:root{
  --bg:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:#e5e7eb;
  --card:#f9fafb;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text)}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;line-height:1.65}
.wrap{max-width:980px;margin:0 auto;padding:32px 18px 56px}
.header{padding-bottom:18px;border-bottom:1px solid var(--border);margin-bottom:18px}
.badge{display:inline-block;font-size:12px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:4px 10px;background:#fff}
h1{font-size:28px;margin:8px 0 6px}
.subtitle{margin:0;color:var(--muted);font-size:14px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px 16px;margin:18px 0}
.lead{margin:0}
.muted{color:var(--muted)}
.small{font-size:14px}
.toc{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin-top:12px}
.toc a{display:block;text-decoration:none;color:inherit;border:1px solid var(--border);border-radius:12px;padding:10px 12px;background:#fff}
.toc a:hover{background:#f3f4f6}
h2{font-size:18px;margin:26px 0 10px}
h3{font-size:16px;margin:14px 0 6px}
ul{margin:8px 0 8px 20px}
code{background:#f3f4f6;padding:2px 6px;border-radius:8px}
.note{border:1px solid var(--border);background:#fff;border-radius:12px;padding:12px 14px;margin:14px 0}
.footer{margin-top:28px;padding-top:18px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}