.header-facebook {
  display: inline-grid;
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  font-family: Arial, sans-serif;
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}

.header-facebook:hover,
.header-facebook:focus-visible {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--ink);
}

@media (max-width: 900px) {
  .header-inner { gap: 12px; }
  .site-brand { margin-right: auto; }
  .header-facebook {
    width: 36px;
    height: 36px;
    flex-basis: 36px;
    font-size: 21px;
  }
}

@media (max-width: 430px) {
  .site-brand-copy { display: none; }
}