.pdf-category-section {
  margin-bottom: 3rem;
}


.pdf-books-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .pdf-books-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pdf-books-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pdf-book-card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.pdf-book-card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.pdf-card-header {
  padding: 0rem 1rem;
}

.pdf-thumbnail-container {
  width: 80%;
  margin: 1.5rem auto 0rem;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: 0.25rem;
  background-color: #f3f4f6;
  border: 1px solid #e5e7eb;
}

img.pdf-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pdf-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

h3.pdf-book-title {
  font-weight: 600;
  color: #111827;
}

.pdf-version-badge {
  background-color: #f3f4f6;
  color: #374151;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.pdf-card-content {
  padding: 0 1rem 1rem;
}

.pdf-metadata-row {
  display: flex;
  justify-content: space-between;
  color: #6b7280;
  margin-bottom: 0.75rem;
}

div.pdf-button-group {
  display: flex;
  gap: 0.5rem;
}

button.pdf-download-btn, a.pdf-open-btn {
  width: 100%;
  border: 1px solid transparent;
  padding: 0.3rem 1rem;
  border-radius: 0.375rem;
  /* font-size: 0.875rem; */
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  text-decoration: none;
}

button.pdf-download-btn {
  background-color: #374151;
  color: white;
}

button.pdf-download-btn:hover {
  background-color: #4b5563;
}

a.pdf-open-btn {
    background-color: #f3f4f6;
    color: #374151;
    border: 1px solid #d1d5db;
}

a.pdf-open-btn:hover {
    background-color: #e5e7eb;
}

svg.pdf-download-icon, svg.pdf-open-icon {
  width: 0.8rem;
  height: 0.8rem;
}