/* ============================================================
   線上節目手冊（/productions/{slug}/programme/）
   - 獨立 reading mode；不顯示主站 header/footer
   - 兩種主題：淺色（暖米底 #f1ebdd）/ 深色，data-theme 切換
   - 字級可調（A-/A+），CSS var --pb-scale
   - 全部 prefers-reduced-motion 退場
   ============================================================ */

/* ===== Tokens ===== */
.programme-booklet {
  --pb-paper:        #f1ebdd;
  --pb-paper-2:      #e8e0cf;
  --pb-paper-3:      #ddd2bd;
  --pb-ink:          #2a2520;
  --pb-ink-soft:     #4a423a;
  --pb-muted:        rgba(42, 37, 32, .58);
  --pb-muted-2:      rgba(42, 37, 32, .78);
  --pb-rule:         rgba(42, 37, 32, .14);
  --pb-rule-strong:  rgba(42, 37, 32, .32);
  --pb-accent:       #8e2415;
  --pb-shadow:       0 12px 32px rgba(42, 37, 32, .10);
  --pb-scale:        1;
  --pb-content-max:  720px;
  --pb-trans:        240ms cubic-bezier(.4, 0, .2, 1);
}
.programme-booklet[data-theme="dark"] {
  --pb-paper:        #0d0b08;
  --pb-paper-2:      #1a1612;
  --pb-paper-3:      #25201a;
  --pb-ink:          #f1ebdd;
  --pb-ink-soft:     #c8c0b0;
  --pb-muted:        rgba(241, 235, 221, .50);
  --pb-muted-2:      rgba(241, 235, 221, .72);
  --pb-rule:         rgba(241, 235, 221, .12);
  --pb-rule-strong:  rgba(241, 235, 221, .30);
  --pb-accent:       #d4a574;
  --pb-shadow:       0 12px 32px rgba(0, 0, 0, .4);
}

/* ===== Reset main chrome on booklet pages ===== */
body.programme-booklet {
  margin: 0;
  background: var(--pb-paper);
  color: var(--pb-ink);
  font-family: var(--font-emphasis, "GenYoMin TW", "Noto Serif TC", serif);
  font-size: calc(17px * var(--pb-scale));
  line-height: 1.75;
  letter-spacing: .01em;
  transition: background var(--pb-trans), color var(--pb-trans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body.programme-booklet .site-header,
body.programme-booklet .site-footer,
body.programme-booklet .site-announce,
body.programme-booklet .drawer { display: none !important; }
body.programme-booklet main { all: unset; display: block; }

/* ===== Layout shell ===== */
.pb-shell {
  min-height: 100vh;
  padding: 0 24px;
  position: relative;
}
.pb-content {
  max-width: var(--pb-content-max);
  margin: 0 auto;
  padding-bottom: 120px;
}

/* ===== Back link (top of content) ===== */
.pb-back {
  display: inline-block;
  margin: 32px 0 0;
  font-family: var(--font-mono);
  font-size: calc(12px * var(--pb-scale));
  letter-spacing: .12em;
  color: var(--pb-muted-2);
  text-decoration: none;
  transition: color var(--pb-trans);
}
.pb-back:hover { color: var(--pb-ink); }

/* ===== Cover（極簡：eyebrow + 標題 + 英文標題；日期/場館/指揮/導言留在製作頁）===== */
.pb-cover {
  padding: 56px 0 36px;
  text-align: center;
  border-bottom: 1px solid var(--pb-rule);
}
.pb-cover__eyebrow {
  font-family: var(--font-mono);
  font-size: calc(11px * var(--pb-scale));
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--pb-muted);
  margin-bottom: 18px;
}
.pb-cover__title {
  font-family: var(--font-emphasis, "GenYoMin TW", "Noto Serif TC", serif);
  font-size: calc(clamp(36px, 6vw, 56px) * var(--pb-scale));
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -.01em;
  margin: 0 0 10px;
  text-wrap: balance;
}
.pb-cover__en {
  font-family: var(--font-serif-en, "Fraunces", serif);
  font-style: italic;
  font-weight: 400;
  font-size: calc(clamp(18px, 2.4vw, 22px) * var(--pb-scale));
  color: var(--pb-muted-2);
  letter-spacing: .02em;
  margin: 0;
}

/* ===== Section ===== */
.pb-section { padding: 44px 0 24px; }
.pb-section__head {
  text-align: center;
  margin-bottom: 36px;
}
.pb-section__zh {
  font-family: var(--font-emphasis);
  font-size: calc(clamp(22px, 2.6vw, 28px) * var(--pb-scale));
  font-weight: 500;
  letter-spacing: .04em;
  margin: 0 0 6px;
}
.pb-section__en {
  font-family: var(--font-mono);
  font-size: calc(11px * var(--pb-scale));
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--pb-muted);
}

/* ===== Piece ===== */
.pb-piece { border-top: 1px solid var(--pb-rule); }
.pb-piece:last-child { border-bottom: 1px solid var(--pb-rule); }
.pb-piece details > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 36px 1fr 24px;
  align-items: baseline;
  gap: 16px;
  padding: 28px 4px;
  transition: background var(--pb-trans);
}
.pb-piece details > summary::-webkit-details-marker { display: none; }
.pb-piece details > summary:hover {
  background: color-mix(in oklab, var(--pb-paper-2) 50%, transparent);
}
.pb-piece-num {
  font-family: var(--font-mono);
  font-size: calc(13px * var(--pb-scale));
  color: var(--pb-muted);
  letter-spacing: .08em;
}
.pb-piece-titleblock { min-width: 0; }
.pb-piece-title {
  font-family: var(--font-emphasis);
  font-size: calc(20px * var(--pb-scale));
  font-weight: 500;
  line-height: 1.35;
  display: inline;
}
.pb-piece-zh {
  color: var(--pb-muted-2);
  font-weight: 400;
  margin-left: .3em;
}
.pb-piece-composer {
  display: block;
  font-family: var(--font-mono);
  font-size: calc(12px * var(--pb-scale));
  color: var(--pb-muted);
  letter-spacing: .03em;
  margin-top: 8px;
  line-height: 1.5;
}
.pb-piece-arr {
  font-family: var(--font-mono);
  font-size: calc(20px * var(--pb-scale));
  color: var(--pb-muted);
  align-self: center;
  transition: transform var(--pb-trans), color var(--pb-trans);
}
.pb-piece details[open] .pb-piece-arr {
  transform: rotate(90deg);
  color: var(--pb-accent);
}
.pb-piece-body {
  padding: 8px 4px 36px;
  animation: pb-piece-expand 360ms cubic-bezier(.4, 0, .2, 1);
}
@keyframes pb-piece-expand {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}
.pb-piece-notes {
  font-size: calc(15.5px * var(--pb-scale));
  line-height: 1.85;
  color: var(--pb-ink-soft);
  margin-bottom: 32px;
  /* 左對齊（端傳媒/報導者/Matters 中文嚴肅長文業界標準）
     ──「靠左齊行」是 InDesign 印刷理想，但 mobile Safari 對純 CJK 行的
     text-justify 處理會強制撐字距，純 CSS 無解，故採業界共識方案
     ──「hanging-punctuation 給 justify 用」，左對齊時開了反而讓右邊更亂 */
  text-align: left;
  line-break: strict;                 /* 行末/行首禁則：「（」不行尾、「）。」不行首 */
  overflow-wrap: break-word;          /* 英文長詞溢出才斷（比 anywhere 保守）*/
  /* ⚠ 不用 text-wrap: pretty — WebKit 對長 CJK 正文會「刻意提前斷行」改善 rag，
     但 CJK 無 word boundary，演算法用整行縮短硬做 → 右側大量留白卻斷行。
     詳 memory reference-cjk-typography。長 CJK 正文一律用預設 text-wrap: auto */
}
.pb-piece-notes p { margin: 0 0 1em; }
.pb-piece-notes p:last-child { margin-bottom: 0; }
.pb-piece-lyrics {
  padding: 28px 28px;
  background: var(--pb-paper-2);
  border-left: 2px solid var(--pb-accent);
  font-size: calc(15px * var(--pb-scale));
  line-height: 1.9;
  letter-spacing: .02em;
  /* 歌詞左對齊（詩歌斷行語意保留；同 notes 不開 hanging-punctuation）*/
  text-align: left;
  line-break: strict;
  overflow-wrap: break-word;
}
.pb-piece-lyrics p { margin: 0 0 1em; }
.pb-piece-lyrics p:last-child { margin-bottom: 0; }

/* ===== Intermission divider ===== */
.pb-intermission {
  text-align: center;
  margin: 64px 0;
  font-family: var(--font-mono);
  font-size: calc(11px * var(--pb-scale));
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--pb-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.pb-intermission::before,
.pb-intermission::after {
  content: "";
  flex: 0 0 80px;
  height: 1px;
  background: var(--pb-rule-strong);
}

/* ============================================================
   UI: 右下角浮動工具列（目錄 + 主題 + 字級）
   ＋ TOC 抽屜
   ============================================================ */

/* TOC drawer */
.pb-toc {
  position: fixed; top: 0; left: 0;
  width: min(360px, 90vw); height: 100vh;
  background: var(--pb-paper-2);
  border-right: 1px solid var(--pb-rule);
  box-shadow: var(--pb-shadow);
  transform: translateX(-100%);
  transition: transform var(--pb-trans);
  z-index: 80;
  overflow-y: auto;
  padding: 24px 24px 40px;
}
.pb-toc.is-open { transform: translateX(0); }
.pb-toc__close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px;
  border: 1px solid var(--pb-rule);
  background: transparent;
  border-radius: 50%;
  font-size: 20px; cursor: pointer;
  color: var(--pb-ink);
}
.pb-toc__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--pb-muted);
  margin: 24px 0 16px;
}
.pb-toc__list { list-style: none; margin: 0; padding: 0; }
.pb-toc__list li { padding: 0; }
.pb-toc__list a {
  display: block;
  padding: 12px 0;
  font-family: var(--font-emphasis);
  font-size: 15px;
  line-height: 1.4;
  color: var(--pb-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--pb-rule);
  transition: color var(--pb-trans), padding-left var(--pb-trans);
}
.pb-toc__list a:hover { color: var(--pb-accent); padding-left: 6px; }
.pb-toc__sec {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--pb-muted);
  margin: 18px 0 4px;
}
.pb-toc__num {
  display: inline-block;
  width: 24px;
  font-family: var(--font-mono);
  color: var(--pb-muted);
  font-size: 12px;
}

/* TOC backdrop */
.pb-toc-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, .4);
  opacity: 0; visibility: hidden;
  transition: opacity var(--pb-trans), visibility var(--pb-trans);
  z-index: 70;
}
.pb-toc-backdrop.is-on { opacity: 1; visibility: visible; }

/* 右下角浮動工具列：pill 形狀、所有 UI 集中此處（不會擋到頂部「返回」連結）
   按鈕 48×48 對齊 iOS HIG / Material 觸控目標；桌機手機同尺寸 */
.pb-toolbar {
  position: fixed; bottom: 24px; right: 24px; z-index: 60;
  display: flex; align-items: center; gap: 6px;
  background: color-mix(in oklab, var(--pb-paper-2) 92%, transparent);
  border: 1px solid var(--pb-rule);
  border-radius: 999px;
  padding: 6px;
  box-shadow: var(--pb-shadow);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
}
.pb-toolbar__btn {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 50%;
  background: transparent;
  color: var(--pb-ink);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .04em;
  line-height: 1;
  transition: background var(--pb-trans), color var(--pb-trans);
}
.pb-toolbar__btn:hover { background: var(--pb-paper-3); color: var(--pb-accent); }
.pb-toolbar__btn[aria-pressed="true"] { background: var(--pb-ink); color: var(--pb-paper); }
.pb-toolbar__btn svg { width: 22px; height: 22px; stroke: currentColor; }
.pb-toolbar__sep {
  width: 1px; height: 24px;
  background: var(--pb-rule-strong);
  opacity: .6;
  flex-shrink: 0;
}

/* Mobile：toolbar 按鈕不縮小（觸控優先），只調 bottom/right 內縮 */
@media (max-width: 600px) {
  .pb-shell { padding: 0 16px; }
  .pb-toolbar { bottom: 16px; right: 16px; }
  /* btn 維持 48×48；只縮 bottom 邊距，避免擋到頁面太多空間 */
  .pb-cover { padding: 40px 0 28px; }
  .pb-section { padding: 32px 0 16px; }
  .pb-section__head { margin-bottom: 28px; }
  .pb-piece details > summary { padding: 22px 0; grid-template-columns: 28px 1fr 20px; gap: 12px; }
  .pb-piece-lyrics { padding: 22px 18px; }
}

/* ===== prefers-reduced-motion ===== */
@media (prefers-reduced-motion: reduce) {
  body.programme-booklet,
  .pb-toc, .pb-toc-backdrop, .pb-toolbar, .pb-toolbar__btn,
  .pb-piece details > summary, .pb-piece-arr,
  .pb-back {
    transition: none !important;
  }
  .pb-piece-body { animation: none; }
}

/* ===== Print friendly ===== */
@media print {
  .pb-toolbar, .pb-back, .pb-toc, .pb-toc-backdrop { display: none !important; }
  body.programme-booklet { background: #fff; color: #000; }
  .pb-piece details { display: block; }
  .pb-piece details > summary { list-style: none; cursor: default; }
  .pb-piece-body { display: block !important; }
}