:root{
      --theme:#0B3D91;
      --ink:#142033;
      --muted:#6b778c;
      --line:#e5eaf1;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 18px 55px rgba(20,42,75,.10);
      --radius:16px
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f8fafc;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:auto}
    .topbar{background:#091a35;color:#c8d5e8;font-size:13px}
    .topbar-inner{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:20px}
    .topbar a:hover{color:#fff}
    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:inline-flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;color:#102443}
    .logo img{width:38px;height:38px;object-fit:contain}
    .logo span{font-size:18px}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 13px;font-size:14px;color:#30415a;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8a96a8}
    .dropdown-panel,.mega-menu{
      position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);
      width:330px;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 ease
    }
    .mega-menu{width:780px}
    .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}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-title,.mega-head strong{display:block;margin:0;color:#132847;font-size:16px}
    .mega-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:15px}
    .mega-head span{font-size:12px;color:var(--muted)}
    .dropdown-list{display:grid;gap:10px;margin:15px 0}
    .dropdown-list a{font-size:13px;color:#42536b;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .dropdown-list a:hover,.footer-links a:hover{color:var(--theme)}
    .dropdown-more,.mega-footer{display:flex;justify-content:space-between;color:var(--theme);font-size:13px;border-top:1px solid var(--line);padding-top:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{padding:12px;border:1px solid var(--line);border-radius:11px;background:#fbfcfe;transition:.2s}
    .mega-card:hover{border-color:#a9c1e9;transform:translateY(-2px)}
    .mega-card img{width:32px;height:32px;object-fit:contain;margin-bottom:8px}
    .mega-card img.cover{width:100%;height:80px;object-fit:cover;border-radius:7px}
    .mega-card strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card p{margin:4px 0;font-size:11px;line-height:1.5;color:var(--muted)}
    .mega-meta{display:flex;flex-wrap:wrap;gap:5px 10px;color:#718096;font-size:10px}
    .mega-categories{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:15px}
    .mega-categories a{padding:4px 9px;background:#eef4fc;border-radius:20px;color:var(--theme);font-size:11px}
    .header-btns{display:flex;align-items:center;gap:13px}
    .member-entry{font-size:13px;color:var(--theme)}
    .account-entry{padding:8px 15px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px}
    .hamburger{display:none;width:40px;height:40px;padding:9px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--ink);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(4,17,37,.5);opacity:0;visibility:hidden;z-index:50;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:51;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.25s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:74px;display:flex;align-items:center;gap:18px;padding:0 22px;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:30px;color:#68758a;cursor:pointer}
    .drawer-menu{padding:10px 22px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:#253752;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:#8996aa}
    .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:#65738a;font-size:13px}
    .footer{margin-top:70px;background:#0a1931;color:#bdc9da}
    .footer-main{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:42px;padding:54px 0}
    .footer .logo{color:#fff;margin-bottom:14px}
    .footer-brand p{max-width:310px;color:#94a4bb;font-size:13px;margin:0}
    .footer h3{font-size:14px;color:#fff;margin:3px 0 16px}
    .footer-links,.footer-contact{display:grid;gap:9px;font-size:13px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.1)}
    .footer-bottom-inner{display:flex;justify-content:space-between;gap:20px;padding:17px 0;color:#8798b0;font-size:12px}
    .tool-detail-page{padding:52px 0 0}
    .crumbs{font-size:13px;color:#7a8799;margin-bottom:25px}
    .crumbs a{color:var(--theme)}
    .tool-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start}
    .tool-main,.tool-sidebar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 28px rgba(26,49,83,.05)}
    .tool-main{padding:34px}
    .tool-heading{display:flex;gap:20px;align-items:flex-start;padding-bottom:25px;border-bottom:1px solid var(--line)}
    .tool-icon{width:76px;height:76px;object-fit:contain;flex:0 0 76px;border-radius:14px;background:#edf3fc;padding:12px}
    .tool-heading h1{margin:0 0 8px;font-size:30px;line-height:1.3;color:#102747}
    .tool-heading p{margin:0;color:var(--muted);font-size:14px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:10px 20px;margin:22px 0;color:#68778d;font-size:13px}
    .tool-meta strong{color:#233a5b}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:12px;color:#394a61;font-size:15px}
    .tool-content img,.tool-content table{max-width:100%}
    .tool-content h2,.tool-content h3{color:#142f55;margin-top:28px}
    .tool-content table{border-collapse:collapse;width:100%;margin:18px 0}
    .tool-content td,.tool-content th{border:1px solid var(--line);padding:10px;text-align:left}
    .tool-content blockquote{margin:20px 0;padding:14px 18px;border-left:4px solid var(--theme);background:#f2f6fc;color:#52627a}
    .tool-sidebar{padding:23px;position:sticky;top:20px}
    .tool-sidebar h2{font-size:17px;margin:0 0 17px;color:#162d4d}
    .related-tool{display:grid;grid-template-columns:46px 1fr;gap:11px;padding:14px 0;border-top:1px solid var(--line)}
    .related-tool img{width:46px;height:46px;object-fit:contain;border-radius:9px;background:#f0f4fa;padding:7px}
    .related-tool strong{display:block;font-size:13px;color:#253d60}
    .related-tool p{margin:3px 0 0;color:var(--muted);font-size:11px;line-height:1.5}
    .tool-back{display:inline-flex;margin-top:22px;padding:10px 16px;background:#edf3fc;border-radius:8px;color:var(--theme);font-size:13px}
    @media(max-width:1050px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .footer-main{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:720px){
      .container{width:min(100% - 28px,560px)}
      .topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:3px}
      .topbar-contact{gap:12px;flex-wrap:wrap}
      .header-inner{height:68px;gap:10px}
      .logo span{font-size:16px}
      .member-entry{display:none}
      .tool-detail-page{padding-top:30px}
      .tool-detail-layout{display:block}
      .tool-main{padding:21px}
      .tool-heading h1{font-size:24px}
      .tool-heading{gap:13px}
      .tool-icon{width:58px;height:58px;flex-basis:58px}
      .tool-sidebar{position:static;margin-top:20px}
      .footer-main{grid-template-columns:1fr;gap:28px;padding:38px 0}
      .footer-bottom-inner{display:block;line-height:2}
    }