:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1f2937;background:#f5f7fb}body{margin:0}main{max-width:960px;margin:0 auto;padding:2rem}h1{margin-top:0}pre{background:#fff;border:1px solid #e5e7eb;border-radius:8px;padding:1rem;overflow-x:auto}