:root{
      --theme:#0B3D91;
      --ink:#152238;
      --muted:#68758a;
      --line:#e5eaf1;
      --paper:#f5f7fb;
      --white:#fff;
      --accent:#d99a2b;
      --shadow:0 16px 40px rgba(17,35,66,.09);
      --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:#0c1729;color:#cbd5e1;font-size:13px}
    .topbar .container{min-height:36px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{color:#fff}
    .topbar-links{display:flex;gap:24px}

    .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;white-space:nowrap;color:var(--theme);font-size:20px;font-weight:800}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:block;padding:25px 14px;font-size:15px;font-weight:600;color:#344156}
    .nav-link:hover,.nav-link:focus{color:var(--theme)}
    .has-arrow:after{content:"";display:inline-block;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);width:270px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:.2s;z-index:30}
    .mega-menu{width:min(760px,90vw)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .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 a{display:block;padding:9px 10px;border-bottom:1px solid #f0f2f6;font-size:14px}
    .dropdown-panel a:last-child{border:0;color:var(--theme);font-weight:700}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{display:flex;gap:10px;min-height:76px;padding:11px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe;transition:.2s}
    .mega-card:hover{border-color:var(--theme);background:#f2f6ff}
    .mega-card img{width:32px;height:32px;object-fit:contain;flex:none}
    .mega-card span,.mega-card strong{display:block}
    .mega-card strong{font-size:13px;line-height:1.4}
    .mega-card small{display:block;color:var(--muted);font-size:11px;line-height:1.5;margin-top:3px}
    .mega-footer{display:block;margin-top:13px;padding-top:12px;border-top:1px solid var(--line);color:var(--theme);font-size:13px;font-weight:700}
    .header-btns{display:flex;align-items:center;gap:10px}
    .member-link{font-size:14px;color:var(--theme);font-weight:700}
    .open-account{padding:9px 15px;background:var(--theme);color:#fff;border-radius:8px;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer}
    .hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--ink);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{position:fixed;inset:0;background:rgba(7,18,35,.55);opacity:0;visibility:hidden;transition:.25s;z-index:40}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:0;width:min(380px,88vw);height:100vh;background:#fff;transform:translateX(100%);transition:.3s;z-index:41;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:16px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:700}
    .drawer-head>a{margin-left:auto;padding:7px 12px;background:var(--theme);color:#fff;border-radius:6px;font-size:13px}
    .drawer-close{border:0;background:none;font-size:28px;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 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(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 12px;background:#f7f9fc}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:9px 4px;border-bottom:1px solid #e9edf3;color:var(--muted);font-size:14px}

    .tool-detail-page{padding:54px 0 80px}
    .crumbs{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:22px}
    .crumbs a{color:var(--theme)}
    .tool-detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:28px;align-items:start}
    .tool-article,.related-tools{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(17,35,66,.04)}
    .tool-article{padding:36px}
    .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;object-fit:contain;padding:12px;border:1px solid #dce5f4;border-radius:16px;background:#f5f8ff;flex:none}
    .eyebrow{margin:0 0 6px;color:var(--theme);font-size:13px;font-weight:700;letter-spacing:.08em}
    .tool-heading h1{margin:0;font-size:32px;line-height:1.3}
    .tool-intro{margin:8px 0 0;color:var(--muted)}
    .tool-meta{display:flex;flex-wrap:wrap;gap:18px;margin:20px 0 28px;color:var(--muted);font-size:13px}
    .tool-meta b{color:var(--ink);font-weight:600}
    .tool-body{min-width:0;max-width:100%;overflow-x:auto;font-size:16px}
    .tool-body img,.tool-body video{max-width:100%;height:auto}
    .tool-body table{max-width:100%;display:block;overflow-x:auto;border-collapse:collapse}
    .tool-body h2,.tool-body h3{color:var(--ink);margin-top:30px}
    .tool-body blockquote{margin:24px 0;padding:15px 20px;border-left:4px solid var(--accent);background:#fff8e9;color:#5e4b28}
    .tool-body code{padding:2px 6px;background:#eef3fa;color:var(--theme);border-radius:4px}
    .tool-actions{display:flex;gap:12px;margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}
    .btn{display:inline-flex;justify-content:center;align-items:center;padding:11px 20px;border-radius:8px;font-size:14px;font-weight:700}
    .btn-primary{background:var(--theme);color:#fff}
    .btn-light{background:#edf3ff;color:var(--theme)}
    .related-tools{padding:22px;position:sticky;top:20px}
    .related-tools h2{font-size:18px;margin:0 0 14px}
    .related-card{display:grid;grid-template-columns:42px 1fr;gap:11px;padding:14px 0;border-top:1px solid var(--line)}
    .related-card img{width:42px;height:42px;object-fit:contain;padding:6px;background:#f4f7fc;border-radius:8px}
    .related-card strong{display:block;font-size:14px;line-height:1.4}
    .related-card p{margin:4px 0 0;color:var(--muted);font-size:12px;line-height:1.5}

    .footer{background:#0c1729;color:#bdc8d8;padding:48px 0 20px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:35px}
    .footer strong{color:#fff;font-size:20px}
    .footer h3{margin:0 0 13px;color:#fff;font-size:15px}
    .footer p{margin:7px 0;font-size:13px}
    .footer-grid>div:not(.footer-brand) a{display:block;margin:7px 0;color:#bdc8d8;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#91a0b4}

    @media(max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .member-link{display:none}
      .tool-detail-layout{grid-template-columns:1fr}
      .related-tools{position:static}
    }
    @media(max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:7px 0}
      .topbar-links{gap:12px;flex-wrap:wrap}
      .header-inner{height:66px;gap:12px}
      .logo{font-size:17px}
      .logo img{width:32px;height:32px}
      .open-account{padding:8px 10px}
      .tool-detail-page{padding:32px 0 55px}
      .tool-article{padding:22px 18px}
      .tool-heading{gap:13px}
      .tool-icon{width:58px;height:58px;padding:8px}
      .tool-heading h1{font-size:24px}
      .tool-meta{gap:10px 14px}
      .tool-actions{flex-direction:column}
      .btn{width:100%}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{flex-direction:column;gap:5px}
    }