[data-lang][hidden] {
  display: none !important;
}

.site-language-toggle {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 2147483000;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.42);
  border-radius: 50%;
  color: #fff;
  background: rgba(12, 18, 25, 0.9);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font: 700 14px/1 system-ui, -apple-system, "Segoe UI", sans-serif;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.site-language-toggle:hover {
  transform: translateY(-2px);
  border-color: #fff;
  background: rgba(28, 38, 49, 0.96);
}

.site-language-toggle:focus-visible {
  outline: 3px solid #54d6ff;
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .site-language-toggle {
    right: max(12px, env(safe-area-inset-right));
    bottom: max(12px, env(safe-area-inset-bottom));
    width: 48px;
    height: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-language-toggle { transition: none; }
}