:root {
  --color-primary: #0078C8;
  --color-primary-dark: #005A9C;
  --color-accent: #C0C0C0;
  --color-accent-dark-blue: #005A9C;
  --color-text-1: #333333;
  --color-text-2: #666666;
  --color-bg-white: #ffffff;
  --color-bg-light-gray: #F5F5F5;
  --color-border-light: #E0E0E0;
  --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.12);
  --border-radius: 4px;
  --transition: all 0.3s ease;
}

.category-nav {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
}

.category-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
}

.category-nav-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  cursor: pointer;
  padding: 4px;
}

.sidebar-toggle i {
  font-size: 24px;
  color: var(--color-white);
}

.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.category-item {
  border-bottom: 1px solid var(--color-border-light);
}

.category-item:last-child {
  border-bottom: none;
}

.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  text-decoration: none;
  color: var(--color-text-1);
  transition: var(--transition);
  position: relative;
  cursor: pointer;
}

.category-link:hover {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
}

.category-text {
  flex: 1;
}

.category-arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--color-text-2);
}

.category-item.expanded .category-arrow {
  transform: rotate(180deg);
}

.category-item.expanded .category-arrow {
  color: var(--color-primary);
}

.category-link.active {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
  font-weight: 600;
}

.category-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--color-primary);
}

.category-icon {
  width: 20px;
  height: 20px;
  margin-right: 12px;
  color: var(--color-primary);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-icon i {
  font-size: 20px;
  color: var(--color-primary);
}

.category-name {
  flex: 1;
}

.category-count {
  background-color: var(--color-bg-light-gray);
  color: var(--color-text-2);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.subcategory-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: var(--color-bg-light-gray);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.category-item.expanded .subcategory-list {
  max-height: 1000px;
}

@media (min-width: 993px) {
  .product-categories .category-item {
    position: relative;
  }

  .product-categories .category-item > .category-link {
    cursor: pointer;
  }

  .product-categories .category-item.expanded .subcategory-list {
    max-height: 1000px;
  }

  .product-categories .category-item:not(.expanded) .subcategory-list {
    max-height: 0;
  }
}

.subcategory-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.subcategory-list li:last-child {
  border-bottom: none;
}

.subcategory-list a {
  display: block;
  padding: 12px 24px 12px 56px;
  text-decoration: none;
  color: var(--color-text-2);
  font-size: 0.875rem;
  transition: var(--transition);
}

.subcategory-list a:hover {
  color: var(--color-primary);
  background-color: rgba(0, 102, 204, 0.05);
}

.subcategory-list a.active {
  color: var(--color-primary);
  font-weight: 600;
  background-color: rgba(0, 102, 204, 0.1);
}

.products-content {
  min-height: 600px;
}

.products-header {
  margin-bottom: 32px;
}

.products-controls {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
}

.view-toggle {
  display: flex;
  gap: 8px;
}

.view-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-bg-light-gray);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text-2);
}

.view-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.view-btn.active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary-dark);
}

.view-btn i {
  font-size: 20px;
  color: var(--color-primary);
}

.sort-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-control label {
  font-size: 0.875rem;
  color: var(--color-text-2);
}

.sort-control select {
  padding: 10px 16px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-white);
  color: var(--color-text-1);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
}

.sort-control select:hover {
  border-color: var(--color-primary);
}

.sort-control select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.categories-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.category-overview-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.category-overview-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.category-overview-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.category-overview-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.category-overview-card:hover .category-overview-image img {
  transform: scale(1.05);
}

.category-overview-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.category-overview-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin-bottom: 12px;
}

.category-overview-content > p {
  font-size: 0.9375rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.category-overview-features {
  list-style: none;
  margin: 0 0 20px 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.category-overview-features li {
  background-color: var(--color-bg-light-gray);
  color: var(--color-text-2);
  font-size: 0.8125rem;
  padding: 6px 14px;
  border-radius: 16px;
  font-weight: 500;
}

.category-overview-content .btn {
  align-self: flex-start;
}

.products-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 48px 24px;
}

.products-sidebar {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  padding: 0;
  position: sticky;
  top: 80px;
  height: fit-content;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: 0;
}

.sidebar-section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-white);
  margin: 0;
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-dark-blue) 100%);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.product-categories {
  list-style: none;
  margin: 0;
  padding: 0;
}

.product-categories .category-item {
  border-bottom: 1px solid var(--color-border-light);
}

.product-categories .category-item:last-child {
  border-bottom: none;
}

.product-categories .category-link {
  display: flex;
  align-items: center;
  padding: 16px 24px;
  text-decoration: none;
  color: var(--color-text-1);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
}

.product-categories .category-link:hover {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
}

.product-categories .category-item.active .category-link {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
}

.product-categories .subcategory-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background-color: var(--color-bg-light-gray);
}

.product-categories .subcategory-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.product-categories .subcategory-list li:last-child {
  border-bottom: none;
}

.product-categories .subcategory-list a {
  display: block;
  padding: 12px 24px 12px 40px;
  text-decoration: none;
  color: var(--color-text-2);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.product-categories .subcategory-list a:hover {
  color: var(--color-primary);
  padding-left: 48px;
}

.product-categories .subcategory-list a.active {
  color: var(--color-primary);
  font-weight: 600;
  background-color: rgba(0, 120, 200, 0.1);
}

.subcategory-filter {
  list-style: none;
  margin: 0;
  padding: 0;
}

.subcategory-filter li {
  margin-bottom: 8px;
}

.subcategory-filter li:last-child {
  margin-bottom: 0;
}

.subcategory-filter-link {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--color-text-2);
  font-size: 0.9375rem;
  border-radius: 6px;
  transition: var(--transition);
}

.subcategory-filter-link:hover {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
}

.subcategory-filter-link.active {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 500;
}

.quick-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.quick-links li {
  margin-bottom: 8px;
}

.quick-links li:last-child {
  margin-bottom: 0;
}

.quick-links a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--color-text-2);
  font-size: 0.9375rem;
  border-radius: 6px;
  transition: var(--transition);
}

.quick-links a:hover {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
}

.products-main {
  min-height: 600px;
}

.products-info {
  margin-bottom: 24px;
  padding: 16px;
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
}

.products-count {
  font-size: 0.9375rem;
  color: var(--color-text-2);
}

.products-count strong {
  color: var(--color-text-1);
  font-weight: 600;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.products-grid.list-view {
  grid-template-columns: 1fr;
}

.product-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.product-card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1/1;
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.product-card:hover .product-card-image img {
  transform: scale(1.05);
}

.product-card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background-color: var(--color-accent);
  color: var(--color-white);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.product-card-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card-category {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.product-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 12px;
  line-height: 1.4;
}

.product-card-description {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.product-card-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.product-spec-tag {
  background-color: var(--color-bg-light-gray);
  color: var(--color-text-2);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
}

.product-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
}

.product-card-price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.product-card-actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.products-grid.list-view .product-card {
  flex-direction: row;
  align-items: stretch;
}

.products-grid.list-view .product-card-image {
  width: 280px;
  aspect-ratio: auto;
  flex-shrink: 0;
}

.products-grid.list-view .product-card-content {
  padding: 24px;
}

.products-grid.list-view .product-card-footer {
  margin-top: auto;
}

.subcategory-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.subcategory-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.subcategory-card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.subcategory-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.subcategory-card:hover .subcategory-card-image img {
  transform: scale(1.05);
}

.subcategory-card-content {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.subcategory-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 12px;
  line-height: 1.4;
}

.subcategory-card-description {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.subcategory-card-content .btn {
  align-self: flex-start;
  margin-top: auto;
}

.customization-section {
  padding: 48px 0;
  background-color: var(--color-bg-white);
}

.customization-section .section-header {
  text-align: center;
  margin-bottom: 48px;
}

.customization-section .section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin-bottom: 16px;
}

.customization-section .section-header p {
  font-size: 1.125rem;
  color: var(--color-text-2);
  max-width: 700px;
  margin: 0 auto;
}

.customization-intro {
  text-align: center;
  max-width: 900px;
  margin: 0 auto 48px auto;
}

.customization-intro p {
  font-size: 1rem;
  color: var(--color-text-2);
  line-height: 1.8;
}

.customization-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.customization-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  padding: 32px 24px;
  transition: var(--transition);
}

.customization-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.customization-card-icon {
  width: 64px;
  height: 64px;
  background-color: rgba(0, 120, 200, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.customization-card-icon i {
  font-size: 32px;
  color: var(--color-primary);
}

.customization-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 12px;
}

.customization-card p {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
}

.related-products-section {
  padding: 48px 0;
  background-color: var(--color-bg-white);
}

.related-products-section .section-header {
  text-align: center;
  margin-bottom: 48px;
}

.related-products-section .section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin-bottom: 12px;
}

.related-products-section .section-header p {
  font-size: 1.125rem;
  color: var(--color-text-2);
}

.related-products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.related-product-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
}

.related-product-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.related-product-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1/1;
}

.related-product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.related-product-card:hover .related-product-image img {
  transform: scale(1.05);
}

.related-product-info {
  padding: 20px;
}

.related-product-category {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.related-product-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 8px;
}

.related-product-info > p {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.5;
  margin-bottom: 12px;
}

.related-product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.related-product-specs .spec-tag {
  background-color: var(--color-bg-light-gray);
  color: var(--color-text-2);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
}

@media (max-width: 1200px) {
  .applications-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .patterns-grid {
    grid-template-columns: 1fr;
  }

  .coating-grid {
    grid-template-columns: 1fr;
  }

  .coating-card {
    flex-direction: column;
  }

  .coating-card-image {
    flex: 0 0 auto;
    min-height: 200px;
  }

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

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

@media (max-width: 992px) {
  .color-options-content {
    grid-template-columns: 1fr;
  }

  .color-palette {
    order: -1;
  }
}

@media (max-width: 768px) {
  .customization-section,
  .related-products-section {
    padding: 48px 0;
  }

  .customization-section .section-header h2,
  .related-products-section .section-header h2 {
    font-size: 1.75rem;
  }

  .customization-section .section-header p {
    font-size: 1rem;
  }

  .customization-grid {
    grid-template-columns: 1fr;
  }

  .color-swatch-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 480px) {
  .color-swatch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.cta-buttons .btn-outline {
  border-color: var(--color-white);
  color: var(--color-white);
}

.cta-buttons .btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark-blue);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

@media (max-width: 1200px) {
  .categories-overview {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 992px) {
  .categories-overview {
    grid-template-columns: 1fr;
  }

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

  .products-sidebar {
    position: relative;
    top: 0;
    max-height: none;
  }

  .category-nav-header {
    cursor: pointer;
  }

  .sidebar-toggle {
    display: block;
  }

  .category-nav.collapsed .category-list {
    display: none;
  }
}

@media (max-width: 768px) {
  .categories-overview {
    gap: 24px;
  }

  .category-overview-content {
    padding: 20px;
  }

  .category-overview-content h2 {
    font-size: 1.25rem;
  }

  .category-overview-features {
    gap: 8px;
  }

  .category-overview-features li {
    font-size: 0.75rem;
    padding: 4px 10px;
  }

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

  .products-grid.list-view .product-card {
    flex-direction: column;
  }

  .products-grid.list-view .product-card-image {
    width: 100%;
    aspect-ratio: 1/1;
  }

  .products-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .view-toggle {
    justify-content: center;
  }

  .sort-control select {
    width: 100%;
  }

  .products-layout {
    padding: 24px 16px;
  }

  .category-link {
    padding: 12px 16px;
  }

  .subcategory-list a {
    padding: 10px 16px 10px 48px;
  }

  .product-card-content {
    padding: 16px;
  }

  .product-card-title {
    font-size: 1rem;
  }
}

.product-detail-page {
  padding: 40px 0 80px;
}

.breadcrumb-wrapper {
  margin-bottom: 24px;
}

.product-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-bottom: 80px;
}

.product-gallery-section {
  position: sticky;
  top: 80px;
}

.main-product-image {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  background-color: var(--color-bg-light-gray);
  box-shadow: var(--shadow-medium);
  margin-bottom: 16px;
}

.main-product-image img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1/1;
  object-fit: cover;
}

.image-zoom-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 48px;
  height: 48px;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
  color: var(--color-text-1);
  opacity: 0;
  transform: scale(0.9);
}

.main-product-image:hover .image-zoom-btn {
  opacity: 1;
  transform: scale(1);
}

.image-zoom-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: scale(1.1);
}

.image-zoom-btn i {
  font-size: 24px;
  color: var(--color-white);
}

.product-thumbnails {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.thumbnail-item {
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  border: 3px solid transparent;
  transition: var(--transition);
  background-color: var(--color-bg-light-gray);
}

.thumbnail-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

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

.thumbnail-item img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1/1;
  object-fit: cover;
}

.product-info-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.product-badge {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 20px;
  align-self: flex-start;
}

.product-name {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin: 0;
  line-height: 1.2;
}

.product-category-tag {
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-link {
  display: inline-block;
  padding: 6px 16px;
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: var(--transition);
}

.category-link:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.product-short-desc {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-2);
  margin: 0;
}

.product-highlights {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(0, 120, 200, 0.05) 0%, rgba(0, 90, 156, 0.05) 100%);
  border-radius: 8px;
  border: 1px solid rgba(0, 120, 200, 0.1);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-1);
}

.highlight-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.highlight-icon i {
  font-size: 20px;
  color: var(--color-primary);
}

.product-specs-quick {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.spec-quick-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background-color: var(--color-bg-light-gray);
  border-radius: 8px;
  transition: var(--transition);
}

.spec-quick-item:hover {
  background-color: rgba(0, 120, 200, 0.05);
  transform: translateY(-2px);
}

.spec-label {
  font-size: 0.75rem;
  color: var(--color-text-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.spec-value {
  font-size: 1rem;
  color: var(--color-text-1);
  font-weight: 600;
}

.product-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 8px;
}

.product-actions .btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: var(--transition);
}

.product-actions .btn i {
  font-size: 20px;
  color: var(--color-white);
}

.product-actions .btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
}

.product-actions .btn-primary:hover {
  background-color: var(--color-accent-dark-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.product-actions .btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.product-actions .btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-back {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: transparent;
  color: var(--color-text-2);
  border: 1px solid var(--color-border-light);
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
  align-self: flex-start;
}

.btn-back:hover {
  background-color: var(--color-bg-light-gray);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-back i {
  font-size: 18px;
  color: var(--color-primary);
}

.product-description-section {
  margin-top: 120px;
  margin-bottom: 80px;
}

.description-content-wrapper {
  max-width: 900px;
}

.description-content-wrapper h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin: 0 0 32px 0;
}

.description-content p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text-2);
  margin: 0 0 20px 0;
}

.description-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.desc-feature-item {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(0, 120, 200, 0.03) 0%, rgba(0, 90, 156, 0.03) 100%);
  border-radius: 12px;
  border: 1px solid rgba(0, 120, 200, 0.1);
  transition: var(--transition);
}

.desc-feature-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: var(--color-primary);
}

.desc-feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  flex-shrink: 0;
}

.desc-feature-icon i {
  font-size: 28px;
  color: var(--color-white);
}

.desc-feature-text h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin: 0 0 8px 0;
}

.desc-feature-text p {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text-2);
  margin: 0;
}

.related-products-section {
  padding-top: 40px;
  border-top: 1px solid var(--color-border-light);
}

.coating-techniques-section {
  margin-bottom: 80px;
}

.coating-techniques-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.coating-technique-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
}

.coating-technique-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.coating-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.coating-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.coating-technique-card:hover .coating-image img {
  transform: scale(1.05);
}

.coating-technique-info {
  padding: 20px;
}

.coating-technique-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 8px;
}

.coating-technique-card p {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.5;
  margin: 0;
}

.color-options-section {
  margin-bottom: 80px;
}

.color-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.color-option-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
}

.color-option-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.color-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 27/8;
}

.color-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.color-option-card:hover .color-image img {
  transform: scale(1.05);
}

.color-option-info {
  padding: 20px;
}

.color-option-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 8px;
}

.color-code {
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.color-desc {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.5;
  margin-bottom: 12px;
}

.color-usage {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.usage-tag {
  background-color: rgba(0, 120, 200, 0.1);
  color: var(--color-primary);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.color-application {
  font-size: 0.8125rem;
  color: var(--color-text-2);
  line-height: 1.5;
  margin: 0;
}

.color-options-note {
  background-color: var(--color-bg-light-gray);
  border-radius: var(--border-radius);
  padding: 20px 24px;
  text-align: center;
}

.color-options-note p {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin: 0 0 8px 0;
}

.color-options-note p:last-child {
  margin-bottom: 0;
}

.patterns-section {
  margin-bottom: 80px;
}

.patterns-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pattern-card {
  background-color: var(--color-bg-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
}

.pattern-card:hover {
  box-shadow: var(--shadow-medium);
  transform: translateY(-4px);
}

.pattern-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.pattern-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.pattern-card:hover .pattern-image img {
  transform: scale(1.05);
}

.pattern-info {
  padding: 20px;
}

.pattern-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin-bottom: 12px;
}

.pattern-info p {
  font-size: 0.875rem;
  color: var(--color-text-2);
  line-height: 1.6;
  margin: 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-1);
  margin: 0 0 8px 0;
}

.section-header p {
  font-size: 1rem;
  color: var(--color-text-2);
  margin: 0;
}

.related-products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.related-product-card {
  background-color: var(--color-bg-white);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.related-product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-medium);
  border-color: var(--color-primary);
}

.related-product-image {
  overflow: hidden;
}

.related-product-image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: var(--transition);
}

.related-product-card:hover .related-product-image img {
  transform: scale(1.05);
}

.related-product-info {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.related-product-category {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.related-product-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-1);
  margin: 0;
}

.related-product-info p {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text-2);
  margin: 0;
}

.related-product-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.spec-tag {
  padding: 4px 12px;
  background-color: var(--color-bg-light-gray);
  color: var(--color-text-2);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 4px;
}

.related-product-info .btn {
  margin-top: auto;
  align-self: flex-start;
}

@media (max-width: 1200px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .related-products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .color-options-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 992px) {
  .product-main {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  
  .product-gallery-section {
    position: static;
  }
  
  .description-features {
    grid-template-columns: 1fr;
  }
  
  .applications-list {
    grid-template-columns: 1fr;
  }
  
  .coating-techniques-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .product-detail-page {
    padding: 24px 0 48px;
  }
  
  .product-name {
    font-size: 2rem;
  }
  
  .product-specs-quick {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .related-products-grid {
    grid-template-columns: 1fr;
  }
  
  .coating-techniques-grid {
    grid-template-columns: 1fr;
  }

  .color-options-grid {
    grid-template-columns: 1fr;
  }

  .patterns-grid {
    grid-template-columns: 1fr;
  }
  
  .timeline-item {
    flex-direction: column;
    gap: 16px;
  }
  
  .timeline-number {
    width: 48px;
    height: 48px;
    font-size: 1.25rem;
  }
  
  .tabs-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
  }
  
  .tab-nav-btn {
    padding: 12px 20px;
    font-size: 0.875rem;
  }
  
  .product-description-section {
    margin-top: 80px;
  }
}