.top-bg {
    background-image: url('/static/images/column-top-bg1.jpg');
    height: 600px;
    background-position: center;
    background-repeat: no-repeat;
    background-size: auto 100%;
}
.nav-bar {
    background: linear-gradient(90deg, #044F9F 50%, #fff 50%);
    box-shadow: 1px 1px 13px 0px rgba(0,0,0,0.1);
    position: relative;
    z-index: 9;
}
.nav-bar-line {
    width: 1500px;
    margin: 0 auto;
    background-color: #FFF;
    display: flex;
    justify-content: space-between;
}
.nav-bar-line .nav-title {
    border-left: 1px solid #FFF;
    font-weight: 400;
    font-size: 18px;
    color: #FFFFFF;
    line-height: 28px;
    padding: 30px 70px;
    background-color: #044F9F;
}
.nav-bar-line .nav-children {
    display: flex;
}
.nav-bar-line .nav-children .nav-children-item {
    font-weight: 400;
    font-size: 18px;
    color: #232323;
    line-height: 88px;
    margin: 0 40px;
    height: 88px;
    display: block;
}
.nav-bar-line .nav-children .nav-children-item.active {
    color: #044F9F;
    height: 87px;
    border-bottom: 1px solid #044F9F;
}
.nav-bar-line .nav-children .nav-children-item:hover {
    color: #044F9F;
    height: 87px;
    border-bottom: 1px solid #044F9F;
}
.box4 {
    background-image: url('/static/images/columns-box9-bg.png');
    background-size: 100% 1200px;
    background-position: top;
    background-repeat: no-repeat;
}
.box4 .content-1500 {
    width: 1500px;
    margin: 0 auto;
    padding-top: 120px;
}
.box4 .title {
    font-weight: 500;
    font-size: 42px;
    color: #232323;
    line-height: 54px;
    padding-top: 90px;
}
.box4 .title-border {
    width: 52px;
    height: 8px;
    background: #044F9F;
    margin-top: 16px;
}
.box4 .article-first {
    width: 1500px;
    height: 560px;
    margin-bottom: 80px;
}
.box4 .article-first .video-image {
    width: 1500px;
    height: 560px;
}
.box4 .article-first .video {
    width: 1500px;
    height: 560px;
    object-fit: cover;
}
.box4 .article-first .video-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.box4 .article-first .a-info {
    margin-top: -388px;
    width: 100%;
}
.box4 .article-first .a-info .play-btn {
    width: 120px;
    height: 120px;
    margin: 0 auto;
}
.box4 .article-first .a-info .play-btn img {
    width: 100%;
    height: 100%;
}
.box4 .article-first .a-info .a-title {
    font-weight: 600;
    font-size: 40px;
    color: #FFFFFF;
    line-height: 56px;
    text-align: center;
    margin-top: 40px;
}
.box4 .article-list {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    margin-top: 40px;
    padding-bottom: 80px;
}
.box4 .article-list .article-item {
    width: 478px;
    display: block;
}
.box4 .article-list .article-item .image {
    width: 478px;
    height: 290px;
}
.box4 .article-list .article-item .video {
    width: 478px;
    height: 290px;
    object-fit: cover;
}
.box4 .article-list .article-item .image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.box4 .article-list .article-item .play-btn {
    position: relative;
    top: -176px;
    width: 100%;
    height: 0;
}
.box4 .article-list .article-item .play-btn a {
    display: block;
    margin: 0 auto;
    width: 60px;
    height: 60px;
}
.box4 .article-list .article-item .play-btn a img {
    width: 100%;
    height: 100%;
}
.box4 .article-list .article-item .a-info {
    font-weight: 400;
    font-size: 22px;
    color: #232323;
    line-height: 36px;
    margin-top: 20px;
}

.hidden {
    display: none;
}