:root{
      --theme:#0B3D91;
      --theme-dark:#082b67;
      --ink:#162033;
      --muted:#68758a;
      --line:#e5eaf1;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#19b67a;
      --shadow:0 16px 45px rgba(19,42,78,.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}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{height:38px;background:#081b3a;color:#b9c8df;font-size:12px}
    .topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .topbar strong{color:#fff;font-weight:700}
    .topbar a{margin-left:22px;color:#dbe8fa}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-size:19px;font-weight:800;letter-spacing:.2px}
    .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:25px 14px;color:#344156;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);visibility:hidden;opacity:0;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 14px 14px;padding:20px;z-index:30}
    .dropdown-panel{width:270px}
    .dropdown-panel a{display:block;padding:9px 4px;border-bottom:1px solid #eef1f5;color:#45546a}
    .dropdown-panel a:last-child{border:0;color:var(--theme);font-weight:700}
    .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{visibility:visible;opacity:1}
    .nav-item:hover>.dropdown-panel:before,.nav-item:hover>.mega-menu:before{content:"";position:absolute;top:-16px;left:0;right:0;height:16px}
    .mega-title{margin:0 0 12px;color:var(--theme);font-size:13px;font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid #edf0f4;border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#a9c0e8;background:#f4f8ff}
    .mega-card img{width:36px;height:36px;object-fit:contain;border-radius:7px}
    .mega-card b{display:block;color:#26364e;font-size:13px}
    .mega-card span span{display:inline;color:#7b8798;font-size:11px}
    .mega-links{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
    .mega-links a{padding:7px 9px;background:#f3f6fa;border-radius:7px;color:#506078;font-size:12px}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .header-btns>a:first-child{color:var(--theme);font-weight:700}
    .account-btn{padding:9px 15px;background:var(--theme);color:#fff;border-radius:8px;font-weight:700}
    .account-btn:hover{background:var(--theme-dark)}
    .hamburger{display:none;width:40px;height:38px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);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(4,15,35,.55);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;width:min(360px,88vw);background:#fff;z-index:50;transform:translateX(105%);transition:.25s ease;overflow:auto;box-shadow:-14px 0 40px rgba(0,0,0,.15)}
    .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:800;color:var(--theme)}
    .drawer-head a{margin-left:auto;padding:6px 12px;background:var(--theme);color:#fff;border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:none;color:#627087;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 20px 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:#26364e;font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .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:7px 0;color:#6b778a;font-size:13px}
    .footer{margin-top:70px;background:#0b1931;color:#b6c3d7;padding:54px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:42px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:21px}
    .footer h4{margin:0 0 14px;color:#fff;font-size:14px}
    .footer p{margin:6px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#b6c3d7;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8999b3}
    .article-page{padding:48px 0 0}
    .article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}
    .article-main,.article-aside{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(21,44,78,.05)}
    .article-main{padding:38px 46px}
    .article-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800}
    .article-kicker:before{content:"";width:24px;height:3px;background:var(--accent);border-radius:4px}
    .article-title{margin:14px 0 14px;font-size:clamp(28px,4vw,44px);line-height:1.25;color:#172642;letter-spacing:-.5px}
    .article-meta{display:flex;flex-wrap:wrap;gap:18px;padding-bottom:23px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
    .article-cover{width:100%;max-height:430px;object-fit:cover;margin:26px 0;border-radius:12px;background:#edf2f8}
    .article-content{min-width:0;max-width:100%;overflow-x:auto;color:#35445b;font-size:16px}
    .article-content img,.article-content video,.article-content table{max-width:100%;height:auto}
    .article-content h2,.article-content h3{color:#172642;line-height:1.4;margin-top:30px}
    .article-content p{margin:0 0 20px}
    .article-content blockquote{margin:24px 0;padding:15px 20px;border-left:4px solid var(--theme);background:#f3f7fd;color:#53647b}
    .article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}
    .article-tags a{padding:4px 11px;border-radius:20px;background:#edf4ff;color:var(--theme);font-size:12px}
    .article-aside{padding:22px;position:sticky;top:20px}
    .aside-title{margin:0 0 15px;font-size:18px;color:#1c2c47}
    .aside-card{display:block;padding:14px 0;border-top:1px solid var(--line)}
    .aside-card:first-of-type{border-top:0}
    .aside-card strong{display:block;color:#32445d;line-height:1.5}
    .aside-card span{display:block;margin-top:5px;color:#8995a7;font-size:12px}
    .article-navigation{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:28px}
    .article-navigation a{padding:15px;border:1px solid var(--line);border-radius:10px;color:#52627a;background:#fbfcfe}
    .article-navigation a:last-child{text-align:right}
    .article-navigation b{display:block;margin-top:5px;color:var(--theme)}
    .like-section{margin-top:32px}
    .like-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .like-card{padding:16px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
    .like-card strong{display:block;line-height:1.5;color:#30415b}
    .like-card small{color:#8995a7}
    @media(max-width:980px){
      .header-inner{gap:15px}.logo{min-width:auto}.main-nav{display:none}.header-btns{margin-left:auto}.hamburger{display:block}
      .article-layout{grid-template-columns:1fr}.article-aside{position:static}.footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}.topbar{height:auto;padding:7px 0}.topbar .container{display:block}.topbar a{margin-left:12px}
      .header-inner{height:65px}.logo{font-size:16px}.logo img{width:29px;height:29px}.header-btns>a:first-child{display:none}
      .article-page{padding-top:24px}.article-main{padding:25px 20px}.article-title{font-size:29px}.article-meta{gap:8px 14px}
      .article-navigation,.like-grid{grid-template-columns:1fr}.article-navigation a:last-child{text-align:left}
      .footer{margin-top:40px;padding-top:38px}.footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:7px}
    }