:root{--theme:#0B3D91;--ink:#142033;--muted:#667085;--line:#e5eaf1;--soft:#f5f8fc;--gold:#c89532}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:#fff;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",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% - 32px));margin:auto}
    .topbar{background:#071d43;color:#dce8fb;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .topbar a{margin-left:18px;color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 4px 18px #102c5510}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;font-size:19px;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{list-style:none;padding:0;margin:0;display:flex;align-items:stretch;gap:3px}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 13px;font-size:14px;color:#27364d;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:5px;color:#8491a5}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;transform:translateX(-50%) translateY(8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 18px 45px #14203320;padding:20px;transition:.2s;z-index:30}
    .dropdown-panel{width:300px}
    .mega-menu{width:680px}
    .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;transform:translateX(-50%) translateY(0)}
    .mega-title{margin:0 0 12px;font-size:13px;font-weight:800;color:var(--theme);letter-spacing:.08em}
    .dropdown-panel>a:not(.mega-footer),.mega-links a{display:block;padding:8px 0;border-bottom:1px solid #eef1f5;font-size:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;padding:10px;border:1px solid var(--line);border-radius:9px;background:#fbfcfe}
    .mega-card img{display:block;width:100%;height:48px;object-fit:contain;margin-bottom:6px}
    .mega-card strong,.mega-card small{display:block}
    .mega-card strong{font-size:13px}
    .mega-card small{font-size:11px;color:var(--muted);line-height:1.5}
    .mega-footer{display:block;margin-top:16px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{background:var(--theme);color:#fff;border-radius:5px;padding:8px 14px;font-size:13px}
    .hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;background:#1d2c42;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:#07152c99;z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:60;transform:translateX(100%);transition:.28s;overflow:auto;box-shadow:-10px 0 30px #07152c25}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;color:#667085;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;font-size:15px;color:#26344a}
    .drawer-toggle:after{content:"＋";float:right;color:#8995a7}
    .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:13px}
    .footer{margin-top:70px;background:#0b1b35;color:#cad7ea}
    .footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.35fr;gap:36px;padding:48px 0 38px}
    .footer h3{color:#fff;margin:0 0 12px;font-size:20px}
    .footer h4{margin:0 0 14px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px;color:#aebed3}
    .footer-grid>div>a{display:block;margin:7px 0;color:#b9c9dd;font-size:13px}
    .social-links{display:flex;gap:18px;margin-top:18px}
    .social-links a{color:#fff;font-size:13px}
    .footer-bottom{border-top:1px solid #ffffff18;padding:17px 0;display:flex;justify-content:space-between;gap:18px;color:#90a4c0;font-size:12px}
    .tool-detail-page{padding:46px 0 10px;background:linear-gradient(180deg,#f6f9fd 0,#fff 360px)}
    .breadcrumb{font-size:13px;color:var(--muted);margin-bottom:24px}
    .breadcrumb a{color:var(--theme)}
    .tool-head{display:grid;grid-template-columns:1fr 280px;gap:34px;align-items:center;padding:34px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:0 12px 35px #0b3d9110}
    .tool-kicker{display:inline-block;color:var(--theme);font-size:12px;font-weight:800;letter-spacing:.12em;margin-bottom:10px}
    .tool-head h1{margin:0 0 12px;font-size:clamp(28px,4vw,46px);line-height:1.2;color:#10284d}
    .tool-intro{margin:0;color:#596a82;font-size:16px}
    .tool-icon-box{min-height:190px;display:grid;place-items:center;border-radius:14px;background:linear-gradient(145deg,#edf4ff,#f9fbff);border:1px solid #dce8fa}
    .tool-icon-box img{width:130px;height:130px;object-fit:contain}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;margin-top:32px}
    .tool-content-card,.related-tools{border:1px solid var(--line);border-radius:15px;background:#fff;padding:28px}
    .tool-content-card h2,.related-tools h2{margin:0 0 18px;color:#10284d;font-size:22px}
    .tool-body{min-width:0;max-width:100%;overflow-x:auto;color:#40516a}
    .tool-body img,.tool-body table{max-width:100%}
    .tool-body h2,.tool-body h3{color:#172d50}
    .tool-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:26px;padding-top:20px;border-top:1px solid var(--line)}
    .tool-meta div{padding:12px;background:var(--soft);border-radius:9px}
    .tool-meta b,.tool-meta span{display:block}
    .tool-meta b{font-size:12px;color:#8290a3;font-weight:500}
    .tool-meta span{font-size:14px;color:#253d62;margin-top:3px}
    .related-tools{height:max-content}
    .related-item{display:grid;grid-template-columns:48px 1fr;gap:11px;padding:13px 0;border-bottom:1px solid #edf0f4}
    .related-item:last-child{border-bottom:0}
    .related-item img{width:48px;height:48px;object-fit:contain;border-radius:8px;background:#f4f7fb}
    .related-item strong{display:block;font-size:14px;color:#263d60}
    .related-item small{display:block;color:var(--muted);font-size:12px;line-height:1.5}
    .tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .tool-actions a{display:inline-block;padding:10px 18px;border-radius:6px;background:var(--theme);color:#fff;font-size:14px}
    .tool-actions a.secondary{background:#edf3fb;color:var(--theme)}
    @media(max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}
      .tool-head,.tool-layout{grid-template-columns:1fr}.tool-icon-box{min-height:145px}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:620px){
      .topbar .container{display:block;padding:7px 0}.topbar .container>span{display:block}.topbar a:first-child{margin-left:0}
      .member-link{display:none}.open-account{padding:7px 10px}
      .tool-detail-page{padding-top:28px}.tool-head,.tool-content-card,.related-tools{padding:20px}
      .tool-head h1{font-size:30px}.tool-meta{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr;gap:24px;padding:35px 0}.footer-bottom{display:block}.footer-bottom span{display:block;margin:4px 0}
    }