#div_NR video{
    margin: 0 auto;
    display: block;
    max-width: 100%;
    height: auto;}
.container {}
        h1 {
            text-align: center;
            color: #005999;
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid #0077dd;
            letter-spacing: 2px;}
        /* 核心：四大卡片的父容器 自动两列排版 自适应 */
        .card-group {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-bottom: 40px;}
        /* 四大独立方框卡片样式 - 重中之重 */
        .info-card {
            flex: 1;
            min-width: 320px;
            background: #f9fcff;
            border: 1px solid #e6f0fa;
            border-radius: 10px;
            padding: 22px 20px;
            box-shadow: 0 2px 8px rgba(0,102,204,0.06);}
        .info-card h2 {
            color: #0066cc;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 18px;
            padding-bottom: 10px;
            border-bottom: 1px solid #e6f0fa;}
        .info-card p {
            font-size: 17px;
            color: #2d3748;
            margin: 12px 0;}
        .info-card p span {
            color: #0066cc;
            font-weight: 600;}
        /* 官方网络平台-二维码展示区 */
        .qr-section {
            margin-top: 10px;
            padding: 25px 20px;
            background: #f9fcff;
            border: 1px solid #e6f0fa;
            border-radius: 10px;}
        .qr-section h2 {
            color: #005999;
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 25px;
            text-align: center;}
        /* 二维码列表排版 */
        .qr-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 25px;}
        .qr-item {
            text-align: center;
            width: 120px;}
        /* 二维码占位框 可直接替换成真实二维码图片 */
        .qr-code {
            width: 100px;
            height: 100px;
            background: #ffffff;
            border: 1px solid #e0e9f2;
            border-radius: 6px;
            margin: 0 auto 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #99aabb;
            font-size: 12px;}
        .qr-code img{ width:100%;}
        .qr-item p {
            font-size: 15px;
            color: #2d3748;
            white-space: nowrap;}