/* ==================== 
   1. CSS Reset & Variables 
   ==================== */
:root {
    --color-primary: #d93636; 
    --color-text-main: #333333;
    --color-text-sub: #666666;
    --color-text-light: #999999;
    --color-bg-body: #f5f5f5;
    --color-bg-white: #ffffff;
    --color-border: #e5e5e5;
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --container-width: 1200px;
    --sidebar-width: 320px;
    --header-height: 60px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-primary);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
    object-fit: cover;
}

/* 工具类：文本溢出隐藏 */
.text-ellipsis-1 {
    display: block;
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    box-sizing: border-box;
}

.text-ellipsis-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    box-sizing: border-box;
}

/* ==================== 
   2. Header & Navigation 
   ==================== */
.site-header {
    background: var(--color-bg-white);
    height: var(--header-height);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header__container {
    max-width: var(--container-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
}

.site-header__logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.site-header__nav {
    display: flex;
    gap: 20px;
}

.site-header__nav-item {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-main);
    padding: 8px 0;
    position: relative;
}

.site-header__nav-item--active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.site-header__search {
    position: relative;
}

.site-header__search-input {
    padding: 6px 30px 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 12px;
    width: 200px;
    outline: none;
}

.site-header__search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
    cursor: pointer;
}

.site-header__btn {
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
}

.site-header__btn--login {
    background: var(--color-primary);
    color: white;
    border: none;
}

.site-header__hamburger {
    display: none;
    font-size: 24px;
    cursor: pointer;
}

/* ==================== 
   3. Main Layout 
   ==================== */
.layout {
    max-width: var(--container-width);
    margin: 20px auto;
    display: flex;
    gap: 20px;
    padding: 0 15px;
    position: relative;
}

.layout__main {
    flex: 1;
    background: var(--color-bg-white);
    padding: 30px;
    border-radius: 4px;
    min-width: 0; /* 防止 flex 子项溢出 */
}

.layout__sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ==================== 
   4. Article Content (Detail Page) 
   ==================== */
.article__header {
    margin-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 20px;
}

.article__title {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 15px;
    color: #000;
}

.article__meta {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--color-text-light);
}

.article__meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article__content {
    font-size: 16px;
    line-height: 1.8;
    color: #333;
}

.article__content p {
    margin-bottom: 20px;
    text-align: justify;
}

.article__image-wrapper {
    margin: 20px 0;
    text-align: center;
}

.article__image {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 0 auto;
    display: block;
}

.article__image-caption {
    font-size: 12px;
    color: var(--color-text-light);
    margin-top: 8px;
    text-align: center;
}

/* 左侧悬浮互动栏 */
.interaction-bar {
    position: absolute;
    left: -60px;
    top: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.interaction-bar__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--color-text-light);
    cursor: pointer;
    font-size: 12px;
}

.interaction-bar__item i {
    font-size: 24px;
    transition: transform 0.2s;
}

.interaction-bar__item:hover i {
    transform: scale(1.1);
    color: var(--color-primary);
}

/* ==================== 
   5. Sidebar Components 
   ==================== */
.sidebar__card {
    background: var(--color-bg-white);
    border-radius: 4px;
    padding: 20px;
    border: 1px solid var(--color-border);
}

.sidebar__author {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.sidebar__avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.sidebar__author-info h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.sidebar__btn-follow {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 4px 15px;
    border-radius: 2px;
    font-size: 12px;
    cursor: pointer;
    margin-left: auto;
}

.sidebar__section-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-main);
}

.sidebar__section-title i {
    color: var(--color-primary);
}

.sidebar__list-item {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    align-items: flex-start;
    min-width: 0;
}

.sidebar__list-thumb {
    width: 80px;
    height: 60px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
}

.sidebar__list-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.sidebar__list-title {
    font-size: 13px;
    line-height: 1.4;
    color: var(--color-text-main);
    min-width: 0;
}

.sidebar__list-meta {
    font-size: 11px;
    color: var(--color-text-light);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar__list-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 热门榜单特殊样式 */
.sidebar__rank-list .sidebar__list-item {
    align-items: center;
}

.sidebar__rank-num {
    width: 18px;
    height: 18px;
    background: #eee;
    color: #999;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2px;
    margin-right: 8px;
    flex-shrink: 0;
}

.sidebar__rank-list .sidebar__list-item:nth-child(1) .sidebar__rank-num,
.sidebar__rank-list .sidebar__list-item:nth-child(2) .sidebar__rank-num,
.sidebar__rank-list .sidebar__list-item:nth-child(3) .sidebar__rank-num {
    background: var(--color-primary);
    color: white;
}

.sidebar__rank-title {
    flex: 1;
    font-size: 13px;
}

/* 视频列表特殊样式 */
.sidebar__video-list .sidebar__list-item {
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.sidebar__video-thumb-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 */
    background: #000;
    border-radius: 4px;
    overflow: hidden;
}

.sidebar__video-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.sidebar__video-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 30px;
    opacity: 0.8;
}

.sidebar__video-duration {
    position: absolute;
    bottom: 5px;
    right: 5px;
    background: rgba(0,0,0,0.6);
    color: white;
    font-size: 10px;
    padding: 2px 4px;
    border-radius: 2px;
}

.sidebar__btn-more {
    display: block;
    width: 100%;
    padding: 10px;
    background: var(--color-primary);
    color: white;
    text-align: center;
    border-radius: 4px;
    font-size: 13px;
    margin-top: 10px;
    transition: all 0.3s ease;
}

.sidebar__btn-more:hover {
    background: #b82c2c;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(217, 54, 54, 0.3);
}

/* ==================== 
   6. Carousel (Home/List Feature) 
   ==================== */
.carousel {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    height: 300px; /* 示例高度 */
    background: #000;
}

.carousel__track {
    display: flex;
    height: 100%;
    transition: transform 0.5s ease;
}

.carousel__slide {
    min-width: 100%;
    height: 100%;
    position: relative;
}

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

.carousel__arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border-radius: 50%;
}

.carousel__arrow--prev { left: 10px; }
.carousel__arrow--next { right: 10px; }

/* 轮播图指示器 */
.carousel__indicators {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 10;
}

.carousel__indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: background 0.3s;
}

.carousel__indicator--active {
    background: white;
}

/* ==================== 
   7. Home Page Components
   ==================== */
.home-carousel {
    max-width: var(--container-width);
    margin: 20px auto;
    padding: 0 15px;
}

.home-carousel .carousel {
    height: 400px;
}

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

.carousel__slide-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.carousel__slide-desc {
    font-size: 14px;
    opacity: 0.9;
}

/* 新闻卡片列表 */
.news-card {
    display: flex;
    gap: 15px;
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
    min-width: 0;
}

.news-card:last-child {
    border-bottom: none;
}

.news-card__thumb {
    width: 200px;
    height: 130px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
}

.news-card__content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-card__title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-main);
    margin-bottom: 10px;
}

.news-card__title:hover {
    color: var(--color-primary);
}

.news-card__summary {
    font-size: 14px;
    color: var(--color-text-sub);
    line-height: 1.6;
    margin-bottom: 10px;
}

.news-card__meta {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--color-text-light);
}

.news-card__meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==================== 
   8. List Page Components
   ==================== */
.filter-bar {
    background: var(--color-bg-white);
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.filter-bar__categories {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-bar__category {
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    background: #f5f5f5;
    color: var(--color-text-sub);
}

.filter-bar__category:hover,
.filter-bar__category--active {
    background: var(--color-primary);
    color: white;
}

.filter-bar__sort {
    display: flex;
    gap: 15px;
    font-size: 13px;
    color: var(--color-text-sub);
}

.filter-bar__sort-item {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.filter-bar__sort-item--active {
    color: var(--color-primary);
    font-weight: 500;
}

/* 列表项样式（比首页卡片更紧凑） */
.news-list-item {
    display: flex;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid var(--color-border);
    min-width: 0;
}

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

.news-list-item__thumb {
    width: 160px;
    height: 100px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
}

.news-list-item__content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.news-list-item__title {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text-main);
    margin-bottom: 8px;
}

.news-list-item__title:hover {
    color: var(--color-primary);
}

.news-list-item__summary {
    font-size: 13px;
    color: var(--color-text-sub);
    line-height: 1.5;
    margin-bottom: 8px;
}

.news-list-item__meta {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--color-text-light);
}

/* 分页组件 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 30px;
    padding: 20px 0;
}

/* 分页 ul 容器 */
.pagination ul {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}

/* 分页 li 元素 */
.pagination ul li {
    margin: 0;
    padding: 0;
}

/* 分页链接和 span 共用样式 */
.pagination ul li a,
.pagination ul li span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.2s ease;
    text-decoration: none;
}

/* 链接正常状态 */
.pagination ul li a {
    background: white;
    border: 1px solid var(--color-border);
    color: var(--color-text-sub);
    cursor: pointer;
}

/* 链接悬停状态 */
.pagination ul li a:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(217, 54, 54, 0.2);
}

/* 当前页 span 样式 */
.pagination ul li span {
    background: var(--color-primary);
    border: 1px solid var(--color-primary);
    color: white;
    font-weight: 500;
    cursor: default;
}

/* 上一页/下一页按钮特殊样式 */
.pagination ul li:first-child a,
.pagination ul li:last-child a {
    padding: 0 16px;
    background: white;
    border: 1px solid var(--color-border);
    color: var(--color-text-sub);
}

/* 上一页/下一页按钮悬停 */
.pagination ul li:first-child a:hover,
.pagination ul li:last-child a:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* 标签云 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-cloud__item {
    padding: 4px 12px;
    background: #f5f5f5;
    border-radius: 4px;
    font-size: 12px;
    color: var(--color-text-sub);
    cursor: pointer;
    transition: all 0.2s;
}

.tag-cloud__item:hover {
    background: var(--color-primary);
    color: white;
}

/* ==================== 
   9. Footer
   ==================== */
.site-footer {
    background: #2a2a2a;
    color: #999;
    padding: 40px 0 20px;
    margin-top: 40px;
}

.site-footer__container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 15px;
}

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

.site-footer__section h4 {
    color: white;
    font-size: 14px;
    margin-bottom: 15px;
}

.site-footer__links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.site-footer__links a {
    font-size: 13px;
}

.site-footer__links a:hover {
    color: white;
}

.site-footer__links a i {
    font-size: 18px;
    margin-right: 6px;
    vertical-align: middle;
}

.site-footer__bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
    font-size: 12px;
}

/* ==================== 
   10. Responsive Design 
   ==================== */
@media (max-width: 991px) {
    .site-header__nav {
        display: none; /* 简化处理，实际需配合 JS 做下拉菜单 */
    }
    
    .site-header__hamburger {
        display: block;
    }

    .layout {
        flex-direction: column;
    }

    .layout__sidebar {
        width: 100%;
        display: none; /* 移动端隐藏侧边栏，或改为底部 */
    }

    .interaction-bar {
        display: none; /* 移动端隐藏悬浮栏 */
    }
    
    .layout__main {
        padding: 20px 15px;
    }
    
    .article__title {
        font-size: 20px;
    }

    .home-carousel .carousel {
        height: 250px;
    }

    .carousel__slide-title {
        font-size: 18px;
    }

    .carousel__slide-content {
        padding: 20px;
    }

    .news-card {
        flex-direction: column;
    }

    .news-card__thumb {
        width: 100%;
        height: 180px;
    }

    .news-list-item {
        flex-direction: column;
    }

    .news-list-item__thumb {
        width: 100%;
        height: 150px;
    }

    .filter-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-footer__content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .site-header__search {
        display: none;
    }
    
    .site-header__actions .site-header__btn {
        display: none;
    }
}

/* ==================== 
   11. Utility Classes 
   ==================== */
/* Header action icons */
.header-action-icon {
    cursor: pointer;
}

/* Primary color text */
.text-primary {
    color: var(--color-primary);
}

/* ==================== 
   12. Comment Section 
   ==================== */
.comment-section {
    margin-top: 40px;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.comment-section__title {
    margin-bottom: 20px;
    font-size: 18px;
}

.comment-section__placeholder {
    background: #f9f9f9;
    padding: 30px;
    text-align: center;
    color: #999;
    border-radius: 4px;
}

.comment-section__login-link {
    color: var(--color-primary);
}

/* ==================== 
   13. Section Header (Index Page) 
   ==================== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--color-primary);
}

.section-header__title {
    font-size: 18px;
    font-weight: 700;
}

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

.section-header__more {
    font-size: 13px;
    color: var(--color-text-light);
}

.section-header__more:hover {
    color: var(--color-primary);
}

/* ==================== 
   14. Load More Button 
   ==================== */
.btn-load-more {
    padding: 12px 40px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text-sub);
    transition: all 0.2s ease;
}

.btn-load-more:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.load-more-wrapper {
    text-align: center;
    padding: 30px 0;
}

/* ==================== 
   15. Author Badge 
   ==================== */
.sidebar__author-badge {
    font-size: 12px;
    color: #999;
}

/* ==================== 
   16. Video Rank Labels 
   ==================== */
.sidebar__video-rank {
    position: absolute;
    top: 5px;
    left: 5px;
}

.sidebar__video-rank--top1 {
    background: var(--color-primary);
}

.sidebar__video-rank--top2 {
    background: #f39c12;
}

.sidebar__video-rank--top3 {
    background: #999;
}