/blob/main/LICENSE)
 
 // Configuration
 
-// Base font size
-@use "sass:math";
+// Base value
+$rfs-base-value: 1.25rem !default;
+$rfs-unit: rem !default;
 
-$rfs-base-font-size: 1.25rem !default;
-$rfs-font-size-unit: rem !default;
+@if $rfs-unit != rem and $rfs-unit != px {
+  @error "`#{$rfs-unit}` is not a valid unit for $rfs-unit. Use `px` or `rem`.";
+}
 
-// Breakpoint at where font-size starts decreasing if screen width is smaller
+// Breakpoint at where values start decreasing if screen width is smaller
 $rfs-breakpoint: 1200px !default;
 $rfs-breakpoint-unit: px !default;
 
-// Resize font-size based on screen height and width
+@if $rfs-breakpoint-unit != px and $rfs-breakpoint-unit != em and $rfs-breakpoint-unit != rem {
+  @error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
+}
+
+// Resize values based on screen height and width
 $rfs-two-dimensional: false !default;
 
 // Factor of decrease
 $rfs-factor: 10 !default;
 
-@if type-of($rfs-factor) != "number" or $rfs-factor <= 1 {
+@if type-of($rfs-factor) != number or $rfs-factor <= 1 {
   @error "`#{$rfs-factor}` is not a valid  $rfs-factor, it must be greater than 1.";
 }
 
+// Mode. Possibilities: "min-media-query", "max-media-query"
+$rfs-mode: min-media-query !default;
+
 // Generate enable or disable classes. Possibilities: false, "enable" or "disable"
 $rfs-class: false !default;
 
@@ -37,170 +46,303 @@ $rfs-rem-value: 16 !default;
 // Safari iframe resize bug: https://github.com/twbs/rfs/issues/14
 $rfs-safari-iframe-resize-bug-fix: false !default;
 
-// Disable RFS by setting $enable-responsive-font-sizes to false
-$enable-responsive-font-sizes: true !default;
+// Disable RFS by setting $enable-rfs to false
+$enable-rfs: true !default;
+
+// Cache $rfs-base-value unit
+$rfs-base-value-unit: unit($rfs-base-value);
 
-// Cache $rfs-base-font-size unit
-$rfs-base-font-size-unit: unit($rfs-base-font-size);
+@function divide($dividend, $divisor, $precision: 10) {
+  $sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
+  $dividend: abs($dividend);
+  $divisor: abs($divisor);
+  @if $dividend == 0 {
+    @return 0;
+  }
+  @if $divisor == 0 {
+    @error "Cannot divide by 0";
+  }
+  $remainder: $dividend;
+  $result: 0;
+  $factor: 10;
+  @while ($remainder > 0 and $precision >= 0) {
+    $quotient: 0;
+    @while ($remainder >= $divisor) {
+      $remainder: $remainder - $divisor;
+      $quotient: $quotient + 1;
+    }
+    $result: $result * 10 + $quotient;
+    $factor: $factor * .1;
+    $remainder: $remainder * 10;
+    $precision: $precision - 1;
+    @if ($precision < 0 and $remainder >= $divisor * 5) {
+      $result: $result + 1;
+    }
+  }
+  $result: $result * $factor * $sign;
+  $dividend-unit: unit($dividend);
+  $divisor-unit: unit($divisor);
+  $unit-map: (
+    "px": 1px,
+    "rem": 1rem,
+    "em": 1em,
+    "%": 1%
+  );
+  @if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
+    $result: $result * map-get($unit-map, $dividend-unit);
+  }
+  @return $result;
+}
 
-// Remove px-unit from $rfs-base-font-size for calculations
-@if $rfs-base-font-size-unit == "px" {
-  $rfs-base-font-size: math.div($rfs-base-font-size, $rfs-base-font-size * 0 + 1);
+// Remove px-unit from $rfs-base-value for calculations
+@if $rfs-base-value-unit == px {
+  $rfs-base-value: divide($rfs-base-value, $rfs-base-value * 0 + 1);
 }
-@else if $rfs-base-font-size-unit == "rem" {
-  $rfs-base-font-size: math.div($rfs-base-font-size, $rfs-base-font-size * 0 + math.div(1, $rfs-rem-value));
+@else if $rfs-base-value-unit == rem {
+  $rfs-base-value: divide($rfs-base-value, divide($rfs-base-value * 0 + 1, $rfs-rem-value));
 }
 
 // Cache $rfs-breakpoint unit to prevent multiple calls
 $rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
 
 // Remove unit from $rfs-breakpoint for calculations
-@if $rfs-breakpoint-unit-cache == "px" {
-  $rfs-breakpoint: math.div($rfs-breakpoint, $rfs-breakpoint * 0 + 1);
+@if $rfs-breakpoint-unit-cache == px {
+  $rfs-breakpoint: divide($rfs-breakpoint, $rfs-breakpoint * 0 + 1);
 }
-@else if $rfs-breakpoint-unit-cache == "rem" or $rfs-breakpoint-unit-cache == "em" {
-  $rfs-breakpoint: math.div($rfs-breakpoint, $rfs-breakpoint * 0 + math.div(1, $rfs-rem-value));
+@else if $rfs-breakpoint-unit-cache == rem or $rfs-breakpoint-unit-cache == "em" {
+  $rfs-breakpoint: divide($rfs-breakpoint, divide($rfs-breakpoint * 0 + 1, $rfs-rem-value));
 }
 
-// Responsive font-size mixin
-@mixin rfs($fs, $important: false) {
-  // Cache $fs unit
-  $fs-unit: if(type-of($fs) == "number", unit($fs), false);
-
-  // Add !important suffix if needed
-  $rfs-suffix: if($important, " !important", "");
-
-  // If $fs isn't a number (like inherit) or $fs has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
-  @if not $fs-unit or $fs-unit != "" and $fs-unit != "px" and $fs-unit != "rem" or $fs == 0 {
-    font-size: #{$fs}#{$rfs-suffix};
+// Calculate the media query value
+$rfs-mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{divide($rfs-breakpoint, $rfs-rem-value)}#{$rfs-breakpoint-unit});
+$rfs-mq-property-width: if($rfs-mode == max-media-query, max-width, min-width);
+$rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height);
+
+// Internal mixin used to determine which media query needs to be used
+@mixin _rfs-media-query {
+  @if $rfs-two-dimensional {
+    @if $rfs-mode == max-media-query {
+      @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}), (#{$rfs-mq-property-height}: #{$rfs-mq-value}) {
+        @content;
+      }
+    }
+    @else {
+      @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}) and (#{$rfs-mq-property-height}: #{$rfs-mq-value}) {
+        @content;
+      }
+    }
   }
   @else {
-    // Variables for storing static and fluid rescaling
-    $rfs-static: null;
-    $rfs-fluid: null;
+    @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}) {
+      @content;
+    }
+  }
+}
 
-    // Remove px-unit from $fs for calculations
-    @if $fs-unit == "px" {
-      $fs: math.div($fs, $fs * 0 + 1);
+// Internal mixin that adds disable classes to the selector if needed.
+@mixin _rfs-rule {
+  @if $rfs-class == disable and $rfs-mode == max-media-query {
+    // Adding an extra class increases specificity, which prevents the media query to override the property
+    &,
+    .disable-rfs &,
+    &.disable-rfs {
+      @content;
     }
-    @else if $fs-unit == "rem" {
-      $fs: math.div($fs, $fs * 0 + math.div(1, $rfs-rem-value));
+  }
+  @else if $rfs-class == enable and $rfs-mode == min-media-query {
+    .enable-rfs &,
+    &.enable-rfs {
+      @content;
+    }
+  } @else {
+    @content;
+  }
+}
+
+// Internal mixin that adds enable classes to the selector if needed.
+@mixin _rfs-media-query-rule {
+
+  @if $rfs-class == enable {
+    @if $rfs-mode == min-media-query {
+      @content;
     }
 
-    // Set default font-size
-    @if $rfs-font-size-unit == rem {
-      $rfs-static: #{math.div($fs, $rfs-rem-value)}rem#{$rfs-suffix};
+    @include _rfs-media-query () {
+      .enable-rfs &,
+      &.enable-rfs {
+        @content;
+      }
+    }
+  }
+  @else {
+    @if $rfs-class == disable and $rfs-mode == min-media-query {
+      .disable-rfs &,
+      &.disable-rfs {
+        @content;
+      }
     }
-    @else if $rfs-font-size-unit == px {
-      $rfs-static: #{$fs}px#{$rfs-suffix};
+    @include _rfs-media-query () {
+      @content;
+    }
+  }
+}
+
+// Helper function to get the formatted non-responsive value
+@function rfs-value($values) {
+  // Convert to list
+  $values: if(type-of($values) != list, ($values,), $values);
+
+  $val: "";
+
+  // Loop over each value and calculate value
+  @each $value in $values {
+    @if $value == 0 {
+      $val: $val + " 0";
     }
     @else {
-      @error "`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.";
+      // Cache $value unit
+      $unit: if(type-of($value) == "number", unit($value), false);
+
+      @if $unit == px {
+        // Convert to rem if needed
+        $val: $val + " " + if($rfs-unit == rem, #{divide($value, $value * 0 + $rfs-rem-value)}rem, $value);
+      }
+      @else if $unit == rem {
+        // Convert to px if needed
+        $val: $val + " " + if($rfs-unit == px, #{divide($value, $value * 0 + 1) * $rfs-rem-value}px, $value);
+      } @else {
+        // If $value isn't a number (like inherit) or $value has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
+        $val: $val + " " + $value;
+      }
     }
+  }
+
+  // Remove first space
+  @return unquote(str-slice($val, 2));
+}
 
-    // Only add media query if font-size is bigger as the minimum font-size
-    // If $rfs-factor == 1, no rescaling will take place
-    @if $fs > $rfs-base-font-size and $enable-responsive-font-sizes {
-      $min-width: null;
-      $variable-unit: null;
+// Helper function to get the responsive value calculated by RFS
+@function rfs-fluid-value($values) {
+  // Convert to list
+  $values: if(type-of($values) != list, ($values,), $values);
+
+  $val: "";
+
+  // Loop over each value and calculate value
+  @each $value in $values {
+    @if $value == 0 {
+      $val: $val + " 0";
+    } @else {
+      // Cache $value unit
+      $unit: if(type-of($value) == "number", unit($value), false);
+
+      // If $value isn't a number (like inherit) or $value has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
+      @if not $unit or $unit != px and $unit != rem {
+        $val: $val + " " + $value;
+      } @else {
+        // Remove unit from $value for calculations
+        $value: divide($value, $value * 0 + if($unit == px, 1, divide(1, $rfs-rem-value)));
+
+        // Only add the media query if the value is greater than the minimum value
+        @if abs($value) <= $rfs-base-value or not $enable-rfs {
+          $val: $val + " " + if($rfs-unit == rem, #{divide($value, $rfs-rem-value)}rem, #{$value}px);
+        }
+        @else {
+          // Calculate the minimum value
+          $value-min: $rfs-base-value + divide(abs($value) - $rfs-base-value, $rfs-factor);
 
-      // Calculate minimum font-size for given font-size
-      $fs-min: $rfs-base-font-size + math.div($fs - $rfs-base-font-size, $rfs-factor);
+          // Calculate difference between $value and the minimum value
+          $value-diff: abs($value) - $value-min;
 
-      // Calculate difference between given font-size and minimum font-size for given font-size
-      $fs-diff: $fs - $fs-min;
+          // Base value formatting
+          $min-width: if($rfs-unit == rem, #{divide($value-min, $rfs-rem-value)}rem, #{$value-min}px);
 
-      // Base font-size formatting
-      // No need to check if the unit is valid, because we did that before
-      $min-width: if($rfs-font-size-unit == rem, #{math.div($fs-min, $rfs-rem-value)}rem, #{$fs-min}px);
+          // Use negative value if needed
+          $min-width: if($value < 0, -$min-width, $min-width);
 
-      // If two-dimensional, use smallest of screen width and height
-      $variable-unit: if($rfs-two-dimensional, vmin, vw);
+          // Use `vmin` if two-dimensional is enabled
+          $variable-unit: if($rfs-two-dimensional, vmin, vw);
 
-      // Calculate the variable width between 0 and $rfs-breakpoint
-      $variable-width: #{math.div($fs-diff * 100, $rfs-breakpoint)}#{$variable-unit};
+          // Calculate the variable width between 0 and $rfs-breakpoint
+          $variable-width: #{divide($value-diff * 100, $rfs-breakpoint)}#{$variable-unit};
 
-      // Set the calculated font-size.
-      $rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};
+          // Return the calculated value
+          $val: $val + " calc(" + $min-width + if($value < 0, " - ", " + ") + $variable-width + ")";
+        }
+      }
     }
+  }
+
+  // Remove first space
+  @return unquote(str-slice($val, 2));
+}
+
+// RFS mixin
+@mixin rfs($values, $property: font-size) {
+  @if $values != null {
+    $val: rfs-value($values);
+    $fluid-val: rfs-fluid-value($values);
 
-    // Rendering
-    @if $rfs-fluid == null {
-      // Only render static font-size if no fluid font-size is available
-      font-size: $rfs-static;
+    // Do not print the media query if responsive & non-responsive values are the same
+    @if $val == $fluid-val {
+      #{$property}: $val;
     }
     @else {
-      $mq-value: null;
-
-      // RFS breakpoint formatting
-      @if $rfs-breakpoint-unit == em or $rfs-breakpoint-unit == rem {
-        $mq-value: #{math.div($rfs-breakpoint, $rfs-rem-value)}#{$rfs-breakpoint-unit};
-      }
-      @else if $rfs-breakpoint-unit == px {
-        $mq-value: #{$rfs-breakpoint}px;
-      }
-      @else {
-        @error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
-      }
+      @include _rfs-rule () {
+        #{$property}: if($rfs-mode == max-media-query, $val, $fluid-val);
 
-      @if $rfs-class == "disable" {
-        // Adding an extra class increases specificity,
-        // which prevents the media query to override the font size
-        &,
-        .disable-responsive-font-size &,
-        &.disable-responsive-font-size {
-          font-size: $rfs-static;
-        }
-      }
-      @else {
-        font-size: $rfs-static;
+        // Include safari iframe resize fix if needed
+        min-width: if($rfs-safari-iframe-resize-bug-fix, (0 * 1vw), null);
       }
 
-      @if $rfs-two-dimensional {
-        @media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
-          @if $rfs-class == "enable" {
-            .enable-responsive-font-size &,
-            &.enable-responsive-font-size {
-              font-size: $rfs-fluid;
-            }
-          }
-          @else {
-            font-size: $rfs-fluid;
-          }
-
-          @if $rfs-safari-iframe-resize-bug-fix {
-            // stylelint-disable-next-line length-zero-no-unit
-            min-width: 0vw;
-          }
-        }
-      }
-      @else {
-        @media (max-width: #{$mq-value}) {
-          @if $rfs-class == "enable" {
-            .enable-responsive-font-size &,
-            &.enable-responsive-font-size {
-              font-size: $rfs-fluid;
-            }
-          }
-          @else {
-            font-size: $rfs-fluid;
-          }
-
-          @if $rfs-safari-iframe-resize-bug-fix {
-            // stylelint-disable-next-line length-zero-no-unit
-            min-width: 0vw;
-          }
-        }
+      @include _rfs-media-query-rule () {
+        #{$property}: if($rfs-mode == max-media-query, $fluid-val, $val);
       }
     }
   }
 }
 
-// The font-size & responsive-font-size mixin uses RFS to rescale font sizes
-@mixin font-size($fs, $important: false) {
-  @include rfs($fs, $important);
+// Shorthand helper mixins
+@mixin font-size($value) {
+  @include rfs($value);
+}
+
+@mixin padding($value) {
+  @include rfs($value, padding);
+}
+
+@mixin padding-top($value) {
+  @include rfs($value, padding-top);
+}
+
+@mixin padding-right($value) {
+  @include rfs($value, padding-right);
+}
+
+@mixin padding-bottom($value) {
+  @include rfs($value, padding-bottom);
+}
+
+@mixin padding-left($value) {
+  @include rfs($value, padding-left);
+}
+
+@mixin margin($value) {
+  @include rfs($value, margin);
+}
+
+@mixin margin-top($value) {
+  @include rfs($value, margin-top);
+}
+
+@mixin margin-right($value) {
+  @include rfs($value, margin-right);
+}
+
+@mixin margin-bottom($value) {
+  @include rfs($value, margin-bottom);
 }
 
-@mixin responsive-font-size($fs, $important: false) {
-  @include rfs($fs, $important);
+@mixin margin-left($value) {
+  @include rfs($value, margin-left);
 }
diff --git a/assets/css/style.scss b/assets/css/style.scss
index f88f39ab29..f100e73c69 100644
--- a/assets/css/style.scss
+++ b/assets/css/style.scss
@@ -26,11 +26,57 @@ $footer-text-color: $white;
 $sub-footer-background-color: darken($primary, 10%);
 $sub-footer-text-color: $white;
 
-// Bootstrap
+// Bootstrap 5.3.2
+
+// 1. Include Bootstrap functions first
+@import "bootstrap/functions";
+
+// 2. Include our variable overrides here
 @import "bootstrap-variables";
-@import "bootstrap/bootstrap-reboot";
-@import "bootstrap/bootstrap-grid";
-// @import 'bootstrap/bootstrap'; // Uncomment this line to import the entire Bootstrap library
+
+// 3. Include main bootstrap variables and functions
+@import "bootstrap/variables";
+@import "bootstrap/variables-dark";
+@import "bootstrap/maps";
+@import "bootstrap/mixins";
+@import "bootstrap/utilities";
+
+// 4. Include optional Bootstrap components
+@import "bootstrap/root";
+@import "bootstrap/reboot";
+@import "bootstrap/type";
+@import "bootstrap/images";
+@import "bootstrap/containers";
+@import "bootstrap/grid";
+@import "bootstrap/tables";
+@import "bootstrap/forms";
+// @import "bootstrap/buttons";
+// @import "bootstrap/transitions";
+// @import "bootstrap/dropdown";
+// @import "bootstrap/button-group";
+// @import "bootstrap/nav";
+// @import "bootstrap/navbar";
+// @import "bootstrap/card";
+// @import "bootstrap/accordion";
+// @import "bootstrap/breadcrumb";
+// @import "bootstrap/pagination";
+// @import "bootstrap/badge";
+// @import "bootstrap/alert";
+// @import "bootstrap/progress";
+// @import "bootstrap/list-group";
+// @import "bootstrap/close";
+// @import "bootstrap/toasts";
+// @import "bootstrap/modal";
+// @import "bootstrap/tooltip";
+// @import "bootstrap/popover";
+// @import "bootstrap/carousel";
+// @import "bootstrap/spinners";
+// @import "bootstrap/offcanvas";
+// @import "bootstrap/placeholders";
+
+// 5. Include Bootstrap helpers and utilities
+@import "bootstrap/helpers";
+@import "bootstrap/utilities/api";
 
 // Libraries
 @import "libraries/hamburgers/hamburgers";
diff --git a/netlify.toml b/netlify.toml
index 1e8f19da06..12954c1fec 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -3,4 +3,5 @@
   publish = "_site"
 
 [build.environment]
-  JEKYLL_ENV = "production"
\ No newline at end of file
+  JEKYLL_ENV = "production"
+  RUBY_VERSION = "3.2.2"
\ No newline at end of file