.opt-tabs {
  margin: 12px 0 16px;
  text-align: center;
}

.opt-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.opt-tabs__button {
  margin: 0;
  opacity: 0.75;
  transition: opacity 0.2s ease;
}

.opt-tabs__button:hover {
  opacity: 0.9;
}

.opt-tabs__button.is-active {
  opacity: 1;
}

.opt-auth-tab,
.opt-registration-tab {
  overflow: hidden;
  opacity: 1;
  max-height: 1000px;
  transform: translateY(0);
  transition: max-height 0.35s ease, opacity 0.25s ease, transform 0.25s ease;
}

.opt-tab-hidden {
  opacity: 0;
  max-height: 0;
  transform: translateY(-6px);
  pointer-events: none;
}