/* ═══════════════════════════════════════════
   OVERLAY — book detail modal with the literal
   "book opens" animation on the left pane.
   ═══════════════════════════════════════════ */

.book-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
  visibility: hidden;
  pointer-events: none;
}
.book-overlay.is-open {
  visibility: visible;
  pointer-events: auto;
}

.bo-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 8, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 0.35s ease;
}
.book-overlay.is-open .bo-backdrop {
  opacity: 1;
}

.bo-sheet {
  position: relative;
  width: min(980px, 100%);
  max-height: min(86svh, 780px);
  overflow-y: auto;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--bg-0);
  box-shadow: var(--shadow-lift);
  padding: clamp(26px, 4vw, 56px);
  transform: translateY(46px) scale(0.98);
  opacity: 0;
  filter: blur(12px);
  transition: transform 0.45s var(--ease-spring), opacity 0.35s ease, filter 0.4s ease;
}
.book-overlay.is-open .bo-sheet {
  transform: none;
  opacity: 1;
  filter: blur(0);
}

.bo-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-1);
  color: var(--ink-1);
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease, transform 0.25s var(--ease-out);
  z-index: 2;
}
.bo-close .icon { width: 15px; height: 15px; }
/* the cross draws itself as the modal opens */
.bo-close .icon path {
  stroke-dasharray: 44;
  stroke-dashoffset: 44;
  transition: stroke-dashoffset 0.5s var(--ease-out) 0.25s;
}
.book-overlay.is-open .bo-close .icon path { stroke-dashoffset: 0; }
.bo-close:hover {
  border-color: color-mix(in srgb, var(--accent-2) 55%, var(--line));
  color: var(--accent-2);
  transform: rotate(90deg);
}

.bo-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(26px, 4vw, 56px);
  align-items: center;
}
@media (max-width: 760px) {
  .bo-grid { grid-template-columns: 1fr; }
}

/* ── the opening book ── */
.bm-stage {
  perspective: 1600px;
  display: grid;
  place-items: center;
  padding: 20px 0;
}
.bm-book {
  position: relative;
  width: min(240px, 60vw);
  aspect-ratio: 5 / 7;
  transform-style: preserve-3d;
}
.bm-page {
  position: absolute;
  inset: 0;
  border-radius: 6px 12px 12px 6px;
  background:
    linear-gradient(90deg, rgba(0, 0, 0, 0.14), transparent 12%),
    repeating-linear-gradient(180deg, #f4efe4 0 28px, #ece6d8 28px 29px);
  border: 1px solid #d8d2c4;
  display: grid;
  place-items: center;
  padding: 22px;
}
.bm-page-text {
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.5;
  color: #4a4438;
  text-align: center;
  margin: 0;
}
.bm-cover {
  position: absolute;
  inset: 0;
  transform-origin: left center;
  transform-style: preserve-3d;
  border-radius: 6px 12px 12px 6px;
  box-shadow: 8px 12px 34px rgba(0, 0, 0, 0.4);
}
.bm-cover-art {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: inherit;
  backface-visibility: hidden;
  background: radial-gradient(120% 120% at 30% 20%, var(--art-tint-soft), var(--art-tint) 70%);
}
.bm-cover-art[data-tint='violet'] { --art-tint: #2a1a52; --art-tint-soft: #4c2f8f; }
.bm-cover-art[data-tint='crimson'] { --art-tint: #3a1414; --art-tint-soft: #7a2020; }
.bm-cover-art[data-tint='plum'] { --art-tint: #2d1436; --art-tint-soft: #6b2a7a; }
.bm-cover-art[data-tint='graphite'] { --art-tint: #17171d; --art-tint-soft: #3c3c49; }
.bm-cover-glyph {
  color: rgba(255, 255, 255, 0.92);
  filter: drop-shadow(0 0 26px rgba(255, 255, 255, 0.28));
}
.bm-cover-glyph .icon { width: clamp(52px, 11vw, 78px); height: clamp(52px, 11vw, 78px); stroke-width: 2.2; }
.bm-cover-back {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, #23232b, #101014);
  transform: rotateY(180deg);
  backface-visibility: hidden;
}
.bm-cover.is-opening {
  animation: bookOpen 1s 0.18s var(--ease-spring) forwards;
}
@keyframes bookOpen {
  to { transform: rotateY(-148deg); }
}

/* ── copy pane ── */
.bo-kicker {
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.68rem;
  margin-bottom: 14px;
}
.bo-title {
  margin-bottom: 6px;
}
.bo-author {
  color: var(--ink-2);
  font-size: 0.78rem;
  margin-bottom: 18px;
}
.bo-oneliner {
  font-size: 1.25rem;
  color: var(--ink-0);
  margin-bottom: 22px;
}
.bo-copy .hairline {
  margin-bottom: 22px;
}
.bo-why-label {
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--ink-2);
  margin-bottom: 10px;
}
.bo-why {
  color: var(--ink-1);
  font-size: 1.02rem;
  line-height: 1.75;
  margin: 0;
}

/* status + stack chips + repo link */
.bo-status-line {
  color: var(--accent);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
}
.bo-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 22px;
}
.bo-stack span {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.05em;
  padding: 4px 11px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.bo-repo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-0);
  transition: border-color 0.25s ease, color 0.25s ease, transform 0.25s var(--ease-out);
}
.bo-repo .icon { width: 14px; height: 14px; }
.bo-repo:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); color: var(--accent); transform: translateY(-2px); }

@media (prefers-reduced-motion: reduce) {
  .bo-sheet {
    transition: opacity 0.2s ease;
    transform: none;
  }
  .bm-cover.is-opening {
    animation: none;
    transform: rotateY(-148deg);
  }
}