:root{
      --theme:#0B3D91;
      --deep:#071b46;
      --ink:#17284f;
      --muted:#687898;
      --line:#dfe7f3;
      --paper:#f5f8fc;
      --white:#fff;
      --accent:#21b7d7;
      --shadow:0 18px 50px rgba(15,47,105,.10);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:var(--deep);color:#d7e4fb;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-right{display:flex;gap:22px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--deep);font-weight:800;font-size:19px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:27px 14px;color:#30446c;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg);margin-top:-4px}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.2s ease}
    .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)}
    .dropdown-panel{width:260px;padding:12px;border-radius:0 0 14px 14px}
    .dropdown-panel a{display:block;padding:9px 12px;border-radius:8px;font-size:13px}
    .dropdown-panel a:hover{background:#edf5ff;color:var(--theme)}
    .mega-menu{width:720px;padding:20px;border-radius:0 0 18px 18px}
    .mega-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px;color:var(--deep)}
    .mega-heading a,.mega-footer{font-size:12px;color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:11px;padding:11px;border:1px solid #e8eef7;border-radius:12px;background:#fbfdff}
    .mega-card:hover{border-color:#9ec9ee;background:#f1f8ff}
    .mega-card img{width:42px;height:42px;object-fit:contain;border-radius:8px}
    .mega-card span{min-width:0}
    .mega-card b,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card b{font-size:13px;color:var(--deep)}
    .mega-card small{font-size:11px;color:var(--muted)}
    .mega-footer{display:block;margin-top:15px;padding-top:13px;border-top:1px solid var(--line)}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{padding:9px 16px;background:var(--theme);color:#fff;border-radius:9px;font-size:13px}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;background:var(--deep);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{position:fixed;inset:0;background:rgba(4,19,48,.48);opacity:0;visibility:hidden;z-index:40;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:50;transform:translateX(100%);transition:.25s ease;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:18px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--deep)}
    .drawer-head a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:#edf3fb;color:var(--deep);border-radius:50%;width:30px;height:30px;font-size:21px;line-height:1;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 2px;border:0;border-bottom:1px solid #edf1f7;background:none;text-align:left;color:var(--ink);font-size:15px;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:70px;background:var(--deep);color:#b9c9e5;padding:52px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:38px}
    .footer-brand{font-size:20px;font-weight:800;color:#fff;margin-bottom:12px}
    .footer p{margin:6px 0;font-size:13px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-grid>div>a{display:block;margin:6px 0;font-size:13px;color:#b9c9e5}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:35px;padding-top:18px;text-align:center;font-size:12px;color:#8ea4c8}

    .tool-detail-page{padding:42px 0 10px}
    .tool-breadcrumb{font-size:13px;color:var(--muted);margin-bottom:22px}
    .tool-breadcrumb a{color:var(--theme)}
    .tool-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
    .tool-article,.related-tools{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(15,47,105,.05)}
    .tool-article{padding:34px}
    .tool-heading{display:flex;gap:20px;align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:25px;margin-bottom:26px}
    .tool-icon{width:76px;height:76px;border-radius:18px;object-fit:contain;background:#edf5ff;padding:12px;flex:0 0 auto}
    .tool-heading h1{margin:0 0 8px;color:var(--deep);font-size:clamp(26px,4vw,42px);line-height:1.25}
    .tool-intro{margin:0;color:var(--muted);font-size:15px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:9px;margin-top:15px}
    .tool-meta span{padding:5px 10px;border-radius:30px;background:#eef5ff;color:var(--theme);font-size:12px}
    .tool-body{min-width:0;max-width:100%;overflow-x:auto;color:#405273;font-size:15px}
    .tool-body h2,.tool-body h3{color:var(--deep);margin:28px 0 10px}
    .tool-body p{margin:12px 0}
    .tool-body img,.tool-body table{max-width:100%;height:auto}
    .tool-body table{border-collapse:collapse;display:block;overflow-x:auto}
    .tool-body td,.tool-body th{border:1px solid var(--line);padding:8px 12px;white-space:nowrap}
    .tool-body ul,.tool-body ol{padding-left:24px}
    .tool-update{border-top:1px solid var(--line);margin-top:28px;padding-top:16px;color:var(--muted);font-size:12px}
    .related-tools{padding:22px;position:sticky;top:18px}
    .related-tools h2{margin:0 0 15px;color:var(--deep);font-size:19px}
    .related-tool-card{display:grid;grid-template-columns:48px 1fr;gap:12px;padding:13px 0;border-top:1px solid var(--line)}
    .related-tool-card img{width:48px;height:48px;object-fit:contain;border-radius:10px;background:#eff5fc;padding:7px}
    .related-tool-card b{display:block;font-size:14px;color:var(--deep);margin-bottom:3px}
    .related-tool-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}
    .tool-side-link{display:block;margin-top:16px;padding:11px;text-align:center;border:1px solid #b8d0ed;border-radius:9px;color:var(--theme);font-size:13px}

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .member-link{display:none}
      .mega-menu{display:none}
      .tool-detail-layout{grid-template-columns:1fr}
      .related-tools{position:static}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:600px){
      .container{width:min(100% - 28px,1180px)}
      .topbar-inner{padding:7px 0;align-items:flex-start}
      .topbar-right{flex-direction:column;gap:0;text-align:right}
      .header-inner{height:68px;gap:8px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .open-account{padding:8px 11px}
      .tool-detail-page{padding-top:25px}
      .tool-article{padding:21px}
      .tool-heading{gap:12px}
      .tool-icon{width:58px;height:58px;border-radius:13px;padding:9px}
      .tool-heading h1{font-size:27px}
      .tool-intro{font-size:14px}
      .footer{margin-top:40px;padding-top:35px}
      .footer-grid{grid-template-columns:1fr;gap:25px}
    }