body{font-family:Arial;background:#0f172a;color:#fff}.container{max-width:720px;margin:40px auto;padding:20px;background:#1e293b}textarea,input{width:100%;margin-top:10px;padding:10px}textarea{height:140px}button{margin-top:10px;width:100%;padding:10px;background:#f43f5e}.result{margin-top:20px;white-space:pre-wrap}