:root {
  --color-primary-button-bg: hsl(var(--color-primary-hs), 40%);
  --color-primary-button-text: white;
  --color-primary-button-hover-bg: var(--color-primary-dark);
  --color-primary-button-hover-text: white;

  --color-quantity-btn-bg: var(--color-card-bg);
  --color-quantity-btn-text: #000000;
  --color-quantity-btn-hover-bg: #e0e0e0;
  --color-quantity-btn-hover-text: #000000;

  --color-quantity-input-bg: var(--color-card-bg);
  --color-quantity-input-text: #000000;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary-button-bg: white;
    --color-primary-button-text: var(--color-primary-dark);
    --color-primary-button-hover-bg: var(--color-primary-dark);
    --color-primary-button-hover-text: var(--color-secondary);
    
    --color-quantity-btn-bg: #e0e0e0;
    --color-quantity-btn-hover-bg: var(--color-primary);
}


.book-details {
  padding: 40px 0;
  background-color: var(--color-background);
}

.book-details-grid {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 40px;
}

.book-images {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.book-main-image {
  position: relative;
  width: 100%;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-normal);
}

.book-main-image img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-md);
}

.favorite-btn-large {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  background-color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  font-size: 24px;
  color: var(--color-text-light);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition-normal);
}

.favorite-btn-large:hover,
.favorite-btn-large:focus {
  background-color: #ffe0e0;
  color: #ff4d4d;
  transform: scale(1.1);
}

.book-thumbnails {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.thumbnail {
  width: 80px;
  height: 120px;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  padding: 0;
  background: none;
  transition: var(--transition-normal);
}

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

.thumbnail:hover {
  transform: translateY(-2px);
}

.thumbnail.active {
  border-color: var(--color-primary);
}

.book-info-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.book-header {
  margin-bottom: 20px;
}

.book-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.3;
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 8px;
}

.book-author {
  font-size: var(--font-size-md);
  color: var(--color-text-light);
}

.book-author a {
  color: var(--color-primary);
  font-weight: 500;
}

.book-author a:hover {
  text-decoration: underline;
}

.book-rating {
  display: flex;
  align-items: center;
  gap: 8px;
}

.stars {
  display: flex;
  color: #ffd700;
}

.star {
  margin-right: 2px;
}

.star.filled {
  color: #ffd700;
}

.star.half {
  position: relative;
  color: #e0e0e0;
}

.star.half::before {
  content: "★";
  position: absolute;
  color: #ffd700;
  width: 50%;
  overflow: hidden;
}

.rating-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.book-pricing {
  background-color: var(--color-card-bg);
  padding: 16px;
  border-radius: var(--border-radius-md);
  margin-bottom: 20px;
}

.price-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}

.current-price {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
}

.tax-info {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.book-description {
  margin-bottom: 24px;
}

.book-description h2 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: 12px;
}

.book-description p {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 12px;
}

.show-more {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: 0;
}

.show-more:hover {
  text-decoration: underline;
}

.book-details-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  font-size: var(--font-size-sm);
}

.details-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.detail-label {
  color: var(--color-text-light);
  font-weight: 400;
}

.detail-value {
  color: var(--color-text);
  font-weight: 500;
}

.book-purchase {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.purchase-card {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--shadow-normal);
}

.purchase-card h2 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text);
}

.quantity-selector {
  margin-bottom: 24px;
}

.quantity-selector h3 {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--color-text);
}

.option-text {
  display: flex;
  justify-content: space-between;
  width: 100%;
}

.option-title {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.option-price {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
}

.quantity-control {
  display: flex;
  align-items: center;
  border: 1px solid #e0e0e0;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  width: fit-content;
}

.quantity-btn {
  width: 36px;
  height: 36px;
  background-color: var(--color-quantity-btn-bg);
  color: var(--color-quantity-btn-text);
  border: none;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-normal);
}

.quantity-btn:hover {
  background-color: var(--color-quantity-btn-hover-bg);
  color: var(--color-quantity-btn-hover-text);
}

.quantity-input {
  width: 50px;
  height: 36px;
  border: none;
  text-align: center;
  font-size: var(--font-size-md);
  background-color: var(--color-quantity-input-hover-bg);
  color: var(--color-quantity-input-hover-text);
  -moz-appearance: textfield; /* Firefox */
}

.quantity-input::-webkit-outer-spin-button,
.quantity-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.purchase-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.primary-button {
  padding: 12px 16px;
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.primary-button {
  background-color: var(--color-primary-button-bg);
  color: var(--color-primary-button-text);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-button:hover {
  background-color: var(--color-primary-button-hover-bg);
  color: var(--color-primary-button-hover-text);
}

.icon {
  font-size: 18px;
}

.delivery-info {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--shadow-normal);
}

.delivery-info h3 {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.delivery-option {
  display: flex;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.delivery-option:last-child {
  border-bottom: none;
}

.delivery-icon {
  font-size: 24px;
  color: var(--color-primary);
}

.delivery-details {
  flex: 1;
}

.delivery-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--color-text);
}

.delivery-description,
.delivery-price {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-bottom: 2px;
}

.book-reviews {
  padding: 60px 0;
  background-color: #f9f9fb;
}

.reviews-summary {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
  align-items: center;
}

.overall-rating {
  text-align: center;
}

.rating-number {
  font-size: 48px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1;
  margin-bottom: 8px;
}

.review-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-top: 8px;
}

.rating-breakdown {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 10px;
}

.rating-label {
  width: 80px;
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.progress-bar {
  flex: 1;
  height: 8px;
  background-color: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
}

.progress {
  height: 100%;
  background-color: #ffd700;
}

.rating-percent {
  width: 40px;
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  text-align: right;
}

.add-review {
  text-align: center;
}

.review-btn {
  display: inline-block;
}

.review-filters {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 24px;
}

.filter-select {
  padding: 8px 16px;
  border: 1px solid #e0e0e0;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  cursor: pointer;
}

.reviews-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 40px;
}

.review-card {
  background-color: white;
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--shadow-normal);
}

.review-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}

.reviewer-info {
  display: flex;
  align-items: center;
  gap: 16px;
}

.reviewer-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  overflow: hidden;
}

.reviewer-name {
  font-size: var(--font-size-md);
  font-weight: 500;
  margin-bottom: 4px;
  color: var(--color-text);
}

.review-stars {
  display: flex;
}

.review-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.review-title {
  font-size: var(--font-size-md);
  font-weight: 500;
  margin-bottom: 12px;
  color: var(--color-text);
}

.review-content {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.6;
  margin-bottom: 16px;
}

.review-content p:not(:last-child) {
  margin-bottom: 12px;
}

.review-footer {
  display: flex;
  justify-content: flex-end;
}

.review-helpful {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
}

.helpful-btn {
  background: none;
  border: 1px solid #e0e0e0;
  padding: 4px 12px;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: var(--transition-normal);
}

.helpful-btn:hover {
  background-color: var(--color-card-bg);
}

.see-more-reviews {
  text-align: center;
}

.load-more {
  padding: 12px 24px;
}

.related-books {
  padding: 60px 0;
}

.related-books .products-grid {
  grid-template-columns: repeat(4, 1fr);
}

.product-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product-author {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.discount {
  text-decoration: line-through;
  color: var(--color-text-light);
  font-size: var(--font-size-xs);
  margin-left: 6px;
}

@media screen and (max-width: 1024px) {
  .book-details-grid {
    grid-template-columns: 1fr 2fr;
  }

  .book-purchase {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .reviews-summary {
    grid-template-columns: 1fr 2fr;
    gap: 30px;
  }

  .add-review {
    grid-column: span 2;
    margin-top: 20px;
  }

  .related-books .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media screen and (max-width: 768px) {
  .book-details-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .book-purchase {
    grid-column: auto;
    grid-template-columns: 1fr;
  }

  .reviews-summary {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .overall-rating,
  .rating-breakdown,
  .add-review {
    grid-column: auto;
  }

  .related-books .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .book-images {
    max-width: 400px;
    margin: 0 auto;
  }

  .book-main-image {
    height: auto;
  }
}

@media screen and (max-width: 480px) {
  .book-title {
    font-size: var(--font-size-lg);
  }

  .book-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .review-header {
    flex-direction: column;
    gap: 10px;
  }

  .related-books .products-grid {
    grid-template-columns: 1fr;
  }

  .review-helpful {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .book-details-meta {
    grid-template-columns: 1fr;
  }

  .book-main-image {
    max-width: 90vw;
  }

  .thumbnail {
    width: 20vw;
    height: 30vw;
    max-width: 60px;
    max-height: 90px;
  }

  .primary-button {
    padding: 3vw 4vw;
  }

  .book-reviews,
  .related-books {
    padding: 8vh 0;
  }

  .review-card {
    padding: 5vw;
  }
}
}