:root{color:#1a1a1a;background:#fff;font-family:system-ui,-apple-system,sans-serif}body{padding:env(safe-area-inset-top) 16px env(safe-area-inset-bottom);margin:0}.app{max-width:640px;margin:0 auto}button{color:#fff;background:#1f4e79;border:none;border-radius:8px;padding:12px 20px;font-size:1rem}