:root{font-family:Inter,system-ui,sans-serif;color:#0f172a;background:#f8fafc}body{margin:0}.standalone{max-width:720px;margin:0 auto;padding:1.5rem}.card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:1rem 1.25rem}.muted{color:#64748b}.error{color:#b91c1c}.list{padding-left:1.2rem}