:root{color-scheme:light;font-family:Segoe UI,Helvetica Neue,sans-serif}*{box-sizing:border-box}body{margin:0;background:#f5f7fb;color:#111827}main{max-width:960px;margin:0 auto;padding:32px 20px}.panel{background:#ffffff;border:1px solid #d7deeb;border-radius:12px;padding:16px;margin-bottom:16px}.muted{color:#4b5563}pre{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:14px;overflow-x:auto}