:root{--theme:#0B3D91;--ink:#182338;--muted:#687386;--line:#e6eaf0;--soft:#f5f7fa;--white:#fff;--accent:#d21d76}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:#f7f8fa;color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",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% - 36px));margin:auto}
    .topbar{background:#12213d;color:#dfe7f4;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between}
    .topbar-links{display:flex;gap:20px}
    .topbar a:hover{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;min-width:190px;font-size:18px;font-weight:800;color:var(--theme)}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 14px;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:12px;margin-left:6px;color:#8994a5}
    .dropdown-panel,.mega-menu{position:absolute;left:50%;top:calc(100% - 1px);transform:translateX(-50%) translateY(8px);width:320px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 45px #17233d1a;opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:650px}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .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:translateX(-50%) translateY(0)}
    .drop-title,.mega-title{margin:0 0 12px;font-size:14px;font-weight:800;color:var(--theme)}
    .drop-list{display:grid;gap:9px}
    .drop-list a{font-size:13px;padding-bottom:8px;border-bottom:1px solid var(--line)}
    .drop-list a:hover,.mega-card:hover strong{color:var(--accent)}
    .mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}
    .mega-items{display:grid;gap:9px}
    .mega-card{display:flex;align-items:center;gap:10px;padding:7px;border-radius:8px}
    .mega-card:hover{background:var(--soft)}
    .mega-card img{width:38px;height:38px;object-fit:cover;border-radius:7px;background:#eef2f7}
    .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{font-size:11px;color:var(--muted)}
    .mega-footer{display:inline-block;margin-top:15px;padding-top:12px;border-top:1px solid var(--line);width:100%;font-size:13px;color:var(--theme)}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-link{font-size:13px;color:var(--theme)}
    .open-account{background:var(--theme);color:#fff;padding:8px 15px;border-radius:7px;font-size:13px}
    .hamburger{display:none;width:40px;height:38px;border:1px solid var(--line);background:#fff;border-radius:7px;padding:8px}
    .hamburger span{display:block;height:2px;background:var(--theme);margin:4px 0;transition:.2s}
    .drawer-overlay{position:fixed;inset:0;background:#09142699;opacity:0;visibility:hidden;z-index:50;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;background:#fff;z-index:51;overflow:auto;transition:.25s;box-shadow:-8px 0 30px #13213d26}
    .mobile-drawer.open{right:0}
    .drawer-head{height:70px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-weight:700}
    .drawer-head a{color:var(--theme);margin-left:auto;margin-right:15px}
    .drawer-close{border:0;background:transparent;font-size:28px;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;text-align:left;border:0;background:transparent;border-bottom:1px solid var(--line);font-size:15px}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:5px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:13px}
    .footer{margin-top:70px;background:#101d35;color:#bfc9da;padding:48px 0 20px;font-size:13px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-brand strong{font-size:21px;color:#fff}
    .footer-brand p{margin:12px 0}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#bfc9da}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:15px;border-top:1px solid #ffffff1c;margin-top:35px;padding-top:18px;color:#91a0b7}
    .tool-detail-page{padding:44px 0 20px}
    .breadcrumb{font-size:13px;color:var(--muted);margin-bottom:25px}
    .breadcrumb a{color:var(--theme)}
    .tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:30px;align-items:start}
    .tool-main,.tool-side{background:#fff;border:1px solid var(--line);border-radius:16px}
    .tool-main{padding:34px}
    .tool-heading{display:flex;align-items:flex-start;gap:20px;padding-bottom:25px;border-bottom:1px solid var(--line)}
    .tool-icon{width:76px;height:76px;border-radius:17px;object-fit:cover;background:#eef3fb;flex:0 0 auto}
    .tool-heading h1{margin:0 0 8px;font-size:30px;line-height:1.3}
    .tool-heading p{margin:0;color:var(--muted);font-size:14px}
    .tool-meta{display:flex;flex-wrap:wrap;gap:14px;margin-top:16px;color:var(--muted);font-size:13px}
    .tool-meta span{padding-right:14px;border-right:1px solid var(--line)}
    .tool-meta span:last-child{border:0}
    .tool-content{min-width:0;max-width:100%;overflow-x:auto;padding-top:28px}
    .tool-content h2,.tool-content h3{color:var(--ink);margin-top:26px}
    .tool-content img,.tool-content video{max-width:100%;height:auto}
    .tool-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse}
    .tool-content p{margin:0 0 16px}
    .tool-actions{display:flex;gap:12px;margin-top:28px;padding-top:23px;border-top:1px solid var(--line)}
    .primary-btn,.secondary-btn{display:inline-block;padding:10px 18px;border-radius:8px;font-size:14px}
    .primary-btn{background:var(--theme);color:#fff}
    .secondary-btn{border:1px solid var(--theme);color:var(--theme)}
    .tool-side{padding:22px}
    .tool-side h2{margin:0 0 16px;font-size:18px}
    .related-tool{display:flex;gap:10px;padding:13px 0;border-bottom:1px solid var(--line)}
    .related-tool:last-child{border-bottom:0}
    .related-tool img{width:42px;height:42px;border-radius:9px;object-fit:cover;background:#eef3fb}
    .related-tool strong{display:block;font-size:14px}
    .related-tool small{display:block;color:var(--muted);font-size:12px;line-height:1.5}
    @media(max-width:980px){
      .main-nav{display:none}.hamburger{display:block}.header-inner{height:68px}.header-btns{margin-left:auto}
      .logo{min-width:auto}.mega-menu{width:600px}.tool-layout{grid-template-columns:1fr}.tool-side{order:2}
    }
    @media(max-width:640px){
      .container{width:min(100% - 26px,1180px)}.topbar .container{display:block;padding:7px 0}.topbar-links{gap:12px;margin-top:2px}
      .member-link{display:none}.open-account{padding:7px 10px}.mega-menu{display:none}
      .tool-detail-page{padding-top:28px}.tool-main{padding:22px 18px}.tool-heading{gap:13px}.tool-icon{width:58px;height:58px;border-radius:13px}.tool-heading h1{font-size:24px}
      .tool-meta{gap:8px}.tool-meta span{padding-right:8px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-brand{grid-column:1/-1}.footer-bottom{display:block}.footer-bottom span{display:block;margin:5px 0}
    }