:root {
  --ink: #23281f;
  --ink-soft: #5b6152;
  --accent: #2f5233;
  --accent-2: #b5811b;
  --page: #f2efe2;
  --page-line: #d8d2bc;
  --shell: #12160f;
  --shell-2: #1b2116;
  --gold: #c9a45c;
  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Source Sans 3', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--shell);
  overflow: hidden;
  font-family: var(--sans);
}

body {
  background:
    radial-gradient(120% 90% at 50% -10%, #263120 0%, transparent 60%),
    radial-gradient(140% 100% at 50% 110%, #0c0f0a 0%, transparent 55%),
    var(--shell);
}

#stage {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2600px;
}

.book {
  position: relative;
  width: min(92vw, 1180px);
  aspect-ratio: 16 / 9.6;
  max-height: 82vh;
  transform-style: preserve-3d;
}

.leaf {
  position: absolute;
  inset: 0;
  background: var(--page);
  border-radius: 10px;
  box-shadow:
    0 2px 0 rgba(255,255,255,.4) inset,
    0 30px 70px -30px rgba(0,0,0,.65),
    0 8px 20px -8px rgba(0,0,0,.5);
  overflow: hidden;
  backface-visibility: hidden;
  transform-origin: right center;
  transform-style: preserve-3d;
}

#leafBack { z-index: 1; }
#leafFront {
  z-index: 2;
  transition: transform .68s cubic-bezier(.61,.03,.35,1), box-shadow .68s ease;
}
#leafFront.flip-next {
  transform-origin: right center;
  transform: rotateY(-178deg);
  box-shadow:
    0 2px 0 rgba(255,255,255,.4) inset,
    40px 20px 80px -20px rgba(0,0,0,.7);
}
#leafFront.flip-prev {
  transform-origin: left center;
  transform: rotateY(178deg);
  box-shadow:
    0 2px 0 rgba(255,255,255,.4) inset,
    -40px 20px 80px -20px rgba(0,0,0,.7);
}

.leaf::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; right: 0;
  width: 26%;
  background: linear-gradient(to left, rgba(0,0,0,.05), transparent);
  pointer-events: none;
}

/* ---- page content ---- */
.page-inner {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
}
.page-inner.cover { grid-template-columns: 1fr; }

.pane-art { position: relative; background: #0c0f0a; }
.pane-art img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pane-art .art-tag {
  position: absolute; left: 18px; bottom: 16px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em;
  color: rgba(255,255,255,.75); text-transform: uppercase;
  background: rgba(0,0,0,.35); padding: 5px 10px; border-radius: 999px;
  backdrop-filter: blur(2px);
}

.pane-text {
  padding: clamp(20px, 3.4vw, 48px) clamp(20px, 3.6vw, 52px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(10px, 1.6vh, 18px);
  color: var(--ink);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.entry-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.04;
  margin: 0 0 4px;
  color: var(--ink);
  text-wrap: balance;
}

.facts { display: flex; flex-direction: column; gap: clamp(8px, 1.4vh, 14px); border-top: 1px solid var(--page-line); padding-top: clamp(10px, 1.6vh, 16px); }
.fact { display: grid; grid-template-columns: 58px 1fr; gap: 12px; }
.fact dt { font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-2); margin: 0; }
.fact dd { margin: 0; font-size: clamp(13px, 1.35vw, 16px); line-height: 1.45; color: var(--ink); }

.note {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-soft);
  margin: 4px 0 0;
}

/* ---- cover ---- */
.cover-inner {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #f2efe2;
  background:
    linear-gradient(180deg, rgba(10,13,8,.15), rgba(8,10,6,.75)),
    url('images/12_shank.jpg') center 30% / cover no-repeat;
  gap: 14px;
  padding: 24px;
}
.cover-eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold);
}
.cover-title {
  font-family: var(--serif); font-weight: 900; font-size: clamp(34px, 6vw, 68px);
  margin: 0; line-height: 1; text-wrap: balance;
}
.cover-sub {
  font-family: var(--serif); font-weight: 500; font-style: italic;
  font-size: clamp(16px, 2vw, 22px); color: var(--gold); margin: 0;
}
.cover-desc {
  font-family: var(--sans); font-size: 14px; color: rgba(242,239,226,.8);
  max-width: 46ch; margin: 6px 0 6px;
}
.cover-cta {
  font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink); background: var(--gold); border: none; padding: 12px 22px;
  border-radius: 999px; cursor: pointer; margin-top: 6px;
}
.cover-cta:hover { filter: brightness(1.06); }

/* ---- nav zones (tap-to-turn) ---- */
.nav-zone {
  position: absolute; top: 0; bottom: 0; width: 18%;
  background: transparent; border: none; cursor: pointer; z-index: 5;
}
.nav-prev { left: 0; }
.nav-next { right: 0; }

/* ---- chrome ---- */
.chrome {
  position: fixed; left: 0; right: 0; bottom: 0;
  padding: 14px 18px calc(14px + env(safe-area-inset-bottom, 0px));
  display: flex; flex-direction: column; gap: 10px; align-items: center;
  z-index: 10;
}
.progress { width: min(420px, 70vw); height: 3px; background: rgba(255,255,255,.14); border-radius: 3px; overflow: hidden; }
.progress-bar { height: 100%; width: 0%; background: var(--gold); transition: width .5s ease; }
.controls { display: flex; align-items: center; gap: 18px; }
.chrome-btn {
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.06); color: #f2efe2; font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.chrome-btn:hover { background: rgba(255,255,255,.14); }
.chrome-btn:disabled { opacity: .3; cursor: default; }
.page-count { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; color: rgba(242,239,226,.85); min-width: 120px; text-align: center; }

@media (max-width: 760px) {
  .book { aspect-ratio: 3/4.3; max-height: 78vh; }
  .page-inner:not(.cover) { grid-template-columns: 1fr; grid-template-rows: 46% 54%; }
  .fact { grid-template-columns: 50px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  #leafFront { transition: none; }
}