/* レイアウト共通 */
header {
  background-color: #ffb6c1;
  color: white;
  padding: 1rem;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
}

main {
  padding: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #777;
  margin: 2rem 0;
}