* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Arial, sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            min-height: 100vh;
        }
        
        /* 顶部配色区域 */
        .header {
            background: linear-gradient(135deg, #4a6fa5, #3a5985);
            color: white;
            padding: 20px 30px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        
        .header h1 {
            font-size: 24px;
            font-weight: 500;
        }
        
        /* 主要内容区域 */
        .main-content {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: calc(100vh - 80px);
            padding: 20px;
        }
        
        .login-container {
            width: 100%;
            max-width: 350px;
        }

        .options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
            font-size: 14px;
        }
        
        .remember-me {
            display: flex;
            align-items: center;
        }
        
        .remember-me input {
            margin-right: 8px;
        }
        
        .login-box {
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }
        
        .login-title {
            text-align: center;
            margin-bottom: 25px;
            color: #333;
            font-size: 20px;
            font-weight: 500;
        }

        .register-link {
            text-align: center;
            color: #666;
            margin-top: 10px;
        }
        
        .register-link a {
            color: #4a90e2;
            text-decoration: none;
            font-weight: 500;
        }
        
        .register-link a:hover {
            text-decoration: underline;
        }
        
        .input-group {
            margin-bottom: 20px;
        }
        
        .input-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-size: 14px;
        }
        
        .input-group input {
            width: 100%;
            padding: 10px 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 15px;
            transition: border-color 0.2s;
        }
        
        .input-group input:focus {
            border-color: #4a6fa5;
            outline: none;
            box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.1);
        }
        
        .login-btn {
            width: 100%;
            padding: 12px;
            background-color: #4a6fa5;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.2s;
            margin-top: 10px;
            text-align: center;
        }
        
        .login-btn:hover {
            background-color: #3a5985;
        }
        
        .login-btn:active {
            transform: translateY(1px);
        }
        
        .login-link {
            display: block;
            text-align: center;
            margin-top: 20px;
            color: #4a6fa5;
            font-size: 14px;
            text-decoration: none;
        }
        
        .login-link:hover {
            text-decoration: underline;
        }
        
        .register-btn:hover {
            background-color: #f0f5ff;
        }
        
        .error-message {
            color: #e74c3c;
            font-size: 13px;
            margin-top: 5px;
            display: none;
        }
        
        .success-message {
            background-color: #2ecc71;
            color: white;
            padding: 10px;
            border-radius: 4px;
            margin-bottom: 15px;
            text-align: center;
            font-size: 14px;
            display: none;
        }
        
        .loading {
            opacity: 0.7;
            cursor: not-allowed;
        }
        
        /* 响应式调整 */
        @media (max-width: 480px) {
            .header {
                padding: 15px 20px;
            }
            
            .header h1 {
                font-size: 20px;
            }
            
            .login-box {
                padding: 25px 20px;
            }
            
            .login-title {
                font-size: 18px;
            }
        }