* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --primary: #4a6fa5;
            --primary-dark: #3a5a8c;
            --primary-light: #eef3fc;
            --accent: #c9a03d;
            --accent-light: #fef6e6;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --bg-soft: #f9fbfd;
            --text-dark: #1f2a44;
            --text-mid: #4a5b7a;
            --text-light: #8a9bb5;
            --border: #e9edf4;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.03);
            --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.04);
            --radius-lg: 28px;
            --radius-md: 20px;
            --radius-sm: 14px;
        }
        body { font-family: 'Inter', sans-serif; background: var(--bg-body); color: var(--text-dark); line-height: 1.5; }
        .fa-facebook { color: #1877f2; }
        .fa-tiktok { color: #000000; }
        .fa-twitter { color: #1DA1F2; }
        .fa-instagram { color: #E4405F; }
        .fa-telegram { color: #26A5E4; }
        .top-bar {
            background: var(--primary-dark);
            color: white;
            padding: 8px 20px;
            text-align: center;
            font-size: 13px;
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
        }
        .navbar {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .nav-container {
            max-width: 1600px;
            margin: 0 auto;
            padding: 12px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
        .logo-icon { font-size: 30px; }
        .logo-text { font-size: 24px; font-weight: 800; background: linear-gradient(135deg, var(--primary-dark), var(--primary)); -webkit-background-clip: text; background-clip: text; color: transparent; }
        .nav-links { display: flex; gap: 28px; align-items: center; }
        .nav-links a { text-decoration: none; color: var(--text-mid); font-weight: 500; transition: 0.2s; font-size: 15px; }
        .nav-links a:hover { color: var(--primary); }
        .order-query { background: var(--primary-light); padding: 6px 18px; border-radius: 40px; color: var(--primary-dark) !important; }
        .cart-icon { background: white; width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center; border-radius: 40px; box-shadow: var(--shadow-sm); font-size: 18px; }
        @media (max-width: 768px) { .nav-container { flex-direction: column; padding: 12px 20px; } .nav-links { gap: 18px; flex-wrap: wrap; justify-content: center; } }
        
        .main-layout { max-width: 1600px; margin: 32px auto; padding: 0 28px; display: flex; gap: 32px; }
        /* 侧边栏新样式 - 支持二级导航 */
        .sidebar { width: 300px; flex-shrink: 0; background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); height: fit-content; position: sticky; top: 100px; overflow: hidden; }
        .sidebar-header { padding: 20px 24px; border-bottom: 1px solid var(--border); font-weight: 700; font-size: 18px; background: var(--bg-soft); color: var(--primary-dark); }
        .category-list { list-style: none; /* max-height: 70vh; */ overflow-y: auto; padding: 8px 0; }
        .category-list::-webkit-scrollbar { width: 4px; }
        .cat-main-item { transition: 0.2s; }
        .cat-main-item.active-cat > .cat-primary { background: linear-gradient(90deg, var(--primary-light) 0%, transparent 100%); border-left: 3px solid var(--primary); }
        .cat-primary { display: flex; align-items: center; justify-content: space-between; padding: 12px 20px 12px 24px; cursor: pointer; transition: 0.2s; }
        .cat-primary:hover { background: var(--primary-light); }
        .cat-name { display: flex; align-items: center; gap: 12px; font-weight: 500; flex: 1; }
        .cat-name i { font-size: 1.2rem; width: 1.4em; text-align: center; }
        .cat-count { font-size: 12px; background: #eef2f8; padding: 2px 10px; border-radius: 30px; color: var(--text-mid); }
        .toggle-sub-btn { background: none; border: none; font-size: 14px; color: var(--text-mid); cursor: pointer; width: 28px; height: 28px; border-radius: 30px; display: inline-flex; align-items: center; justify-content: center; transition: 0.2s; }
        .toggle-sub-btn:hover { background: rgba(0,0,0,0.05); color: var(--primary); }
        .subcategory-list { list-style: none; padding-left: 48px; background: #fdfdfe; border-top: 1px solid var(--border); display: none; }
        .subcategory-list.open { display: block; }
        .sub-cat-item { padding: 10px 16px; cursor: pointer; font-size: 14px; color: var(--text-mid); display: flex; justify-content: space-between; align-items: center; transition: 0.2s; border-left: 2px solid transparent; }
        .sub-cat-item:hover { background: var(--primary-light); color: var(--primary-dark); }
        .sub-cat-item.active-sub { background: #e9f0fe; border-left-color: var(--primary); color: var(--primary-dark); font-weight: 500; }
        .sub-count { font-size: 11px; background: #e9edf2; padding: 2px 8px; border-radius: 30px; }
        @media (max-width: 900px) {
            .main-layout { flex-direction: column; }
            .sidebar { width: 100%; position: static; background: var(--bg-card); border-radius: var(--radius-lg); margin-bottom: 16px; }
            .category-list { display: block; max-height: none; overflow-y: visible; }
            .subcategory-list { padding-left: 40px; }
        }
        .content-area { flex: 1; min-width: 0; }
        .notice-card { background: var(--accent-light); border-radius: var(--radius-md); padding: 20px 24px; margin-bottom: 28px; border: 1px solid rgba(201, 160, 61, 0.3); box-shadow: var(--shadow-sm); }
        .notice-title { font-size: 18px; font-weight: 700; color: var(--accent); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; border-bottom: 1px dashed rgba(201, 160, 61, 0.4); padding-bottom: 10px; }
        .product-panel { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); box-shadow: var(--shadow-sm); overflow: hidden; margin-bottom: 32px; }
        .product-header { padding: 20px 28px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; background: var(--bg-soft); }
        .product-header h2 { font-size: 22px; font-weight: 700; color: var(--primary-dark); }
        .product-stats { font-size: 13px; background: #eef2f8; padding: 5px 14px; border-radius: 40px; color: var(--text-mid); }
        .quick-cat-links { display: flex; flex-wrap: wrap; gap: 12px; padding: 12px 28px; background: var(--bg-soft); border-bottom: 1px solid var(--border); }
        .quick-cat-link { padding: 6px 20px; font-size: 13px; font-weight: 500; background: var(--bg-card); border: 1px solid var(--border); border-radius: 60px; text-decoration: none; color: var(--text-mid); transition: 0.2s; }
        .quick-cat-link:hover { background: var(--primary-light); border-color: var(--primary); color: var(--primary-dark); }
        /* .product-list { max-height: 580px; overflow-y: auto; } */
        .product-row { display: flex; align-items: center; justify-content: space-between; padding: 18px 28px; border-bottom: 1px solid var(--border); transition: 0.2s; gap: 16px; flex-wrap: wrap; }
        .product-row:hover { background: var(--primary-light); }
        .product-info { flex: 2; min-width: 180px; }
        .product-title { font-weight: 700; font-size: 16px; }
        .product-sub { font-size: 12px; color: var(--text-light); margin-top: 4px; }
        .product-meta { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
        .price { font-size: 22px; font-weight: 800; color: var(--primary-dark); }
        .stock { font-size: 13px; background: var(--primary-light); padding: 4px 14px; border-radius: 60px; }
        .buy-btn { background: var(--primary); border: none; padding: 10px 28px; border-radius: 60px; color: white; font-weight: 700; cursor: pointer; transition: 0.2s; font-size: 14px; box-shadow: 0 2px 6px rgba(74,111,165,0.3); }
        .buy-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }
        .process-section { background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border); padding: 24px 28px; margin-bottom: 32px; }
        .steps { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
        .step-item { flex: 1; text-align: center; min-width: 140px; padding: 16px 12px; background: var(--bg-soft); border-radius: var(--radius-sm); }
        .step-number { width: 44px; height: 44px; background: var(--primary); color: white; display: inline-flex; align-items: center; justify-content: center; border-radius: 60px; font-weight: 800; font-size: 20px; margin-bottom: 14px; }
        .articles-section { margin-top: 8px; }
        .section-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 24px; }
        .section-head h3 { font-size: 22px; font-weight: 700; color: var(--primary-dark); }
        .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .article-card { background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border); padding: 22px; transition: 0.25s; }
        .article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .article-title { font-weight: 700; font-size: 17px; margin-bottom: 12px; }
        .pagination { display: flex; justify-content: center; gap: 12px; margin-top: 32px; }
        .page-btn { background: white; border: 1px solid var(--border); padding: 7px 16px; border-radius: 40px; cursor: pointer; font-size: 13px; }
        .page-btn.active { background: var(--primary); border-color: var(--primary); color: white; }
        .floating-cart { position: fixed; bottom: 28px; right: 28px; background: var(--primary); width: 56px; height: 56px; border-radius: 56px; display: flex; align-items: center; justify-content: center; color: white; font-size: 24px; box-shadow: 0 8px 20px rgba(74,111,165,0.4); cursor: pointer; z-index: 99; }
        .cart-badge { position: absolute; top: -5px; right: -5px; background: var(--accent); width: 22px; height: 22px; border-radius: 22px; font-size: 11px; display: flex; align-items: center; justify-content: center; }
        .footer { background: #1e2a3e; color: #a0b3d9; padding: 48px 28px 28px; margin-top: 32px; }
        .footer-inner { max-width: 1600px; margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 32px; }
        .footer-bottom { text-align: center; margin-top: 40px; padding-top: 20px; border-top: 1px solid #2d3b4f; font-size: 12px; }
        .empty-state { text-align: center; padding: 60px; color: var(--text-light); }
        .friend-link-wrapper { max-width: 1600px; margin: 0 auto 32px auto; padding: 0 28px; }
        .friend-link-card { background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border); padding: 20px 28px; }
        @media (max-width: 900px) { .article-grid { grid-template-columns: 1fr; } .product-row { flex-direction: column; align-items: stretch; } .buy-btn { width: 100%; text-align: center; } .steps { flex-direction: column; } .step-item { display: flex; align-items: center; gap: 20px; text-align: left; } .step-number { margin-bottom: 0; } }