:root{--theme:#0B3D91;--teal:#0891B2;--ink:#172033;--muted:#64748b;--line:#dbe5ee;--wash:#f3f8fb;--white:#fff;--shadow:0 16px 45px rgba(15,47,75,.1)}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7fafc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","PingFang TC",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:#172033;color:#dce8f0;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:20px}
    .topbar a{color:#dce8f0}
    .header{position:relative;background:var(--white);border-bottom:1px solid var(--line);z-index:20}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;color:var(--theme);white-space:nowrap}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 12px;color:#27364a;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-visible{color:var(--teal)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin-top:-4px}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);width:280px;padding:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:min(650px,calc(100vw - 40px))}
    .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;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a:not(.mega-footer),.mega-card{display:block;padding:9px 10px;border-radius:6px}
    .dropdown-panel>a:not(.mega-footer):hover,.mega-card:hover{background:var(--wash);color:var(--teal)}
    .mega-title{margin:0 0 10px;color:var(--theme);font-size:14px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}
    .mega-card{border:1px solid #e6eef3}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:5px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px}
    .mega-card small{color:var(--muted);font-size:11px;line-height:1.5;margin-top:2px}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--teal);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:9px}
    .member-btn,.open-btn{border-radius:5px;padding:8px 13px;font-size:13px;font-weight:700}
    .member-btn{color:var(--theme);border:1px solid #bed0df}
    .open-btn{color:#fff;background:var(--theme)}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(13,25,40,.48);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:50;transform:translateX(100%);transition:.25s;overflow-y:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:18px;border-bottom:1px solid var(--line);font-weight:800}
    .drawer-head>a{margin-left:auto;color:var(--theme)}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;cursor:pointer;color:var(--muted)}
    .drawer-menu{padding:12px 18px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:12px 0;border:0;border-bottom:1px solid #edf2f5;background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--teal);font-size:20px;font-weight:400}
    .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:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;padding:48px 0 20px;background:#172033;color:#c9d6e1}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px}
    .footer strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer h3{margin:0 0 12px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;color:#aebdca;font-size:13px}
    .footer-grid>div>a,.footer-grid>div>span{display:block;color:#b9c8d4;font-size:13px;margin:6px 0}
    .footer-grid a:hover{color:#66d1e6}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.14);margin-top:35px;padding-top:18px;color:#94a6b5;font-size:12px}
    .product-hero{padding:64px 0 44px;background:linear-gradient(135deg,#eef8fb 0%,#fff 58%,#edf3fb 100%);border-bottom:1px solid var(--line)}
    .breadcrumb{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px;color:var(--muted);font-size:13px}
    .breadcrumb a:hover{color:var(--teal)}
    .product-heading{max-width:820px}
    .product-heading h1{margin:0 0 12px;font-size:clamp(30px,5vw,52px);line-height:1.15;letter-spacing:0;color:var(--theme)}
    .product-heading p{max-width:720px;margin:0;color:#52657a;font-size:17px}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start;padding:42px 0}
    .product-content,.product-aside{min-width:0}
    .product-cover{background:#fff;border:1px solid var(--line);padding:16px;margin-bottom:24px;box-shadow:0 10px 28px rgba(21,61,87,.06)}
    .product-cover img{width:100%;max-height:400px;object-fit:contain;background:#f8fbfd}
    .product-meta{display:flex;flex-wrap:wrap;gap:18px;padding:16px 0;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px;color:#34465a}
    .product-body img,.product-body video,.product-body iframe{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(--theme);line-height:1.3}
    .product-body a{color:var(--teal);text-decoration:underline}
    .aside-box{background:#fff;border:1px solid var(--line);padding:22px;margin-bottom:20px}
    .aside-box h2{margin:0 0 14px;font-size:18px;color:var(--theme)}
    .aside-box p{margin:0;color:var(--muted);font-size:14px}
    .related-product{display:grid;grid-template-columns:64px 1fr;gap:12px;padding:13px 0;border-top:1px solid #edf2f5}
    .related-product:first-of-type{border-top:0}
    .related-product img{width:64px;height:52px;object-fit:contain;background:var(--wash)}
    .related-product strong{display:block;font-size:13px;line-height:1.4}
    .related-product small{display:block;color:var(--muted);font-size:12px;margin-top:3px}
    .product-action{display:block;text-align:center;padding:11px 14px;background:var(--theme);color:#fff;border-radius:5px;font-weight:700;margin-top:18px}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .product-layout{grid-template-columns:minmax(0,1fr) 270px}
    }
    @media(max-width:720px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{padding:7px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .member-btn{display:none}
      .header-inner{min-height:68px}
      .open-btn{padding:7px 10px}
      .product-hero{padding:40px 0 30px}
      .product-heading h1{font-size:34px}
      .product-heading p{font-size:15px}
      .product-layout{display:block;padding:28px 0}
      .product-aside{margin-top:28px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:6px}
    }
    @media(max-width:460px){
      .footer-grid{grid-template-columns:1fr}
      .header-btns{gap:4px}
      .product-meta{gap:9px 15px}
    }