:root{--text:#111827;--muted:#6b7280;--bg:#ffffff;--accent:#0f766e;--accent-2:#14b8a6;--border:#e5e7eb;}
    html{scroll-behavior:smooth}
    body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,'Apple Color Emoji','Segoe UI Emoji';line-height:1.7;color:var(--text);background:var(--bg);margin:0}
    header,main,footer{max-width:1000px;margin:0 auto;padding:24px}
    h1,h2,h3{line-height:1.25}
    h1{font-size:2rem;margin:0 0 12px}
    h2{font-size:1.5rem;margin:28px 0 12px}
    h3{font-size:1.25rem;margin:20px 0 8px}
    p{margin:12px 0}
    .lead{font-size:1.0625rem;color:var(--muted)}
    nav.toc{border:1px solid var(--border);border-radius:12px;padding:16px;background:#fafafa}
    nav.toc a{color:var(--accent);text-decoration:none}
    nav.toc li{margin:6px 0}
    table{width:100%;border-collapse:collapse;margin:12px 0 20px}
    th,td{border:1px solid var(--border);padding:10px;vertical-align:top}
    th{background:#f8fafc;text-align:left}
    code,kbd{background:#f3f4f6;border-radius:6px;padding:0 4px}
    .check{color:var(--accent-2);font-weight:700}
    .note{font-size:.95rem;color:var(--muted)}
    footer{border-top:1px solid var(--border);color:var(--muted);font-size:.95rem}