.books-page .books-hero {
  background: linear-gradient(135deg, #0f3d5c 0%, #1d8a5e 55%, #145f40 100%);
}

.book-card .card-image-wrap::after {
  content: 'PDF';
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(15, 61, 92, 0.85);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 8px;
  border-radius: 6px;
}

/* ── Book detail (aligned with article detail page) ── */
.book-detail-wrap {
  max-width: 840px;
  margin: 0 auto;
  padding: calc(var(--site-header-h, 76px) + 24px) 2rem 48px;
}

.book-hero-block {
  position: relative;
  border-radius: var(--radius, 14px);
  overflow: hidden;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
  background: linear-gradient(145deg, #e8f5ef, #d4ebe2);
  width: 100%;
}

.book-hero-block img {
  width: 100%;
  aspect-ratio: 16 / 9;
  min-height: 280px;
  max-height: 520px;
  object-fit: cover;
  object-position: center center;
  display: block;
}

.book-cover-fallback {
  aspect-ratio: 16 / 9;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', serif;
  font-size: 3rem;
  color: #1d8a5e;
  font-weight: 700;
}

.book-category-pill {
  display: inline-block;
  margin-bottom: 12px;
}

.book-detail-wrap h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.6rem, 4vw, 2.35rem);
  font-weight: 700;
  margin: 0 0 1rem;
  line-height: 1.25;
  color: var(--text);
  letter-spacing: -0.3px;
}

.book-excerpt {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 1.25rem;
}

.book-meta-bar {
  margin-bottom: 2rem;
}

.book-meta-bar i {
  margin-right: 4px;
  color: var(--green, #1d8a5e);
}

.book-pdf-section {
  background: #fff;
  border: 1px solid var(--border, #e0e9f0);
  border-radius: var(--radius, 14px);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.book-pdf-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border, #e0e9f0);
  background: var(--surface-2, #f6f9fb);
}

.book-pdf-toolbar h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.book-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  white-space: nowrap;
}

.book-pdf-frame {
  width: 100%;
  min-height: 72vh;
  border: 0;
  background: #1a1a1a;
  display: block;
}

.book-pdf-mobile-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 240px;
  padding: 2rem 1.5rem;
  text-align: center;
  background: var(--surface-2, #f6f9fb);
}

.book-pdf-mobile-fallback p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 280px;
}

.book-pdf-mobile-icon {
  font-size: 2.5rem;
  color: var(--green, #1d8a5e);
}

.book-open-pdf-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.book-no-pdf {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
  background: var(--surface-2, #f6f9fb);
  border-radius: var(--radius, 14px);
  border: 1px dashed var(--border, #e0e9f0);
}

@media (max-width: 768px) {
  .book-detail-wrap {
    padding: calc(var(--site-header-h, 76px) + 12px) 0 32px;
  }

  .book-detail-wrap > :not(.book-hero-block) {
    padding-left: 16px;
    padding-right: 16px;
  }

  .book-hero-block {
    width: 100%;
    max-width: none;
    border-radius: 0;
    margin-bottom: 1.25rem;
    box-shadow: none;
  }

  .book-hero-block img,
  .book-cover-fallback {
    aspect-ratio: 16 / 10;
    min-height: 200px;
    max-height: 42vh;
  }

  .book-pdf-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .book-download-btn {
    justify-content: center;
  }

  .book-pdf-frame {
    min-height: 0;
  }
}