/* ===========================================================
 * shared/theme.css
 * Anthropic-inspired design system for the Lecture Series
 *
 * 設計原則:
 *  - 白基調ではなくクリーム（暖色オフホワイト）
 *  - テラコッタを唯一のアクセント、量は最小
 *  - Serif（Source Serif 4 / Noto Serif JP）が見出しの主役
 *  - 余白は贅沢に。1 スライド 1 メッセージ
 *  - 装飾的な枠線・影は使わない
 * =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;0,8..60,600;1,8..60,400&family=Inter:wght@400;500;600;700&family=Noto+Serif+JP:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* ── Surfaces ─────────────────────────────────────── */
  --cream:        #f0eee5;   /* Anthropic 風の暖かいオフホワイト */
  --cream-soft:   #f7f5ed;
  --paper:        #ffffff;

  /* ── Ink ─────────────────────────────────────────── */
  --ink:          #1f1f1f;
  --ink-2:        #3d3d3d;
  --ink-mute:     #6c6c6c;
  --ink-light:    #a39f93;

  /* ── Accent (terracotta / clay) ──────────────────── */
  --clay:         #cc785c;
  --clay-deep:    #a85a3f;
  --clay-soft:    #f3e3dc;
  --clay-haze:    #faf2ee;

  /* ── Lines ───────────────────────────────────────── */
  --rule:         #e6e0d2;
  --border:       #d6d0c0;

  /* ── Typography ──────────────────────────────────── */
  --font-serif:   "Source Serif 4", "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --font-sans:    "Inter", "Noto Sans JP", -apple-system, "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-mono:    "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}

/* ===== Page ===== */
html, body {
  margin: 0;
  padding: 0;
  background: var(--cream);
}

/* ===== deck-stage host ===== */
deck-stage {
  font-family: var(--font-sans);
  color: var(--ink);
  font-feature-settings: "palt" 1;  /* 日本語の自動カーニング */
}

deck-stage > section {
  background: var(--cream);
  color: var(--ink);
  overflow: hidden;
  box-sizing: border-box;
  position: relative;
}

/* ============================================================
 * Meta line (top-left: series, top-right: chapter & page)
 * ============================================================ */
.meta-line {
  position: absolute;
  top: 64px; left: 112px; right: 112px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-sans);
  font-size: 18px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 500;
}
.meta-line .accent { color: var(--clay); font-weight: 600; }

/* footer brand */
.brand {
  position: absolute;
  bottom: 56px; left: 112px; right: 112px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-sans);
  font-size: 18px;
  color: var(--ink-light);
  letter-spacing: 0.06em;
}

/* ============================================================
 * Cover slide
 * ============================================================ */
.cover {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 160px;
}
.cover-eyebrow {
  font-family: var(--font-sans);
  font-size: 22px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay);
  font-weight: 600;
  margin-bottom: 56px;
}
.cover-title {
  font-family: var(--font-serif);
  font-size: 116px;
  line-height: 1.04;
  letter-spacing: -0.018em;
  color: var(--ink);
  font-weight: 500;
  margin: 0 0 40px 0;
  max-width: 1520px;
}
.cover-subtitle {
  font-family: var(--font-serif);
  font-size: 36px;
  line-height: 1.4;
  color: var(--ink-mute);
  font-weight: 400;
  font-style: italic;
  max-width: 1300px;
  margin: 0;
}

/* Cover QR — スマホで開く / 講義中のフォロー導線 */
.cover-qr {
  position: absolute;
  top: 64px;
  right: 112px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.cover-qr img {
  width: 140px;
  height: 140px;
  background: var(--paper);
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.cover-qr span {
  font-family: var(--font-sans);
  font-size: 17px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ============================================================
 * Standard content slide
 * ============================================================ */
.content {
  position: absolute;
  inset: 176px 112px 128px 112px;
}
.content-eyebrow {
  font-family: var(--font-sans);
  font-size: 20px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay);
  font-weight: 600;
  margin-bottom: 28px;
}
.content-title {
  font-family: var(--font-serif);
  font-size: 76px;
  line-height: 1.13;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.012em;
  margin: 0 0 28px 0;
  max-width: 1520px;
}
.content-subtitle {
  font-family: var(--font-serif);
  font-size: 32px;
  line-height: 1.45;
  color: var(--ink-mute);
  font-style: italic;
  font-weight: 400;
  margin: 0 0 56px 0;
  max-width: 1400px;
}

.rule {
  width: 64px;
  height: 3px;
  background: var(--clay);
  margin: 0 0 48px 0;
  border: 0;
}

/* ============================================================
 * Body prose
 * ============================================================ */
.prose {
  font-family: var(--font-sans);
  font-size: 30px;
  line-height: 1.62;
  color: var(--ink-2);
  font-weight: 400;
  max-width: 1500px;
}
.prose p { margin: 0 0 24px 0; }
.prose strong, .prose b { color: var(--ink); font-weight: 600; }
.prose em { color: var(--clay-deep); font-style: italic; }

/* ============================================================
 * Quiet list (dashed)
 * ============================================================ */
ul.dashed {
  list-style: none;
  padding: 0;
  margin: 0;
}
ul.dashed > li {
  position: relative;
  padding-left: 40px;
  margin-bottom: 32px;
  font-size: 30px;
  line-height: 1.6;
  color: var(--ink-2);
}
ul.dashed > li::before {
  content: "";
  position: absolute;
  left: 0; top: 24px;
  width: 22px; height: 1px;
  background: var(--clay);
}
ul.dashed > li strong { color: var(--ink); font-weight: 600; }

/* ============================================================
 * Two-column layout
 * ============================================================ */
.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
}
.cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 64px;
}
.col-label {
  font-family: var(--font-sans);
  font-size: 18px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay);
  font-weight: 600;
  margin-bottom: 20px;
}
.col-body {
  font-family: var(--font-sans);
  font-size: 26px;
  line-height: 1.6;
  color: var(--ink-2);
}
.col-body strong { color: var(--ink); font-weight: 600; }

/* ============================================================
 * Pull quote (large italic serif, with leading curly quote)
 * ============================================================ */
.pullquote {
  font-family: var(--font-serif);
  font-size: 64px;
  line-height: 1.3;
  color: var(--ink);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.008em;
  max-width: 1500px;
  margin: 0;
}
.pullquote-mark {
  font-family: var(--font-serif);
  font-size: 120px;
  color: var(--clay);
  line-height: 0.5;
  display: block;
  margin-bottom: 24px;
}

/* ============================================================
 * Timeline (year + title + body)
 * ============================================================ */
.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 24px;
}
.timeline > .step {
  position: relative;
  padding: 8px 40px 8px 32px;
  border-left: 1px solid var(--rule);
}
.timeline > .step.active { border-left: 3px solid var(--clay); }
.step-year {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  color: var(--clay);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
  font-weight: 500;
}
.step-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 16px;
  line-height: 1.2;
}
.step-body {
  font-family: var(--font-sans);
  font-size: 22px;
  line-height: 1.6;
  color: var(--ink-mute);
}

/* ============================================================
 * Mono / code
 * ============================================================ */
code, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--clay-haze);
  padding: 2px 10px;
  border-radius: 3px;
  color: var(--clay-deep);
  font-weight: 500;
}

/* ============================================================
 * Aside / footnote (small, muted)
 * ============================================================ */
.aside {
  font-family: var(--font-sans);
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-light);
  margin-top: 32px;
}
.aside strong { color: var(--ink-mute); }

/* ============================================================
 * Section break / divider slide
 * ============================================================ */
.section-break {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 160px;
}
.section-number {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 32px;
  color: var(--clay);
  letter-spacing: 0.04em;
  margin-bottom: 32px;
  font-weight: 500;
}
.section-title {
  font-family: var(--font-serif);
  font-size: 96px;
  line-height: 1.1;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0;
  max-width: 1500px;
}

/* ============================================================
 * Comparison matrix (e.g. Claude Code vs others)
 * .matrix-5 = 5 data columns, .matrix-3 = 3 data columns
 * ============================================================ */
.matrix {
  display: grid;
  margin-top: 12px;
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
  font-family: var(--font-sans);
}
.matrix-5 { grid-template-columns: 200px repeat(5, 1fr); }
.matrix-3 { grid-template-columns: 280px repeat(3, 1fr); }
.matrix-2 { grid-template-columns: 200px repeat(2, 1fr); }

.m-cell {
  padding: 18px 20px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: 22px;
  line-height: 1.45;
  color: var(--ink-2);
  display: flex;
  align-items: center;
}
.matrix-3 .m-cell {
  padding: 22px 28px;
  font-size: 24px;
}

.m-cell.m-corner {
  background: transparent;
}
.m-cell.m-head {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 500;
  color: var(--ink);
  background: var(--cream-soft);
  letter-spacing: -0.005em;
}
.matrix-3 .m-cell.m-head { font-size: 30px; }

.m-cell.m-row {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--clay);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--cream-soft);
}
.m-row-sub {
  display: block;
  font-size: 15px;
  font-weight: 400;
  color: var(--ink-light);
  text-transform: none;
  letter-spacing: 0.02em;
  margin-top: 4px;
}

.m-cell.m-hi {
  background: var(--clay-haze);
  color: var(--ink);
}
.m-cell.m-hi.m-head {
  background: var(--clay-soft);
  color: var(--clay-deep);
}
.m-cell.m-hi strong { color: var(--ink); font-weight: 600; }

/* ============================================================
 * Quadrant layout (2 × 2 examples)
 * ============================================================ */
.quad {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 56px;
  margin-top: 8px;
}
.quad-cell {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 20px;
  align-items: start;
}
.quad-img {
  width: 130px;
  height: 130px;
  object-fit: cover;
  border-radius: 4px;
  grid-row: span 4;
}
.quad-cell .col-label,
.quad-cell .quad-quote,
.quad-cell .quad-note,
.quad-cell .quad-more {
  grid-column: 2;
}
.quad-cell .quad-quote {
  font-size: 22px;
  line-height: 1.4;
  margin: 4px 0 6px 0;
}
.quad-cell .quad-note {
  font-size: 17px;
}
.quad-cell .quad-more {
  margin: 4px 0 0 0;
  padding: 0 0 0 18px;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-2);
}
.quad-cell .quad-more li {
  margin-bottom: 3px;
}
.quad-quote {
  font-family: var(--font-serif);
  font-size: 30px;
  line-height: 1.4;
  color: var(--ink);
  font-weight: 500;
  font-style: italic;
  margin: 12px 0 16px 0;
  letter-spacing: -0.005em;
}
.quad-quote::before {
  content: "「";
  color: var(--clay);
  font-style: normal;
}
.quad-quote::after {
  content: "」";
  color: var(--clay);
  font-style: normal;
}
.quad-note {
  font-family: var(--font-sans);
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-mute);
  margin: 0;
}

/* ============================================================
 * Purposes grid (4 × 2 — Claude Code を使う 8 領域)
 * ============================================================ */
.purposes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px 18px;
  margin-top: 8px;
}
.purpose-cell {
  padding: 12px 14px 14px 16px;
  border-left: 3px solid var(--clay);
  background: rgba(204, 120, 92, 0.05);
  border-radius: 0 4px 4px 0;
  display: flex;
  flex-direction: column;
  min-height: 180px;
}
.purpose-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.purpose-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: 6px;
  background: rgba(204, 120, 92, 0.12);
  overflow: hidden;
}
.purpose-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.purpose-meta {
  flex: 1;
  min-width: 0;
}
.purpose-num {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--clay-deep);
  font-weight: 600;
  margin: 0 0 3px 0;
  text-transform: uppercase;
}
.purpose-title {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  color: var(--ink-strong);
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.005em;
}
.purpose-more {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.45;
  margin: 0;
  padding: 0;
  list-style: none;
}
.purpose-more li {
  margin-bottom: 5px;
  padding-left: 12px;
  position: relative;
}
.purpose-more li::before {
  content: "・";
  position: absolute;
  left: 0;
  color: var(--clay);
}
.purpose-more li:last-child {
  margin-bottom: 0;
}

/* ============================================================
 * Stats grid (large numerical evidence)
 * ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 56px;
  margin-top: 16px;
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-num {
  font-family: var(--font-serif);
  font-size: 92px;
  font-weight: 500;
  line-height: 1;
  color: var(--clay-deep);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.stat-unit {
  font-size: 56px;
  color: var(--clay);
}
.stat-label {
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: -0.005em;
}
.stat-note {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-mute);
}

/* ============================================================
 * Roadmap (vertical numbered list, e.g. lecture series outline)
 * ============================================================ */
.roadmap {
  display: flex;
  flex-direction: column;
  margin-top: 16px;
  border-top: 1px solid var(--rule);
}
.rm-row {
  display: grid;
  grid-template-columns: 96px 1fr auto;
  align-items: baseline;
  gap: 32px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--rule);
}
.rm-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 32px;
  font-weight: 500;
  color: var(--clay);
  letter-spacing: -0.005em;
}
.rm-title {
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.3;
  color: var(--ink);
  font-weight: 500;
}
.rm-tag {
  font-family: var(--font-sans);
  font-size: 17px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  font-weight: 500;
}

/* ============================================================
 * Progress strip — 下部に全スライドの位置を表示
 * （scripts/progress-strip.js が自動で各スライドに注入する）
 * ============================================================ */
.progress-strip {
  position: absolute;
  bottom: 96px;
  left: 112px;
  right: 112px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  pointer-events: none;
}
.ps-step {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 0 1 auto;
  min-width: 0;
}
.ps-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--rule);
  flex-shrink: 0;
}
/* 本題（各章）のドットはクレイ色で塗る。それ以外（Cover/Coda/AI Buddy/Credits）は薄いグレーのまま */
.ps-step.main .ps-dot {
  background: var(--clay);
}
.ps-step.active .ps-dot {
  background: var(--clay);
  width: 9px;
  height: 9px;
  box-shadow: 0 0 0 4px var(--clay-haze);
}
.ps-label {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--ink-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ps-step.active .ps-label {
  color: var(--clay-deep);
  font-weight: 600;
}

/* ============================================================
 * Credits list (章末 Credits スライドの貢献者一覧)
 * 名前が増えても多段組みで流れるよう column 指定。
 * ============================================================ */
.credits-author {
  font-family: var(--font-sans);
  font-size: 19px;
  color: var(--ink);
  margin: 8px 0 0 0;
}
.credits-list {
  list-style: none;
  margin: 12px 0 0 0;
  padding: 0;
  column-count: 3;
  column-gap: 48px;
}
.credits-list li {
  font-family: var(--font-sans);
  font-size: 19px;
  color: var(--ink);
  padding: 7px 0;
  break-inside: avoid;
}
.credits-list li a {
  color: var(--clay-deep);
  text-decoration: none;
}
.credits-empty {
  color: var(--ink-mute);
  font-style: italic;
}

/* ============================================================
 * Solution header (large 01/02/03 number + title)
 * ============================================================ */
.solution-header {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: baseline;
  margin: 0 0 16px 0;
}
.solution-num {
  font-family: var(--font-serif);
  font-size: 200px;
  font-weight: 500;
  line-height: 0.85;
  color: var(--clay);
  letter-spacing: -0.04em;
  text-align: center;
}

/* ============================================================
 * Voices — quoted callout block (e.g. "他の声" references)
 * ============================================================ */
.voices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin: 36px 0 24px 0;
  padding: 28px 36px;
  background: var(--cream-soft);
  border-left: 3px solid var(--clay);
}
.voice {}
.voice-quote {
  font-family: var(--font-serif);
  font-size: 26px;
  font-style: italic;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.4;
  margin: 0 0 10px 0;
  letter-spacing: -0.005em;
}
.voice-attr {
  font-family: var(--font-sans);
  font-size: 17px;
  color: var(--ink-mute);
  margin: 0;
  letter-spacing: 0.02em;
}

/* ============================================================
 * Resources — recommended external resources block
 * ============================================================ */
.resources {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.res-label {
  font-family: var(--font-sans);
  font-size: 16px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay);
  font-weight: 600;
  margin-bottom: 18px;
}
.res-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.res-cell {}
.res-channel {
  font-family: var(--font-sans);
  font-size: 17px;
  color: var(--ink-mute);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
.res-video {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  border-bottom: 1px solid var(--clay);
  display: inline;
}
.res-video:hover { color: var(--clay-deep); }
.res-meta {
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink-light);
  margin-top: 10px;
  letter-spacing: 0.02em;
}

/* ============================================================
 * AI Buddy — 末尾スライドで AI 向け命令を可視化するブロック
 * 人間にも AI にも読める。受講者の AI に「同意を取った上で
 * 匿名化して GitHub に投稿する」プロトコルを伝える役割
 * ============================================================ */
.ai-buddy {
  background: var(--cream-soft);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--clay);
  padding: 22px 28px 24px 28px;
  border-radius: 4px;
  margin-top: 4px;
}
.ai-buddy .ai-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay-deep);
  background: var(--clay-soft);
  padding: 3px 10px;
  border-radius: 3px;
  font-weight: 700;
  margin-bottom: 12px;
}
.ai-buddy .ai-instructions {
  white-space: pre-wrap;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
}
.ai-buddy .ai-instructions strong {
  color: var(--clay-deep);
  font-weight: 600;
}
.ai-buddy .ai-instructions em {
  color: var(--ink);
  font-style: normal;
  font-weight: 600;
}

/* この章の焦点 — cover の data-label から ai-focus.js が動的に注入 */
.ai-focus {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-top: 22px;
  padding: 16px 22px;
  background: var(--clay-haze);
  border-left: 4px solid var(--clay);
  border-radius: 4px;
}
.ai-focus-label {
  flex: none;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay-deep);
}
.ai-focus-value {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--ink);
}