:root{color-scheme:dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0;background:#0f172a;color:#e2e8f0}.container{max-width:640px;margin:0 auto;padding:4rem 1.5rem}h1{color:#0ea5e9;margin-bottom:.25rem}.muted{color:#64748b}.ok{color:#4ade80}.bad{color:#f87171}