/* Simple responsive layout */
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
  color: #333;
}
header, footer {
  background: #f0f0f0;
  padding: 1rem;
  text-align: center;
}
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}
@media (max-width: 600px) {
  body { font-size: 0.9rem; }
}