body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin: 0;
  padding: 2rem;
  background: #f4f6f8;
  color: #1f2933;
}

main {
  max-width: 32rem;
  margin: auto;
  background: #fff;
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

button {
  font-size: 1rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 0.4rem;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
}

pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 0.4rem;
  overflow-x: auto;
}