/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1e40af;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 48px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    position: relative;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    padding: 8px 0;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link.active::after,
.nav-link:hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.search-container {
    position: relative;
    width: 280px;
}

.search-input {
    width: 100%;
    height: 40px;
    padding: 0 16px 0 44px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 14px;
    background: var(--bg-primary);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
}

.btn-back {
    padding: 8px 20px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* 主内容 */
.main-content {
    margin-top: 72px;
}

/* 通用区域样式 */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 首页区域 */
.section-home {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: 120px 0 80px;
}

.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
    margin-top: 8px;
}

.hero-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.quick-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.quick-nav-item {
    background: var(--bg-card);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.quick-nav-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.quick-nav-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.quick-nav-item h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.quick-nav-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 文档中心 */
.section-docs {
    background: var(--bg-primary);
}

.docs-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
}

.docs-sidebar {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    height: fit-content;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 120px;
}

.sidebar-section {
    margin-bottom: 32px;
}

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

.sidebar-section h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.sidebar-section ul {
    list-style: none;
}

.sidebar-section li {
    margin-bottom: 8px;
}

.sidebar-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    display: block;
    transition: all 0.3s ease;
}

.sidebar-section a:hover,
.sidebar-section a.active {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

.docs-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.doc-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.doc-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.doc-card.featured {
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
}

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

.doc-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.doc-tag {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.doc-tag.featured {
    background: var(--primary-color);
    color: white;
}

.doc-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.doc-meta {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--text-tertiary);
}

.doc-actions {
    display: flex;
    gap: 16px;
}

.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.docs-grid .doc-card h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.docs-grid .doc-card p {
    font-size: 14px;
    margin-bottom: 16px;
}

/* 文档分类内容 */
.docs-category-content {
    display: flex;
    flex-direction: column;
    gap: 48px;
    transition: opacity 0.3s ease;
}

.category-section {
    margin-bottom: 48px;
}

.category-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

/* 服务网格 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all 0.3s ease;
}

.service-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.service-icon {
    font-size: 32px;
    margin-bottom: 16px;
    display: block;
}

.service-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.6;
}

.service-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.service-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.service-links a:hover {
    background: var(--bg-tertiary);
    color: var(--primary-hover);
}

/* 更新列表 */
.update-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.update-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.update-item:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--primary-color);
}

.update-date {
    flex-shrink: 0;
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 500;
    width: 80px;
}

.update-content {
    flex: 1;
}

.update-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.update-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.update-tag {
    flex-shrink: 0;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: white;
}

.update-tag:contains("新功能") {
    background: var(--success-color);
}

.update-item:nth-child(1) .update-tag {
    background: var(--success-color);
}

.update-item:nth-child(2) .update-tag {
    background: var(--primary-color);
}

.update-item:nth-child(3) .update-tag {
    background: var(--warning-color);
}

/* 侧边栏样式增强 */
.sidebar-section h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding: 8px 0;
}

.sidebar-section ul {
    list-style: none;
    margin-bottom: 24px;
}

.sidebar-section li {
    margin-bottom: 4px;
}

.sidebar-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    display: block;
    transition: all 0.3s ease;
}

.sidebar-section a:hover,
.sidebar-section a.active {
    background: var(--bg-tertiary);
    color: var(--primary-color);
}

/* 热门文档样式 */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.doc-card.featured .doc-header h4 {
    font-size: 18px;
}

/* 新闻动态 */
.section-news {
    background: var(--bg-secondary);
}

.news-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
}

.tab-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.news-featured {
    margin-bottom: 48px;
}

.featured-article {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--border-color);
}

.article-image {
    position: relative;
    height: 320px;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--danger-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.article-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-content h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.article-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.article-meta {
    display: flex;
    gap: 24px;
    font-size: 14px;
    color: var(--text-tertiary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 48px;
}

.news-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.news-image {
    height: 200px;
    overflow: hidden;
}

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

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

.news-content {
    padding: 24px;
}

.news-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.news-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.news-meta span {
    font-size: 13px;
    color: var(--text-tertiary);
}

.news-tag {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}

.news-tag.industry {
    background: #dbeafe;
    color: #1e40af;
}

.news-tag.product {
    background: #dcfce7;
    color: #166534;
}

.news-tag.company {
    background: #fef3c7;
    color: #92400e;
}

.load-more {
    text-align: center;
}

.btn-load-more {
    padding: 12px 32px;
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-load-more:hover {
    background: var(--primary-color);
    color: white;
}

/* 研究报告 */
.section-reports {
    background: var(--bg-primary);
}

.reports-filter {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.filter-select {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
}

.reports-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.report-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.report-card.premium {
    border: 2px solid var(--warning-color);
    box-shadow: var(--shadow-md);
}

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

.report-tag {
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
}

.report-tag.premium {
    background: var(--warning-color);
    color: white;
}

.report-tag.tech {
    background: #dbeafe;
    color: #1e40af;
}

.report-tag.market {
    background: #dcfce7;
    color: #166534;
}

.report-tag.case {
    background: #fef3c7;
    color: #92400e;
}

.report-date {
    font-size: 13px;
    color: var(--text-tertiary);
}

.report-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.report-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.6;
}

.report-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--text-tertiary);
}

.report-actions {
    display: flex;
    gap: 12px;
}

.btn-download,
.btn-preview {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-download {
    background: var(--primary-color);
    color: white;
}

.btn-download:hover {
    background: var(--primary-hover);
}

.btn-preview {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-preview:hover {
    background: var(--border-color);
}

/* 技术博客 */
.section-blog {
    background: var(--bg-secondary);
}

.blog-featured {
    margin-bottom: 48px;
}

.featured-post {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--border-color);
}

.post-image {
    height: 300px;
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.post-category {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    width: fit-content;
    margin-bottom: 16px;
}

.post-content h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.post-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.post-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.author-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.post-stats {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-tertiary);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.blog-post {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.blog-post:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.post-thumbnail {
    height: 180px;
    overflow: hidden;
}

.post-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.blog-post:hover .post-thumbnail img {
    transform: scale(1.05);
}

.post-info {
    padding: 24px;
}

.post-info .post-category {
    margin-bottom: 12px;
}

.post-info h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.post-info p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.post-info .post-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-tertiary);
}

/* 关于我们 */
.section-about {
    background: var(--bg-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
    font-size: 16px;
}

.about-features {
    display: grid;
    gap: 24px;
    margin-bottom: 40px;
}

.feature-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 0;
}

.contact-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.contact-info p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
}

.about-visual img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        padding: 0 20px;
    }
    
    .nav-container {
        padding: 0 20px;
    }
    
    .hero-section,
    .featured-article,
    .featured-post,
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .docs-layout {
        grid-template-columns: 1fr;
    }
    
    .docs-sidebar {
        position: static;
        order: 2;
    }
    
    .quick-nav {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid,
    .reports-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .docs-grid,
    .service-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .search-container {
        width: 200px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-stats {
        justify-content: center;
        gap: 32px;
    }
    
    .quick-nav {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .reports-filter {
        flex-direction: column;
        gap: 16px;
    }
    
    .news-tabs {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .news-grid,
    .reports-grid,
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .docs-grid,
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .category-title {
        font-size: 20px;
    }
    
    .service-card {
        padding: 20px;
    }
    
    .update-item {
        flex-direction: column;
        gap: 12px;
    }
    
    .update-date {
        width: auto;
    }
    
    section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .nav-container {
        height: 64px;
    }
    
    .main-content {
        margin-top: 64px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .section-home {
        padding: 80px 0 60px;
    }
    
    .article-content,
    .post-content {
        padding: 20px;
    }
    
    .doc-card,
    .report-card,
    .service-card {
        padding: 16px;
    }
    
    .docs-category-content {
        gap: 32px;
    }
    
    .category-section {
        margin-bottom: 32px;
    }
    
    .category-title {
        font-size: 18px;
        margin-bottom: 16px;
        padding-bottom: 8px;
    }
    
    .service-links {
        gap: 12px;
    }
    
    section {
        padding: 40px 0;
    }
}

/* 滚动行为 */
html {
    scroll-behavior: smooth;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 选择文本样式 */
::selection {
    background: var(--primary-color);
    color: white;
}