.site-header {
  border-bottom: 1px solid var(--colour-border);
  background-color: var(--colour-bg-surface);
}

.site-header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.site-logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--colour-primary);
  letter-spacing: -0.02em;
}

.site-logo:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  color: var(--colour-text-main);
  font-size: 0.9375rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--colour-secondary);
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--colour-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-xl);
  text-align: center;
}

.site-footer p {
  color: var(--colour-text-muted);
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .site-header nav {
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav-links {
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
  }
}