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

:root {
    --primary-color: #000000;
    --secondary-color: #f5f5f5;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --accent-color: #000000;
    --hover-color: #333333;
    --background: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background-color: var(--background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.main-content .container {
    padding: 0;
}

/* 页面切换 */
.page {
    display: none;
    min-height: 100vh;
}

.page.active {
    display: block;
}

/* 主页样式 */
.product-image-section {
    padding: 50px 0 40px 0;
    background: var(--background);
}

.product-image-wrapper {
    max-width: 500px;
    margin: 0 auto;
    background: var(--background);
    overflow: hidden;
}

.product-main-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
}

.product-header {
    padding: 30px 0 40px 0;
    border-bottom: none;
}

.product-title-section {
    text-align: center;
}

.product-name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    text-transform: uppercase;
    color: var(--text-primary);
}

.product-subtitle {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: none;
    line-height: 1.5;
}

.product-id {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    font-family: 'Courier New', monospace;
}

/* 导航按钮 */
.main-content {
    padding: 0;
    margin-top: 0;
}

.nav-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    margin: 0;
    padding: 0 40px 40px 40px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.nav-button {
    width: 100%;
    padding: 18px 32px;
    background: #f5f5f5;
    border: none;
    border-radius: 0;
    text-align: left;
    cursor: pointer;
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: background-color 0.2s ease;
    text-transform: capitalize;
    letter-spacing: 0.03em;
    position: relative;
    margin: 0;
    font-family: inherit;
    box-shadow: none;
}

.nav-button:hover {
    background-color: #e8e8e8;
}

.nav-button:active {
    background-color: #d8d8d8;
}

/* 详情页样式 */
.detail-page {
    background: var(--background);
}

.detail-header {
    position: sticky;
    top: 0;
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 40px;
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 100;
}

.back-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--secondary-color);
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s;
}

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

.back-button svg {
    width: 20px;
    height: 20px;
}

.detail-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-transform: capitalize;
    letter-spacing: 0.05em;
}

.detail-content {
    padding: 40px 0;
}

/* Digital Twin 详情页 */
.video-section {
    margin-bottom: 40px;
}

.video-wrapper {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    background: var(--secondary-color);
    border-radius: 8px;
    overflow: hidden;
}

.product-video,
.digital-twin-image {
    width: 100%;
    height: auto;
    display: block;
}

.info-cards-section,
.social-share-section,
.nft-section {
    margin-bottom: 60px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-cards-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.info-card {
    padding: 20px;
    background: var(--secondary-color);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
}

.social-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.social-btn {
    padding: 15px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: opacity 0.3s;
}

.social-btn:hover {
    opacity: 0.9;
}

.social-btn.instagram {
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}

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

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

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

.social-btn svg {
    width: 20px;
    height: 20px;
}

.nft-info {
    background: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
}

.nft-info p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.nft-price {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.nft-button {
    width: 100%;
    padding: 15px 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

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

/* Authentication 详情页 */
.authentication-container {
    max-width: 600px;
    margin: 0 auto;
}

.auth-verification-section {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
}

.verified-icon-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: #28a745;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.verified-icon-circle svg {
    width: 48px;
    height: 48px;
}

.verified-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.verified-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

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

.info-card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
    text-transform: capitalize;
}

.info-card {
    background: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
}

.info-card-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    gap: 15px;
}

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

.info-label {
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
    min-width: 150px;
}

.info-value {
    font-weight: 400;
    color: var(--text-primary);
    text-align: right;
    flex: 1;
    word-wrap: break-word;
    line-height: 1.6;
}

.info-value-block {
    flex: 1;
    text-align: right;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}

.info-subsection {
    width: 100%;
    text-align: left;
    margin-bottom: 12px;
}

.info-subsection:last-child {
    margin-bottom: 0;
}

.info-subtitle {
    display: block;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.info-description {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
    font-weight: 400;
    text-align: left;
    max-width: 100%;
}

.verified-status {
    color: #28a745;
}

.transfer-section {
    margin-top: 40px;
    padding-bottom: 40px;
}

.transfer-button {
    width: 100%;
    padding: 18px 30px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.transfer-button:hover {
    background: #218838;
}

/* Product Info 详情页 */
.product-info-page-container {
    max-width: 800px;
    margin: 0 auto;
}

.product-image-section-info {
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.product-main-image-info {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
    margin-bottom: 20px;
    border-radius: 8px;
}

.product-thumbnails {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.thumbnail-item {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.3s;
}

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

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

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

.product-name-info {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-model-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.info-section-card {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.section-title-info {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: capitalize;
}

.overview-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

.price-weight-section {
    display: flex;
    gap: 30px;
    margin-bottom: 25px;
}

.price-weight-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.price-weight-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.price-weight-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.color-swatches {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.color-swatch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 5px;
    border-radius: 8px;
    transition: background 0.3s;
}

.color-swatch:hover {
    background: var(--secondary-color);
}

.color-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.color-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.specifications-content {
    margin-top: 20px;
}

.spec-subsection {
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.spec-subsection:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.spec-subtitle {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: capitalize;
}

.spec-group {
    margin-bottom: 20px;
}

.spec-group strong {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.spec-group ul {
    margin: 10px 0;
    padding-left: 20px;
}

.spec-group li {
    margin-bottom: 5px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.spec-group p {
    margin-bottom: 8px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Supply Chain 详情页 */
.supply-chain-container {
    max-width: 800px;
    margin: 0 auto;
}

.supply-chain-info-list,
.carbon-emission-info {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* Sustainability 详情页 */
.sustainability-container {
    max-width: 800px;
    margin: 0 auto;
}

.sustainability-info-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 20px;
}

.certifications-display {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.certification-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.certification-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.certification-icon.iso {
    background: #1877f2;
}

.certification-icon.eco {
    background: #28a745;
}

.iso-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    text-align: center;
    padding: 10px;
    line-height: 1.3;
}

.iso-badge span {
    display: block;
}

.eco-badge {
    font-size: 3rem;
    color: white;
}

.certification-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
}

.commitment-content {
    margin-top: 15px;
}

.commitment-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

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

.commitment-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    line-height: 1.6;
    position: relative;
    padding-left: 20px;
}

.commitment-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.philosophy-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

/* Care Guide 详情页 */
.care-guide-container {
    max-width: 800px;
    margin: 0 auto;
}

.care-instructions-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.care-instruction-item {
    padding: 15px 0;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
}

.care-instruction-item.has-border {
    border-bottom: 1px solid var(--border-color);
}

.recycling-program-content {
    margin-top: 15px;
}

.recycling-intro {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 15px;
}

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

.recycling-benefits li {
    padding: 8px 0;
    color: var(--text-secondary);
    line-height: 1.6;
    position: relative;
    padding-left: 20px;
}

.recycling-benefits li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* 页脚 */
.footer {
    border-top: none;
    margin-top: 40px;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 60px;
}

/* 响应式设计 */
/* 平板和中等屏幕 (1024px 及以下) */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }

    .nav-buttons {
        padding: 0 30px 30px 30px;
    }

    .product-image-wrapper {
        max-width: 450px;
    }

    .detail-header {
        padding: 15px 30px;
    }
}

/* 平板和小屏幕 (768px 及以下) */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .product-image-section {
        padding: 30px 0 20px 0;
    }

    .product-image-wrapper {
        max-width: 100%;
        padding: 0 10px;
    }

    .product-header {
        padding: 20px 0 25px 0;
    }

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

    .product-subtitle {
        font-size: 0.8rem;
    }

    .product-id {
        font-size: 0.8rem;
    }

    .nav-buttons {
        padding: 0 20px 25px 20px;
        gap: 10px;
    }

    .nav-button {
        padding: 18px 20px;
        font-size: 0.95rem;
    }

    .detail-header {
        padding: 15px 20px;
    }

    .detail-title {
        font-size: 1.25rem;
    }

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

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

    .detail-content {
        padding: 30px 0;
    }

    .info-section-card {
        padding: 20px;
    }

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

    .product-thumbnails {
        gap: 10px;
    }

    .thumbnail-item {
        width: 60px;
        height: 60px;
    }

    .info-label {
        min-width: 120px;
        font-size: 0.875rem;
    }

    .info-value {
        font-size: 0.9rem;
    }

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

/* 手机屏幕 (480px 及以下) */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .product-image-section {
        padding: 25px 0 15px 0;
    }

    .product-image-wrapper {
        padding: 0 5px;
    }

    .product-header {
        padding: 15px 0 20px 0;
    }

    .product-name {
        font-size: 1.2rem;
        margin-bottom: 6px;
    }

    .product-subtitle {
        font-size: 0.75rem;
        margin-bottom: 6px;
    }

    .product-id {
        font-size: 0.75rem;
    }

    .nav-buttons {
        padding: 0 15px 20px 15px;
        gap: 8px;
    }

    .nav-button {
        padding: 16px 15px;
        font-size: 0.9rem;
    }

    .detail-header {
        padding: 12px 15px;
    }

    .back-button {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .detail-title {
        font-size: 1.1rem;
    }

    .section-title-info {
        font-size: 1rem;
    }

    .info-label {
        min-width: 100px;
        font-size: 0.8rem;
    }

    .info-value {
        font-size: 0.85rem;
    }

    .product-name-info {
        font-size: 1.5rem;
    }

    .price-weight-value {
        font-size: 1.25rem;
    }

    .thumbnail-item {
        width: 50px;
        height: 50px;
    }

    .verified-icon-circle {
        width: 60px;
        height: 60px;
    }

    .verified-icon-circle svg {
        width: 36px;
        height: 36px;
    }

    .verified-title {
        font-size: 1.25rem;
    }

    .certification-icon {
        width: 80px;
        height: 80px;
    }

    .iso-badge {
        font-size: 0.6rem;
    }

    .eco-badge {
        font-size: 2rem;
    }
}