:root{
      --blue:#0B3D91;
      --blue-deep:#08295f;
      --ink:#17233a;
      --muted:#667085;
      --line:#e7ebf2;
      --paper:#f6f8fc;
      --white:#fff;
      --shadow:0 16px 48px rgba(18,44,88,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","微软雅黑",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:#071c40;color:#dce8ff;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:12px;align-items:center}
    .topbar a:hover{color:#fff}
    .header{background:#fff;border-bottom:1px solid var(--line);position:relative;z-index:20}
    .header-inner{height:78px;display:flex;align-items:center;gap:32px}
    .logo{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;color:var(--blue-deep);font-size:19px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{list-style:none;margin:0;padding:0;display:flex;align-items:stretch;justify-content:center;gap:4px}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:78px;padding:0 14px;font-size:14px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--blue)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin:0 0 4px 8px}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%);width:330px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .mega-menu{width:min(760px,calc(100vw - 30px))}
    .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}
    .dropdown-title,.mega-title{margin:0 0 14px;color:var(--blue-deep);font-size:14px;font-weight:800}
    .dropdown-articles{display:grid;gap:10px}
    .dropdown-articles a{font-size:14px;border-bottom:1px solid var(--line);padding-bottom:8px}
    .dropdown-more,.mega-footer{display:inline-block;margin-top:16px;color:var(--blue);font-size:13px;font-weight:700}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{display:block;padding:12px;border:1px solid var(--line);border-radius:12px;background:#fbfcff;transition:.2s}
    .mega-card:hover{border-color:#a9c0ec;transform:translateY(-2px)}
    .mega-card-logo{display:flex;align-items:center;gap:8px;min-height:30px}
    .mega-card-logo img{width:26px;height:26px;object-fit:contain}
    .mega-card strong,.mega-video-title,.mega-product-title{font-size:13px}
    .mega-card p{font-size:12px;color:var(--muted);margin:8px 0 0;line-height:1.5}
    .mega-card-meta{display:flex;flex-wrap:wrap;gap:6px 10px;color:var(--muted);font-size:11px;margin-top:9px}
    .mega-layout{display:grid;grid-template-columns:150px 1fr;gap:20px}
    .mega-categories{border-right:1px solid var(--line);padding-right:16px}
    .mega-categories>a{display:block;padding:6px 0;font-size:13px;color:var(--muted)}
    .mega-categories>a:hover{color:var(--blue)}
    .mega-video-cover,.mega-product-cover{width:100%;height:62px;object-fit:cover;border-radius:8px;margin-bottom:7px}
    .mega-tool-icon{width:28px!important;height:28px!important}
    .header-btns{display:flex;align-items:center;gap:12px}
    .header-member{color:var(--blue);font-size:13px;font-weight:700;white-space:nowrap}
    .header-open{background:var(--blue);color:#fff;padding:9px 16px;border-radius:9px;font-size:13px;font-weight:700;white-space:nowrap}
    .header-open:hover{background:var(--blue-deep)}
    .hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(4,18,42,.5);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-380px;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transition:right .25s;box-shadow:-12px 0 32px rgba(0,0,0,.15)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);font-weight:800;color:var(--blue-deep)}
    .drawer-head>a{margin-left:auto;background:var(--blue);color:#fff;border-radius:7px;padding:5px 11px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:26px;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--blue)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px;border-bottom:1px solid var(--line)}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{background:#081c3e;color:#cbd7ec;margin-top:70px}
    .footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.1fr;gap:44px;padding:54px 0 42px}
    .footer .logo{color:#fff}
    .footer-brand p{max-width:360px;color:#9fb0cc;font-size:13px}
    .footer h3{margin:3px 0 15px;color:#fff;font-size:15px}
    .footer-links,.footer-contact{display:grid;gap:9px;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-social{font-size:13px;color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.12);display:flex;justify-content:space-between;gap:20px;padding:18px 0;font-size:12px;color:#91a4c2}
    .footer-bottom-links{display:flex;gap:18px}
    .article-page{padding:46px 0 20px}
    .article-layout{display:grid;grid-template-columns:minmax(0,790px) 290px;gap:32px;align-items:start}
    .article-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
    .article-head{padding:38px 44px 26px;border-bottom:1px solid var(--line)}
    .article-breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:18px}
    .article-breadcrumb a{color:var(--blue)}
    .article-kicker{display:inline-flex;padding:5px 11px;border-radius:999px;background:#eaf1ff;color:var(--blue);font-size:12px;font-weight:700;margin-bottom:14px}
    .article-head h1{font-size:clamp(28px,4vw,44px);line-height:1.25;letter-spacing:-.03em;margin:0 0 18px;color:#13284b}
    .article-meta{display:flex;flex-wrap:wrap;gap:10px 20px;color:var(--muted);font-size:13px}
    .article-cover{width:100%;max-height:430px;object-fit:cover}
    .article-body{padding:36px 44px;min-width:0;max-width:100%;overflow-x:auto;font-size:16px;color:#344054}
    .article-body img,.article-body table{max-width:100%;height:auto}
    .article-body h2,.article-body h3{color:#13284b;line-height:1.35;margin:30px 0 14px}
    .article-body p{margin:0 0 1.2em}
    .article-body blockquote{margin:24px 0;padding:15px 20px;border-left:4px solid var(--blue);background:#f1f5fc;color:#52627b}
    .article-body a{color:var(--blue);text-decoration:underline}
    .article-tags{display:flex;flex-wrap:wrap;gap:8px;padding:0 44px 30px}
    .article-tags a{background:#f0f3f8;color:#52627b;border-radius:999px;padding:5px 11px;font-size:12px}
    .article-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:0 44px 38px}
    .article-nav a{display:block;border:1px solid var(--line);border-radius:12px;padding:13px;color:var(--blue);font-size:13px}
    .article-nav strong{display:block;color:var(--muted);font-size:11px;margin-bottom:4px}
    .side-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 8px 25px rgba(18,44,88,.06);margin-bottom:18px}
    .side-card h2{font-size:17px;color:#13284b;margin:0 0 16px}
    .side-intro{font-size:13px;color:var(--muted);margin:0}
    .like-list{display:grid;gap:14px}
    .like-item{padding-bottom:13px;border-bottom:1px solid var(--line)}
    .like-item:last-child{border-bottom:0;padding-bottom:0}
    .like-item a{font-size:14px;font-weight:700;line-height:1.5}
    .like-item p{margin:4px 0 0;color:var(--muted);font-size:12px}
    .article-cta{background:linear-gradient(145deg,var(--blue),#1766c9);color:#fff}
    .article-cta h2{color:#fff}
    .article-cta p{color:#dbe9ff;font-size:13px}
    .cta-link{display:inline-block;background:#fff;color:var(--blue);border-radius:8px;padding:9px 14px;font-size:13px;font-weight:700}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .header-btns{margin-left:auto}
    }
    @media(max-width:760px){
      .container{width:min(100% - 28px,640px)}
      .topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}
      .topbar-contact{font-size:12px}
      .header-inner{height:68px}
      .header-btns{gap:7px}
      .header-member{display:none}
      .header-open{padding:8px 11px}
      .article-page{padding-top:24px}
      .article-layout{display:block}
      .article-head{padding:26px 22px 22px}
      .article-head h1{font-size:29px}
      .article-body{padding:25px 22px}
      .article-tags{padding:0 22px 24px}
      .article-nav{padding:0 22px 26px;grid-template-columns:1fr}
      .article-cover{max-height:280px}
      .side-card{margin-top:20px}
      .footer-main{grid-template-columns:1fr 1fr;gap:30px;padding:38px 0}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block;line-height:2}
      .footer-bottom-links{margin-top:7px}
      .mega-menu,.dropdown-panel{display:none!important}
    }