:root{
      --blue:#0B3D91;
      --blue-deep:#07285f;
      --blue-soft:#eaf1fb;
      --ink:#132238;
      --muted:#63728a;
      --line:#dce5f0;
      --white:#fff;
      --bg:#f5f8fc;
      --shadow:0 18px 50px rgba(12,43,91,.12);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--bg);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}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{background:#071d43;color:#dce8fb;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar-contact{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{min-height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;color:var(--blue);font-size:19px}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:3px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;padding:27px 14px;color:#263954;font-size:15px;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:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translate(-50%,8px);opacity:0;visibility:hidden;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);z-index:30}
    .dropdown-panel{width:310px;padding:20px;border-radius:0 0 14px 14px}
    .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;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-title{font-weight:700;color:var(--blue);margin:0 0 12px}
    .news-link{display:block;padding:8px 0;border-bottom:1px solid #edf1f6;font-size:14px}
    .news-link:hover{color:var(--blue)}
    .dropdown-footer,.mega-footer{display:flex;justify-content:space-between;margin-top:14px;color:var(--blue);font-size:13px;font-weight:700}

    .mega-menu{width:min(920px,calc(100vw - 30px));padding:22px;border-radius:0 0 18px 18px}
    .mega-layout{display:grid;grid-template-columns:200px 1fr;gap:25px}
    .mega-side{border-right:1px solid var(--line);padding-right:20px}
    .mega-side h3{font-size:17px;margin:2px 0 8px;color:var(--blue-deep)}
    .mega-side p{color:var(--muted);font-size:12px;margin:0 0 15px}
    .mega-categories{display:grid;gap:6px}
    .mega-categories a{font-size:13px;color:#53647b;padding:4px 0}
    .mega-categories a:hover{color:var(--blue)}
    .mega-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
    .mega-head strong{font-size:15px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;border:1px solid #e5ebf3;border-radius:10px;padding:11px;background:#fbfdff;min-height:116px;transition:.2s}
    .mega-card:hover{border-color:#9bb8e4;transform:translateY(-2px)}
    .mega-card img{width:34px;height:34px;object-fit:contain;margin-bottom:7px}
    .mega-card strong{font-size:13px;display:block}
    .mega-card p{font-size:11px;color:var(--muted);margin:4px 0;line-height:1.5}
    .mega-meta{display:flex;flex-wrap:wrap;gap:5px 9px;color:#718198;font-size:10px;margin-top:6px}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .open-account{background:var(--blue);color:#fff;padding:9px 17px;border-radius:8px;font-size:13px;font-weight:700}
    .open-account:hover{background:var(--blue-deep)}
    .hamburger{display:none;border:0;background:transparent;padding:8px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;margin:5px 0;background:var(--blue);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(3,18,42,.5);z-index:50}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;z-index:60;transition:right .25s ease;box-shadow:-10px 0 30px rgba(0,0,0,.15);overflow:auto}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:13px;padding:20px;border-bottom:1px solid var(--line);color:var(--blue);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--blue);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer;color:#5d6d83}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:var(--ink);font-size:15px;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}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}

    .tool-detail-page{padding:54px 0 80px}
    .tool-breadcrumb{font-size:13px;color:var(--muted);margin-bottom:24px}
    .tool-breadcrumb a{color:var(--blue)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}
    .tool-main-card,.tool-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 35px rgba(16,48,93,.06)}
    .tool-main-card{padding:34px}
    .tool-heading{display:flex;gap:20px;align-items:center;padding-bottom:25px;border-bottom:1px solid var(--line)}
    .tool-icon{width:76px;height:76px;object-fit:contain;padding:12px;border:1px solid #d8e4f4;background:var(--blue-soft);border-radius:18px}
    .tool-heading h1{font-size:30px;line-height:1.3;margin:0 0 7px;color:var(--blue-deep)}
    .tool-heading p{margin:0;color:var(--muted);font-size:14px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin:22px 0;padding:15px 18px;background:#f7faff;border-radius:10px;color:#5e7088;font-size:13px}
    .tool-meta strong{color:var(--ink);font-weight:600}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;color:#34445b;font-size:16px}
    .tool-content h2,.tool-content h3{color:var(--blue-deep);margin:28px 0 12px}
    .tool-content p{margin:0 0 16px}
    .tool-content img,.tool-content table{max-width:100%;height:auto}
    .tool-content table{border-collapse:collapse}
    .tool-content td,.tool-content th{border:1px solid var(--line);padding:8px 12px}
    .tool-content ul,.tool-content ol{padding-left:24px}
    .tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
    .tool-primary,.tool-secondary{display:inline-flex;align-items:center;justify-content:center;border-radius:8px;padding:11px 20px;font-weight:700;font-size:14px}
    .tool-primary{background:var(--blue);color:#fff}
    .tool-secondary{border:1px solid #b9cbe5;color:var(--blue);background:#fff}
    .tool-side-card{padding:22px;position:sticky;top:20px}
    .tool-side-card h2{margin:0 0 16px;color:var(--blue-deep);font-size:19px}
    .related-tool{display:grid;grid-template-columns:46px 1fr;gap:12px;padding:13px 0;border-top:1px solid #edf1f6}
    .related-tool img{width:46px;height:46px;object-fit:contain;padding:7px;background:var(--blue-soft);border-radius:10px}
    .related-tool strong{display:block;font-size:14px;margin-bottom:3px}
    .related-tool p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}
    .side-more{display:block;text-align:center;margin-top:14px;border:1px solid #c4d4eb;color:var(--blue);border-radius:7px;padding:9px;font-size:13px}

    .footer{background:#071d43;color:#d3dff1}
    .footer-main{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:35px;padding:48px 0 38px}
    .footer .logo{color:#fff;margin-bottom:15px}
    .footer-brand p{font-size:13px;color:#aebed5;max-width:330px;margin:0 0 15px}
    .footer h3{font-size:15px;color:#fff;margin:0 0 14px}
    .footer-links,.footer-contact{display:grid;gap:8px;font-size:13px}
    .footer-links a,.footer-contact a,.footer-contact span{color:#afc0d8}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-social{font-size:13px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.14);display:flex;justify-content:space-between;gap:20px;padding:18px 0;font-size:12px;color:#9eb0c9}

    @media(max-width:1050px){
      .nav-link{padding-left:8px;padding-right:8px;font-size:13px}
      .header-inner{gap:14px}
    }
    @media(max-width:820px){
      .container{width:min(100% - 28px,680px)}
      .topbar-inner{height:auto;padding:8px 0;display:block}
      .topbar-contact{gap:14px;margin-top:3px;flex-wrap:wrap}
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{min-height:68px}
      .mega-menu,.dropdown-panel{display:none}
      .tool-detail-page{padding:30px 0 55px}
      .tool-layout{grid-template-columns:1fr}
      .tool-side-card{position:static}
      .footer-main{grid-template-columns:1fr 1fr;gap:28px}
    }
    @media(max-width:560px){
      .header-btns{gap:5px}
      .header-btns>.open-account{padding:8px 10px;font-size:12px}
      .logo{font-size:16px}
      .logo img{width:32px;height:32px}
      .tool-main-card{padding:22px 17px}
      .tool-heading{align-items:flex-start;gap:13px}
      .tool-icon{width:58px;height:58px;padding:8px;border-radius:13px}
      .tool-heading h1{font-size:23px}
      .tool-content{font-size:15px}
      .footer-main{grid-template-columns:1fr;padding:34px 0 28px}
      .footer-bottom{display:block;line-height:2}
    }