:root{
  --theme:#0B3D91;
  --ink:#172033;
  --muted:#687386;
  --line:#e5eaf1;
  --soft:#f4f7fb;
  --white:#fff;
  --accent:#d99a28;
  --shadow:0 18px 50px rgba(20,42,78,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#f7f9fc;font-family:"PingFang SC","Microsoft YaHei",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:#101a2d;color:#cdd6e5;font-size:13px}
.topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.topbar a{margin-left:22px;color:#e7edf8}
.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--theme);font-size:19px;font-weight:800;white-space:nowrap}
.logo img{width:38px;height:38px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;align-items:stretch;justify-content:center;gap:2px;padding:0;margin:0;list-style:none}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;min-height:76px;padding:0 14px;color:#28364d;font-size:14px;font-weight:600;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";width:6px;height:6px;margin:0 0 4px 8px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left: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;transform:translate(-50%,8px);transition:.2s ease}
.mega-menu{width:570px}
.nav-item:after{content:"";position:absolute;left:0;right:0;top:100%;height:12px}
.nav-item:hover .dropdown-panel,.nav-item:hover .mega-menu,.nav-item:focus-within .dropdown-panel,.nav-item:focus-within .mega-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
.panel-title{margin:0 0 14px;color:var(--theme);font-size:15px;font-weight:800}
.panel-list{display:grid;gap:8px}
.panel-list a{padding:5px 0;color:#4c5870;font-size:13px}
.panel-list a:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:flex;flex-direction:column;gap:3px;min-height:84px;padding:12px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
.mega-card:hover{border-color:#9db5d9;background:#f3f7fd}
.mega-card img{width:25px;height:25px;object-fit:contain;margin-bottom:2px}
.mega-card strong{font-size:13px;color:#20314e}
.mega-card small{color:var(--muted);font-size:11px;line-height:1.45}
.mega-footer{display:block;margin-top:16px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
.header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
.member,.open-account{padding:8px 13px;border-radius:7px;font-size:13px;font-weight:700}
.member{color:var(--theme);border:1px solid #bfd0e8}
.open-account{color:#fff;background:var(--theme)}
.hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;margin:4px auto;background:var(--theme);transition:.2s}
.drawer-overlay{display:none;position:fixed;z-index:80;inset:0;background:rgba(8,18,34,.48)}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;z-index:90;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(105%);transition:.25s ease;box-shadow:-10px 0 35px rgba(0,0,0,.16)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);font-weight:800;color:var(--theme)}
.drawer-head a{margin-left:auto;color:#fff;background:var(--theme);padding:5px 11px;border-radius:5px;font-size:13px}
.drawer-close{width:32px;height:32px;border:0;background:#eef3f9;color:#42536d;border-radius:50%;font-size:23px;line-height:1;cursor:pointer}
.drawer-menu{padding:12px 20px 40px}
.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:#26354c;font-weight:700;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{display:none;padding:7px 0 8px 15px;border-bottom:1px solid var(--line)}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}
.footer{margin-top:70px;padding:52px 0 20px;background:#111c30;color:#bcc8da}
.footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1.15fr;gap:35px}
.footer-brand{padding-right:20px}
.footer-brand img{width:42px;height:42px;object-fit:contain;margin-bottom:10px}
.footer-brand strong{display:block;color:#fff;font-size:18px}
.footer h3{margin:0 0 15px;color:#fff;font-size:15px}
.footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#bcc8da;font-size:13px}
.footer-grid a:hover{color:#fff}
.footer p{margin:9px 0;font-size:13px}
.footer-bottom{margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8e9db4}
.tool-detail-page{padding:46px 0 0}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px;color:#7a879b;font-size:13px}
.breadcrumb a{color:var(--theme)}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
.tool-article,.tool-side-card{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 8px 28px rgba(31,58,98,.05)}
.tool-article{padding:34px}
.tool-heading{display:flex;gap:20px;align-items:flex-start;padding-bottom:25px;border-bottom:1px solid var(--line)}
.tool-icon{flex:0 0 78px;width:78px;height:78px;padding:14px;border-radius:16px;background:#eef4fc;object-fit:contain}
.tool-heading h1{margin:0 0 8px;color:#142b51;font-size:32px;line-height:1.25}
.tool-heading p{margin:0;color:var(--muted);font-size:15px}
.tool-meta{display:flex;flex-wrap:wrap;gap:15px;margin-top:15px;color:#78859a;font-size:13px}
.tool-meta span{padding-right:15px;border-right:1px solid var(--line)}
.tool-meta span:last-child{border-right:0}
.tool-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px;color:#3d4a60;font-size:15px}
.tool-body h2,.tool-body h3{color:#173866;margin:28px 0 12px}
.tool-body p{margin:12px 0}
.tool-body ul,.tool-body ol{padding-left:24px}
.tool-body img,.tool-body video,.tool-body iframe{max-width:100%;height:auto}
.tool-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
.tool-body table td,.tool-body table th{padding:9px 12px;border:1px solid var(--line);white-space:nowrap}
.tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;padding-top:22px;border-top:1px solid var(--line)}
.primary-btn,.secondary-btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 20px;border-radius:8px;font-size:14px;font-weight:700}
.primary-btn{background:var(--theme);color:#fff}
.secondary-btn{border:1px solid #bfd0e8;color:var(--theme);background:#fff}
.tool-side{display:grid;gap:18px}
.tool-side-card{padding:22px}
.tool-side-card h2{margin:0 0 16px;color:#173866;font-size:18px}
.related-tool{display:grid;grid-template-columns:42px 1fr;gap:10px;padding:13px 0;border-top:1px solid var(--line)}
.related-tool:first-of-type{border-top:0}
.related-tool img{width:42px;height:42px;padding:7px;border-radius:9px;background:#f0f5fb;object-fit:contain}
.related-tool strong{display:block;color:#263c60;font-size:14px}
.related-tool small{display:block;margin-top:3px;color:var(--muted);font-size:12px;line-height:1.45}
.side-note{color:var(--muted);font-size:13px}
@media (max-width:1050px){
  .main-nav{display:none}
  .hamburger{display:block}
  .header-inner{justify-content:space-between}
}
@media (max-width:780px){
  .container{width:min(100% - 28px,620px)}
  .topbar .container{display:block;padding:8px 0}
  .topbar .container>span{display:block}
  .topbar a{margin:0 16px 0 0}
  .member{display:none}
  .open-account{padding:7px 10px}
  .tool-detail-page{padding-top:28px}
  .tool-layout{grid-template-columns:1fr}
  .tool-article{padding:22px}
  .tool-heading h1{font-size:25px}
  .tool-icon{flex-basis:62px;width:62px;height:62px;padding:10px}
  .footer{margin-top:42px;padding-top:38px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:480px){
  .header-inner{min-height:66px}
  .logo{min-width:0;font-size:16px}
  .logo img{width:32px;height:32px}
  .header-btns{gap:6px}
  .tool-heading{display:block}
  .tool-icon{margin-bottom:16px}
  .tool-meta{gap:8px}
  .tool-meta span{padding-right:8px}
  .footer-grid{grid-template-columns:1fr}
}