:root{--theme:#0B3D91;--ink:#15243b;--muted:#64748b;--line:#dbe5f0;--mist:#eef5fb;--white:#fff;--shadow:0 18px 55px rgba(15,45,80,.12)}
*{box-sizing:border-box}
html,body{margin:0;padding:0;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#f7faff}
body{line-height:1.65}
a{color:inherit;text-decoration:none}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.topbar{background:#092e6f;color:#dceaff;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
.topbar a{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:28px}
.logo{display:flex;align-items:center;gap:10px;white-space:nowrap;color:var(--theme);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-list>li{position:relative}
.nav-link{display:block;padding:27px 13px;color:#263a54;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:#7890aa}
.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:310px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
.mega-menu{width:650px}
.nav-list>li:hover .dropdown-panel,.nav-list>li:focus-within .dropdown-panel,.nav-list>li:hover .mega-menu,.nav-list>li:focus-within .mega-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.drop-title,.mega-title{margin:0 0 12px;color:var(--theme);font-weight:800}
.drop-item{display:block;padding:9px 0;border-bottom:1px solid #edf2f7;font-size:14px}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:block;padding:12px;border:1px solid #e3ebf4;border-radius:9px;background:#fbfdff}
.mega-card:hover{border-color:#9ab8df;background:#f2f7fd}
.mega-card img{float:left;margin:1px 9px 7px 0;object-fit:contain}
.mega-card strong,.mega-card small{display:block}
.mega-card strong{font-size:14px}
.mega-card small{font-size:12px;color:var(--muted);margin-top:4px}
.mega-footer{display:inline-block;margin:14px 12px 0 0;color:var(--theme);font-size:13px}
.header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap;font-size:14px}
.open-account{padding:9px 15px;border-radius:7px;background:var(--theme);color:#fff}
.hamburger{display:none;width:42px;height:38px;border:1px solid var(--line);background:#fff;border-radius:7px;padding:8px;cursor:pointer}
.hamburger span{display:block;height:2px;background:var(--theme);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{display:none;position:fixed;inset:0;background:rgba(7,26,54,.48);z-index:50}
.drawer-overlay.open{display:block}
.mobile-drawer{position:fixed;right:0;top:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:51;transform:translateX(100%);transition:.25s;overflow:auto}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
.drawer-head>a{margin-left:auto;padding:7px 12px;background:var(--theme);color:#fff;border-radius:6px;font-size:13px}
.drawer-close{border:0;background:none;font-size:28px;color:var(--muted);cursor:pointer}
.drawer-menu{padding:10px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf2f7;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:5px 0 8px 14px}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
.footer{margin-top:70px;padding:46px 0 20px;background:#102746;color:#d7e4f3}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:35px}
.footer h3,.footer h4{margin:0 0 14px;color:#fff}
.footer p{margin:7px 0;color:#aec2d9;font-size:14px}
.footer-grid a{display:block;margin:8px 0;color:#c7d8eb;font-size:14px}
.footer-grid a:hover{color:#fff}
.footer-bottom{margin-top:32px;padding-top:18px;border-top:1px solid rgba(255,255,255,.16);font-size:13px;color:#9fb5ce}
.tool-detail-page{padding-top:0}
.tool-detail-page .page-crumb{padding:24px 0 8px;color:var(--muted);font-size:13px}
.tool-detail-page .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start;padding:14px 0 25px}
.tool-detail-page .tool-article,.tool-detail-page .related-tools{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 30px rgba(27,61,96,.06)}
.tool-detail-page .tool-article{padding:34px 38px}
.tool-detail-page .tool-heading{display:flex;align-items:flex-start;gap:18px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.tool-detail-page .tool-icon{width:74px;height:74px;object-fit:contain;border:1px solid var(--line);border-radius:14px;padding:10px;background:var(--mist)}
.tool-detail-page h1{margin:0;font-size:clamp(28px,4vw,44px);line-height:1.2;color:#102b50}
.tool-detail-page .tool-summary{margin:9px 0 0;color:var(--muted);font-size:16px}
.tool-detail-page .tool-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:18px;color:#6b7e95;font-size:13px}
.tool-detail-page .tool-body{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px;color:#344b66;font-size:16px}
.tool-detail-page .tool-body img,.tool-detail-page .tool-body table{max-width:100%;height:auto}
.tool-detail-page .tool-body h2,.tool-detail-page .tool-body h3{color:#123c78}
.tool-detail-page .tool-body a{color:var(--theme);text-decoration:underline}
.tool-detail-page .related-tools{padding:24px;position:sticky;top:18px}
.tool-detail-page .related-tools h2{margin:0 0 15px;font-size:20px}
.tool-detail-page .related-item{display:grid;grid-template-columns:44px 1fr;gap:11px;padding:14px 0;border-bottom:1px solid #edf2f7}
.tool-detail-page .related-item:last-child{border-bottom:0}
.tool-detail-page .related-item img{width:44px;height:44px;object-fit:contain;border:1px solid var(--line);border-radius:9px;padding:6px}
.tool-detail-page .related-item strong{display:block;font-size:14px;color:#183b6b}
.tool-detail-page .related-item span{display:block;color:var(--muted);font-size:12px;margin-top:3px}
.tool-detail-page .tool-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
.tool-detail-page .tool-actions a{padding:10px 17px;border-radius:7px;background:var(--theme);color:#fff;font-size:14px}
.tool-detail-page .tool-actions a.secondary{background:#edf4fb;color:var(--theme)}
@media(max-width:980px){
.nav-list{gap:0}.nav-link{padding-left:8px;padding-right:8px;font-size:14px}.header-inner{gap:12px}
}
@media(max-width:760px){
.container{width:min(100% - 28px,620px)}
.topbar .container{display:block;padding:8px 0}.topbar .contact{display:block;margin-top:3px}
.header-inner{height:65px}.main-nav{display:none}.header-btns>span,.open-account{display:none}.hamburger{display:block}
.footer-grid{grid-template-columns:1fr 1fr;gap:25px}
.tool-detail-page .tool-layout{grid-template-columns:1fr;gap:18px}
.tool-detail-page .tool-article{padding:24px 20px}.tool-detail-page .related-tools{position:static}
}
@media(max-width:450px){
.footer-grid{grid-template-columns:1fr}.tool-detail-page .tool-heading{gap:12px}.tool-detail-page .tool-icon{width:58px;height:58px}.tool-detail-page h1{font-size:28px}
}