body{background:#101827;color:#fff;font-family:Arial;padding:20px}.app{max-width:850px;margin:auto}.card{background:#202b40;padding:20px;border-radius:16px;margin:20px 0}textarea,input{width:100%;padding:15px;border-radius:10px;font-size:18px;box-sizing:border-box}button{padding:12px 25px;margin-top:12px;border-radius:10px}pre{white-space:pre-wrap}