/* ========== 全站共用变量（原样保留） ========== */
        :root {
            --primary-blue: #0b2545;
            --accent-blue: #134074;
            --light-blue: #8da9c4;
            --dark-charcoal: #1d2d44;
            --pure-white: #ffffff;
            --border-color: #e2e8f0;
            --text-main: #334155;
            --alert-red: #d9383a;
            --bg-light: #f8fafc;
        }

        /* ========== 全局基础重置（原样保留） ========== */
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--pure-white);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* ========== 全局容器（原样保留） ========== */
        .container {
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ========== 顶部信息条 top-bar 样式 (原样保留) ========== */
        .top-bar {
            background-color: var(--primary-blue);
            color: var(--pure-white);
            font-size: 14px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .top-bar-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* ========== Header 导航 PC端基础样式 (原样保留) ========== */
        header {
            background: var(--pure-white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
        }
        .header-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            max-width: 100%;
            padding: 0 12%;
            margin: 0 auto;
            background: #fff;
        }
        .logo-area img {
            height: 55px;
            object-fit: contain;
        }
        nav ul {
            list-style: none;
            display: flex;
            gap: 20px;
        }
        nav ul li a {
            font-size: 16px;
            font-weight: 600;
            color: var(--dark-charcoal);
            padding: 8px 4px;
            letter-spacing: 0.5px;
        }
        nav ul li a:hover, nav ul li a.active {
    color: #3399ff;
    background-color: #e6f5ff;
    border-bottom: 4px solid #3399ff;
}

        .menu-toggle {
            display: none;
            font-size: 28px;
            cursor: pointer;
            color: var(--dark-charcoal);
            padding: 8px;
            flex-shrink: 0;
        }

        /* ========== 新增：页面主体内容定制样式 (SEO与B2B转化导向) ========== */
        main { padding-bottom: 60px; }

        /* 面包屑导航 */
        .breadcrumbs {
            padding: 20px 0;
            font-size: 14px;
            color: #64748b;
        }
        .breadcrumbs a {
            color: var(--accent-blue);
            font-weight: 500;
        }
        .breadcrumbs a:hover { text-decoration: underline; }
        .breadcrumbs span.separator { margin: 0 8px; }

        /* 头部介绍区域 */
        .category-header {
            text-align: center;
            padding: 30px 0 50px;
        }
        .category-header h1 {
            font-size: 36px;
            color: var(--primary-blue);
            margin-bottom: 15px;
            font-weight: 700;
        }
        .category-header p {
            max-width: 800px;
            margin: 0 auto;
            color: #475569;
            font-size: 16px;
        }

        /* 快捷分类筛选 */
        .subcategory-nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 50px;
        }
        .subcategory-nav a {
            display: inline-block;
            padding: 10px 25px;
            border: 1px solid var(--border-color);
            border-radius: 30px;
            font-weight: 600;
            color: var(--text-main);
            background: var(--bg-light);
        }
        .subcategory-nav a:hover, .subcategory-nav a.active {
            background: var(--accent-blue);
            color: var(--pure-white);
            border-color: var(--accent-blue);
        }

        /* 产品网格 (B2B 询盘导向) */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-bottom: 50px;
        }
        .product-card {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            background: var(--pure-white);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .product-card > a {
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        }
        .product-img-wrap {
            position: relative;
            aspect-ratio: 4/3;
            background: #f1f5f9;
            overflow: hidden;
        }
        .product-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img-wrap img {
            transform: scale(1.05);
        }
        .promo-badge {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--alert-red);
            color: #fff;
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 600;
            border-radius: 4px;
            text-transform: uppercase;
        }
        .product-info {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .product-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark-charcoal);
            margin-bottom: 20px;
            line-height: 1.4;
        }
        /* 已移除 .product-specs 相关样式，不再使用 */
        .btn-inquire {
            display: block;
            text-align: center;
            background: var(--pure-white);
            color: var(--accent-blue);
            border: 2px solid var(--accent-blue);
            padding: 10px 0;
            border-radius: 4px;
            font-weight: 600;
            text-transform: uppercase;
            margin-top: auto;
        }
        .product-card:hover .btn-inquire {
            background: var(--accent-blue);
            color: var(--pure-white);
        }

        /* 分页 */
        /* 哪怕 wrap 没写样式，只要下面的选择器带上 ul.pagination 就能完美生效 */
        ul.pagination {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin: 40px 0 80px;
            padding: 0;
            list-style: none;
        }
        ul.pagination li a, 
        ul.pagination li span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 40px;
            height: 40px;
            padding: 0 8px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-weight: 600;
            text-decoration: none;
            color: inherit;
        }
        ul.pagination li a:hover { 
            background: var(--bg-light); 
            border-color: var(--accent-blue); 
            color: var(--accent-blue); 
        }
        ul.pagination li.active a, 
        ul.pagination li span.current { 
            background: var(--accent-blue); 
            color: #fff !important; 
            border-color: var(--accent-blue); 
            cursor: default;
        }
        /* 采购指南 & SEO 文本 */
        .seo-content-section {
            background: var(--bg-light);
            padding: 60px 0;
            border-radius: 12px;
            margin-bottom: 60px;
        }
        .seo-content-wrap {
            max-width: 900px;
            margin: 0 auto;
        }
        .seo-content-wrap h2 {
            font-size: 28px;
            color: var(--primary-blue);
            margin-bottom: 25px;
            text-align: center;
        }
        .seo-content-wrap h3 {
            font-size: 20px;
            color: var(--dark-charcoal);
            margin: 20px 0 10px;
        }
        .seo-content-wrap p {
            margin-bottom: 15px;
            color: #475569;
        }

        /* FAQ 问答区域 (纯HTML/CSS实现) */
        .faq-section {
            max-width: 900px;
            margin: 0 auto 80px;
        }
        .faq-section h2 {
            text-align: center;
            font-size: 28px;
            color: var(--primary-blue);
            margin-bottom: 30px;
        }
        details.faq-item {
            background: var(--pure-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
        }
        details.faq-item summary {
            padding: 18px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--dark-charcoal);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        details.faq-item summary::-webkit-details-marker { display: none; }
        details.faq-item summary::after {
            content: '+';
            font-size: 24px;
            color: var(--accent-blue);
            transition: transform 0.3s;
        }
        details.faq-item[open] summary::after { transform: rotate(45deg); }
        details.faq-item p {
            padding: 0 20px 20px;
            color: #475569;
            border-top: 1px solid var(--border-color);
            margin-top: 15px;
            padding-top: 15px;
        }

        /* 信任背书与评分 */
        .trust-section {
            text-align: center;
            padding: 40px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 60px;
            background: url('data:image/svg+xml;utf8,<svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg"><circle cx="2" cy="2" r="2" fill="%23f1f5f9"/></svg>');
        }
        .trust-stars {
            color: #fbbf24;
            font-size: 24px;
            letter-spacing: 5px;
            margin-bottom: 15px;
        }
        .trust-text {
            font-size: 18px;
            font-weight: 600;
            color: var(--dark-charcoal);
            margin-bottom: 10px;
        }
        .trust-subtext { font-size: 14px; color: #64748b; }

        /* ========== footer 样式 (原样保留) ========== */
        footer {
            background-color: #2c2f38;
            color: #e2e8f0;
            padding: 50px 0 30px;
        }
        .footer-row {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 35px;
        }
        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap:14px;
            margin-bottom:22px;
        }
        .footer-contact-icon {
            width:50px;
            height:50px;
            border-radius:50%;
            background:#444750;
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
            font-size:24px;
        }
        .footer-col h5 {
            font-size:22px;
            margin-bottom:20px;
            font-weight:600;
            color:#fff;
        }
        .footer-col ul {
            list-style:none;
        }
        .footer-col ul li {
            margin-bottom:10px;
            font-size:16px;
        }
        .footer-col ul li a:hover {
            color:#8da9c4;
        }
        .footer-bottom-text {
            text-align:center;
            padding-top:25px;
            border-top:1px solid #444750;
            font-size:17px;
            color:#b0b8c4;
        }
        .footer-contact-text a{
            font-size:20px;
            font-weight:500;
            color:#fff;
        }

        /* ========== 响应式适配 ========== */
        @media(max-width: 1200px) {
            .product-grid { grid-template-columns: repeat(3, 1fr); }
            .footer-row { grid-template-columns: repeat(3, 1fr); gap: 25px; }
        }
        @media(max-width: 992px) {
            .product-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media(max-width: 768px) {
            .container { padding: 0 20px; }
            .header-flex {
                display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 30px;
            max-width: 1440px;
            margin: 0 auto;
            }
            .menu-toggle { display: block; order: 2; }
            .logo-area { order: 1; }
            header nav {
                width: 100%;
                position: absolute;
                left: 0;
                top: 100%;
                background: #fff;
                box-shadow: 0 8px 15px rgba(0,0,0,0.08);
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.35s ease;
                order: 3;
            }
            header nav.open { max-height: 600px; }
            nav ul {
                flex-direction: column;
                padding: 15px 20px;
                gap: 8px !important;
            }
            nav ul li a { display: block; padding: 10px 0; text-align: center; }
            nav ul li a:hover, nav ul li a.active {
                color: #3399ff;
                background-color: #e6f5ff;
                border-bottom: 4px solid #3399ff;
            }
            .top-bar-flex { flex-direction: column; text-align: center; gap: 15px; }
            
            .product-grid { grid-template-columns: 1fr; gap: 20px; }
            .footer-row { grid-template-columns: 1fr; }
            .category-header h1 { font-size: 28px; }
            .subcategory-nav a { padding: 8px 16px; font-size: 14px; }
        }