/* 语言切换器 —— 首页 .head-tools 与工具页 .topbar-actions 共用
   形态与主题按钮一致：36×36 圆角图标按钮 + 下拉菜单 */
.lang-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  margin-left: 6px;
  vertical-align: middle;
  line-height: 1;
}

/* 工具页的 .topbar-actions 是块级容器，让切换器和收藏按钮并排 */
.topbar-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

.lang-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  padding: 0;
  margin: 0;
  border: 1px solid var(--border, var(--line, #e4e7ec));
  border-radius: 9px;
  background: var(--surface, #fff);
  color: var(--text, #101828);
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  font: inherit;
  line-height: 1;
}

.lang-btn:hover,
.lang-switch.open .lang-btn {
  border-color: var(--accent, #2563eb);
  color: var(--accent, #2563eb);
}

.lang-btn:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 2px;
}

.lang-btn svg {
  width: 17px;
  height: 17px;
  display: block;
  pointer-events: none;
}

/* ---------- 下拉菜单 ---------- */
.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 90;
  min-width: 178px;
  padding: 5px;
  background: var(--surface, #fff);
  border: 1px solid var(--border, var(--line, #e4e7ec));
  border-radius: 11px;
  box-shadow: 0 12px 32px -12px rgba(16, 24, 40, .28), 0 2px 8px -2px rgba(16, 24, 40, .12);
}

.lang-menu[hidden] { display: none; }

.lang-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 8px 10px;
  margin: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text, #101828);
  font: inherit;
  font-size: 13.5px;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.lang-item:hover { background: var(--surface-2, rgba(16, 24, 40, .05)); }
.lang-item:focus-visible { outline: 2px solid var(--accent, #2563eb); outline-offset: -2px; }

.lang-item .lang-code {
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--muted, var(--text-dim, #667085));
}

.lang-item.is-current { color: var(--accent, #2563eb); font-weight: 600; }
.lang-item.is-current .lang-code { color: var(--accent, #2563eb); }
.lang-item.is-current .lang-name::after {
  content: "✓";
  margin-left: 6px;
  font-size: 11px;
}

@media (max-width: 640px) {
  .lang-btn { width: 34px; height: 34px; }
  .lang-menu { min-width: 158px; }
  .lang-item { font-size: 13px; }
}

/* 语言切换后，正在翻译的文本短暂淡入，避免闪现原文 */
html[data-i18n-active] body { transition: opacity .12s ease; }

/* 深色主题下菜单阴影更深一点 */
html[data-theme="dark"] .lang-menu {
  box-shadow: 0 14px 34px -12px rgba(0, 0, 0, .7), 0 2px 8px -2px rgba(0, 0, 0, .5);
}

/* 外语比中文宽：文字不换行，空间不够时整块折到下一行 */
.head-inner { flex-wrap: wrap; height: auto; min-height: 62px; padding-top: 8px; padding-bottom: 8px; }
.head-nav { flex-wrap: wrap; gap: 4px; }
.head-tools { flex: 0 0 auto; }

.head-nav a,
.brand,
.brand small,
.topbar-actions .favorite-toggle,
.topbar-actions a,
.topbar-actions button {
  white-space: nowrap;
}

@media (max-width: 1400px) {
  .head-inner { gap: 12px; }
  .head-nav a { padding: 6px 9px; font-size: 13.5px; }
}