:root{
      --theme:#0B3D91;
      --theme-dark:#082b68;
      --ink:#172033;
      --muted:#667085;
      --line:#e6eaf0;
      --soft:#f5f8fc;
      --white:#fff;
      --accent:#18b88a;
      --radius:16px;
      --shadow:0 14px 40px rgba(19,46,86,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"Microsoft YaHei","PingFang SC",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{background:#081b3b;color:#cbd7e8;font-size:13px}
    .topbar .container{height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar strong{color:#fff}
    .topbar a{margin-left:20px;color:#dbeafe}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:188px;font-size:19px;font-weight:800;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 14px;color:#344054;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#98a2b3}
    .dropdown-panel,.mega-menu{
      position:absolute;top:100%;left:50%;transform:translateX(-50%);
      min-width:230px;padding:18px;background:#fff;border:1px solid var(--line);
      border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;
      transition:.2s ease;pointer-events:none
    }
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .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}
    .dropdown-panel a{display:block;padding:8px 6px;border-bottom:1px solid #f0f2f5;font-size:14px}
    .mega-menu{width:680px}
    .mega-title{margin:0 0 12px;color:var(--theme);font-size:13px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;min-width:0;padding:10px;border:1px solid #edf0f5;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#aac3ec;background:#f2f7ff}
    .mega-card img{width:38px;height:38px;object-fit:contain;border-radius:7px;background:#fff}
    .mega-card b,.mega-card span{display:block;overflow:hidden;text-overflow:ellipsis}
    .mega-card b{font-size:13px;white-space:nowrap}
    .mega-card span{font-size:11px;line-height:1.5;color:var(--muted)}
    .mega-links{display:flex;flex-wrap:wrap;gap:8px}
    .mega-links a{padding:5px 10px;border-radius:30px;background:var(--soft);font-size:12px}
    .mega-footer{display:block;margin-top:15px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .header-btns>a:first-child{color:var(--theme);font-size:14px}
    .account-btn{padding:9px 16px;border-radius:8px;background:var(--theme);color:#fff!important;font-size:13px}
    .hamburger{display:none;width:40px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--theme);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(8,27,59,.48);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-340px;width:min(340px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transition:right .25s ease;box-shadow:-10px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{right:0}
    .drawer-head{height:70px;display:flex;align-items:center;gap:14px;padding:0 18px;background:var(--theme);color:#fff;font-weight:700}
    .drawer-head span{flex:1}
    .drawer-head a{padding:5px 10px;border:1px solid rgba(255,255,255,.6);border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:none;color:#fff;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 4px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#98a2b3}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 12px;background:var(--soft)}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}

    .ea-content-stack{padding:34px 0 76px;min-height:600px}
    .product-breadcrumb{margin-bottom:22px;color:var(--muted);font-size:13px}
    .product-breadcrumb a{color:var(--theme)}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}
    .product-main-card,.product-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(18,44,78,.05)}
    .product-main-card{padding:34px}
    .product-heading{display:flex;gap:22px;align-items:flex-start;padding-bottom:24px;border-bottom:1px solid var(--line)}
    .product-cover{width:112px;height:112px;flex:0 0 112px;display:grid;place-items:center;padding:12px;border-radius:18px;background:#eef4ff;border:1px solid #d9e6fb}
    .product-cover img{max-height:88px;object-fit:contain}
    .product-heading h1{margin:0 0 8px;font-size:30px;line-height:1.3;color:#102a56}
    .product-summary{margin:0;color:var(--muted)}
    .product-meta{display:flex;flex-wrap:wrap;gap:16px;margin-top:14px;color:#7b8798;font-size:13px}
    .product-meta strong{color:var(--ink)}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:26px;color:#344054}
    .product-body img,.product-body table{max-width:100%}
    .product-body h2,.product-body h3{color:#102a56}
    .product-body table{border-collapse:collapse}
    .product-body td,.product-body th{padding:8px 12px;border:1px solid var(--line)}
    .product-side-card{padding:22px;position:sticky;top:20px}
    .product-side-card h2{margin:0 0 16px;font-size:18px;color:#102a56}
    .related-product{display:grid;grid-template-columns:58px 1fr;gap:11px;padding:13px 0;border-bottom:1px solid var(--line)}
    .related-product:last-child{border-bottom:0}
    .related-product img{width:58px;height:58px;border-radius:10px;object-fit:contain;background:#f2f5fa}
    .related-product h3{margin:0 0 3px;font-size:14px;line-height:1.4}
    .related-product p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}
    .product-contact{margin-top:20px;padding:16px;border-radius:12px;background:#eef5ff;color:#29466f;font-size:13px}
    .product-contact a{display:inline-block;margin-top:8px;color:var(--theme);font-weight:700}

    .footer{padding:48px 0 0;background:#081b3b;color:#b9c8dc}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px;padding-bottom:35px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:21px}
    .footer h4{margin:0 0 13px;color:#fff;font-size:14px}
    .footer p{margin:5px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:6px 0;color:#b9c8dc;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#91a5c0}

    @media(max-width:1050px){
      .header-inner{gap:12px}.logo{min-width:150px}.nav-link{padding-left:8px;padding-right:8px}.mega-menu{width:600px}
    }
    @media(max-width:820px){
      .topbar .container{height:auto;min-height:36px;padding-top:7px;padding-bottom:7px;align-items:flex-start;gap:4px;flex-direction:column}
      .topbar a{margin-left:0;margin-right:14px}
      .main-nav{display:none}.hamburger{display:block}.header-btns>a:first-child{display:none}
      .header-inner{height:68px}.product-layout{grid-template-columns:1fr}.product-side-card{position:static}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:560px){
      .container{width:min(100% - 28px,1180px)}
      .account-btn{display:none}.product-main-card{padding:20px}.product-heading{gap:14px;flex-direction:column}
      .product-cover{width:84px;height:84px;flex-basis:84px}.product-heading h1{font-size:24px}
      .footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:5px}
      .ea-content-stack{padding-top:22px}
    }