:root{font-family:system-ui,sans-serif;color:#222;background:#f4f1ea}body{max-width:40rem;margin:0 auto;padding:1rem}header{text-align:center}.card{background:#fff;border-radius:.75rem;padding:1rem;box-shadow:0 1px 3px #00000026}input,select,button{font:inherit;padding:.4rem .8rem;border-radius:.4rem;border:1px solid #ccc}button{cursor:pointer;background:#6c5ce7;color:#fff;border:none}button:disabled{opacity:.5;cursor:not-allowed}.error{color:#c0392b}