:root{
  --theme:#0B3D91;
  --theme-dark:#08295f;
  --ink:#14213d;
  --muted:#667085;
  --line:#e4e9f2;
  --soft:#f4f7fb;
  --white:#fff;
  --shadow:0 16px 45px rgba(21,46,87,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#f7f9fc;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:#071b3d;color:#cbd8ef;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:#dce7f8}
.header{position:relative;z-index:20;background:var(--white);border-bottom:1px solid var(--line)}
.header-inner{height:76px;display:flex;align-items:center;gap:30px}
.logo{display:flex;align-items:center;gap:10px;min-width:180px;font-weight:800;color:var(--theme);font-size:20px}
.logo img{width:34px;height:34px;object-fit:contain}
.main-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:4px;margin:0;padding:0;list-style:none}
.nav-item{position:relative}
.nav-link{display:block;padding:25px 13px;color:#263754;font-size:15px;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";display:inline-block;width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translate(-50%,8px);width:320px;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:570px}
.nav-item:after{content:"";position:absolute;left:0;right:0;height:14px;top:100%}
.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 13px;color:var(--theme);font-size:14px;font-weight:800}
.panel-list{display:grid;gap:7px}
.panel-list a{padding:5px 0;border-bottom:1px solid #eef1f6;color:#42516a;font-size:14px}
.panel-list a:hover{color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:block;padding:12px;border:1px solid #e7ebf3;border-radius:10px;background:#fbfcfe}
.mega-card:hover{border-color:#9db4da;background:#f4f8ff}
.mega-card strong{display:flex;align-items:center;gap:7px;color:#1a3158;font-size:13px}
.mega-card strong img{width:22px;height:22px;object-fit:contain}
.mega-card>img{width:24px;height:24px;object-fit:contain;margin-bottom:4px}
.mega-card small{display:block;margin-top:4px;color:#78859a;font-size:11px;line-height:1.5}
.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}
.member-btn,.open-btn{padding:8px 13px;border-radius:7px;font-size:13px;white-space:nowrap}
.member-btn{color:var(--theme);border:1px solid #b8c8e3}
.open-btn{color:#fff;background:var(--theme)}
.hamburger{display:none;width:40px;height:38px;padding:8px;border:1px solid var(--line);border-radius:7px;background:#fff;cursor:pointer}
.hamburger span{display:block;height:2px;margin:5px 0;background:var(--theme);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;z-index:40;background:rgba(4,18,43,.5);opacity:0;visibility:hidden;transition:.2s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:50;width:min(390px,88vw);padding:20px;background:#fff;overflow-y:auto;transform:translateX(100%);transition:.25s ease}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:14px;padding-bottom:18px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}
.drawer-head span{margin-right:auto}
.drawer-head a{padding:5px 12px;border-radius:5px;background:var(--theme);color:#fff;font-size:13px}
.drawer-close{border:0;background:transparent;color:#52627b;font-size:28px;cursor:pointer}
.drawer-menu{padding:10px 0}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:12px 4px;border:0;border-bottom:1px solid #edf0f5;background:none;text-align:left;color:#263754;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{display:none;padding:5px 12px;background:#f5f8fc}
.drawer-submenu.open{display:block}
.drawer-submenu a{display:block;padding:8px 0;color:#60708b;font-size:14px}
.tool-detail-page{padding:54px 0 78px}
.tool-crumbs{margin-bottom:22px;color:#8190a7;font-size:13px}
.tool-crumbs a{color:var(--theme)}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}
.tool-article,.tool-related{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.tool-article{padding:38px}
.tool-title{margin:0;color:#102d61;font-size:clamp(28px,4vw,44px);line-height:1.25}
.tool-meta{display:flex;flex-wrap:wrap;gap:9px 20px;margin:18px 0 28px;padding-bottom:18px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}
.tool-intro{padding:18px 20px;border-left:4px solid var(--theme);border-radius:8px;background:#f3f7fd;color:#43536e}
.tool-icon{width:74px;height:74px;margin-bottom:18px;border-radius:16px;object-fit:contain;background:#eef4ff;padding:12px}
.tool-content{min-width:0;max-width:100%;overflow-x:auto;margin-top:30px;color:#35445d}
.tool-content h2,.tool-content h3{color:#102d61;margin-top:28px}
.tool-content p{margin:0 0 16px}
.tool-content img,.tool-content table{max-width:100%}
.tool-content table{border-collapse:collapse}
.tool-content th,.tool-content td{padding:8px 12px;border:1px solid var(--line)}
.tool-related{padding:24px}
.tool-related h2{margin:0 0 16px;font-size:20px;color:#102d61}
.related-tool{display:grid;grid-template-columns:44px 1fr;gap:11px;padding:14px 0;border-bottom:1px solid var(--line)}
.related-tool:last-child{border-bottom:0}
.related-tool img{width:44px;height:44px;padding:7px;object-fit:contain;border-radius:10px;background:#f1f5fb}
.related-tool strong{display:block;color:#263d67;font-size:14px}
.related-tool p{margin:3px 0 0;color:#78859a;font-size:12px;line-height:1.5}
.footer{padding:52px 0 20px;background:#071b3d;color:#c6d2e5}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:35px}
.footer h3{margin:0 0 13px;color:#fff;font-size:15px}
.footer-brand strong{display:block;margin-bottom:12px;color:#fff;font-size:21px}
.footer p{margin:7px 0;color:#aebdd3;font-size:13px}
.footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#aebdd3;font-size:13px}
.footer-grid a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);font-size:12px;color:#91a3bf}
@media(max-width:1000px){
  .main-nav{display:none}
  .hamburger{display:block}
  .header-btns{margin-left:auto}
  .tool-layout{grid-template-columns:1fr}
  .tool-related{display:grid;grid-template-columns:repeat(2,1fr);gap:0 20px}
  .tool-related h2{grid-column:1/-1}
}
@media(max-width:650px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:7px 0}
  .topbar a{margin:0 14px 0 0}
  .header-inner{height:66px;gap:10px}
  .logo{min-width:0;font-size:17px}
  .logo img{width:29px;height:29px}
  .member-btn{display:none}
  .open-btn{padding:7px 9px;font-size:12px}
  .tool-detail-page{padding:30px 0 52px}
  .tool-article{padding:23px 18px}
  .tool-related{display:block;padding:20px}
  .tool-title{font-size:30px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}
  .footer-brand{grid-column:1/-1}
  .footer-bottom{display:block}
  .footer-bottom span{display:block;margin-top:5px}
}