@charset "utf-8";
body {
    font-size: 62.5%;
}

html>body {
    font-size: 12px;
    color: #666;
    font-family: "宋体";
}

body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form,
    fieldset, input, textarea, blockquote, th, td {
    padding: 0;
    margin: 0;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

fieldset, img {
    border: 0;
}

address, caption, cite, code, dfn, th, var {
    font-weight: normal;
    font-style: normal;
}

ol, ul {
    list-style: none;
}

caption, th {
    text-align: left;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: normal;
    font-size: 100%;
}

q:before, q:after {
    content: '';
}

abbr, acronym {
    border: 0;
}

a {
    text-decoration: none;
    font-family: "微软雅黑";
    color: #4e4e4e;
}

a:hover {
    color: #d43c30;
}

li{
    list-style-type: none;
}

fr{
    float: right;
}

fl{
    float: left;
}

html body div.clear, html body span.clear {
    background: none;
    border: 0;
    clear: both;
    float: none;
    font-size: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
    visibility: hidden;
    width: 0;
    height: 0;
}

.clearfix:after {
    content: "020";
    display: block;
    height: 0;
    clear: both;
}

.clearfix {
    zoom: 1; /*为了兼容IE6/IE7*/
}

p {
    margin: 0px;
    padding: 0px;
    font-family: "微软雅黑";
}

a,h1,h2,h3,p,div {
    color: #666;
    font-family: "微软雅黑";
}

a:hover {
    color: #f00!important;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.top_nav {
    height: 50px;
    line-height: 50px;
    background: #ededed;
    border-bottom: 1px solid #ccc;
}

.mr20 {
    margin-right: 20px;
}
.mt20{
    margin-top: 20px;
}

.mt30{
    margin-top: 30px;
}

.ml30{
    margin-left: 30px;
}
.w1200 {
    width: 1200px;
    height: auto;
    margin: auto;
}


.topnav_con {
    width: 1000px;
    margin: auto;
    padding: 0px;
}

.topnav_logo {
    float: left;
    margin-right: 20px;
    margin-top: 5px;
}

.list_nv li {
    float: left;
    margin-right: 15px;
    line-height: 50px;
}

.list_nv li a {
    color: #777;
    font-weight: normal;
}


.main {
    width: 1200px;
    margin: 0px auto;
}

.cb{
    clear: both;
}


.poster-item {
    height: 340px;
    width: 480px;
    cursor: default;
    background: rgb(253, 236, 218);
    border-radius: 10px;
    padding: 30px 23px 20px;
    transition: 0.5s;
}

.for_btn img {
    width: 480px;
    height: 300px;
}

.cell_list {
    margin-bottom: 20px;
    color: rgb(153, 153, 153);
    font-size: 18px;
    margin-top: 14px;
    overflow: hidden;
    text-align: center;
}

.zwjs {
    line-height: 30px;
    padding-top: 5px;
    color: rgb(53, 53, 53);
    font-size: 14px;
    max-height: 84px;
    text-indent: 2em;
    border-top: 1px solid rgb(208, 205, 219);
    overflow: hidden;
    white-space: normal;
}

.pictureSlider {
    height: 420px;
    margin-bottom: 24px;
}

.container {margin: auto;padding: 0px;width: 1200px;height: auto;overflow: hidden;}

.banner {
    padding: 0;
    width: 100%;
    height: 740px;
    margin: 0 auto;
    background: url(https://img.sxdaily.com.cn/pic/ccmtjs26.jpg) no-repeat center;
    background-size: 100% 100%;
}

.tt {
    background: url(https://img.sxdaily.com.cn/pic/topnews.jpg) no-repeat;
    height: 80px;
    margin-top: 20px;
    /* background-color: #ff7300a1; */
    white-space: nowrap; /* 防止文本换行 */
    overflow: hidden; /* 隐藏溢出的内容 */
    text-overflow: ellipsis;
}

.tt h2 {
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-left: 100px;
    font-size: 35px;
    line-height: 80px;
    font-weight: 700;
}


/* 视频行容器 - 占据页面中一行，宽度占满父容器，优雅居中 */
.video-row {
    /* width: 100%; */
    max-width: 1280px;      /* 大屏时限制最大宽度，保持美观，但仍然占据一行主体 */
    margin: 20px auto;
    border-radius: 20px;
    box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.2);
    background: #000;
    transition: all 0.2s ease;
}

/* 视频播放器包装器：相对定位容器，负责尺寸与比例 */
.video-player {
    position: relative;
    width: 100%;
    /* 保证16:9视觉比例，同时视频内容自适应，现代显示友好 */
    aspect-ratio: 16 / 9;
    background-color: #000;
    border-radius: 20px;
    overflow: hidden;
    cursor: default;
}

/* 原生video元素: 占满整个容器，支持控件，音频视频平滑 */
.video-element {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;    /* 确保完整显示视频内容，无裁剪，背景黑色填充黑边 */
    background: #000;
    display: block;
}

/* 封面图层: 完全覆盖视频区域，初始显示，点击后隐藏 */
.cover-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;       /* 后备背景，防止图片加载问题 */
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    cursor: pointer;       /* 为整体图层也可以点击，但为了严谨我们只监听按钮，但图层内按钮区域独立捕获事件 */
}

/* 封面图片 */
.cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;      /* 封面图片铺满整个区域，美观且不暴露黑边，适合展示预览图 */
    display: block;
    pointer-events: none;   /* 让图片不干扰点击事件，所有点击由播放按钮或图层子元素处理 */
}

/* ---------- 大播放按钮样式 (居中，视觉醒目) ---------- */
.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), 0 0 0 2px rgba(255, 255, 255, 0.2);
    z-index: 20;
}

/* 播放按钮三角图标 */
.play-btn::after {
    content: "▶";
    font-size: 34px;
    font-weight: 400;
    color: white;
    margin-left: 5px;      /* 视觉微调使三角形居中 */
    line-height: 1;
    transition: transform 0.1s ease;
}

/* 悬浮放大效果 + 光晕 */
.play-btn:hover {
    background: rgba(0, 0, 0, 0.85);
    transform: translate(-50%, -50%) scale(1.08);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4), 0 0 0 3px rgba(255, 255, 255, 0.35);
}

.play-btn:active {
    transform: translate(-50%, -50%) scale(0.96);
}

/* 可选：移动端触摸优化 */
@media (max-width: 640px) {
    .play-btn {
        width: 65px;
        height: 65px;
    }
    .play-btn::after {
        font-size: 28px;
        margin-left: 4px;
    }
    .video-row {
        border-radius: 16px;
    }
    .video-player {
        border-radius: 16px;
    }
    .m1200 {
        width: 1200px;
    }
}

/* 提供额外的描述信息：可选，让用户明白操作（优雅提示） */
.video-caption {
    text-align: center;
    margin-top: 16px;
    font-size: 0.85rem;
    color: #4a5568;
    letter-spacing: 0.3px;
    font-weight: 450;
}

.video-caption span {
    background: #e9ecef;
    padding: 4px 12px;
    border-radius: 40px;
    display: inline-block;
}

/* 确保外部背景整洁 */
footer {
    margin-top: 28px;
    font-size: 0.75rem;
    color: #6c757d;
    text-align: center;
}

.cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;   /* 左右两列均分宽度 */
    gap: 1.8rem;
    margin-top: 30px;
    margin-bottom: 30px;
}

/* 卡片样式：方形边框，左图右文，无特效，无圆角（直角边框） */
.card {
    display: flex;
    gap: 1.2rem;
    background: rgb(253, 236, 218);
    border: 1px solid #d4dcec;    /* 方形边框，无圆角 */
    padding: 1rem;
    transition: none;              /* 无任何动画 */
}

/* 左侧图片：严格遵循宽250px 高165px */
.card-img {
    flex-shrink: 0;
    width: 250px;
    height: 165px;
    background-color: #eef2ff;
    overflow: hidden;
}

.card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;      /* 图片填充不变形，裁剪居中 */
    display: block;
}

/* 右侧内容区：仅标题 + 简介，无多余标签 */
.card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: #0f172a;
}

.card-desc {
    font-size: 0.85rem;
    line-height: 1.5;
    color: #475569;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
}