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;
}


/* 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%;
    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;
}

.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;
}


/* 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-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;
    }
}

.tab-panel h2,
.tab-panel h3 {
    font-family: Arial, sans-serif;
    color: var(--text-primary) !important;
    margin: 2rem 0 1rem 0;
}

.tab-panel P {
    color: var(--text-secondary) !important;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.tab-panel li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}