/* ==============================================
   TadNav v1.8.7
   修正：
   1. 桌機版子選單互斥（同層只開一個）
   2. 手機版強制單欄手風琴，多層縮排色彩區隔
   3. WCAG 1.4.10 流動排版修正
============================================== */

:root {
  --tadnav-font-family: inherit;
  --tadnav-inner-max-width: 100%;
  --tadnav-nav-min-height: 52px;
  --tadnav-nav-bg: transparent;
  --tadnav-nav-shadow: none;
  --tadnav-brand-color: #ffffff;

  --tadnav-focus-color: #ffdd00;
  --tadnav-focus-shadow-color: #000000;
  --tadnav-focus-width: 3px;

  --tadnav-item-color: #ffffff;
  --tadnav-item-bg: transparent;
  --tadnav-item-font-size: 1rem;
  --tadnav-item-padding-x: 1rem;
  --tadnav-item-padding-y: 0px;
  --tadnav-item-hover-bg: rgba(255, 255, 255, 0.14);
  --tadnav-item-hover-color: #ffffff;
  --tadnav-item-accent: rgba(255, 255, 255, 0.75);

  --tadnav-sub-bg: #ffffff;
  --tadnav-sub-shadow: 0 6px 24px rgba(0, 0, 0, 0.13);
  --tadnav-sub-border: #2e86c1;
  --tadnav-sub-divider: #f0f4f8;
  --tadnav-sub-divider-width: 1px;
  --tadnav-sub-min-width: 220px;

  --tadnav-sub-item-color: #1a3a5c;
  --tadnav-sub-item-bg: transparent;
  --tadnav-sub-item-font-size: 0.88rem;
  --tadnav-sub-item-padding-x: 1.1rem;
  --tadnav-sub-item-padding-y: 0.6rem;
  --tadnav-sub-item-hover-bg: #eaf4fd;
  --tadnav-sub-item-hover-color: #1a5276;

  --tadnav-scroll-btn-bg: #f0f4f8;
  --tadnav-scroll-btn-hover-bg: #dbeaf7;
  --tadnav-scroll-btn-color: #1a5276;
  --tadnav-scroll-btn-height: 28px;

  --tadnav-toggle-color: #ffffff;
  --tadnav-toggle-hover-bg: rgba(255, 255, 255, 0.15);

  /* 手機版各層背景色（深色主題預設） */
  --tadnav-mobile-bg: rgba(0, 0, 0, 0.55);
  --tadnav-mobile-sub-l1-bg: rgba(0, 0, 0, 0.18);
  --tadnav-mobile-sub-l2-bg: rgba(0, 0, 0, 0.28);
  --tadnav-mobile-sub-l3-bg: rgba(0, 0, 0, 0.36);
  --tadnav-mobile-sub-border: rgba(255, 255, 255, 0.30);
  --tadnav-mobile-sub-color: rgba(255, 255, 255, 0.92);
  --tadnav-mobile-item-border: rgba(255, 255, 255, 0.10);

  /* 手機版各層縮排邊線色（深色主題預設） */
  --tadnav-mobile-sub-l1-border: rgba(255, 255, 255, 0.25);
  --tadnav-mobile-sub-l2-border: rgba(255, 255, 255, 0.18);
  --tadnav-mobile-sub-l3-border: rgba(255, 255, 255, 0.12);

  /* 手機版 focus-visible 樣式（深色主題預設） */
  --tadnav-mobile-focus-bg: rgba(255, 255, 255, 0.15);
  --tadnav-mobile-focus-color: #ffffff;

  --tadnav-accordion-max-height: 9999px;
}

/* ── Reset ─────────────────────────────────── */
.tadnav-wrapper *,
.tadnav-wrapper *::before,
.tadnav-wrapper *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.tadnav-wrapper {
  background: var(--tadnav-nav-bg);
  box-shadow: var(--tadnav-nav-shadow);
  position: relative;
  z-index: 99999;
  font-family: var(--tadnav-font-family);
}

/* ── 全局鍵盤焦點強化 ───────────────────────── */
/* 平時完全隱藏（視覺上不可見，但螢幕閱讀器仍可讀取）；
   鍵盤 Tab 聚焦時滑入畫面並顯示明顯焦點外框。           */
.tadnav-skip {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100000;
  padding: 0.5rem 1.25rem;
  background: #000000;
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 6px 0;

  /* ── 隱藏技術：clip-path 裁切至零尺寸，不影響排版也不佔空間 ── */
  clip: rect(0 0 0 0);
  /* 舊版瀏覽器備援 */
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;

  /* 焦點出現時的滑入動畫 */
  transition: clip-path 0.15s ease, width 0.15s ease,
    height 0.15s ease, outline-color 0.15s ease;
}

.tadnav-skip:focus,
.tadnav-skip:focus-visible {
  /* 還原尺寸，讓元素完整顯示 */
  clip: auto;
  clip-path: none;
  width: auto;
  height: auto;
  overflow: visible;
  white-space: normal;

  /* 明顯焦點外框：黃框 + 黑色陰影雙層，確保任何底色都清晰可見 */
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  outline-offset: 3px;
  box-shadow: 0 0 0 calc(var(--tadnav-focus-width) + 3px) var(--tadnav-focus-shadow-color);
}

/* ── Inner ──────────────────────────────────── */
.tadnav-inner {
  display: flex;
  align-items: stretch;
  width: 100%;
  max-width: var(--tadnav-inner-max-width);
  margin: 0 auto;
  padding: 0 1rem;
  min-height: var(--tadnav-nav-min-height);
}

/* ── Brand ──────────────────────────────────── */
.tadnav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--tadnav-brand-color);
  font-size: var(--tadnav-item-font-size);
  font-weight: 700;
  padding: 0 1rem 0 0;
  white-space: nowrap;
  text-decoration: none;
  flex-shrink: 0;
}

.tadnav-brand:focus-visible {
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 calc(var(--tadnav-focus-width) + 2px) var(--tadnav-focus-shadow-color);
  border-radius: 3px;
}

/* ── Hamburger Toggle ───────────────────────── */
.tadnav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
  border-radius: 6px;
  transition: background 0.2s;
  flex-shrink: 0;
}

.tadnav-toggle:hover {
  background: var(--tadnav-toggle-hover-bg);
}

.tadnav-toggle:focus-visible {
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  outline-offset: 2px;
  box-shadow: 0 0 0 calc(var(--tadnav-focus-width) + 2px) var(--tadnav-focus-shadow-color);
  background: var(--tadnav-toggle-hover-bg);
}

.tadnav-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--tadnav-toggle-color);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.tadnav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.tadnav-toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}

.tadnav-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ══════════════════════════════════════════════
 * 桌機版：頂層 Menu
 * ══════════════════════════════════════════════ */
.tadnav-menu {
  display: flex;
  align-items: stretch;
  list-style: none;
  flex: 1;
  flex-wrap: nowrap;
  overflow: hidden;
}

.tadnav-menu.tadnav-menu-wrap {
  flex-wrap: wrap;
  align-items: flex-start;
  overflow: visible;
  align-content: flex-start;
}

.tadnav-menu.tadnav-menu-scroll {
  overflow-x: auto;
  overflow-y: visible;
  scrollbar-width: none;
  -ms-overflow-style: none;
  scroll-behavior: smooth;
}

.tadnav-menu.tadnav-menu-scroll::-webkit-scrollbar {
  display: none;
}

.tadnav-menu>li.tadnav-spacer {
  flex-grow: 1;
  pointer-events: none;
}

.tadnav-menu>li {
  position: relative;
  display: flex;
  align-items: stretch;
  flex-shrink: 0;
}

/* ── 頂層按鈕 ───────────────────────────────── */
.tadnav-menu>li>a[href],
.tadnav-menu>li>button.tadnav-submenu-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: var(--tadnav-item-padding-y) var(--tadnav-item-padding-x);
  color: var(--tadnav-item-color);
  background: var(--tadnav-item-bg);
  font-size: var(--tadnav-item-font-size);
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.18s, color 0.18s;
  border-bottom: 3px solid transparent;
  position: relative;
  z-index: 1;
}

.tadnav-menu>li>a[href]:hover,
.tadnav-menu>li>button.tadnav-submenu-toggle:hover,
.tadnav-menu>li>button.tadnav-submenu-toggle[aria-expanded="true"] {
  background: var(--tadnav-item-hover-bg);
  color: var(--tadnav-item-hover-color);
  border-bottom-color: var(--tadnav-item-accent);
  outline: none;
}

.tadnav-menu>li>a[href]:focus-visible,
.tadnav-menu>li>button.tadnav-submenu-toggle:focus-visible {
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  outline-offset: -2px;
  box-shadow: inset 0 0 0 calc(var(--tadnav-focus-width) + 2px) var(--tadnav-focus-shadow-color);
  background: var(--tadnav-item-hover-bg);
  color: var(--tadnav-item-hover-color);
}

/* ── 箭頭 ───────────────────────────────────── */
.tadnav-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7em;
  transition: transform 0.2s;
  margin-left: 0.1rem;
  flex-shrink: 0;
}

.tadnav-arrow::after {
  content: "\f078";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}

button[aria-expanded="true"]>.tadnav-arrow {
  transform: rotate(180deg);
}

.tadnav-submenu .tadnav-arrow::after {
  content: "\f054";
}

.tadnav-submenu button[aria-expanded="true"]>.tadnav-arrow {
  transform: rotate(90deg);
}

/* ══════════════════════════════════════════════
 * 桌機版：子選單面板
 * ══════════════════════════════════════════════ */
.tadnav-submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: var(--tadnav-sub-min-width);
  background: var(--tadnav-sub-bg);
  border-radius: 0 0 8px 8px;
  box-shadow: var(--tadnav-sub-shadow);
  list-style: none;
  z-index: 99999;
  border-top: 3px solid var(--tadnav-sub-border);
  overflow: visible;

  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.tadnav-submenu[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.tadnav-submenu>li {
  position: relative;
  z-index: auto;
}

.tadnav-submenu>li:hover,
.tadnav-submenu>li:focus-within {
  z-index: 1;
}

/* ── 捲動按鈕 ───────────────────────────────── */
.tadnav-scroll-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: var(--tadnav-scroll-btn-height);
  background: var(--tadnav-scroll-btn-bg);
  color: var(--tadnav-scroll-btn-color);
  cursor: pointer;
  border: none;
  font-size: 0.75rem;
  user-select: none;
  transition: background 0.15s;
  list-style: none;
}

.tadnav-scroll-btn:hover,
.tadnav-scroll-btn:focus-visible {
  background: var(--tadnav-scroll-btn-hover-bg);
  outline: none;
}

.tadnav-scroll-btn:focus-visible {
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  outline-offset: -2px;
}

.tadnav-scroll-btn[aria-disabled="true"] {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.tadnav-scroll-up {
  border-radius: 0;
}

.tadnav-scroll-down {
  border-radius: 0 0 8px 8px;
}

/* ── is-right ───────────────────────────────── */
.tadnav-menu>li.is-right>.tadnav-submenu {
  left: auto;
  right: 0;
}

/* ── 巢狀子選單（第二層以上，桌機） ─────────── */
.tadnav-submenu .tadnav-submenu {
  top: 0;
  left: 100%;
  border-radius: 0 8px 8px 8px;
  border-top: none;
  border-left: 3px solid var(--tadnav-sub-border);
  z-index: 100000;
}

.tadnav-menu>li.is-right .tadnav-submenu .tadnav-submenu {
  left: auto;
  right: 100%;
  border-radius: 8px 0 8px 8px;
  border-left: none;
  border-right: 3px solid var(--tadnav-sub-border);
}

/* ── 碰撞偵測翻轉 ───────────────────────────── */
.tadnav-submenu.tadnav-flip-x-root {
  left: auto;
  right: 0;
}

.tadnav-submenu.tadnav-flip-y-root {
  top: auto;
  bottom: 100%;
  border-radius: 8px 8px 0 0;
  border-top: none;
  border-bottom: 3px solid var(--tadnav-sub-border);
  transform: translateY(6px);
}

.tadnav-submenu.tadnav-flip-y-root[data-open="true"] {
  transform: translateY(0);
}

.tadnav-submenu .tadnav-submenu.tadnav-flip-x {
  left: auto;
  right: 100%;
  border-radius: 8px 0 8px 8px;
  border-left: none;
  border-right: 3px solid var(--tadnav-sub-border);
}

.tadnav-submenu .tadnav-submenu.tadnav-flip-y {
  top: auto;
  bottom: 0;
}

/* ── 子選單項目（桌機） ─────────────────────── */
.tadnav-submenu>li>a[href],
.tadnav-submenu>li>button.tadnav-submenu-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: var(--tadnav-sub-item-padding-y) var(--tadnav-sub-item-padding-x);
  color: var(--tadnav-sub-item-color);
  background: var(--tadnav-sub-item-bg);
  font-size: var(--tadnav-sub-item-font-size);
  text-decoration: none;
  border: none;
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
  border-bottom-width: var(--tadnav-sub-divider-width);
  border-bottom-style: solid;
  border-bottom-color: var(--tadnav-sub-divider);
  position: relative;
  z-index: 1;
  scroll-margin-top: 4rem;
  scroll-margin-bottom: 1rem;
}

.tadnav-submenu>li:last-child>a[href],
.tadnav-submenu>li:last-child>button.tadnav-submenu-toggle {
  border-bottom: none;
}

.tadnav-submenu>li>a[href]:hover,
.tadnav-submenu>li>button.tadnav-submenu-toggle:hover,
.tadnav-submenu>li>button.tadnav-submenu-toggle[aria-expanded="true"] {
  background: var(--tadnav-sub-item-hover-bg);
  color: var(--tadnav-sub-item-hover-color);
  outline: none;
}

.tadnav-submenu>li>a[href]:focus-visible,
.tadnav-submenu>li>button.tadnav-submenu-toggle:focus-visible {
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-shadow-color);
  outline-offset: -2px;
  box-shadow: inset 0 0 0 calc(var(--tadnav-focus-width) + 2px) var(--tadnav-focus-color);
  background: var(--tadnav-sub-item-hover-bg);
  color: var(--tadnav-sub-item-hover-color);
}

/* ── Skip Link ──────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--tadnav-sub-border);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 6px 6px;
  font-size: 0.9rem;
  z-index: 100000;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
  outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color);
  box-shadow: 0 0 0 calc(var(--tadnav-focus-width) + 2px) var(--tadnav-focus-shadow-color);
}

/* ══════════════════════════════════════════════
 * 手機 / 放大 400% 模式
 * 核心：強制單欄手風琴，多層縮排色彩區隔
 * ══════════════════════════════════════════════ */
@media (max-width: 768px) {

  /* ── 顯示漢堡按鈕 ── */
  .tadnav-toggle {
    display: flex;
  }

  /* ── Inner 改為換行排列 ── */
  .tadnav-inner {
    flex-wrap: wrap;
    padding: 0.5rem 1rem;
    align-items: center;
  }

  .tadnav-brand {
    flex: 1;
  }

  /* ══ 頂層選單：垂直單欄 ══ */
  .tadnav-menu {
    display: none;
    /* 預設隱藏 */
    flex-direction: column;
    width: 100%;
    padding: 0.25rem 0 0.5rem;
    flex: none;
    overflow: visible;
    /* 允許子選單展開 */
    flex-wrap: nowrap;
    background: var(--tadnav-mobile-bg);
  }

  .tadnav-menu[data-mobile-open="true"] {
    display: flex;
  }

  /* ── 所有 li 強制 100% 寬、取消絕對定位 ── */
  .tadnav-menu>li,
  .tadnav-submenu>li {
    width: 100% !important;
    position: static !important;
    display: block !important;
  }

  .tadnav-menu>li.tadnav-spacer {
    display: none !important;
  }

  /* ══ 頂層項目按鈕 ══ */
  .tadnav-menu>li>a[href],
  .tadnav-menu>li>button.tadnav-submenu-toggle {
    display: flex;
    width: 100%;
    padding: 0.8rem 1.1rem;
    border-bottom: 1px solid var(--tadnav-mobile-item-border);
    border-left: none;
    justify-content: flex-start;
    font-size: var(--tadnav-item-font-size);
    white-space: normal;
    word-break: break-word;
    scroll-margin-top: 3rem;
  }

  .tadnav-menu>li>button.tadnav-submenu-toggle>.tadnav-arrow {
    margin-left: auto;
  }

  /* ══════════════════════════════════════════
   * ★★★ 手風琴子選單：完全覆蓋桌機版樣式 ★★★
   * 所有層級統一處理
   * ══════════════════════════════════════════ */
  .tadnav-submenu,
  .tadnav-submenu .tadnav-submenu,
  .tadnav-submenu .tadnav-submenu .tadnav-submenu {
    /* 覆蓋桌機絕對定位 */
    position: static !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    float: none !important;

    /* 覆蓋桌機動畫狀態 */
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    pointer-events: auto !important;

    /* 手風琴收合 */
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.32s ease;

    /* 外觀重設 */
    box-shadow: none !important;
    border: none !important;
    border-radius: 0 !important;
    min-width: 0 !important;
    width: auto !important;
    z-index: auto !important;
    display: block !important;
    /* 不用 flex，用 block + max-height */
  }

  /* ★ 展開狀態 */
  .tadnav-submenu[data-open="true"],
  .tadnav-submenu .tadnav-submenu[data-open="true"],
  .tadnav-submenu .tadnav-submenu .tadnav-submenu[data-open="true"] {
    max-height: var(--tadnav-accordion-max-height);
  }

  /* ── 捲動按鈕隱藏 ── */
  .tadnav-scroll-btn {
    display: none !important;
  }

  /* ══ 第一層子選單（L1）：淺色背景 ══ */
  .tadnav-menu>li>.tadnav-submenu {
    background: var(--tadnav-mobile-sub-l1-bg) !important;
    border-left: 3px solid var(--tadnav-mobile-sub-l1-border) !important;
    margin-left: 0.75rem !important;
  }

  .tadnav-menu>li>.tadnav-submenu>li>a[href],
  .tadnav-menu>li>.tadnav-submenu>li>button.tadnav-submenu-toggle {
    padding-left: 1.5rem;
    font-size: 0.95rem;
  }

  /* ══ 第二層子選單（L2）：中色背景 ══ */
  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu {
    background: var(--tadnav-mobile-sub-l2-bg) !important;
    border-left: 3px solid var(--tadnav-mobile-sub-l2-border) !important;
    margin-left: 0.75rem !important;
  }

  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu>li>a[href],
  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu>li>button.tadnav-submenu-toggle {
    padding-left: 2.25rem;
    font-size: 0.9rem;
  }

  /* ══ 第三層子選單（L3）：深色背景 ══ */
  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu>li>.tadnav-submenu {
    background: var(--tadnav-mobile-sub-l3-bg) !important;
    border-left: 3px solid var(--tadnav-mobile-sub-l3-border) !important;
    margin-left: 0.75rem !important;
  }

  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu>li>.tadnav-submenu>li>a[href],
  .tadnav-menu>li>.tadnav-submenu>li>.tadnav-submenu>li>.tadnav-submenu>li>button.tadnav-submenu-toggle {
    padding-left: 3rem;
    font-size: 0.85rem;
  }

  /* ══ 子選單內所有項目按鈕通用樣式 ══ */
  .tadnav-submenu>li>a[href],
  .tadnav-submenu>li>button.tadnav-submenu-toggle {
    display: flex !important;
    width: 100% !important;
    color: var(--tadnav-mobile-sub-color) !important;
    background: transparent !important;
    border-bottom: 1px solid var(--tadnav-mobile-item-border) !important;
    border-radius: 0 !important;
    white-space: normal !important;
    word-break: break-word !important;
    text-align: left !important;
    padding-top: 0.65rem !important;
    padding-bottom: 0.65rem !important;
    padding-right: 1.1rem !important;
    justify-content: flex-start !important;
    scroll-margin-top: 3rem;
    scroll-margin-bottom: 1rem;
  }

  .tadnav-submenu>li>button.tadnav-submenu-toggle>.tadnav-arrow {
    margin-left: auto !important;
  }

  /* 子選單箭頭改為上下方向 */
  .tadnav-submenu .tadnav-arrow::after {
    content: "\f078" !important;
  }

  .tadnav-submenu button[aria-expanded="true"]>.tadnav-arrow {
    transform: rotate(180deg) !important;
  }

  /* ══ 確保手機版獲得焦點時能出現完整清楚的框線及背景變化 ══ */
  .tadnav-menu>li>a[href]:focus-visible,
  .tadnav-menu>li>button.tadnav-submenu-toggle:focus-visible,
  .tadnav-submenu>li>a[href]:focus-visible,
  .tadnav-submenu>li>button.tadnav-submenu-toggle:focus-visible,
  .tadnav-wrapper :where(input, select, textarea):focus-visible {
    outline: var(--tadnav-focus-width) solid var(--tadnav-focus-color) !important;
    outline-offset: -3px !important;
    box-shadow: none !important;
    background-color: var(--tadnav-mobile-focus-bg) !important;
    color: var(--tadnav-mobile-focus-color) !important;
  }

  /* ── is-right 在手機模式下重設 ── */
  .tadnav-menu>li.is-right>.tadnav-submenu,
  .tadnav-menu>li.is-right .tadnav-submenu .tadnav-submenu {
    left: auto !important;
    right: auto !important;
  }
}

/* ══════════════════════════════════════════════
 * 手機版淺色主題（mobileNavTheme: 'light'）
 * 當導覽列底色為淡色系、文字為深色系時，
 * 子選單改用半透明白色疊加，避免文字難以辨識。
 * ══════════════════════════════════════════════ */
.tadnav-wrapper[data-nav-theme="light"] {
  /* 主選單展開背景 */
  --tadnav-mobile-bg: rgba(255, 255, 255, 0.88);

  /* 各層子選單背景（白色疊加，層層加深） */
  --tadnav-mobile-sub-l1-bg: rgba(255, 255, 255, 0.20);
  --tadnav-mobile-sub-l2-bg: rgba(255, 255, 255, 0.30);
  --tadnav-mobile-sub-l3-bg: rgba(255, 255, 255, 0.38);

  /* 縮排邊線色（黑色半透明） */
  --tadnav-mobile-sub-l1-border: rgba(0, 0, 0, 0.20);
  --tadnav-mobile-sub-l2-border: rgba(0, 0, 0, 0.14);
  --tadnav-mobile-sub-l3-border: rgba(0, 0, 0, 0.09);

  /* 分隔線與文字色 */
  --tadnav-mobile-sub-border: rgba(0, 0, 0, 0.18);
  --tadnav-mobile-sub-color: rgba(0, 0, 0, 0.88);
  --tadnav-mobile-item-border: rgba(0, 0, 0, 0.10);

  /* focus-visible 高亮（淺色底用深色疊加） */
  --tadnav-mobile-focus-bg: rgba(0, 0, 0, 0.09);
  --tadnav-mobile-focus-color: var(--tadnav-item-color);

  /* 漢堡按鈕顏色（淺色主題下改為深灰色/半透明黑，避免在淡色底上看不清） */
  --tadnav-toggle-color: rgba(0, 0, 0, 0.70);
  --tadnav-toggle-hover-bg: rgba(0, 0, 0, 0.06);
}