/* 现代BLOG风格样式 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-accent: #f1f5f9;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --hover-color: #1e40af;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --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);
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 顶部导航栏 */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    letter-spacing: -0.025em;
}

.site-title:hover {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

/* 主要内容容器 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    align-items: start;
}

.content-main {
    min-width: 0;
}

.sidebar {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    position: sticky;
    top: 6rem;
    height: fit-content;
}

/* 文章页面样式 */
.article-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 3rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.article-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-color);
    margin: 0 0 1.5rem 0;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.meta-icon {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.article-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-color);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4,
.article-content h5,
.article-content h6 {
    color: var(--text-color);
    font-weight: 700;
    line-height: 1.3;
    margin: 2rem 0 1rem 0;
}

.article-content h2 {
    font-size: 1.75rem;
    border-bottom: 2px solid var(--bg-accent);
    padding-bottom: 0.5rem;
}

.article-content h3 {
    font-size: 1.5rem;
}

.article-content p {
    margin: 1.5rem 0;
}

.article-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
}

.article-content a:hover {
    color: var(--hover-color);
    border-bottom-color: var(--hover-color);
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    margin: 2rem 0;
}

.article-content ul,
.article-content ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.article-content li {
    margin: 0.5rem 0;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    background: var(--bg-secondary);
    margin: 2rem 0;
    padding: 1.5rem 2rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--text-light);
}

/* 首页和列表页样式 */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-accent) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.page-title {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    font-weight: 400;
}


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

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

.article-link {
    display: block;
    padding: 2rem;
    text-decoration: none;
    color: var(--text-color);
}

.article-item-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.article-item:hover .article-item-title {
    color: var(--primary-color);
}

.article-item-excerpt {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-item-meta {
    font-size: 0.875rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 侧边栏样式 */
.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.sidebar-content {
    color: var(--text-light);
    line-height: 1.6;
}

.sidebar-list {
    list-style: none;
    padding: 0;
}

.sidebar-list li {
    margin-bottom: 0.75rem;
}

.sidebar-list a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.sidebar-list a:hover {
    color: var(--primary-color);
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
}

.pagination a {
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination .current {
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
}

/* 广告横幅样式 */
.banner-container {
    margin: 3rem 0;
    text-align: center;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.banner-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.banner-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

/* 页脚样式 */
.footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .sidebar {
        position: static;
        margin-top: 2rem;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .main-container {
        padding: 1rem;
    }
    
    .article-container {
        padding: 2rem 1.5rem;
    }
    
    .article-title {
        font-size: 2rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .article-content {
        font-size: 1rem;
    }
    
    .article-link {
        padding: 1.5rem;
    }
    
    .sidebar {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: 1.5rem;
    }
    
    .nav-link {
        padding: 0.375rem 0.75rem;
        font-size: 0.875rem;
    }
    
    .article-title {
        font-size: 1.75rem;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

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

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

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

/* 新增：替代内联样式的CSS类 */

/* Footer链接样式 */
.footer-link {
    color: white;
    text-decoration: none;
}

.footer-link:hover {
    text-decoration: underline;
}

/* 文章列表项动画 - 使用CSS变量 */
.article-item {
    animation: fadeInUp 0.6s ease-out forwards;
    animation-delay: var(--animation-delay, 0s);
}

/* 文章内容图片样式 */
.article-content-image {
    max-width: 100%;
    height: auto;
    margin: 1rem 0;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* 文章图片容器 */
.article-image-container {
    margin: 1.5rem 0;
    text-align: center;
}

.article-image-container .image-caption {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
    font-style: italic;
}

/* 从模板文件移出的样式 */

/* 首页特定样式 */
.hero-ad {
    margin-top: 2rem;
    text-align: center;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.hero-ad:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.hero-ad-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

/* 文章列表样式 */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.article-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.article-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

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

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

.article-category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-info {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-info .article-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-info .article-title a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.article-excerpt {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 1rem;
    flex: 1;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    margin-top: auto;
}

.read-more:hover {
    color: var(--hover-color);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.pagination-dots {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    color: var(--text-muted);
}

.pagination-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem !important;
    font-weight: 600;
}

/* 列表页面特定样式 */
.list-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.view-options {
    display: flex;
    gap: 0.5rem;
}

.view-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

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

.sort-select {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
}

/* 网格视图样式 */
.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

/* 列表视图样式 */
.list-view {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.list-view .article-card {
    flex-direction: row;
    height: auto;
}

.list-view .article-image {
    width: 250px;
    height: 180px;
    flex-shrink: 0;
}

.list-view .article-info {
    flex: 1;
}

/* 响应式样式 */
@media (max-width: 1024px) {
    .article-list {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .article-list {
        grid-template-columns: 1fr;
    }
    
    .pagination-btn {
        padding: 0.5rem 1rem !important;
        font-size: 0.875rem;
    }
    
    .list-controls {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .view-options {
        justify-content: center;
    }
    
    .list-view .article-card {
        flex-direction: column;
    }
    
    .list-view .article-image {
        width: 100%;
        height: 200px;
    }
}

/* 文章页面特定样式 */
.article-header {
    margin-bottom: 2rem;
}

.article-title {
    font-size: 1.8rem !important;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1.3;
    margin-bottom: 1rem;
}

.article-ad {
    margin: 2rem 0;
    text-align: center;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.article-ad:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.article-ad-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
}

.recommended-article {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.recommended-article:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.recommended-article a {
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.recommended-article a:hover {
    color: var(--primary-color);
}

.recommended-article h4 {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.article-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.article-tags {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-light);
}

.article-tags i {
    color: var(--primary-color);
}

.article-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.action-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    text-decoration: none;
}

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

.banner-container {
    margin: 2rem 0;
    text-align: center;
}

.banner-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.banner-image:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 列表页面特有样式 */
.search-box {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--card-bg);
    color: var(--text-color);
}

.search-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.3s ease;
}

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

.hot-article {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.hot-article:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.hot-article a {
    text-decoration: none;
    color: var(--text-color);
}

.hot-article-title {
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.hot-article a:hover .hot-article-title {
    color: var(--primary-color);
}

.hot-article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.category-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.category-tag {
    background: var(--bg-accent);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-tag:hover {
    background: var(--primary-color);
    color: white;
}

.category-tag .count {
    background: var(--primary-color);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 1rem;
    font-size: 0.75rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 文章页面特有样式 */
.recommended-article-title {
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
    line-height: 1.4;
}

.recommended-article a:hover .recommended-article-title {
    color: var(--primary-color);
}

.recommended-article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.no-content {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: 1rem;
}

.related-articles {
    margin-top: 3rem;
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title i {
    color: var(--primary-color);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.related-item {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.related-item h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.related-item p {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* 通用样式 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

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

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

/* 动画效果 */
.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 更多响应式样式 */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .related-grid {
        grid-template-columns: 1fr;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
}