body{font-family:system-ui,sans-serif;margin:0;background:#fff;color:#111}
.banner{background:#b00020;color:#fff;font-weight:700;text-align:center;padding:12px 8px;position:sticky;top:0}
main{max-width:42rem;margin:0 auto;padding:16px}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px}
pre{white-space:pre-wrap;word-break:break-all;background:#f4f4f4;padding:10px;border-radius:6px;min-height:3em}
button{font-size:18px;padding:12px 20px}
.small{color:#555;font-size:13px}
@media (prefers-color-scheme:dark){body{background:#111;color:#eee}pre{background:#222}a{color:#8ab4f8}}