body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
}

main {
  max-width: 700px;
  margin: 40px auto;
  padding: 24px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

h1 {
  margin-top: 0;
}

section {
  margin-top: 24px;
}

footer {
  margin-top: 32px;
  font-size: 0.9rem;
  color: #555;
}