/* ============================================================
   BLANK_ Concept Book — elegant variant (本体 LP に合わせた品格)
   - 1 page = 1 idea, scroll-snap full-screen
   - cream + ink + gold のみ
   - Noto Serif JP (大見出し / 引用) + Inter (chrome / chip) + Noto Sans JP (本文)
   ============================================================ */

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #0f0f0f;
  --cream: #fbf6ec;
  --cream-deep: #f3eddc;
  --paper: #fffdf6;
  --ink: #1a1611;
  --ink-soft: #4a4338;
  --gold: #b8945f;
  --gold-light: #d4b880;
  --gold-border: rgba(184, 148, 95, 0.18);
  --text-primary: #e8e2d8;
  --text-secondary: rgba(232, 226, 216, 0.6);
  --text-muted: rgba(232, 226, 216, 0.32);
  --font-display: "Noto Serif JP", "Hiragino Mincho ProN", "Source Serif 4", serif;
  --font-en: "Inter", "Helvetica Neue", -apple-system, sans-serif;
  --font-jp-serif: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --font-jp-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
}

.deck-root {
  font-family: var(--font-jp-sans);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
  color: var(--ink);
  background: var(--cream);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.deck-root *, .deck-root *::before, .deck-root *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.deck-root ::selection { background: var(--ink); color: var(--gold-light); }

.deck {
  height: 100vh;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}
.deck::-webkit-scrollbar { width: 0; }

.slide {
  height: 100vh;
  width: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: 64px 56px 64px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.slide.bg-cream { background: var(--cream); color: var(--ink); }
.slide.bg-paper { background: var(--paper); color: var(--ink); }
.slide.bg-deep  { background: var(--cream-deep); color: var(--ink); }
.slide.bg-ink   { background: var(--bg-primary); color: var(--text-primary); }

/* photo bg ─ NOT A HOTEL Minakami の写真を full-bleed で */
.slide.bg-photo {
  background: var(--bg-primary);
  color: var(--text-primary);
  position: relative;
}
.slide.bg-photo > * { position: relative; z-index: 2; }
.slide.bg-photo::before {
  content: ""; position: absolute; inset: 0;
  background: var(--photo, none) center/cover no-repeat;
  z-index: 0;
}
.slide.bg-photo::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(10,10,10,0.32) 0%, rgba(10,10,10,0.72) 100%);
  z-index: 1;
}
/* photo 上のテキストは ink 系で扱う */
.slide.bg-photo .slide-top-chapter,
.slide.bg-photo .eyebrow { color: var(--gold-light); }
.slide.bg-photo .headline,
.slide.bg-photo .mega,
.slide.bg-photo .chapter-title-en { color: var(--text-primary); }
.slide.bg-photo .stat-num { color: var(--gold-light); }
.slide.bg-photo .headline-jp,
.slide.bg-photo .headline-sub,
.slide.bg-photo .stat-label,
.slide.bg-photo .body-line,
.slide.bg-photo .quote-text { color: var(--text-secondary); }
.slide.bg-photo .chapter-title-jp { color: rgba(255, 253, 246, 0.78); }
.slide.bg-photo .chapter-num { color: var(--gold-light); }
.slide.bg-photo .chip {
  color: var(--text-primary);
  border-bottom-color: rgba(255, 253, 246, 0.35);
}
.slide.bg-photo .slide-top { color: var(--text-muted); opacity: 0.55; }
.slide.bg-photo .progress-bar { background: rgba(184, 148, 95, 0.3); }

/* ── chrome (top / bottom) ─ 静かに ──────────────────────── */
.slide-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-en);
  font-size: 10.5px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--ink-soft);
  flex-shrink: 0;
  opacity: 0.32;
}
.slide.bg-ink .slide-top { color: var(--text-muted); opacity: 0.45; }
.slide-top-left { display: flex; align-items: center; gap: 12px; }
.slide-top-chapter { color: var(--gold); font-weight: 500; }
.slide.bg-ink .slide-top-chapter { color: var(--gold-light); }

.slide-bottom {
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--ink-soft);
  flex-shrink: 0;
  opacity: 0;
  pointer-events: none;
}
.slide-bottom > span { display: none; }
.progress-bar {
  width: 56px; height: 1px;
  background: var(--gold-border);
  position: relative;
  overflow: hidden;
  opacity: 1;
}
.slide.bg-ink .progress-bar { background: rgba(184, 148, 95, 0.25); }
.progress-bar-fill {
  position: absolute; inset: 0;
  background: var(--gold);
  transform-origin: left center;
  opacity: 0.7;
}

/* ── body ───────────────────────────────────────────────── */
.slide-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  gap: 32px;
  padding: 32px 0;
  max-width: 1040px;
  margin: 0 auto;
  width: 100%;
}

/* ── content tokens ─────────────────────────────────────── */
.eyebrow {
  font-family: var(--font-en);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.6rem;
  opacity: 0.95;
}
.slide.bg-ink .eyebrow { color: var(--gold-light); opacity: 1; }

.headline {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.005em;
  font-size: clamp(40px, 6.6vw, 92px);
  color: var(--ink);
  text-transform: none;
}
.slide.bg-ink .headline { color: var(--text-primary); }
.headline .accent { color: var(--gold); font-style: italic; opacity: 0.85; font-weight: 700; }
.headline-jp {
  font-family: var(--font-jp-serif);
  font-weight: 700;
  line-height: 1.5;
  font-size: clamp(34px, 5.4vw, 72px);
  letter-spacing: 0.02em;
  color: var(--ink);
}
.slide.bg-ink .headline-jp { color: var(--text-primary); }
.headline-jp .accent { color: var(--gold); }

.headline-sub {
  font-family: var(--font-jp-sans);
  font-size: clamp(17px, 1.95vw, 22px);
  font-weight: 500;
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  max-width: 760px;
}
.slide.bg-ink .headline-sub { color: var(--text-secondary); }

.body-line {
  font-family: var(--font-jp-sans);
  font-size: clamp(14px, 1.55vw, 16px);
  font-weight: 500;
  line-height: 1.95;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  max-width: 680px;
  margin-top: 0.6rem;
  opacity: 0.85;
}
.slide.bg-ink .body-line { color: var(--text-secondary); }

.mega {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 0.98;
  font-size: clamp(80px, 14.5vw, 220px);
  letter-spacing: -0.015em;
  color: var(--ink);
  text-transform: none;
  overflow-wrap: break-word;
  max-width: 100%;
}
.slide.bg-ink .mega { color: var(--text-primary); }
.mega .accent { color: var(--gold); font-style: italic; opacity: 0.95; }

/* chapter divider */
.chapter-num {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.55em;
  color: var(--gold-light);
  text-transform: uppercase;
  margin-bottom: 1.6rem;
  opacity: 0.85;
}
.chapter-title-en {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(48px, 7.4vw, 108px);
  line-height: 1.12;
  letter-spacing: -0.005em;
  color: var(--text-primary);
  text-transform: none;
  overflow-wrap: break-word;
}
.chapter-title-en .slash {
  display: inline-block;
  width: 0.6em;
  border-bottom: 1px solid var(--gold);
  margin: 0 0.3em 0.25em;
  vertical-align: middle;
  height: 1px;
}
.chapter-title-jp {
  font-family: var(--font-jp-serif);
  font-size: clamp(17px, 2.1vw, 24px);
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 1.4rem;
  letter-spacing: 0.28em;
}

/* chips */
.chips { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: baseline; }
.chip {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  padding: 0 0 6px 0;
  border: none;
  background: transparent;
  border-bottom: 1.5px solid var(--gold-border);
  color: var(--ink-soft);
}
.slide.bg-ink .chip { color: var(--text-primary); border-bottom-color: rgba(184, 148, 95, 0.4); }
.chip.jp { font-family: var(--font-jp-serif); font-weight: 600; letter-spacing: 0.14em; }

/* stat */
.stat-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(128px, 22vw, 320px);
  line-height: 0.95;
  color: var(--gold);
  letter-spacing: -0.02em;
  max-width: 100%;
  word-break: break-word;
}
.slide.bg-ink .stat-num { color: var(--gold-light); }
.stat-num.long {
  font-size: clamp(64px, 11vw, 156px);
  letter-spacing: -0.025em;
}
.stat-label {
  font-family: var(--font-jp-sans);
  font-size: clamp(14px, 1.55vw, 17px);
  font-weight: 500;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 1.5rem auto 0;
}
.slide.bg-ink .stat-label { color: var(--text-secondary); }

/* quote */
.quote-text {
  font-family: var(--font-jp-serif);
  font-weight: 700;
  font-size: clamp(32px, 5vw, 64px);
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.slide.bg-ink .quote-text { color: var(--text-primary); }
.quote-author {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: var(--gold);
  margin-top: 2rem;
  opacity: 0.8;
}

/* CTA */
.reserve-link {
  display: inline-block;
  font-family: var(--font-en);
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  text-decoration: none;
  padding-bottom: 10px;
  border-bottom: 1.5px solid var(--gold);
  transition: color 0.4s ease, border-color 0.4s ease, letter-spacing 0.4s ease;
}
.reserve-link:hover {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
  letter-spacing: 0.45em;
}

/* ── floating chrome ────────────────────────────────────── */
.deck-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  background: var(--gold);
  opacity: 0.85;
  z-index: 60;
  transition: width 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}
.deck-counter {
  position: fixed;
  top: 18px; right: 24px;
  z-index: 55;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.45em;
  color: var(--ink-soft);
  background: rgba(251, 246, 236, 0.6);
  backdrop-filter: blur(6px);
  border: 1px solid var(--gold-border);
  padding: 6px 12px;
  text-transform: uppercase;
  pointer-events: none;
}
.back-link {
  position: fixed;
  top: 18px; left: 24px;
  z-index: 55;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.45em;
  color: var(--ink-soft);
  background: rgba(251, 246, 236, 0.6);
  backdrop-filter: blur(6px);
  border: 1px solid var(--gold-border);
  padding: 6px 14px;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.3s, border-color 0.3s;
}
.back-link:hover { color: var(--gold); border-color: var(--gold); }
.keyhint {
  position: fixed;
  bottom: 22px; right: 24px;
  z-index: 50;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--ink-soft);
  text-transform: uppercase;
  pointer-events: none;
  opacity: 0.5;
}

/* mermaid host */
.mermaid-host {
  width: 100%;
  max-width: 880px;
  min-height: 240px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
  background: transparent;
  border: 1px solid var(--gold-border);
  margin: 0 auto;
}

@media (max-width: 720px) {
  .slide { padding: 56px 24px 64px; }
  .keyhint { display: none; }
  .body-line { font-size: 14px; }
  .chips { gap: 12px 20px; }
}