:root{
      --theme:#0B3D91;
      --ink:#14213d;
      --muted:#68758b;
      --line:#e5eaf2;
      --paper:#f5f7fb;
      --white:#fff;
      --accent:#f0b429;
      --shadow:0 18px 45px rgba(17,38,74,.10);
      --radius:16px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);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:#071d46;color:#dce7fb;font-size:13px}
    .topbar .container{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar a{color:#dce7fb;margin-left:20px}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:20px;font-weight:800;color:var(--theme)}
    .logo img{width:38px;height:38px;object-fit:contain;border-radius:9px}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;list-style:none;padding:0;margin:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:76px;padding:0 14px;color:#263754;font-size:15px;font-weight:600}
    .nav-link:hover,.nav-item:focus-within>.nav-link{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%) translateY(8px);visibility:hidden;opacity:0;transition:.2s ease;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:0 0 14px 14px;padding:18px;z-index:30}
    .dropdown-panel{width:260px}
    .dropdown-panel>a:not(.mega-footer){display:block;padding:9px 10px;border-bottom:1px solid #eef1f6;color:#42516b;font-size:14px}
    .dropdown-panel>a:hover,.mega-card:hover{color:var(--theme);background:#f5f8ff}
    .nav-item:hover>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.dropdown-panel,.nav-item:focus-within>.mega-menu{visibility:visible;opacity:1;transform:translateX(-50%) translateY(0)}
    .mega-menu{width:min(760px,calc(100vw - 40px))}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:block;min-height:92px;padding:10px;border:1px solid #edf0f5;border-radius:10px;transition:.2s;color:#273753}
    .mega-card img{width:34px;height:34px;object-fit:contain;margin-bottom:5px;border-radius:7px}
    .mega-card strong{display:block;font-size:13px;line-height:1.45}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5;margin-top:3px}
    .mega-footer{display:block;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:13px;white-space:nowrap}
    .header-btns>a:first-child{color:var(--theme);font-weight:700;font-size:14px}
    .account-link{padding:8px 15px;border-radius:8px;color:#fff!important;background:var(--theme);font-size:13px!important}
    .hamburger{display:none;width:40px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--theme);margin:4px 0;transition:.2s}

    .drawer-overlay{display:none;position:fixed;inset:0;background:rgba(4,18,45,.52);z-index:60}
    .drawer-overlay.open{display:block}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(390px,88vw);height:100vh;background:#fff;z-index:70;transform:translateX(100%);transition:.25s ease;overflow:auto;box-shadow:-14px 0 35px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;color:#fff;background:var(--theme);padding:5px 11px;border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:transparent;font-size:29px;line-height:1;color:#64728a;cursor:pointer}
    .drawer-menu{padding:10px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;color:#253550;font-weight:600;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
    .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:14px}

    .tools-page{padding:64px 0 85px}
    .tools-heading{text-align:center;max-width:730px;margin:0 auto 42px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--theme);font-weight:800;font-size:13px;letter-spacing:.12em}
    .eyebrow:before{content:"";width:26px;height:2px;background:var(--accent)}
    .tools-heading h1{margin:14px 0 12px;font-size:clamp(30px,4vw,48px);line-height:1.2;color:#102a59}
    .tools-heading p{margin:0;color:var(--muted);font-size:16px}
    .tools-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px;padding:16px 20px;background:#fff;border:1px solid var(--line);border-radius:14px}
    .tools-toolbar strong{font-size:18px;color:#172f5d}
    .tools-toolbar span{color:var(--muted);font-size:14px}
    .tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .tool-card{display:flex;flex-direction:column;min-height:260px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 7px 22px rgba(32,58,102,.045);transition:.22s ease}
    .tool-card:hover{transform:translateY(-5px);border-color:#bfd0ee;box-shadow:var(--shadow)}
    .tool-icon{display:flex;align-items:center;justify-content:center;width:58px;height:58px;margin-bottom:17px;border-radius:14px;background:#edf3ff;color:var(--theme);font-size:0}
    .tool-icon img{width:38px;height:38px;object-fit:contain}
    .tool-card h2{margin:0 0 9px;color:#17376f;font-size:20px;line-height:1.35}
    .tool-card p{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;margin:0;color:var(--muted);font-size:14px;line-height:1.75}
    .tool-card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:20px}
    .tool-card-footer time{color:#8a95a8;font-size:12px}
    .tool-link{color:var(--theme);font-size:14px;font-weight:700}
    .tool-link:after{content:" →";transition:.2s}
    .tool-card:hover .tool-link:after{padding-left:4px}
    .tools-empty{grid-column:1/-1;padding:55px;text-align:center;background:#fff;border:1px dashed #c8d3e7;border-radius:14px;color:var(--muted)}
    .tools-note{margin-top:28px;padding:18px 22px;border-left:4px solid var(--accent);background:#fff9e9;color:#6e5920;border-radius:0 10px 10px 0;font-size:14px}

    .footer{padding:54px 0 0;background:#0a1c3e;color:#c5d2e8}
    .footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:35px;padding-bottom:40px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:16px}
    .footer p{margin:0 0 10px;font-size:13px;line-height:1.9}
    .footer-grid a{display:block;margin:7px 0;color:#c5d2e8;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{padding:19px 0;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:#93a5c2}

    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .tools-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{height:auto;min-height:38px;padding:7px 0;align-items:flex-start;gap:5px;flex-direction:column}
      .topbar .contact a{margin-left:0;margin-right:14px}
      .header-inner{min-height:66px;gap:12px}
      .logo{font-size:17px}
      .logo img{width:32px;height:32px}
      .header-btns{margin-left:auto;gap:7px}
      .header-btns>a:first-child{display:none}
      .account-link{padding:7px 10px;font-size:12px!important}
      .tools-page{padding:42px 0 58px}
      .tools-heading{margin-bottom:28px}
      .tools-heading h1{font-size:32px}
      .tools-heading p{font-size:14px}
      .tools-toolbar{display:block;padding:14px 16px}
      .tools-toolbar span{display:block;margin-top:4px}
      .tools-grid{grid-template-columns:1fr;gap:14px}
      .tool-card{min-height:235px;padding:20px}
      .footer-grid{grid-template-columns:1fr;gap:23px;padding-bottom:28px}
      .mega-grid{grid-template-columns:1fr 1fr}
    }