/* 言語切替フローティングピル - plateau-3d-app（青紫グロー） */
.lang-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: inline-flex;
  border-radius: 999px;
  padding: 4px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(139, 92, 246, 0.3);
  box-shadow: 0 0 24px rgba(59, 130, 246, 0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.lang-toggle__btn {
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(229, 231, 235, 0.6);
  transition: all 200ms ease;
}

.lang-toggle__btn:hover:not([aria-pressed="true"]) {
  color: #e5e7eb;
}

.lang-toggle__btn[aria-pressed="true"] {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #fff;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.5);
}

.lang-toggle__btn:focus-visible {
  outline: 2px solid #8b5cf6;
  outline-offset: 2px;
}

@media (max-width: 768px) {
  .lang-toggle {
    top: 12px;
    right: 12px;
  }
  .lang-toggle__btn {
    padding: 4px 10px;
    font-size: 12px;
  }
}