body{font-family:-apple-system,Segoe UI,Roboto,sans-serif;margin:0;color:#1f2937;background:#f8fafc}
header{background:#0f172a;color:#fff;padding:18px 32px;display:flex;justify-content:space-between;align-items:center}
header a{color:#cbd5e1;margin-left:20px;text-decoration:none}
main{max-width:860px;margin:40px auto;padding:0 24px;line-height:1.6}
code,pre{background:#e2e8f0;border-radius:4px;padding:2px 6px}
pre{padding:14px;overflow:auto}
footer{text-align:center;color:#64748b;font-size:13px;padding:40px}
.ok{color:#16a34a;font-weight:600}