:root{
      --theme:#0B3D91;
      --ink:#172033;
      --muted:#687386;
      --line:#e6ebf2;
      --paper:#f7f9fc;
      --white:#fff;
      --shadow:0 14px 40px rgba(20,43,82,.09);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f6f8fb;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#10213d;color:#dce7f8;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{color:#fff;margin-left:20px}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;font-size:19px;font-weight:800;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 14px;color:#26344b;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);width:320px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:620px}
    .nav-item:hover>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.dropdown-panel,.nav-item:focus-within>.mega-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-10px;height:10px}
    .panel-title{margin:0 0 14px;color:var(--theme);font-size:16px}
    .panel-list{display:grid;gap:8px}
    .panel-list a{display:block;padding:7px 0;border-bottom:1px solid #eef1f5;font-size:14px}
    .panel-list a:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:flex;min-height:94px;flex-direction:column;gap:4px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
    .mega-card:hover{border-color:#a9bfe3;background:#f2f6fc}
    .mega-card img{width:28px;height:28px;object-fit:contain}
    .mega-card strong{font-size:13px}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-footer{display:block;margin-top:16px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-link{color:var(--theme);font-size:14px}
    .open-account{display:inline-flex;padding:8px 14px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px}
    .hamburger{display:none;width:42px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;padding:8px}
    .hamburger span{display:block;height:2px;margin:4px 0;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(8,22,44,.48);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;width:min(390px,88vw);overflow:auto;background:#fff;z-index:60;transform:translateX(100%);transition:.25s;box-shadow:-12px 0 35px rgba(0,0,0,.16)}
    .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 span{flex:1;color:var(--theme)}
    .drawer-head a{padding:6px 11px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#647188;font-size:28px;cursor:pointer;line-height:1}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .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 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#101d34;color:#c8d3e4}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px;padding:54px 0 38px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer p{margin:10px 0;color:#aebbd0;font-size:13px}
    .footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:#fff;font-weight:800;font-size:18px}
    .footer-brand img{width:34px;height:34px;object-fit:contain}
    .footer-links{display:grid;gap:8px}
    .footer-links a{color:#aebbd0;font-size:13px}
    .footer-links a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);color:#8d9db5;font-size:12px}
    .tool-detail-page{padding:48px 0 0}
    .tool-detail-page .crumbs{margin-bottom:24px;color:var(--muted);font-size:13px}
    .tool-detail-page .crumbs a{color:var(--theme)}
    .tool-detail-page .detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 315px;gap:28px;align-items:start}
    .tool-detail-page .tool-article,.tool-detail-page .tool-aside{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(22,46,83,.05)}
    .tool-detail-page .tool-article{padding:34px 38px}
    .tool-detail-page .tool-heading{display:flex;align-items:flex-start;gap:20px;padding-bottom:25px;border-bottom:1px solid var(--line)}
    .tool-detail-page .tool-icon{width:76px;height:76px;flex:0 0 76px;display:flex;align-items:center;justify-content:center;border-radius:18px;background:#eef4fd;object-fit:contain}
    .tool-detail-page h1{margin:0 0 8px;color:#142744;font-size:32px;line-height:1.3}
    .tool-detail-page .tool-intro{margin:0;color:var(--muted);font-size:15px}
    .tool-detail-page .tool-meta{display:flex;flex-wrap:wrap;gap:14px;margin-top:14px;color:#7a879b;font-size:12px}
    .tool-detail-page .tool-meta span{padding-right:14px;border-right:1px solid var(--line)}
    .tool-detail-page .tool-meta span:last-child{border-right:0}
    .tool-detail-page .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px;color:#364258;font-size:15px}
    .tool-detail-page .tool-content img,.tool-detail-page .tool-content video{max-width:100%;height:auto}
    .tool-detail-page .tool-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse}
    .tool-detail-page .tool-content h2,.tool-detail-page .tool-content h3{color:#162e55;margin:28px 0 12px}
    .tool-detail-page .tool-content p{margin:0 0 18px}
    .tool-detail-page .tool-content ul,.tool-detail-page .tool-content ol{padding-left:24px}
    .tool-detail-page .tool-aside{padding:24px;position:sticky;top:20px}
    .tool-detail-page .tool-aside h2{margin:0 0 15px;font-size:18px;color:#142744}
    .tool-detail-page .tool-side-card{display:grid;grid-template-columns:42px 1fr;gap:11px;padding:14px 0;border-top:1px solid var(--line)}
    .tool-detail-page .tool-side-card img{width:42px;height:42px;border-radius:10px;object-fit:contain;background:#f0f4fa}
    .tool-detail-page .tool-side-card strong{display:block;font-size:14px}
    .tool-detail-page .tool-side-card small{display:block;color:var(--muted);font-size:12px;line-height:1.5}
    .tool-detail-page .tool-actions{display:flex;gap:12px;margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}
    .tool-detail-page .tool-actions a{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border-radius:8px;background:var(--theme);color:#fff;font-size:14px}
    .tool-detail-page .tool-actions a.secondary{background:#edf3fb;color:var(--theme)}
    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-btns{margin-left:auto}
      .detail-layout{grid-template-columns:1fr}
      .tool-detail-page .tool-aside{position:static}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{display:block;padding:7px 0;font-size:11px}
      .topbar .container>span{display:block}
      .topbar a{margin-left:10px}
      .header-inner{height:66px;gap:10px}
      .logo{font-size:16px}
      .logo img{width:32px;height:32px}
      .member-link{display:none}
      .open-account{font-size:12px;padding:7px 10px}
      .tool-detail-page{padding-top:30px}
      .tool-detail-page .tool-article{padding:23px 18px}
      .tool-detail-page .tool-heading{display:block}
      .tool-detail-page .tool-icon{margin-bottom:15px}
      .tool-detail-page h1{font-size:26px}
      .tool-detail-page .tool-content{font-size:14px}
      .footer-grid{grid-template-columns:1fr;gap:25px;padding:36px 0 28px}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin:6px 0}
      .mega-grid{grid-template-columns:1fr 1fr}
    }