body{font-family:Arial,Helvetica,sans-serif;background:#f4f6f9;margin:0}
.container{max-width:900px;margin:40px auto;background:#ffffff;padding:25px;border-radius:8px}
h1{margin-top:0}
textarea{width:100%;height:160px;margin:15px 0;padding:10px;font-family:monospace}
button{background:#e53935;color:white;border:none;padding:10px 16px;cursor:pointer}
button:hover{opacity:0.9}
pre{background:#f0f0f0;padding:12px;white-space:pre-wrap}