/* Book detail page */
.book-detail {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 40px 40px;
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 72px;
  align-items: start;
}
.book-detail .cover-col { position: sticky; top: 100px; }
.book-detail .cover-front { box-shadow: 0 40px 60px -20px oklch(0 0 0 / 0.35); }
.book-detail .meta-row {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 18px;
}
.book-detail h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 5.5vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}
.book-detail .sub {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 22px;
  margin: 0 0 32px;
  max-width: 36ch;
}
.book-detail .buy {
  display: inline-block;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--parchment);
  background: var(--ink);
  padding: 14px 22px;
  text-decoration: none;
  margin: 0 12px 32px 0;
  transition: background 200ms ease;
}
.book-detail .buy:hover { background: var(--gold-deep); }
.book-detail .buy--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.book-detail .buy--ghost:hover { background: var(--ink); color: var(--parchment); }
.book-detail .blurbs {
  margin: 48px 0;
  padding: 36px 0;
  border-top: 1px solid oklch(0.22 0.02 50 / 0.1);
  border-bottom: 1px solid oklch(0.22 0.02 50 / 0.1);
}
.book-detail .blurb {
  font-family: var(--serif);
  font-style: italic;
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink);
  max-width: 52ch;
  margin: 0 0 18px;
}
.book-detail .blurb cite {
  display: block;
  font-style: normal;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 10px;
}
.book-detail .sample {
  margin-top: 56px;
}
.book-detail .sample-head {
  display: flex; align-items: baseline; justify-content: space-between;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 36px;
}
.book-detail .sample-head h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0;
  margin: 0;
}
.book-detail .sample-head .chapter {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-faint);
  font-size: 14px;
}
.book-detail .sample-body {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.7;
  max-width: 64ch;
}
.book-detail .sample-body p:first-of-type::first-letter {
  font-size: 54px;
  line-height: 0.9;
  float: left;
  padding: 6px 12px 0 0;
  font-weight: 500;
  color: var(--gold-deep);
}
.book-detail .sample-body p { margin: 0 0 20px; }
.book-detail .end-mark {
  width: 32px; height: 1px; background: var(--gold);
  margin: 40px 0;
}
@media (max-width: 720px) {
  .book-detail { grid-template-columns: 1fr; gap: 40px; padding: 40px 22px; }
  .book-detail .cover-col { position: static; max-width: 220px; }
}

/* Book page action bar */
.book-page {
  --book-action-bar-height: 72px;
  --book-action-bar-space: calc(var(--book-action-bar-height) + env(safe-area-inset-bottom, 0px) + 14px);
}

.book-page main {
  padding-bottom: var(--book-action-bar-space);
}

.book-action-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  padding: 10px 14px calc(10px + env(safe-area-inset-bottom, 0px));
  background: oklch(0.12 0.018 50 / 0.94);
  border-top: 1px solid oklch(0.78 0.09 78 / 0.35);
  backdrop-filter: blur(6px);
}

.book-action-bar__inner {
  width: min(980px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.book-action-btn {
  flex: 1 1 auto;
  min-height: 52px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--gold);
  color: var(--ink);
  border: 1px solid oklch(0.96 0.03 90 / 0.45);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  border-radius: 4px;
}

.book-action-btn:hover {
  background: oklch(0.80 0.10 82);
}

.book-action-btn:focus-visible {
  outline: 2px solid var(--parchment);
  outline-offset: 2px;
}

.book-action-btn svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.book-action-esc-hint {
  display: none;
  color: oklch(0.92 0.012 82 / 0.86);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.book-action-esc-hint .kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  min-height: 24px;
  padding: 2px 8px;
  margin-right: 8px;
  border-radius: 3px;
  border: 1px solid oklch(0.92 0.012 82 / 0.5);
  line-height: 1;
}

@media (min-width: 768px) {
  .book-page {
    --book-action-bar-height: 64px;
  }

  .book-action-bar {
    padding-left: 20px;
    padding-right: 20px;
  }

  .book-action-btn {
    flex: 0 0 auto;
    min-width: 280px;
  }

  .book-action-esc-hint {
    display: inline-flex;
    align-items: center;
    margin-left: auto;
  }
}