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

/* Logo样式 */
.logo {
    width: 100%;
    padding: 10px;
    background: #FFFFFF;
    text-align: left;
}

.logo img {
    max-width: 307px;
    max-height: 107px;
    background: #FFFFFF;
    display: inline-block;
    vertical-align: middle;
}

/* 图片响应式样式 */
img {
    max-width: 100%; /* 不超过父容器宽度 */
    height: auto; /* 保持宽高比 */
    display: block; /* 去除底部间隙 */
    margin: 0 auto; /* 水平居中 */
}

/* 图片响应式居中  核心样式：图片容器 + 图片本身 */
.putong {
    /* 让容器水平居中 */
    text-align: center;
    /* 可选：给容器添加上下间距，避免图片贴边 */
    margin: 20px 0;
}

.responsive-img {
    /* 白色边框 */
    border: 2px solid #fff;
    /* 高度自适应，保持图片比例 */
    height: auto;
    /* 响应式宽度控制 */
    max-width: 98%; /* 默认占满98%宽度，小屏幕生效 */
    /* 阴影可选：增强边框视觉效果，可删除 */
    box-shadow: 0 0 5px rgba(0,0,0,0.1);
}

/* 媒体查询：屏幕宽度>600px时生效 */
@media (min-width: 601px) {
    .responsive-img {
        /* 大屏时固定最大宽度为1024px */
        max-width: 1024px;
    }
}

/* 导航菜单样式 */
.nav_s {
    background-color: #FFFFFF;
    padding: 0.5rem 1rem;
    margin-top: 0;
    border-bottom: 1px solid #e9ecef;
}

.nav_s ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: flex-start;
    margin: 0;
    padding: 0;
}

.nav_s li {
    margin: 0;
}

.nav_s a {
    height: 2rem;
    display: block;
    text-decoration: none;
    color: #336699;
    text-align: center;
    margin-right: 0.5em;
    padding: 0.3rem 0.8rem;
    white-space: nowrap;
    font-size: 14px;
    border-radius: 4px;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.nav_s a:hover {
    font-weight: bold;
    color: #FFFFFF;
    background-color: #336699;
    transform: translateY(-2px);
    border-color: #336699;
}

.clear {
    clear: both;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #FFFFFF;
    font-size: 0.9em;
}

.header {
    background-color: #f8f9fa;
    color: #333;
    padding: 0.8rem 1rem;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.header h1 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: normal;
}

.header a {
    color: #336699;
    text-decoration: none;
    transition: color 0.3s ease;
}

.header a:hover {
    color: #2c5aa0;
    text-decoration: underline;
}

.header h1 a {
    font-weight: bold;
}

.header h1 a:hover {
    text-decoration: none;
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background-color: #FFFFFF;
}



.category-nav {
    margin-bottom: 2rem;
}

.category-section {
    margin-bottom: 1.5rem;
}

.category-section h2 {
    margin-bottom: 0.5rem;
    color: #333;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.5rem;
}

.board-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.board-link {
    background-color: #f9f9f9;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.board-link a {
    color: #333;
    text-decoration: none;
}

.board-link a:hover {
    color: #666;
}

.latest-topics {
    margin-bottom: 2rem;
}

.latest-topics h2 {
    margin-bottom: 1rem;
    color: #333;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.5rem;
}

.topic-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.topic-item {
    background-color: #f9f9f9;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.topic-item h3 {
    margin-bottom: 0.5rem;
}

.topic-item a {
    color: #333;
    text-decoration: none;
}

.topic-item a:hover {
    color: #666;
}

.topic-meta {
    font-size: 0.9rem;
    color: #666;
    display: flex;
    gap: 1rem;
}

.article-container {
    margin-bottom: 2rem;
}

.main-topic {
    background-color: #f9f9f9;
    padding: 1.5rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    margin-bottom: 2rem;
}

.main-topic h2 {
    margin-bottom: 1rem;
    color: #333;
}

.topic-content {
    margin-top: 1rem;
    line-height: 1.8;
}

.replies-container {
    margin-top: 2rem;
}

.replies-container h3 {
    margin-bottom: 1rem;
    color: #333;
    border-bottom: 1px solid #ddd;
    padding-bottom: 0.5rem;
}

.reply-item {
    background-color: #f9f9f9;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    margin-bottom: 1rem;
}

.reply-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.reply-content {
    line-height: 1.8;
}



.more-link {
    text-align: center;
    margin-top: 1rem;
}

.more-link a {
    color: #333;
    text-decoration: none;
    padding: 0.5rem 1rem;
    background-color: #f9f9f9;
    border-radius: 4px;
    border: 1px solid #ddd;
}

.more-link a:hover {
    background-color: #e9e9e9;
}

.footer {
    border-top: 1px solid #ddd;
    margin-top: 20px;
    text-align: center;
    size: 0.5rem;
    line-height: 1.4rem;
    padding: 15px 0;
    background-color: #f9f9f9;
    z-index: 5;
    opacity: 1;
}

.footer p {
    font-size: 0.8rem;
    color: #666;
    margin: 5px 0;
}

.footer a {
    font-size: 0.8rem;
    color: #666;
    text-decoration: none;
}

.footer a:hover {
    color: #333;
    text-decoration: underline;
}

.footer .pipe {
    margin: 0 5px;
    color: #999;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .board-links {
        flex-direction: column;
    }
    
    .topic-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}