:root{
      --theme:#0B3D91;
      --theme-deep:#071d43;
      --ink:#13233d;
      --muted:#66758d;
      --line:#dfe7f2;
      --soft:#f3f7fc;
      --white:#fff;
      --accent:#2f80ed;
      --shadow:0 18px 50px rgba(12,42,88,.12);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#f7faff;font-family:Arial,"Microsoft YaHei","PingFang SC",sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;height:auto}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#071d43;color:#cbd8ed;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:#e8f0ff}
    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #e8eef7}
    .header-inner{height:78px;display:flex;align-items:center;gap:28px}
    .logo{display:flex;align-items:center;gap:10px;min-width:180px;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:stretch;justify-content:center;gap:3px;padding:0;margin:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;height:78px;padding:0 15px;color:#243550;font-size:15px;font-weight:600;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .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:100%;left:50%;transform:translate(-50%,8px);visibility:hidden;opacity:0;transition:.2s ease;background:#fff;border:1px solid #e3eaf4;border-radius:14px;box-shadow:var(--shadow);z-index:30}
    .dropdown-panel{width:260px;padding:12px}
    .dropdown-panel a:not(.mega-footer){display:block;padding:10px 12px;border-radius:8px;font-size:14px}
    .dropdown-panel a:not(.mega-footer):hover{background:var(--soft);color:var(--theme)}
    .mega-menu{width:min(850px,calc(100vw - 30px));padding:22px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translate(-50%,0)}
    .mega-menu:before,.dropdown-panel:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .mega-grid{display:grid;grid-template-columns:190px 1fr;gap:24px}
    .mega-grid h4{margin:0 0 8px;color:var(--theme);font-size:16px}
    .mega-grid p{margin:0 0 12px;color:var(--muted);font-size:13px}
    .mega-grid>div:first-child>a,.mega-grid>div:first-child>a:not(.mega-card){display:block;margin:8px 0;color:var(--theme);font-size:13px}
    .mega-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:flex;min-height:70px;flex-direction:column;gap:3px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfdff}
    .mega-card:hover{border-color:#98b6e4;background:#f1f6fd}
    .mega-card img{width:24px;height:24px;object-fit:contain}
    .mega-card b{font-size:13px;color:#1c355a}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5;overflow:hidden}
    .mega-footer{display:block;margin-top:18px;padding-top:13px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
    .member-btn{font-size:13px;color:var(--theme);font-weight:700}
    .open-btn{padding:8px 15px;color:#fff;background:var(--theme);border-radius:8px;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);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;background:rgba(4,16,38,.54);z-index:40}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,88vw);height:100vh;overflow:auto;background:#fff;z-index:50;transition:right .25s ease;box-shadow:-12px 0 35px rgba(0,0,0,.18)}
    .mobile-drawer.open{right:0}
    .drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;padding:6px 12px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;line-height:1;color:#53627a;cursor:pointer}
    .drawer-menu{padding:10px 20px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f7;background:none;text-align:left;color:var(--ink);font:inherit;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:4px 0 8px 15px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:70px;padding:52px 0 0;background:#071d43;color:#b7c6dd}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:36px}
    .footer strong{display:block;color:#fff;font-size:20px;margin-bottom:12px}
    .footer h4{margin:0 0 14px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid>div>a{display:block;margin:8px 0;color:#b7c6dd;font-size:13px}
    .footer-grid>div>a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding:18px 0;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#91a7c6}
    .tools-page{padding:68px 0 20px}
    .tools-heading{text-align:center;max-width:720px;margin:0 auto 38px}
    .tools-heading .eyebrow{display:inline-block;margin-bottom:9px;padding:5px 12px;border-radius:999px;background:#e5effd;color:var(--theme);font-size:12px;font-weight:700;letter-spacing:.08em}
    .tools-heading h1{margin:0 0 13px;color:var(--theme-deep);font-size:clamp(30px,4vw,48px);line-height:1.2}
    .tools-heading p{margin:0;color:var(--muted);font-size:16px}
    .tools-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;background:#fff}
    .tools-toolbar strong{font-size:15px;color:var(--ink)}
    .tools-toolbar span{font-size:13px;color:var(--muted)}
    .tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .tool-card{display:flex;flex-direction:column;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 8px 25px rgba(19,49,91,.05);transition:transform .2s,box-shadow .2s,border-color .2s}
    .tool-card:hover{transform:translateY(-5px);border-color:#9db9e3;box-shadow:var(--shadow)}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:56px;height:56px;margin-bottom:17px;border-radius:15px;background:#eaf2ff}
    .tool-icon img{width:34px;height:34px;object-fit:contain}
    .tool-card h2{margin:0 0 8px;color:var(--theme-deep);font-size:19px}
    .tool-card p{display:-webkit-box;overflow:hidden;margin:0 0 20px;color:var(--muted);font-size:14px;line-height:1.7;-webkit-box-orient:vertical;-webkit-line-clamp:3}
    .tool-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto;padding-top:15px;border-top:1px solid #edf1f6;color:#8a98ac;font-size:12px}
    .tool-link{color:var(--theme);font-weight:700}
    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .header-inner{justify-content:space-between}
      .mega-cards{grid-template-columns:repeat(2,1fr)}
      .tool-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:620px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{min-height:50px;align-items:flex-start;flex-direction:column;justify-content:center;gap:0}
      .topbar a{margin-left:12px}
      .header-inner{height:68px;gap:10px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:30px;height:30px}
      .member-btn{display:none}
      .tools-page{padding-top:42px}
      .tools-heading{margin-bottom:28px}
      .tools-heading h1{font-size:32px}
      .tools-heading p{font-size:14px}
      .tools-toolbar{align-items:flex-start;flex-direction:column}
      .tool-grid{grid-template-columns:1fr;gap:14px}
      .tool-card{padding:20px}
      .footer-grid{grid-template-columns:1fr;gap:25px}
      .footer-bottom{align-items:flex-start;flex-direction:column;gap:8px}
    }