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

        :root {
            --primary:#1677ff;
            --primary-dark:#0b5fd8;
            --light:#f0f7ff;
            --dark:#192233;
            --gray:#637282;
            --white:#ffffff;
            --bg:#f7f9fc;

            /* 一级分类：深底色 + 高对比选中色 */
            --cate1-normal: #e8edf5;    /* 一级常态：深灰蓝 */
            --cate1-active: #1677ff;    /* 一级选中/展开：主蓝色（深色底） */
            --cate1-hover: #d8e1f0;     /* 一级悬浮 */
            --cate1-text-normal: #222;  /* 一级常态文字 */
            --cate1-text-active: #fff; /* 一级选中文字（白色） */

            /* 二级分类：浅底色，和一级强烈区分 */
            --cate2-normal: #ffffff;    /* 二级常态：纯白 */
            --cate2-active: #cce0ff;    /* 二级选中：浅蓝 */
            --cate2-hover: #f0f6ff;     /* 二级悬浮 */
            --cate2-text-normal: #555;  /* 二级常态文字 */
            --cate2-text-active: #0052cc;/* 二级选中文字（深蓝） */
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        .container {
            width: 92%;
            max-width: 1320px;
            margin: 0 auto;
        }

        /*导航统一*/
        .header {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255,255,255,.95);
            box-shadow: 0 1px 12px rgba(0,0,0,0.08);
            z-index: 9999;
        }

        .nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 78px;
        }

        .logo {
            font-size: 26px;
            font-weight: 700;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

            .logo i {
                font-size: 30px;
            }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 42px;
        }

            .nav-menu a {
                font-size: 16px;
                font-weight: 500;
                padding: 8px 0;
                position: relative;
                transition: .3s;
                color: var(--dark);
            }

                .nav-menu a:hover, .nav-menu a.active {
                    color: var(--primary);
                }

                    .nav-menu a.active::after {
                        content: '';
                        position: absolute;
                        bottom: 0;
                        left: 0;
                        width: 100%;
                        height: 3px;
                        background: var(--primary);
                        border-radius: 3px;
                    }

        .mobile-btn {
            display: none;
            font-size: 26px;
            cursor: pointer;
        }

        /*页面顶部通栏banner*/
        .page-banner {
            margin-top: 78px;
            width: 100%;
            height: 320px;
            background: linear-gradient(rgba(12,78,170,0.75),rgba(12,78,170,0.75)),url('https://picsum.photos/id/1039/1920/1080');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            text-align: center;
        }

            .page-banner h1 {
                font-size: 42px;
                margin-bottom: 12px;
            }

            .page-banner p {
                font-size: 18px;
                opacity: 0.92;
            }

        /*面包屑导航*/
        .crumbs {
            padding: 18px 0;
            border-bottom: 1px solid #eee;
            font-size: 15px;
            color: var(--gray);
            background: #fff;
        }

            .crumbs a {
                color: var(--primary);
            }

        /*产品主体大间距大气布局 */
        .product-section {
            padding: 80px 0;
            background: var(--bg);
        }

        .product-wrap {
            display: grid;
            grid-template-columns: 240px 1fr;
            gap: 35px;
            align-items: flex-start;
        }

        /* 左侧分类栏样式 */
        .category-sidebar {
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 20px #e4ecf8;
            position: sticky;
            top: 110px;
        }

        .sidebar-header {
            background: var(--primary);
            color: #fff;
            font-size: 28px;
            font-weight: 600;
            padding: 32px 24px;
            border-bottom: 1px solid #ffffff; /* 新增1px白色分割线 */
        }

        .category-menu {
            list-style: none;
        }

        .category-item {
            border-bottom: 1px solid #f0f2f5;
        }

        /* 一级分类标题 */
        .category-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
            background-color: var(--cate1-normal);
            color: var(--cate1-text-normal);
        }
        .category-title:hover {
            background-color: var(--cate1-hover);
        }
        .category-title .left-icon {
            font-size: 18px;
            color: var(--primary);
            margin-right: 10px;
        }
        .category-title .arrow {
            font-size: 14px;
            color: var(--gray);
            transition: transform 0.3s;
        }
        /* 展开时箭头旋转向上 */
        .category-item.open .category-title .arrow {
            transform: rotate(180deg);
        }
        /* 一级选中/展开样式：深色背景+白色文字，强对比 */
        .category-title.active {
            color: var(--cate1-text-active);
            background-color: var(--cate1-active);
        }
        .category-title.active .left-icon,
        .category-title.active .arrow {
            color: #fff;
        }

        /* 二级分类容器 */
        .subcategory-list {
            list-style: none;
            background-color: var(--cate2-normal);
            overflow: hidden;
            transition: max-height 0.3s ease;
            max-height: 0;
        }
        .category-item.open .subcategory-list {
            max-height: 500px;
        }

        .subcategory-item {
            border-top: 1px solid #f1f5fa;
        }
        /* 二级分类链接 */
        .subcategory-link {
            display: block;
            padding: 16px 24px 16px 48px;
            font-size: 15px;
            transition: all 0.3s;
            background-color: var(--cate2-normal);
            color: var(--cate2-text-normal);
        }
        .subcategory-link:hover {
            color: var(--primary);
            background-color: var(--cate2-hover);
        }
        /* 二级选中样式 */
        .subcategory-link.active {
            color: var(--cate2-text-active);
            background-color: var(--cate2-active);
            font-weight: 500;
        }

        .sec-head {
            text-align: center;
            margin-bottom: 45px;
        }

            .sec-head h2 {
                font-size: 40px;
                color: var(--dark);
                margin-bottom: 18px;
                position: relative;
                padding-bottom: 20px;
                font-weight: 600;
            }

                .sec-head h2::after {
                    content: "";
                    width: 82px;
                    height: 4px;
                    background: var(--primary);
                    position: absolute;
                    left: 50%;
                    transform: translateX(-50%);
                    bottom: 0;
                    border-radius: 4px;
                }

            .sec-head p {
                max-width: 720px;
                margin: 0 auto;
                color: var(--gray);
                font-size: 17px;
                line-height: 1.8;
            }

        .pro-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit,minmax(335px,1fr));
            gap: 42px;
        }

        .pro-card {
            border-radius: 20px;
            overflow: hidden;
            background: #fff;
            box-shadow: 0 7px 32px #e1e9f7;
            transition: .38s;
        }

            .pro-card:hover {
                transform: translateY(-12px);
                box-shadow: 0 18px 46px #d0dceb;
            }

            .pro-card img {
                width: 100%;
                height: 270px;
                object-fit: cover;
                display: block;
            }

        .pro-info {
            padding: 32px;
        }

            .pro-info h3 {
                font-size: 21px;
                margin-bottom: 14px;
                color: var(--dark);
                transition: .3s;
                font-weight: 500;
            }

                .pro-info h3:hover {
                    color: var(--primary);
                }

            .pro-info p {
                color: var(--gray);
                font-size: 15px;
                line-height: 1.7;
                margin-bottom: 18px;
                min-height: 52px;
            }

        .tag span {
            font-size: 13px;
            padding: 4px 10px;
            background: var(--light);
            color: var(--primary);
            border-radius: 5px;
            margin-right: 8px;
            display: inline-block;
            margin-bottom: 8px;
        }

        .look-detail {
            display: inline-block;
            margin-top: 20px;
            color: var(--primary);
            font-weight: 500;
            font-size: 16px;
        }

        /*分页 */
        .page-box {
            text-align: center;
            margin-top: 75px;
        }

            .page-box a {
                display: inline-block;
                padding: 11px 20px;
                border: 1px solid #dde3ec;
                margin: 0 7px;
                border-radius: 8px;
                transition: .3s;
                font-size: 15px;
            }

                .page-box a.active {
                    background: var(--primary);
                    color: #fff;
                    border: 1px solid var(--primary);
                    box-shadow: 0 3px 10px rgba(22,119,255,0.2);
                }

                .page-box a:hover:not(.active) {
                    border-color: var(--primary);
                    color: var(--primary);
                }

        /*页脚 */
        .footer {
            background: #121b2b;
            color: #b1b9c5;
            padding: 75px 0 30px;
        }

        .footer-top {
            display: flex;
            flex-wrap: wrap;
            gap: 42px;
            margin-bottom: 50px;
        }

        .footer-col {
            flex: 1;
            min-width: 240px;
        }

            .footer-col h3 {
                color: #fff;
                font-size: 22px;
                margin-bottom: 28px;
                padding-bottom: 14px;
                border-bottom: 1px solid #2c3749;
            }

            .footer-col ul {
                list-style: none;
            }

            .footer-col li {
                margin-bottom: 14px;
                font-size: 15px;
            }

            .footer-col a:hover {
                color: var(--primary);
            }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #2c3749;
        }

        /*移动端 */
        @media(max-width:992px) {
            .product-wrap {
                grid-template-columns: 1fr;
            }

            .category-sidebar {
                position: static;
                margin-bottom: 30px;
            }
        }

        @media(max-width:768px) {
            .nav-menu {
                display: none;
            }

            .mobile-btn {
                display: block;
            }

            .page-banner {
                height: 280px;
            }

                .page-banner h1 {
                    font-size: 32px;
                }

            .pro-grid {
                grid-template-columns: 1fr;
            }
        }