* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f4f8;
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.site-header {
  background-color: #1a1a2e;
  color: #fff;
  text-align: center;
  padding: 2.5rem 1rem;
}
.site-header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.4rem;
}
.site-header .subtitle {
  font-size: 1rem;
  color: #a0aec0;
}
.container {
  max-width: 700px;
  margin: 2rem auto;
  padding: 0 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.section-links {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.section-links h2 {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #555;
  margin-bottom: 1rem;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 0.5rem;
}
.link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.link-list .link-item {
  border-radius: 8px;
  transition: background 0.2s;
}
.link-list .link-item:hover {
  background-color: #f7fafc;
}
.link-item .link-anchor {
  display: block;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: #2d3748;
  font-size: 0.95rem;
  border-left: 3px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
.link-item:hover .link-anchor {
  color: #4a6cf7;
  border-left-color: #4a6cf7;
}
.link-item.external .link-anchor {
  color: #555;
}
.link-item.external:hover .link-anchor {
  color: #38a169;
  border-left-color: #38a169;
}
.site-footer {
  text-align: center;
  padding: 1.2rem;
  background-color: #1a1a2e;
  color: #a0aec0;
  font-size: 0.85rem;
}