body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: #222;
  background: #fff;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px;
}

h1 {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: 1rem;
}

h2 {
  margin-top: 2rem;
  font-size: 1.35rem;
}

h3 {
  margin-top: 1.5rem;
  font-size: 1.05rem;
}

a {
  color: #06c;
}

nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid #eee;
  font-size: 0.9rem;
  color: #666;
}

.notice {
  background: #f7f7f7;
  padding: 16px;
  border-radius: 8px;
}