header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2.5rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

#logo a {
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  font-weight: bold;
  letter-spacing: 1px;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

header nav a {
  text-decoration: none;
  color: var(--color-text-subtle);
  font-weight: 500;
  transition: color 0.3s ease;
}

header nav a:hover {
  color: var(--color-text-primary);
}

footer {
  text-align: center;
  padding: 1.5rem;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-footer);
  font-size: 0.9rem;
}