body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f9fafb;margin:0;padding:0}.App{max-width:600px;margin:5% auto;background:#fff;border-radius:12px;box-shadow:0 4px 20px #0000001a;padding:30px 40px;text-align:center}h1{font-size:24px;color:#333;margin-bottom:24px}button{background-color:#007bff;border:none;color:#fff;padding:12px 20px;margin:10px 10px 0 0;font-size:14px;border-radius:6px;cursor:pointer;transition:background-color .2s ease}button:disabled{background-color:#7ab8ff;cursor:not-allowed}button:hover:not(:disabled){background-color:#0056b3}textarea{margin-top:10px;width:100%;height:120px;padding:10px;font-size:14px;font-family:monospace;border:1px solid #ccc;border-radius:6px;background-color:#f8f8f8;resize:vertical}strong{font-weight:600}p{color:#444;font-size:14px;margin:12px 0}p.error{color:#d9534f;background-color:#ffecec;padding:10px;border-radius:5px;font-weight:500}