:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#687386;
      --line:#e5e9f0;
      --soft:#f5f7fb;
      --white:#fff;
      --shadow:0 16px 40px rgba(17,35,67,.09);
      --radius:16px;
    }
    *{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%;height:auto}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#101827;color:#c9d1df;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-info{display:flex;gap:22px}
    .topbar a{color:#dfe6f1}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:188px;font-weight:800;font-size:18px;letter-spacing:.02em}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:78px;padding:0 14px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{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%;z-index:30;visibility:hidden;opacity:0;transform:translate(-50%,8px);transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 14px 14px;padding:20px}
    .dropdown-panel{width:280px}
    .dropdown-panel a:not(.mega-footer){display:block;padding:9px 10px;border-bottom:1px solid #eef1f5;font-size:14px}
    .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{visibility:visible;opacity:1;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .mega-heading{font-size:16px;margin:0 0 14px;color:var(--ink)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
    .mega-card{display:flex;flex-direction:column;gap:2px;padding:11px;border:1px solid #edf0f5;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:var(--theme);background:#f5f8ff}
    .mega-card img{width:24px;height:24px;object-fit:contain;margin-bottom:3px}
    .mega-card strong{font-size:14px;line-height:1.45}
    .mega-card small{color:var(--muted);font-size:12px;line-height:1.5}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-link{color:var(--theme);font-size:14px;font-weight:700}
    .open-link{color:#fff;background:var(--theme);padding:8px 15px;border-radius:7px;font-size:13px}
    .hamburger{display:none;width:42px;height:40px;background:transparent;border:1px solid var(--line);border-radius:8px;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--ink);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;z-index:50;background:rgba(8,18,35,.52)}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:51;width:min(380px,88vw);overflow:auto;background:#fff;transform:translateX(100%);transition:transform .25s ease;box-shadow:-15px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:68px;display:flex;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{width:32px;height:32px;border:0;background:#f2f4f8;border-radius:50%;font-size:22px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #eef1f5;background:none;text-align:left;font-size:15px;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--muted);font-size:19px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 7px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#111a2b;color:#c8d0dd;padding:54px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand{color:#fff;font-size:20px;font-weight:800;margin-bottom:12px}
    .footer p{margin:7px 0;font-size:13px;line-height:1.8}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-grid>div>a{display:block;margin:8px 0;color:#c8d0dd;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:36px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);font-size:12px;color:#8995a7}
    .article-page{padding:50px 0 0;background:linear-gradient(180deg,#f6f8fc 0,#fff 420px)}
    .article-layout{display:grid;grid-template-columns:minmax(0,780px) 300px;gap:52px;align-items:start}
    .article-main{min-width:0;background:#fff}
    .article-breadcrumb{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:13px;margin-bottom:22px}
    .article-breadcrumb a:hover{color:var(--theme)}
    .article-title{margin:0;color:#101a2d;font-size:clamp(30px,4vw,48px);line-height:1.22;letter-spacing:-.03em}
    .article-meta{display:flex;flex-wrap:wrap;gap:14px 24px;margin:22px 0 28px;padding-bottom:20px;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
    .article-cover{width:100%;max-height:430px;object-fit:cover;border-radius:14px;background:#eef2f8;margin-bottom:30px}
    .article-content{min-width:0;max-width:100%;overflow-x:auto;color:#303b4e;font-size:16px;line-height:2}
    .article-content p{margin:0 0 1.25em}
    .article-content h2,.article-content h3{color:#111d32;line-height:1.4;margin:1.7em 0 .7em}
    .article-content h2{font-size:27px;border-left:4px solid var(--theme);padding-left:13px}
    .article-content h3{font-size:21px}
    .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}
    .article-content table td,.article-content table th{padding:9px 12px;border:1px solid var(--line);white-space:nowrap}
    .article-content blockquote{margin:1.4em 0;padding:15px 20px;background:#f4f7fc;border-left:4px solid var(--theme);color:#526078}
    .article-tags{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-top:34px;padding-top:20px;border-top:1px solid var(--line);font-size:13px}
    .article-tags strong{color:#172033}
    .tag-pill{padding:4px 11px;border-radius:20px;background:#eef3fb;color:var(--theme)}
    .article-nav{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:34px}
    .article-nav a{display:block;min-width:0;padding:15px 17px;border:1px solid var(--line);border-radius:10px;background:#fff}
    .article-nav a:hover{border-color:var(--theme);color:var(--theme)}
    .article-nav span{display:block;color:var(--muted);font-size:12px;margin-bottom:4px}
    .article-nav b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}
    .article-aside{position:sticky;top:20px}
    .side-card{padding:22px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 8px 25px rgba(17,35,67,.045);margin-bottom:18px}
    .side-card h2{font-size:17px;margin:0 0 14px;color:#15213a}
    .side-card p{font-size:13px;color:var(--muted);margin:0 0 12px}
    .related-list{list-style:none;padding:0;margin:0}
    .related-list li{padding:12px 0;border-bottom:1px solid #edf0f4}
    .related-list li:last-child{border-bottom:0}
    .related-list a{display:block;font-size:14px;line-height:1.55}
    .related-list a:hover{color:var(--theme)}
    .related-list small{display:block;margin-top:4px;color:#8a94a5;font-size:12px}
    .side-cta{display:block;text-align:center;padding:11px 14px;color:#fff;background:var(--theme);border-radius:8px;font-size:14px;font-weight:700}
    @media (max-width:1050px){
      .header-inner{gap:15px}
      .logo{min-width:155px}
      .nav-link{padding:0 8px}
      .article-layout{grid-template-columns:minmax(0,1fr) 260px;gap:28px}
    }
    @media (max-width:820px){
      .container{width:min(100% - 28px,680px)}
      .topbar-inner{height:auto;min-height:38px;gap:8px;padding:7px 0;align-items:flex-start}
      .topbar-info{gap:10px;flex-direction:column;text-align:right;line-height:1.3}
      .main-nav{display:none}
      .header-inner{height:68px}
      .header-btns{margin-left:auto}
      .member-link,.open-link{display:none}
      .hamburger{display:block}
      .article-page{padding-top:30px}
      .article-layout{display:block}
      .article-aside{position:static;margin-top:38px}
      .footer{margin-top:55px;padding-top:38px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
    }
    @media (max-width:520px){
      .container{width:calc(100% - 28px)}
      .logo{font-size:16px;min-width:0}
      .logo img{width:32px;height:32px}
      .topbar{font-size:11px}
      .article-title{font-size:30px}
      .article-content{font-size:15px;line-height:1.9}
      .article-nav{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:5px}
    }