/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: #3498db;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #2980b9;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 头部样式 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.logo span {
    color: #3498db;
}

.desktop-nav ul {
    display: flex;
    gap: 25px;
}

.desktop-nav a {
    color: #333;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

.desktop-nav a.active {
    color: #3498db;
}

.desktop-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #3498db;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.date-display {
    color: #777;
    font-size: 14px;
    margin-bottom: 0px;
}

.mobile-menu {
    display: none;
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mobile-menu a {
    display: block;
    color: #333;
    padding: 5px 0;
}

.mobile-menu a.active {
    color: #3498db;
    font-weight: bold;
}

/* 主要内容样式 */
main {
    padding: 30px 0;
}

.content-wrapper {
    display: flex;
    gap: 30px;
}

.main-content {
    flex: 2;
}

.sidebar {
    flex: 1;
}

/* 头条新闻样式 */
.featured-article {
    background-color: #fff;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.featured-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.featured-content {
    padding: 20px;
}

/* 新闻列表样式 - 图文左右布局 */
.section-heading {
    font-size: 22px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.news-item {
    display: flex;
    background-color: #fff;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.news-image-container {
    flex: 0 0 300px;
    overflow: hidden;
}

.news-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

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

.news-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.category {
    display: inline-block;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
    color: #fff;
    background-color: #3498db;
    padding: 3px 8px;
    border-radius: 3px;
    margin-bottom: 10px;
    width: fit-content;
}
.detail-image {
max-width: 500px;margin-top:20px;
}

.article-title {
    font-size: 18px;
    margin-bottom: 10px;
    line-height: 1.3;
}

.article-excerpt {
    color: #666;
    margin-bottom: 15px;
    flex: 1;
}

.article-meta {
    font-size: 14px;
    color: #777;
}

/* 查看更多按钮 */
.load-more {
    text-align: center;
    margin-top: 20px;
}

.btn {
    display: inline-block;
    background-color: #3498db;
    color: #fff;
    padding: 10px 20px;
    border-radius: 3px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
    color: #fff;
}

/* 列表页头部 */
.list-header {
    margin-bottom: 30px;
}

.breadcrumb {
    font-size: 14px;
    color: #777;
    margin-bottom: 10px;
}

.breadcrumb a {
    color: #777;
}

.breadcrumb a.active {
    color: #333;
    font-weight: 500;
}

.breadcrumb span {
    margin: 0 8px;
    color: #aaa;
}

.page-title {
    font-size: 28px;
    margin-bottom: 20px;
}

.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.category-filter span {
    color: #777;
}

.category-filter a {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    background-color: #eee;
    color: #333;
    font-size: 14px;
}

.category-filter a.active {
    background-color: #3498db;
    color: #fff;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5px;
    margin-top: 30px;
}

.page-link {
    display: inline-block;
    padding: 8px 15px;
    border: 1px solid #ddd;
    border-radius: 3px;
    color: #333;
}

.page-link.active {
    background-color: #3498db;
    color: #fff;
    border-color: #3498db;
}

.page-link:hover:not(.active) {
    border-color: #3498db;
    color: #3498db;
}

.page-dots {
    padding: 0 10px;
}

/* 侧边栏样式 */
.sidebar-section {
    background-color: #fff;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.sidebar-heading {
    font-size: 18px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #f0f0f0;
}

.sidebar-articles {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.sidebar-article {
    display: flex;
    gap: 10px;
}

.sidebar-article-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 3px;
}

.sidebar-article-content h4 {
    font-size: 14px;
    margin-bottom: 5px;
}

.sidebar-article-meta {
    font-size: 12px;
    color: #777;
}

/* 订阅区域 */
.subscribe-form {
    margin-top: 15px;
}

.subscribe-form input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 3px;
}

.subscribe-form button {
    width: 100%;
    padding: 10px;
    background-color: #3498db;
    color: #fff;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.subscribe-form button:hover {
    background-color: #2980b9;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: #fff;
    padding: 40px 0 20px;
    margin-top: 50px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
}

.footer-column h3 {
    font-size: 18px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: #3498db;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-column a {
    color: #ccc;
    transition: color 0.3s;
}

.footer-column a:hover {
    color: #3498db;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    font-size: 14px;
    color: #aaa;
}

/* 返回顶部按钮 */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
    .news-image-container {
        flex: 0 0 250px;
    }
}

@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .mobile-menu {
        display: none;
    }
    
    .mobile-menu.active {
        display: block;
    }
    
    .content-wrapper {
        flex-direction: column;
    }
    
    .news-item {
        flex-direction: column;
    }
    
    .news-image-container {
        flex: 0 0 200px;
    }
    
    .featured-image {
        height: 250px;
    }
}

@media (max-width: 576px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1px;
    }
    
    .news-image-container {
        flex: 0 0 180px;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
}