* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    padding: 20px;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

/* 文章列表样式 */
.article-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.article-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

/* 封面图片网格布局 - 高度增加到220px */
/* 封面图片网格布局 - 严格240px高度 */
.cover-grid {
    display: grid;
    width: 100%;
    height: 240px;
    overflow: hidden;
    gap: 2px;
    grid-template-rows: repeat(auto-fit, minmax(0, 1fr)); /* 重要 */
    align-items: stretch; /* 确保子项填满 */
}

/* 1张图 - 铺满整个封面 */
.cover-grid[data-count="1"] {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
}

/* 2张图 - 左右两宫格 */
.cover-grid[data-count="2"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr;
}

/* 3张图 - 左边分上下两格，右边一格横跨两行 */
.cover-grid[data-count="3"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}
.cover-grid[data-count="3"] img:first-child {
    grid-row: 1;
    grid-column: 1;
}
.cover-grid[data-count="3"] img:nth-child(2) {
    grid-row: 2;
    grid-column: 1;
}
.cover-grid[data-count="3"] img:nth-child(3) {
    grid-row: span 2;
    grid-column: 2;
}

/* 4张图 - 四宫格 */
.cover-grid[data-count="4"] {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}

/* 5张图 - 左边一张横跨两行，右边两行两列 */
.cover-grid[data-count="5"] {
    grid-template-columns: 1fr 1fr 1fr; /* 三列布局 */
    grid-template-rows: 1fr 1fr; /* 两行布局 */
}
.cover-grid[data-count="5"] img:first-child {
    grid-row: span 2; /* 左边图片跨两行 */
    grid-column: 1;   /* 第一列 */
}
.cover-grid[data-count="5"] img:nth-child(2) {
    grid-row: 1;
    grid-column: 2;   /* 第二列第一行 */
}
.cover-grid[data-count="5"] img:nth-child(3) {
    grid-row: 1;
    grid-column: 3;   /* 第三列第一行 */
}
.cover-grid[data-count="5"] img:nth-child(4) {
    grid-row: 2;
    grid-column: 2;   /* 第二列第二行 */
}
.cover-grid[data-count="5"] img:nth-child(5) {
    grid-row: 2;
    grid-column: 3;   /* 第三列第二行 */
}

/* 6张图 - 两行三列 */
.cover-grid[data-count="6"] {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr;
}

/* 7张图 - 左边一张横跨三行，右边三行两列 */
.cover-grid[data-count="7"] {
    grid-template-columns: 2fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
}
.cover-grid[data-count="7"] img:first-child {
    grid-row: span 3;
    grid-column: 1;
}
.cover-grid[data-count="7"] img:nth-child(2) {
    grid-row: 1;
    grid-column: 2;
}
.cover-grid[data-count="7"] img:nth-child(3) {
    grid-row: 1;
    grid-column: 3;
}
.cover-grid[data-count="7"] img:nth-child(4) {
    grid-row: 2;
    grid-column: 2;
}
.cover-grid[data-count="7"] img:nth-child(5) {
    grid-row: 2;
    grid-column: 3;
}
.cover-grid[data-count="7"] img:nth-child(6) {
    grid-row: 3;
    grid-column: 2;
}
.cover-grid[data-count="7"] img:nth-child(7) {
    grid-row: 3;
    grid-column: 3;
}

/* 8张图 - 三行三列，其中一张占两格 */
.cover-grid[data-count="8"] {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    height: calc(240px - 4px); /* 减去2个gap */
}

/* 方案1：让第1张图占据左上角2格（跨行+跨列）*/
.cover-grid[data-count="8"] img:first-child {
    grid-row: span 2;
    grid-column: span 2; /* 改为跨两列 */
}

/* 后续图片自动排列 */
.cover-grid[data-count="8"] img:nth-child(n+2) {
    grid-row: auto;
    grid-column: auto;
}
/* 其余图片正常排列 */

/* 9张图 - 三行三列 */
.cover-grid[data-count="9"] {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
}

/* 确保所有图片完整显示 */
.cover-grid img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    
    /* 新增：防止图片自身属性影响 */
    display: block;
    max-height: 100%;
    min-height: 0; /* 关键：允许缩小 */
}

.cover-grid img:hover {
    transform: scale(1.03);
}

/* 视频封面样式 */
.video-cover {
    width: 100%;
    height: 220px;
    position: relative;
    overflow: hidden;
}

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

.video-cover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.video-cover::before {
    content: '▶';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 50px;
    z-index: 2;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

/* 文章内容样式 */
.article-content {
    padding: 18px;
}

.article-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #222;
}

.article-content p {
    font-size: 14px;
    color: #666;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 浮层样式 */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1000;
    padding: 20px;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

.overlay-content {
    background: white;
    border-radius: 12px;
    width: 100%;
    max-width: 550px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s;
    padding: 25px;
}

.overlay.active .overlay-content {
    transform: scale(1);
}

/* 关闭按钮 - 右上角蓝色背景 */
.close-btn {
    margin-left: auto;
    position: relative;  /* 关键修改：改为 fixed 定位 */
    top: 15px;       /* 稍微增加间距更美观 */
    background: #4285f4;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: white;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    transition: all 0.2s;
    z-index: 1001;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.close-btn:hover {
    background: #3367d6;
    transform: scale(1.1);
}

.overlay-body {
    
}

.overlay-body .cover-grid {
    height: 280px;
    margin-bottom: 20px;
}

.overlay-body video {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 20px;
}

.overlay-body h2 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #222;
}

.overlay-body p {
    font-size: 16px;
    color: #444;
    line-height: 1.7;
}

/* 图片查看器样式 */
.image-viewer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1100;
}

.image-viewer.active {
    opacity: 1;
    visibility: visible;
}

.viewer-container {
    width: 90%;
    max-width: 800px;
    height: 80vh;
    position: relative;
    overflow: hidden;
}

.slider-container {
    display: flex;
    height: calc(100% - 90px);
    transition: transform 0.3s ease;
    will-change: transform;
}

.slide {
    min-width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.thumbnails {
    display: flex;
    justify-content: center;
    gap: 12px;
    height: 80px;
    overflow-x: auto;
    padding: 8px;
}

.thumbnails img {
    width: 70px;
    height: 70px;
    object-fit: cover;
    border-radius: 5px;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s, transform 0.2s;
    border: 2px solid transparent;
}

.thumbnails img:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

.thumbnails img.active {
    opacity: 1;
    border-color: #fff;
    transform: scale(1.1);
}

.viewer-close-btn {
    position: absolute;
    top: 25px;
    right: 25px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    font-size: 30px;
    cursor: pointer;
    color: white;
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    transition: all 0.2s;
    z-index: 1101;
}

.viewer-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .cover-grid, .video-cover {
        height: 240px;
    }
    
    .overlay-body .cover-grid {
        height: 240px;
    }
    
    .viewer-container {
        width: 95%;
        height: 70vh;
    }
    
    .thumbnails {
        height: 70px;
    }
    
    .thumbnails img {
        width: 60px;
        height: 60px;
    }
}