body {
  font-family: Helvetica, sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 2rem;
}
#root {
  background: white;
  max-width: 800px;
  margin: auto;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
textarea {
  width: 100%;
  font-size: 1rem;
}
.buttons {
  margin-top: 1rem;
}
button {
  margin-right: 0.75rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
}
pre {
  background: #eee;
  padding: 1rem;
  border-radius: 6px;
  white-space: pre-wrap;
  margin-top: 1rem;
}
footer {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: #555;
}