/* ==========================================================================
   KOUKE Product Detail Page Styles
   ========================================================================== */

/* Hero Section */
.page-hero {
  padding: var(--space-xl) 0;
  background: #F9F9FA;
  position: relative;
}

.page-hero-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.page-hero-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
}

.page-hero-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin: 0;
  line-height: var(--line-height-tight);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.3s ease;
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb i {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

/* Product Detail Section */
.product-detail-section {
  padding: var(--space-2xl) 0;
  background-color: #FFFFFF;
}

.product-detail-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

/* ==========================================================================
   Product Images (Left)
   ========================================================================== */
.product-detail-section .product-images {
  position: sticky;
  top: 100px;
}

.product-images-wrapper {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

/* Thumbnail Column */
.thumbnail-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  width: 100px;
  flex-shrink: 0;
}

.thumbnail-list-vertical {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 480px;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.thumbnail-list-vertical::-webkit-scrollbar {
  display: none;
}

.thumbnail-item {
  width: 100px;
  height: 100px;
  background-color: #F5F5F5;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  border: 3px solid transparent;
  transition: var(--transition-base);
  flex-shrink: 0;
}

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

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

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

/* Thumbnail Arrows */
.thumbnail-arrow {
  width: 100%;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #FFFFFF;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: var(--transition-base);
}

.thumbnail-arrow:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.thumbnail-arrow:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  background-color: #FFFFFF;
  color: var(--color-primary);
}

/* Main Image */
.main-image {
  flex: 1;
  width: 100%;
  aspect-ratio: 1;
  background-color: #F5F5F5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.main-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.22s ease, transform 0.22s ease;
  opacity: 1;
  transform: scale(1);
  will-change: opacity, transform;
}

.main-image img.is-switching {
  opacity: 0.4;
  transform: scale(0.985);
}

/* ==========================================================================
   Product Info (Right)
   ========================================================================== */
.product-detail-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.product-detail-category-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-primary-alpha);
  border-radius: var(--radius-sm);
}

.product-detail-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: var(--line-height-tight);
  margin: 0;
}

.product-detail-short-desc {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* Product Features */
.product-detail-features {
  padding: var(--space-xl);
  background-color: var(--color-primary-alpha);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-primary);
}

.product-detail-features-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin: 0 0 var(--space-md) 0;
}

.product-detail-features-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.product-detail-features-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--text-base);
  color: var(--color-text-main);
  line-height: var(--line-height-base);
}

.product-detail-features-list i {
  color: var(--color-success);
  font-size: var(--text-base);
  margin-top: 4px;
  flex-shrink: 0;
}

/* Inquiry Button */
.inquiry-btn {
  width: 100%;
  justify-content: center;
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--text-lg);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Certificates */
.product-detail-certificates {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.product-detail-certificates-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  margin: 0 0 var(--space-md) 0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.product-detail-certificates-list {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.product-detail-certificate-item {
  width: 80px;
  height: 80px;
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

.product-detail-certificate-item img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* ==========================================================================
   Product Tabs Section
   ========================================================================== */
.product-tabs-section {
  padding: var(--space-2xl) 0;
  background-color: var(--color-bg-body);
}

.product-tabs-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Tab Navigation */
.tabs-nav {
  display: flex;
  gap: var(--space-md);
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-family-base);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  background-color: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
  bottom: -2px;
}

.tab-btn:hover {
  color: var(--color-primary);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Tab Content */
.tabs-content {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-sm);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.tab-content-text {
  font-size: var(--text-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-muted);
}

.tab-content-text h2 {
  font-family: var(--font-family-heading);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-primary);
  line-height: var(--line-height-tight);
}

.tab-content-text h2:first-child {
  margin-top: 0;
}

.tab-content-text h3 {
  font-family: var(--font-family-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-tight);
}

.tab-content-text h4 {
  font-family: var(--font-family-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.tab-content-text p {
  margin-bottom: var(--space-lg);
  line-height: var(--line-height-relaxed);
}

.tab-content-text p:last-child {
  margin-bottom: 0;
}

.tab-content-text ul,
.tab-content-text ol {
  margin: var(--space-lg) 0;
  padding-left: var(--space-2xl);
  line-height: var(--line-height-relaxed);
}

.tab-content-text ul li,
.tab-content-text ol li {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-xs);
}

.tab-content-text ul li:last-child,
.tab-content-text ol li:last-child {
  margin-bottom: 0;
}

.tab-content-text strong {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
}

.tab-content-text img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--space-2xl) 0;
  box-shadow: var(--shadow-md);
  display: block;
}

.tab-content-text table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-2xl) 0;
  font-size: var(--text-base);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tab-content-text table th,
.tab-content-text table td {
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border);
  text-align: left;
  line-height: var(--line-height-base);
}

.tab-content-text table th {
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-base);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tab-content-text table tbody tr {
  transition: background-color 0.2s ease;
}

.tab-content-text table tbody tr:nth-child(even) {
  background-color: var(--color-bg-body);
}

.tab-content-text table tbody tr:hover {
  background-color: var(--color-primary-alpha);
}

.tab-content-text blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-primary-alpha);
  border-radius: var(--radius-md);
  font-style: italic;
  color: var(--color-text-muted);
}

.tab-content-text a {
  color: var(--color-primary);
  text-decoration: underline;
  transition: var(--transition-base);
}

.tab-content-text a:hover {
  color: var(--color-primary-hover);
}

/* ==========================================================================
   Related Products Section
   ========================================================================== */
.related-products-section {
  padding: var(--space-2xl) 0;
  background-color: #FFFFFF;
}

.related-products-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.related-products-title {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-family-heading);
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2xl);
  text-align: center;
  justify-content: center;
}

.related-products-title i {
  color: var(--color-primary);
  font-size: var(--text-2xl);
}

.related-products-slider-wrapper {
  position: relative;
  padding: 0 60px;
}

.related-products-slider {
  display: flex;
  gap: var(--space-lg);
  overflow-x: hidden;
  overflow-y: visible;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.related-products-slider::-webkit-scrollbar {
  display: none;
}

.related-products-section .product-card {
  scroll-snap-align: start;
  flex: 0 0 calc((100% - 72px) / 4);
  min-width: 250px;
  background: transparent;
  border-radius: 0;
  overflow: visible;
  box-shadow: none;
  transition: var(--transition-base);
  border: none;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  gap: var(--space-sm);
  cursor: pointer;
}

.related-products-section .product-card:hover {
  transform: none;
  box-shadow: none;
}

/* Product Images */
.related-products-section .product-images {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  background: #F5F5F5;
  border-radius: var(--radius-lg);
}

.related-products-section .product-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.5s ease;
}

.related-products-section .product-image-main {
  opacity: 1;
  z-index: 1;
}

.related-products-section .product-image-hover {
  opacity: 0;
  z-index: 2;
}

.related-products-section .product-card:hover .product-image-main {
  opacity: 0;
}

.related-products-section .product-card:hover .product-image-hover {
  opacity: 1;
}

/* Product Badge */
.related-products-section .product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  z-index: 10;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.related-products-section .badge-hot {
  background: #E74C3C;
}

.related-products-section .badge-new {
  background: #6DB06D;
}

/* Product View Button */
.related-products-section .product-view-btn {
  position: absolute;
  bottom: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #FFFFFF;
  border-radius: 50%;
  flex-shrink: 0;
  transition: all 0.3s ease;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(83, 129, 176, 0.3);
  border: none;
  cursor: pointer;
  opacity: 1;
  transform: scale(1);
}

.related-products-section .product-card:hover .product-view-btn {
  background: var(--color-primary-hover);
  transform: scale(1.05);
  box-shadow: 0 6px 16px rgba(83, 129, 176, 0.4);
}

.related-products-section .product-view-btn i {
  font-size: 18px;
}

/* Product Info */
.related-products-section .product-info {
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.related-products-section .product-category {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.related-products-section .product-footer {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.related-products-section .product-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-main);
  margin-bottom: 0;
  line-height: var(--line-height-tight);
  flex: 1;
}

/* Slider Buttons */
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #FFFFFF;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  color: var(--color-primary);
  font-size: var(--text-xl);
  cursor: pointer;
  transition: var(--transition-base);
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.slider-btn:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-50%) scale(1.1);
}

.slider-btn-prev {
  left: 0;
}

.slider-btn-next {
  right: 0;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet */
@media (max-width: 1024px) {
  .product-detail-container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  /* Remove sticky positioning on tablet */
  .product-detail-section .product-images {
    position: static;
  }
  
  .product-images-wrapper {
    flex-direction: column;
  }
  
  .thumbnail-column {
    flex-direction: row;
    width: 100%;
    order: 2;
  }
  
  .thumbnail-list-vertical {
    flex-direction: row;
    max-height: none;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }
  
  .thumbnail-arrow {
    display: none;
  }
  
  .main-image {
    order: 1;
    margin-bottom: var(--space-md);
  }
  
  .product-detail-title {
    font-size: var(--text-3xl);
  }
  
  .product-detail-features {
    padding: var(--space-lg);
  }
  
  .related-products-section .product-card {
    flex: 0 0 calc((100% - 48px) / 3);
  }
  
  .slider-btn {
    width: 45px;
    height: 45px;
    font-size: var(--text-lg);
  }
}

/* Mobile */
@media (max-width: 768px) {
  .page-hero {
    padding: var(--space-md) 0;
  }
  
  .page-hero-content {
    padding: 0 var(--space-md);
  }
  
  .page-hero-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }
  
  .page-hero-title {
    font-size: var(--text-2xl);
  }
  
  .breadcrumb {
    font-size: var(--text-xs);
    flex-wrap: wrap;
  }
  
  .product-detail-section,
  .product-tabs-section,
  .related-products-section {
    padding: var(--space-xl) 0;
  }
  
  .product-detail-container,
  .product-tabs-container,
  .related-products-container {
    padding: 0 var(--space-md);
  }
  
  .product-detail-title {
    font-size: var(--text-2xl);
  }
  
  .product-detail-short-desc {
    font-size: var(--text-base);
  }
  
  .product-detail-features {
    padding: var(--space-md);
  }
  
  .product-detail-features-title {
    font-size: var(--text-lg);
  }
  
  .inquiry-btn {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
  }
  
  .product-detail-certificates-list {
    justify-content: flex-start;
  }
  
  .product-detail-certificate-item {
    width: 60px;
    height: 60px;
  }
  
  .thumbnail-column {
    gap: var(--space-xs);
  }
  
  .thumbnail-item {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
  }
  
  .tabs-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    margin-bottom: var(--space-lg);
  }
  
  .tab-btn {
    white-space: nowrap;
    font-size: var(--text-base);
    padding: var(--space-sm) var(--space-lg);
  }
  
  .tabs-content {
    padding: var(--space-xl);
  }
  
  .tab-content-text {
    font-size: var(--text-sm);
  }
  
  .tab-content-text h2 {
    font-size: var(--text-xl);
    margin-top: var(--space-xl);
  }
  
  .tab-content-text h3 {
    font-size: var(--text-lg);
  }
  
  .tab-content-text table {
    font-size: var(--text-sm);
  }
  
  .tab-content-text table th,
  .tab-content-text table td {
    padding: var(--space-sm) var(--space-md);
  }
  
  .related-products-slider-wrapper {
    padding: 0;
  }
  
  .related-products-slider {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 var(--space-md);
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .related-products-slider::-webkit-scrollbar {
    display: none;
  }
  
  .related-products-section .product-card {
    flex: 0 0 calc((100% - 32px) / 2);
    scroll-snap-align: center;
  }
  
  .slider-btn {
    display: none;
  }
  
  .related-products-title {
    font-size: var(--text-2xl);
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .page-hero {
    padding: var(--space-sm) 0;
  }
  
  .page-hero-content {
    padding: 0 var(--space-sm);
  }
  
  .page-hero-title {
    font-size: var(--text-xl);
  }
  
  .breadcrumb {
    font-size: 11px;
  }
  
  .product-detail-section,
  .product-tabs-section,
  .related-products-section {
    padding: var(--space-lg) 0;
  }
  
  .product-detail-container,
  .product-tabs-container,
  .related-products-container {
    padding: 0 var(--space-sm);
  }
  
  .product-detail-title {
    font-size: var(--text-xl);
  }
  
  .product-detail-short-desc {
    font-size: var(--text-sm);
  }
  
  .product-detail-features {
    padding: var(--space-md);
  }
  
  .product-detail-features-title {
    font-size: var(--text-base);
  }
  
  .product-detail-features-list {
    font-size: var(--text-sm);
  }
  
  .inquiry-btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--text-sm);
  }
  
  .product-detail-certificates-list {
    justify-content: center;
  }
  
  .product-detail-certificate-item {
    width: 50px;
    height: 50px;
  }
  
  .thumbnail-item {
    width: 70px;
    height: 70px;
  }
  
  .main-image {
    border-radius: var(--radius-md);
  }
  
  .tabs-nav {
    gap: var(--space-xs);
  }
  
  .tab-btn {
    font-size: var(--text-sm);
    padding: var(--space-xs) var(--space-md);
  }
  
  .tabs-content {
    padding: var(--space-lg);
  }
  
  .tab-content-text {
    font-size: var(--text-xs);
  }
  
  .tab-content-text h2 {
    font-size: var(--text-lg);
  }
  
  .tab-content-text h3 {
    font-size: var(--text-base);
  }
  
  .related-products-title {
    font-size: var(--text-xl);
    gap: var(--space-sm);
  }
  
  .related-products-title i {
    font-size: var(--text-lg);
  }
  
  .related-products-section .product-card {
    flex: 0 0 calc(100% - 32px);
    min-width: auto;
  }
  
  .related-products-section .product-images {
    height: auto;
  }
  
  .related-products-section .product-badge {
    top: 8px;
    left: 8px;
    padding: 3px 8px;
    font-size: 10px;
  }
  
  .related-products-section .product-view-btn {
    width: 40px;
    height: 40px;
    bottom: 8px;
    right: 8px;
  }
  
  .related-products-section .product-view-btn i {
    font-size: 16px;
  }
  
  .related-products-section .product-title {
    font-size: var(--text-sm);
  }
}