/* ============================================================================
 * Xynapse i18n 样式 · v1
 * 2026-08-24
 * ========================================================================== */

/* ---------- 语言切换按钮（对称主题切换按钮）---------- */
.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 0;
  white-space: nowrap;
  min-width: 56px;
  justify-content: center;
}
.lang-toggle:hover,
.lang-toggle:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
  outline: none;
}
.lang-toggle .lang-toggle-label {
  font-variant-caps: all-small-caps;
}
html[data-theme="light"] .lang-toggle:hover,
html[data-theme="light"] .lang-toggle:focus-visible {
  box-shadow: 0 0 12px rgba(8, 145, 178, 0.25);
}

/* ---------- FOUC 防护：英文模式下未翻译完成前隐藏 ---------- */
html[data-i18n-loading] body {
  opacity: 0;
  transition: opacity 0.15s ease;
}
html[data-lang="zh-CN"] body {
  opacity: 1;
}
/* i18n.js 加载并应用完翻译后，会移除 data-i18n-loading，
   CSS 上面的 :not 选择器会让 body 恢复显示 */

/* ---------- 主题按钮 + 语言按钮并排时的小屏适配 ---------- */
@media (max-width: 768px) {
  .lang-toggle {
    font-size: 0.7rem;
    padding: 4px 8px;
    min-width: 48px;
  }
}

/* ---------- 可访问性：减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .lang-toggle { transition: none; }
}