:root{--theme:#0B3D91;--ink:#101828;--muted:#667085;--line:#e4e7ec;--paper:#f7f9fc;--white:#fff;--radius:18px;--shadow:0 16px 45px rgba(16,24,40,.08)}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","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:0 auto}
    .topbar{background:#0b1f3a;color:#dce7f7;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-info{display:flex;gap:22px}
    .topbar a{color:#dce7f7}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;white-space:nowrap;color:#0b1f3a}
    .logo img{width:34px;height:34px;object-fit:contain;border-radius:8px}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:27px 13px;font-size:14px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;color:#98a2b3}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);width:300px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:650px}
    .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){display:block;padding:9px 10px;border-bottom:1px solid #f0f2f5;font-size:14px}
    .dropdown-panel>a:hover,.mega-card:hover{background:#f1f5fb;color:var(--theme)}
    .mega-heading{margin:0 0 13px;font-size:15px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
    .mega-card{display:flex;flex-direction:column;gap:3px;padding:11px;border:1px solid #edf0f5;border-radius:12px;font-size:13px;min-width:0}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:3px}
    .mega-card strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card small{color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;margin-top:13px;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:10px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme);font-weight:700}
    .open-link{padding:8px 14px;background:var(--theme);color:#fff;border-radius:8px;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:transparent;padding:5px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;background:var(--ink);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}
    .mobile-drawer{display:none}
    .product-crumb{padding:22px 0 0;color:var(--muted);font-size:13px}
    .product-crumb a{color:var(--theme)}
    .ea-content-stack{padding:0 0 70px}
    .product-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start;padding-top:22px}
    .product-main,.product-sidebar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(16,24,40,.04)}
    .product-main{padding:clamp(22px,4vw,48px)}
    .product-kicker{display:inline-flex;align-items:center;padding:5px 11px;border-radius:999px;background:#e9f0fb;color:var(--theme);font-size:12px;font-weight:700}
    .product-title{font-size:clamp(30px,4vw,48px);line-height:1.2;letter-spacing:-.03em;margin:17px 0 12px}
    .product-summary{font-size:17px;color:var(--muted);margin:0 0 25px}
    .product-meta{display:flex;flex-wrap:wrap;gap:10px 22px;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .product-meta strong{color:var(--ink)}
    .product-cover{width:100%;max-height:410px;object-fit:cover;border-radius:14px;background:#eef3f9;margin:26px 0}
    .product-body{min-width:0;max-width:100%;overflow-x:auto;font-size:16px}
    .product-body img,.product-body video{max-width:100%;height:auto}
    .product-body table{max-width:100%;border-collapse:collapse}
    .product-body th,.product-body td{padding:9px 12px;border:1px solid var(--line)}
    .product-body h2,.product-body h3{margin-top:30px;line-height:1.35}
    .product-body blockquote{margin:22px 0;padding:15px 20px;border-left:4px solid var(--theme);background:#f5f8fd;color:#475467}
    .product-sidebar{padding:22px;position:sticky;top:20px}
    .sidebar-title{margin:0 0 16px;font-size:18px}
    .sidebar-note{padding:13px;background:#f5f8fd;border-radius:12px;color:var(--muted);font-size:13px;margin-bottom:20px}
    .related-product{display:grid;grid-template-columns:68px 1fr;gap:11px;padding:12px 0;border-top:1px solid var(--line)}
    .related-product img{width:68px;height:58px;object-fit:cover;border-radius:9px;background:#eef3f9}
    .related-product strong{display:block;font-size:14px;line-height:1.4}
    .related-product p{margin:4px 0 0;color:var(--muted);font-size:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
    .product-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border-radius:9px;font-weight:700;font-size:14px}
    .btn-primary{background:var(--theme);color:#fff}
    .btn-light{background:#edf3fb;color:var(--theme)}
    .footer{background:#0b1f3a;color:#d8e3f2;padding:48px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px}
    .footer-brand{font-size:20px;font-weight:800;color:#fff;margin-bottom:12px}
    .footer p{margin:7px 0;color:#aebed2;font-size:13px}
    .footer h3{margin:0 0 12px;color:#fff;font-size:15px}
    .footer-grid a{display:block;margin:7px 0;color:#b8c8da;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .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:#9eb0c5;font-size:12px}
    @media(max-width:1000px){
      .main-nav{display:none}
      .hamburger{display:block}
      .product-layout{grid-template-columns:1fr}
      .product-sidebar{position:static}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{align-items:flex-start;flex-direction:column;gap:0;padding:8px 0}
      .topbar-info{gap:12px;flex-wrap:wrap}
      .header-inner{height:67px;gap:10px}
      .member-link,.open-link{display:none}
      .product-layout{padding-top:12px}
      .product-main{padding:22px 17px}
      .product-sidebar{padding:18px}
      .footer-grid{grid-template-columns:1fr;gap:23px}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:4px}
      .mobile-drawer{display:block;position:fixed;z-index:50;top:0;right:0;width:min(88vw,360px);height:100vh;background:#fff;transform:translateX(100%);transition:.25s;overflow:auto;box-shadow:-15px 0 35px rgba(0,0,0,.18)}
      .mobile-drawer.open{transform:translateX(0)}
      .drawer-overlay{display:block;position:fixed;inset:0;background:rgba(11,31,58,.5);z-index:45;opacity:0;visibility:hidden;transition:.25s}
      .drawer-overlay.open{opacity:1;visibility:visible}
      .drawer-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:20px 18px;border-bottom:1px solid var(--line);font-weight:800;color:var(--theme)}
      .drawer-head a{padding:6px 10px;border-radius:7px;background:var(--theme);color:#fff;font-size:12px}
      .drawer-close{border:0;background:none;font-size:27px;line-height:1;color:#667085;cursor:pointer}
      .drawer-menu{padding:9px 18px 30px}
      .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f4;background:none;text-align:left;font-size:15px;color:var(--ink);cursor:pointer}
      .drawer-toggle:after{content:"＋";float:right;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:13px}
    }