:root{--bg:#0f1419;--card:#1a2332;--text:#e7ecf3;--muted:#8b9cb3;--accent:#3b82f6;--border:#2a3548}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}main{max-width:42rem;margin:0 auto;padding:2rem 1.25rem 3rem}h1{font-size:1.5rem;font-weight:600;margin:0 0 .5rem}p{color:var(--muted);margin:0 0 1rem}code{font-size:.875rem;padding:.15rem .4rem;border-radius:4px}code,section{background:var(--card);border:1px solid var(--border)}section{border-radius:12px;padding:1.25rem;margin-top:1.5rem}section h2{font-size:1rem;margin:0 0 .75rem}pre{margin:0;overflow-x:auto;font-size:.8rem;color:var(--muted)}