.top-nav {
  background: var(--surface);
  padding: 0.8rem 1.5rem;
  display: flex;
  gap: 1.5rem;
  border-bottom: 1px solid var(--text-secondary);
}
.top-nav a {
  color: var(--primary);
  text-decoration: none;
}
.top-nav a:hover {
  text-decoration: underline;
}
main {
  padding: 1.5rem;
}