:root{
      --primary:#0B3D91;
      --primary-dark:#082d6b;
      --ink:#17233b;
      --muted:#68758b;
      --line:#dfe6f0;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 18px 45px rgba(20,46,91,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7f9fc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","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:#0b1d3a;color:#cbd8ec;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#e6edf8}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #e8edf5}
    .header-inner{height:78px;display:flex;align-items:center;gap:32px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--primary);font-weight:800;font-size:19px}
    .logo img{width:34px;height:34px;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;height:78px;padding:0 13px;font-size:15px;font-weight:600;color:#273650;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin:0 0 4px 8px}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translate(-50%,8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid #e3eaf4;border-radius:14px;box-shadow:var(--shadow);transition:.2s;z-index:30}
    .dropdown-panel{width:260px;padding:12px}
    .dropdown-panel a{display:block;padding:10px 12px;border-radius:8px;font-size:14px}
    .dropdown-panel a:hover{background:var(--soft);color:var(--primary)}
    .mega-menu{width:700px;padding:22px}
    .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;pointer-events:auto;transform:translate(-50%,0)}
    .mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .mega-section-title{margin:0 0 13px;color:var(--primary);font-size:14px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;min-width:0;padding:10px;border:1px solid #edf1f7;border-radius:11px;transition:.2s}
    .mega-card:hover{border-color:#b9cce8;background:#f8fbff}
    .mega-card img{width:40px;height:40px;object-fit:contain;border-radius:8px;background:#f3f6fa;flex:none}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px;color:#24344f}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.55}
    .mega-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
    .mega-links a{padding:7px 12px;border-radius:20px;background:#eef4fc;color:var(--primary);font-size:12px}
    .header-btns{display:flex;align-items:center;gap:12px}
    .member-btn{padding:10px 16px;border-radius:9px;background:var(--primary);color:#fff;font-size:13px;font-weight:700;white-space:nowrap}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;background:var(--primary);transition:.2s}
    .drawer-overlay{position:fixed;inset:0;background:rgba(5,19,42,.48);opacity:0;visibility:hidden;transition:.25s;z-index:50}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.28s;z-index:60;overflow:auto;box-shadow:-12px 0 38px rgba(8,29,68,.2)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--primary);font-size:14px}
    .drawer-close{border:0;background:transparent;color:#71809a;font-size:28px;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 #edf1f6;background:transparent;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--primary);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .article-page{padding:52px 0 80px}
    .article-wrap{display:grid;grid-template-columns:minmax(0,800px) 290px;gap:30px;align-items:start}
    .article-main,.article-side{background:#fff;border:1px solid #e5ebf3;border-radius:var(--radius);box-shadow:0 10px 32px rgba(20,46,91,.06)}
    .article-main{padding:38px 42px}
    .article-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-size:13px;font-weight:800}
    .article-kicker:before{content:"";width:24px;height:3px;border-radius:5px;background:var(--primary)}
    .article-title{margin:14px 0 18px;font-size:clamp(28px,4vw,44px);line-height:1.25;letter-spacing:-.02em;color:#142541}
    .article-meta{display:flex;flex-wrap:wrap;gap:16px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .article-cover{width:100%;max-height:420px;object-fit:cover;border-radius:13px;margin:26px 0}
    .article-body{min-width:0;max-width:100%;overflow-x:auto;color:#34445d;font-size:16px}
    .article-body p{margin:0 0 20px}
    .article-body h2,.article-body h3{color:#172c50;line-height:1.35;margin:30px 0 14px}
    .article-body h2{font-size:25px;border-left:4px solid var(--primary);padding-left:12px}
    .article-body h3{font-size:20px}
    .article-body img,.article-body table{max-width:100%}
    .article-body blockquote{margin:24px 0;padding:18px 22px;background:#f2f6fc;border-left:4px solid var(--primary);color:#4a5b75;border-radius:0 10px 10px 0}
    .article-body ul,.article-body ol{padding-left:25px}
    .article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
    .article-tags a{padding:5px 11px;border-radius:20px;background:#edf4fd;color:var(--primary);font-size:12px}
    .article-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:30px;padding-top:22px;border-top:1px solid var(--line)}
    .article-nav a{padding:14px;background:#f6f8fb;border-radius:10px;font-size:13px}
    .article-nav a:last-child{text-align:right}
    .article-nav span{display:block;margin-bottom:3px;color:var(--muted);font-size:12px}
    .article-side{padding:22px;position:sticky;top:20px}
    .side-title{margin:0 0 15px;padding-bottom:12px;border-bottom:1px solid var(--line);font-size:18px;color:#172c50}
    .like-list{display:grid;gap:12px}
    .like-list a{padding-bottom:12px;border-bottom:1px solid #edf1f6;font-size:14px;line-height:1.55}
    .like-list a:hover{color:var(--primary)}
    .side-cta{margin-top:22px;padding:18px;border-radius:13px;background:linear-gradient(135deg,#0B3D91,#2f68b8);color:#fff}
    .side-cta strong{display:block;margin-bottom:6px;font-size:16px}
    .side-cta p{margin:0 0 13px;color:#dbe8fa;font-size:13px}
    .side-cta a{display:inline-block;padding:8px 13px;border-radius:7px;background:#fff;color:var(--primary);font-size:12px;font-weight:700}
    .footer{background:#0b1d3a;color:#aebed5;padding:54px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{margin:0;color:#aebed5;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:14px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#aebed5;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);font-size:12px}
    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{height:68px}
      .nav-link{height:68px}
      .article-wrap{grid-template-columns:1fr}
      .article-side{position:static}
    }
    @media(max-width:680px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .logo{min-width:0;font-size:16px}
      .member-btn{display:none}
      .article-page{padding:28px 0 55px}
      .article-main{padding:24px 18px}
      .article-title{font-size:29px}
      .article-meta{gap:9px;font-size:12px}
      .article-nav{grid-template-columns:1fr}
      .article-nav a:last-child{text-align:left}
      .footer-grid{grid-template-columns:1fr 1fr;gap:25px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:6px}
    }