/* =========================================================
   万物OOP 
   作者：Json
   ========================================================= */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-bg: #f5f7fb;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.1);
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ============ 顶部导航 ============ */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: 1px;
}

.nav-menu .main-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.menu-item a {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
}

.menu-item a:hover,
.menu-item a.active {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.08);
}

/* ============ 主内容 ============ */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-6) var(--spacing-4) var(--spacing-8);
}

/* ============ 搜索区域 ============ */
.search-container {
    margin-bottom: var(--spacing-6);
}

.search-box {
    display: flex;
    max-width: 640px;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-box:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 12px 20px;
    font-size: var(--text-base);
    color: var(--color-text);
    background: transparent;
}

.search-button {
    border: none;
    background: var(--color-primary);
    color: #fff;
    padding: 0 28px;
    font-size: var(--text-base);
    cursor: pointer;
    transition: background 0.2s ease;
}

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

/* ============ 分类筛选 ============ */
.filter-bar {
    margin-top: var(--spacing-6);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-4);
    box-shadow: var(--shadow);
}

.filter-row {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
}

.filter-row + .filter-row {
    margin-top: var(--spacing-3);
    padding-top: var(--spacing-3);
    border-top: 1px dashed var(--color-border);
}

.filter-label {
    flex-shrink: 0;
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    line-height: 32px;
    min-width: 40px;
}

.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.filter-tags a {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border: 1px solid transparent;
    transition: all 0.2s ease;
    line-height: 22px;
}

.filter-tags a:hover {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.08);
}

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

/* ============ 产品卡片网格 ============ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-4);
}

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.product-card a {
    display: block;
}

.product-image {
    width: 100%;
    aspect-ratio: 16 / 10;
    background: #eef1f6;
    overflow: hidden;
}

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

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
    padding: var(--spacing-3) var(--spacing-4) 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.8em;
}

.product-meta {
    padding: var(--spacing-2) var(--spacing-4) var(--spacing-4);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.industry {
    font-size: 12px;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border-radius: 4px;
    padding: 2px 8px;
}

/* ============ 空态 ============ */
.search-empty-state {
    text-align: center;
    padding: var(--spacing-8) 0;
    color: var(--color-text-secondary);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-3);
}

.search-empty-state h3 {
    font-size: var(--text-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-2);
}

.search-empty-state p {
    color: var(--color-text-tertiary);
}

/* ============ 底部 ============ */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-6) 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    text-align: center;
}

.icp-info a {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    transition: color 0.2s ease;
}

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

/* ============ 响应式 ============ */
@media (max-width: 768px) {
    .nav-container {
        height: auto;
        min-height: 56px;
        flex-wrap: wrap;
        padding: var(--spacing-2) var(--spacing-3);
        gap: var(--spacing-1);
    }

    .logo a {
        font-size: var(--text-xl);
    }

    .nav-menu .main-menu {
        gap: var(--spacing-1);
        flex-wrap: wrap;
    }

    .menu-item a {
        padding: var(--spacing-1) var(--spacing-2);
        font-size: var(--text-sm);
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: var(--spacing-3);
    }

    .search-button {
        padding: 0 18px;
    }
}

/* ============ 学习文档（书籍列表） ============ */
.book-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-4);
}

.book-card-link {
    display: block;
}

.book-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    height: 100%;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.book-cover {
    aspect-ratio: 4 / 2.9;
    overflow: hidden;
    background: #eef1f6;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
    transform: scale(1.05);
}

.book-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    padding: var(--spacing-3);
}

.book-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-2);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-top: auto;
}

.book-pages,
.book-type-tag {
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border-radius: 4px;
    padding: 2px 8px;
    white-space: nowrap;
}

/* ============ 文档详情 ============ */
.document-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.document-info {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-6);
    box-shadow: var(--shadow);
}

.document-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-4);
    line-height: 1.4;
}

.document-attributes {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.document-attributes .attribute {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    padding: 4px 10px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.document-attributes .attribute .label {
    color: var(--color-text-tertiary);
    font-weight: 500;
    white-space: nowrap;
}

.document-attributes .attribute .value {
    color: var(--color-text);
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.action-buttons button {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.action-buttons button:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.contact-btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
}

.open-goods {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.open-goods:hover {
    background: rgba(37, 99, 235, 0.08);
    border-color: var(--color-primary);
}

.document-screenshots {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-6);
    box-shadow: var(--shadow);
}

.screenshots-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid var(--color-border);
}

.screenshot-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
}

.screenshot-item {
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #eef1f6;
    aspect-ratio: 3 / 4;
    cursor: zoom-in;
    transition: opacity 0.2s ease;
}

.screenshot-item:hover {
    opacity: 0.92;
}

.screenshot-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ============ 平台资讯（文章列表/详情） ============ */
.article-container {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: var(--spacing-6);
    align-items: start;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.article-list > a {
    display: block;
    transition: transform 0.2s ease;
}

.article-list > a:hover {
    transform: translateX(2px);
}

.article-card {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: var(--spacing-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-hover);
}

.article-image {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: #eef1f6;
}

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

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-content {
    padding: var(--spacing-3) var(--spacing-4) var(--spacing-3) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
}

.article-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-1);
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-summary {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--spacing-2);
}

.article-meta {
    display: flex;
    gap: var(--spacing-3);
    font-size: 12px;
    color: var(--color-text-tertiary);
}

.tag-cloud {
    position: sticky;
    top: 80px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-4);
    box-shadow: var(--shadow);
}

.tag-cloud h2 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--color-border);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border-radius: 4px;
    transition: color 0.2s ease, background 0.2s ease;
}

.tag:hover {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.08);
}

/* 文章详情 */
.article-detail {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-6);
    box-shadow: var(--shadow);
}

.article-detail .article-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-3);
    line-height: 1.35;
    -webkit-line-clamp: unset;
}

.article-detail .article-meta {
    display: flex;
    gap: var(--spacing-3);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-5);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.article-detail .article-meta a {
    color: var(--color-primary);
    font-weight: 500;
}

.article-cover {
    margin-bottom: var(--spacing-5);
    border-radius: var(--radius);
    overflow: hidden;
}

.article-cover img {
    width: 100%;
    border-radius: var(--radius);
    display: block;
}

.article-detail .article-content {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: 1.8;
    word-break: break-word;
}

.article-detail .article-content p {
    margin-bottom: var(--spacing-4);
}

.article-detail .article-content h1,
.article-detail .article-content h2,
.article-detail .article-content h3,
.article-detail .article-content h4 {
    color: var(--color-text);
    margin-top: var(--spacing-6);
    margin-bottom: var(--spacing-2);
}

.article-detail .article-content h2 {
    font-size: var(--text-xl);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--color-border);
}

.article-detail .article-content img {
    border-radius: var(--radius-sm);
    margin: var(--spacing-3) 0;
    max-width: 100%;
}

.article-detail .article-content ul,
.article-detail .article-content ol {
    padding-left: var(--spacing-6);
    margin-bottom: var(--spacing-4);
}

.article-detail .article-content li {
    margin-bottom: var(--spacing-1);
    list-style: disc;
}

.article-detail .article-content code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.875em;
    padding: 2px 4px;
    background: var(--color-bg);
    border-radius: 4px;
    color: var(--color-primary);
}

.article-detail .article-content pre {
    background: var(--color-text);
    color: #e0e0e0;
    padding: var(--spacing-4);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: var(--spacing-3) 0;
}

.article-detail .article-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.article-detail .article-content blockquote {
    border-left: 3px solid var(--color-primary);
    padding: var(--spacing-2) var(--spacing-4);
    margin: var(--spacing-3) 0;
    background: rgba(37, 99, 235, 0.06);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-secondary);
}

/* ============ AI答疑 ============ */
.ai-page-content {
    display: flex;
    justify-content: center;
    padding: var(--spacing-8) var(--spacing-4);
}

.ai-container {
    display: flex;
    justify-content: center;
    width: 100%;
    max-width: 1200px;
    flex-wrap: wrap;
    gap: var(--spacing-6);
}

.ai-card {
    background: var(--color-surface);
    width: 300px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    text-align: left;
    padding: var(--spacing-4);
    position: relative;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.ai-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-hover);
}

.ai-card img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.ai-card h3 {
    margin-top: var(--spacing-3);
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text);
}

.ai-card p {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin: var(--spacing-2) 0;
    line-height: 1.6;
}

.ai-card p strong {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.ai-card button {
    background-color: var(--color-primary);
    color: #fff;
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    margin-top: auto;
    align-self: flex-start;
    cursor: pointer;
    border: none;
    transition: background 0.2s ease;
}

.ai-card button:hover {
    background-color: var(--color-primary-hover);
}

/* 图片/二维码模态框 */
.image-modal,
.qrcode-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    z-index: 400;
    justify-content: center;
    align-items: center;
}

.image-modal .close-modal,
.qrcode-modal .close-modal {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    color: #fff;
    font-size: 28px;
    cursor: pointer;
    line-height: 1;
}

.modal-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: var(--radius);
}

.qrcode-container1 {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: var(--spacing-6);
    text-align: center;
    position: relative;
    max-width: 300px;
    width: 90%;
}

.qrcode-container1 .close-modal {
    color: var(--color-text-tertiary);
    top: var(--spacing-2);
    right: var(--spacing-3);
    font-size: 20px;
}

.qrcode-image-wrapper {
    width: 160px;
    height: 160px;
    margin: 0 auto var(--spacing-3);
}

.qrcode-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.qrcode-tip {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* 响应式补充 */
@media (max-width: 768px) {
    .book-list {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-3);
    }

    .article-container {
        grid-template-columns: 1fr;
    }

    .tag-cloud {
        position: relative;
        top: 0;
    }

    .article-card {
        grid-template-columns: 1fr;
    }

    .article-image {
        aspect-ratio: 16 / 9;
    }

    .article-content {
        padding: var(--spacing-3);
    }

    .screenshot-list {
        grid-template-columns: 1fr;
    }

    .ai-card {
        width: 100%;
        max-width: 360px;
    }
}

/* ============ 固定悬浮功能区 ============ */
.float-buttons {
    position: fixed;
    right: var(--spacing-3);
    bottom: var(--spacing-6);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.float-button {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    position: relative;
}

.float-button:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-hover);
}

.float-button img {
    width: 18px;
    height: 18px;
    object-fit: contain;
    border-radius: 0;
}

.float-button .qrcode-container {
    position: absolute;
    right: calc(100% + var(--spacing-2));
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: var(--spacing-2);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--color-border);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    pointer-events: none;
    width: 144px;
    height: 144px;
}

.float-button:hover .qrcode-container {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.float-button .qrcode-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

#toTopBtn {
    opacity: 0;
    visibility: hidden;
    background: var(--color-text);
    border-color: var(--color-text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, opacity 0.25s ease, visibility 0.25s ease;
}

#toTopBtn.visible {
    opacity: 1;
    visibility: visible;
}

/* ============ 产品详情 ============ */
.product-detail {
    padding-top: var(--spacing-4);
}

.product-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.product-gallery {
    align-self: start;
}

.gallery-main {
    border-radius: var(--radius);
    overflow: hidden;
    background: #eef1f6;
    aspect-ratio: 4 / 3;
    cursor: zoom-in;
    margin-bottom: var(--spacing-2);
}

.gallery-main .main-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.25s ease;
}

.gallery-main:hover .main-image {
    transform: scale(1.015);
}

.gallery-thumbs {
    display: flex;
    gap: var(--spacing-2);
    overflow-x: auto;
    padding-bottom: var(--spacing-1);
}

.gallery-thumbs .thumb {
    width: 60px;
    height: 45px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s ease, border-color 0.2s ease;
    flex-shrink: 0;
}

.gallery-thumbs .thumb:hover {
    opacity: 0.75;
}

.gallery-thumbs .thumb.active {
    border-color: var(--color-primary);
    opacity: 1;
}

.product-info {
    display: flex;
    flex-direction: column;
}

.product-info .product-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text);
    padding: 0;
    margin-bottom: var(--spacing-4);
    line-height: 1.35;
    white-space: normal;
    overflow: visible;
    -webkit-line-clamp: unset;
}

.product-attributes {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.product-attributes .attribute {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
    padding: 6px 12px;
    background: #eef4ff;
    border-radius: var(--radius-sm);
}

.product-attributes .attribute .label {
    color: var(--color-text-tertiary);
    font-weight: 500;
    white-space: nowrap;
    min-width: 72px;
}

.product-attributes .attribute .value {
    color: var(--color-text);
    font-weight: 500;
}

.disclaimer {
    font-size: 12px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-4);
    padding: var(--spacing-2) var(--spacing-3);
    background: rgba(37, 99, 235, 0.06);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary);
}

.notice-section {
    margin-top: var(--spacing-3);
    padding: var(--spacing-4);
    background: #eef4ff;
    border-radius: var(--radius-sm);
    border: 1px solid #dbe7ff;
}

.notice-section .notice-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}

.notice-section .notice-header h2 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0;
}

.notice-section .notice-toggle {
    font-size: 12px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-left: var(--spacing-2);
}

.notice-section .notice-body {
    overflow: hidden;
    max-height: 500px;
    transition: max-height 0.25s ease, margin-top 0.25s ease;
    margin-top: var(--spacing-2);
    position: relative;
}

.notice-section.collapsed .notice-body {
    max-height: 58px;
}

.notice-section.collapsed .notice-body::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 24px;
    background: linear-gradient(transparent, #eef4ff);
    pointer-events: none;
}

.notice-section p {
    font-size: 12px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.action-buttons button {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.action-buttons button:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

.preview-btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
}

.qrcode-btn {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.qrcode-btn:hover {
    background: rgba(37, 99, 235, 0.08);
    border-color: var(--color-primary);
}

.openDos-btn {
    background: var(--color-text);
    color: #fff;
    border: none;
}

.product-description {
    grid-column: 1 / -1;
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: var(--spacing-6);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow);
}

.product-description h2 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-5);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid var(--color-border);
}

.description-content {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: 1.8;
    word-break: break-word;
}

.description-content img {
    border-radius: var(--radius-sm);
    margin: var(--spacing-3) 0;
    max-width: 100%;
}

.description-content p {
    margin-bottom: var(--spacing-3);
}

.description-content h1,
.description-content h2,
.description-content h3,
.description-content h4 {
    color: var(--color-text);
    margin-top: var(--spacing-5);
    margin-bottom: var(--spacing-2);
}

.description-content ul,
.description-content ol {
    padding-left: var(--spacing-6);
    margin-bottom: var(--spacing-3);
}

.description-content li {
    margin-bottom: var(--spacing-1);
    list-style: disc;
}

.description-content code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.875em;
    padding: 2px 4px;
    background: var(--color-bg);
    border-radius: 4px;
    color: var(--color-primary);
}

.description-content pre {
    background: var(--color-text);
    color: #e0e0e0;
    padding: var(--spacing-4);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: var(--spacing-3) 0;
}

.description-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.description-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-3) 0;
}

.description-content th,
.description-content td {
    padding: 6px 12px;
    border: 1px solid var(--color-border);
    text-align: left;
    font-size: var(--text-sm);
}

.description-content th {
    background: var(--color-bg);
    font-weight: 500;
}

@media (max-width: 768px) {
    .product-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-5);
    }

    .product-gallery {
        order: -1;
    }

    .product-info .product-title {
        font-size: var(--text-xl);
    }
}