:root{
      --primary:#0B3D91;
      --primary-dark:#082b68;
      --ink:#18263b;
      --muted:#65748a;
      --line:#e3e9f2;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 16px 42px rgba(20,48,91,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;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:0 auto}
    .topbar{background:#102442;color:#dce7f7;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-links{display:flex;gap:22px}
    .topbar a:hover{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:34px}
    .logo{display:flex;align-items:center;gap:10px;min-width:190px;color:var(--primary);font-size:20px;font-weight:800}
    .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;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:block;padding:27px 14px;color:#293950;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .has-arrow:after{content:"⌄";margin-left:6px;font-size:12px}
    .dropdown-panel,.mega-menu{position:absolute;top:100%;left:50%;transform:translateX(-50%);display:none;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);padding:22px;z-index:30}
    .dropdown-panel{width:270px}
    .dropdown-panel a{display:block;padding:9px 6px;border-bottom:1px solid #eef2f7;font-size:14px}
    .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{display:block}
    .mega-section-title{margin:0 0 14px;color:var(--primary);font-weight:800;font-size:15px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;padding:11px;border:1px solid var(--line);border-radius:11px;background:#fbfcfe}
    .mega-card:hover{border-color:#a9bfdf;background:#f3f7fd}
    .mega-card img{width:40px;height:40px;object-fit:contain;border-radius:8px}
    .mega-card span{min-width:0}
    .mega-card strong,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card strong{font-size:13px}
    .mega-card small{color:var(--muted);font-size:11px}
    .mega-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}
    .mega-links a{padding:7px 11px;border-radius:20px;background:#edf3fb;color:var(--primary);font-size:12px}
    .header-btns{display:flex;align-items:center;gap:15px}
    .member-btn{padding:10px 16px;border-radius:9px;background:var(--primary);color:#fff;font-size:14px;font-weight:700}
    .member-btn:hover{background:var(--primary-dark)}
    .hamburger{display:none;width:42px;height:38px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--primary);transition:.2s}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;z-index:60;box-shadow:-12px 0 34px rgba(0,0,0,.18);transition:right .25s ease}
    .mobile-drawer.open{right:0}
    .drawer-overlay{position:fixed;inset:0;background:rgba(7,22,42,.48);opacity:0;visibility:hidden;z-index:50;transition:.25s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);font-weight:800;color:var(--primary)}
    .drawer-head>a{margin-left:auto;color:var(--primary);font-size:14px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;cursor:pointer;color:var(--muted)}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--primary)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 7px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;background:#102442;color:#dbe6f5}
    .footer .container{padding:48px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer h3{margin:0 0 14px;color:#fff;font-size:15px}
    .footer-brand strong{font-size:22px;color:#fff}
    .footer p{margin:10px 0;color:#aebed3;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#b8c7da;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:36px;padding-top:18px;border-top:1px solid rgba(255,255,255,.15);font-size:12px;color:#9fb1c9}
    .tool-detail-page{padding:48px 0 10px;background:linear-gradient(180deg,#f6f9fd 0,#fff 70%)}
    .tool-breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:25px}
    .tool-breadcrumb a{color:var(--primary)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}
    .tool-main,.tool-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .tool-main{padding:34px}
    .tool-heading{display:flex;gap:20px;align-items:center;padding-bottom:25px;border-bottom:1px solid var(--line)}
    .tool-heading img{width:78px;height:78px;padding:13px;object-fit:contain;border-radius:18px;background:#edf3fb}
    .tool-heading h1{margin:0 0 6px;color:var(--primary-dark);font-size:clamp(26px,4vw,40px);line-height:1.25}
    .tool-heading p{margin:0;color:var(--muted)}
    .tool-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .tool-meta span{padding:5px 11px;border-radius:30px;background:#f0f4f9;color:var(--muted);font-size:12px}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px}
    .tool-content h2,.tool-content h3{color:var(--primary-dark);line-height:1.35}
    .tool-content img,.tool-content table{max-width:100%}
    .tool-content table{border-collapse:collapse}
    .tool-content td,.tool-content th{padding:9px 12px;border:1px solid var(--line)}
    .tool-side{display:grid;gap:18px}
    .tool-side-card{padding:22px}
    .tool-side-card h2{margin:0 0 15px;font-size:18px;color:var(--primary-dark)}
    .tool-info{display:grid;gap:10px;margin:0}
    .tool-info div{display:flex;justify-content:space-between;gap:12px;padding-bottom:9px;border-bottom:1px solid #edf1f6;font-size:13px}
    .tool-info dt{color:var(--muted)}
    .tool-info dd{margin:0;text-align:right;color:var(--ink)}
    .related-tool{display:flex;gap:11px;padding:11px 0;border-bottom:1px solid #edf1f6}
    .related-tool:last-child{border-bottom:0}
    .related-tool img{width:42px;height:42px;object-fit:contain;border-radius:9px;background:#f0f4fa}
    .related-tool strong{display:block;font-size:13px}
    .related-tool small{display:block;color:var(--muted);font-size:11px;line-height:1.5}
    .tool-action{display:inline-block;margin-top:18px;padding:11px 18px;border-radius:9px;background:var(--primary);color:#fff;font-weight:700;font-size:14px}
    @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{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;padding:8px 0;flex-direction:column;gap:2px}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:68px}
      .logo{min-width:0;font-size:17px}
      .logo img{width:32px;height:32px}
      .member-btn{display:none}
      .tool-detail-page{padding-top:28px}
      .tool-main{padding:22px 18px}
      .tool-heading{align-items:flex-start;flex-direction:column}
      .tool-heading img{width:64px;height:64px}
      .tool-side{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{flex-direction:column;gap:5px}
    }