/* 全局样式 - 优化SEO和视觉效果 */
:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 12px 30px rgba(37, 99, 235, 0.15);
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
}

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

html {
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 - 增强SEO可见性 */
.header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-menu a:hover {
    opacity: 0.8;
}

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.hamburger:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.hamburger:active {
    background-color: rgba(255, 255, 255, 0.2);
}

.hamburger:focus {
    outline: 2px solid white;
    outline-offset: 4px;
}

/* 主要内容区域 */
.main-content {
    padding: 2rem 0;
    overflow-x: hidden;
}

.grid-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: start;
}

/* 左侧内容区 */
.left-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-height: 100%;
}

/* 右侧边栏 */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    align-self: start;
}

/* 卡片样式 - 优化层次感 */
.card {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    background: linear-gradient(to bottom, #ffffff, #f8fafc);
}

.card-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header h2 i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: #fafafa;
}

/* 列表项样式 - 优化可读性和SEO */
.list-item {
    display: flex;
    padding: 1.25rem 0.5rem;
    margin: 0 -0.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    border-radius: 8px;
}

.list-item:hover {
    background: #f8fafc;
}

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

.list-item-content {
    flex: 1;
}

.list-item-title {
    font-size: 1.125rem;
    margin-bottom: 0.625rem;
    line-height: 1.5;
}

.list-item-title a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

.list-item-summary {
    color: var(--text-light);
    font-size: 0.9375rem;
    margin-bottom: 0.625rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.list-item-meta {
    display: flex;
    font-size: 0.8125rem;
    color: var(--text-lighter);
    gap: 1.25rem;
    flex-wrap: wrap;
}

.list-item-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.list-item-meta i {
    color: var(--primary-color);
    opacity: 0.7;
}

/* 页脚样式 - SEO优化 */
.footer {
    background: var(--gradient-primary);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.footer-content {
    text-align: center;
}

.footer h5 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.footer p {
    font-size: 0.9375rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: block !important;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--gradient-primary);
        flex-direction: column;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease-in-out;
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 1rem 0;
        width: 100%;
        text-align: center;
    }
    
    .nav-menu a {
        display: block;
        padding: 0.75rem 1.5rem;
        font-size: 1.125rem;
    }
    
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: 1rem 0;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .card {
        border-radius: 12px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* 标签样式 */
.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
}

/* 图片样式 */
.img-responsive {
    max-width: 100%;
    height: auto;
}

/* 面包屑导航 - SEO优化 */
.breadcrumb {
    padding: 1rem 0;
    font-size: 0.875rem;
    color: var(--text-light);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

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

.breadcrumb a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.breadcrumb span {
    color: var(--text-color);
    font-weight: 500;
}

.breadcrumb-item {
    display: inline-flex;
    align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
    content: "›";
    margin: 0 0.5rem;
    color: var(--text-lighter);
    font-size: 1.125rem;
    font-weight: 300;
}

/* 文章内容样式 - SEO优化 */
.article-title {
    font-size: 2rem;
    margin-bottom: 1.25rem;
    color: var(--text-color);
    line-height: 1.4;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.article-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: linear-gradient(to right, #f8fafc, #ffffff);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
    color: var(--text-light);
    font-size: 0.9375rem;
    flex-wrap: wrap;
}

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

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

.article-content {
    font-size: 1.0625rem;
    line-height: 1.85;
    color: var(--text-color);
}

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

.article-content h2,
.article-content h3,
.article-content h4 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-color);
}

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

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

.article-content h4 {
    font-size: 1.25rem;
}

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

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

.article-content a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-color: rgba(37, 99, 235, 0.3);
    text-underline-offset: 3px;
    transition: all 0.3s ease;
}

.article-content a:hover {
    color: var(--secondary-color);
    text-decoration-color: var(--secondary-color);
}

.article-content strong {
    font-weight: 700;
    color: var(--text-color);
}

.article-content code {
    background: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'Consolas', 'Monaco', monospace;
    color: #e11d48;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-light);
    font-style: italic;
    background: #f8fafc;
    padding: 1rem 1.5rem;
    border-radius: 0 8px 8px 0;
}

/* 最佳回答标记 */
.best-answer {
    border-left: 4px solid var(--accent-color);
    position: relative;
}

.best-answer::before {
    content: "最佳回答";
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--accent-color);
    color: white;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

/* 图片错误处理 */
img {
    object-fit: cover;
}

img[alt="placeholder"] {
    background: #f0f0f0;
    min-height: 100px;
}

/* 特殊列表项样式 - 增强视觉层次 */
.featured-item {
    background: linear-gradient(to right, #fef3c7, #ffffff);
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem !important;
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    border-radius: 8px;
}

.featured-item .list-item-title i {
    color: var(--accent-color);
}

.hot-item {
    background: linear-gradient(to right, #fee2e2, #ffffff);
    border-left: 4px solid #ef4444;
    padding-left: 1rem !important;
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    border-radius: 8px;
}

.hot-item .list-item-title i {
    color: #ef4444;
    animation: pulse 2s infinite;
}

.latest-item {
    background: linear-gradient(to right, #dbeafe, #ffffff);
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem !important;
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    border-radius: 8px;
}

.latest-item .list-item-title i {
    color: var(--primary-color);
}

.sidebar-item {
    padding: 0.875rem 0;
}

.sidebar-item .list-item-title {
    font-size: 0.9375rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.sidebar-item .list-item-title i {
    color: var(--primary-color);
    font-size: 0.75rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

/* 列表项标题图标样式 */
.list-item-title i {
    margin-right: 0.375rem;
    font-size: 0.875em;
    opacity: 0.8;
}

/* 脉冲动画 */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

/* 响应式优化 - 针对移动端SEO */
@media (max-width: 992px) {
    .grid-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        margin-top: 2rem;
        position: static;
    }
}

@media (max-width: 576px) {
    .article-title {
        font-size: 1.5rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .list-item-title {
        font-size: 1rem;
    }
    
    .card-header h2 {
        font-size: 1.125rem;
    }
}

/* SEO优化 - 结构化数据支持 */
article,
.article-content {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* 链接优化 - 提升可访问性 */
a {
    outline-offset: 2px;
}

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 图片优化 - SEO友好 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.article-content img {
    margin: 1.5rem auto;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* 表格样式 - 内容丰富性 */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

.article-content th,
.article-content td {
    padding: 0.875rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.article-content th {
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
}

.article-content tr:last-child td {
    border-bottom: none;
}

.article-content tr:hover {
    background: #f8fafc;
}

/* 加载动画 - 提升用户体验 */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.loading {
    animation: shimmer 2s infinite;
    background: linear-gradient(to right, #f0f0f0 8%, #f8f8f8 18%, #f0f0f0 33%);
    background-size: 1000px 100%;
}

/* 打印样式 - SEO友好 */
@media print {
    .header,
    .sidebar,
    .footer,
    .breadcrumb {
        display: none;
    }
    
    .main-content {
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    a {
        text-decoration: underline;
        color: #000;
    }
    
    a[href]:after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }
}

/* 高对比度模式支持 - 可访问性 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0047ab;
        --text-color: #000;
        --background-color: #fff;
        --border-color: #000;
    }
    
    .card {
        border: 2px solid #000;
    }
}

/* 深色模式准备 - 未来扩展 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #1e293b;
        --card-bg: #334155;
        --text-color: #f1f5f9;
        --text-light: #cbd5e1;
        --text-lighter: #94a3b8;
        --border-color: #475569;
    }
}

/* 页脚链接样式 */
.footer-links {
    margin-top: 1rem;
    font-size: 0.875rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
    margin: 0 0.5rem;
}

.footer-links a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.footer-links span {
    opacity: 0.6;
}


/* 用户信息样式 - 头像和昵称在一行 */
.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.user-avatar:hover {
    transform: scale(1.05);
    border-color: var(--primary-color);
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    flex: 1;
}

.user-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-color);
    line-height: 1.3;
}

.user-time {
    font-size: 0.8125rem;
    color: var(--text-lighter);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.user-time i {
    color: var(--primary-color);
    opacity: 0.7;
}

/* 作者信息样式 - post页面 */
.author-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.author-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-color);
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.author-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.author-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1.3;
}

.author-meta {
    display: flex;
    gap: 1.25rem;
    font-size: 0.875rem;
    color: var(--text-light);
    flex-wrap: wrap;
}

.author-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

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

/* 回答项样式 */
.answer-item {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    will-change: transform;
}

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

.answer-content {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.answer-content p {
    margin-bottom: 1rem;
}

.answer-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.answer-meta span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.answer-meta span:hover {
    color: var(--primary-color);
}

.answer-meta i {
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.answer-meta span:hover i {
    transform: scale(1.2);
}

.like-count {
    font-weight: 600;
    color: var(--primary-color);
}

/* 最佳回答样式优化 */
.answer-item.best-answer {
    background: linear-gradient(135deg, #fef3c7 0%, #ffffff 100%);
    border: 2px solid var(--accent-color);
    position: relative;
}

.answer-item.best-answer::before {
    content: "最佳回答";
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--accent-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.answer-item.best-answer .user-avatar {
    border-color: var(--accent-color);
}

/* 响应式优化 - 移动端 */
@media (max-width: 576px) {
    .user-info {
        gap: 0.625rem;
    }
    
    .user-avatar {
        width: 36px;
        height: 36px;
    }
    
    .author-info {
        padding: 1rem;
        gap: 0.75rem;
    }
    
    .author-avatar {
        width: 48px;
        height: 48px;
    }
    
    .author-name {
        font-size: 1rem;
    }
    
    .author-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .answer-item {
        padding: 1rem;
    }
}

/* 防止横向滚动 */
.left-content,
.sidebar,
.card,
.card-body,
.article-content,
.list-item,
.answer-content {
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}

img,
video,
iframe {
    max-width: 100%;
    height: auto;
}

table {
    max-width: 100%;
    overflow-x: auto;
    display: block;
}

pre,
code {
    max-width: 100%;
    overflow-x: auto;
}

/* 移动端菜单遮罩 */
.nav-menu::before {
    content: '';
    position: fixed;
    top: 70px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 70px);
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: -1;
}

.nav-menu.active::before {
    opacity: 1;
    visibility: visible;
}

/* 移动端优化 - 更小屏幕 */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .header {
        padding: 0.75rem 0;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .logo img {
        height: 32px;
    }
    
    .nav-menu {
        top: 60px;
        height: calc(100vh - 60px);
    }
    
    .main-content {
        padding: 0.75rem 0;
    }
    
    .grid-container {
        gap: 1rem;
    }
    
    .card {
        border-radius: 8px;
    }
    
    .card-header,
    .card-body {
        padding: 1rem;
    }
    
    .article-title {
        font-size: 1.375rem;
    }
    
    .list-item-title {
        font-size: 0.9375rem;
    }
}

/* 横屏模式优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .nav-menu {
        height: calc(100vh - 60px);
        padding-top: 1rem;
    }
    
    .nav-menu li {
        margin: 0.5rem 0;
    }
}

/* 确保所有元素不超出视口 */
* {
    max-width: 100%;
}

/* 确保header和footer不超出视口 */
.header,
.footer {
    max-width: 100vw;
}

/* 双栏布局优化 - 高度对齐 */
.grid-container {
    max-width: 1200px;
}

/* 卡片最小高度，避免过短 */
.card {
    min-height: 100px;
}

/* 侧边栏卡片固定在顶部 */
.sidebar > .card:first-child {
    position: sticky;
}

/* 确保内容不会全宽度 */
.main-content > .container {
    max-width: 1200px;
}

/* 桌面端优化 */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}

@media (min-width: 1600px) {
    .container {
        max-width: 1400px;
    }
}

/* 平板端优化 */
@media (max-width: 992px) and (min-width: 769px) {
    .grid-container {
        grid-template-columns: 1fr;
        max-width: 800px;
        margin: 0 auto;
    }
    
    .sidebar {
        display: none;
    }
}