:root{
      --ink:#0a2342; --muted:#5b718f; --brand:#0e6fdc; --bg:#f7fbff; --card:#ffffff;
      --line:#e3edfb; --radius:16px; --shadow:0 10px 30px rgba(14,111,220,.09);
      --success:#1a9c5d; --danger:#c13d3d; --warning:#c97b16;
      --maxw: 1000px;
    }
    *{box-sizing:border-box}
    html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}
    a{color:var(--brand);text-decoration:none}
    a:hover{text-decoration:underline}
    img{max-width:100%;height:auto;display:block}
    .container{width:min(var(--maxw),92vw);margin:0 auto;padding:24px}
    header{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:50}
    .nav{display:flex;align-items:center;justify-content:space-between;padding:10px 0}
    .logo{font-weight:800;color:var(--brand);letter-spacing:.2px}
    .nav a{color:var(--ink);font-weight:600;margin-left:16px}
    .progress{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--brand),#39b0ff);width:0;z-index:70}
    .hero{margin-top:18px;background:linear-gradient(180deg,#ffffff,#fdfefe);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
    .hero h1{font-size:clamp(26px,4.2vw,42px);margin:0}
    .lead{color:var(--muted);max-width:70ch;margin:10px 0 0}
    .meta{display:flex;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-top:8px}
    .toc{position:sticky;top:84px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;min-width:220px}
    .toc strong{display:block;margin-bottom:8px}
    .toc a{display:block;padding:6px 0;color:var(--muted)}
    .toc a.active{color:var(--brand);font-weight:700}
    main{display:grid;grid-template-columns:260px 1fr;gap:24px;margin-top:24px}
    article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
    article h2{color:var(--brand);margin-top:8px}
    .grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
    .highlight{background:#eef5ff;border-left:4px solid var(--brand);padding:12px 14px;border-radius:12px}
    table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
    th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}
    thead th{background:#f4f8ff}
    tr:last-child td{border-bottom:none}
    .pros, .cons{padding-left:18px}
    .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
    .btn{display:inline-block;padding:12px 18px;border-radius:12px;border:1px solid transparent;font-weight:700}
    .btn.primary{background:var(--brand);color:#fff}
    .btn.ghost{background:#eaf2fd;color:var(--brand)}
    footer{margin:28px 0 40px;color:var(--muted);text-align:center}
    @media (max-width: 900px){ main{grid-template-columns:1fr} .toc{order:2} }