.container_nav {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            gap: 30px;
        }
       
       /* 左侧导航 */
        .nav {
            width: 200px;
            flex-shrink: 0;
        }
        .nav-item {
            padding: 15px 20px;
            margin-bottom: 8px;
            background-color: #f5f5f5;
            border-left: 4px solid transparent;
            cursor: pointer;
            transition: all 0.3s;
        }
        .nav-item.active {
            background-color: #fff;
            border-left-color: #d9232e;
            color: #d9232e;
            font-weight: bold;
        }
        /* 右侧内容区 */
        .content {
            flex: 1;
        }
        .product-grid {
            display: none;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
        }
        .product-grid.active {
            display: grid;
        }
        .product-card {
            border: 1px solid #eee;
            border-radius: 4px;
            overflow: hidden;
            transition: box-shadow 0.3s;
        }
        .product-card:hover {
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .product-img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            background-color: #fafafa;
        }
        .product-name {
            padding: 15px;
            text-align: center;
            font-size: 14px;
            color: #333;
        }
        /* 分页 */
        .pagination {
            margin-top: 30px;
            text-align: center;
        }
        .page-btn {
            display: inline-block;
            width: 32px;
            height: 32px;
            line-height: 32px;
            text-align: center;
            border: 1px solid #ddd;
            margin: 0 4px;
            cursor: pointer;
        }
        .page-btn.active {
            background-color: #d9232e;
            color: #fff;
            border-color: #d9232e;
        }