#site-header {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
  background-color: var(--black);
  color: var(--white);
}

/* Brand and nav on one line; wraps only if there's no room. */
.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 2rem;
}