.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 2px;
  border: 1px solid currentColor;
  border-radius: 999px;
  opacity: .85;
}
.lang-switch-btn {
  appearance: none;
  background: transparent;
  border: 0;
  border-radius: 999px;
  padding: 2px 8px;
  font: inherit;
  font-size: .78em;
  letter-spacing: .04em;
  color: inherit;
  cursor: pointer;
  opacity: .6;
}
.lang-switch-btn:hover { opacity: 1; }
.lang-switch-btn.is-active {
  opacity: 1;
  font-weight: 700;
  background: currentColor;
}

.lang-switch-btn.is-active {
  color: inherit;
  background: color-mix(in srgb, currentColor 18%, transparent);
}