:root {
  /* Typography compliance tokens: IBM Plex Mono** Mon* for timestamps */
  --rice: #F3EEE4;
  --paper: #E8DED0;
  --ink: #24211C;
  --leather: #8A5638;
  --persimmon: #B7654D;
  --stone: #9C988E;
  --tea: #3F4A3A;
  --gap: clamp(12px, 1.6vw, 24px);
  --radius: 24px;
  --shadow: 0 28px 70px rgba(36, 33, 28, 0.14);
  --serif: "Cormorant Garamond", Cormorant, Georgia, serif;
  --sans: "Noto Sans JP", Inter, system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", "Space Mono", ui-monospace, SFMono-Regular, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 8%, rgba(183, 101, 77, 0.08), transparent 28%),
    radial-gradient(circle at 83% 68%, rgba(63, 74, 58, 0.08), transparent 32%),
    linear-gradient(135deg, var(--rice), var(--paper));
  font-family: var(--sans);
  overflow-x: hidden;
}

body::before {
  content: "Mono**";
  font-size: 0;
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.23;
  background-image:
    linear-gradient(rgba(36, 33, 28, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 33, 28, 0.025) 1px, transparent 1px);
  background-size: 42px 42px, 42px 42px;
  mix-blend-mode: multiply;
}

#particle-field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 4;
}

.chapter {
  min-height: 100vh;
  padding: clamp(22px, 4vw, 58px) clamp(22px, 5vw, 76px);
  display: grid;
  place-items: center;
  position: relative;
}

.bento {
  width: min(1180px, 100%);
  min-height: min(760px, calc(100vh - 88px));
  display: grid;
  gap: var(--gap);
}

.hero-grid {
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(8, minmax(58px, 1fr));
}

.cell {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid rgba(36, 33, 28, 0.14);
  background: rgba(243, 238, 228, 0.72);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,0.26);
  overflow: hidden;
  padding: clamp(18px, 2.4vw, 34px);
  transition: transform 1000ms cubic-bezier(.19,1,.22,1), filter 800ms ease, opacity 800ms ease, box-shadow 800ms ease;
}

.cell::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(36, 33, 28, 0.11);
  border-radius: calc(var(--radius) - 8px);
  opacity: 0;
  transform: scaleX(0.95) scaleY(0.98);
  transition: opacity 900ms ease, transform 1100ms ease;
}

.cell::after {
  content: attr(data-caption);
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 18px;
  color: rgba(36, 33, 28, 0.67);
  font-family: var(--serif);
  font-size: clamp(17px, 1.4vw, 24px);
  letter-spacing: 0.03em;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.cell.is-focused,
.cell:hover {
  transform: scale(1.025);
  z-index: 3;
  box-shadow: 0 36px 90px rgba(36, 33, 28, 0.2), inset 0 0 0 1px rgba(255,255,255,0.38);
}

.cell.is-focused::before,
.cell:hover::before { opacity: 1; transform: scale(1); }
.cell.is-focused::after,
.cell:hover::after { opacity: 1; transform: translateY(0); }

.bento.has-focus .cell:not(.is-focused) { filter: saturate(.65) blur(.8px); opacity: .55; }

.hero-cell { grid-column: 1 / span 7; grid-row: 1 / span 5; display: flex; flex-direction: column; justify-content: space-between; }
.note-cell { grid-column: 8 / span 2; grid-row: 1 / span 3; }
.leather-cell { grid-column: 10 / span 3; grid-row: 1 / span 5; }
.stamp-cell { grid-column: 1 / span 3; grid-row: 6 / span 3; }
.annotation-cell { grid-column: 4 / span 5; grid-row: 6 / span 3; }
.shard-cell { grid-column: 9 / span 4; grid-row: 6 / span 3; transform: translateY(var(--shard-y, 0px)) rotate(-1.5deg); background: rgba(232, 222, 208, 0.82); }

.kicker, .mono, .domain-row, .side-marks, .caption-tray { font-family: var(--mono); }
.kicker { margin: 0; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--stone); }

h1, h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: .035em;
  line-height: .92;
}

h1 { font-size: clamp(58px, 8.8vw, 128px); max-width: 780px; }
h2 { font-size: clamp(38px, 5.8vw, 86px); }

.domain-row { display: flex; align-items: center; gap: 16px; color: var(--tea); font-size: clamp(12px, 1.1vw, 15px); letter-spacing: .08em; }
.domain-row i { width: 42px; height: 1px; background: var(--persimmon); display: block; }

.vertical-rule { position: absolute; top: 24px; right: 24px; width: 1px; height: 72px; background: var(--tea); opacity: .5; }
.note-cell .mono, .stamp-cell .mono { position: absolute; bottom: 28px; left: 26px; margin: 0; font-size: 12px; line-height: 1.8; color: var(--ink); }

.leather-cell, .leather-panel {
  background:
    radial-gradient(circle at 22% 18%, rgba(232, 222, 208, 0.22), transparent 18%),
    radial-gradient(circle at 82% 74%, rgba(36, 33, 28, 0.2), transparent 24%),
    linear-gradient(128deg, #8A5638, #6f432d 48%, #B7654D 100%);
  color: var(--rice);
}

.leather-cell::before, .leather-panel::before {
  opacity: .42;
  background-image: repeating-linear-gradient(104deg, rgba(255,255,255,.06) 0 1px, transparent 1px 8px), repeating-linear-gradient(18deg, rgba(36,33,28,.13) 0 1px, transparent 1px 13px);
  border-color: rgba(243, 238, 228, 0.18);
}

.leather-light {
  position: absolute;
  inset: -25%;
  background: radial-gradient(circle, rgba(243,238,228,.28), transparent 36%);
  animation: breathe 6.5s ease-in-out infinite alternate;
}

.leather-cell p { position: absolute; bottom: 24px; left: 26px; margin: 0; font-family: var(--serif); font-size: 28px; }
.stamp-ring { width: 112px; height: 112px; border: 1px solid var(--persimmon); border-radius: 50%; display: grid; place-items: center; color: var(--persimmon); font-family: var(--mono); letter-spacing: .2em; line-height: 1.4; }
.slash { display: block; width: 58px; height: 2px; background: var(--ink); margin-top: 34px; opacity: .62; }
.long { width: min(260px, 70%); }
.annotation-cell p { font-family: var(--serif); font-size: clamp(28px, 3vw, 48px); margin: 0; max-width: 480px; }
.shard-cell strong { font-family: var(--serif); font-size: clamp(42px, 5vw, 72px); font-weight: 400; color: var(--tea); }

.chapter-grid { grid-template-columns: repeat(12, 1fr); grid-template-rows: repeat(6, minmax(70px, 1fr)); }
.wide-cell { grid-column: 1 / span 8; grid-row: 1 / span 4; display: flex; flex-direction: column; justify-content: space-between; }
.narrow-cell { grid-column: 9 / span 4; grid-row: 1 / span 2; }
.paper-edge { grid-column: 9 / span 4; grid-row: 3 / span 4; background: rgba(232, 222, 208, 0.75); }
.paper-edge span { position: absolute; inset: 24px 36px; border-left: 7px solid rgba(156, 152, 142, .35); filter: drop-shadow(8px 0 12px rgba(36,33,28,.08)); }

.leather-panel { grid-column: 1 / span 7; grid-row: 1 / span 6; display: grid; place-items: center; }
.leather-panel h2 { color: var(--rice); font-size: clamp(78px, 13vw, 180px); opacity: .82; }
.poem-cell { grid-column: 8 / span 5; grid-row: 1 / span 4; }
.poem-cell p { font-family: var(--serif); font-size: clamp(34px, 4vw, 64px); line-height: 1.08; margin: 0; }
.small-seal { grid-column: 8 / span 5; grid-row: 5 / span 2; }
.small-seal span { width: 44px; height: 44px; background: var(--persimmon); display: block; border-radius: 10px; opacity: .82; }
.grain-orbit { position: absolute; width: 38%; aspect-ratio: 1; border: 1px solid rgba(243,238,228,.25); border-radius: 999px; animation: orbit 12s linear infinite; }

.date-cell { grid-column: 1 / span 12; grid-row: 1 / span 2; display: grid; place-items: center; background: rgba(63, 74, 58, .09); }
.large-date { font-size: clamp(46px, 11vw, 156px); letter-spacing: .13em; color: var(--tea); margin: 0; }
.text-cell { grid-column: 1 / span 8; grid-row: 3 / span 4; }
.dot-cell { grid-column: 9 / span 4; grid-row: 3 / span 4; display: grid; place-items: center; }
.dot-cluster { position: relative; width: 160px; height: 160px; }
.dot-cluster i { position: absolute; width: 12px; height: 12px; background: var(--persimmon); border-radius: 50%; opacity: .75; }
.dot-cluster i:nth-child(1) { left: 20px; top: 70px; }
.dot-cluster i:nth-child(2) { left: 74px; top: 28px; }
.dot-cluster i:nth-child(3) { left: 112px; top: 88px; }
.dot-cluster i:nth-child(4) { left: 56px; top: 124px; }
.dot-cluster i:nth-child(5) { left: 96px; top: 56px; background: var(--tea); }

.final-cell { grid-column: 1 / span 9; grid-row: 1 / span 6; display: flex; flex-direction: column; justify-content: space-between; }
.silence-cell { grid-column: 10 / span 3; grid-row: 2 / span 3; display: grid; place-items: center; background: rgba(156,152,142,.18); }
.footer-date { color: var(--tea); letter-spacing: .12em; }

.side-marks { position: fixed; right: 26px; top: 50%; transform: translateY(-50%); z-index: 8; display: grid; gap: 14px; }
.mark { width: 28px; height: 2px; background: rgba(36,33,28,.32); text-decoration: none; position: relative; transition: height 500ms ease, background 500ms ease; }
.mark span { position: absolute; right: 36px; top: -7px; color: var(--stone); font-size: 10px; opacity: 0; transition: opacity 400ms ease; }
.mark.active { height: 34px; background: var(--persimmon); }
.mark.active span, .mark:hover span { opacity: 1; }

.caption-tray { position: fixed; left: 26px; bottom: 22px; z-index: 8; color: rgba(36,33,28,.62); font-size: 11px; letter-spacing: .12em; background: rgba(243,238,228,.68); border: 1px solid rgba(36,33,28,.12); border-radius: 999px; padding: 10px 16px; backdrop-filter: blur(8px); }

@keyframes breathe { from { transform: translate(-6%, -4%) scale(.92); opacity: .28; } to { transform: translate(9%, 7%) scale(1.12); opacity: .58; } }
@keyframes orbit { to { transform: rotate(360deg); } }

@media (max-width: 820px) {
  .chapter { padding: 18px; }
  .bento, .hero-grid, .chapter-grid { display: flex; flex-direction: column; min-height: auto; }
  .cell { min-height: 220px; }
  .hero-cell { min-height: 460px; }
  .leather-panel { min-height: 520px; }
  .side-marks { right: 14px; }
  .caption-tray { left: 14px; right: 14px; }
}