:root{
  --theme:#0B3D91;
  --ink:#17233d;
  --muted:#64748b;
  --line:#e5eaf2;
  --paper:#f6f8fc;
  --white:#fff;
  --gold:#d59b45;
  --shadow:0 18px 50px rgba(19,39,76,.1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);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:auto}
.topbar{background:#102448;color:#dfe9fb;font-size:13px}
.topbar .container{height:36px;display:flex;align-items:center;justify-content:space-between}
.topbar a{color:#fff}
.header{position:relative;background:#fff;border-bottom:1px solid var(--line);z-index:20}
.header-inner{height:78px;display:flex;align-items:center;gap:34px}
.logo{display:flex;align-items:center;gap:10px;min-width:180px;font-weight:800;color:var(--theme);font-size:20px}
.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;list-style:none;padding:0;margin:0}
.nav-item{position:relative}
.nav-link{display:block;padding:27px 14px;font-size:15px;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8b99ad}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:330px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
.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}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.panel-title{font-weight:800;color:var(--theme);margin-bottom:12px}
.dropdown-panel>a,.mega-list>a:not(.mega-card){display:block;padding:7px 0;border-bottom:1px solid #eef1f6;font-size:14px}
.mega-grid{display:grid;grid-template-columns:1.5fr .9fr;gap:22px}
.mega-list{display:grid;gap:8px}
.mega-card{display:flex;gap:10px;padding:8px;border-radius:9px}
.mega-card:hover{background:#f1f5fb}
.mega-card img{width:42px;height:42px;object-fit:cover;border-radius:8px;background:#edf2fa;flex:none}
.mega-card span{display:grid;gap:1px;min-width:0}
.mega-card b{font-size:13px}
.mega-card small{font-size:11px;color:var(--muted);line-height:1.4}
.mega-footer{display:inline-block;margin-top:15px;color:var(--theme);font-weight:700;font-size:13px}
.header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
.member-link{color:var(--theme);font-size:13px;font-weight:700}
.open-link{background:var(--theme);color:#fff;padding:8px 15px;border-radius:7px;font-size:13px}
.hamburger{display:none;border:0;background:none;padding:8px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;background:var(--ink);margin:4px 0;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(8,20,43,.55);z-index:40}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;right:0;top:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:41;transform:translateX(100%);transition:.25s;overflow:auto;box-shadow:-12px 0 40px rgba(0,0,0,.16)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{height:72px;padding:0 20px;display:flex;align-items:center;gap:15px;border-bottom:1px solid var(--line);font-weight:700}
.drawer-head>a{margin-left:auto;color:var(--theme)}
.drawer-close{border:0;background:none;font-size:28px;color:var(--muted);cursor:pointer}
.drawer-menu{padding:12px 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:var(--ink);cursor:pointer}
.drawer-group .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
.drawer-group .drawer-toggle.active:after{content:"－"}
.drawer-submenu{display:none;padding:5px 0 8px 15px}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
.tool-detail-page{padding:54px 0 80px}
.tool-detail-page .crumbs{font-size:13px;color:var(--muted);margin-bottom:22px}
.tool-detail-page .crumbs a{color:var(--theme)}
.tool-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
.tool-main-card,.tool-side-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 10px 35px rgba(20,42,80,.06)}
.tool-main-card{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;border-radius:16px;background:#eef4ff;padding:10px;flex:none}
.tool-heading h1{margin:0 0 8px;color:#132b59;font-size:32px;line-height:1.25}
.tool-heading p{margin:0;color:var(--muted)}
.tool-meta{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}
.tool-meta span{background:#f0f5ff;color:var(--theme);border-radius:30px;padding:5px 12px;font-size:13px}
.tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:8px}
.tool-content h2,.tool-content h3{color:#17366f;margin-top:30px}
.tool-content img,.tool-content table{max-width:100%}
.tool-content table{display:block;overflow-x:auto}
.tool-content pre{max-width:100%;overflow:auto;background:#101d35;color:#dce8ff;padding:18px;border-radius:10px}
.tool-side-card{padding:22px;position:sticky;top:20px}
.tool-side-card h2{font-size:18px;margin:0 0 15px}
.related-tool{display:flex;gap:10px;padding:12px 0;border-bottom:1px solid #edf0f5}
.related-tool img{width:42px;height:42px;border-radius:9px;object-fit:contain;background:#f0f4fa}
.related-tool b{display:block;font-size:14px}
.related-tool small{display:block;color:var(--muted);font-size:12px;line-height:1.45}
.tool-side-note{margin-top:20px;padding:14px;background:#fff8ec;border-left:3px solid var(--gold);font-size:13px;color:#795421}
.footer{background:#101f3d;color:#cfdbef;padding:48px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1.2fr;gap:35px}
.footer h3{font-size:15px;color:#fff;margin:0 0 14px}
.footer p{margin:7px 0;font-size:13px;color:#aebdd4}
.footer a{display:block;color:#c8d5e9;font-size:13px;margin:7px 0}
.footer-brand strong{font-size:21px;color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:17px;color:#9eafc9;font-size:12px}
@media(max-width:1000px){
  .main-nav{display:none}
  .header-inner{height:68px}
  .hamburger{display:block}
  .member-link{display:none}
  .mega-menu{display:none}
  .tool-detail-layout{grid-template-columns:1fr}
  .tool-side-card{position:static}
}
@media(max-width:700px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container{height:auto;min-height:36px;padding:7px 0;display:block}
  .topbar .contact{display:block}
  .header-btns{gap:7px}
  .open-link{padding:7px 10px}
  .tool-detail-page{padding:32px 0 55px}
  .tool-main-card{padding:22px 18px}
  .tool-heading{gap:13px}
  .tool-icon{width:58px;height:58px}
  .tool-heading h1{font-size:25px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
}
@media(max-width:460px){
  .footer-grid{grid-template-columns:1fr}
}