* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, sans-serif;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        .registration-container {
            background: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 400px;
        }

        h2 {
            text-align: center;
            margin-bottom: 30px;
            color: #333;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 5px;
            color: #555;
            font-weight: bold;
        }

        input[type="text"],
        input[type="email"],
        input[type="password"] {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        input[type="text"]:focus,
        input[type="email"]:focus,
        input[type="password"]:focus {
            outline: none;
            border-color: #4CAF50;
        }

        .error-message {
            color: #ff4444;
            font-size: 14px;
            margin-top: 5px;
            display: none;
        }

        .submit-btn {
            width: 100%;
            padding: 12px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .submit-btn:hover {
            background-color: #45a049;
        }

        .submit-btn:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }

        .login-link {
            text-align: center;
            margin-top: 20px;
        }

        .login-link a {
            color: #4CAF50;
            text-decoration: none;
        }

        .login-link a:hover {
            text-decoration: underline;
        }

        .success-message {
            background-color: #d4edda;
            color: #155724;
            padding: 12px;
            border-radius: 5px;
            margin-bottom: 20px;
            display: none;
        }