body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Arial,sans-serif;margin:0;padding:0;background:#f7f7f7;color:#222}.app{max-width:1100px;margin:0 auto;padding:0 20px 40px;display:flex;flex-direction:column;gap:10px}button:disabled{background-color:#ccc;cursor:not-allowed}