:root{
  --theme:#0B3D91;
  --ink:#182334;
  --muted:#687386;
  --line:#e5eaf1;
  --soft:#f4f7fb;
  --white:#fff;
  --shadow:0 16px 45px rgba(20,43,78,.10);
  --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#f7f9fc;font:15px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","微软雅黑",Arial,sans-serif}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.topbar{height:38px;background:#10223b;color:#dce7f5;font-size:12px}
.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
.topbar a{color:#fff}
.header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.header-inner{height:78px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;font-size:19px;color:#12223b}
.logo img{width:34px;height:34px;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 13px;font-weight:600;color:#334057;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8792a2}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%) translateY(8px);width:300px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:40}
.mega-menu{width:720px}
.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:translateX(-50%) translateY(0)}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.panel-title{font-size:12px;color:var(--theme);font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px}
.dropdown-panel>a,.mega-list>a:not(.mega-card){display:block;padding:8px 0;border-bottom:1px solid #eef1f5;color:#344157}
.dropdown-panel>a:hover,.mega-list>a:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:24px}
.mega-list{display:grid;gap:6px}
.mega-card{display:flex;gap:10px;padding:8px;border-radius:10px}
.mega-card:hover{background:var(--soft)}
.mega-card img{width:42px;height:42px;object-fit:cover;border-radius:8px;background:#eef2f7;flex:none}
.mega-card span{min-width:0;display:grid;gap:1px}
.mega-card b{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mega-card small{display:block;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mega-footer{display:inline-block;margin-top:13px;color:var(--theme);font-weight:700}
.header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
.member-link{color:var(--theme);font-weight:700}
.open-link{background:var(--theme);color:#fff;padding:8px 15px;border-radius:8px;font-weight:700}
.hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;background:#182334;margin:4px 0;transition:.2s}
.drawer-overlay{display:none}
.mobile-drawer{display:none}

.ea-content-stack{padding:48px 0 80px}
.breadcrumb{color:var(--muted);font-size:13px;margin-bottom:22px}
.breadcrumb a{color:var(--theme)}
.product-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px;align-items:start}
.product-main,.product-sidebar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 30px rgba(28,48,78,.05)}
.product-main{padding:34px}
.product-heading{display:grid;grid-template-columns:170px minmax(0,1fr);gap:26px;align-items:center;padding-bottom:28px;border-bottom:1px solid var(--line)}
.product-cover{width:170px;height:170px;border-radius:18px;object-fit:cover;background:#edf2f8}
.product-kicker{font-size:13px;color:var(--theme);font-weight:800;margin:0 0 7px}
.product-heading h1{font-size:clamp(28px,4vw,42px);line-height:1.2;margin:0 0 12px;color:#13233d}
.product-summary{font-size:16px;color:#5c687b;margin:0}
.product-meta{display:flex;flex-wrap:wrap;gap:12px 22px;color:var(--muted);font-size:13px;margin-top:18px}
.product-meta strong{color:var(--ink)}
.product-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px;font-size:16px;color:#354156}
.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 h2,.product-body h3{color:#172a48;line-height:1.35;margin:28px 0 12px}
.product-body p{margin:0 0 18px}
.product-body ul,.product-body ol{padding-left:24px}
.product-share{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);margin-top:28px;padding-top:20px;color:var(--muted)}
.product-share a{color:var(--theme);font-weight:700}
.product-sidebar{padding:24px;position:sticky;top:104px}
.side-title{font-size:19px;margin:0 0 16px;color:#172a48}
.side-note{font-size:13px;color:var(--muted);margin:-7px 0 17px}
.related-product{display:grid;grid-template-columns:62px 1fr;gap:11px;padding:13px 0;border-top:1px solid var(--line)}
.related-product img{width:62px;height:62px;object-fit:cover;border-radius:10px;background:#edf2f8}
.related-product h3{font-size:14px;line-height:1.35;margin:0 0 5px}
.related-product p{font-size:12px;line-height:1.5;color:var(--muted);margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-product time{font-size:11px;color:#9099a7}
.side-link{display:block;text-align:center;border:1px solid #cdd8e7;color:var(--theme);border-radius:8px;padding:9px;margin-top:18px;font-weight:700}

.footer{background:#101c2f;color:#c8d2e0;padding:50px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
.footer strong{font-size:20px;color:#fff}
.footer h3{font-size:14px;color:#fff;margin:0 0 14px}
.footer p{font-size:13px;color:#aebbd0;margin:12px 0}
.footer-grid>div:not(.footer-brand) a{display:block;color:#b9c6d8;font-size:13px;margin:7px 0}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;color:#8e9caf;font-size:12px}

@media(max-width:1050px){
  .nav-link{padding-left:8px;padding-right:8px;font-size:13px}
  .mega-menu{width:650px}
}
@media(max-width:800px){
  .container{width:min(100% - 28px,620px)}
  .topbar{height:auto;padding:8px 0}
  .topbar .container{display:block}
  .topbar .contact{display:block;margin-top:2px}
  .header-inner{height:66px}
  .main-nav{display:none}
  .header-btns{margin-left:auto}
  .member-link{display:none}
  .open-link{padding:7px 11px;font-size:13px}
  .hamburger{display:block}
  .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:rgba(7,17,32,.48);z-index:50;display:block;opacity:0;visibility:hidden;transition:.2s}
  .drawer-overlay.open{opacity:1;visibility:visible}
  .mobile-drawer{display:block;position:fixed;top:0;right:0;width:min(88vw,370px);height:100vh;background:#fff;z-index:60;transform:translateX(100%);transition:.25s;overflow-y:auto}
  .mobile-drawer.open{transform:translateX(0)}
  .drawer-head{display:flex;align-items:center;gap:12px;padding:19px;border-bottom:1px solid var(--line);font-weight:700}
  .drawer-head>a{margin-left:auto;color:var(--theme)}
  .drawer-close{font-size:27px;line-height:1;border:0;background:transparent;color:#526074;cursor:pointer}
  .drawer-menu{padding:10px 19px 30px}
  .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f4;background:none;text-align:left;color:#26364f;font-size:15px;font-weight:600}
  .drawer-toggle:after{content:"＋";float:right;color:#8c98a9}
  .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:#667389;font-size:14px}
  .ea-content-stack{padding:28px 0 55px}
  .product-layout{grid-template-columns:1fr}
  .product-sidebar{position:static}
  .product-main{padding:22px}
  .product-heading{grid-template-columns:92px minmax(0,1fr);gap:16px}
  .product-cover{width:92px;height:92px;border-radius:12px}
  .product-heading h1{font-size:26px}
  .product-summary{font-size:14px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
}
@media(max-width:500px){
  .product-heading{grid-template-columns:1fr}
  .product-cover{width:110px;height:110px}
  .footer-grid{grid-template-columns:1fr}
}