Glassy Login & Register Panel from TheDoc

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login & Register Panel</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div id="login-panel" class="panel active">
            <h2>Login</h2>
            <form>
                <input type="text" placeholder="Username" required>
                <input type="password" placeholder="Password" required>
                <button type="submit">Login</button>
            </form>
            <p>No account yet? <a href="#" id="show-register">Register</a></p>
        </div>
        <div id="register-panel" class="panel">
            <h2>Register</h2>
            <form>
                <input type="text" placeholder="Username" required>
                <input type="email" placeholder="Email" required>
                <input type="password" placeholder="Password" required>
                <button type="submit">Register</button>
            </form>
            <p>Already have an account? <a href="#" id="show-login">Login</a></p>
        </div>
    </div>
    <script src="script.js"></script>
    <div class="hidden-doc">TheDoc</div>
</body>
</html>

CSS

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #232526 0%, #414345 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', Arial, sans-serif;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.panel {
    background: rgba(34, 40, 49, 0.6);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.18);
    padding: 2rem 2.5rem;
    min-width: 320px;
    margin: 1rem 0;
    display: none;
}

.panel.active {
    display: block;
}

h2 {
    color: #21e675;
    margin-bottom: 1.5rem;
    text-align: center;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input {
    padding: 0.75rem;
    border-radius: 8px;
    border: none;
    background: rgba(255,255,255,0.15);
    color: #fff;
    font-size: 1rem;
    outline: none;
}

input::placeholder {
    color: #bdbdbd;
}

button {
    padding: 0.75rem;
    border-radius: 8px;
    border: none;
    background: linear-gradient(90deg, #21e675 0%, #1b5e20 100%);
    color: #fff;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: linear-gradient(90deg, #1b5e20 0%, #21e675 100%);
}

p {
    color: #bdbdbd;
    text-align: center;
    margin-top: 1rem;
}

a {
    color: #21e675;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
}

a:hover {
    text-decoration: underline;
}

.hidden-doc {
    display: none;
}

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