:root{
      --theme:#0B3D91;
      --aurora:#8b5cf6;
      --ice:#7dd3fc;
      --ink:#080b18;
      --muted:#667085;
      --line:#e5e7eb;
      --paper:#f6f8fc;
      --white:#fff;
      --shadow:0 18px 50px rgba(11,61,145,.1);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:#172033;background:var(--paper);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#070b18;color:#c8d1e5;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:22px}
    .topbar a{color:#dbeafe;transition:color .2s}
    .topbar a:hover{color:var(--ice)}
    .header{position:relative;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid #edf0f5;box-shadow:0 3px 18px rgba(15,23,42,.04)}
    .header-inner{height:76px;display:flex;align-items:center;gap:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:#0b1733;font-weight:800;font-size:19px}
    .logo img{width:36px;height:36px;object-fit:contain;border-radius:10px}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:76px;padding:0 13px;color:#344054;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:0 0 4px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;visibility:hidden;opacity:0;transform:translate(-50%,8px);transition:.2s ease;background:#fff;border:1px solid #e7ebf2;border-radius:0 0 16px 16px;box-shadow:0 20px 45px rgba(15,23,42,.13);pointer-events:none}
    .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:#eef5ff;color:var(--theme)}
    .mega-menu{width:760px;padding:24px}
    .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);pointer-events:auto}
    .nav-item:after{content:"";position:absolute;left:0;right:0;bottom:-12px;height:14px}
    .mega-heading{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:16px}
    .mega-heading strong{font-size:18px;color:#101828}
    .mega-heading span{font-size:13px;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{display:grid;grid-template-columns:36px 1fr;column-gap:10px;padding:12px;border:1px solid #edf0f5;border-radius:11px;transition:.2s}
    .mega-card:hover{border-color:#b8d2f8;background:#f6faff;transform:translateY(-2px)}
    .mega-card img{grid-row:span 3;width:36px;height:36px;border-radius:8px;object-fit:cover}
    .mega-card strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card small{display:block;color:#8290a6;font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-footer{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;padding-top:14px;border-top:1px solid #edf0f5;color:var(--theme);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:14px;white-space:nowrap}
    .member-link{font-size:14px;color:var(--theme)}
    .account-link{padding:9px 17px;border-radius:8px;background:var(--theme);color:#fff;font-size:14px}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px 0;background:#172033;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:30;background:rgba(4,10,25,.48);opacity:0;visibility:hidden;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:31;width:min(390px,88vw);padding:22px;background:#fff;transform:translateX(100%);transition:.3s ease;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:18px;padding-bottom:18px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:#101828}
    .drawer-head a{padding:6px 13px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:transparent;color:#667085;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding-top:12px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 2px;border:0;border-bottom:1px solid #f0f2f5;background:transparent;color:#182230;text-align:left;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:#98a2b3;font-size:20px;line-height:1}
    .drawer-toggle.active{color:var(--theme)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:#667085;font-size:14px}
    .footer{margin-top:80px;background:#080d1d;color:#b4bfd3}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:42px;padding:56px 0 42px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer p{max-width:330px;margin:8px 0;color:#8e9ab0;font-size:13px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand) span{display:block;margin:7px 0;color:#9ca9be;font-size:13px}
    .footer a:hover{color:var(--ice)}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.1);color:#7e8ba1;font-size:12px}
    .category-page{padding:72px 0 0}
    .category-hero{text-align:center;max-width:760px;margin:0 auto 42px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:.12em}
    .eyebrow:before{content:"";width:24px;height:2px;background:linear-gradient(90deg,var(--aurora),var(--ice));border-radius:2px}
    .category-hero h1{margin:12px 0 10px;color:#0c1730;font-size:clamp(32px,5vw,54px);line-height:1.2;letter-spacing:-.04em}
    .category-hero p{margin:0;color:#667085;font-size:16px}
    .category-meta{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:20px}
    .category-meta span{padding:6px 13px;border:1px solid #dce6f5;border-radius:999px;background:#fff;color:#52627c;font-size:12px}
    .article-list{display:grid;gap:20px;max-width:1000px;margin:0 auto}
    .article-card{display:grid;grid-template-columns:300px minmax(0,1fr);overflow:hidden;background:#fff;border:1px solid #e8edf4;border-radius:16px;box-shadow:0 8px 28px rgba(15,23,42,.045);transition:.25s}
    .article-card:hover{transform:translateY(-4px);border-color:#b8d2f8;box-shadow:var(--shadow)}
    .article-cover{min-height:220px;background:#dbeafe;overflow:hidden}
    .article-cover img{width:100%;height:100%;min-height:220px;object-fit:cover;transition:transform .4s}
    .article-card:hover .article-cover img{transform:scale(1.04)}
    .article-body{min-width:0;padding:25px 28px;display:flex;flex-direction:column}
    .article-kicker{display:flex;justify-content:space-between;gap:14px;color:var(--theme);font-size:12px;font-weight:700}
    .article-title{margin:9px 0 8px;color:#14213d;font-size:22px;line-height:1.4}
    .article-summary{display:-webkit-box;overflow:hidden;margin:0;color:#69768b;font-size:14px;line-height:1.8;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .article-info{display:flex;flex-wrap:wrap;gap:14px;margin-top:16px;color:#8995a8;font-size:12px}
    .article-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}
    .article-tags span{padding:3px 9px;border-radius:5px;background:#f0f5fc;color:#55719a;font-size:11px}
    .article-footer{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:auto;padding-top:18px}
    .article-author{color:#8a96a8;font-size:12px}
    .read-more{color:var(--theme);font-size:13px;font-weight:700}
    .read-more:after{content:" →";transition:.2s}
    .article-card:hover .read-more:after{padding-left:5px}
    .pagination{display:flex;justify-content:center;gap:8px;margin-top:38px}
    .pagination a{min-width:38px;padding:7px 11px;border:1px solid #dbe3ef;border-radius:7px;background:#fff;color:#53627a;text-align:center;font-size:13px}
    .pagination a:hover,.pagination a.active{border-color:var(--theme);background:var(--theme);color:#fff}
    @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-card{grid-template-columns:250px minmax(0,1fr)}.mega-menu{width:680px}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;padding:8px 0;gap:2px}.topbar-links{gap:12px}
      .account-link{display:none}.header-inner{height:66px}.nav-link{height:66px}
      .category-page{padding-top:45px}.category-hero{margin-bottom:28px}.category-hero h1{font-size:34px}
      .article-card{display:block}.article-cover,.article-cover img{height:190px;min-height:190px}.article-body{padding:20px}
      .article-title{font-size:19px}.article-footer{margin-top:12px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px;padding:40px 0 30px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:5px}
    }