:root{
      --primary:#0B3D91;
      --primary-dark:#082d6b;
      --ink:#17243a;
      --muted:#64748b;
      --line:#dbe3ef;
      --surface:#f4f7fb;
      --white:#fff;
      --accent:#e7b84b;
      --shadow:0 18px 50px rgba(18,48,91,.10);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:Arial,"Microsoft YaHei","PingFang SC",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:#092f70;color:#dce9ff;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;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;font-size:19px;font-weight:700;color:var(--primary)}
    .logo img{width:38px;height:38px;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 14px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-visible{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);visibility:hidden;opacity:0;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:6px}
    .dropdown-panel{width:260px;padding:12px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-bottom:1px solid #edf1f6;font-size:14px}
    .dropdown-panel a:last-child{color:var(--primary);border-bottom:0}
    .mega-menu{width:720px;padding:20px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translate(-50%,0)}
    .mega-title{margin-bottom:12px;color:var(--primary);font-size:14px;font-weight:700}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:18px}
    .mega-card{display:block;min-height:82px;padding:10px;border:1px solid #e4eaf2;border-radius:4px;background:#fbfcfe}
    .mega-card:hover{border-color:var(--primary);background:#f3f7ff}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:5px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card small{color:var(--muted);font-size:11px;line-height:1.5;margin-top:2px}
    .mega-footer{display:block;padding-top:13px;border-top:1px solid var(--line);color:var(--primary);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-btn,.open-btn{padding:9px 14px;border-radius:4px;font-size:13px;white-space:nowrap}
    .member-btn{color:var(--primary);border:1px solid #b9c9e4}
    .open-btn{color:#fff;background:var(--primary)}
    .hamburger{display:none;width:42px;height:40px;padding:9px;border:1px solid var(--line);border-radius:4px;background:#fff;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--primary);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;z-index:40;background:rgba(8,25,55,.45)}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:50;width:min(380px,88vw);overflow:auto;background:#fff;transform:translateX(100%);transition:.25s ease;box-shadow:-15px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--primary)}
    .drawer-close{border:0;background:none;color:var(--muted);font-size:27px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:var(--ink);font-weight:600;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:18px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 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:72px;background:#0a1d3d;color:#cbd8ed}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:34px;padding:48px 0 38px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:20px}
    .footer p{margin:7px 0;font-size:13px}
    .footer a{display:block;margin:8px 0;color:#cbd8ed;font-size:13px}
    .footer a:hover{color:#fff}
    .footer-bottom{padding:18px 0;border-top:1px solid rgba(255,255,255,.15);font-size:12px;color:#9fb1cc}
    .ea-content-stack{padding:54px 0 0;background:linear-gradient(180deg,#f4f7fb 0,#fff 420px)}
    .product-breadcrumb{display:flex;align-items:center;gap:9px;margin-bottom:25px;color:var(--muted);font-size:13px}
    .product-breadcrumb a{color:var(--primary)}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;align-items:start}
    .product-main-card,.product-side-card{background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 32px rgba(18,48,91,.06)}
    .product-main-card{padding:34px}
    .product-heading{display:grid;grid-template-columns:190px minmax(0,1fr);gap:28px;align-items:center;padding-bottom:28px;border-bottom:1px solid var(--line)}
    .product-cover{display:flex;align-items:center;justify-content:center;min-height:170px;padding:20px;background:#f5f8fd;border:1px solid #e2e9f3;border-radius:5px}
    .product-cover img{max-height:150px;object-fit:contain}
    .product-heading h1{margin:0 0 12px;color:var(--ink);font-size:32px;line-height:1.25}
    .product-summary{margin:0;color:var(--muted);font-size:16px}
    .product-meta{display:flex;flex-wrap:wrap;gap:15px 24px;margin-top:18px;color:var(--muted);font-size:13px}
    .product-meta strong{color:var(--ink)}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:30px;color:#34445b;font-size:15px}
    .product-body img{max-width:100%;height:auto}
    .product-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
    .product-body h2,.product-body h3{color:var(--ink);line-height:1.35}
    .product-body h2{margin-top:28px;font-size:23px}
    .product-body h3{font-size:18px}
    .product-body a{color:var(--primary);text-decoration:underline}
    .product-side-card{padding:23px;position:sticky;top:20px}
    .product-side-card h2{margin:0 0 18px;font-size:18px;color:var(--ink)}
    .side-action{display:block;padding:12px 14px;margin-bottom:22px;border-radius:4px;background:var(--primary);color:#fff;text-align:center;font-weight:700}
    .side-action:hover{background:var(--primary-dark)}
    .side-list{margin:0;padding:0;list-style:none}
    .side-list li{padding:14px 0;border-top:1px solid #edf1f6}
    .side-list a{display:block;color:var(--ink);font-weight:700;font-size:14px}
    .side-list p{margin:4px 0 0;color:var(--muted);font-size:12px;line-height:1.5}
    .side-list small{display:block;margin-top:5px;color:#8794a8;font-size:11px}
    @media (max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .mega-menu{width:min(680px,calc(100vw - 30px))}
    }
    @media (max-width:760px){
      .container{width:min(100% - 28px,600px)}
      .topbar .container{padding:7px 0;display:block;font-size:12px}
      .topbar .container>span{display:block}
      .topbar a:first-child{margin-left:0}
      .topbar a{margin-left:12px}
      .header-inner{min-height:66px;gap:10px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-btn{display:none}
      .open-btn{padding:8px 10px;font-size:12px}
      .ea-content-stack{padding-top:32px}
      .product-layout{display:block}
      .product-main-card{padding:20px}
      .product-heading{display:block}
      .product-cover{margin-bottom:22px}
      .product-heading h1{font-size:26px}
      .product-summary{font-size:14px}
      .product-side-card{position:static;margin-top:20px}
      .footer{margin-top:45px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px;padding:34px 0}
      .footer-brand{grid-column:1/-1}
    }
    @media (max-width:430px){
      .header-btns{gap:6px}
      .open-btn{display:none}
      .footer-grid{grid-template-columns:1fr}
      .footer-brand{grid-column:auto}
    }