/* ============================================================
   BOOKS — Glassmorphism cards with 3D tilt
   ============================================================ */

.books__heading {
  margin-top: var(--space-3);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
}

.books__subhead {
  max-width: 520px;
  margin-inline: auto;
  margin-top: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-cream-muted);
}

.section-header {
  margin-bottom: var(--space-10);
}

/* ── Books grid — stacked vertically, centered, premium width ── */
.books__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 860px;
  margin-inline: auto;
}

/* ── Book card — horizontal layout ── */
.book-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-8);
  padding: var(--space-8);
  border-radius: var(--radius-xl);
  transform-style: preserve-3d;
  transition: all var(--transition-base);
  cursor: default;
  align-items: start;
}

/* ── Book cover placeholder ── */
.book-card__cover {
  flex-shrink: 0;
}

.photo-placeholder--book {
  width: 140px;
  aspect-ratio: 2 / 3;
  border-radius: var(--radius-md);
  background: none;
  animation: none;
  background-color: var(--color-charcoal-surface);
  overflow: hidden;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
}

/* Book cover style (face-on, horizontal text — readable without tilting) */
.book-spine {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4);
  background: linear-gradient(
    160deg,
    #1e1710 0%,
    #2e2618 50%,
    #1e1710 100%
  );
  border-top: 3px solid var(--color-champagne);
  position: relative;
  overflow: hidden;
}

.book-spine::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(200, 169, 110, 0.07) 100%);
}

.book-spine--green {
  background: linear-gradient(
    160deg,
    #0e1a12 0%,
    #162314 50%,
    #0e1a12 100%
  );
  border-top-color: #6B9E6B;
}

.book-spine__title {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-champagne-light);
  text-align: center;
  line-height: 1.3;
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
}

.book-spine__author {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  color: var(--color-cream-muted);
  text-align: center;
  position: relative;
  z-index: 1;
}

/* ── Book card content ── */
.book-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0; /* prevent overflow */
}

.book-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-cream);
  line-height: var(--leading-tight);
  margin-top: var(--space-2);
}

.book-card__subtitle {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--color-champagne-light);
  margin-top: calc(-1 * var(--space-2));
}

.book-card__desc {
  font-size: var(--text-base);
  color: var(--color-cream-muted);
  line-height: var(--leading-relaxed);
  max-width: 560px;
}

.book-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.btn-sm {
  padding: var(--space-2) var(--space-6);
  font-size: var(--text-sm);
}

/* ── Tilt card interaction ── */
.tilt-card {
  transition: transform 0.15s ease, box-shadow var(--transition-base);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .book-card {
    grid-template-columns: 1fr;
    padding: var(--space-7);
  }

  .photo-placeholder--book {
    width: 140px;
  }

  .book-card__title {
    font-size: var(--text-2xl);
  }
}