/* ============================================
   ChaokuCMS 前端样式 - 现代化设计
   ============================================ */

/* CSS 变量定义 */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --danger-color: #f56565;
    --info-color: #4299e1;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-dark: #1a202c;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    overflow-x: hidden;
}

/* 容器 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   导航栏样式
   ============================================ */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.05);
    pointer-events: none;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #fff;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo i {
    margin-right: 0.75rem;
    font-size: 1.8rem;
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
    display: block;
}

.nav-menu a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: #fff;
    transform: translateY(-1px);
}

/* 子菜单 */
.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-primary);
    list-style: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 200px;
    z-index: 1001;
    margin-top: 0.5rem;
    overflow: hidden;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.submenu li {
    padding: 0;
}

.submenu a {
    color: var(--text-primary);
    padding: 0.9rem 1.2rem;
    display: block;
    white-space: nowrap;
    border-radius: 0;
    border-bottom: 1px solid var(--border-color);
}

.submenu li:last-child a {
    border-bottom: none;
}

.submenu a:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    transform: none;
}

.nav-menu li:hover .submenu {
    display: block;
}

/* 搜索框 */
.nav-search {
    display: flex;
    align-items: center;
}

.nav-search form {
    display: flex;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50px;
    padding: 0.3rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast);
}

.nav-search form:focus-within {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.nav-search input {
    background: transparent;
    border: none;
    padding: 0.6rem 1rem;
    color: #fff;
    outline: none;
    width: 220px;
    font-size: 0.95rem;
}

.nav-search input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.nav-search button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    color: #fff;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-search button:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.05);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    font-size: 1.5rem;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ============================================
   主内容区域
   ============================================ */
.main-content {
    padding: 0;
    min-height: calc(100vh - 350px);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    color: #fff;
    padding: 100px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.hero-section h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 0.8s ease;
}

.hero-section p {
    font-size: 1.4rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   内容网格布局
   ============================================ */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 2.5rem;
    padding: 3rem 0;
}

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

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

/* ============================================
   文章列表样式
   ============================================ */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--primary-color);
    display: inline-block;
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.article-item {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

.article-item h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.article-item h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.article-item h3 a:hover {
    color: var(--primary-color);
}

.article-item p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-item .meta {
    display: flex;
    gap: 1.25rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.article-item .meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.article-item .meta i {
    font-size: 0.85rem;
}

/* ============================================
   文章卡片样式
   ============================================ */
.article-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.article-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.article-card-content {
    padding: 1.5rem;
}

.article-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.article-card h4 a {
    color: var(--text-primary);
    text-decoration: none;
}

.article-card h4 a:hover {
    color: var(--primary-color);
}

.article-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   侧边栏样式
   ============================================ */
.sidebar-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.sidebar-section h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-section h3 i {
    color: var(--primary-color);
}

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

.sidebar-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-list li:last-child {
    border-bottom: none;
}

.sidebar-list a {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all var(--transition-fast);
}

.sidebar-list a::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
}

.sidebar-list a:hover {
    color: var(--primary-color);
    padding-left: 0.5rem;
}

/* 热门文章排行 */
.hot-article-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.hot-rank {
    width: 28px;
    height: 28px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.hot-rank.top-3 {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
}

.hot-article-item a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    line-height: 1.5;
    flex: 1;
    transition: color var(--transition-fast);
}

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

/* ============================================
   分类页面样式
   ============================================ */
.category-header {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: 3rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.category-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.category-header h1 i {
    color: var(--primary-color);
    font-size: 2rem;
}

/* ============================================
   文章详情页样式
   ============================================ */
.article-detail {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    margin: 2rem 0;
}

.article-full {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.article-category {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.article-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    flex-wrap: wrap;
}

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

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

.article-cover {
    margin: 2rem 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.article-cover img {
    width: 100%;
    height: auto;
    display: block;
}

.article-content {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-primary);
}

.article-content h2,
.article-content h3,
.article-content h4 {
    margin: 2.5rem 0 1.25rem;
    color: var(--text-primary);
    font-weight: 700;
}

.article-content h2 {
    font-size: 1.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.article-content h3 {
    font-size: 1.4rem;
}

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

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    box-shadow: var(--shadow-md);
}

.article-content blockquote {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-content code {
    background: var(--bg-secondary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
    color: var(--danger-color);
}

.article-content pre {
    background: var(--bg-dark);
    color: #fff;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.5rem 0;
}

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

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

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

.article-content a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

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

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

.article-tags {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

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

.tag {
    display: inline-block;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.tag:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* 相关文章 */
.related-articles {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.related-articles h3 {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.related-articles h3 i {
    color: var(--primary-color);
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* ============================================
   特色区块样式
   ============================================ */
.features-section {
    padding: 4rem 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-xl);
    background: var(--bg-secondary);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: #fff;
    box-shadow: var(--shadow-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   分类展示样式
   ============================================ */
.categories-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    text-decoration: none;
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.category-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.category-card h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.category-card span {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   统计区块样式
   ============================================ */
.stats-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff, rgba(255,255,255,0.8));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* ============================================
   轮播图样式
   ============================================ */
.carousel-section {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
}

.carousel-container {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    position: relative;
}

.carousel-slide img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.carousel-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 3rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: #fff;
}

.carousel-content h2 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.carousel-content p {
    opacity: 0.9;
}

.carousel-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.carousel-nav:hover {
    background: rgba(255, 255, 255, 0.4);
}

.carousel-prev {
    left: 1.5rem;
}

.carousel-next {
    right: 1.5rem;
}

.carousel-dots {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.75rem;
}

.carousel-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.carousel-dot.active {
    background: #fff;
    transform: scale(1.2);
}

/* ============================================
   页脚样式
   ============================================ */
.footer {
    background: linear-gradient(135deg, var(--bg-dark) 0%, #2d3748 100%);
    color: #fff;
    padding: 4rem 0 0;
    margin-top: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer-section h3 {
    margin-bottom: 1.5rem;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.75rem;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-section a:hover {
    color: var(--primary-color);
    padding-left: 0.5rem;
}

.footer-section a i {
    font-size: 0.8rem;
}

.footer-bottom {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* 社交链接 */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
    padding-left: 0;
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

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

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ============================================
   通知消息样式
   ============================================ */
.notification {
    position: fixed;
    top: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    color: #fff;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    animation: slideInRight 0.3s ease;
}

.notification-success {
    background: var(--success-color);
}

.notification-error {
    background: var(--danger-color);
}

.notification-warning {
    background: var(--warning-color);
}

.notification-info {
    background: var(--info-color);
}

.notification.fade-out {
    animation: slideOutRight 0.3s ease forwards;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100px);
    }
}

/* ============================================
   空状态样式
   ============================================ */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* ============================================
   加载动画
   ============================================ */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   分页样式
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 3rem 0;
}

.pagination a,
.pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

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

.pagination .current {
    background: var(--primary-color);
    color: #fff;
}

.pagination .disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   滚动动画
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        order: 2;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem;
    }
    
    .menu-toggle {
        display: flex;
        order: -1;
    }
    
    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0.5rem;
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.2);
    }
    
    .nav-menu.mobile-active {
        display: flex;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .submenu {
        position: static;
        display: none;
        box-shadow: none;
        margin-top: 0.5rem;
        background: rgba(255, 255, 255, 0.1);
    }
    
    .submenu a {
        color: #fff;
    }
    
    .nav-menu li:hover .submenu {
        display: none;
    }
    
    .nav-menu li.active .submenu {
        display: block;
    }
    
    .nav-search {
        width: 100%;
        margin-top: 1rem;
    }
    
    .nav-search form {
        width: 100%;
    }
    
    .nav-search input {
        flex: 1;
        width: auto;
    }
    
    .hero-section {
        padding: 60px 0 80px;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-section p {
        font-size: 1.1rem;
    }
    
    .article-detail {
        padding: 1.5rem;
    }
    
    .article-header h1 {
        font-size: 1.75rem;
    }
    
    .article-meta {
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .carousel-slide img {
        height: 250px;
    }
    
    .carousel-content {
        padding: 1.5rem;
    }
    
    .carousel-content h2 {
        font-size: 1.25rem;
    }
    
    .features-grid,
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

/* ============================================
   阅读进度条
   ============================================ */
.reading-progress {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(102, 126, 234, 0.1);
    z-index: 999;
}

.reading-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.1s ease;
}

/* ============================================
   图片灯箱
   ============================================ */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.lightbox.closing {
    animation: fadeOut 0.3s ease forwards;
}

.lightbox-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    cursor: zoom-out;
}

.lightbox-image {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.3s ease;
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes scaleIn {
    from { 
        opacity: 0;
        transform: scale(0.9);
    }
    to { 
        opacity: 1;
        transform: scale(1);
    }
}

/* ============================================
   代码复制按钮
   ============================================ */
.code-copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
}

pre:hover .code-copy-btn {
    opacity: 1;
}

.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.code-copy-btn.copied {
    background: var(--success-color);
    color: #fff;
    opacity: 1;
}

/* ============================================
   文章缩略图
   ============================================ */
.article-thumbnail {
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.article-thumbnail img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-item:hover .article-thumbnail img {
    transform: scale(1.05);
}

/* ============================================
   点赞按钮
   ============================================ */
.like-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.like-btn:hover {
    background: var(--danger-color);
    border-color: var(--danger-color);
    color: #fff;
}

.like-btn.liked {
    background: var(--danger-color);
    border-color: var(--danger-color);
    color: #fff;
}

.like-btn i {
    transition: transform var(--transition-fast);
}

.like-btn:hover i {
    transform: scale(1.2);
}

/* ============================================
   打印样式
   ============================================ */
@media print {
    .navbar,
    .footer,
    .sidebar,
    .back-to-top,
    .notification,
    .reading-progress {
        display: none !important;
    }
    
    .main-content {
        padding: 0;
        min-height: auto;
    }
    
    .article-detail {
        box-shadow: none;
        border: none;
        padding: 0;
    }
    
    .article-content a {
        text-decoration: underline;
    }
    
    .article-content a::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: var(--text-muted);
    }
}

/* ============================================
   响应式设计 - 小屏幕
   ============================================ */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .article-item {
        padding: 1.25rem;
    }
    
    .article-item h3 {
        font-size: 1.1rem;
    }
    
    .article-item .meta {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    
    .sidebar-section {
        padding: 1.25rem;
    }
    
    .lightbox-close {
        top: 1rem;
        right: 1rem;
        width: 40px;
        height: 40px;
    }
    
    .code-copy-btn {
        opacity: 1;
        width: 32px;
        height: 32px;
    }
}