* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #111827;
  background: #f9fafb;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 28px;
  color: #111827;
}

nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 40px;
}

nav a {
  color: #2563eb;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  padding: 8px 16px;
  border: 1px solid #2563eb;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}

nav a:hover {
  background: #2563eb;
  color: #fff;
}

.content h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.content .last-updated {
  color: #6b7280;
  margin-bottom: 24px;
}

.content h3 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 8px;
}

.content h4 {
  font-size: 16px;
  margin-top: 24px;
  margin-bottom: 8px;
  color: #1f2937;
}

.content p {
  color: #374151;
  margin-bottom: 12px;
}

.content .notice {
  background: #fef3c7;
  border-left: 4px solid #f59e0b;
  padding: 16px;
  margin: 20px 0;
  font-size: 14px;
  color: #92400e;
}

.content .indent {
  margin-left: 24px;
}

footer {
  text-align: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid #e5e7eb;
  color: #6b7280;
  font-size: 14px;
}

footer a {
  color: #2563eb;
  text-decoration: none;
}

footer p {
  margin-bottom: 4px;
}

a.back-link {
  display: inline-block;
  margin-bottom: 24px;
  color: #2563eb;
  text-decoration: none;
  font-size: 14px;
}

a.back-link:hover {
  text-decoration: underline;
}