.lang-btn {
  background: none;
  border: none;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  color: #2c3e50;
  border-radius: 4px;
  transition: background 0.2s;
}
.lang-btn.active {
  background: #2c3e50;
  color: #fff;
}