:root{
  --theme:#0B3D91;
  --ink:#101827;
  --muted:#657083;
  --line:#e4e9f0;
  --soft:#f5f7fa;
  --white:#fff;
  --accent:#c99737;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#fff;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}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.topbar{background:#071d43;color:#dbe7fb;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.topbar a{color:#dbe7fb;margin-left:18px}
.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;flex:none;font-weight:800;color:var(--theme);font-size:18px}
.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;margin:0;padding:0}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;min-height:76px;padding:0 13px;color:#263247;font-size:15px;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{color:var(--theme)}
.has-arrow:after{content:"";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%;width:330px;transform:translate(-50%,8px);padding:20px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 45px rgba(15,31,58,.15);opacity:0;visibility:hidden;transition:.2s ease}
.mega-menu{width:560px}
.nav-item:after{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
.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)}
.panel-title{margin:0 0 14px;color:var(--theme);font-size:14px;font-weight:700}
.panel-list{display:grid;gap:9px}
.panel-list a{display:block;color:#334155;font-size:14px}
.panel-list a:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:flex;min-width:0;min-height:92px;flex-direction:column;gap:5px;padding:12px;border:1px solid var(--line);background:#fbfcfe}
.mega-card:hover{border-color:var(--theme);background:#f5f8fd}
.mega-card img{width:24px;height:24px;object-fit:contain}
.mega-card strong{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mega-card small{color:var(--muted);font-size:12px;line-height:1.45}
.mega-footer{display:inline-block;margin-top:16px;padding-top:12px;width:100%;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
.header-btns{display:flex;align-items:center;gap:10px;flex:none}
.member,.open-account{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 14px;border:1px solid var(--theme);font-size:13px}
.member{color:var(--theme)}
.open-account{background:var(--theme);color:#fff}
.hamburger{display:none;width:42px;height:40px;padding:9px;background:#fff;border:1px solid var(--line);cursor:pointer}
.hamburger span{display:block;width:20px;height:2px;margin:4px auto;background:var(--ink);transition:.2s}
.hamburger.active span:first-child{transform:translateY(6px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:last-child{transform:translateY(-6px) rotate(-45deg)}
.drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(4,13,29,.52);opacity:0;visibility:hidden;transition:.2s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;z-index:41;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(105%);transition:.25s ease;box-shadow:-12px 0 35px rgba(5,20,45,.2)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:10px;padding:18px 20px;border-bottom:1px solid var(--line)}
.drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
.drawer-close{width:34px;height:34px;border:1px solid var(--line);background:#fff;font-size:24px;line-height:1;cursor:pointer}
.drawer-menu{padding:12px 20px 30px}
.drawer-link,.drawer-toggle{display:flex;width:100%;min-height:48px;align-items:center;border-bottom:1px solid var(--line);background:none;color:var(--ink);font:inherit;text-align:left;cursor:pointer}
.drawer-toggle{justify-content:space-between}
.drawer-toggle:after{content:"+";color:var(--muted);font-size:20px}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{display:none;padding:6px 0 8px 14px;border-bottom:1px solid var(--line)}
.drawer-submenu.open{display:grid}
.drawer-submenu a{padding:7px 0;color:var(--muted);font-size:14px}
.footer{margin-top:72px;background:#0b1730;color:#c8d3e5}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:42px;padding:52px 0 40px}
.footer-brand{color:#dce6f5}
.footer-brand img{width:38px;height:38px;object-fit:contain;margin-bottom:12px}
.footer-brand strong{display:block;color:#fff;font-size:18px}
.footer h3{margin:0 0 16px;color:#fff;font-size:15px}
.footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#c8d3e5;font-size:14px}
.footer-grid a:hover{color:#fff}
.footer p{margin:10px 0;font-size:13px;color:#aebbd0}
.footer-bottom{padding:18px 0;border-top:1px solid rgba(255,255,255,.14);font-size:13px;color:#9eacc2}
.article-page{padding:0 0 20px}
.article-hero{padding:64px 0 42px;background:linear-gradient(135deg,#f5f8fc 0%,#fff 64%);border-bottom:1px solid var(--line)}
.article-kicker{display:flex;align-items:center;gap:12px;margin-bottom:16px;color:var(--theme);font-size:13px;font-weight:700}
.article-kicker:before{content:"";width:30px;height:2px;background:var(--accent)}
.article-title{max-width:900px;margin:0;font-size:clamp(30px,5vw,56px);line-height:1.18;letter-spacing:0;font-weight:800}
.article-meta{display:flex;flex-wrap:wrap;gap:18px;margin-top:22px;color:var(--muted);font-size:14px}
.article-shell{display:grid;grid-template-columns:minmax(0,820px) 280px;gap:64px;align-items:start;padding-top:46px}
.article-cover{width:100%;max-height:470px;object-fit:cover;margin-bottom:32px;background:#eef2f7}
.article-content{min-width:0;max-width:100%;overflow-x:auto;font-size:17px;color:#263247}
.article-content h2,.article-content h3{color:#142543;line-height:1.35;margin:34px 0 14px}
.article-content p{margin:0 0 20px}
.article-content img,.article-content table{max-width:100%;height:auto}
.article-content table{border-collapse:collapse}
.article-content blockquote{margin:26px 0;padding:14px 20px;border-left:3px solid var(--accent);background:#faf7ef;color:#5b4b2c}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}
.article-tags a{color:var(--theme)}
.article-side{position:sticky;top:24px}
.side-box{padding:20px;background:#f6f8fb;border-top:3px solid var(--theme)}
.side-box h2{margin:0 0 14px;font-size:16px}
.side-box p{margin:0;color:var(--muted);font-size:13px}
.article-share{margin-top:18px;padding:16px;background:#fff;border:1px solid var(--line);font-size:13px;color:var(--muted)}
.article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:42px;padding-top:24px;border-top:1px solid var(--line)}
.article-nav a{display:block;padding:15px;border:1px solid var(--line);color:var(--theme);font-size:14px}
.article-nav a:last-child{text-align:right}
.related-articles{margin-top:56px;padding-top:30px;border-top:1px solid var(--line)}
.related-articles h2{margin:0 0 20px;font-size:22px}
.related-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.related-card{padding:16px;border:1px solid var(--line);background:#fff}
.related-card strong{display:block;line-height:1.45}
.related-card small{display:block;margin-top:8px;color:var(--muted)}
@media(max-width:1050px){
  .main-nav{display:none}
  .hamburger{display:block}
  .article-shell{grid-template-columns:minmax(0,1fr) 240px;gap:32px}
}
@media(max-width:720px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:7px 0}
  .topbar a{margin:0 14px 0 0}
  .header-inner{min-height:66px;gap:10px}
  .header-btns{margin-left:auto}
  .member{display:none}
  .open-account{padding:0 10px}
  .article-hero{padding:42px 0 32px}
  .article-title{font-size:34px}
  .article-shell{display:block;padding-top:30px}
  .article-side{position:static;margin-top:32px}
  .article-content{font-size:16px}
  .article-nav{grid-template-columns:1fr}
  .article-nav a:last-child{text-align:left}
  .related-list{grid-template-columns:1fr}
  .footer{margin-top:48px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px;padding:38px 0 28px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:430px){
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .mega-menu,.dropdown-panel{left:auto;right:0;transform:translateY(8px)}
}