/**
 * 燕京大学校友会主题样式
 * 主色调：燕园红 #C41E3A
 */

/* ==================== 颜色变量 ==================== */
:root {
    /* 燕园红系列 */
    --yanyuan-red: #C41E3A;
    --yanyuan-red-light: #E84C4F;
    --yanyuan-red-lighter: #F8E5E7;
    --yanyuan-red-dark: #8B1827;

    /* 文字颜色 */
    --text-color: #333333;
    --text-light: #666666;
    --text-lighter: #999999;

    /* 背景颜色 */
    --bg-white: #FFFFFF;
    --bg-gray: #F5F5F5;
    --bg-gray-light: #FAFAFA;

    /* 边框颜色 */
    --border-color: #DDDDDD;
    --border-light: #EEEEEE;

    /* 其他 */
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Microsoft YaHei', '微软雅黑', 'Source Han Sans CN', '思源黑体', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--bg-white);
}

a {
    color: var(--yanyuan-red);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--yanyuan-red-dark);
}

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

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

/* ==================== 顶部容器（不固定，随页面滚走） ==================== */
#top-container {
    position: static;
    background: var(--bg-white);
}

/* ==================== 头部 ==================== */
.site-header {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    padding: 20px 0;
}

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

.logo img {
    max-height: 60px;
}

.logo h1 {
    color: var(--yanyuan-red);
    font-size: 28px;
    font-weight: bold;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box form {
    display: flex;
    border: 2px solid var(--yanyuan-red);
    border-radius: 25px;
    overflow: hidden;
}

.search-input {
    border: none;
    outline: none;
    padding: 10px 20px;
    font-size: 14px;
    width: 300px;
}

.search-btn {
    background-color: var(--yanyuan-red);
    color: white;
    border: none;
    padding: 10px 25px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

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

.advanced-search-link {
    font-size: 12px;
    color: var(--text-light);
    white-space: nowrap;
}

/* ==================== 导航栏（吸顶固定） ==================== */
.main-nav {
    background-color: var(--yanyuan-red);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

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

.nav-menu li {
    position: relative;
}

.nav-link {
    display: block;
    padding: 15px 25px;
    color: white;
    font-size: 16px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-menu li.active .nav-link {
    background-color: var(--yanyuan-red-light);
    color: white;
}

/* 下拉子菜单 */
.sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    list-style: none;
    padding: 0;
    z-index: 1000;
}

.nav-item:hover .sub-menu {
    display: block;
}

.sub-menu li {
    display: block;
}

.sub-menu a {
    display: block;
    padding: 12px 20px;
    color: #333;
    font-size: 14px;
    border-bottom: 1px solid #f0f0f0;
    transition: var(--transition);
}

.sub-menu a:hover {
    background-color: var(--yanyuan-red-lighter);
    color: var(--yanyuan-red);
    padding-left: 25px;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    transition: var(--transition);
}

/* ==================== 主内容区 ==================== */
.main-content {
    min-height: 500px;
    padding-top: 0;
}

/* position:sticky 无需动态 padding 补偿，此规则已废弃 */

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    background-color: var(--bg-gray-light);
    padding: 8px 0;
    font-size: 13px;
}

.breadcrumb a {
    color: var(--text-light);
}

.breadcrumb .sep {
    margin: 0 8px;
    color: var(--text-lighter);
}

.breadcrumb .current {
    color: var(--text-color);
}

/* ==================== 页面布局 ==================== */
.page-container {
    display: flex;
    gap: 30px;
    margin: 15px auto;
}

.sidebar {
    width: 240px;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height, 140px) + 10px); /* JS测量一次后设置 --header-height */
    align-self: flex-start;
    background-color: var(--bg-white);
}

.main-area {
    flex: 1;
    min-width: 0;
}

/* ==================== 侧边栏 ==================== */
.sidebar-header {
    background-color: #ffffff;
    color: var(--text-color);
    padding: 15px 20px;
    border-radius: 4px 4px 0 0;
    border: 1px solid var(--border-light);
    border-bottom: 2px solid var(--yanyuan-red);
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: normal;
}

.sidebar-menu {
    list-style: none;
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-top: none;
}

.sidebar-menu li {
    border-bottom: 1px solid var(--border-light);
}

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

.sidebar-menu a {
    display: block;
    padding: 12px 20px 12px 28px; /* 右移文字（2-2）*/
    color: var(--text-color);
    transition: var(--transition);
}

.sidebar-menu li.active a,
.sidebar-menu a:hover {
    background-color: var(--yanyuan-red-lighter);
    color: var(--yanyuan-red);
    border-left: 3px solid var(--yanyuan-red);
    padding-left: 25px; /* 右移后保持对齐 */
}

/* 当前栏目始终高亮（2-3）*/
.sidebar-menu li.active a {
    background-color: var(--yanyuan-red-lighter) !important;
    color: var(--yanyuan-red) !important;
    border-left: 3px solid var(--yanyuan-red) !important;
    padding-left: 25px !important;
}

.sidebar-section {
    margin-top: 20px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
}

.sidebar-title {
    background-color: var(--bg-gray);
    padding: 12px 20px;
    font-size: 16px;
    font-weight: normal;
    border-bottom: 1px solid var(--border-light);
}

.related-list {
    list-style: none;
    padding: 10px 0;
}

.related-list li {
    padding: 8px 20px;
    border-bottom: 1px solid var(--border-light);
}

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

.related-list a {
    color: var(--text-color);
    font-size: 13px;
}

.related-list a:hover {
    color: var(--yanyuan-red);
}

/* ==================== 首页样式 ==================== */
/* 轮播图 */
.hero-slider {
    position: relative;
    height: 400px;
    overflow: hidden;
    background-color: var(--bg-gray);
}

.slider-container {
    height: 100%;
}

.slide-item {
    position: relative;
    height: 100%;
    display: none;
}

.slide-item:first-child {
    display: block;
}

.slide-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slide-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
    padding: 40px 0 30px;
}

.slide-caption h2 {
    font-size: 32px;
    margin-bottom: 10px;
}

.slide-caption p {
    font-size: 16px;
    margin-bottom: 15px;
}

.btn-primary {
    display: inline-block;
    padding: 10px 30px;
    background-color: var(--yanyuan-red);
    color: white;
    border-radius: 4px;
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: var(--yanyuan-red-dark);
    color: white;
}

.slider-controls button {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(196, 30, 58, 0.7);
    border: none;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.slider-controls button svg {
    display: block;
}

.slider-controls button:hover {
    background-color: rgba(196, 30, 58, 0.9);
    transform: translateY(-50%) scale(1.1);
}

.slider-prev {
    left: 20px;
}

.slider-next {
    right: 20px;
}

.slider-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

/* 首页栏目模块 */
.home-sections {
    padding: 20px 20px;
}

.home-section {
    margin-bottom: 50px;
}

/* 首页栏目固定配图布局 */
.section-with-image {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.section-fixed-image {
    width: 200px;
    flex-shrink: 0;
}

.section-fixed-image img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    border-radius: 4px;
    display: block;
}

/* 配图显示在右侧：将 class 改为 section-fixed-image-right 即可 */
.section-fixed-image-right {
    order: 1;
}

.section-with-image .article-list {
    flex: 1;
    min-width: 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--yanyuan-red);
}

.section-title {
    font-size: 24px;
    color: var(--yanyuan-red);
    position: relative;
}

.more-link {
    font-size: 14px;
    color: var(--text-light);
}

/* 文章卡片网格 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.article-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
}

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

.article-image {
    display: block;
    height: 200px;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.article-content {
    padding: 20px;
}

.article-content h3 {
    font-size: 16px;
    margin-bottom: 10px;
    line-height: 1.5;
}

.article-content h3 a {
    color: var(--text-color);
}

.article-content h3 a:hover {
    color: var(--yanyuan-red);
}

.article-excerpt {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 10px;
}

.article-meta {
    font-size: 12px;
    color: var(--text-lighter);
    display: flex;
    gap: 15px;
}

/* 文章列表 */
.article-list {
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
}

.article-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

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

.article-item:hover {
    background-color: var(--bg-gray-light);
}

.article-item h3 {
    flex: 1;
    font-size: 14px;
    font-weight: normal;
}

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

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

.article-item .date {
    font-size: 12px;
    color: var(--text-lighter);
    white-space: nowrap;
}

/* 小卡片网格 */
.article-grid-small {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.article-card-small {
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition);
}

.article-card-small:hover {
    box-shadow: var(--shadow);
}

.article-card-small .thumb {
    display: block;
    height: 120px;
    overflow: hidden;
}

.article-card-small .thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.article-card-small .info {
    padding: 12px;
}

.article-card-small h4 {
    font-size: 13px;
    font-weight: normal;
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-card-small h4 a {
    color: var(--text-color);
}

.article-card-small h4 a:hover {
    color: var(--yanyuan-red);
}

.article-card-small .date {
    font-size: 11px;
    color: var(--text-lighter);
}

/* ==================== 列表页 ==================== */
.page-header {
    margin-bottom: 25px;
}

.page-title {
    font-size: 28px;
    color: var(--yanyuan-red);
    margin-bottom: 10px;
}

.page-description {
    color: var(--text-light);
    font-size: 14px;
}

/* 显示模式切换 */
.view-mode-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-light);
}

.view-mode-switch {
    display: flex;
    gap: 5px;
}

.mode-btn {
    padding: 8px 12px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.mode-btn:hover,
.mode-btn.active {
    background-color: var(--yanyuan-red);
    border-color: var(--yanyuan-red);
    color: white;
}

.mode-btn svg {
    display: block;
}

.mode-btn.active svg {
    fill: white;
}

.total-count {
    font-size: 13px;
    color: var(--text-lighter);
}

/* 文章容器 - 列表模式 */
.article-container.list-mode {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.list-article {
    display: flex;
    gap: 20px;
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    padding: 20px;
    transition: var(--transition);
}

.list-article:hover {
    box-shadow: var(--shadow);
}

.list-article .article-thumb {
    width: 220px;
    height: 150px;
    flex-shrink: 0;
    overflow: hidden;
    border-radius: 4px;
}

.list-article .article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.list-article .article-title {
    font-size: 18px;
    font-weight: normal;
    margin-bottom: 12px;
    line-height: 1.5;
}

.list-article .article-title a {
    color: var(--text-color);
}

.list-article .article-title a:hover {
    color: var(--yanyuan-red);
}

.list-article .article-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

/* 小图标模式 */
.article-container.grid-small-mode {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* 大图标模式 */
.article-container.grid-large-mode {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

/* 详细列表模式 */
.article-container.detail-list-mode {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.article-container.detail-list-mode .list-article {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--border-light);
    border-radius: 0;
    box-shadow: none;
    gap: 0;
}

.article-container.detail-list-mode .list-article:hover {
    background-color: var(--bg-gray-light);
    box-shadow: none;
}

.article-container.detail-list-mode .article-thumb {
    display: none;
}

.article-container.detail-list-mode .article-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.article-container.detail-list-mode .article-title {
    font-size: 14px;
    margin-bottom: 0;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.article-container.detail-list-mode .article-desc {
    display: none;
}

.article-container.detail-list-mode .article-meta {
    flex-shrink: 0;
    margin-left: 20px;
}

/* 模式按钮文字样式 */
.mode-btn {
    font-size: 13px;
    font-weight: normal;
}

/* ==================== 内容页 ==================== */
.article-detail {
    background-color: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    padding: 40px;
}

.article-header {
    text-align: center;
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 25px;
    margin-bottom: 30px;
}

.article-title {
    font-size: 32px;
    color: var(--text-color);
    margin-bottom: 10px;
    line-height: 1.4;
}

.article-subtitle {
    font-size: 20px;
    color: var(--text-light);
    font-weight: normal;
    margin-bottom: 20px;
}

.article-detail .article-meta {
    justify-content: center;
    font-size: 13px;
}

/* 文章正文 */
.article-body {
    font-size: 16px;
    line-height: 2;
    color: var(--text-color);
}

.article-body p {
    margin-bottom: 20px;
}

.article-body img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 25px auto;
    border-radius: 4px;
}

.article-body h2,
.article-body h3,
.article-body h4 {
    margin: 30px 0 20px;
    color: var(--yanyuan-red);
}

/* 文章标签 */
.article-tags {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
    display: -webkit-flex;
    display: flex;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-align-items: center;
    align-items: center;
    gap: 8px; /* Chrome 84+, Firefox 63+, Safari 14.1+ */
}

.tag-label {
    color: var(--text-light);
    font-size: 14px;
    -webkit-flex-shrink: 0;
    flex-shrink: 0;
}

.tag-item {
    display: inline-block;
    padding: 5px 15px;
    background-color: var(--bg-gray);
    color: var(--text-color);
    font-size: 12px;
    border-radius: 15px;
    -webkit-transition: var(--transition);
    transition: var(--transition);
    white-space: nowrap;
    -webkit-flex-shrink: 0;
    flex-shrink: 0;
    margin: 2px 0; /* gap fallback for older browsers */
}

.tag-item:hover {
    background-color: var(--yanyuan-red);
    color: white;
}

/* 上一篇/下一篇 */
.article-nav {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.article-nav > div {
    font-size: 14px;
}

.nav-label {
    color: var(--text-light);
    display: block;
    margin-bottom: 5px;
}

.next-article {
    text-align: right;
}

/* ==================== 分页 ==================== */
.pagination {
    margin-top: 40px;
    text-align: center;
}

.pagination a,
.pagination span {
    display: inline-block;
    padding: 8px 15px;
    margin: 0 3px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    transition: var(--transition);
}

.pagination a:hover,
.pagination .active {
    background-color: var(--yanyuan-red);
    border-color: var(--yanyuan-red);
    color: white;
}

/* ==================== 页脚 ==================== */
.site-footer {
    background-color: var(--bg-gray);
    border-top: 3px solid var(--yanyuan-red);
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: var(--yanyuan-red);
    font-size: 18px;
    margin-bottom: 20px;
}

.contact-info p {
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--text-color);
}

.qrcode {
    text-align: center;
}

.qrcode p {
    margin-top: 10px;
    font-size: 13px;
    color: var(--text-light);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-color);
    font-size: 13px;
}

.footer-links a:hover {
    color: var(--yanyuan-red);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-light);
}

.footer-bottom p {
    margin-bottom: 5px;
}

.footer-bottom a {
    color: var(--text-light);
}

.footer-bottom a:hover {
    color: var(--yanyuan-red);
}

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--yanyuan-red);
    color: white;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top:hover {
    background-color: var(--yanyuan-red-dark);
}

.back-to-top.show {
    display: flex;
}

/* ==================== 搜索页面 ==================== */
.search-page {
    max-width: 900px;
    margin: 0 auto 40px;
}

.advanced-search-form {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 40px;
}

.advanced-search-form .page-title {
    color: var(--yanyuan-red);
    margin-bottom: 10px;
}

.advanced-search-form .page-description {
    color: var(--text-light);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 15px;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--yanyuan-red);
}

.form-text {
    display: block;
    margin-top: 5px;
    font-size: 13px;
    color: var(--text-light);
}

.radio-group {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* 多关键词搜索行 */
.keyword-rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.keyword-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.keyword-row .field-selector {
    width: 100px;
    flex-shrink: 0;
    padding: 10px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-white);
    font-size: 14px;
}

.keyword-row .keyword-input {
    flex: 1;
}

.date-range {
    display: flex;
    align-items: center;
    gap: 15px;
}

.date-range .form-control {
    flex: 1;
}

.date-separator {
    color: var(--text-light);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn-primary, .btn-secondary {
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--yanyuan-red);
    color: white;
}

.btn-primary:hover {
    background-color: var(--yanyuan-red-dark);
}

.btn-secondary {
    background-color: #f5f5f5;
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: #e0e0e0;
}

/* 搜索结果 */
.search-results {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    scroll-margin-top: 165px; /* 导航栏高度(~147px)+约一个字符间距(~18px)，使滚动后标题正好位于导航栏下方 */
}

.result-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--yanyuan-red);
}

.result-header h2 {
    color: var(--yanyuan-red);
    margin-bottom: 10px;
}

.result-stats {
    color: var(--text-light);
}

.result-stats strong {
    color: var(--yanyuan-red);
    font-weight: 600;
}

.result-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.result-item {
    padding: 20px;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    transition: var(--transition);
}

.result-item:hover {
    border-color: var(--yanyuan-red);
    box-shadow: 0 4px 12px rgba(196, 30, 58, 0.1);
}

.result-title {
    font-size: 18px;
    margin-bottom: 10px;
}

.result-title a {
    color: var(--text-color);
}

.result-title a:hover {
    color: var(--yanyuan-red);
}

.result-excerpt {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 15px;
}

.result-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.meta-item svg {
    width: 16px;
    height: 16px;
    stroke: var(--text-light);
}

/* 搜索提示 */
.search-tips {
    background: var(--bg-white);
    padding: 60px 40px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
}

.search-tips svg {
    stroke: var(--yanyuan-red-lighter);
    margin-bottom: 20px;
}

.search-tips h3 {
    color: var(--yanyuan-red);
    margin-bottom: 20px;
}

.search-tips ul {
    list-style: none;
    text-align: left;
    max-width: 500px;
    margin: 0 auto;
}

.search-tips li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-light);
}

.search-tips li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--yanyuan-red);
    font-size: 20px;
    line-height: 1;
}

/* 响应式 */
@media (max-width: 767px) {
    .advanced-search-form,
    .search-results {
        padding: 20px;
    }

    .date-range {
        flex-direction: column;
    }

    .form-actions {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        justify-content: center;
    }

    .result-meta {
        flex-direction: column;
        gap: 10px;
    }
}

/* ==================== 首页专题报道轮播（9-1/9-2）==================== */
.section-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.special-nav-btn {
    background: none;
    border: 1px solid var(--border-color);
    cursor: pointer;
    padding: 3px 10px;
    border-radius: 3px;
    color: var(--text-light);
    font-size: 13px;
    line-height: 1.5;
    transition: var(--transition);
}

.special-nav-btn:hover:not([disabled]) {
    background: var(--yanyuan-red);
    border-color: var(--yanyuan-red);
    color: white;
}

.special-nav-btn[disabled] {
    opacity: 0.35;
    cursor: not-allowed;
}

.special-carousel-wrapper {
    position: relative;
    overflow: visible;
}

/* 轮播覆盖箭头按钮（浮在图片左右边缘上）*/
.special-overlay-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-color);
    transition: var(--transition);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.special-overlay-btn:hover:not([disabled]) {
    background: var(--yanyuan-red);
    border-color: var(--yanyuan-red);
    color: white;
}

.special-overlay-btn[disabled] {
    opacity: 0.3;
    cursor: not-allowed;
}

.special-overlay-prev {
    left: -18px;
}

.special-overlay-next {
    right: -18px;
}

.special-slider-window {
    overflow: hidden;
}

.special-slider {
    display: flex;
    transition: transform 0.4s ease;
}

.special-slide-card {
    flex: 0 0 33.333%;
    padding: 0 10px;
    box-sizing: border-box;
}

.special-slide-card .card-img {
    display: block;
    width: 100%;
    height: 160px;
    overflow: hidden;
    border-radius: 4px;
    border: 1px solid var(--border-light);
}

.special-slide-card .card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.special-slide-card .card-img:hover img {
    transform: scale(1.05);
}

.special-slide-card .card-img.no-img {
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    text-align: center;
    color: var(--text-light);
    font-size: 13px;
}

.special-slide-card h3 {
    font-size: 13px;
    font-weight: normal;
    padding: 8px 0 4px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin: 0;
}

.special-slide-card h3 a {
    color: var(--text-color);
}

.special-slide-card h3 a:hover {
    color: var(--yanyuan-red);
}

/* ==================== 首页底部4张导航图（10-5）==================== */
.home-banners {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin: 10px 0 20px;
}

.banner-item {
    display: block;
    border-radius: 6px;
    border: 1px solid var(--border-light);
    text-align: center;
    padding: 28px 15px 20px;
    color: var(--yanyuan-red);
    transition: var(--transition);
    background: var(--yanyuan-red-lighter);
}

.banner-item:hover {
    background: var(--yanyuan-red);
    color: white;
    border-color: var(--yanyuan-red);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.banner-item .banner-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
}

.banner-item:hover .banner-icon svg {
    stroke: white;
}

.banner-item h3 {
    font-size: 15px;
    font-weight: normal;
    margin: 0;
}

/* ==================== 校友通讯模板（12-1/12-2）==================== */
/* 大图标模式（默认） */
.nl-grid-mode {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.nl-item {
    text-align: center;
}

.nl-cover {
    display: block;
    overflow: hidden;
    border-radius: 4px;
    border: 1px solid var(--border-light);
    margin-bottom: 8px;
    transition: box-shadow 0.2s;
}

.nl-cover:hover {
    box-shadow: var(--shadow);
}

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

.nl-cover-placeholder {
    background: var(--bg-gray);
    min-height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    color: var(--text-light);
    font-size: 13px;
}

.nl-title {
    font-size: 13px;
    font-weight: normal;
    line-height: 1.5;
    margin: 0 0 4px;
}

.nl-date {
    font-size: 12px;
    color: var(--text-lighter);
    margin: 0;
}

/* 列表模式 */
.list-mode.nl-grid-mode,
.list-mode .nl-item {
    display: unset;
}

.list-mode .nl-item {
    display: flex;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    text-align: left;
    gap: 12px;
}

.list-mode .nl-cover {
    width: 50px;
    flex-shrink: 0;
    margin-bottom: 0;
    border-radius: 2px;
}

.list-mode .nl-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-size: 14px;
}

.list-mode .nl-date {
    flex-shrink: 0;
}

/* 详细列表模式 */
.detail-list-mode.nl-grid-mode {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.detail-list-mode .nl-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    text-align: left;
    gap: 15px;
}

.detail-list-mode .nl-cover {
    display: none;
}

.detail-list-mode .nl-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-size: 14px;
}

.detail-list-mode .nl-date {
    flex-shrink: 0;
}

/* ==================== 图片史料 ==================== */

/* 文件夹列表（photos-index.html）*/
.photos-folders {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 15px;
}

.photo-folder {
    display: block;
    text-decoration: none;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}

.photo-folder:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    transform: translateY(-2px);
}

.folder-cover {
    width: 100%;
    /* aspect-ratio 兼容方案：用 padding-bottom 替代（支持 Chrome 60+, Firefox 55+, Safari 11+）*/
    height: 0;
    padding-bottom: 75%; /* 4:3 = 75% */
    overflow: hidden;
    background: #f0f0f0;
    position: relative;
}

.folder-cover img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.folder-cover-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
    background: #e8e8e8;
    color: #999;
    font-size: 13px;
    text-align: center;
    padding: 10px;
    box-sizing: border-box;
}

.folder-info {
    padding: 10px 12px;
    background: #fff;
}

.folder-info h3 {
    margin: 0 0 4px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.folder-info p {
    margin: 0;
    font-size: 12px;
    color: #999;
}

/* ==================== 图片史料图集（Splide）==================== */

/* 外层容器 */
.gallery-wrapper {
    width: 100%;
}

/* 主图区域：包裹大图 + 悬浮信息栏 */
.gallery-main-area {
    position: relative;
    background: var(--bg-gray);
    border: 1px solid var(--border-light);
    border-bottom: none;
    border-radius: 4px 4px 0 0;
    overflow: hidden;
    line-height: 0;      /* 消除 inline 图片底部空隙 */
}

/* 主 Splide 容器 */
.gallery-main-splide {
    display: block;
    width: 100%;
}
.gallery-main-splide .splide__track {
    min-height: 300px; /* 旧浏览器兼容：防止 aspect-ratio 不支持时高度塌陷 */
    aspect-ratio: 16 / 9;
}
.gallery-main-splide .splide__slide {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gray);
}
.gallery-main-splide .splide__slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
}

/* 无图片占位 */
.splide-no-img {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-size: 13px;
    text-align: center;
    padding: 20px;
    line-height: 1.4;
}

/* 箭头：位于大图内部，左右各 16px */
.gallery-main-splide .splide__arrow {
    background: rgba(0, 0, 0, 0.45);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    opacity: 1;
    width: 44px;
    height: 44px;
    transition: background 0.2s;
}
.gallery-main-splide .splide__arrow--prev { left: 16px; }
.gallery-main-splide .splide__arrow--next { right: 16px; }
.gallery-main-splide .splide__arrow svg { fill: #fff; width: 16px; height: 16px; }
.gallery-main-splide .splide__arrow:hover:not(:disabled) { background: rgba(0, 0, 0, 0.75); opacity: 1; }
.gallery-main-splide .splide__arrow:disabled { opacity: 0.2; }

/* 信息悬浮栏：叠加在大图底部，渐变遮罩 */
.gallery-info-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 5;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding: 28px 60px 10px;   /* 左右空出箭头位置 */
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.55));
    min-height: 48px;
    line-height: 1.4;
}
.gallery-caption {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 12px;
    color: rgba(255, 255, 255, 0.95);
    font-size: 13px;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
}
.gallery-counter {
    flex: 0 0 auto;
    color: rgba(255, 255, 255, 0.75);
    font-size: 12px;
    white-space: nowrap;
}

/* 缩略图条：与大图左右对齐 */
.gallery-thumbs-splide {
    background: transparent;
    border: 1px solid var(--border-light);
    border-top: none;
    padding: 6px 0 8px;   /* 只留上下间距，不留左右 */
    border-radius: 0 0 4px 4px;
    cursor: pointer;
    overflow: hidden;     /* 截断超出容器的部分 */
}
/* 允许最后一张缩略图在右边缘自然截断 */
.gallery-thumbs-splide .splide__track {
    overflow: visible;
}
.gallery-thumbs-splide .splide__slide {
    overflow: hidden;
    border: 2px solid transparent;
    border-radius: 3px;
    opacity: 0.5;
    transition: opacity 0.2s, border-color 0.2s;
}
.gallery-thumbs-splide .splide__slide.is-active {
    border-color: var(--yanyuan-red);
    opacity: 1;
}
.gallery-thumbs-splide .splide__slide:hover {
    opacity: 0.85;
}
.gallery-thumbs-splide .splide__slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 图片史料——列表模式 */
.photos-list-mode { margin-top: 15px; }
.photos-list-mode .photo-list-item {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
    gap: 14px;
}
.photos-list-mode .photo-list-thumb {
    flex: 0 0 90px;
    width: 90px;
    height: 68px;
    object-fit: cover;
    border-radius: 3px;
}
.photos-list-mode .photo-list-info { flex: 1; min-width: 0; }
.photos-list-mode .photo-list-title {
    display: block;
    font-size: 14px;
    color: var(--text-color);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.photos-list-mode .photo-list-title:hover { color: var(--yanyuan-red); }
.photos-list-mode .photo-list-date { font-size: 12px; color: var(--text-lighter); margin-top: 3px; }

/* 图片史料——详细列表模式 */
.photos-detail-mode { margin-top: 15px; }
.photos-detail-mode .photo-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
}
.photos-detail-mode .photo-list-thumb { display: none; }
.photos-detail-mode .photo-list-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}
.photos-detail-mode .photo-list-title {
    font-size: 14px;
    color: var(--text-color);
    text-decoration: none;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.photos-detail-mode .photo-list-title:hover { color: var(--yanyuan-red); }
.photos-detail-mode .photo-list-date {
    font-size: 12px;
    color: var(--text-lighter);
    flex-shrink: 0;
    white-space: nowrap;
    margin-left: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
    .photos-folders {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    .gallery-main-splide .splide__track {
        min-height: 240px; /* 旧浏览器兼容 */
        aspect-ratio: 4 / 3;
    }
}

/* ==================== Flexbox gap 兼容性回退 ====================
   针对不支持 flexbox gap 的浏览器（Chrome 60-83, Firefox 55-62, Safari 11-14.0）
   由 header.html 中的检测脚本在 <html> 上添加 .no-flexbox-gap 类触发
   ================================================================ */

/* 主布局：侧边栏 + 内容区间距 */
.no-flexbox-gap .page-container > * + * {
    margin-left: 30px;
}

/* 文章列表容器：各文章条目间距 */
.no-flexbox-gap .article-container.list-mode > * + * {
    margin-top: 20px;
}

/* 文章列表条目：缩略图与文字之间 */
.no-flexbox-gap .list-article > * + * {
    margin-left: 20px;
}

/* 文章元信息（日期/作者/来源）*/
.no-flexbox-gap .article-meta > * + * {
    margin-left: 15px;
}

/* 搜索结果列表：各结果间距 */
.no-flexbox-gap .result-list > * + * {
    margin-top: 25px;
}

/* 搜索结果元信息 */
.no-flexbox-gap .result-meta > * + * {
    margin-left: 20px;
}

/* 元信息图标与文字 */
.no-flexbox-gap .meta-item > * + * {
    margin-left: 5px;
}

/* 搜索框：输入框与按钮 */
.no-flexbox-gap .search-box > * + * {
    margin-left: 10px;
}

/* 视图切换按钮组 */
.no-flexbox-gap .section-controls > * + * {
    margin-left: 8px;
}

/* 校友通讯列表条目：缩略图与文字 */
.no-flexbox-gap .list-mode .nl-item > * + * {
    margin-left: 12px;
}

/* 相册列表条目：缩略图与文字 */
.no-flexbox-gap .photos-list-mode .photo-list-item > * + * {
    margin-left: 14px;
}

/* ==================== 频道汇总页（channel-list.html / special-index.html）==================== */

.channel-section {
    margin-bottom: 35px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-light);
}

.channel-section:last-child {
    border-bottom: none;
}

.channel-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--yanyuan-red-lighter);
}

.channel-section-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.channel-section-title a {
    color: inherit;
    text-decoration: none;
}

.channel-section-title a:hover {
    color: var(--yanyuan-red);
}

.channel-more-link {
    font-size: 13px;
    color: var(--text-light);
    text-decoration: none;
    white-space: nowrap;
}

.channel-more-link:hover {
    color: var(--yanyuan-red);
}

.channel-article-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 0;
    border-bottom: 1px dashed var(--border-light);
}

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

.channel-article-title {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    flex: 1;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-right: 15px;
    line-height: 1.5;
}

.channel-article-title::before {
    content: '·';
    color: var(--yanyuan-red);
    margin-right: 6px;
}

.channel-article-title:hover {
    color: var(--yanyuan-red);
}

.channel-article-date {
    font-size: 12px;
    color: var(--text-lighter);
    flex-shrink: 0;
}

/* ==================== 经典影音大图标模式（media-list.html）==================== */

.article-container.media-grid-mode {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.article-container.media-grid-mode .list-article {
    flex-direction: column;
    padding: 0;
    gap: 0;
    overflow: hidden;
    border-radius: 6px;
}

.article-container.media-grid-mode .article-thumb {
    width: 100%;
    height: 160px;
    border-radius: 0;
    flex-shrink: 0;
}

.article-container.media-grid-mode .article-info {
    padding: 12px;
    flex: 1;
}

.article-container.media-grid-mode .article-title {
    font-size: 14px;
    margin-bottom: 6px;
}

.article-container.media-grid-mode .article-desc {
    display: none;
}

.article-container.media-grid-mode .article-meta {
    margin-top: 6px;
}

/* 经典影音文件夹层次 */
.media-folders {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 15px;
}

/* 固定配图 no-flexbox-gap 兼容 */
.no-flexbox-gap .section-with-image > * + * {
    margin-left: 20px;
}