body {
            font-family: Arial, sans-serif;
            max-width: 600px;
            margin: 50px auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .container {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        h1 {
            color: #333;
        }
        .form-group {
            margin-bottom: 15px;
        }
        label {
            display: block;
            margin-bottom: 5px;
            color: #333;
            font-weight: bold;
        }
        input {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            box-sizing: border-box;
            font-size: 14px;
        }
        button {
            padding: 10px 20px;
            background-color: #3498db;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
        }
        button:hover {
            background-color: #2980b9;
        }
        .error {
            color: #e74c3c;
            padding: 10px;
            background-color: #fadbd8;
            border: 1px solid #e74c3c;
            border-radius: 4px;
            margin-bottom: 15px;
        }
        .register-link {
            margin-top: 15px;
            text-align: center;
        }
        .register-link a {
            color: #3498db;
            text-decoration: none;
        }
        .register-link a:hover {
            text-decoration: underline;
        }
        
        .success {
            color: #27ae60;
            padding: 15px;
            background-color: #d5f4e6;
            border: 1px solid #27ae60;
            border-radius: 4px;
            margin-bottom: 15px;
        }
        .login-code {
            font-family: monospace;
            font-size: 18px;
            font-weight: bold;
            background-color: #ecf0f1;
            padding: 10px;
            border-radius: 4px;
            margin: 10px 0;
            word-break: break-all;
        }
        .login-link {
            margin-top: 15px;
            text-align: center;
        }
        .login-link a {
            color: #3498db;
            text-decoration: none;
        }
        .login-link a:hover {
            text-decoration: underline;
        }
        .note {
            color: #e74c3c;
            font-weight: bold;
            margin-top: 10px;
            padding: 10px;
            background-color: #ffebee;
            border-radius: 4px;
        }