:root{
      --theme:#0B3D91;
      --deep:#071a35;
      --ink:#10233f;
      --muted:#63738c;
      --ice:#edf5ff;
      --line:#dce7f3;
      --white:#fff;
      --shadow:0 16px 42px rgba(12,45,86,.11);
      --radius:18px
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7faff;font-family:"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:auto}
    .topbar{background:var(--deep);color:#c9d8ee;font-size:13px}
    .topbar .container{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-info{display:flex;gap:24px}
    .topbar a:hover{color:#fff}
    .header{height:78px;background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:20}
    .header-inner{height:100%;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--deep);font-size:19px;font-weight:800}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 14px;color:#263b58;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);transition:.2s;z-index:30}
    .dropdown-panel{width:250px;padding:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:14px}
    .dropdown-panel a:hover{background:var(--ice);color:var(--theme)}
    .mega-menu{width:650px;padding:22px}
    .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:translate(-50%,0)}
    .mega-menu:before,.dropdown-panel:before{content:"";position:absolute;left:0;right:0;height:12px;top:-12px}
    .mega-title{font-weight:800;color:var(--deep);font-size:15px;margin-bottom:12px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:10px;border:1px solid var(--line);border-radius:10px;min-width:0}
    .mega-card:hover{border-color:#8db0de;background:#f8fbff}
    .mega-card img{width:42px;height:42px;object-fit:contain;border-radius:7px;background:#f1f6fc;flex:none}
    .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:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5;margin-top:3px}
    .mega-links{display:flex;flex-wrap:wrap;gap:8px}
    .mega-links a{padding:6px 10px;background:var(--ice);border-radius:20px;font-size:12px;color:var(--theme)}
    .mega-footer{display:block;margin-top:17px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{background:var(--theme);color:#fff;border-radius:8px;padding:8px 15px;font-size:13px}
    .hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--deep);margin:5px 0;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;background:rgba(5,18,38,.52);z-index:50}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;z-index:51;transition:.25s;overflow:auto}
    .mobile-drawer.open{right:0}
    .drawer-overlay.open{display:block}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--deep)}
    .drawer-head a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 4px;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{max-height:0;overflow:hidden;transition:.2s;padding-left:12px}
    .drawer-submenu.open{max-height:600px}
    .drawer-submenu a{display:block;padding:9px 4px;color:var(--muted);font-size:13px}
    .footer{background:var(--deep);color:#b8c8dc;margin-top:72px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding:52px 0 42px}
    .footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:18px}
    .footer-brand img{width:36px;height:36px;object-fit:contain}
    .footer p{font-size:13px;line-height:1.9;margin:16px 0 0;color:#9eb1ca}
    .footer h3{font-size:15px;color:#fff;margin:0 0 15px}
    .footer-links{display:flex;flex-direction:column;gap:8px;font-size:13px}
    .footer-links a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.13);padding:17px 0;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#91a5c0}
    .ea-content-stack{padding:54px 0 0;min-width:0}
    .product-hero{background:linear-gradient(135deg,#eef6ff,#fff);border-bottom:1px solid var(--line);padding:42px 0}
    .product-hero-inner{display:grid;grid-template-columns:300px minmax(0,1fr);gap:48px;align-items:center}
    .product-cover{height:250px;border:1px solid var(--line);border-radius:22px;background:#fff;display:flex;align-items:center;justify-content:center;padding:28px;box-shadow:var(--shadow)}
    .product-cover img{max-height:190px;object-fit:contain}
    .product-kicker{display:inline-flex;color:var(--theme);background:#dcecff;border-radius:20px;padding:5px 12px;font-size:12px;font-weight:700}
    .product-hero h1{font-size:clamp(28px,4vw,46px);line-height:1.2;color:var(--deep);margin:14px 0 12px}
    .product-summary{color:var(--muted);font-size:16px;max-width:760px;margin:0}
    .product-meta{display:flex;flex-wrap:wrap;gap:18px;margin-top:22px;color:#718198;font-size:13px}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start;margin-top:34px}
    .product-card,.related-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 26px rgba(15,52,92,.06)}
    .product-card{padding:30px}
    .product-card h2,.related-title{font-size:20px;color:var(--deep);margin:0 0 20px;padding-bottom:14px;border-bottom:1px solid var(--line)}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;color:#40536e;font-size:15px}
    .product-body img,.product-body video{max-width:100%;height:auto}
    .product-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
    .product-body p{margin:0 0 18px}
    .product-body h2,.product-body h3,.product-body h4{color:var(--deep)}
    .product-side{display:flex;flex-direction:column;gap:20px}
    .related-card{padding:22px}
    .related-title{font-size:17px}
    .related-item{display:flex;gap:12px;padding:13px 0;border-bottom:1px solid #edf1f6}
    .related-item:last-child{border-bottom:0}
    .related-item img{width:58px;height:58px;object-fit:contain;border-radius:10px;background:#f0f5fb;flex:none}
    .related-item strong{display:block;font-size:14px;color:var(--deep);line-height:1.45}
    .related-item p{font-size:12px;color:var(--muted);margin:4px 0 0;line-height:1.5}
    .product-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}
    .product-actions a{border-radius:9px;padding:10px 18px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .product-actions a.secondary{background:#e9f2ff;color:var(--theme)}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,600px)}
      .topbar .container{height:auto;min-height:38px;padding:7px 0;align-items:flex-start;gap:8px;flex-direction:column}
      .topbar-info{gap:12px;flex-wrap:wrap}
      .header{height:70px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .open-account{padding:7px 11px}
      .product-hero{padding:28px 0}
      .product-hero-inner,.product-layout{grid-template-columns:1fr;gap:24px}
      .product-cover{height:210px}
      .product-hero h1{font-size:30px}
      .product-card{padding:20px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px;padding:38px 0}
      .footer-bottom{flex-direction:column;gap:7px}
    }
    @media(max-width:480px){
      .footer-grid{grid-template-columns:1fr}
      .product-meta{gap:9px 16px}
    }