/* ============================================================
   郡赫網頁軟體工作室 — 觀察筆記 NO.01
   風格：Editorial / 編輯雜誌
   字型：思源宋體（標題）+ 思源黑體（內文）+ EB Garamond（西文 / 數字）
   色彩：紙白 + 墨黑 + 赭紅
   ============================================================ */

:root {
  /* 基底 — 紙與墨 */
  --paper:        #f4efe6;   /* 略帶米色的紙白 */
  --paper-soft:   #ede6d9;
  --ink:          #1a1814;   /* 暖墨黑（不是純黑） */
  --ink-soft:     #44403c;
  --ink-muted:    #78716c;
  --rule:         #1a1814;

  /* 點綴 — 赭紅（印章感 / 排版紅線） */
  --crimson:      #8b1a1a;
  --crimson-deep: #6b1414;

  /* 反相（深底頁） */
  --ink-bg:       #15130f;
  --paper-on-ink: #f0e9da;

  /* 字型 */
  --font-serif:   "Noto Serif TC", "Source Han Serif TC", "Songti TC", "PMingLiU", serif;
  --font-sans:    "Noto Sans TC", "Source Han Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-display: "EB Garamond", "Cormorant Garamond", "Noto Serif TC", serif;
  --font-mono:    "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;
}

/* ============ 全域基底 ============ */

html, body { background: var(--paper); }

/* 全域 box-sizing：避免 padding 把 .page 撐出 section 邊界 */
.reveal *,
.reveal *::before,
.reveal *::after {
  box-sizing: border-box;
}

.reveal {
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0;
}

.reveal .slides { text-align: left; }

.reveal .slides section {
  height: 100%;
  padding: 0;
  overflow: hidden;
  background: var(--paper);
  /* 紙張紋理 */
  background-image:
    radial-gradient(rgba(26,24,20,0.025) 1px, transparent 1px),
    radial-gradient(rgba(26,24,20,0.018) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 1px;
}

.reveal .slides section::before {
  /* 細微的暗角，讓紙感更立體 */
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 50%, rgba(26,24,20,0.06));
  pointer-events: none;
  z-index: 1;
}

/* 文字基底 */
.reveal h1, .reveal h2, .reveal h3, .reveal h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0.02em;
  line-height: 1.25;
  margin: 0;
}

.reveal p {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  line-height: 1.85;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
  margin: 0;
}

.reveal strong {
  font-weight: 700;
  color: var(--ink);
  background: linear-gradient(180deg, transparent 60%, rgba(139,26,26,0.18) 60%);
}

.reveal em {
  font-style: normal;
  color: var(--crimson);
  font-family: var(--font-serif);
  font-weight: 600;
}

/* ============ 共用版面元件：眉、頁碼、頁腳 ============ */

.page {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 80px 100px;
  display: flex;
  flex-direction: column;
  z-index: 2;
}

/* 雜誌眉（每頁頂部標籤） */
.eyebrow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: var(--ink-muted);
  text-transform: uppercase;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 60px;
}

.eyebrow .eyebrow-left { display: flex; gap: 16px; align-items: center; }
.eyebrow .eyebrow-left::before {
  content: '';
  width: 18px;
  height: 1.5px;
  background: var(--crimson);
}

.eyebrow .eyebrow-right { letter-spacing: 0.2em; }

/* 頁腳 */
.folio {
  position: absolute;
  bottom: 36px;
  left: 100px;
  right: 100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--ink-muted);
  letter-spacing: 0.15em;
  z-index: 3;
}

.folio .folio-mark {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink);
}

.folio .folio-num {
  font-style: italic;
}

/* ============ 1. 封面 ============ */

.cover-slide .page {
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 70px 100px 60px;
}

.cover-masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 18px;
}

.cover-masthead .masthead-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.cover-masthead .masthead-meta {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--ink-soft);
  letter-spacing: 0.12em;
  text-align: right;
  line-height: 1.4;
}

.cover-masthead .masthead-meta strong {
  background: none;
  display: block;
  font-style: normal;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  color: var(--ink-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.cover-body {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 80px;
  padding: 40px 0;
}

.cover-body .cover-issue-num {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 1rem;
  color: var(--crimson);
  letter-spacing: 0.3em;
  margin-bottom: 24px;
}

.cover-slide h1 {
  font-size: 5.2rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  margin-bottom: 32px;
}

.cover-slide h1 .accent {
  color: var(--crimson);
  font-weight: 700;
}

.cover-slide .deck-line {
  width: 60px;
  height: 2px;
  background: var(--crimson);
  margin: 28px 0 24px;
}

.cover-slide .deck {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--ink-soft);
  line-height: 1.7;
  max-width: 540px;
}

.cover-body .cover-mark {
  text-align: center;
  align-self: center;
}

.cover-body .cover-mark img {
  width: 140px;
  height: auto;
  opacity: 0.92;
}

.cover-body .cover-mark .mark-label {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.82rem;
  color: var(--ink-muted);
  letter-spacing: 0.2em;
  margin-top: 8px;
}

.cover-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--ink);
  padding-top: 18px;
}

.cover-foot .author {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
  letter-spacing: 0.05em;
}

.cover-foot .author strong {
  background: none;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-right: 12px;
  letter-spacing: 0.08em;
}

.cover-foot .author-meta {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink-muted);
  letter-spacing: 0.1em;
}

/* ============ 2. 開場提問（編輯欄頁面） ============ */

.question-slide .page {
  padding: 80px 140px;
}

.question-slide .prologue-mark {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 8rem;
  line-height: 0.8;
  color: var(--crimson);
  margin-bottom: -20px;
  letter-spacing: -0.04em;
}

.question-slide .question-prompt {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 36px;
}

.question-slide h2 {
  font-size: 2.6rem;
  font-weight: 600;
  line-height: 1.5;
  max-width: 1000px;
  letter-spacing: 0.04em;
}

.question-slide h2 .pause {
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--ink);
  vertical-align: middle;
  margin: 0 8px;
}

.question-slide h2 .accent {
  color: var(--crimson);
  font-weight: 700;
}

.question-slide .question-block {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--ink);
}

.question-slide .keywords {
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--ink-muted);
  letter-spacing: 0.12em;
  margin-top: 28px;
}

.question-slide .keywords span {
  display: inline-block;
  margin-right: 6px;
}

.question-slide .keywords .sep {
  color: var(--crimson);
  margin: 0 14px;
}

/* ============ 3 & 8. 大字引言（深底） ============ */

.quote-slide {
  background: var(--ink-bg) !important;
  background-image: none !important;
}

.quote-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(240,233,218,0.04) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
}

.quote-slide .page {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 80px 120px;
}

.quote-slide .quote-mark-large {
  font-family: var(--font-display);
  font-size: 14rem;
  line-height: 0.6;
  color: var(--crimson);
  font-style: italic;
  margin-bottom: -10px;
  margin-left: -20px;
}

.quote-slide .quote-text {
  font-family: var(--font-serif);
  font-size: 4rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper-on-ink);
  max-width: 1100px;
  letter-spacing: 0.03em;
}

.quote-slide .quote-text .accent {
  color: #d4a574;          /* 暖金色，深底襯托 */
  font-weight: 700;
}

.quote-slide .quote-text .stress {
  display: inline-block;
  border-bottom: 3px solid var(--crimson);
  padding-bottom: 4px;
}

.quote-slide .quote-attr {
  margin-top: 50px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: rgba(240,233,218,0.55);
  letter-spacing: 0.25em;
}

.quote-slide .quote-attr::before {
  content: '— ';
}

/* ============ 4 & 6 & 9. 雙欄（規線分隔） ============ */

.column-slide h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.column-slide .deck {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin-bottom: 50px;
  max-width: 800px;
}

.dual-grid {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 50px;
  flex: 1;
  align-items: start;
}

.dual-grid .divider {
  background: var(--ink);
  width: 1px;
  height: 100%;
  min-height: 320px;
}

.dual-grid .col {
  padding: 0;
}

.dual-grid .col-num {
  font-family: var(--font-display);
  font-size: 1rem;
  font-style: italic;
  color: var(--crimson);
  letter-spacing: 0.3em;
  margin-bottom: 14px;
}

.dual-grid .col-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 6px;
}

.dual-grid .col h3 {
  font-family: var(--font-serif);
  font-size: 1.95rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}

.dual-grid .col p {
  font-size: 1.1rem;
  line-height: 1.95;
  color: var(--ink-soft);
}

/* 雙欄裡的範例截圖（Slide 9 對外/對內） */
.dual-grid .col .col-image {
  margin: 14px 0 18px;
  border: 1px solid var(--ink);
  background: white;
  padding: 6px;
  height: 200px;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  position: relative;
}

.dual-grid .col .col-image::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 10px;
  height: 10px;
  background: var(--crimson);
}

.dual-grid .col .col-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.dual-grid .col h3 .col-h3-tail {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  margin-left: 12px;
}

.dual-grid .col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.dual-grid .col ul li {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  line-height: 2;
  color: var(--ink-soft);
  padding-left: 24px;
  position: relative;
}

.dual-grid .col ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--crimson);
  font-weight: 600;
}

.column-slide .stinger {
  margin-top: 50px;
  padding-top: 26px;
  border-top: 1px solid var(--ink);
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--ink);
  text-align: center;
}

.column-slide .stinger .accent {
  color: var(--crimson);
  font-weight: 700;
}

/* ============ 5 & 10. 章節標題 ============ */

.chapter-slide .page {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 100px;
}

.chapter-slide .chapter-graphic {
  text-align: center;
  border-right: 1px solid var(--ink);
  padding-right: 80px;
  height: 70%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.chapter-slide .chapter-roman {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 16rem;
  line-height: 0.85;
  color: var(--ink);
  letter-spacing: -0.04em;
}

.chapter-slide .chapter-cn-num {
  font-family: var(--font-serif);
  font-size: 14rem;
  line-height: 0.95;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.chapter-slide .chapter-cn-num .red {
  color: var(--crimson);
}

.chapter-slide .chapter-mark {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--crimson);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--crimson);
  width: 70%;
}

.chapter-slide .chapter-text .chapter-tag {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.4em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--crimson);
  margin-bottom: 20px;
}

.chapter-slide h2 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}

.chapter-slide .chapter-deck {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ============ 7. 案例對比（圖文編輯） ============ */

.compare-slide .page {
  padding: 60px 90px 90px;
}

.compare-slide h2 {
  font-size: 2.4rem;
  margin-bottom: 8px;
}

.compare-slide .deck {
  font-family: var(--font-serif);
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin-bottom: 36px;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin-top: 0;
}

.compare-card {
  display: flex;
  flex-direction: column;
}

.compare-card .case-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 2px solid var(--ink);
  padding-top: 12px;
  margin-bottom: 18px;
}

.compare-card .case-eyebrow .case-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--crimson);
}

.compare-card .case-eyebrow .case-tag {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.compare-card .case-eyebrow .case-tag.before-tag { color: var(--ink-muted); }
.compare-card .case-eyebrow .case-tag.after-tag  { color: var(--crimson); }

.compare-card h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

.compare-card .case-image {
  background: white;
  padding: 8px;
  border: 1px solid var(--ink);
  margin-bottom: 10px;
  position: relative;
  height: 220px;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.compare-card .case-image::before {
  /* 圖片角落的小方塊裝飾 */
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 12px;
  height: 12px;
  background: var(--crimson);
}

.compare-card .case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.compare-card .caption {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.65;
  padding-top: 10px;
  border-top: 1px solid var(--ink-muted);
}

.compare-card ul {
  list-style: none;
  padding: 0;
  margin: 14px 0 0 0;
}

.compare-card ul li {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink);
  padding-left: 22px;
  position: relative;
}

.compare-card.before ul li::before {
  content: '−';
  position: absolute;
  left: 0;
  color: var(--ink-muted);
  font-weight: 700;
}

.compare-card.after ul li::before {
  content: '＋';
  position: absolute;
  left: 0;
  color: var(--crimson);
  font-weight: 700;
}

/* ============ 11/12/13. 三訊號詳細 ============ */

.signal-slide .page {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: center;
  gap: 80px;
  padding: 80px 110px;
}

.signal-graphic {
  border-right: 1px solid var(--ink);
  padding: 40px 60px 40px 0;
  height: 75%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  position: relative;
}

.signal-graphic .signal-tag {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--crimson);
  margin-bottom: 30px;
}

.signal-graphic .signal-cn {
  font-family: var(--font-serif);
  font-size: 13rem;
  font-weight: 700;
  line-height: 0.95;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.signal-graphic .signal-cn.red { color: var(--crimson); }

.signal-graphic .signal-roman {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--ink-muted);
  letter-spacing: 0.4em;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--ink);
  width: 100%;
}

.signal-content h2 {
  font-family: var(--font-serif);
  font-size: 3.6rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 30px;
  letter-spacing: 0.04em;
}

.signal-content .signal-body {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  line-height: 2;
  color: var(--ink-soft);
}

.signal-content .signal-body .quote-line {
  font-family: var(--font-serif);
  color: var(--ink);
  font-size: 1.4rem;
  display: block;
  padding: 6px 0 6px 20px;
  border-left: 2px solid var(--crimson);
  margin: 8px 0;
  font-weight: 500;
}

.signal-content .signal-body em {
  font-family: var(--font-serif);
  color: var(--crimson);
  font-weight: 700;
}

.signal-content .signal-body .stamp {
  display: inline-block;
  font-family: var(--font-serif);
  color: var(--crimson);
  font-weight: 700;
}

/* ============ 14. 跨產業（目錄式） ============ */

.industry-slide h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.industry-slide .deck {
  font-family: var(--font-serif);
  color: var(--ink-soft);
  font-size: 1.1rem;
  margin-bottom: 50px;
}

.industry-list {
  border-top: 2px solid var(--ink);
}

.industry-list .industry-row {
  display: grid;
  grid-template-columns: 56px 60px 240px 1fr;
  gap: 28px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--ink);
}

.industry-list .industry-row .row-icon { grid-column: 1; }
.industry-list .industry-row .row-num  { grid-column: 2; }
.industry-list .industry-row .row-name { grid-column: 3; }
.industry-list .industry-row .row-desc { grid-column: 4; }

.industry-list .industry-row .row-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.industry-list .industry-row .row-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.industry-list .industry-row .row-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 2rem;
  color: var(--crimson);
  letter-spacing: 0.04em;
}

.industry-list .industry-row .row-name {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.industry-list .industry-row .row-desc {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.industry-list .industry-row .row-desc em {
  font-family: var(--font-serif);
  color: var(--crimson);
  font-weight: 700;
}

.industry-slide .stinger {
  margin-top: 40px;
  text-align: center;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.6;
}

.industry-slide .stinger strong {
  background: linear-gradient(180deg, transparent 60%, rgba(139,26,26,0.25) 60%);
  font-weight: 700;
}

/* ============ 15. 收尾 / 簽名頁（深底） ============ */

.cta-slide {
  background: var(--ink-bg) !important;
  background-image: none !important;
}

.cta-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(240,233,218,0.03) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
}

.cta-slide .page {
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 70px 100px 60px;
  color: var(--paper-on-ink);
}

.cta-slide .cta-eyebrow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: rgba(240,233,218,0.55);
  text-transform: uppercase;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(240,233,218,0.3);
}

.cta-slide .cta-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 30px 0;
}

.cta-slide h2 {
  font-family: var(--font-serif);
  font-size: 4.2rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--paper-on-ink);
  margin-bottom: 30px;
  letter-spacing: 0.04em;
  max-width: 1000px;
}

.cta-slide h2 .accent {
  color: #d4a574;
  font-weight: 700;
}

.cta-slide .cta-text {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: rgba(240,233,218,0.85);
  max-width: 760px;
  line-height: 1.85;
  margin-bottom: 50px;
}

.cta-slide .cta-rule {
  width: 80px;
  height: 2px;
  background: var(--crimson);
  margin: 24px 0;
}

.cta-slide .cta-final {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--paper-on-ink);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.cta-slide .cta-final .red { color: #d4a574; font-weight: 700; }

.cta-slide .signature-block {
  border-top: 1px solid rgba(240,233,218,0.3);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cta-slide .signature {
  display: flex;
  align-items: center;
  gap: 18px;
}

.cta-slide .signature img {
  height: 60px;
  filter: invert(1) brightness(1.1);
  opacity: 0.85;
}

.cta-slide .signature .signature-text {
  font-family: var(--font-serif);
  text-align: left;
}

.cta-slide .signature .signature-text strong {
  background: none;
  font-size: 1.15rem;
  color: var(--paper-on-ink);
  display: block;
  letter-spacing: 0.06em;
  font-weight: 600;
}

.cta-slide .signature .signature-text span {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: rgba(240,233,218,0.55);
  letter-spacing: 0.18em;
}

.cta-slide .end-mark {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: rgba(240,233,218,0.55);
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

/* ============ 進度條 / 控制 ============ */

.reveal .progress {
  color: var(--crimson);
  height: 3px;
  background: rgba(26,24,20,0.08);
}

.reveal .controls {
  color: var(--ink-muted);
}

/* 隱藏 reveal 預設的頁碼（我們有自己的 folio） */
.reveal .slide-number {
  display: none;
}

/* ============ Fragment 進場動畫（淡入＋微移） ============ */

.reveal .slides section .fragment {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal .slides section .fragment.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 整頁進場：第一頁元素自動 stagger */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reveal .slides section.present .page > * {
  animation: fadeUp 0.7s ease both;
}

.reveal .slides section.present .page > *:nth-child(1) { animation-delay: 0.05s; }
.reveal .slides section.present .page > *:nth-child(2) { animation-delay: 0.18s; }
.reveal .slides section.present .page > *:nth-child(3) { animation-delay: 0.32s; }
.reveal .slides section.present .page > *:nth-child(4) { animation-delay: 0.48s; }

/* ============================================================
   圖片整合區（給 Codex 產出後的 placeholder）
   未產出前 img 會抓不到檔案，靠 onerror 自動隱藏
   ============================================================ */

/* 通用：placeholder 容器 — 圖片載入失敗自動隱藏 */
.illus {
  position: absolute;
  pointer-events: none;
  z-index: 2;
  opacity: 0;                       /* 預設隱藏，圖載入後 fade in */
  transition: opacity 0.8s ease;
}
.illus.loaded { opacity: 1; }
.illus img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;          /* 跟紙紋融合，避免硬白邊 */
}

/* — 訊號 01/02/03 右上角 spot illustration — */
.signal-slide .illus.signal-spot {
  top: 60px;
  right: 90px;
  width: 220px;
  height: 220px;
  opacity: 0;                        /* 蓋寫上面，先隱藏 */
}
.signal-slide .illus.signal-spot.loaded { opacity: 0.92; }

/* — 案例章節頁背景插圖 — */
.chapter-slide .illus.chapter-illus {
  bottom: 0;
  right: 0;
  width: 50%;
  height: 92%;
}
.chapter-slide .illus.chapter-illus.loaded { opacity: 0.16; }
.chapter-slide .illus.chapter-illus img { object-fit: cover; object-position: right bottom; }

/* — 封面右上角紋飾 — */
.cover-slide .illus.cover-ornament {
  top: 130px;
  right: 90px;
  width: 90px;
  height: 90px;
}
.cover-slide .illus.cover-ornament.loaded { opacity: 0.7; }

/* 深底頁的圖（如果未來要放）反相處理 */
.quote-slide .illus img,
.cta-slide .illus img {
  filter: invert(1) brightness(1.1);
  mix-blend-mode: screen;
}

/* ============================================================
   啟動簡報 / 講者視窗 控制面板（右上角）
   進入全螢幕、overview、講者預覽 時自動隱藏
   ============================================================ */
.presenter-controls {
  position: fixed;
  top: 28px;
  right: 28px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  font-family: var(--font-sans);
  pointer-events: auto;
}

.presenter-controls .ctl-eyebrow {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.7rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--ink-muted);
  padding-right: 4px;
  margin-bottom: -2px;
}

.presenter-controls .ctl-eyebrow::before {
  content: '— ';
  color: var(--crimson);
}

.presenter-controls button {
  font-family: var(--font-serif);
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  letter-spacing: 0.1em;
  border-radius: 0;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}

.presenter-controls .btn-primary {
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 22px;
  background: var(--ink);
  color: var(--paper-on-ink);
  border-color: var(--ink);
  box-shadow: 4px 4px 0 var(--crimson);
}

.presenter-controls .btn-primary:hover {
  background: var(--crimson);
  border-color: var(--crimson);
  box-shadow: 4px 4px 0 var(--ink);
}

.presenter-controls .btn-primary .btn-icon {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  color: #d4a574;
  font-size: 1.15rem;
  line-height: 1;
}

.presenter-controls .btn-primary:hover .btn-icon {
  color: var(--paper-on-ink);
}

.presenter-controls .btn-secondary {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 7px 14px;
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--ink-muted);
}

.presenter-controls .btn-secondary:hover {
  background: var(--ink);
  color: var(--paper-on-ink);
  border-color: var(--ink);
}

.presenter-controls .ctl-hint {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.06em;
  margin-top: 6px;
}

.presenter-controls .ctl-mode-switch {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--ink-muted);
  text-decoration: none;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-bottom: 1px solid var(--ink-muted);
  transition: color 0.18s, border-color 0.18s;
  margin-top: 4px;
}

.presenter-controls .ctl-mode-switch:hover {
  color: var(--crimson);
  border-color: var(--crimson);
}

.presenter-controls .ctl-hint kbd {
  font-family: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;
  background: var(--ink);
  color: var(--paper-on-ink);
  padding: 2px 6px;
  font-size: 0.65rem;
  font-style: normal;
  margin: 0 2px;
  border-radius: 0;
  letter-spacing: 0;
}

/* — 隱藏條件 — */
:fullscreen .presenter-controls,
:-webkit-full-screen .presenter-controls,
.presenter-controls.is-hidden {
  display: none !important;
}

/* Reveal overview 模式 / print 模式也隱藏 */
.reveal.overview ~ .presenter-controls,
.print-pdf .presenter-controls {
  display: none !important;
}

@media print {
  .presenter-controls { display: none !important; }
}

/* ============================================================
   列印 / PDF 匯出（?print-pdf 模式）
   ============================================================ */
@media print {
  .reveal .controls,
  .reveal .progress,
  .reveal .slide-number { display: none !important; }

  .reveal .slides section {
    page-break-after: always;
    background: var(--paper) !important;
  }

  /* 列印時取消所有動畫 */
  .reveal .slides section.present .page > *,
  .reveal .slides section .fragment {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  /* multiply 在印刷上會變糊，列印時用 normal */
  .illus img { mix-blend-mode: normal !important; }
}

/* ============ 響應式 ============ */

@media (max-width: 1100px) {
  .page { padding: 50px 60px; }
  .reveal h1 { font-size: 3.4rem; }
  .quote-slide .quote-text { font-size: 2.6rem; }
  .signal-graphic .signal-cn { font-size: 10rem; }
  .chapter-slide .chapter-cn-num { font-size: 12rem; }
  .chapter-slide .chapter-roman { font-size: 10rem; }
  .signal-slide .page,
  .chapter-slide .page { grid-template-columns: 1fr; }
  .signal-graphic, .chapter-slide .chapter-graphic {
    border-right: none;
    border-bottom: 1px solid var(--ink);
    padding: 30px 0;
  }
  .compare-grid, .dual-grid { grid-template-columns: 1fr; gap: 40px; }
  .dual-grid .divider { display: none; }
  .industry-list .industry-row { grid-template-columns: 60px 1fr; gap: 20px; }
  .industry-list .industry-row .row-desc { grid-column: 2; }
}