:root{
      --primary:#0B3D91;
      --primary-dark:#082d6b;
      --ink:#172238;
      --muted:#6d7788;
      --line:#e5e9f0;
      --soft:#f4f7fb;
      --card:#ffffff;
      --accent:#d82d78;
      --shadow:0 16px 40px rgba(20,42,82,.09);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{height:36px;background:#102039;color:#dce5f4;font-size:12px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:20px}
    .topbar a{color:#dce5f4;transition:color .2s}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--primary);font-size:18px;font-weight:800;white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1;height:100%}
    .nav-list{height:100%;display:flex;align-items:center;gap:3px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative;height:100%;display:flex;align-items:center}
    .nav-link{display:flex;align-items:center;height:100%;padding:0 13px;font-size:14px;color:#344056;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;margin-left:8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 20px 42px rgba(15,35,70,.14);opacity:0;visibility:hidden;pointer-events:none;transition:all .2s ease}
    .mega-menu{width:720px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-10px;height:10px}
    .drop-title,.mega-title{margin:0 0 12px;color:var(--primary);font-size:14px;font-weight:800}
    .drop-list{display:grid;gap:8px}
    .drop-list a{display:block;color:#4c586d;font-size:13px;line-height:1.45}
    .drop-list a:hover{color:var(--primary)}
    .mega-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px}
    .mega-items{display:grid;grid-template-columns:1fr 1fr;gap:9px}
    .mega-card{display:flex;align-items:center;gap:8px;padding:8px;border:1px solid #edf0f5;border-radius:9px;min-width:0}
    .mega-card:hover{border-color:#b8c8e7;background:#f7faff}
    .mega-card img{width:29px;height:29px;object-fit:cover;border-radius:6px;flex:0 0 auto}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:12px;color:#26334a}
    .mega-card small{font-size:10px;color:#7b8493;margin-top:2px}
    .mega-footer{display:inline-block;margin-top:15px;color:var(--primary);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--primary)}
    .open-account{padding:8px 15px;background:var(--primary);border-radius:7px;color:#fff;font-size:13px;font-weight:700}
    .open-account:hover{background:var(--primary-dark)}
    .hamburger{display:none;width:40px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--primary);transition:.2s}
    .drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(7,19,39,.48);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:50;right:0;top:0;width:min(380px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:transform .28s ease;box-shadow:-12px 0 35px rgba(0,0,0,.15);overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:70px;padding:0 20px;display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--line);font-weight:800;color:var(--primary)}
    .drawer-head>a{margin-left:auto;color:var(--primary);font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:30px;line-height:1;color:#657086;cursor:pointer}
    .drawer-menu{padding:15px 20px 30px}
    .drawer-link,.drawer-toggle{width:100%;display:block;padding:14px 2px;border:0;border-bottom:1px solid #eef1f5;background:transparent;text-align:left;color:#26334a;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:20px;line-height:1}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:7px 0 7px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:#69758a;font-size:13px}
    .footer{margin-top:70px;background:#111d31;color:#b8c4d7}
    .footer-grid{display:grid;grid-template-columns:1.4fr .9fr .9fr 1fr;gap:38px;padding:48px 0 35px}
    .footer-brand strong{display:block;color:#fff;font-size:19px;margin-bottom:12px}
    .footer p{margin:7px 0;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#b8c4d7;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);padding:18px 0;font-size:12px;color:#8796ae}
    .product-page{padding:36px 0 0}
    .breadcrumb{display:flex;align-items:center;gap:8px;color:#7b8698;font-size:13px;margin-bottom:22px}
    .breadcrumb a:hover{color:var(--primary)}
    .product-hero-card{display:grid;grid-template-columns:minmax(260px,390px) 1fr;gap:42px;padding:34px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
    .product-cover{min-height:280px;display:flex;align-items:center;justify-content:center;padding:25px;border-radius:15px;background:linear-gradient(145deg,#eef4ff,#f9fbff);border:1px solid #dfe8f8}
    .product-cover img{max-height:310px;object-fit:contain}
    .product-info .eyebrow{display:inline-block;margin-bottom:10px;color:var(--accent);font-size:12px;font-weight:800;letter-spacing:.08em}
    .product-info h1{margin:0 0 13px;color:#142442;font-size:clamp(27px,4vw,42px);line-height:1.2}
    .product-summary{margin:0 0 22px;color:#667287;font-size:16px}
    .product-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin:0 0 26px;padding:17px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:#718096;font-size:13px}
    .product-meta strong{color:#263750;font-size:15px}
    .product-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
    .primary-btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 22px;border-radius:8px;background:var(--primary);color:#fff;font-size:14px;font-weight:700}
    .primary-btn:hover{background:var(--primary-dark)}
    .outline-btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border:1px solid #c5d1e5;border-radius:8px;color:var(--primary);font-size:14px;font-weight:700}
    .outline-btn:hover{background:#f0f5ff}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;margin-top:30px;align-items:start}
    .product-content,.related-products{background:#fff;border:1px solid var(--line);border-radius:16px}
    .product-content{padding:32px;min-width:0;max-width:100%;overflow:hidden}
    .content-heading{display:flex;align-items:center;gap:12px;margin:0 0 22px;padding-bottom:14px;border-bottom:1px solid var(--line);font-size:21px;color:#172b4d}
    .content-heading:before{content:"";width:4px;height:22px;background:var(--accent);border-radius:4px}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;color:#4d596d;font-size:15px}
    .product-body img,.product-body video{max-width:100%;height:auto}
    .product-body table{max-width:100%;border-collapse:collapse}
    .product-body td,.product-body th{padding:8px 12px;border:1px solid var(--line)}
    .product-body h2,.product-body h3{color:#20365d}
    .related-products{padding:21px}
    .related-products h2{margin:0 0 15px;font-size:18px;color:#1d3153}
    .related-item{display:flex;gap:10px;padding:13px 0;border-bottom:1px solid #edf0f5}
    .related-item:last-child{border-bottom:0}
    .related-item img{width:62px;height:62px;border-radius:9px;object-fit:cover;background:#f2f5fa;flex:0 0 auto}
    .related-item strong{display:block;color:#2a3b58;font-size:13px;line-height:1.4}
    .related-item span{display:block;margin-top:4px;color:#8993a4;font-size:12px;line-height:1.45}
    .related-item:hover strong{color:var(--primary)}
    @media(max-width:1050px){
      .header-inner{gap:14px}
      .logo{min-width:160px}
      .nav-link{padding:0 8px;font-size:13px}
      .mega-menu{width:650px}
    }
    @media(max-width:820px){
      .topbar .container{font-size:11px}
      .topbar-links{gap:10px}
      .main-nav{display:none}
      .hamburger{display:block}
      .member-link{display:none}
      .product-hero-card{grid-template-columns:1fr;gap:24px}
      .product-cover{min-height:220px}
      .product-layout{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}
      .topbar{height:auto;min-height:36px;padding:7px 0}
      .topbar .container{align-items:flex-start;gap:6px;flex-direction:column}
      .header-inner{height:66px}
      .logo{font-size:16px;min-width:0}
      .logo img{width:29px;height:29px}
      .open-account{padding:7px 10px;font-size:12px}
      .product-page{padding-top:23px}
      .product-hero-card{padding:20px;border-radius:14px}
      .product-cover{min-height:180px;padding:18px}
      .product-info h1{font-size:28px}
      .product-summary{font-size:14px}
      .product-content{padding:21px}
      .footer-grid{grid-template-columns:1fr;gap:22px;padding:35px 0 25px}
      .footer-bottom{display:block;line-height:2}
      .footer-bottom span{display:block}
    }