:root{--brand:#0B3D91;--ink:#202832;--muted:#66717d;--line:#dce2e8;--paper:#fff;--soft:#f3f6f8;--accent:#d1a84b}
    *{box-sizing:border-box}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif;line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin-inline:auto}
    .topbar{background:#17212b;color:#e8edf1;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:16px}
    .topbar .contact{display:flex;gap:20px}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;flex:none;font-size:19px;font-weight:700}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:26px 11px;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--brand)}
    .has-arrow:after{content:"";display:inline-block;margin:0 0 3px 7px;width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:0;z-index:30;display:none;background:#fff;border:1px solid var(--line);box-shadow:0 12px 28px #1823301a}
    .dropdown-panel{width:260px;padding:10px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:10px;border-bottom:1px solid #edf0f2;font-size:14px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{display:block}
    .mega-menu{left:50%;width:min(760px,90vw);padding:18px;transform:translateX(-50%)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
    .mega-card{min-width:0;padding:12px;border:1px solid #e6eaee;background:#fff}
    .mega-card img{display:block;width:34px;height:34px;margin-bottom:8px;object-fit:contain}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:14px}
    .mega-card small{margin-top:5px;color:var(--muted);font-size:12px;line-height:1.5}
    .mega-footer{display:block;margin-top:12px;padding:10px 12px;background:var(--soft);color:var(--brand);font-size:13px;text-align:center}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .account-link{padding:8px 14px;background:var(--brand);color:#fff;font-size:14px}
    .hamburger{display:none;width:40px;height:40px;padding:10px;border:1px solid var(--line);background:#fff;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:4px 0;background:#202832;transition:transform .2s,opacity .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:40;display:none;background:#10182080}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;z-index:41;width:min(390px,88vw);height:100dvh;overflow:auto;background:#fff;transform:translateX(100%);transition:transform .25s}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:16px;background:#fff;border-bottom:1px solid var(--line)}
    .drawer-head>a{color:var(--brand)}
    .drawer-close{width:36px;height:36px;border:1px solid var(--line);background:#fff;font-size:22px;cursor:pointer}
    .drawer-menu{padding:10px 16px 24px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:12px 4px;border:0;border-bottom:1px solid #edf0f2;background:transparent;text-align:left;font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 4px;color:#53606c;font-size:14px}
    .footer{margin-top:64px;background:#17212b;color:#e8edf1}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px;padding:42px 0}
    .footer h3{margin:0 0 14px;color:#fff;font-size:16px}
    .footer p{margin:8px 0;color:#c5ced5;font-size:13px}
    .footer-grid a{display:block;margin:8px 0;color:#c5ced5;font-size:13px}
    .footer-bottom{padding:16px 0;border-top:1px solid #ffffff24;color:#b8c2ca;font-size:12px}
    .tool-detail-page{min-height:440px;padding:34px 0 0;background:#f5f7f9}
    .tool-detail-page .breadcrumb{margin-bottom:22px;color:var(--muted);font-size:13px}
    .tool-detail-page .breadcrumb a{color:var(--brand)}
    .tool-detail-page .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start}
    .tool-detail-page .tool-article,.tool-detail-page .related-tools{background:#fff;border:1px solid var(--line)}
    .tool-detail-page .tool-article{min-width:0;padding:30px}
    .tool-detail-page .tool-heading{padding-bottom:22px;border-bottom:1px solid var(--line)}
    .tool-detail-page .tool-heading h1{margin:0 0 12px;font-size:30px;line-height:1.3}
    .tool-detail-page .tool-meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:13px}
    .tool-detail-page .tool-intro{margin:22px 0;padding:16px 18px;border-left:3px solid var(--accent);background:#f7f8f9;color:#4c5863}
    .tool-detail-page .tool-icon{float:right;width:64px;height:64px;margin:0 0 14px 18px;object-fit:contain}
    .tool-detail-page .tool-body{min-width:0;max-width:100%;overflow-x:auto;margin-top:22px;overflow-wrap:anywhere}
    .tool-detail-page .tool-body img,.tool-detail-page .tool-body video,.tool-detail-page .tool-body iframe{max-width:100%}
    .tool-detail-page .tool-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
    .tool-detail-page .tool-body h2,.tool-detail-page .tool-body h3{margin-top:28px}
    .tool-detail-page .related-tools{padding:20px}
    .tool-detail-page .related-tools h2{margin:0 0 14px;font-size:18px}
    .tool-detail-page .related-tool{display:grid;grid-template-columns:38px minmax(0,1fr);gap:11px;padding:12px 0;border-top:1px solid #edf0f2}
    .tool-detail-page .related-tool img{width:36px;height:36px;object-fit:contain}
    .tool-detail-page .related-tool strong{display:block;font-size:14px}
    .tool-detail-page .related-tool small{display:block;margin-top:4px;color:var(--muted);font-size:12px}
    @media(max-width:1050px){
      .header-inner{gap:14px}
      .main-nav{display:none}
      .header-btns{margin-left:auto}
      .hamburger{display:block}
      .tool-detail-page .tool-layout{grid-template-columns:minmax(0,1fr) 260px}
    }
    @media(max-width:700px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:7px 0}
      .topbar .contact{gap:12px;flex-wrap:wrap}
      .header-inner{min-height:64px}
      .logo{font-size:17px}
      .account-link{padding:7px 10px}
      .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;padding:30px 0}
      .tool-detail-page{padding-top:22px}
      .tool-detail-page .tool-layout{grid-template-columns:1fr}
      .tool-detail-page .tool-article{padding:20px}
      .tool-detail-page .tool-heading h1{font-size:25px}
      .tool-detail-page .related-tools{padding:18px}
    }
    @media(max-width:420px){
      .footer-grid{grid-template-columns:1fr}
      .header-btns{gap:7px}
    }