:root {
  --aq-lang-bg: rgba(6, 11, 36, 0.55);
  --aq-lang-border: rgba(110, 150, 255, 0.22);
  --aq-lang-shadow: 0 18px 42px rgba(0, 0, 0, 0.45);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 2px;
  border-radius: 999px;
  background: var(--aq-lang-bg);
  border: 1px solid var(--aq-lang-border);
  box-shadow: var(--aq-lang-shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.lang-switch-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted, rgba(245, 247, 255, 0.72));
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 7px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
  user-select: none;
}

.lang-switch-btn:hover {
  color: var(--text-main, #f5f7ff);
}

.lang-switch-btn:focus-visible {
  outline: 2px solid rgba(70, 240, 255, 0.65);
  outline-offset: 2px;
}

.lang-switch-btn.is-active,
.lang-switch-btn[aria-pressed="true"] {
  color: #061028;
  background: linear-gradient(135deg, var(--accent, #46f0ff), var(--accent-2, #7bffcf));
  box-shadow: 0 10px 26px rgba(70, 240, 255, 0.28);
  transform: translateY(-0.5px);
}

@media (prefers-reduced-motion: reduce) {
  .lang-switch-btn {
    transition: none;
  }
}