body{margin:0;font-family:system-ui,sans-serif;background:#111;color:#eee}main{max-width:1100px;margin:0 auto;padding:32px}button{margin-right:8px;padding:8px 12px}section{margin-top:16px;padding:16px;border:1px solid #333;background:#1b1b1b}pre{white-space:pre-wrap;overflow-x:auto}.error{background:#3a1010}