body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  padding: 40px;
  background: #f7f7f7;
  color: #222;
}

header {
  margin-bottom: 30px;
}

h1 {
  font-size: 2rem;
}

footer {
  margin-top: 40px;
  font-size: 0.9rem;
  color: #666;
}