body {
  font-family: 'Noto Sans TC', Arial, sans-serif;
  background-color: #f9f9f9;
  color: #222;
  margin: 0;
  padding: 0;
  line-height: 1.7;
  font-size: 1rem;
}
header {
  background-color: #004466;
  color: white;
  padding: 1rem;
}
header h1 {
  margin: 0;
  font-size: 1.5rem;
}
nav[aria-label="主選單"] ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
nav[aria-label="主選單"] a {
  color: #fff;
  text-decoration: underline;
}
main {
  padding: 1rem;
}
.responsive {
  width: 100%;
  max-width: 800px;
  height: auto;
  display: block;
  margin: 1rem auto;
}
footer {
  background-color: #eee;
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
}
footer a {
  color: #004466;
  text-decoration: underline;
}
footer .info p,
footer .social {
  margin: 0.25rem 0;
}
@media (max-width: 600px) {
  nav[aria-label="主選單"] ul {
    flex-direction: column;
    gap: 0.5rem;
  }
}