:root{--theme:#0B3D91;--ink:#10233f;--muted:#64748b;--line:#dbe5ef;--bg:#f4f7fb;--white:#fff;--accent:#e8a92e;--radius:14px}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--bg);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.6}
    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:#09182d;color:#c7d5e6;font-size:13px}
    .topbar .container{min-height:36px;display:flex;justify-content:space-between;align-items:center;gap:20px}
    .topbar strong{color:#fff}
    .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);box-shadow:0 3px 15px rgba(16,35,63,.05)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:36px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-weight:800;font-size:20px;color:var(--theme)}
    .logo img{width:36px;height:36px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;align-items:stretch;justify-content:center;gap:5px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;padding:26px 14px;color:#243752;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:13px;color:#8b9bb0}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:290px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 12px 12px;box-shadow:0 18px 35px rgba(11,61,145,.14);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:570px}
    .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}
    .nav-item>.dropdown-panel:before,.nav-item>.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .mega-title{margin:0 0 12px;color:var(--theme);font-size:13px;font-weight:800}
    .dropdown-panel>a{display:block;padding:8px 0;border-bottom:1px solid #edf1f5;font-size:14px}
    .mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mega-card{display:flex;gap:9px;padding:9px;border:1px solid #e6edf4;border-radius:9px;background:#fbfdff;min-width:0}
    .mega-card:hover{border-color:#9bb4d5;background:#f2f7fc}
    .mega-card img{width:34px;height:34px;object-fit:contain;flex:none}
    .mega-card span{min-width:0}
    .mega-card b,.mega-card small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card b{font-size:13px}.mega-card small{font-size:11px;color:var(--muted)}
    .mega-footer{display:block;margin-top:13px;padding-top:12px;border-top:1px solid var(--line);font-size:13px;color:var(--theme);font-weight:700}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .member-link{font-size:14px;color:var(--theme)}
    .account-btn{padding:9px 15px;border-radius:7px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:none;padding:6px;cursor:pointer}
    .hamburger span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;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{display:none;position:fixed;inset:0;background:rgba(5,19,38,.48);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-350px;width:min(350px,88vw);height:100vh;background:#fff;z-index:50;transition:right .25s;overflow:auto}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);font-weight:700;color:var(--theme)}
    .drawer-head>a{margin-left:auto;padding:6px 12px;background:var(--theme);color:#fff;border-radius:5px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;color:#74859b;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;text-align:left;border:0;border-bottom:1px solid #edf1f5;background:none;color:var(--ink);font-weight:600;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 7px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .tools-page{padding:54px 0 80px}
    .tools-intro{text-align:center;max-width:720px;margin:0 auto 35px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:2px}
    .eyebrow:before{content:"";width:26px;height:2px;background:var(--accent)}
    .tools-intro h1{margin:12px 0 12px;font-size:clamp(32px,5vw,52px);line-height:1.15;color:#102b50}
    .tools-intro p{margin:0;color:var(--muted);font-size:16px}
    .tool-toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px;padding:18px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
    .tool-toolbar strong{font-size:18px}.tool-toolbar span{color:var(--muted);font-size:14px}
    .tool-filter{display:flex;gap:8px;flex-wrap:wrap}.tool-filter a{padding:6px 12px;border-radius:20px;background:#eef4fb;color:var(--theme);font-size:13px}
    .tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .tool-card{display:flex;flex-direction:column;min-height:245px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);transition:.2s;box-shadow:0 5px 16px rgba(17,45,78,.04)}
    .tool-card:hover{transform:translateY(-4px);border-color:#98afd0;box-shadow:0 14px 30px rgba(11,61,145,.12)}
    .tool-icon{width:52px;height:52px;margin-bottom:17px;padding:9px;border-radius:12px;background:#eef4fb;object-fit:contain}
    .tool-card h2{margin:0 0 8px;font-size:19px;color:#173b6b}
    .tool-card p{margin:0;color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
    .tool-card-foot{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:20px;color:var(--theme);font-size:13px;font-weight:700}
    .tool-card-foot small{color:#8a9aae;font-weight:400}
    .tool-note{margin-top:36px;padding:22px 25px;border-left:4px solid var(--accent);background:#fff9eb;border-radius:8px;color:#6b5524;font-size:14px}
    .footer{background:#0a1b31;color:#aebdd0;padding:48px 0 22px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}
    .footer h3,.footer h4{margin:0 0 15px;color:#fff}.footer h3{font-size:21px}.footer h4{font-size:15px}
    .footer p{margin:0 0 10px;font-size:13px}.footer a{display:block;margin:7px 0;color:#aebdd0;font-size:13px}.footer a:hover{color:#fff}
    .footer-brand>a{display:inline-block;margin-right:15px}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid #23364e;font-size:12px;color:#71859e}
    @media(max-width:900px){.header-inner{gap:15px}.main-nav{display:none}.header-btns{margin-left:auto}.hamburger{display:block}.tool-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:600px){.container{width:min(100% - 28px,1180px)}.topbar .container{display:block;padding:8px 0}.topbar-links{margin-top:3px;gap:13px}.member-link{display:none}.account-btn{padding:8px 11px}.tools-page{padding:38px 0 55px}.tools-intro h1{font-size:34px}.tool-toolbar{display:block}.tool-filter{margin-top:14px}.tool-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:25px 18px}.footer-bottom{display:block}.footer-bottom span{display:block;margin-top:5px}}