* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }

        body {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .login-container {
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            width: 100%;
            max-width: 420px;
            padding: 40px 35px;
            transition: all 0.3s ease;
        }

        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .login-header h1 {
            color: #2c3e50;
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .login-header p {
            color: #7f8c8d;
            font-size: 16px;
        }

        .input-group {
            margin-bottom: 20px;
            position: relative;
        }

        .input-group label {
            display: block;
            margin-bottom: 8px;
            color: #34495e;
            font-weight: 500;
            font-size: 14px;
        }

        .input-group input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid #dcdfe6;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
            background-color: #f9fafb;
        }

        .input-group input:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }

        .captcha-container {
            display: flex;
            gap: 10px;
        }

        .captcha-container input {
            flex: 1;
        }

        .captcha-image {
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #f1f5f9;
            border-radius: 8px;
            padding: 0 15px;
            cursor: pointer;
            border: 1px solid #dcdfe6;
            transition: all 0.3s;
        }

        .captcha-image:hover {
            background-color: #e2e8f0;
        }

        .captcha-image span {
            font-family: 'Courier New', monospace;
            font-size: 20px;
            font-weight: bold;
            letter-spacing: 2px;
            color: #2c3e50;
            user-select: none;
        }

        .options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
        }

        .remember-me {
            display: flex;
            align-items: center;
        }

        .remember-me input {
            margin-right: 8px;
        }

        .forgot-password {
            color: #3498db;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.3s;
        }

        .forgot-password:hover {
            color: #2980b9;
            text-decoration: underline;
        }

        .login-button {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
        }

        .login-button:hover {
            background: linear-gradient(135deg, #2980b9, #2573a7);
            box-shadow: 0 6px 15px rgba(52, 152, 219, 0.4);
            transform: translateY(-2px);
        }

        .login-button:active {
            transform: translateY(0);
        }

        .register-link {
            text-align: center;
            margin-top: 25px;
            color: #7f8c8d;
            font-size: 14px;
        }

        .register-link a {
            color: #3498db;
            text-decoration: none;
            font-weight: 500;
        }

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

        .error-message {
            color: #e74c3c;
            font-size: 14px;
            margin-top: 5px;
            display: none;
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 30px 25px;
            }

            .options {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }

            .forgot-password {
                align-self: flex-end;
            }
        }