/* ========================================
   Product Page Styles
   ======================================== */

/* Breadcrumb */
.breadcrumb-bar {
  background: var(--bg-light);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-light);
  transition: color var(--transition);
}

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

.breadcrumb .separator {
  font-size: 0.65rem;
  opacity: 0.5;
}

.breadcrumb .current {
  color: var(--dark);
  font-weight: 500;
}

/* Product Layout */
.product-detail {
  padding: 32px 0 60px;
}

.product-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: flex-start;
}

/* Gallery */
.product-gallery {
  position: sticky;
  top: 140px;
}

.gallery-main {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-light);
  aspect-ratio: 1;
  margin-bottom: 16px;
}

.gallery-image-wrap {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-main:hover .gallery-image-wrap img {
  transform: scale(1.03);
}

.gallery-main .product-badge {
  top: 16px;
  left: 16px;
  z-index: 3;
}

.gallery-main .wishlist-btn {
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  font-size: 1.1rem;
}

.zoom-btn {
  position: absolute;
  top: 16px;
  right: 72px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  z-index: 2;
  transition: all var(--transition);
}

.zoom-btn:hover {
  background: #fff;
  color: var(--primary);
  transform: scale(1.05);
}

.gallery-counter {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  z-index: 2;
}

.gallery-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.95);
  color: var(--dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  z-index: 2;
  opacity: 0;
  transition: all var(--transition);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

.gallery-main:hover .gallery-arrow {
  opacity: 1;
}

.gallery-arrow:hover {
  background: var(--primary);
  color: #fff;
}

.gallery-prev { left: 16px; }
.gallery-next { right: 16px; }

.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.gallery-thumb {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: border-color var(--transition);
  background: var(--bg-light);
}

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

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

.gallery-thumb:hover {
  border-color: var(--primary-light);
}

.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.7rem;
  gap: 2px;
}

.video-overlay i {
  font-size: 1.2rem;
}

/* Product Info Detail */
.product-info-detail {
  padding-top: 8px;
}

.product-brand {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.product-brand a {
  color: var(--primary);
  font-weight: 600;
}

.product-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.3;
  margin-bottom: 14px;
}

.product-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  font-size: 0.85rem;
  flex-wrap: wrap;
}

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

.product-rating-detail .stars {
  font-size: 0.9rem;
}

.rating-value {
  font-weight: 700;
  color: var(--dark);
}

.review-count {
  color: var(--primary);
  text-decoration: underline;
}

.meta-separator {
  color: var(--border);
}

.sold-count {
  color: var(--danger);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
}

.share-link {
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

/* Pricing */
.product-pricing {
  padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.price-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.price-main {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: -1px;
}

.price-strike {
  font-size: 1.2rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.price-save {
  padding: 4px 12px;
  background: rgba(198, 40, 40, 0.1);
  color: var(--danger);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 4px;
  text-transform: uppercase;
}

.price-financing {
  font-size: 0.85rem;
  color: var(--text-light);
}

.price-financing strong {
  color: var(--dark);
}

.affirm-tag {
  display: inline-block;
  padding: 2px 8px;
  background: #060ce9;
  color: #fff;
  border-radius: 3px;
  font-size: 0.7rem;
  font-weight: 700;
  margin-left: 2px;
}

/* Shipping Info */
.product-shipping-info {
  margin-bottom: 28px;
  padding: 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.shipping-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
}

.shipping-row + .shipping-row {
  border-top: 1px solid rgba(0,0,0,0.05);
}

.shipping-row i {
  font-size: 1.1rem;
  color: var(--primary);
  margin-top: 3px;
  flex-shrink: 0;
}

.shipping-row strong {
  display: block;
  font-size: 0.88rem;
  color: var(--dark);
  margin-bottom: 2px;
}

.shipping-row span {
  font-size: 0.8rem;
  color: var(--text-light);
}

.shipping-row span strong {
  display: inline;
  font-size: inherit;
  color: var(--success);
}

/* Options */
.product-option {
  margin-bottom: 24px;
}

.option-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 0.85rem;
}

.option-label span {
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-weight: 500;
}

.option-label strong {
  color: var(--dark);
  font-weight: 600;
}

/* Color Swatches */
.color-options {
  display: flex;
  gap: 10px;
}

.color-swatch {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid var(--bg);
  outline: 2px solid var(--border);
  cursor: pointer;
  position: relative;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.color-swatch i {
  color: #fff;
  font-size: 1rem;
  opacity: 0;
  transition: opacity var(--transition);
  text-shadow: 0 0 4px rgba(0,0,0,0.3);
}

.color-swatch.active {
  outline-color: var(--primary);
}

.color-swatch.active i {
  opacity: 1;
}

.color-swatch:hover {
  transform: scale(1.05);
}

/* Size Options */
.size-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.size-option {
  padding: 12px 8px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.size-option strong {
  display: block;
  font-size: 0.85rem;
  color: var(--dark);
  margin-bottom: 2px;
}

.size-option span {
  display: block;
  font-size: 0.75rem;
  color: var(--text-light);
}

.size-option:hover {
  border-color: var(--primary-light);
}

.size-option.active {
  border-color: var(--primary);
  background: rgba(139, 111, 71, 0.05);
}

/* Curtain Options */
.curtain-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.curtain-option {
  padding: 10px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all var(--transition);
}

.curtain-option:hover {
  border-color: var(--primary-light);
}

.curtain-option.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

/* Add-ons */
.addon-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.addon-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

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

.addon-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.addon-item input:checked ~ .addon-info strong {
  color: var(--primary);
}

.addon-item:has(input:checked) {
  border-color: var(--primary);
  background: rgba(139, 111, 71, 0.05);
}

.addon-info {
  flex: 1;
}

.addon-info strong {
  display: block;
  font-size: 0.88rem;
  color: var(--dark);
  margin-bottom: 2px;
}

.addon-info span {
  font-size: 0.78rem;
  color: var(--text-light);
}

.addon-price {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

/* Actions */
.product-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  align-items: stretch;
}

.quantity-selector {
  display: flex;
  align-items: center;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.qty-btn {
  width: 44px;
  height: 52px;
  background: var(--bg);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--dark);
  transition: background var(--transition);
}

.qty-btn:hover {
  background: var(--bg-light);
}

#qtyInput {
  width: 56px;
  height: 52px;
  text-align: center;
  border: none;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  outline: none;
}

#qtyInput::-webkit-inner-spin-button,
#qtyInput::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.btn-add-cart-large {
  flex: 1;
  padding: 14px 28px;
  background: var(--dark);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition);
}

.btn-add-cart-large:hover {
  background: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.btn-buy-now {
  width: 100%;
  padding: 14px 28px;
  background: var(--bg);
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 24px;
}

.btn-buy-now:hover {
  background: var(--primary);
  color: #fff;
}

/* Trust Grid */
.product-trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.trust-item i {
  font-size: 1.3rem;
  color: var(--primary);
}

.trust-item strong {
  display: block;
  font-size: 0.78rem;
  color: var(--dark);
  font-weight: 700;
}

.trust-item span {
  font-size: 0.72rem;
  color: var(--text-light);
}

/* Quick Info */
.product-quick-info {
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.info-row {
  display: flex;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.85rem;
}

.info-row span {
  color: var(--text-light);
  min-width: 110px;
}

.info-row strong {
  color: var(--dark);
  font-weight: 500;
}

.in-stock {
  color: var(--success) !important;
  display: flex;
  align-items: center;
  gap: 6px;
}

.in-stock i {
  font-size: 0.5rem;
}

/* ============ TABS ============ */
.product-tabs-section {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border);
}

.product-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 32px;
  overflow-x: auto;
  scrollbar-width: none;
}

.product-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-light);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  margin-bottom: -2px;
}

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

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

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Description */
.description-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.description-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.description-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin: 28px 0 12px;
}

.description-content .lead {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.7;
  margin-bottom: 20px;
}

.description-content p {
  color: var(--text-light);
  line-height: 1.7;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
}

.feature-list i {
  color: var(--success);
  margin-top: 4px;
  flex-shrink: 0;
}

.feature-list strong {
  color: var(--dark);
}

.description-image {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}

.description-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 400px;
}

.image-caption {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  padding: 12px 16px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-style: italic;
  backdrop-filter: blur(10px);
}

/* Feature Highlights */
.feature-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.highlight-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--bg-light);
  border-radius: var(--radius);
}

.highlight-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 1.4rem;
  color: var(--primary);
}

.highlight-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.highlight-card p {
  font-size: 0.8rem;
  color: var(--text-light);
  line-height: 1.5;
}

/* Specifications */
.specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.specs-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr {
  border-bottom: 1px solid var(--border);
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table td {
  padding: 12px 0;
  font-size: 0.9rem;
}

.specs-table td:first-child {
  color: var(--text-light);
  width: 45%;
}

.specs-table td:last-child {
  color: var(--dark);
  font-weight: 500;
  text-align: right;
}

/* Reviews */
.reviews-summary {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
  padding: 24px;
  background: var(--bg-light);
  border-radius: var(--radius);
  margin-bottom: 32px;
}

.reviews-overall {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding-right: 32px;
  border-right: 1px solid var(--border);
}

.reviews-score strong {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--dark);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
}

.reviews-score .stars {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.reviews-score span {
  font-size: 0.85rem;
  color: var(--text-light);
}

.reviews-bars {
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
}

.bar-label {
  width: 36px;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text);
  font-weight: 500;
}

.bar-label i {
  color: #f59e0b;
  font-size: 0.7rem;
}

.bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 4px;
  transition: width 0.6s ease;
}

.bar-count {
  width: 30px;
  text-align: right;
  color: var(--text-light);
  font-size: 0.8rem;
}

.reviews-filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.review-sort {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: inherit;
  background: var(--bg);
  cursor: pointer;
}

.review-filter-tags {
  display: flex;
  gap: 8px;
}

.filter-tag {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem;
  background: var(--bg);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-tag:hover {
  border-color: var(--primary);
}

.filter-tag.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.reviews-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.review-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.reviewer-info {
  flex: 1;
}

.reviewer-info strong {
  display: block;
  font-size: 0.92rem;
  color: var(--dark);
}

.reviewer-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
  flex-wrap: wrap;
}

.verified-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--success);
  font-weight: 500;
}

.review-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-rating {
  margin-bottom: 10px;
}

.review-rating .stars {
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.review-rating h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
}

.review-card p {
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 14px;
}

.review-images {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.review-images img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition);
}

.review-images img:hover {
  transform: scale(1.05);
}

.review-actions {
  display: flex;
  gap: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.review-actions button {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-light);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.review-actions button:hover {
  color: var(--primary);
  background: var(--bg-light);
}

.btn-load-more {
  align-self: center;
  margin-top: 12px;
}

/* Q&A */
.qa-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.qa-header h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.qa-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.qa-item {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.qa-question, .qa-answer {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.qa-question {
  margin-bottom: 12px;
}

.qa-tag {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-light);
  color: var(--dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.qa-tag-answer {
  background: var(--primary);
  color: #fff;
}

.qa-question p, .qa-answer p {
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.6;
}

.qa-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Shipping Cards */
.info-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.info-card-large {
  padding: 28px;
  background: var(--bg-light);
  border-radius: var(--radius);
}

.info-card-large i {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 16px;
}

.info-card-large h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.info-card-large p {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
  margin-bottom: 14px;
}

.info-card-large ul {
  list-style: none;
  padding: 0;
}

.info-card-large ul li {
  padding: 4px 0;
  padding-left: 20px;
  position: relative;
  font-size: 0.85rem;
  color: var(--text-light);
}

.info-card-large ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

/* Installation Tab */
.installation-info {
  max-width: 900px;
  margin: 0 auto;
}

.installation-hero {
  text-align: center;
  margin-bottom: 40px;
}

.installation-hero h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.installation-hero .lead {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.7;
}

.installation-process h4,
.installation-benefits h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
  text-align: center;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--border);
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-num {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 1.4rem;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(139, 111, 71, 0.3);
}

.step h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.step p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.5;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.benefit {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text);
}

.benefit i {
  color: var(--success);
}

/* Related & Recently Viewed */
.related-products,
.recently-viewed {
  padding: 60px 0;
}

.related-products {
  background: var(--bg-light);
}

/* Sticky Add to Cart (Mobile) */
.sticky-add-cart {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  z-index: 99;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
  gap: 12px;
  align-items: center;
}

.sticky-product {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.sticky-product img {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.sticky-product strong {
  display: block;
  font-size: 0.8rem;
  color: var(--dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sticky-price {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary);
}

.sticky-cta {
  padding: 12px 20px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .product-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .product-gallery {
    position: relative;
    top: 0;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
  }

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

  .description-image img {
    min-height: 280px;
  }

  .specs-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .info-cards {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .product-detail {
    padding: 20px 0 80px;
  }

  .product-title {
    font-size: 1.4rem;
  }

  .price-main {
    font-size: 1.9rem;
  }

  .gallery-thumbs {
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
  }

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

  .product-meta {
    font-size: 0.8rem;
    gap: 10px;
  }

  .meta-separator {
    display: none;
  }

  .product-tabs {
    margin: 0 -20px 24px;
    padding: 0 20px;
  }

  .tab-btn {
    padding: 12px 16px;
    font-size: 0.85rem;
  }

  .reviews-summary {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .reviews-overall {
    padding-right: 0;
    padding-bottom: 24px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .reviews-filters {
    flex-direction: column;
    align-items: stretch;
  }

  .review-filter-tags {
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

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

  .process-steps::before {
    display: none;
  }

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

  .feature-highlights {
    grid-template-columns: 1fr 1fr;
  }

  .product-actions {
    flex-direction: column;
  }

  .quantity-selector {
    align-self: flex-start;
  }

  .btn-add-cart-large {
    width: 100%;
  }

  .related-products,
  .recently-viewed {
    padding: 40px 0;
  }

  /* Show sticky cart on mobile */
  .sticky-add-cart {
    display: flex;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }

  .mobile-bottom-nav {
    display: none;
  }

  .back-to-top {
    bottom: 88px;
  }

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

@media (max-width: 480px) {
  .price-main {
    font-size: 1.7rem;
  }

  .review-card,
  .qa-item {
    padding: 16px;
  }

  .gallery-thumbs {
    grid-template-columns: repeat(4, 1fr);
  }

  .gallery-thumbs .gallery-thumb:nth-child(5) {
    display: none;
  }
}