:root{font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:#1f2937;background:#f8fafc}body{margin:0}main{max-width:720px;margin:12vh auto;padding:2rem;line-height:1.65;background:white;border:1px solid #e5e7eb;border-radius:14px;box-shadow:0 8px 30px #0f172a0d}h1{margin-top:0;color:#0f4c5c}a{margin-right:1.2rem;color:#0f4c5c}code{background:#eef2ff;padding:.15rem .35rem;border-radius:4px}