/* ═══════════════════════════════════
   LAWS VIEW
═══════════════════════════════════ */
/* 2026-05-12 v6 sticky 重構 C：單一 sticky 容器代替 3 個 stacked sticky。
   iOS 18 stacked-sticky bug 根治。.laws-tabs / .laws-search / .laws-chips-host
   都放進 .laws-sticky-stack，自己不再 sticky。
   2026-05-12 v7：min-height 鎖死 110px。原本 all tab (search ~64px) vs hot tab
   (chip ~50px) 切換差 14px → sticky 高度 mutate → iOS Safari 仍會 jitter
   （Reality Checker QA M1）。鎖 min-height 後切 tab sticky 高度恆定 → iOS 不抖。 */
/* 2026-05-13 v13：sticky → fixed 根治。
   v6-v12 都試過 sticky + 層層修補（min-height、:where transition: none、layer
   promotion 三件套），iPhone 15 Pro / 12 Pro / Chrome DevTools 12 Pro emulation
   仍抖；同樣配方 14 Pro Max / XR 不抖。差異 = 寬度 <400px。
   root cause：position: sticky 的 top offset 是主執行緒每 scroll frame 重算，
   在 DPR3 + 窄寬度下 sub-pixel rounding 跨 frame fraction 飄 → 抖。
   #bottom-nav 用 position: fixed 在所有寬度都 0 抖 → 同款配方套上 sticky-stack。
   fixed 完全 detach scroll，不參與主執行緒 sample。
   trade-off：height 鎖 118 (cover all tab worst case ~117)，hot tab 模式 stack
   下方留 ~14px gap（chip 50 + tabs 53 + border 1 = 104）。可接受。 */
.laws-sticky-stack {
  position: fixed; top: var(--hdr-h); left: 0; right: 0; z-index: 41;
  height: 118px;
  background: var(--c-bg);
  border-bottom: 1px solid var(--c-border);
  /* transition: none 保留 — defensive，fixed 後子樹本來就不參與 sticky sample */
  transition: none;
  /* layer promotion 三件套保留 — bottom-nav 沒上也 0 抖，但留著無害且加倍隔離 */
  transform: translateZ(0);
  will-change: transform;
  backface-visibility: hidden;
}
/* v13：stack 變 fixed 後 in-flow 沒了，view 內容會貼到 header 下方。
   pad 118 補回 stack 佔位高度。section 第一個 in-flow child (#law-list /
   #law-hot-list) 自動從 header bottom + stack height = 56 + 118 = 174 開始。 */
#view-laws { padding-top: 118px; }
/* 2026-05-12 v9：A 補丁。容器本身寫 transition: none 不夠 — iOS Safari 對 sticky
   容器的「整個子樹」做 compositor sub-pixel sampling，子樹任一 element 留著
   transition-property: all（即使 0s）也會引發抖。
   用 :where() 包住整個子樹規則，specificity 0 → 個別子元素（.laws-tab 等）
   想用自己的 transition 直接寫就會 win，不需 !important。 */
:where(#laws-sticky-stack *) {
  transition: none;
}
/* Laws sub-tabs (全部 / 高頻) */
.laws-tabs {
  display: flex; gap: 4px; padding: 8px 12px;
  background: var(--c-bg);
  transition: none;   /* v8：同 .laws-sticky-stack 一起斷 compositor 噪音 */
}
.laws-tab {
  flex: 1; padding: 10px 14px; font-size: .88rem; font-weight: 600;
  background: transparent; border: 1px solid transparent; border-radius: 8px;
  color: var(--c-muted); cursor: pointer;
  /* v9：原本 transition: all .15s，但 sticky 子樹 transition: all 會被 iOS Safari
     compositor 一直 sample 引發抖動。改成具體屬性白名單 — 保留 tab click 視覺回饋，
     但不波及其他 property。 */
  transition: background-color .15s, color .15s, border-color .15s, box-shadow .15s;
}
.laws-tab.active {
  background: var(--c-surface); color: var(--c-primary);
  border-color: var(--c-border); box-shadow: var(--shadow-sm);
}
@media (hover:hover) { .laws-tab:hover:not(.active) { color: var(--c-text); } }

/* 搜尋列 — 全部 tab 顯示，hot tab 隱藏（hidden class JS 控） */
.laws-search {
  background: var(--c-bg); border-top: 1px solid var(--c-border);
  padding: 12px 16px;
}
.laws-search.hidden { display: none; }
/* Chip host — hot tab 顯示，all tab 隱藏 */
.laws-chips-host {
  background: var(--c-bg); border-top: 1px solid var(--c-border);
  transition: none;   /* v8：同 .laws-sticky-stack 一起斷 compositor 噪音 */
}
.laws-chips-host.hidden { display: none; }
.laws-chips-host:not(.hidden) > .law-filter-chips { border-bottom: none; }

/* Hot laws view — padding 走上方 BS5 .law-hot-list 統一規則 */
.law-hot-list.hidden { display: none; }
.law-hot-loading { padding: 40px; text-align: center; color: var(--c-muted); }
.law-hot-hdr {
  padding: 18px 20px 14px; background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
}
.law-hot-hdr h2 {
  font-size: 1.18rem; font-weight: 700; margin: 0 0 4px;
  color: var(--c-text);
}
.law-hot-hdr p { font-size: .82rem; color: var(--c-muted); margin: 0 0 14px; }
.law-hot-progress { margin-bottom: 12px; }
.lhp-bar {
  width: 100%; height: 6px; background: var(--c-surface2);
  border-radius: 3px; overflow: hidden; margin-bottom: 4px;
}
.lhp-fill { height: 100%; background: var(--c-primary); transition: width .3s; }
.lhp-text { font-size: .76rem; color: var(--c-muted); font-variant-numeric: tabular-nums; }
.lhp-text strong { color: var(--c-text); }

.law-hot-exam-toggle {
  display: inline-flex; gap: 0; background: var(--c-surface2);
  border-radius: 999px; padding: 3px;
}
.lhe-btn {
  padding: 6px 16px; font-size: .82rem; font-weight: 600;
  background: transparent; border: none; color: var(--c-muted);
  border-radius: 999px; cursor: pointer; transition: all .15s;
}
.lhe-btn.active {
  background: var(--c-surface); color: var(--c-primary);
  box-shadow: var(--shadow-sm);
}

.law-filter-chips {
  /* 2026-05-12 v6：本身不再 sticky，由 .laws-sticky-stack 統一管。
     border-bottom 也砍掉，stack 容器接管 separator。
     2026-05-12 v7：flex-wrap: wrap 在 iPhone 15 Pro (393px) 把 13 chips
     wrap 成 5 行 ~178px tall → sticky chrome 累計 344px 佔 40% viewport
     → user「整個螢幕被占沒」。改水平 scroll 單行 50px。
     mask-image 不用（之前 .toc-scroll 踩過 iOS sticky+mask paint wobble），
     改用 inset box-shadow 做邊緣 fade 提示「右邊還有 chip」。
     scroll-padding-inline: 24px → Tab focus chip 自動滾到 fade 之外（a11y）。
     forced-colors 加 dashed border 替 fade（高對比模式 shadow 會 strip）。 */
  display: flex; gap: 6px; flex-wrap: nowrap;
  overflow-x: auto; overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  /* pan-x pan-y：手指放 chip 上水平滑切 chip，垂直滑時 bubble 到 body 捲頁
     （pan-x 單獨會吃掉垂直 swipe，user 點 chip 上想滾頁就卡住）。Code Reviewer + QA 雙抓。 */
  touch-action: pan-x pan-y;
  padding: 10px 16px; background: var(--c-bg);
  scrollbar-width: none;
  scroll-padding-inline: 24px;
  /* Edge fade 不用 inset box-shadow（c-bg 蓋 c-bg 看不到、dark mode 更糟）也不用
     mask-image（iOS sticky+mask paint wobble 踩過）。靠 chip 數量超過視寬時
     自然被 cut off 提示「右邊還有」— 13 個 chip 在 393px viewport 一定 overflow，
     視覺上看得到 chip 邊緣被切斷，user 自然知道可滑。 */
}
.law-filter-chips::-webkit-scrollbar { display: none; }
@media (forced-colors: active) {
  .law-filter-chips { border-inline: 1px dashed CanvasText; }
}
.law-filter-chip {
  flex: 0 0 auto;   /* nowrap 下必須，避免 chip 被擠扁 ellipsis */
  /* a11y 觸控目標：WCAG 2.5.8 AA 要求 24×24 CSS px。padding 8/14 + 字 .82rem
     → 約 32px 高、適合單手操作；gap 6 維持密度感不至於變太胖。 */
  min-height: 32px;
  padding: 8px 14px; font-size: .82rem; font-weight: 600;
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: 999px; color: var(--c-muted); cursor: pointer;
  transition: all .15s; white-space: nowrap;
  /* v8：chip 內含「全部 256 / 民法 50」數字，等寬數字鎖死每 chip 寬度，
     totalCnt 從 3 → 4 位（256 vs 1024）切換時 chip 不會因比例字寬重排。 */
  font-variant-numeric: tabular-nums;
}
.law-filter-chip:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}
.law-filter-chip.active {
  background: var(--c-primary); color: var(--c-primary-fg, #fff);
  border-color: var(--c-primary);
}
@media (hover:hover) {
  .law-filter-chip:hover:not(.active) { border-color: var(--c-primary); color: var(--c-primary); }
}

.hot-rows {
  padding: 0;
  /* v8：hot row 每筆有「N 次 / 近 N」數字，等寬鎖每列數字寬度避免列間
     line-height 取整微差 → 滾動時 row baseline 漂移 → user 感受 1px 抖。 */
  font-variant-numeric: tabular-nums;
}
.hot-row {
  display: flex; align-items: center; gap: 12px; width: 100%;
  padding: 12px 20px; background: var(--c-surface);
  border: none; border-bottom: 1px solid var(--c-border);
  cursor: pointer; text-align: left; font-family: inherit;
  transition: background .12s;
}
.hot-row.viewed { opacity: .7; }
.hot-row.viewed .hot-arrow { color: var(--c-success); }
@media (hover:hover) {
  .hot-row:hover { background: var(--c-surface2); }
}
.hot-row:active { background: var(--c-surface2); }
.hot-heat { font-size: .92rem; flex-shrink: 0; min-width: 50px; }
.hot-meta { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.hot-law { font-size: .78rem; color: var(--c-muted); font-weight: 500; }
.hot-art { font-size: .98rem; color: var(--c-text); font-weight: 700; font-family: var(--ff-mono); }
.hot-cnt {
  display: flex; flex-direction: column; align-items: flex-end; gap: 2px;
  flex-shrink: 0; font-size: .82rem; color: var(--c-text);
}
.hot-cnt strong { color: var(--c-primary); font-size: 1rem; }
.hot-cnt small { font-size: .68rem; color: var(--c-muted); }
.hot-arrow { color: var(--c-muted); font-size: 1.1rem; flex-shrink: 0; width: 14px; text-align: center; }

/* Inline-expand 高頻速記條文（點 row 直接展開不跳頁） */
.hot-row-wrap { display: block; }
.hot-row-body {
  background: var(--c-paper); border-bottom: 1px solid var(--c-border);
  padding: 14px 20px 16px;
  animation: hotInlineFadeIn .18s ease-out;
}
@keyframes hotInlineFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hot-inline-loading, .hot-inline-empty, .hot-inline-deleted {
  font-size: .85rem; color: var(--c-muted); padding: 4px 0;
}
.hot-inline-deleted { color: var(--c-warning, #b45309); font-weight: 600; }
.hot-inline-art {
  font-size: .92rem; line-height: 1.75; color: var(--c-text);
  white-space: pre-wrap; word-break: break-word;
  border-left: 3px solid var(--c-primary); padding: 2px 0 2px 12px;
  font-family: 'Noto Serif TC', 'PingFang TC', serif;
}
.hot-inline-actions {
  display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap;
}
.hot-inline-open, .hot-inline-quiz {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px; border-radius: 8px;
  background: var(--c-surface2); border: 1px solid var(--c-border);
  font-size: .8rem; color: var(--c-text); cursor: pointer;
  transition: all .12s;
}
@media (hover:hover) {
  .hot-inline-open:hover, .hot-inline-quiz:hover {
    background: var(--c-surface3); border-color: var(--c-primary);
  }
}
/* < sm 小手機收緊內距 */
@media (max-width: 479.98px) {
  .hot-row-body { padding: 12px 16px 14px; }
  .hot-inline-art { font-size: .88rem; }
}

/* Inline high-freq chip on explanation feedback */
.hot-chip {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 10px; padding: 6px 12px;
  background: linear-gradient(135deg, rgba(217,119,6,.10), rgba(178,58,43,.06));
  border: 1px solid rgba(217,119,6,.30); border-radius: 999px;
  font-size: .82rem; font-weight: 600; color: var(--c-warning, #b45309);
  cursor: pointer; transition: all .15s; font-family: inherit;
}
@media (hover:hover) {
  .hot-chip:hover {
    background: linear-gradient(135deg, rgba(217,119,6,.20), rgba(178,58,43,.10));
    transform: translateY(-1px);
  }
}
[data-theme="dark"] .hot-chip {
  background: linear-gradient(135deg, rgba(229,178,106,.14), rgba(224,113,88,.08));
  border-color: rgba(229,178,106,.40);
  color: var(--c-warning);
}
/* < sm 小手機收緊內距 */
@media (max-width: 479.98px) {
  .law-hot-hdr { padding: 14px 16px 12px; }
  .law-hot-hdr h2 { font-size: 1.05rem; }
  .law-filter-chips { padding: 10px 14px; gap: 5px; }
  .law-filter-chip { padding: 4px 10px; font-size: .72rem; }
  .hot-row { padding: 11px 16px; gap: 10px; }
}
.search-wrap { position: relative; }
.search-wrap svg {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; color: var(--c-muted); pointer-events: none;
}
.search-inp {
  width: 100%; padding: 9px 14px 9px 36px;
  background: var(--c-surface); border: 1.5px solid var(--c-border);
  border-radius: var(--r-md);
  /* 16px to prevent iOS Safari auto-zoom on focus */
  font-size: 16px; color: var(--c-text);
  transition: border-color .15s;
}
.search-inp:focus { outline: none; border-color: var(--c-primary); }

/* 2026-05-15 v19: 套 BS5 .container 規範 (對齊 q-area / law-body / stats-wrap)
   桌機卡片內容置中, 不再貼齊 #main 左右邊 */
.law-groups,
.law-hot-list {
  width: 100%;
  margin: 0 auto;
  padding: 10px 15px 80px;   /* bottom 留 80 給 bottom-nav clearance */
  box-sizing: border-box;
}
@media (min-width: 576px) {
  .law-groups, .law-hot-list {
    max-width: min(540px, calc(100% - 24px));
    padding-left: 31px; padding-right: 31px;
  }
}
@media (min-width: 768px) {
  .law-groups, .law-hot-list { max-width: min(750px, calc(100% - 24px)); }
}
@media (min-width: 992px) {
  .law-groups, .law-hot-list { max-width: min(970px, calc(100% - 48px)); }
}
@media (min-width: 1200px) {
  .law-groups, .law-hot-list { max-width: min(1170px, calc(100% - 64px)); }
}
/* sticky stack 內元素也跟著置中 (tabs / search / chips 在 .laws-sticky-stack 內 inline-center) */
.laws-sticky-stack > .laws-tabs,
.laws-sticky-stack > .laws-search,
.laws-sticky-stack > .laws-chips-host {
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}
@media (min-width: 576px) {
  .laws-sticky-stack > .laws-tabs,
  .laws-sticky-stack > .laws-search,
  .laws-sticky-stack > .laws-chips-host { max-width: min(540px, calc(100% - 24px)); }
}
@media (min-width: 768px) {
  .laws-sticky-stack > .laws-tabs,
  .laws-sticky-stack > .laws-search,
  .laws-sticky-stack > .laws-chips-host { max-width: min(750px, calc(100% - 24px)); }
}
@media (min-width: 992px) {
  .laws-sticky-stack > .laws-tabs,
  .laws-sticky-stack > .laws-search,
  .laws-sticky-stack > .laws-chips-host { max-width: min(970px, calc(100% - 48px)); }
}
@media (min-width: 1200px) {
  .laws-sticky-stack > .laws-tabs,
  .laws-sticky-stack > .laws-search,
  .laws-sticky-stack > .laws-chips-host { max-width: min(1170px, calc(100% - 64px)); }
}

/* Exam block */
.law-exam-block { margin-bottom: 16px; }
.law-exam-hdr {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--r-md);
  background: var(--c-surface2); border-left: 3px solid;
  margin-bottom: 6px;
}
.law-exam-name { font-size: .92rem; font-weight: 800; flex: 1; }

/* Subject block */
.law-subj-block { margin-bottom: 6px; }
.law-subj-btn {
  width: 100%; display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; border-radius: var(--r-md);
  background: var(--c-surface); border: 1px solid var(--c-border);
  font-size: .85rem; font-weight: 700; color: var(--c-text);
  cursor: pointer; transition: all .15s; text-align: left;
}
.law-subj-btn:hover { background: var(--c-surface2); }
.subj-num {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--c-primary-10); color: var(--c-primary);
  font-size: .72rem; font-weight: 800; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.subj-name { flex: 1; }
.grp-cnt { font-size: .7rem; padding: 2px 7px; background: var(--c-surface2); color: var(--c-muted); border-radius: 10px; font-weight: 600; flex-shrink: 0; }
.law-subj-btn .chev { width: 15px; height: 15px; color: var(--c-muted); transition: transform .2s; flex-shrink: 0; }
.law-subj-btn.open .chev { transform: rotate(180deg); }

.law-items { display: none; padding: 4px 0 4px 12px; }
.law-subj-btn.open + .law-items { display: block; }
/* Legacy support */
.law-group-btn.open + .law-items { display: block; }

.law-card {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; border-radius: var(--r-sm);   /* 加大觸控區、原 10px 太擠 */
  background: var(--c-surface); border: 1px solid var(--c-border);
  margin-bottom: 6px; cursor: pointer; transition: all .15s;
}
.law-card:hover {
  border-color: var(--c-primary);
  background: var(--c-primary-10);
}
.law-card:hover .law-card-chev {
  transform: translateX(3px);
  color: var(--c-primary);
}
.law-card.unavailable { cursor: default; opacity: .6; }
.law-card.unavailable:hover { border-color: var(--c-border); background: var(--c-surface); }
.law-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-primary); flex-shrink: 0; }
.law-dot.unavail { background: var(--c-muted); }
.law-card-body { flex: 1; min-width: 0; }
.law-card h4 {
  font-family: var(--ff-sans-cn);
  font-size: .92rem;          /* 原 .86 略小、提到 .92 中文閱讀更清楚 */
  font-weight: 500;
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  line-height: 1.4;
}
.law-note { font-size: .68rem; color: var(--c-muted); background: var(--c-surface2); padding: 1px 7px; border-radius: 8px; font-weight: 500; }
.law-meta { font-size: .73rem; color: var(--c-muted); margin-top: 2px; }
/* › chevron — clickability 一秒看見（5 人 mesh：Aiko） */
.law-card-chev {
  width: 14px; height: 14px;
  color: var(--c-muted);
  flex-shrink: 0;
  transition: transform .2s ease, color .2s ease;
}
.law-search-results { padding: 4px 0; }

/* 「法規名+條號」直接跳轉卡 — 朱印紅高亮、最上方 */
.law-direct-jump { margin-bottom: 10px; }
.law-direct-jump .art-search-hdr {
  color: var(--c-vermilion, var(--c-primary));
  font-weight: 700;
}
.law-direct-card {
  border-color: var(--c-vermilion, var(--c-primary)) !important;
  background: color-mix(in oklch, var(--c-vermilion, var(--c-primary)) 6%, var(--c-surface)) !important;
  display: flex; align-items: center; gap: 12px;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.law-direct-card:hover {
  transform: translateY(-1px);
  background: color-mix(in oklch, var(--c-vermilion, var(--c-primary)) 12%, var(--c-surface)) !important;
  box-shadow: 0 6px 16px -8px color-mix(in oklch, var(--c-vermilion, var(--c-primary)) 35%, transparent);
}
.law-direct-card .law-dot {
  background: var(--c-vermilion, var(--c-primary)) !important;
}
.law-direct-art {
  font-family: var(--ff-mono, monospace);
  color: var(--c-vermilion, var(--c-primary));
  font-weight: 800;
  letter-spacing: .02em;
  margin-left: 4px;
}
.law-direct-arrow {
  flex-shrink: 0;
  font-size: 1.3rem; font-weight: 700;
  color: var(--c-vermilion, var(--c-primary));
  margin-left: auto;
  transition: transform .18s ease;
}
.law-direct-card:hover .law-direct-arrow { transform: translateX(4px); }
.law-no-items {
  padding: 10px 12px; border-radius: var(--r-sm);
  font-size: .8rem; color: var(--c-muted); font-style: italic;
  background: var(--c-surface2); border: 1px dashed var(--c-border);
}

/* Bookmark summary panel above law list */
.bookmarks-panel {
  margin: 0 0 14px 0; padding: 12px 14px;
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--r-md);
}
.bookmarks-hdr {
  font-size: .78rem; font-weight: 700; color: var(--c-muted);
  text-transform: uppercase; letter-spacing: .06em; margin-bottom: 8px;
}
.bookmarks-list {
  display: flex; flex-wrap: wrap; gap: 6px;
}
.bookmark-chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 20px; font-size: .78rem; font-weight: 600;
  background: var(--c-primary-10); color: var(--c-primary);
  border: 1px solid var(--c-primary-20); cursor: pointer; transition: all .15s;
}
.bookmark-chip:hover { background: var(--c-primary-20); }
.bookmark-chip-cnt {
  font-size: .7rem; background: var(--c-primary); color: #fff;
  border-radius: 10px; padding: 0 5px; min-width: 16px; text-align: center;
}

/* Legacy group button (kept for backward compat) */
.law-group-btn {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; border-radius: var(--r-md);
  background: var(--c-surface); border: 1px solid var(--c-border);
  font-size: .88rem; font-weight: 700; color: var(--c-text);
  cursor: pointer; transition: all .15s;
}

/* ═══════════════════════════════════
   LAW DETAIL VIEW
═══════════════════════════════════ */
/* Sticky wrapper: back-bar + jump bar always visible */
/* 2026-05-13 v13：sticky → fixed 根治 detail page jitter（user 回報
   #law-collapsible-bars 在 iPhone 15 Pro / 12 Pro / Chrome DevTools 12 Pro
   仍抖到不行）。同 .laws-sticky-stack v13 配方 — sticky 主執行緒每 frame
   重算 offset，DPR3 + 窄寬度組合下 sub-pixel rounding 飄；fixed 完全脫離
   scroll sample。
   height 不鎖（detail page progress-row / aux-rows 動態顯示，height 變動 ~28-180）
   → JS (_updateLawJumpOffsetVar) 寫 --law-hdr-h 同步 #view-law-detail padding-top。
   mesh fix #2 確保 progress text 改字不會觸發 observer，hdr-h 只在 view 進入 /
   resize / orientationchange 更新。 */
.law-sticky-header {
  position: fixed; top: var(--hdr-h); left: 0; right: 0; z-index: 40;
  background: var(--c-bg);
  transition: none;
  /* layer promotion 三件套保留 — bottom-nav 同款 defensive */
  transform: translateZ(0);
  will-change: transform;
  backface-visibility: hidden;
}
/* v13：sticky-header 變 fixed 後 in-flow 沒了，articles 會貼到主 header 下。
   --law-hdr-h 由 JS 同步 sticky 實際高度。fallback 152 covers 桌機典型場景。 */
#view-law-detail { padding-top: var(--law-hdr-h, 152px); }
/* 2026-05-12 v9：A 補丁。同 #laws-sticky-stack，sticky 子樹 132 個後代每個都掛
   transition: all 預設值，iOS Safari compositor sample 整個子樹 → wobble。
   :where() specificity 0 → .law-progress-fill 等需要動畫的元素自己 declare 就 win。 */
:where(.law-sticky-header *) {
  transition: none;
}
.law-detail-bar {
  background: var(--c-bg); border-bottom: 1px solid var(--c-border);
  padding: 10px 16px;
  display: flex; align-items: center; gap: 12px;
}
.law-detail-bar h2 { font-size: .98rem; font-weight: 700; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* 2026-05-15 v17 桌機 (≥1024px) — 3 個 sibling bar 各自獨立, 不再 JS 搬 toolbar.
   Bar 1 .law-detail-bar: 返回 / 標題 / 動作集 (回題目/搜尋/換法規/⋯)
   Bar 2 .law-toolbar: breadcrumb + 條號 nav + TTS
   Bar 3 .toc-bar: 章節 chips scroll */
@media (min-width: 1024px) {
  .law-detail-bar {
    padding: 8px 16px;
    gap: 10px;
    min-height: 48px;
  }
  .law-detail-bar > .back-btn {
    padding: 6px 8px;
    min-height: 36px;
  }
  .law-detail-bar h2 {
    flex: 1 1 auto;
    max-width: clamp(200px, 30vw, 400px);
    font-size: 1rem;
  }
  .law-detail-bar .law-updated-badge { font-size: .72rem; }
  .law-detail-bar .law-switch-btn {
    flex-shrink: 0;
    padding: 6px 12px;
    font-size: .82rem;
  }
  .law-detail-bar > .hdr-icon-btn {
    padding: 6px;
    min-height: 36px;
  }

  /* Bar 2 .law-toolbar 桌機: 置中, breadcrumb 左, nav 中, TTS 右 */
  .law-toolbar {
    padding: 6px 16px;
    gap: 12px;
    min-height: 44px;
    flex-wrap: nowrap;
  }
  .law-toolbar .law-bc { flex-shrink: 0; }
  .law-toolbar .law-nav-group { flex-shrink: 0; gap: 4px; }
  .law-toolbar .law-nav-btn { padding: 5px 10px; font-size: .82rem; }
  .law-toolbar .law-jump-wrap { padding: 2px 8px; font-size: .82rem; }
  .law-toolbar .law-jump-inp { width: 44px; font-size: .85rem; }
  .law-toolbar .law-tts-group { flex-shrink: 1; min-width: 0; gap: 6px; margin-left: auto; }
  .law-toolbar .law-tts-play { padding: 5px 12px; font-size: .82rem; }
  .law-toolbar .law-tts-settings-trigger { padding: 4px 8px; font-size: .78rem; }
  .law-toolbar #art-result { margin-left: 8px; font-size: .76rem; }

  /* Bar 3 toc-bar 桌機: chips full-width scroll */
  .toc-bar { padding: 4px 16px 6px; min-height: 36px; }
  .toc-bar > .toc-scroll-wrap { padding: 0; }

  .law-search-bar { padding: 7px 16px; }
}

/* ≥1280px: 給更多呼吸 */
@media (min-width: 1280px) {
  .law-detail-bar h2 { max-width: clamp(240px, 32vw, 480px); }
  .law-toolbar .law-nav-btn { padding: 6px 12px; font-size: .85rem; }
  .law-toolbar .law-tts-play { padding: 6px 14px; font-size: .85rem; }
}
/* 手機 sticky header 收緊：左右 padding 12 → 行距 8、按鈕間距 8、換法規只剩 icon */
@media (max-width: 540px) {
  .law-detail-bar { padding: 10px 14px; gap: 8px; }
  .law-detail-bar h2 { font-size: .92rem; }
  .law-switch-btn {
    padding: 0 !important;
    font-size: 0 !important;
    gap: 0 !important;
    width: 36px;   /* 觸控 ≥36，icon 16+padding ≈44 視覺 */
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .law-switch-btn svg { width: 18px !important; height: 18px !important; }
}
@media (max-width: 379.98px) {
  .law-detail-bar { padding: 8px 10px; gap: 6px; }
  .law-detail-bar h2 { font-size: .88rem; }
}

/* 2026-05-15 v17 — 3-bar flat 重構:
   .toc-bar 退化成「章節 chips only」(原 row 1), .law-toolbar 拉出來變獨立 sibling bar.
   廢掉 .toc-bar flex-direction:column + 兩 row 結構, 也不再有 JS DOM move toolbar 進 detail-bar */
.toc-bar {
  display: flex; align-items: center;
  padding: 4px 16px 6px;
  background: var(--c-surface2); border-bottom: 1px solid var(--c-border);
  min-height: 36px;
}
.toc-bar > .toc-scroll-wrap { width: 100%; min-height: 28px; }

/* Bar 2: .law-toolbar 自己一條 bar (sibling 於 .law-detail-bar / .toc-bar) */
.law-toolbar {
  display: flex; align-items: center;
  padding: 6px 16px;
  background: var(--c-bg); border-bottom: 1px solid var(--c-border);
  gap: 8px;
  min-height: 40px;
  flex-wrap: wrap;
}

/* breadcrumb 進 toolbar 當首子元素，serif-cn ink，截斷不換行 */
.law-bc {
  flex-shrink: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: clamp(80px, 22vw, 200px);
  font-family: var(--ff-serif-cn);
  font-size: .82rem;
  font-weight: 600;
  color: var(--c-ink, var(--c-text));
  padding: 0 6px 0 0;
  letter-spacing: -.005em;
  border-right: 1px solid var(--c-border);
  margin-right: 2px;
}
.law-bc:empty { display: none; }
@media (max-width: 540px) {
  .toc-bar { padding: 4px 10px 6px; gap: 4px; }
  .law-bc {
    max-width: clamp(56px, 22vw, 100px);
    font-size: .76rem;
    padding-right: 4px;
    margin-right: 0;
    border-right: none;   /* 手機空間吃緊砍掉分隔線，留 gap 即可 */
  }
}
@media (max-width: 380px) {
  /* 超窄機型（iPhone SE 1st / 舊 Android）— breadcrumb 隱藏給 nav+TTS 留空間
     法規名稱在上方 detail-bar 已有，藏掉不影響語意 */
  .law-bc { display: none; }
}

/* 2026-05-15 v17 重構: .law-collapsible-bars / .law-aux-rows wrapper 從 HTML 移除,
   這裡的 legacy no-op 規則一起拿掉。3-bar flat 結構直接 sticky-header 內 sibling. */

/* 進度條：sticky-header 第一個 child，永遠顯示 */
/* 2026-05-12 mesh fix #1：lock min-height + tabular-nums，防 _updateLawProgress
   每次 scroll 更新「目前 §N」字串時、數字寬度變化造成 row 高度抖（§1→§767→§1234-1
   會差幾 px）→ sticky-header 高度變 → ResizeObserver 觸發 layout 連鎖 → user
   感受到 1-2px jitter */
.law-sticky-header > .law-progress-row {
  position: relative;
  z-index: 2;
  background: var(--c-bg);
  min-height: 28px;
  contain: layout paint;
}
#law-progress-text {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* v17 重構: .law-aux-rows wrapper 從 HTML 拿掉, 連帶 legacy aux-hidden class 也廢掉. */

/* 高頻速記 — 朗讀全部按鈕（hero 內，僅有條文時顯示） */
.hot-play-all {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 12px;
  padding: 8px 16px;
  background: var(--c-vermilion, var(--c-primary));
  color: white;
  border: none; border-radius: 99px;
  font-family: var(--ff-serif-cn);
  font-size: 13.5px; font-weight: 700;
  letter-spacing: .02em;
  cursor: pointer;
  transition: filter .15s, transform .15s;
  box-shadow: 0 4px 14px -4px color-mix(in oklch, var(--c-vermilion, #b23a2b) 50%, transparent);
}
.hot-play-all:hover { filter: brightness(1.08); transform: translateY(-1px); }
[data-theme="dark"] .hot-play-all { color: var(--c-primary-fg, white); }

/* 序列播放時當前條文高亮 */
.law-article.seq-playing,
.hot-row.seq-playing {
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 10%, transparent) !important;
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: -1px;
  transition: background .3s, outline .3s;
}

/* ═══════════════════════════════════════
   ART-PLAIN · 白話解讀 (Phase 2.1 SPA render)
   2026-05-14 跟 build_freq_article_seo_pages.py SHARED_CSS .art-plain 同步
   2026-05-14 「看白話」按鈕（取代「加筆記」按鈕 slot, 筆記功能暫下架）
   ═══════════════════════════════════════ */
/* 空 mount 不佔 flex gap (避免無 summary 條的尾巴空白) */
.art-plain-btn-mount:empty { display: none; }
/* 看白話 button — 寄宿在 .art-action-row 內, 繼承 .art-action-row > button 基本樣式 */
.art-plain-btn {
  background: rgba(178, 58, 43, .08) !important;
  color: var(--c-vermilion, #b23a2b) !important;
  border-color: rgba(178, 58, 43, .25) !important;
}
.art-plain-btn[aria-expanded="true"] {
  background: var(--c-vermilion, #b23a2b) !important;
  color: #fff !important;
  border-color: var(--c-vermilion, #b23a2b) !important;
}
.art-plain-chevron {
  display: inline-block;
  font-size: 11px;
  line-height: 1;
  margin-left: 1px;
  transition: transform .2s ease;
}
.art-plain-btn[aria-expanded="true"] .art-plain-chevron {
  transform: rotate(180deg);
}
@media (hover: hover) {
  .art-plain-btn:hover {
    background: rgba(178, 58, 43, .15) !important;
    color: var(--c-vermilion, #b23a2b) !important;
    border-color: rgba(178, 58, 43, .4) !important;
  }
  .art-plain-btn[aria-expanded="true"]:hover {
    background: #9a3024 !important;
    color: #fff !important;
  }
}

.art-plain[data-collapsed="true"] {
  display: none;
}
.art-plain {
  margin: 14px 0 8px;
  padding: 16px 20px;
  border-radius: 10px;
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 5%, var(--c-surface));
  border-left: 3px solid var(--c-vermilion, #b23a2b);
  font-family: var(--ff-serif-cn, "Noto Serif TC", serif);
}
[data-theme="dark"] .art-plain {
  background: rgba(178, 58, 43, .10);
  border-left-color: #d96b60;
}
.art-plain-eyebrow {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-vermilion, #b23a2b);
  font-weight: 700;
  margin-bottom: 10px;
}
.art-plain-body {
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-text);
  margin: 0;
  text-wrap: pretty;
}
.art-plain-elements {
  margin: 12px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
}
.art-plain-elements li {
  margin: 3px 0;
  list-style: "・ ";
}
.art-plain-focus {
  margin-top: 10px;
  padding: 9px 13px;
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 6%, transparent);
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.7;
}
.art-plain-focus-label {
  display: inline-block;
  padding: 1px 8px;
  margin-right: 8px;
  background: var(--c-vermilion, #b23a2b);
  color: #fff;
  font-size: 11px;
  border-radius: 3px;
  letter-spacing: .1em;
  font-weight: 700;
}

/* Floating 序列播放控制條（右下角） */
.seq-player {
  position: fixed;
  right: 16px; bottom: 16px;
  z-index: 90;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  background: var(--c-surface);
  border: 1.5px solid var(--c-vermilion, var(--c-primary));
  border-radius: 12px;
  box-shadow: 0 12px 32px -8px color-mix(in oklch, var(--c-vermilion, #b23a2b) 28%, rgba(0,0,0,.18));
  font-family: var(--ff-serif-cn);
  max-width: calc(100vw - 32px);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .25s, transform .25s;
}
.seq-player.show { opacity: 1; transform: translateY(0); }
.seq-player .sp-info { min-width: 0; flex: 1; }
.seq-player .sp-label {
  font-size: 13px; font-weight: 700;
  color: var(--c-ink, var(--c-text));
  letter-spacing: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 220px;
  display: inline-flex; align-items: center; gap: 6px;
}
.seq-player .sp-progress {
  font-family: var(--ff-mono);
  font-size: 11px; color: var(--c-muted);
  letter-spacing: .05em; margin-top: 2px;
  font-feature-settings: 'tnum' 1;
}
/* loading 狀態：spinner + 整個 player 微脈動，讓使用者知道在載入不是當機 */
.seq-player.loading {
  border-color: color-mix(in oklch, var(--c-vermilion, #b23a2b) 70%, transparent);
  animation: sp-pulse 1.6s ease-in-out infinite;
}
.seq-player.loading .sp-label {
  color: var(--c-vermilion, var(--c-primary));
}
.sp-spinner {
  display: inline-block;
  width: 12px; height: 12px;
  border: 2px solid color-mix(in oklch, var(--c-vermilion, #b23a2b) 30%, transparent);
  border-top-color: var(--c-vermilion, var(--c-primary));
  border-radius: 50%;
  animation: sp-spin .8s linear infinite;
  flex-shrink: 0;
}
.seq-player:not(.loading) .sp-spinner { display: none; }
@keyframes sp-spin { to { transform: rotate(360deg); } }
@keyframes sp-pulse {
  0%,100% { box-shadow: 0 12px 32px -8px color-mix(in oklch, var(--c-vermilion, #b23a2b) 28%, rgba(0,0,0,.18)); }
  50%     { box-shadow: 0 12px 32px -4px color-mix(in oklch, var(--c-vermilion, #b23a2b) 55%, rgba(0,0,0,.18)); }
}
@media (prefers-reduced-motion: reduce) {
  .seq-player.loading { animation: none; }
  .sp-spinner { animation: none; }
}
.seq-player .sp-stop {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  background: var(--c-vermilion, var(--c-primary));
  color: white; border: none; border-radius: 99px;
  font-family: var(--ff-serif-cn);
  font-size: 13px; font-weight: 700;
  cursor: pointer; flex-shrink: 0;
  transition: filter .15s;
}
.seq-player .sp-stop:hover { filter: brightness(1.08); }
[data-theme="dark"] .seq-player .sp-stop { color: var(--c-primary-fg, white); }
@media (max-width: 540px) {
  .seq-player { right: 8px; bottom: 8px; padding: 10px 12px; gap: 8px; }
  .seq-player .sp-label { max-width: 130px; font-size: 12.5px; }
  .seq-player .sp-stop { padding: 5px 11px; font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .seq-player { transition: none; }
}

/* 2026-05-11：.home-tomorrow standalone 已移除，內容融入主卡 .sprint-tomorrow
   ht-* class 體系已退役，新 class 在 home-features.css 的 .sprint-tomorrow-* */

/* 60 秒快測 CTA（guest only — Sarah Chen 提案）*/
.home-quick-trial {
  position: relative;
  margin: clamp(20px, 3vw, 32px) auto 0;
  max-width: 540px;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--c-vermilion, var(--c-primary));
  color: white;
  border-radius: 14px;
  text-align: center;
  cursor: pointer;
  transition: transform .25s, box-shadow .25s, filter .15s;
  border: none;
  font-family: var(--ff-serif-cn);
  display: block; width: 100%;
  box-shadow: 0 10px 28px -10px color-mix(in oklch, var(--c-vermilion, #b23a2b) 50%, transparent);
}
.home-quick-trial:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
}
[data-theme="dark"] .home-quick-trial { color: var(--c-primary-fg, white); }
.home-quick-trial .qt-eyebrow {
  font-family: var(--ff-mono);
  font-size: clamp(11px, .85vw, 13px);
  letter-spacing: .12em;
  opacity: .85;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.home-quick-trial .qt-h {
  font-size: clamp(18px, 2vw, 26px);
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: 4px;
}
.home-quick-trial .qt-sub {
  font-size: clamp(13px, 1vw, 15px);
  opacity: .9;
  letter-spacing: .02em;
}

/* 60 秒快測結果 modal */
.quick-trial-result {
  position: fixed; inset: 0; z-index: 9998;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, .6); backdrop-filter: blur(6px);
  padding: 20px;
  opacity: 0;
  transition: opacity .3s;
}
.quick-trial-result.show { opacity: 1; }
.quick-trial-result .qtr-card {
  background: var(--c-surface);
  border: 2px solid var(--c-vermilion, var(--c-primary));
  border-radius: 16px;
  padding: 28px 24px 24px;
  max-width: min(440px, 100%);
  width: 100%;
  box-shadow: 0 24px 60px -12px rgba(0,0,0,.4);
  text-align: center;
  font-family: var(--ff-serif-cn);
  transform: translateY(20px) scale(.96);
  transition: transform .35s cubic-bezier(.2, .9, .3, 1.1);
}
.quick-trial-result.show .qtr-card { transform: translateY(0) scale(1); }
.qtr-eyebrow {
  font-family: var(--ff-mono);
  font-size: 11px; font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-vermilion);
  margin-bottom: 16px;
}
.qtr-score-row {
  display: flex; align-items: baseline; justify-content: center;
  gap: 18px; margin-bottom: 14px;
}
.qtr-score {
  font-family: var(--ff-serif-cn);
  font-size: 64px; font-weight: 900;
  line-height: 1;
  color: var(--c-vermilion);
  letter-spacing: -.04em;
  font-feature-settings: 'tnum' 1, 'lnum' 1;
}
.qtr-score small { font-size: .35em; opacity: .55; font-weight: 700; margin-left: 4px; }
.qtr-meta {
  text-align: left;
}
.qtr-pct {
  font-family: var(--ff-serif-cn);
  font-size: 22px; font-weight: 800;
  color: var(--c-ink, var(--c-text));
  margin-bottom: 2px;
}
.qtr-time {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--c-muted);
  letter-spacing: .03em;
}
.qtr-badge {
  display: inline-block;
  padding: 4px 16px;
  border-radius: 99px;
  font-family: var(--ff-serif-cn);
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: .03em;
}
.qtr-badge.qtb-high { background: var(--c-vermilion); color: white; }
[data-theme="dark"] .qtr-badge.qtb-high { color: var(--c-primary-fg, white); }
.qtr-badge.qtb-mid {
  background: color-mix(in oklch, #d4a847 20%, transparent);
  color: #a37c1f;
  border: 1px solid color-mix(in oklch, #d4a847 50%, transparent);
}
[data-theme="dark"] .qtr-badge.qtb-mid { color: #d4b563; }
.qtr-badge.qtb-low {
  background: var(--c-surface2);
  color: var(--c-muted);
  border: 1px solid var(--c-border);
}
.qtr-suggestion {
  font-family: var(--ff-serif-cn);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-text);
  margin: 0 0 22px;
  text-wrap: pretty;
}
.qtr-actions {
  display: flex; flex-direction: column; gap: 8px;
}
.qtr-cta-primary {
  padding: 13px 20px;
  background: var(--c-vermilion, var(--c-primary));
  color: white;
  border: none; border-radius: 10px;
  font-family: var(--ff-serif-cn);
  font-size: 14.5px; font-weight: 800;
  cursor: pointer;
  transition: filter .15s, transform .15s;
}
.qtr-cta-primary:hover { filter: brightness(1.06); transform: translateY(-1px); }
[data-theme="dark"] .qtr-cta-primary { color: var(--c-primary-fg, white); }
.qtr-cta-ghost {
  padding: 11px 20px;
  background: transparent;
  color: var(--c-muted);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  font-family: var(--ff-serif-cn);
  font-size: 13.5px; font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.qtr-cta-ghost:hover {
  border-color: var(--c-vermilion, var(--c-primary));
  color: var(--c-vermilion, var(--c-primary));
}

/* 編輯級 toast（取代 native alert）— 朱印紅左 hairline + 思源宋字 */
.editorial-toast {
  position: fixed;
  top: calc(var(--hdr-h, 56px) + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  z-index: 9997;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 16px 12px 14px;
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-left: 4px solid var(--c-vermilion, var(--c-primary));
  border-radius: 10px;
  box-shadow: 0 12px 32px -8px rgba(0,0,0,.18);
  font-family: var(--ff-serif-cn);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--c-ink, var(--c-text));
  max-width: min(440px, calc(100vw - 32px));
  opacity: 0;
  transition: opacity .25s, transform .35s cubic-bezier(.2, .9, .3, 1.1);
  pointer-events: auto;
}
.editorial-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.editorial-toast .et-icon {
  flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--c-vermilion);
  color: white;
  font-size: 13px;
  font-weight: 800;
  font-family: var(--ff-mono);
}
[data-theme="dark"] .editorial-toast .et-icon { color: var(--c-primary-fg, white); }
.editorial-toast .et-msg {
  flex: 1; min-width: 0;
  text-wrap: pretty;
}
.editorial-toast .et-close {
  flex-shrink: 0;
  background: transparent; border: none;
  color: var(--c-muted);
  cursor: pointer;
  font-size: 14px;
  width: 24px; height: 24px;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, color .15s;
}
.editorial-toast .et-close:hover {
  background: var(--c-surface2);
  color: var(--c-text);
}
/* type variants */
.editorial-toast.et-error {
  border-left-color: var(--c-danger, #dc2626);
}
.editorial-toast.et-error .et-icon {
  background: var(--c-danger, #dc2626);
}
.editorial-toast.et-success {
  border-left-color: var(--c-success, #059669);
}
.editorial-toast.et-success .et-icon {
  background: var(--c-success, #059669);
}
.editorial-toast.et-warn {
  border-left-color: #d4a847;
}
.editorial-toast.et-warn .et-icon {
  background: #d4a847;
}

/* TTS 編輯級提示 modal（取代系統 alert/confirm） */
.tts-modal-overlay {
  position: fixed; inset: 0; z-index: 9998;
  display: flex; align-items: center; justify-content: center;
  background: rgba(15, 15, 16, .65); backdrop-filter: blur(8px);
  padding: 20px;
  opacity: 0;
  transition: opacity .25s;
}
.tts-modal-overlay.show { opacity: 1; }
.tts-modal-card {
  background: var(--c-surface);
  border: 1.5px solid var(--c-rule, var(--c-border));
  border-left: 4px solid var(--c-vermilion, var(--c-primary));
  border-radius: 14px;
  padding: 26px 28px 24px;
  max-width: min(440px, 100%); width: 100%;
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, .35);
  font-family: var(--ff-serif-cn);
  transform: translateY(16px) scale(.96);
  transition: transform .35s cubic-bezier(.2, .9, .3, 1.1);
}
.tts-modal-overlay.show .tts-modal-card { transform: translateY(0) scale(1); }
.tts-modal-eyebrow {
  font-family: var(--ff-mono);
  font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-vermilion, var(--c-primary));
  margin-bottom: 12px;
}
.tts-modal-title {
  font-family: var(--ff-serif-cn);
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--c-ink, var(--c-text));
  margin: 0 0 14px;
  line-height: 1.3;
}
.tts-modal-body {
  font-family: var(--ff-serif-cn);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-text);
  margin-bottom: 20px;
  text-wrap: pretty;
}
.tts-modal-body p { margin: 0 0 10px; }
.tts-modal-body p:last-child { margin-bottom: 0; }
.tts-modal-body strong {
  color: var(--c-vermilion, var(--c-primary));
  font-weight: 800;
}
.tts-modal-body ol {
  padding-left: 22px;
  margin: 8px 0 0;
}
.tts-modal-body ol li {
  margin-bottom: 6px;
  font-size: 13.5px;
  line-height: 1.6;
}
.tts-modal-err {
  font-family: var(--ff-mono);
  font-size: 11.5px;
  color: var(--c-muted);
  background: var(--c-surface2);
  border-radius: 6px;
  padding: 8px 12px;
  margin: 6px 0 12px !important;
  word-break: break-all;
}
.tts-modal-actions {
  display: flex; flex-direction: column-reverse; gap: 8px;
  margin-top: 8px;
}
@media (min-width: 480px) {
  .tts-modal-actions { flex-direction: row; justify-content: flex-end; }
}
.tts-modal-cta {
  flex: 1; padding: 12px 20px;
  background: var(--c-vermilion, var(--c-primary)); color: white;
  border: none; border-radius: 10px;
  font-family: var(--ff-serif-cn);
  font-size: 14.5px; font-weight: 800;
  letter-spacing: .02em;
  cursor: pointer;
  transition: filter .15s, transform .15s;
}
.tts-modal-cta:hover { filter: brightness(1.06); transform: translateY(-1px); }
[data-theme="dark"] .tts-modal-cta { color: var(--c-primary-fg, white); }
.tts-modal-ghost {
  flex: 0 0 auto; padding: 11px 20px;
  background: transparent; color: var(--c-muted);
  border: 1px solid var(--c-border); border-radius: 10px;
  font-family: var(--ff-serif-cn);
  font-size: 13.5px; font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.tts-modal-ghost:hover {
  color: var(--c-vermilion);
  border-color: var(--c-vermilion);
}

/* ═══════════════════════════════════════════════════════════════
   2026-05-11 三專家 mesh：法規 sticky 工具列重設計
   A 群 nav (←/input/→) │ separator │ B 群 TTS (play / settings details)
   a11y：emoji aria-hidden、aria-pressed on play、cycle → named picker
   舊 .tts-play-all-chip / .tts-voice-chip / .tts-speed-chip 已退役
   ═══════════════════════════════════════════════════════════════ */

/* sr-only utility（live region 給 SR 廣播切換訊息） */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.law-toolbar {
  display: flex; align-items: center; gap: 8px;
  flex: 1; min-width: 0; flex-wrap: nowrap;
}

/* A 群：條號導航 */
.law-nav-group {
  display: flex; align-items: stretch; gap: 6px;
  flex-shrink: 0;
}
.law-nav-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; min-height: 32px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-family: var(--ff-serif-cn);
  font-size: .78rem; font-weight: 600;
  color: var(--c-ink, var(--c-text));
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
  white-space: nowrap;
}
.law-nav-btn:hover {
  border-color: var(--c-vermilion, var(--c-primary));
  color: var(--c-vermilion, var(--c-primary));
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 4%, var(--c-surface));
}
.law-nav-btn:focus-visible {
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: 2px;
}
.law-nav-ico { width: 14px; height: 14px; flex-shrink: 0; }

/* 第 N 條 input wrap — A 群 primary，朱印紅 focus 框 */
.law-jump-wrap {
  display: inline-flex; align-items: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 0 8px;
  min-height: 32px;
  transition: border-color .15s, box-shadow .15s;
  font-family: var(--ff-serif-cn);
}
.law-jump-wrap:focus-within {
  border-color: var(--c-vermilion, var(--c-primary));
  box-shadow: 0 0 0 2px rgba(178, 58, 43, .12);
}
.law-jump-prefix,
.law-jump-suffix {
  font-size: .78rem; font-weight: 600;
  color: var(--c-muted);
  line-height: 1;
  letter-spacing: -.01em;
}
.law-jump-inp {
  width: 44px;
  border: none; outline: none; background: transparent;
  font-family: var(--ff-mono);
  font-size: .9rem; font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: center;
  color: var(--c-vermilion, var(--c-primary));
  padding: 0 4px;
}
.law-jump-inp::placeholder { color: var(--c-muted); font-weight: 400; }
[data-theme="dark"] .law-jump-inp { color: currentColor; }

/* 跳轉按鈕 — 2026-05-13 v2: ghost 風格不撐高 wrap，跟 prefix/suffix 一體
   v1 朱紅 solid + align-self stretch 撐 32px 把後面 sibling 推出 bar，太突兀。
   v2: 純文字朱紅 + 無 border + 小尺寸，hover 才浮低彩 underline，與排版融為一體。 */
.law-jump-go {
  margin: 0 -2px 0 4px;
  padding: 2px 6px;
  background: transparent;
  color: var(--c-vermilion, var(--c-primary));
  border: none;
  border-radius: 4px;
  font-family: var(--ff-serif-cn);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  line-height: 1;
  transition: background .12s, color .12s;
  -webkit-tap-highlight-color: transparent;
}
.law-jump-go:hover {
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 8%, transparent);
}
.law-jump-go:active {
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 14%, transparent);
}
.law-jump-go:focus-visible {
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: 1px;
}

/* group separator — 細直線 editorial 美學 */
.law-toolbar-sep {
  display: inline-block;
  width: 1px; height: 20px;
  background: var(--c-border);
  flex-shrink: 0;
  align-self: center;
}

/* B 群：TTS 控制 */
.law-tts-group {
  display: flex; align-items: stretch; gap: 6px;
  flex-shrink: 0;
}

/* 朗讀全文 — 2026-05-12 方案 A：從 ink-black solid pill 改 ghost 6px radius，
   跟 .law-nav-btn 同 vocab；vermilion 只在播放中強調。box-shadow ring 砍掉，
   播放中改填色就夠 */
.law-tts-play {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 12px; min-height: 32px;
  background: var(--c-surface);
  color: var(--c-ink, var(--c-text));
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-family: var(--ff-serif-cn);
  font-size: .78rem; font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.law-tts-play:hover {
  border-color: var(--c-vermilion, var(--c-primary));
  color: var(--c-vermilion, var(--c-primary));
}
.law-tts-play:focus-visible {
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: 2px;
}
.law-tts-play.is-playing,
.law-tts-play[aria-pressed="true"] {
  background: var(--c-vermilion, var(--c-primary));
  border-color: var(--c-vermilion, var(--c-primary));
  color: white;
}
.law-tts-play-ico { width: 12px; height: 12px; flex-shrink: 0; }
.law-tts-play-ico-pause { display: none; }
.law-tts-play.is-playing .law-tts-play-ico-play { display: none; }
.law-tts-play.is-playing .law-tts-play-ico-pause { display: inline-block; }

/* 設定 — <details> inline 抽屜 */
.law-tts-settings { position: relative; }
/* 2026-05-12 方案 A：99px pill → 6px radius，跟 nav-btn / play-btn 同 vocab */
.law-tts-settings-trigger {
  list-style: none;
  display: inline-flex; align-items: center; gap: 5px;
  padding: 4px 10px; min-height: 32px;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-family: var(--ff-mono);
  font-size: .72rem; font-weight: 600;
  color: var(--c-muted);
  cursor: pointer;
  letter-spacing: .02em;
  transition: border-color .15s, color .15s, background .15s;
}
.law-tts-settings-trigger::-webkit-details-marker { display: none; }
.law-tts-settings-trigger::marker { display: none; }
.law-tts-settings-trigger:hover {
  border-color: var(--c-vermilion, var(--c-primary));
  color: var(--c-vermilion, var(--c-primary));
}
.law-tts-settings-trigger:focus-visible {
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: 2px;
}
.law-tts-settings-ico { width: 13px; height: 13px; flex-shrink: 0; opacity: .8; }
.law-tts-settings-name {
  display: inline-flex; align-items: baseline; gap: 2px;
  white-space: nowrap;
}
.law-tts-settings-name #tts-voice-label { font-family: var(--ff-serif-cn); font-weight: 700; }
.law-tts-settings-dot { opacity: .5; }
.law-tts-settings-caret {
  width: 11px; height: 11px;
  flex-shrink: 0;
  transition: transform .2s;
  opacity: .6;
}
.law-tts-settings[open] .law-tts-settings-caret { transform: rotate(180deg); }
.law-tts-settings[open] .law-tts-settings-trigger {
  border-color: var(--c-vermilion, var(--c-primary));
  color: var(--c-vermilion, var(--c-primary));
}

/* 設定面板 — absolute 浮層、push 內容若空間夠則自然 reflow */
.law-tts-panel {
  position: absolute;
  top: calc(100% + 6px); right: 0;
  z-index: 5;
  min-width: 280px; max-width: min(420px, calc(100vw - 32px));
  padding: 12px 14px;
  background: var(--c-paper-2, var(--c-surface));
  border: 1px solid var(--c-border);
  border-radius: 8px;
  box-shadow: 0 8px 24px -8px rgba(0, 0, 0, .18);
  display: flex; flex-direction: column; gap: 10px;
}
.law-tts-panel-row { display: flex; flex-direction: column; gap: 6px; }
.law-tts-panel-h {
  font-family: var(--ff-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.law-tts-pickers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 5px;
}
.law-tts-pickers-seg { grid-template-columns: repeat(5, 1fr); gap: 3px; }
.law-tts-pick {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 7px 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-family: var(--ff-serif-cn);
  font-size: .82rem;
  font-weight: 700;
  color: var(--c-ink, var(--c-text));
  cursor: pointer;
  /* v11：原本 transition: all .15s 在 .law-sticky-header 子樹內，class specificity
     蓋過 :where() reset。改白名單具體屬性，hover/active 視覺回饋保留但不波及
     iOS Safari compositor sampling。 */
  transition: background-color .15s, color .15s, border-color .15s, box-shadow .15s;
  text-align: center;
  min-height: 40px;
  justify-content: center;
}
.law-tts-pick:hover {
  border-color: var(--c-vermilion, var(--c-primary));
  background: color-mix(in oklch, var(--c-vermilion, #b23a2b) 5%, var(--c-surface));
}
.law-tts-pick:focus-visible {
  outline: 2px solid var(--c-vermilion, var(--c-primary));
  outline-offset: 1px;
}
.law-tts-pick.is-active,
.law-tts-pick[aria-pressed="true"] {
  background: var(--c-vermilion, var(--c-primary));
  border-color: var(--c-vermilion, var(--c-primary));
  color: white;
}
[data-theme="dark"] .law-tts-pick.is-active,
[data-theme="dark"] .law-tts-pick[aria-pressed="true"] { color: white; }
.law-tts-pick-main { font-size: .85rem; line-height: 1.2; }
.law-tts-pick-sub {
  font-size: .68rem;
  font-weight: 400;
  font-family: var(--ff-mono);
  letter-spacing: .02em;
  opacity: .75;
}
.law-tts-pick-seg {
  flex-direction: row;
  font-family: var(--ff-mono);
  font-size: .78rem;
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
}

.law-toolbar-result {
  font-size: .72rem;
  color: var(--c-danger);
  white-space: nowrap;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.law-toolbar-result:empty { display: none; }

/* ── 手機 ≤540：nav icon-only、touch 40×40、iOS 字級 ≥16 不 auto-zoom ── */
@media (max-width: 540px) {
  .law-toolbar { width: 100%; gap: 8px; justify-content: space-between; }
  .law-nav-group { gap: 4px; }
  .law-nav-btn {
    min-height: 40px; min-width: 40px;
    padding: 4px 8px;
    border-radius: 8px;
  }
  .law-nav-btn-label { display: none; }   /* 手機砍字、icon-only — aria-label 保留 */
  .law-nav-ico { width: 18px; height: 18px; }
  .law-jump-wrap { min-height: 40px; padding: 0 8px; border-radius: 8px; }
  .law-jump-prefix, .law-jump-suffix { font-size: .82rem; }
  .law-jump-inp { font-size: 16px; width: 40px; }
  /* 手機 button 進一步收窄避免擠出後面 next-btn / TTS group */
  .law-jump-go {
    margin: 0 -4px 0 2px;
    padding: 2px 5px;
    font-size: .72rem;
    letter-spacing: .02em;
  }
  .law-toolbar-sep { display: none; }
  /* 2026-05-12 方案 A：手機 4 zone 統一節奏
     ─ TTS play 跟 nav-btn 同尺寸 (40×40 icon-only)
     ─ 設定 ⚙ icon-only（名稱 + caret 隱藏，曉臻/1.0× 改 details 面板內看）
     ─ 全部 6px radius（jump-wrap 例外保 8px 配合 input 視覺） */
  .law-tts-group { gap: 4px; flex: 0 0 auto; }
  .law-tts-play {
    min-height: 40px; min-width: 40px;
    padding: 4px 10px;
    font-size: .82rem;
    gap: 4px;
  }
  .law-tts-play-ico { width: 18px; height: 18px; }
  .law-tts-play-label { display: none; }
  .law-tts-settings-trigger {
    min-height: 40px; min-width: 40px;
    padding: 4px 10px;
    gap: 0;
  }
  .law-tts-settings-ico { width: 18px; height: 18px; opacity: 1; }
  .law-tts-settings-name,
  .law-tts-settings-caret { display: none; }
  .law-tts-panel {
    right: -4px; left: auto;
    min-width: min(320px, calc(100vw - 24px));
  }
}

[data-theme="dark"] .law-tts-play {
  background: var(--c-paper, var(--c-text));
  color: var(--c-ink, var(--c-bg));
  border-color: var(--c-border);
}
[data-theme="dark"] .law-tts-play.is-playing { color: white; }
.toc-scroll-wrap { display: flex; align-items: center; flex: 1; min-width: 0; gap: 4px; }
/* 2026-05-12 方案 A：砍 ‹ › arrows — chips 原生 scroll + mask-image fade 邊緣
   就行，70% 短法規根本不需要捲動；保留 selector 但 display:none，回退方便 */
.toc-arrow { display: none; }
.toc-scroll {
  overflow-x: auto; -webkit-overflow-scrolling: touch; flex: 1; min-width: 0;
  /* iOS 攔截 swipe：pan-x 限只接水平，垂直 bubble 到 body */
  touch-action: pan-x;
  /* 邊緣 mask fade — 兩側 8% 淡出，視覺告知「還有更多」不靠 arrows */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
          mask-image: linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
}
.toc-scroll::-webkit-scrollbar { display: none; }
.toc-row { display: flex; gap: 6px; width: max-content; padding: 1px 0; }
.toc-link {
  display: flex; align-items: center; gap: 5px;
  padding: 4px 12px; border-radius: 20px;
  background: var(--c-surface); border: 1px solid var(--c-border);
  font-size: .78rem; font-weight: 600; white-space: nowrap; cursor: pointer;
  /* v11：transition: all → 白名單。.toc-link 在 .law-sticky-header 子樹內，
     class specificity 蓋過 :where() reset。 */
  transition: background-color .15s, color .15s, border-color .15s;
}
.toc-link:hover { border-color: var(--c-primary); color: var(--c-primary); }
.toc-link .cnt { font-size: .68rem; color: var(--c-muted); }

/* 2026-05-11：.toc-art-jump / .toc-art-inp / .toc-art-btn / #art-result inline
   樣式已退役，改 .law-toolbar / .law-jump-* / .law-toolbar-result（見 912 行附近） */

/* ═══════════════════════════════════
   LAW IN-PAGE SEARCH
═══════════════════════════════════ */
.law-search-bar {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 16px;
  background: var(--c-surface); border-bottom: 1px solid var(--c-border);
  /* 2026-05-07：搬進 .law-collapsible-bars 後不再需要自己 sticky
     parent .law-sticky-header 已 sticky 並負責 collapse；保留 sticky 會跟
     parent 的 max-height transition 打架（child 看自己 top，反而被 clip 截掉） */
  position: relative;
  z-index: 1;
}
.law-search-bar.hidden { display: none; }
.law-search-icon { width: 16px; height: 16px; color: var(--c-muted); flex-shrink: 0; }
.law-search-inp {
  flex: 1; padding: 5px 10px;
  background: var(--c-surface2); border: 1.5px solid var(--c-primary);
  border-radius: var(--r-sm);
  /* 16px to prevent iOS Safari auto-zoom on focus */
  font-size: 16px; color: var(--c-text);
}
.law-search-inp:focus { outline: none; }
.law-search-cnt { font-size: .72rem; color: var(--c-muted); white-space: nowrap; flex-shrink: 0; min-width: 36px; text-align: center; }
.law-search-nav-btn {
  width: 26px; height: 26px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-muted); border: 1px solid var(--c-border); flex-shrink: 0;
  /* v11：transition: all → 白名單。.law-search-nav-btn 在 .law-sticky-header
     子樹（搜尋列在 sticky 內），iOS Safari compositor 對 all 0.15s 仍 sample。 */
  transition: background-color .15s, color .15s, border-color .15s;
}
.law-search-nav-btn:hover:not(:disabled) { color: var(--c-primary); border-color: var(--c-primary); }
.law-search-nav-btn:disabled { opacity: .4; cursor: not-allowed; }
.law-search-nav-btn svg { width: 12px; height: 12px; }
.law-search-close {
  width: 26px; height: 26px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-muted); font-size: 1.1rem; line-height: 1; transition: color .15s;
}
.law-search-close:hover { color: var(--c-danger); }
mark.law-match { background: rgba(217,119,6,.25); border-radius: 2px; color: inherit; }
mark.law-match.current { background: rgba(217,119,6,.7); color: #fff; border-radius: 2px; }

/* ═══════════════════════════════════