* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Home Page Styles */
body.home-page {
    background: var(--bg-primary);
    min-height: 100vh;
    padding: 40px 20px;
}

.home-container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--bg-primary);
}

.product-image-section {
    text-align: center;
    margin-bottom: 40px;
}

.product-image-3d {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder-large {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.image-placeholder-large svg {
    color: var(--text-secondary);
    opacity: 0.3;
}

.product-main-image {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius);
    margin: 0 auto;
    display: block;
}

.product-title-section {
    text-align: center;
    margin-bottom: 40px;
}

.product-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.product-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.product-id {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.nav-button {
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-sm);
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
    display: block;
}

.nav-button:hover {
    background: var(--border-color);
    transform: translateY(-1px);
}

/* Page Styles (for sub-pages) */
body.page-body {
    background: var(--bg-tertiary);
    min-height: 100vh;
    padding: 20px;
}

.page-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.page-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    position: relative;
}

.back-button {
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--radius-sm);
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.back-button:hover {
    background: var(--border-color);
}

.page-title {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Digital Twin Page */
.video-section {
    margin-bottom: 30px;
}

.video-player {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: #1f2937;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    gap: 12px;
}

.video-placeholder svg {
    width: 60px;
    height: 60px;
    opacity: 0.7;
}

.product-video {
    width: 100%;
    aspect-ratio: 16/9;
    background: #1f2937;
    border-radius: var(--radius-sm);
    display: block;
}

.video-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.control-btn {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    padding: 4px 8px;
}

.time {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: auto;
}

.info-section {
    margin-bottom: 30px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.feature-boxes {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-box {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 16px;
    font-size: 14px;
    color: var(--text-primary);
}

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

.social-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.social-btn.instagram {
    background: linear-gradient(135deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    color: white;
}

.social-btn.facebook {
    background: #1877f2;
    color: white;
}

.social-btn.tiktok {
    background: #000000;
    color: white;
}

.social-btn.twitter {
    background: #1da1f2;
    color: white;
}

.social-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nft-info {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 20px;
}

.nft-info p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.nft-price {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 16px;
}

.nft-button {
    width: 100%;
    background: #000000;
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 14px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    margin-top: 16px;
    transition: all 0.2s ease;
}

.nft-button:hover {
    background: #333333;
}

/* Authentication Page */
.verification-section {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

.verified-icon {
    width: 80px;
    height: 80px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 40px;
    color: white;
    font-weight: 700;
}

.verified-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.verified-text {
    font-size: 16px;
    color: var(--text-secondary);
}

.info-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 24px;
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.card-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 500;
    color: var(--text-primary);
}

.info-value {
    color: var(--text-secondary);
}

.verified-badge {
    background: var(--secondary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.transfer-button {
    width: 100%;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 20px;
    transition: all 0.2s ease;
}

.transfer-button:hover {
    background: #059669;
}

/* Product Info Page */
.product-images-section {
    margin-bottom: 30px;
}

.main-product-image {
    margin-bottom: 16px;
}

.product-image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image-placeholder svg {
    color: var(--text-secondary);
    opacity: 0.3;
}

.product-main-image-view {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-sm);
    display: block;
}

.thumbnail-images {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.thumbnail {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
}

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

.thumbnail-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-tertiary);
}

.thumbnail-placeholder.gray {
    background: #9ca3af;
}

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

.product-name-section {
    margin-bottom: 30px;
}

.product-name-large {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.product-model {
    font-size: 14px;
    color: var(--text-secondary);
}

.overview-text {
    color: var(--text-secondary);
    line-height: 1.8;
}

.price-weight-section {
    display: flex;
    gap: 40px;
    margin-bottom: 30px;
    padding: 20px 0;
}

.price-weight-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.price-weight-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.price-weight-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.color-swatches {
    display: flex;
    gap: 24px;
}

.color-swatch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.color-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.color-circle.black {
    background: #000000;
}

.color-circle.sage-green {
    background: #87ae73;
}

.color-circle.cream-white {
    background: #f5f5dc;
    border: 1px solid #e0e0d0;
}

.size-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.size-guide-link {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
}

.size-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.size-btn {
    flex: 1;
    min-width: 60px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.size-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.feature-tag {
    background: var(--bg-tertiary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-primary);
}

.spec-box {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 16px;
}

.spec-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.spec-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.spec-content p {
    margin-bottom: 8px;
    font-weight: 500;
}

.spec-content ul {
    margin-left: 20px;
    margin-bottom: 16px;
}

.spec-content li {
    margin-bottom: 4px;
}

/* Supply Chain Page */
.main-card {
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 24px;
}

.card-section {
    margin-bottom: 30px;
}

.card-section:last-child {
    margin-bottom: 0;
}

.card-section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px 0;
}

.info-item-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.info-item-value {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.info-item-value br {
    display: block;
    margin: 4px 0;
}

.divider {
    height: 1px;
    background: var(--border-color);
}

.circularity-content {
    padding: 16px 0;
}

.circularity-text {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.circularity-text:last-child {
    margin-bottom: 0;
}

/* Sustainability Page */
.sustainability-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sustainability-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sustainability-item.full-width {
    margin-top: 8px;
}

.sustainability-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.sustainability-value {
    color: var(--text-secondary);
    font-size: 14px;
}

.sustainability-value p {
    margin-bottom: 4px;
}

.sustainability-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-top: 8px;
}

.certification-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.certification-card {
    text-align: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 24px;
}

.cert-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-circle {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: #2563eb;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.recycle-symbol {
    font-size: 48px;
    color: #10b981;
}

.cert-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.commitment-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 24px;
}

.commitment-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.commitment-list {
    list-style: none;
    padding-left: 0;
}

.commitment-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
}

.commitment-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 20px;
}

/* Care Guide Page */
.care-card {
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
}

.care-list {
    display: flex;
    flex-direction: column;
}

.care-item {
    padding: 12px 0;
    color: var(--text-primary);
    font-size: 14px;
}

.recycling-intro {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 14px;
}

.recycling-list {
    list-style: none;
    padding-left: 0;
}

.recycling-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
    font-size: 14px;
}

.recycling-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .page-container {
        padding: 16px;
    }

    .product-title {
        font-size: 24px;
    }

    .social-buttons {
        grid-template-columns: 1fr;
    }

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

    .price-weight-section {
        flex-direction: column;
        gap: 20px;
    }
}