:root{
  --blue:#0B3D91;
  --ink:#172033;
  --muted:#6b7280;
  --line:#e5e9f0;
  --soft:#f5f7fb;
  --white:#fff;
  --shadow:0 16px 40px rgba(20,38,72,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",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:#102039;color:#dbe5f4;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.topbar a{color:#dbe5f4;margin-left:18px}
.topbar a:hover{color:#fff}

.header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--blue);font-size:19px;font-weight:800;white-space:nowrap}
.logo img{width:36px;height:36px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;gap:5px;padding:26px 13px;color:#26344a;font-size:14px;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--blue)}
.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:translateX(-50%);visibility:hidden;opacity:0;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.2s;z-index:20}
.dropdown-panel{width:250px;padding:10px;border-radius:0 0 12px 12px}
.dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:14px}
.dropdown-panel a:hover{background:var(--soft);color:var(--blue)}
.mega-menu{width:700px;padding:20px;border-radius:0 0 16px 16px}
.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;pointer-events:auto}
.mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.mega-card{display:block;min-width:0;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fff}
.mega-card:hover{border-color:#b8c9e8;background:#f8faff}
.mega-card img{height:42px;width:100%;object-fit:contain;object-position:left center;margin-bottom:7px}
.mega-card strong{display:block;font-size:14px;margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mega-card small{display:block;color:var(--muted);font-size:12px;line-height:1.55}
.mega-footer{display:inline-block;margin-top:15px;padding:8px 12px;color:var(--blue);font-size:13px;border-radius:8px;background:#f2f6fd}
.mega-footer:hover{background:#e6effc}
.product-menu{width:720px}
.header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
.member-entry,.open-account{font-size:13px;border-radius:7px;padding:8px 12px}
.member-entry{color:var(--blue);border:1px solid #cbd8ef}
.open-account{color:#fff;background:var(--blue)}
.member-entry:hover{background:#f2f6fd}
.open-account:hover{background:#092f70}
.hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;background:var(--ink);margin:4px 0;transition:.2s}
.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{display:none;position:fixed;inset:0;background:rgba(10,24,44,.48);z-index:50}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;z-index:60;transform:translateX(100%);transition:transform .25s;box-shadow:-12px 0 35px rgba(0,0,0,.16)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--blue)}
.drawer-head>a{margin-left:auto;background:var(--blue);color:#fff;padding:5px 10px;border-radius:5px;font-size:13px}
.drawer-close{border:0;background:transparent;font-size:27px;line-height:1;cursor:pointer;color:#667085}
.drawer-menu{padding:12px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:20px;line-height:1}
.drawer-toggle.active{color:var(--blue)}
.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}

.article-page{background:#f6f8fc;padding-bottom:72px}
.article-hero{padding:58px 0 40px;background:linear-gradient(135deg,#eef4fd 0%,#fff 70%)}
.article-crumbs{display:flex;align-items:center;gap:8px;color:#718096;font-size:13px;margin-bottom:20px}
.article-crumbs a{color:var(--blue)}
.article-title{max-width:900px;margin:0 auto 20px;text-align:center;font-size:clamp(30px,4.5vw,52px);line-height:1.25;letter-spacing:-.03em;color:#142844}
.article-intro{max-width:760px;margin:0 auto;text-align:center;color:#667085;font-size:16px}
.article-meta{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:14px 24px;margin-top:24px;color:#7a8698;font-size:13px}
.article-meta strong{color:var(--blue);font-weight:600}
.article-layout{display:grid;grid-template-columns:minmax(0,820px) 280px;gap:28px;align-items:start;margin-top:30px}
.article-main-card,.article-side-card{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 25px rgba(20,38,72,.045)}
.article-main-card{padding:clamp(22px,4vw,48px)}
.article-cover{width:100%;max-height:460px;object-fit:cover;border-radius:11px;margin-bottom:30px}
.article-content{min-width:0;max-width:100%;overflow-x:auto;color:#344054;font-size:16px}
.article-content h2,.article-content h3{color:#172b4d;line-height:1.4;margin:30px 0 14px}
.article-content h2{font-size:25px;border-left:4px solid var(--blue);padding-left:12px}
.article-content h3{font-size:20px}
.article-content p{margin:0 0 18px}
.article-content img,.article-content video{max-width:100%;height:auto}
.article-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;margin:18px 0}
.article-content th,.article-content td{padding:10px 14px;border:1px solid var(--line);white-space:nowrap}
.article-content blockquote{margin:24px 0;padding:16px 20px;border-left:4px solid #9db5dc;background:#f4f7fc;color:#5e6b7e}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:32px;padding-top:22px;border-top:1px solid var(--line);font-size:13px}
.article-tags a{padding:5px 10px;background:#edf3fc;color:var(--blue);border-radius:99px}
.article-side{display:grid;gap:18px}
.article-side-card{padding:20px}
.article-side-card h3{font-size:17px;margin:0 0 15px;color:#203452}
.article-side-card p{font-size:13px;color:var(--muted);margin:0}
.article-share{display:flex;gap:8px;flex-wrap:wrap}
.article-share span{font-size:13px;color:var(--muted);width:100%}
.article-share a{padding:6px 10px;border:1px solid var(--line);border-radius:6px;color:var(--blue);font-size:12px}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:26px}
.article-nav a{display:block;padding:16px;background:#f7f9fc;border:1px solid var(--line);border-radius:10px}
.article-nav a:last-child{text-align:right}
.article-nav small{display:block;color:var(--muted);font-size:12px;margin-bottom:5px}
.article-nav strong{display:block;font-size:14px;line-height:1.5}
.related-section{margin-top:34px}
.related-section h2{margin:0 0 16px;font-size:24px;color:#172b4d}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.related-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px}
.related-card:hover{border-color:#a6bce2;box-shadow:var(--shadow)}
.related-card img{width:100%;height:130px;object-fit:cover;border-radius:8px;margin-bottom:12px}
.related-card h3{margin:0 0 7px;font-size:16px;line-height:1.45}
.related-card p{margin:0;color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card .related-meta{margin-top:10px;color:#8a94a6;font-size:12px}

.footer{background:#101d31;color:#c6d0df;padding:48px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr 1.1fr;gap:34px}
.footer h3,.footer h4{color:#fff;margin:0 0 15px}
.footer h3{font-size:20px}
.footer h4{font-size:15px}
.footer p{margin:6px 0;color:#aebbd0;font-size:13px}
.footer-grid>div>a{display:block;margin:7px 0;color:#b9c7d9;font-size:13px}
.footer-grid>div>a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);color:#91a0b5;font-size:12px}

@media (max-width:980px){
  .header-inner{gap:15px}
  .nav-link{padding-left:8px;padding-right:8px}
  .article-layout{grid-template-columns:1fr}
  .article-side{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .container{width:min(100% - 28px,620px)}
  .topbar .container{min-height:44px;align-items:flex-start;justify-content:center;flex-direction:column;gap:0;padding:6px 0}
  .topbar a{margin-left:12px}
  .main-nav{display:none}
  .header-inner{min-height:68px}
  .header-btns{margin-left:auto}
  .member-entry{display:none}
  .hamburger{display:block}
  .article-hero{padding:36px 0 28px}
  .article-title{font-size:32px}
  .article-intro{font-size:14px}
  .article-layout{margin-top:18px}
  .article-main-card{padding:20px 16px}
  .article-content{font-size:15px}
  .article-side{grid-template-columns:1fr}
  .article-nav{grid-template-columns:1fr}
  .article-nav a:last-child{text-align:left}
  .related-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-bottom{display:block}
  .footer-bottom span{display:block;margin-top:6px}
}
@media (max-width:460px){
  .open-account{display:none}
  .footer-grid{grid-template-columns:1fr}
  .article-meta{justify-content:flex-start}
}