public/captcha/captcha.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Enhanced CAPTCHA</title>
    <link rel="stylesheet" href="captcha.css">
</head>
<body>
    <div class="container">
        <header>CAPTCHA</header>
        <p>Select CAPTCHA type:</p>
        <select id="captchaType">
            <option value="text">Text</option>
            <option value="image">Image</option>
            <option value="audio">Audio</option>
            <option value="math">Math</option>
        </select>
        <div id="captchaContainer"></div>
        <div class="textcaptcha">
            <input type="text" placeholder="Enter CAPTCHA">
        </div>
        <button class="refresh">↻</button>
        <p class="result"></p>
        <div class="button">
            <button>Submit CAPTCHA</button>
        </div>
    </div>
    <script src="captcha.js"></script>
</body>
</html>