:root{
      --blue:#0B3D91;
      --blue-dark:#082b67;
      --ink:#172033;
      --muted:#647089;
      --line:#e4e9f1;
      --soft:#f4f7fb;
      --white:#fff;
      --accent:#d59a34;
      --shadow:0 16px 44px rgba(18,42,83,.11);
    }
    *{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:#071f49;color:#cdd9ef;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{margin-left:20px;color:#fff}
    .header{position:relative;z-index:20;background:#fff;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;color:var(--blue);font-size:20px;font-weight:800;white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:76px;padding:0 15px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-visible{color:var(--blue)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:0 0 3px 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:300px;padding:20px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s}
    .mega-menu{width:470px}
    .nav-item:hover .dropdown-panel,.nav-item:focus-within .dropdown-panel,.nav-item:hover .mega-menu,.nav-item:focus-within .mega-menu{opacity:1;visibility:visible;transform:translate(-50%,0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}
    .mega-title{margin:0 0 12px;color:var(--blue);font-weight:800}
    .mega-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
    .broker-mini,.video-mini,.product-mini{display:block;padding:11px;border:1px solid var(--line);background:#fbfcfe}
    .mega-grid a:hover{border-color:#a9bddd;background:#f3f7ff}
    .mega-grid strong,.mega-grid small{display:block}
    .mega-grid strong{font-size:13px}
    .mega-grid small{color:var(--muted);font-size:11px;line-height:1.5;margin-top:3px}
    .product-mini{display:grid;grid-template-columns:30px 1fr;column-gap:8px}
    .product-mini img{width:30px;height:30px;object-fit:contain;grid-row:span 2}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--blue);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{color:var(--blue);font-size:13px}
    .open-btn{padding:8px 16px;background:var(--blue);color:#fff;font-size:13px;border-radius:4px}
    .hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:4px;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--blue);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
    .drawer-overlay{display:none;position:fixed;inset:0;z-index:40;background:rgba(5,20,45,.48)}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;z-index:50;top:0;right:0;width:min(360px,88vw);height:100vh;padding:22px;background:#fff;overflow:auto;transform:translateX(100%);transition:.25s;box-shadow:-15px 0 40px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:14px;padding-bottom:18px;border-bottom:1px solid var(--line)}
    .drawer-head strong{flex:1;color:var(--blue)}
    .drawer-head a{padding:6px 12px;background:var(--blue);color:#fff;font-size:13px;border-radius:4px}
    .drawer-close{border:0;background:none;color:var(--muted);font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding-top:12px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 4px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--blue);font-size:18px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px;background:var(--soft)}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 4px;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#081e43;color:#cbd6e9}
    .footer .container{padding:50px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:35px}
    .footer strong,.footer h3{color:#fff}
    .footer h3{margin:0 0 12px;font-size:15px}
    .footer p{margin:6px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:6px 0;font-size:13px}
    .footer-brand strong{font-size:20px}
    .footer-bottom{margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.16);font-size:12px;text-align:center}
    .tool-detail-page{background:linear-gradient(180deg,#f4f7fb 0,#fff 430px);padding:58px 0 0}
    .tool-detail-page .breadcrumb{color:var(--muted);font-size:13px;margin-bottom:24px}
    .tool-detail-page .breadcrumb a{color:var(--blue)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:28px;align-items:start}
    .tool-main,.tool-sidebar{background:#fff;border:1px solid var(--line);box-shadow:0 8px 28px rgba(18,42,83,.06)}
    .tool-main{min-width:0;padding:38px}
    .tool-heading{display:flex;gap:20px;align-items:flex-start;padding-bottom:26px;border-bottom:1px solid var(--line)}
    .tool-icon{width:76px;height:76px;flex:0 0 76px;object-fit:contain;border:1px solid var(--line);padding:10px;background:#f7faff}
    .tool-heading h1{margin:0;color:var(--blue-dark);font-size:clamp(28px,4vw,42px);line-height:1.25}
    .tool-intro{margin:9px 0 0;color:var(--muted)}
    .tool-meta{display:flex;flex-wrap:wrap;gap:12px 22px;margin:20px 0;color:var(--muted);font-size:13px}
    .tool-meta strong{color:var(--ink)}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:22px}
    .tool-content img,.tool-content table{max-width:100%}
    .tool-content h2,.tool-content h3{color:var(--blue-dark);margin-top:28px}
    .tool-content a{color:var(--blue);text-decoration:underline}
    .tool-sidebar{padding:24px}
    .tool-sidebar h2{margin:0 0 16px;color:var(--blue-dark);font-size:19px}
    .related-tool{display:grid;grid-template-columns:44px 1fr;gap:11px;padding:14px 0;border-top:1px solid var(--line)}
    .related-tool img{width:44px;height:44px;object-fit:contain;padding:5px;border:1px solid var(--line)}
    .related-tool strong{display:block;font-size:14px}
    .related-tool small{display:block;color:var(--muted);font-size:12px;line-height:1.5;margin-top:3px}
    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .member-btn{display:none}
      .tool-layout{grid-template-columns:1fr}
      .tool-sidebar{order:2}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:600px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:0;padding:8px 0}
      .topbar a{margin:0 14px 0 0}
      .header-inner{height:66px;gap:10px}
      .nav-link{height:66px}
      .logo{font-size:17px}
      .open-btn{padding:7px 11px}
      .tool-detail-page{padding-top:32px}
      .tool-main{padding:22px 18px}
      .tool-heading{gap:14px}
      .tool-icon{width:58px;height:58px;flex-basis:58px}
      .tool-heading h1{font-size:27px}
      .footer{margin-top:48px}
      .footer .container{padding-top:35px}
      .footer-grid{grid-template-columns:1fr;gap:24px}
    }