:root{--theme:#0B3D91;--ink:#1d2733;--muted:#667384;--line:#e4e8ee;--soft:#f5f7fa;--amber:#c78928;--dark:#182331}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font:15px/1.7 Arial,"Microsoft YaHei",sans-serif}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:#172331;color:#dfe7f0;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{margin-left:20px;color:#fff}
    .header{position:relative;background:#fff;border-bottom:1px solid var(--line);z-index:20}
    .header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:20px;font-weight:700;color:var(--dark)}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:27px 13px;font-weight:600;white-space:nowrap}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid;border-bottom:1px solid;transform:rotate(45deg) translateY(-2px)}
    .nav-item:hover>.nav-link,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .mega-menu,.dropdown-panel{position:absolute;top:100%;left:50%;width:360px;padding:22px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 42px #1823311c;opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s;z-index:30}
    .dropdown-panel{width:250px}
    .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu,.nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel{opacity:1;visibility:visible;transform:translate(-50%,0)}
    .mega-menu:before,.dropdown-panel:before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}
    .dropdown-panel a{display:block;padding:8px 0;border-bottom:1px solid var(--line);font-size:13px}
    .mega-title{margin:0 0 12px;font-size:14px;font-weight:700;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
    .mega-grid>a{display:block;padding:10px;border:1px solid var(--line);background:#fbfcfd;font-size:13px}
    .mega-grid strong,.mega-grid small{display:block}
    .mega-grid small{color:var(--muted);font-size:11px;line-height:1.5}
    .mega-footer{display:block;margin-top:15px;color:var(--theme);font-size:13px;font-weight:700}
    .product-mini{display:grid!important;grid-template-columns:28px 1fr;column-gap:8px}
    .product-mini img{grid-row:span 2;width:28px;height:28px;object-fit:contain}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-btn{color:var(--theme);font-weight:700;white-space:nowrap}
    .open-btn{padding:8px 16px;background:var(--theme);color:#fff;font-weight:700}
    .hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--line);background:#fff;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:4px auto;background:var(--dark);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{position:fixed;inset:0;background:#1019238a;opacity:0;visibility:hidden;transition:.2s;z-index:40}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.25s;z-index:50;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line)}
    .drawer-head strong{margin-right:auto}
    .drawer-head a{padding:6px 12px;background:var(--theme);color:#fff}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border-bottom:1px solid var(--line);color:var(--ink);text-align:left;background:none;border-left:0;border-right:0;border-top:0;font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;font-size:20px;color:var(--muted)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#172331;color:#d5dde6}
    .footer .container{padding:48px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
    .footer h3{margin:0 0 12px;color:#fff;font-size:15px}
    .footer p{margin:5px 0;font-size:13px}
    .footer-grid>div>a{display:block;margin:5px 0;color:#d5dde6;font-size:13px}
    .footer-brand strong{font-size:20px;color:#fff}
    .footer-bottom{margin-top:35px;padding-top:18px;border-top:1px solid #ffffff25;font-size:12px;color:#aeb9c5}
    .ea-content-stack{padding:48px 0 20px;background:#fbfcfe}
    .product-breadcrumb{margin-bottom:24px;color:var(--muted);font-size:13px}
    .product-breadcrumb a{color:var(--theme)}
    .product-hero{display:grid;grid-template-columns:minmax(0,390px) minmax(0,1fr);gap:48px;align-items:center;padding:34px;background:#fff;border:1px solid var(--line)}
    .product-cover{display:flex;align-items:center;justify-content:center;min-height:310px;padding:28px;background:linear-gradient(145deg,#eef3fa,#fff);border:1px solid var(--line)}
    .product-cover img{max-height:260px;object-fit:contain}
    .product-meta h1{margin:0 0 14px;color:var(--dark);font-size:clamp(28px,4vw,44px);line-height:1.2}
    .product-summary{margin:0 0 20px;color:var(--muted);font-size:16px}
    .product-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:24px 0}
    .product-fact{padding:13px;background:var(--soft);border-left:3px solid var(--theme)}
    .product-fact span{display:block;color:var(--muted);font-size:12px}
    .product-fact strong{display:block;margin-top:2px;color:var(--dark);font-size:15px}
    .product-actions{display:flex;flex-wrap:wrap;gap:12px}
    .product-actions a{display:inline-block;padding:11px 20px;background:var(--theme);color:#fff;font-weight:700}
    .product-actions a.secondary{background:#eef2f7;color:var(--theme)}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;margin-top:28px}
    .product-panel{min-width:0;padding:30px;background:#fff;border:1px solid var(--line)}
    .product-panel h2{margin:0 0 20px;padding-bottom:12px;border-bottom:2px solid var(--theme);font-size:22px}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;color:#394554}
    .product-body img,.product-body table{max-width:100%}
    .product-body table{border-collapse:collapse}
    .product-body th,.product-body td{padding:8px 12px;border:1px solid var(--line)}
    .product-aside{min-width:0}
    .aside-box{padding:22px;background:#fff;border:1px solid var(--line)}
    .aside-box+.aside-box{margin-top:18px}
    .aside-box h3{margin:0 0 14px;font-size:17px}
    .related-product{display:block;padding:12px 0;border-top:1px solid var(--line)}
    .related-product strong{display:block;color:var(--dark)}
    .related-product small{display:block;color:var(--muted);font-size:12px}
    .product-notice{margin-top:18px;padding:16px;background:#fff8e8;border-left:4px solid var(--amber);color:#77551d;font-size:13px}
    @media(max-width:1000px){
      .main-nav{display:none}
      .hamburger{display:block}
      .product-hero{grid-template-columns:300px minmax(0,1fr);gap:28px}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,600px)}
      .topbar .container{display:block;padding:7px 0}
      .topbar .container>span{display:block}
      .topbar a:first-child{margin-left:0}
      .header-inner{min-height:68px;gap:12px}
      .header-btns{margin-left:auto}
      .member-btn{display:none}
      .product-hero,.product-layout{grid-template-columns:1fr}
      .product-hero{padding:18px}
      .product-cover{min-height:220px}
      .product-facts{grid-template-columns:1fr 1fr}
      .product-panel{padding:20px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
    }
    @media(max-width:460px){
      .open-btn{display:none}
      .product-facts{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr}
    }