/* ============================================================
   Sakurai-style deck (atsm.wtf 風) — フルスクリーン scroll-snap.
   - 1 page = 1 idea
   - 2 行 + ビジュアル
   - Londrina Solid heading + Noto Sans JP body + JetBrains Mono UI
   ============================================================ */

:root {
  --cream: #FBF3DB;
  --cream-deep: #F5E9C3;
  --ink: #1a1611;
  --ink-soft: #4a4338;
  --paper: #fffdf6;
  --red: #e04639;
  --red-deep: #b3372d;
  --yellow: #FFD43B;
  --yellow-soft: #FFE869;
  --muted: #5a5046;
  --tl-red: #ff5f57;
  --tl-yellow: #febc2e;
  --tl-green: #28c840;
}

.deck-root {
  font-family: "Inter", "Noto Sans JP", -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
  color: var(--ink);
  background: var(--cream);
}
.deck-root *, .deck-root *::before, .deck-root *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.deck-root ::selection { background: var(--ink); color: var(--yellow-soft); }

/* deck container — body 全体に適用 */
.deck {
  height: 100vh;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}
.deck::-webkit-scrollbar { width: 0; }

/* slide */
.slide {
  height: 100vh;
  width: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: 56px 40px 72px;
  display: flex;
  flex-direction: column;
  position: relative;
  border-bottom: 2px solid var(--ink);
  overflow: hidden;
}
.slide.bg-cream  { background: var(--cream); }
.slide.bg-paper  { background: var(--paper); }
.slide.bg-deep   { background: var(--cream-deep); }
.slide.bg-ink    { background: var(--ink); color: var(--paper); }
.slide.bg-red    { background: var(--red); color: var(--paper); }
.slide.bg-yellow { background: var(--yellow-soft); }

/* ── chrome (top / bottom) ─────────────────────────────── */
.slide-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.slide.bg-ink .slide-top, .slide.bg-red .slide-top { color: rgba(255,253,246,0.7); }
.slide-top-left { display: flex; align-items: center; gap: 12px; }
.traffic-lights { display: inline-flex; gap: 6px; }
.traffic-lights span {
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.15);
  display: block;
}
.traffic-lights .r { background: var(--tl-red); }
.traffic-lights .y { background: var(--tl-yellow); }
.traffic-lights .g { background: var(--tl-green); }
.slide-top-chapter { color: var(--red); font-weight: 600; }
.slide.bg-ink .slide-top-chapter, .slide.bg-red .slide-top-chapter { color: var(--yellow-soft); }

.slide-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  flex-shrink: 0;
}
.slide.bg-ink .slide-bottom, .slide.bg-red .slide-bottom { color: rgba(255,253,246,0.5); }
.progress-bar {
  flex: 1; height: 2px;
  background: rgba(26,22,17,0.12);
  margin: 0 16px;
  position: relative;
  overflow: hidden;
}
.slide.bg-ink .progress-bar, .slide.bg-red .progress-bar { background: rgba(255,253,246,0.18); }
.progress-bar-fill { position: absolute; inset: 0; background: var(--red); transform-origin: left center; }
.slide.bg-ink .progress-bar-fill, .slide.bg-red .progress-bar-fill { background: var(--yellow); }

/* ── body container ─────────────────────────────────────── */
.slide-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  gap: 24px;
  padding: 24px 0;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

/* ── content tokens ─────────────────────────────────────── */
.eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
}
.slide.bg-ink .eyebrow, .slide.bg-red .eyebrow { color: var(--yellow-soft); }
.eyebrow::before { content: "// "; opacity: 0.5; }

.headline {
  font-family: "Londrina Solid", "Inter", sans-serif;
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: 0.005em;
  text-transform: uppercase;
  font-size: clamp(48px, 9vw, 140px);
  word-break: keep-all;
  color: var(--ink);
  white-space: pre-line;
}
.slide.bg-ink .headline, .slide.bg-red .headline { color: var(--paper); }
.headline .accent { color: var(--red); }
.slide.bg-red .headline .accent { color: var(--yellow); }
.slide.bg-ink .headline .accent { color: var(--yellow); }
.slide.bg-yellow .headline .accent { color: var(--red); }

.headline-sub {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.slide.bg-ink .headline-sub, .slide.bg-red .headline-sub { color: rgba(255,253,246,0.92); }

.body-line {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(15px, 1.7vw, 20px);
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 760px;
  border-left: 4px solid var(--red);
  padding-left: 16px;
}
.slide.bg-ink .body-line, .slide.bg-red .body-line {
  color: rgba(255,253,246,0.85);
  border-left-color: var(--yellow);
}

.mega {
  font-family: "Londrina Solid", sans-serif;
  font-weight: 900;
  line-height: 0.86;
  text-transform: uppercase;
  font-size: clamp(80px, 22vw, 320px);
  letter-spacing: -0.01em;
  color: var(--ink);
}
.slide.bg-ink .mega, .slide.bg-red .mega { color: var(--paper); }
.mega .accent { color: var(--red); }
.slide.bg-red .mega .accent, .slide.bg-ink .mega .accent { color: var(--yellow); }

.chapter-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--yellow);
  text-transform: uppercase;
  margin-bottom: 24px;
}
.chapter-title-en {
  font-family: "Londrina Solid", sans-serif;
  font-weight: 900;
  font-size: clamp(64px, 13vw, 200px);
  line-height: 0.9;
  text-transform: uppercase;
  color: var(--paper);
  word-break: keep-all;
}
.chapter-title-en .slash { color: var(--red); }
.chapter-title-jp {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  color: rgba(255,253,246,0.85);
  margin-top: 20px;
  letter-spacing: 0.04em;
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 10px;
  border: 1.5px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}
.slide.bg-ink .chip { background: transparent; border-color: var(--paper); color: var(--paper); }
.slide.bg-red .chip { background: transparent; border-color: var(--paper); color: var(--paper); }

.stat-num {
  font-family: "Londrina Solid", sans-serif;
  font-weight: 900;
  font-size: clamp(120px, 26vw, 360px);
  line-height: 0.85;
  color: var(--red);
  letter-spacing: -0.02em;
}
.slide.bg-ink .stat-num, .slide.bg-red .stat-num { color: var(--yellow); }
.slide.bg-yellow .stat-num { color: var(--ink); }
.stat-label {
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 600;
  color: var(--ink);
}
.slide.bg-ink .stat-label, .slide.bg-red .stat-label { color: var(--paper); }

.quote-text {
  font-family: "Noto Serif JP", "Source Serif 4", serif;
  font-weight: 500;
  font-size: clamp(34px, 6vw, 84px);
  line-height: 1.25;
  color: var(--ink);
}
.slide.bg-ink .quote-text, .slide.bg-red .quote-text { color: var(--paper); }
.quote-author {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 24px;
}
.slide.bg-ink .quote-author, .slide.bg-red .quote-author { color: rgba(255,253,246,0.7); }

/* ── floating chrome ────────────────────────────────────── */
.deck-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--red);
  z-index: 60;
  transition: width 0.15s linear;
}
.deck-counter {
  position: fixed;
  top: 12px; right: 16px;
  z-index: 55;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  background: rgba(255,253,246,0.85);
  border: 1.5px solid var(--ink);
  padding: 4px 8px;
  text-transform: uppercase;
  pointer-events: none;
}
.back-link {
  position: fixed;
  top: 12px; left: 16px;
  z-index: 55;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: rgba(255,253,246,0.85);
  border: 1.5px solid var(--ink);
  padding: 4px 10px;
  text-transform: uppercase;
  text-decoration: none;
}
.back-link:hover { background: var(--yellow-soft); }
.keyhint {
  position: fixed;
  bottom: 18px; right: 20px;
  z-index: 50;
  font-family: "JetBrains Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--ink-soft);
  background: rgba(255,253,246,0.85);
  border: 1.5px solid var(--ink);
  padding: 6px 10px;
  text-transform: uppercase;
  pointer-events: none;
  transition: opacity 0.3s;
}

/* ── Mermaid host ───────────────────────────────────────── */
.mermaid-host {
  width: 100%;
  max-width: 900px;
  min-height: 220px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px;
  background: var(--paper);
  border: 2px solid var(--ink);
  margin: 0 auto;
}
.slide.bg-ink .mermaid-host, .slide.bg-red .mermaid-host {
  background: rgba(255,253,246,0.06);
  border-color: var(--paper);
}

@media (max-width: 720px) {
  .slide { padding: 56px 22px 64px; }
  .keyhint { display: none; }
  .body-line { font-size: 15px; }
}