:root{
  --theme:#0B3D91;
  --theme-dark:#082d6b;
  --ink:#14213d;
  --muted:#667085;
  --line:#dfe5ee;
  --soft:#f4f7fb;
  --white:#fff;
  --accent:#f4b942;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#f7f9fc;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",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:0 auto}

.topbar{background:#071d43;color:#dce8ff;font-size:13px}
.topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.top-contact{display:flex;gap:20px}
.top-contact a:hover{color:#fff}

.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 12px rgba(9,35,78,.05)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;font-weight:800;color:var(--theme);font-size:19px}
.logo img{width:38px;height:38px;object-fit:contain;border-radius:9px}
.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:flex;align-items:center;gap:5px;padding:26px 13px;color:#24324b;font-size:14px;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{color:var(--theme)}
.has-arrow:after{content:"⌄";font-size:12px;color:#8290a8}
.dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(8px);width:300px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 38px rgba(11,61,145,.14);padding:14px;opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
.mega-menu{width:680px;padding:22px}
.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;pointer-events:auto;transform:translateX(-50%) translateY(0)}
.dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
.drop-item{display:block;padding:9px 11px;border-radius:8px;font-size:13px}
.drop-item:hover{background:var(--soft);color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:25px}
.mega-title{margin:0 0 10px;color:var(--theme);font-size:13px;font-weight:800}
.mega-card{display:grid;grid-template-columns:28px 1fr;gap:2px 9px;padding:8px 9px;border-radius:9px}
.mega-card:hover{background:var(--soft)}
.mega-card img{width:24px;height:24px;object-fit:contain;grid-row:span 2}
.mega-card strong{font-size:13px;font-weight:700}
.mega-card small,.meta{font-size:11px;color:var(--muted);line-height:1.55}
.mega-footer{display:inline-block;margin-top:12px;padding:8px 12px;border-radius:7px;background:var(--theme);color:#fff;font-size:12px}
.header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
.member-btn,.account-btn{padding:8px 12px;border-radius:7px;font-size:13px}
.member-btn{color:var(--theme);border:1px solid #b8c9e6}
.account-btn{background:var(--theme);color:#fff}
.member-btn:hover{background:#eef4ff}
.account-btn:hover{background:var(--theme-dark)}
.hamburger{display:none;width:40px;height:38px;border:0;background:transparent;padding:8px;cursor:pointer}
.hamburger span{display:block;width:23px;height:2px;background:var(--theme);margin:5px auto;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(3,18,42,.48);opacity:0;visibility:hidden;z-index:40;transition:.2s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:41;transform:translateX(100%);transition:.25s ease;overflow-y:auto;box-shadow:-15px 0 35px rgba(0,0,0,.16)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:12px;padding:20px;border-bottom:1px solid var(--line);font-weight:800;color:var(--theme)}
.drawer-head a{margin-left:auto;padding:5px 10px;background:var(--theme);color:#fff;border-radius:5px;font-size:12px}
.drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:#78859b;cursor:pointer}
.drawer-menu{padding:12px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 3px;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;font:inherit;font-size:14px;color:var(--ink);cursor:pointer}
.drawer-group{border-bottom:1px solid #edf0f5}
.drawer-toggle:after{content:"＋";float:right;color:#8290a8}
.drawer-toggle.active{color:var(--theme)}
.drawer-toggle.active:after{content:"－"}
.drawer-submenu{max-height:0;overflow:hidden;transition:max-height .25s ease;padding-left:13px}
.drawer-submenu.open{max-height:500px}
.drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:13px}

.tool-detail-page{padding:58px 0 80px}
.tool-crumb{font-size:13px;color:var(--muted);margin-bottom:22px}
.tool-crumb a{color:var(--theme)}
.tool-hero{background:linear-gradient(135deg,#fff 0%,#eef4ff 100%);border:1px solid #dce6f5;border-radius:22px;padding:38px;display:flex;align-items:center;gap:25px;margin-bottom:28px}
.tool-icon-wrap{width:82px;height:82px;flex:0 0 82px;border-radius:20px;background:#fff;display:grid;place-items:center;box-shadow:0 10px 26px rgba(11,61,145,.1)}
.tool-icon-wrap img{width:54px;height:54px;object-fit:contain}
.tool-hero h1{margin:0 0 7px;font-size:clamp(28px,4vw,44px);line-height:1.2;letter-spacing:-1px}
.tool-hero p{margin:0;color:var(--muted);font-size:16px}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 315px;gap:28px;align-items:start}
.tool-main-card,.tool-side-card{background:#fff;border:1px solid var(--line);border-radius:18px}
.tool-main-card{padding:34px}
.tool-side-card{padding:22px;position:sticky;top:20px}
.tool-main-card h2{font-size:22px;margin:0 0 18px;padding-bottom:12px;border-bottom:2px solid var(--theme)}
.tool-main-card h3{font-size:18px;margin:27px 0 10px;color:var(--theme)}
.tool-content{min-width:0;max-width:100%;overflow-x:auto;color:#344054;font-size:15px}
.tool-content p{margin:0 0 16px}
.tool-content ul,.tool-content ol{padding-left:24px}
.tool-content img,.tool-content table{max-width:100%}
.tool-meta{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0 30px}
.meta-item{background:var(--soft);border-radius:10px;padding:12px 14px}
.meta-item span{display:block;color:var(--muted);font-size:12px}
.meta-item strong{font-size:14px}
.tool-action{display:inline-block;background:var(--theme);color:#fff;border-radius:8px;padding:11px 22px;font-size:14px;font-weight:700}
.tool-action:hover{background:var(--theme-dark)}
.tool-side-card h2{margin:0 0 15px;font-size:18px;color:var(--theme)}
.related-tool{display:grid;grid-template-columns:42px 1fr;gap:10px;padding:12px 0;border-top:1px solid #edf0f5}
.related-tool img{width:42px;height:42px;object-fit:contain;border-radius:9px;background:var(--soft)}
.related-tool strong{display:block;font-size:14px}
.related-tool p{margin:2px 0 0;color:var(--muted);font-size:12px;line-height:1.5}
.side-note{margin-top:18px;padding:14px;border-radius:10px;background:#fff8e7;color:#795d1a;font-size:12px}

.footer{background:#071d43;color:#d3def1;padding:50px 0 18px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:35px}
.footer h3{margin:0 0 14px;color:#fff;font-size:16px}
.footer p{margin:0 0 9px;font-size:13px;line-height:1.8}
.footer-grid a{display:block;margin:6px 0;color:#d3def1;font-size:13px}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:35px;padding-top:16px;color:#9eb1d0;font-size:12px}

@media(max-width:980px){
  .main-nav{display:none}
  .hamburger{display:block}
  .header-inner{justify-content:space-between}
  .tool-layout{grid-template-columns:1fr}
  .tool-side-card{position:static}
}
@media(max-width:680px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container{align-items:flex-start;padding:8px 0;flex-direction:column;gap:2px}
  .top-contact{gap:12px;flex-wrap:wrap}
  .header-inner{min-height:66px;gap:10px}
  .logo{font-size:16px}
  .logo img{width:32px;height:32px}
  .member-btn{display:none}
  .tool-detail-page{padding:35px 0 55px}
  .tool-hero{padding:25px 20px;display:block;text-align:center}
  .tool-icon-wrap{margin:0 auto 18px}
  .tool-hero h1{font-size:30px}
  .tool-hero p{font-size:14px}
  .tool-main-card{padding:22px 18px}
  .tool-meta{grid-template-columns:1fr}
  .footer{padding-top:35px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
}
@media(max-width:430px){
  .footer-grid{grid-template-columns:1fr}
  .account-btn{display:none}
}