html {
     color-scheme: dark;
 }
 
 body {
     font-family: var(--font);
     background-color: var(--bg-primary);
     color: var(--text-primary);
     line-height: 1.6;
     overflow-x: hidden;
     margin: 0;
     padding: 0;
 }
 
 .logo {
     font-size: 1.5rem;
     font-weight: var(--weight-bold);
     color: var(--primary);
     text-decoration: none;
     font-family: var(--font-alt);
 }
 
 .search-bar-nav {
     flex: 1;
     max-width: 600px;
     margin: 0 2rem;
 }
 
 .search-input-wrapper {
     position: relative;
     width: 100%;
 }
 
 .search-input {
     width: 100%;
     padding: 0.75rem 3rem 0.75rem 1rem;
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
     color: var(--text-primary);
     font-size: 0.95rem;
     transition: all 0.3s ease;
 }
 
 .search-input:focus {
     outline: none;
     border-color: var(--primary);
     box-shadow: 0 0 0 3px rgba(8, 121, 145, 0.1);
 }
 
 .search-btn {
     position: absolute;
     right: 0.5rem;
     top: 50%;
     transform: translateY(-50%);
     background: var(--primary);
     color: white;
     border: none;
     padding: 0.5rem 1rem;
     border-radius: var(--ins-radius-s);
     cursor: pointer;
     transition: all 0.3s ease;
 }
 
 .search-btn:hover {
     background: var(--primary-dark);
 }
 
 .nav-auth {
     display: flex;
     gap: 1rem;
     align-items: center;
 }
 /* Main Content */
 
 .main-content {
     margin-top: 80px;
     max-width: 1600px;
     margin-left: auto;
     margin-right: auto;
     padding: 2rem;
 }
 /* Profile Header */
 
 .profile-header {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     padding: 2rem;
     margin-bottom: 2rem;
 }
 
 .profile-top {
     display: flex;
     gap: 2rem;
     align-items: start;
     margin-bottom: 2rem;
 }
 
 .profile-avatar {
     width: 120px;
     height: 120px;
     border-radius: 50%;
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 3.5rem;
     flex-shrink: 0;
     border: 4px solid var(--border);
 }
 
 .profile-info {
     flex: 1;
 }
 
 .profile-name {
     font-size: 2rem;
     font-weight: var(--weight-bold);
     color: var(--text-primary);
     margin-bottom: 0.5rem;
     font-family: var(--font-alt);
 }
 
 .profile-username {
     font-size: 1rem;
     color: var(--text-secondary);
     margin-bottom: 0.75rem;
 }
 
 .profile-bio {
     font-size: 1rem;
     color: var(--text-secondary);
     line-height: 1.6;
     margin-bottom: 1rem;
 }
 
 .profile-website {
     color: var(--primary);
     text-decoration: none;
     font-size: 0.95rem;
     display: inline-flex;
     align-items: center;
     gap: 0.5rem;
     margin-bottom: 1.5rem;
 }
 
 .profile-website:hover {
     text-decoration: underline;
 }
 
 .profile-actions {
     display: flex;
     gap: 1rem;
     flex-wrap: wrap;
 }
 
 .btn-message {
     padding: 0.75rem 2rem;
     background: transparent;
     color: var(--text-primary);
     border: 2px solid var(--border);
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     transition: all 0.3s ease;
     font-size: 1rem;
 }
 
 .btn-message:hover {
     border-color: var(--primary);
     color: var(--primary);
 }
 
 .btn-share {
     padding: 0.75rem 1.25rem;
     background: transparent;
     color: var(--text-primary);
     border: 2px solid var(--border);
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     transition: all 0.3s ease;
     font-size: 1rem;
 }
 
 .btn-share:hover {
     border-color: var(--primary);
     color: var(--primary);
 }
 /* Profile Stats */
 
 .profile-stats {
     display: flex;
     gap: 3rem;
     padding: 1.5rem 0;
     border-top: 1px solid var(--border);
 }
 
 .stat-item {
     display: flex;
     flex-direction: column;
     gap: 0.25rem;
 }
 
 .stat-value {
     font-size: 1.75rem;
     font-weight: var(--weight-bold);
     color: var(--text-primary);
     font-family: var(--font-alt);
 }
 
 .stat-label {
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 /* Tabs Navigation */
 
 .tabs-nav {
     display: flex;
     gap: 0;
     border-bottom: 2px solid var(--border);
     margin-bottom: 2rem;
     overflow-x: auto;
 }
 
 .tab-btn {
     padding: 1rem 1.5rem;
     background: transparent;
     border: none;
     color: var(--text-secondary);
     cursor: pointer;
     transition: all 0.3s ease;
     font-weight: var(--weight-semibold);
     font-size: 1rem;
     position: relative;
     border-bottom: 3px solid transparent;
     white-space: nowrap;
 }
 
 .tab-btn:hover {
     color: var(--text-primary);
     background: var(--bg-secondary);
 }
 
 .tab-btn.active {
     color: var(--primary);
     border-bottom-color: var(--primary);
 }
 
 .tab-count {
     color: var(--text-secondary);
     font-size: 0.9rem;
     margin-left: 0.5rem;
 }
 
 .tab-btn.active .tab-count {
     color: var(--primary);
 }
 /* Tab Content */
 
 .tab-content {
     display: none;
 }
 
 .tab-content.active {
     display: block;
     animation: fadeIn 0.3s ease;
 }
 
 @keyframes fadeIn {
     from {
         opacity: 0;
         transform: translateY(10px);
     }
     to {
         opacity: 1;
         transform: translateY(0);
     }
 }
 /* Filter Bar */
 
 .filter-bar {
     display: flex;
     justify-content: space-between;
     align-items: center;
     margin-bottom: 2rem;
     padding: 1rem;
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
 }
 
 .filter-left {
     display: flex;
     gap: 1rem;
     align-items: center;
 }
 
 .filter-search {
     padding: 0.6rem 1rem;
     background: var(--bg-tertiary);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-s);
     color: var(--text-primary);
     width: 250px;
 }
 
 .filter-search:focus {
     outline: none;
     border-color: var(--primary);
 }
 
 .sort-select {
     padding: 0.6rem 1rem;
     background: var(--bg-tertiary);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-s);
     color: var(--text-primary);
     cursor: pointer;
 }
 /* Creators Grid */
 
 .creator-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
     gap: 1.5rem;
     margin-bottom: 3rem;
 }
 
 .creator-card {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     padding: 1.5rem;
     transition: all 0.3s ease;
     cursor: pointer;
     display: flex;
     flex-direction: column;
     align-items: center;
     text-align: center;
 }
 
 .creator-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-lg);
     border-color: var(--primary);
 }
 
 .creator-avatar {
     width: 80px;
     height: 80px;
     border-radius: 50%;
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 2.5rem;
     margin-bottom: 1rem;
     border: 3px solid var(--border);
 }
 
 .creator-badge {
     position: relative;
     margin-bottom: 1rem;
 }
 
 .badge-icon {
     position: absolute;
     bottom: -5px;
     right: -5px;
     background: var(--warning);
     color: white;
     width: 28px;
     height: 28px;
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 0.75rem;
     border: 2px solid var(--surface);
 }
 
 .creator-name {
     font-size: 1.1rem;
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     margin-bottom: 0.25rem;
 }
 
 .creator-username {
     font-size: 0.85rem;
     color: var(--text-secondary);
     margin-bottom: 0.75rem;
 }
 
 .creator-skills {
     display: flex;
     flex-wrap: wrap;
     gap: 0.4rem;
     justify-content: center;
     margin-bottom: 1rem;
 }
 
 .skill-tag {
     padding: 0.3rem 0.7rem;
     background: var(--bg-tertiary);
     border-radius: var(--ins-radius-s);
     font-size: 0.75rem;
     color: var(--text-secondary);
 }
 
 .creator-stats {
     display: flex;
     gap: 1.5rem;
     margin-bottom: 1rem;
     font-size: 0.85rem;
     color: var(--text-secondary);
 }
 
 .creator-stat {
     display: flex;
     flex-direction: column;
     gap: 0.15rem;
 }
 
 .stat-number {
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
 }
 
 .btn-follow-small {
     width: 100%;
     padding: 0.65rem 1.5rem;
     background: transparent;
     color: var(--primary);
     border: 2px solid var(--primary);
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     transition: all 0.3s ease;
     font-size: 0.9rem;
 }
 
 .btn-follow-small:hover {
     background: var(--primary);
     color: white;
 }
 
 .btn-follow-small.following {
     background: var(--primary);
     color: white;
 }
 /* Load More Button */
 
 .load-more {
     text-align: center;
     margin: 2rem 0;
 }
 
 .btn-load-more {
     padding: 1rem 3rem;
     background: var(--surface);
     border: 2px solid var(--border);
     border-radius: var(--ins-radius-m);
     color: var(--text-primary);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     transition: all 0.3s ease;
     font-size: 1rem;
 }
 
 .btn-load-more:hover {
     border-color: var(--primary);
     color: var(--primary);
     transform: translateY(-2px);
 }
 /* Collections Grid */
 
 .collections-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
     gap: 2rem;
     margin-bottom: 3rem;
 }
 
 .collection-card {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     overflow: hidden;
     transition: all 0.3s ease;
     cursor: pointer;
     display: flex;
     flex-direction: column;
 }
 
 .collection-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-lg);
     border-color: var(--primary);
 }
 /* Collection Preview (2x2 Grid) */
 
 .collection-preview {
     display: grid;
     grid-template-columns: repeat(2, 1fr);
     grid-template-rows: repeat(2, 1fr);
     gap: 2px;
     background: var(--border);
     position: relative;
 }
 
 .preview-item {
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 2.5rem;
     overflow: hidden;
 }
 
 .preview-item:first-child {
     border-radius: var(--ins-radius-l) 0 0 0;
 }
 
 .preview-item:nth-child(2) {
     border-radius: 0 var(--ins-radius-l) 0 0;
 }
 
 .preview-item:nth-child(3) {
     border-radius: 0 0 0 0;
 }
 
 .preview-item:nth-child(4) {
     border-radius: 0 0 0 0;
 }
 
 .collection-badge {
     position: absolute;
     top: 1rem;
     right: 1rem;
     background: rgba(0, 0, 0, 0.8);
     backdrop-filter: blur(10px);
     color: white;
     padding: 0.5rem 0.85rem;
     border-radius: var(--ins-radius-s);
     font-weight: var(--weight-semibold);
     font-size: 0.85rem;
     display: flex;
     align-items: center;
     gap: 0.5rem;
 }
 /* Collection Info */
 
 .collection-info {
     padding: 1.5rem;
     flex: 1;
     display: flex;
     flex-direction: column;
 }
 
 .collection-header {
     display: flex;
     align-items: start;
     gap: 1rem;
     margin-bottom: 1rem;
 }
 
 .collection-icon {
     width: 50px;
     height: 50px;
     border-radius: var(--ins-radius-m);
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.5rem;
     flex-shrink: 0;
 }
 
 .collection-title-group {
     flex: 1;
 }
 
 .collection-title {
     font-size: 1.25rem;
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     margin-bottom: 0.25rem;
     line-height: 1.3;
 }
 
 .collection-author {
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 
 .collection-description {
     font-size: 0.95rem;
     color: var(--text-secondary);
     line-height: 1.6;
     margin-bottom: 1rem;
     flex: 1;
     display: -webkit-box;
     -webkit-line-clamp: 2;
     -webkit-box-orient: vertical;
     overflow: hidden;
 }
 
 .collection-meta {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding-top: 1rem;
     border-top: 1px solid var(--border);
 }
 
 .collection-stats {
     display: flex;
     gap: 1.25rem;
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 
 .stat-item {
     display: flex;
     align-items: center;
     gap: 0.4rem;
 }
 
 .btn-subscribe {
     background: transparent;
     border: 2px solid var(--primary);
     color: var(--primary);
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     font-size: 0.9rem;
     transition: all 0.3s ease;
 }
 
 .btn-subscribe:hover {
     background: var(--primary);
     color: white;
 }
 
 .btn-subscribe.subscribed {
     background: var(--primary);
     color: white;
 }
 /* Empty State */
 
 .empty-state {
     text-align: center;
     padding: 4rem 2rem;
     color: var(--text-secondary);
 }
 
 .empty-icon {
     font-size: 4rem;
     margin-bottom: 1rem;
 }
 
 .empty-title {
     font-size: 1.5rem;
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     margin-bottom: 0.5rem;
 }
 
 .empty-text {
     font-size: 1rem;
 }
 /* Footer */
 
 footer {
     background: var(--surface);
     border-top: 1px solid var(--border);
     padding: 2rem 0;
     text-align: center;
     color: var(--text-secondary);
     font-size: 0.9rem;
     margin-top: 4rem;
 }
 /* Responsive */
 
 @media (max-width: 1024px) {
     .creator-grid {
         grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
     }
 }
 
 @media (max-width: 768px) {
     .nav-container {
         flex-wrap: wrap;
     }
     .search-bar-nav {
         order: 3;
         max-width: 100%;
         margin: 1rem 0 0 0;
         width: 100%;
     }
     .main-content {
         padding: 1rem;
     }
     .profile-header {
         padding: 1.5rem;
     }
     .profile-top {
         flex-direction: column;
         align-items: center;
         text-align: center;
     }
     .profile-avatar {
         width: 100px;
         height: 100px;
         font-size: 3rem;
     }
     .profile-name {
         font-size: 1.5rem;
     }
     .profile-stats {
         justify-content: space-around;
         gap: 1.5rem;
     }
     .stat-value {
         font-size: 1.5rem;
     }
     .tabs-nav {
         overflow-x: auto;
     }
     .tab-btn {
         padding: 0.85rem 1.25rem;
         font-size: 0.9rem;
     }
     .filter-bar {
         flex-direction: column;
         gap: 1rem;
     }
     .filter-left {
         width: 100%;
         flex-direction: column;
     }
     .filter-search {
         width: 100%;
     }
     .creator-grid {
         grid-template-columns: 1fr;
     }
 }
 /*Models */
 
 html {
     color-scheme: dark;
 }
 
 body {
     font-family: var(--font);
     background-color: var(--bg-primary);
     color: var(--text-primary);
     line-height: 1.6;
     overflow-x: hidden;
     margin: 0;
     padding: 0;
 }
 /* Navigation */
 
 .logo {
     font-size: 1.5rem;
     font-weight: var(--weight-bold);
     color: var(--primary);
     text-decoration: none;
     font-family: var(--font-alt);
 }
 
 .search-bar-nav {
     flex: 1;
     max-width: 600px;
     margin: 0 2rem;
 }
 
 .search-input-wrapper {
     position: relative;
     width: 100%;
 }
 
 .search-input {
     width: 100%;
     padding: 0.75rem 3rem 0.75rem 1rem;
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
     color: var(--text-primary);
     font-size: 0.95rem;
     transition: all 0.3s ease;
 }
 
 .search-input:focus {
     outline: none;
     border-color: var(--primary);
     box-shadow: 0 0 0 3px rgba(8, 121, 145, 0.1);
 }
 
 .search-btn {
     position: absolute;
     right: 0.5rem;
     top: 50%;
     transform: translateY(-50%);
     background: var(--primary);
     color: white;
     border: none;
     padding: 0.5rem 1rem;
     border-radius: var(--ins-radius-s);
     cursor: pointer;
     transition: all 0.3s ease;
 }
 
 .search-btn:hover {
     background: var(--primary-dark);
 }
 
 .nav-auth {
     display: flex;
     gap: 1rem;
     align-items: center;
 }
 /* Main Content */
 
 .main-content {
     margin-top: 80px;
     max-width: 1600px;
     margin-left: auto;
     margin-right: auto;
     padding: 2rem;
 }
 /* Breadcrumb */
 
 .breadcrumb {
     display: flex;
     align-items: center;
     gap: 0.5rem;
     margin-bottom: 2rem;
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 
 .breadcrumb a {
     color: var(--primary);
     text-decoration: none;
     transition: color 0.3s ease;
 }
 
 .breadcrumb a:hover {
     color: var(--text-primary);
 }
 
 .breadcrumb-separator {
     color: var(--text-secondary);
 }
 /* Product Layout */
 
 .product-layout {
     display: grid;
     grid-template-columns: 1fr 450px;
     gap: 3rem;
     margin-bottom: 4rem;
 }
 /* 3D Viewer Section */
 
 .viewer-section {
     position: sticky;
     top: 100px;
     height: fit-content;
 }
 
 .viewer-container {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     overflow: hidden;
     position: relative;
     aspect-ratio: 16/10;
 }
 
 .viewer-placeholder {
     width: 100%;
     height: 100%;
     background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 4rem;
     position: relative;
 }
 
 .viewer-controls {
     position: absolute;
     bottom: 1rem;
     left: 1rem;
     right: 1rem;
     display: flex;
     gap: 0.5rem;
     justify-content: space-between;
 }
 
 .control-btn {
     background: rgba(0, 0, 0, 0.7);
     backdrop-filter: blur(10px);
     color: white;
     border: none;
     padding: 0.75rem 1rem;
     border-radius: var(--ins-radius-s);
     cursor: pointer;
     transition: all 0.3s ease;
     font-size: 0.9rem;
     display: flex;
     align-items: center;
     gap: 0.5rem;
 }
 
 .control-btn:hover {
     background: rgba(0, 0, 0, 0.9);
     transform: translateY(-2px);
 }
 
 .viewer-thumbnails {
     display: grid;
     grid-template-columns: repeat(4, 1fr);
     gap: 0.75rem;
     margin-top: 1rem;
 }
 
 .thumbnail {
     aspect-ratio: 16/10;
     background: var(--surface);
     border: 2px solid var(--border);
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     transition: all 0.3s ease;
     overflow: hidden;
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.5rem;
 }
 
 .thumbnail:hover {
     border-color: var(--primary);
     transform: scale(1.05);
 }
 
 .thumbnail.active {
     border-color: var(--primary);
 }
 /* Product Info Section */
 
 .product-info {
     display: flex;
     flex-direction: column;
     gap: 2rem;
 }
 
 .product-header {
     border-bottom: 1px solid var(--border);
     padding-bottom: 1.5rem;
 }
 
 .product-title {
     font-size: 2rem;
     font-weight: var(--weight-bold);
     color: var(--text-primary);
     margin-bottom: 0.5rem;
     font-family: var(--font-alt);
 }
 
 .product-subtitle {
     font-size: 1rem;
     color: var(--text-secondary);
     margin-bottom: 1rem;
 }
 
 .product-rating {
     display: flex;
     align-items: center;
     gap: 1rem;
     flex-wrap: wrap;
 }
 
 .rating-stars {
     color: var(--warning);
     font-size: 1.1rem;
     display: flex;
     gap: 0.25rem;
 }
 
 .rating-count {
     color: var(--text-secondary);
     font-size: 0.9rem;
 }
 
 .product-stats {
     display: flex;
     gap: 1.5rem;
     font-size: 0.9rem;
 }
 
 .stat-item {
     color: var(--text-secondary);
     display: flex;
     align-items: center;
     gap: 0.25rem;
 }
 /* Author Info */
 
 .author-section {
     display: flex;
     align-items: center;
     gap: 1rem;
     padding: 1rem;
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
 }
 
 .author-avatar {
     width: 50px;
     height: 50px;
     border-radius: 50%;
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.5rem;
     flex-shrink: 0;
 }
 
 .author-details {
     flex: 1;
 }
 
 .author-name {
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     font-size: 1rem;
     margin-bottom: 0.25rem;
 }
 
 .author-meta {
     font-size: 0.85rem;
     color: var(--text-secondary);
 }
 
 .btn-follow {
     /*padding: 0.5rem 1.25rem;
     background: transparent;
     border: 2px solid var(--primary);
     color: var(--primary);
     border-radius: var(--ins-radius-s);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     transition: all 0.3s ease;
     font-size: 0.9rem;*/
     padding: 0.75rem 2rem;
     background: var(--primary);
     color: white;
     border: none;
     border-radius: var(--ins-radius-m);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     transition: all 0.3s ease;
     font-size: 1rem;
 }
 
 .btn-follow:hover {
     background: var(--primary);
     color: white;
 }
 /* Price Section */
 
 .price-section {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
     padding: 1.5rem;
 }
 
 .price-header {
     display: flex;
     justify-content: space-between;
     align-items: center;
     margin-bottom: 1rem;
 }
 
 .price-main {
     font-size: 2.5rem;
     font-weight: var(--weight-bold);
     color: var(--primary);
     font-family: var(--font-alt);
 }
 
 .price-license {
     background: var(--bg-tertiary);
     padding: 0.25rem 0.75rem;
     border-radius: var(--ins-radius-s);
     font-size: 0.85rem;
     color: var(--text-secondary);
 }
 
 .license-info {
     font-size: 0.9rem;
     color: var(--text-secondary);
     margin-bottom: 1.5rem;
     line-height: 1.5;
 }
 
 .license-info a {
     color: var(--primary);
     text-decoration: none;
 }
 
 .license-info a:hover {
     text-decoration: underline;
 }
 
 .purchase-actions {
     display: flex;
     flex-direction: column;
     gap: 0.75rem;
 }
 
 .btn-primary {
     padding: 1rem 2rem;
     background: var(--primary);
     color: white;
     border: none;
     border-radius: var(--ins-radius-m);
     font-weight: var(--weight-semibold);
     font-size: 1rem;
     cursor: pointer;
     transition: all 0.3s ease;
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 0.5rem;
 }
 
 .btn-primary:hover {
     background: var(--primary-dark);
     transform: translateY(-2px);
     box-shadow: var(--shadow-lg);
 }
 
 .btn-secondary {
     padding: 1rem 2rem;
     background: transparent;
     color: var(--text-primary);
     border: 2px solid var(--border);
     border-radius: var(--ins-radius-m);
     font-weight: var(--weight-semibold);
     font-size: 1rem;
     cursor: pointer;
     transition: all 0.3s ease;
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 0.5rem;
 }
 
 .btn-secondary:hover {
     border-color: var(--primary);
     color: var(--primary);
 }
 
 .quick-actions {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 0.75rem;
     margin-top: 1rem;
 }
 
 .btn-action {
     padding: 0.75rem 1rem;
     background: var(--bg-tertiary);
     color: var(--text-primary);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-s);
     font-weight: var(--weight-medium);
     font-size: 0.9rem;
     cursor: pointer;
     transition: all 0.3s ease;
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 0.5rem;
 }
 
 .btn-action:hover {
     background: var(--surface);
     border-color: var(--primary);
 }
 /* Action Section */
 
 .action-section {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
     padding: 1.5rem;
 }
 
 .quick-actions-full {
     display: grid;
     grid-template-columns: repeat(3, 1fr);
     gap: 0.75rem;
 }
 /* Tabs Section */
 
 .tabs-section {
     margin-bottom: 4rem;
 }
 
 .tabs-header {
     display: flex;
     gap: 0;
     border-bottom: 2px solid var(--border);
     margin-bottom: 2rem;
 }
 
 .tab-btn {
     padding: 1rem 2rem;
     background: transparent;
     border: none;
     color: var(--text-secondary);
     font-size: 1.1rem;
     font-weight: var(--weight-semibold);
     cursor: pointer;
     transition: all 0.3s ease;
     position: relative;
     border-bottom: 3px solid transparent;
 }
 
 .tab-btn:hover {
     color: var(--text-primary);
     background: var(--bg-secondary);
 }
 
 .tab-btn.active {
     color: var(--primary);
     border-bottom-color: var(--primary);
 }
 
 .tab-content {
     display: none;
     animation: fadeIn 0.4s ease;
 }
 
 .tab-content.active {
     display: block;
 }
 
 @keyframes fadeIn {
     from {
         opacity: 0;
         transform: translateY(10px);
     }
     to {
         opacity: 1;
         transform: translateY(0);
     }
 }
 
 .tab-panel {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     padding: 2rem;
 }
 /* Specifications */
 
 .specs-section {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-m);
     padding: 1.5rem;
 }
 
 .specs-title {
     font-size: 1.25rem;
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     margin-bottom: 1.25rem;
 }
 
 .specs-grid {
     display: grid;
     gap: 1rem;
 }
 
 .spec-item {
     display: flex;
     justify-content: space-between;
     padding: 0.75rem 0;
     border-bottom: 1px solid var(--border);
 }
 
 .spec-item:last-child {
     border-bottom: none;
 }
 
 .spec-label {
     color: var(--text-secondary);
     font-size: 0.9rem;
 }
 
 .spec-value {
     color: var(--text-primary);
     font-weight: var(--weight-medium);
     font-size: 0.9rem;
 }
 
 .spec-tag {
     display: inline-block;
     padding: 0.25rem 0.75rem;
     background: var(--bg-tertiary);
     border-radius: var(--ins-radius-s);
     font-size: 0.85rem;
     margin-left: 0.5rem;
 }
 /* Description Section */
 
 .description-section {
     margin-bottom: 3rem;
 }
 
 .section-title {
     font-size: 1.75rem;
     font-weight: var(--weight-bold);
     color: var(--text-primary);
     margin-bottom: 1.5rem;
     font-family: var(--font-alt);
 }
 
 .description-content {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     padding: 2rem;
 }
 
 .description-text {
     color: var(--text-secondary);
     line-height: 1.8;
     margin-bottom: 1.5rem;
     font-size: 1rem;
 }
 
 .features-list {
     list-style: none;
     padding: 0;
     margin: 1.5rem 0;
 }
 
 .features-list li {
     padding: 0.75rem 0;
     padding-left: 2rem;
     position: relative;
     color: var(--text-secondary);
     border-bottom: 1px solid var(--border);
 }
 
 .features-list li:last-child {
     border-bottom: none;
 }
 
 .features-list li::before {
     content: '✓';
     position: absolute;
     left: 0;
     color: var(--primary);
     font-weight: var(--weight-bold);
     font-size: 1.2rem;
 }
 
 .tags-container {
     display: flex;
     flex-wrap: wrap;
     gap: 0.5rem;
     margin-top: 1.5rem;
 }
 
 .tag {
     padding: 0.5rem 1rem;
     background: var(--bg-tertiary);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-s);
     color: var(--text-primary);
     font-size: 0.9rem;
     transition: all 0.3s ease;
     cursor: pointer;
 }
 
 .tag:hover {
     background: var(--surface);
     border-color: var(--primary);
     color: var(--primary);
 }
 /* Related Models Section */
 
 .related-section {
     margin-bottom: 4rem;
 }
 
 .related-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
     gap: 1.5rem;
 }
 
 .model-card {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     overflow: hidden;
     transition: all 0.3s ease;
     cursor: pointer;
 }
 
 .model-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow-lg);
     border-color: var(--primary);
 }
 
 .model-image {
     aspect-ratio: 16/10;
     position: relative;
     overflow: hidden;
 }
 
 .model-badge {
     position: absolute;
     top: 0.75rem;
     left: 0.75rem;
     padding: 0.375rem 0.75rem;
     background: rgba(0, 0, 0, 0.7);
     backdrop-filter: blur(10px);
     color: white;
     font-size: 0.75rem;
     font-weight: 600;
     border-radius: var(--ins-radius-s);
 }
 
 .model-badge.premium {
     background: rgba(8, 121, 145, 0.9);
     color: white;
 }
 
 .model-badge.free {
     background: rgba(67, 233, 123, 0.9);
     color: white;
 }
 
 .model-actions {
     position: absolute;
     top: 1rem;
     left: 1rem;
     display: flex;
     gap: 0.5rem;
     opacity: 0;
     transition: opacity 0.3s ease;
 }
 
 .model-card:hover .model-actions {
     opacity: 1;
 }
 
 .action-btn {
     width: 40px;
     height: 40px;
     background: rgba(0, 0, 0, 0.7);
     backdrop-filter: blur(10px);
     color: white;
     border: none;
     border-radius: 50%;
     cursor: pointer;
     transition: all 0.3s ease;
     display: flex;
     align-items: center;
     justify-content: center;
 }
 
 .action-btn:hover {
     background: rgba(8, 121, 145, 0.9);
     transform: scale(1.1);
 }
 
 .model-info {
     padding: 1.25rem;
 }
 
 .model-title {
     font-size: 1.1rem;
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     margin-bottom: 0.75rem;
 }
 
 .model-author {
     display: flex;
     align-items: center;
     gap: 0.5rem;
     margin-bottom: 1rem;
 }
 
 .model-author-avatar {
     width: 24px;
     height: 24px;
     border-radius: 50%;
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 0.75rem;
 }
 
 .model-author-name {
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 
 .model-meta {
     display: flex;
     justify-content: space-between;
     align-items: center;
 }
 
 .model-meta {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding-top: 0.75rem;
     border-top: 1px solid var(--border);
 }
 
 .model-price {
     font-weight: var(--weight-bold);
     color: var(--primary);
     font-size: 1.1rem;
 }
 
 .model-price.free {
     color: var(--success);
 }
 
 .model-stats {
     display: flex;
     gap: 1rem;
     font-size: 0.85rem;
     color: var(--text-secondary);
 }
 /* Reviews Section */
 
 .reviews-section {
     margin-bottom: 4rem;
 }
 
 .reviews-header {
     display: flex;
     justify-content: space-between;
     align-items: center;
     margin-bottom: 2rem;
 }
 
 .reviews-summary {
     display: flex;
     align-items: center;
     gap: 2rem;
 }
 
 .reviews-rating {
     text-align: center;
 }
 
 .reviews-rating-number {
     font-size: 3rem;
     font-weight: var(--weight-bold);
     color: var(--text-primary);
     font-family: var(--font-alt);
 }
 
 .reviews-rating-stars {
     color: var(--warning);
     font-size: 1.2rem;
     margin: 0.5rem 0;
 }
 
 .reviews-rating-count {
     color: var(--text-secondary);
     font-size: 0.9rem;
 }
 
 .reviews-bars {
     flex: 1;
 }
 
 .review-bar-item {
     display: flex;
     align-items: center;
     gap: 1rem;
     margin-bottom: 0.5rem;
 }
 
 .review-bar-label {
     font-size: 0.85rem;
     color: var(--text-secondary);
     min-width: 60px;
 }
 
 .review-bar {
     flex: 1;
     height: 8px;
     background: var(--bg-tertiary);
     border-radius: 10px;
     overflow: hidden;
 }
 
 .review-bar-fill {
     height: 100%;
     background: var(--warning);
     border-radius: 10px;
 }
 
 .review-bar-count {
     font-size: 0.85rem;
     color: var(--text-secondary);
     min-width: 40px;
     text-align: right;
 }
 
 .btn-write-review {
     padding: 0.75rem 1.5rem;
     background: var(--primary);
     color: white;
     border: none;
     border-radius: var(--ins-radius-m);
     font-weight: var(--weight-semibold);
     cursor: pointer;
     transition: all 0.3s ease;
 }
 
 .btn-follow {
     background: transparent;
     border: 2px solid var(--primary);
     color: var(--primary);
     border-radius: var(--ins-radius-s);
     cursor: pointer;
     font-weight: var(--weight-semibold);
     font-size: 0.9rem;
     transition: all 0.3s ease;
 }
 
 .btn-follow:hover {
     background: var(--primary);
     color: white;
 }
 
 .btn-follow.following {
     background: var(--primary);
     color: white;
 }
 
 .btn-write-review:hover {
     background: var(--primary-dark);
     transform: translateY(-2px);
 }
 
 .reviews-list {
     display: flex;
     flex-direction: column;
     gap: 1.5rem;
 }
 
 .review-card {
     background: var(--surface);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-l);
     padding: 1.5rem;
 }
 
 .review-header {
     display: flex;
     justify-content: space-between;
     align-items: start;
     margin-bottom: 1rem;
 }
 
 .review-author {
     display: flex;
     align-items: center;
     gap: 1rem;
 }
 
 .review-author-avatar {
     width: 45px;
     height: 45px;
     border-radius: 50%;
     background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
     display: flex;
     align-items: center;
     justify-content: center;
     font-size: 1.25rem;
     flex-shrink: 0;
 }
 
 .review-author-info {
     display: flex;
     flex-direction: column;
 }
 
 .review-author-name {
     font-weight: var(--weight-semibold);
     color: var(--text-primary);
     font-size: 1rem;
 }
 
 .review-date {
     font-size: 0.85rem;
     color: var(--text-secondary);
 }
 
 .review-rating {
     color: var(--warning);
     font-size: 1rem;
 }
 
 .review-content {
     color: var(--text-secondary);
     line-height: 1.7;
     margin-bottom: 1rem;
 }
 
 .review-helpful {
     display: flex;
     align-items: center;
     gap: 1rem;
     padding-top: 1rem;
     border-top: 1px solid var(--border);
 }
 
 .review-helpful-text {
     font-size: 0.9rem;
     color: var(--text-secondary);
 }
 
 .review-helpful-buttons {
     display: flex;
     gap: 0.5rem;
 }
 
 .btn-helpful {
     padding: 0.4rem 0.75rem;
     background: var(--bg-tertiary);
     border: 1px solid var(--border);
     border-radius: var(--ins-radius-s);
     color: var(--text-primary);
     cursor: pointer;
     transition: all 0.3s ease;
     font-size: 0.85rem;
 }
 
 .btn-helpful:hover {
     background: var(--surface);
     border-color: var(--primary);
     color: var(--primary);
 }
 /* Footer */
 
 footer {
     background: var(--surface);
     border-top: 1px solid var(--border);
     padding: 2rem 0;
     text-align: center;
     color: var(--text-secondary);
     font-size: 0.9rem;
 }
 /* Responsive */
 
 @media (max-width: 1200px) {
     .product-layout {
         grid-template-columns: 1fr;
         gap: 2rem;
     }
     .viewer-section {
         position: relative;
         top: 0;
     }
     .product-info {
         max-width: 600px;
         margin: 0 auto;
     }
 }
 
 @media (max-width: 768px) {
     .nav-container {
         flex-wrap: wrap;
     }
     .search-bar-nav {
         order: 3;
         max-width: 100%;
         margin: 1rem 0 0 0;
         width: 100%;
     }
     .main-content {
         padding: 1rem;
     }
     .product-title {
         font-size: 1.5rem;
     }
     .related-grid {
         grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
     }
     .reviews-summary {
         flex-direction: column;
         align-items: flex-start;
     }
     .reviews-header {
         flex-direction: column;
         gap: 1rem;
     }
     .quick-actions-full {
         grid-template-columns: 1fr;
     }
     .tabs-header {
         flex-wrap: wrap;
     }
     .tab-btn {
         flex: 1;
         min-width: 120px;
         padding: 0.75rem 1rem;
         font-size: 0.95rem;
     }
 }