/* 导航样式 */
        .navbar {
            background: linear-gradient(to right, #2c3e50, #1a2a38);
            padding: 0 5%;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        
        .nav-container {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: center;
            padding: 15px 0;
        }
        
        .nav-item {
            margin: 0 25px;
        }
        
        .nav-link {
            color: #ecf0f1;
            text-decoration: none;
            font-size: 18px;
            font-weight: 600;
            padding: 10px 15px;
            border-radius: 4px;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .nav-link:hover {
            background: rgba(255,255,255,0.1);
        }
        
        .nav-link.active {
            background: rgba(255,255,255,0.15);
            color: #1abc9c;
        }
        
        
         
        @media (max-width: 900px) {
            .nav-item {
                margin: 0 15px;
            }
            
            .nav-link {
                font-size: 16px;
            }
            
            .page-title {
                font-size: 36px;
            }
        }
        
        @media (max-width: 768px) {
            .page-title {
                font-size: 32px;
            }
            
            .page-subtitle {
                font-size: 18px;
            }
            
            .product-grid {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            }
        }
        
        @media (max-width: 576px) {
            .nav-container {
                flex-wrap: wrap;
            }
            
            .nav-item {
                margin: 5px 10px;
            }
            
            .page-title {
                font-size: 28px;
            }
            
            .product-grid {
                grid-template-columns: 1fr;
            }
        }