.banner {
    width: 100%;
    min-width: 1200px;
    height: 476px;
    background: url('../img/banner2.jpg') center center / cover no-repeat;
    overflow: hidden;
    text-align: center;
}
.banner > .title,
.banner > .title-en {
    font-size: 36px;
    color: #FFFFFF;
    margin-top: 12px;
}
.banner > .title {
    margin-top: 220px;
}
.tab-wrap {
    width: 100%;
    min-width: 1200px;
    background: #FFFFFF;
    box-shadow: 0px 2px 12px 0px rgba(204, 204, 204, 0.2);
    position: relative;
}
.tab {
    width: 1200px;
    height: 70px;
    margin: 0 auto;
    overflow: hidden;
}
.tab::after {
    content: '';
    clear: both;
}
.tab > .item {
    width: 160px;
    line-height: 70px;
    font-size: 16px;
    color: #212121;
    text-align: center;
    float: left;
    cursor: pointer;
    display: block;
}
.tab > .item.active {
    color: #FFFFFF;
    background: #E5191A;
}
.tab-content {
    width: 1200px;
    margin: 0 auto;
}
.tab-content > .item {
    width: 100%;
    display: none;
}
.tab-content > .item.active {
    display: block;
}
.tab-content > .item.introduction {
    background: url('../img/about/gongsijianjiebeijing.png') center center / cover no-repeat;
    padding-bottom: 152px;
}
.tab-content > .item.development {
    background: url('../img/about/gongsijianjiebeijing.png') center center / cover no-repeat;
}
.tab-content > .item > .title {
    font-size: 24px;
    color: #212121;
    margin-top: 60px;
    text-align: center;
}
.tab-content > .item > .title2 {
    margin-top: 60px;
    overflow: hidden;
}
.tab-content > .item > .title2::after {
    content: '';
    clear: both;
}
.tab-content > .item > .title2 .item {
    float: left;
    margin-right: 40px;
    font-size: 18px;
    color: #666666;
    cursor: pointer;
}
.tab-content > .item > .title2 .item:last-child {
    margin-right: 0;
}
.tab-content > .item > .title2 .item.active {
    color: #E5191A;
    font-weight: bold;
}
.introduction .content {
    font-size: 16px;
    color: #666666;
    margin-top: 40px;
    line-height: 32px;
}
.introduction .content p {
    text-indent: 2em;
}
.introduction .list {
    margin-top: 80px;
    width: 1200px;
    overflow: hidden;
}
.introduction .list::after {
    content: '';
    clear: both;
}
.introduction .list .item {
    width: 25%;
    float: left;
    text-align: center;
}
.introduction .list .item .top {
    font-size: 48px;
    color: #E5191A;
}
.introduction .list .item .top.text {
    font-size: 36px;
    margin-top: 10px;
}
.introduction .list .item .top span {
    font-size: 18px;
}
.introduction .list .item .bottom {
    font-size: 16px;
    color: #000000;
}
.introduction .list .item .bottom.text {
    margin-top: 6px;
}
.development .list-wrap {
    margin-top: 40px;
    margin-bottom: 92px;
    overflow: hidden;
}
.development .list-wrap::after {
    clear: both;
    content: '';
}
.development .list-wrap .left {
    width: 400px;
    float: left;
}
.development .list-wrap .left .nav {
    position: relative;
    margin-left: 124px;
    margin-top: 15px;
}
.development .list-wrap .left .nav::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 4px;
    width: 1px;
    height: 100%;
    background: #E7E7E7;
}
.development .list-wrap .left .nav li {
    padding: 25px 0;
}
.development .list-wrap .left .nav li:first-child {
    padding-top: 0;
}
.development .list-wrap .left .nav li .round {
    width: 9px;
    height: 9px;
    background: #E5191A;
    border-radius: 50%;
    display: inline-block;
    position: relative;
    vertical-align: middle;
}
.development .list-wrap .left .nav li .year {
    font-size: 14px;
    color: #999999;
    margin-left: 14px;
    vertical-align: middle;
}
.development .list-wrap .left .nav li.active .year {
    font-size: 18px;
    font-weight: bold;
    color: #E5191A;
}
.development .list-wrap .right {
    width: 800px;
    float: right;
}
.development .list-wrap .right .nav-item {
    display: none;
}
.development .list-wrap .right .nav-item.active {
    display: block;
}
.development .list-wrap .right .list .item {
    padding: 20px 0;
    border-bottom: 1px solid #EFEFEF;
}
.development .list-wrap .right .list .item:first-child {
    padding-top: 0;
}
.development .list-wrap .right .list .item:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}
.development .list-wrap .right .list .item .list-title {
    font-size: 16px;
    color: #212121;
    line-height: 32px;
}
.development .list-wrap .right .list .item .year {
    font-size: 14px;
    color: #757575;
    margin-top: 10px;
}
.organization .img-wrap {
    margin-bottom: 154px;
    text-align: center;
}
.organization .img-wrap img {
    width: 966px;
}
.atlas .list-wrap {
    margin-bottom: 90px;
}
.atlas .list {
    padding-top: 50px;
    padding-bottom: 48px;
    overflow: hidden;
}
.atlas .list::after {
    content: '';
    clear: both;
}
.atlas .list .item {
    width: 382px;
    height: 410px;
    float: left;
    margin-right: 27px;
    margin-top: 30px;
    background: #FFFFFF;
    box-shadow: 0px 0px 24px 0px rgba(204, 204, 204, 0.4);
    display: block;
    cursor: pointer;
    transition: all .3s;
}
.atlas .list .item:hover {
    transform: translateY(-10px);
}
.atlas .list .item:nth-child(3n+3) {
    margin-right: 0;
}
.atlas .list .item:nth-child(-n+3) {
    margin-top: 0;
}
.atlas .list .item .top {
    width: 100%;
    height: 231px;
    overflow: hidden;
}
.atlas .list .item .top img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all .3s;
}
.atlas .list .item .top img:hover {
    transform: scale(1.1);
}
.atlas .list .item .bottom {
    padding: 0 20px;
}
.atlas .list .item .bottom .title {
    font-size: 18px;
    color: #333333;
    line-height: 32px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
    margin-top: 32px;
    min-height: 64px;
}
.atlas .list .item .bottom .time {
    margin-top: 28px;
    font-size: 18px;
    color: #666666;
}
.atlas .list .item2 {
    width: 280px;
    float: left;
    margin-right: 26.6666px;
    margin-top: 30px;
    display: block;
    cursor: pointer;
    transition: all .3s;
}
.atlas .list .item2:hover {
    transform: translateY(-10px);
}
.atlas .list .item2:nth-child(4n+4) {
    margin-right: 0;
}
.atlas .list .item2:nth-child(-n+4) {
    margin-top: 0;
}
.atlas .list .item2 .top {
    width: 100%;
    height: 188px;
    overflow: hidden;
}
.atlas .list .item2 .top img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all .3s;
}
.atlas .list .item2 .top img:hover {
    transform: scale(1.1);
}
.atlas .list .item2 .bottom {
    padding: 0 20px;
    text-align: center;
}
.atlas .list .item2 .bottom .title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-top: 16px;
}
.tab-content .tab-item.video {
    width: 1070px;
    margin: 0 auto;
}
.video .hot-video {
    width: 680px;
    margin: 56px auto 0;
}
.video .hot-video .img-wrap {
    width: 100%;
    height: 382px;
    display: block;
    position: relative;
}
.video .hot-video .img-wrap .img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video .hot-video .img-wrap .jixu {
    width: 104px;
    height: 104px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.video .hot-video .video-title {
    margin-top: 20px;
    padding: 0 20px;
    font-size: 20px;
    color: #212121;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.video .sub-title {
    margin-top: 78px;
    font-size: 20px;
    color: #333333;
}
.video .list {
    padding-top: 12px;
    padding-bottom: 80px;
    overflow: hidden;
}
.video .list::after {
    content: '';
    clear: both;
}
.video .list .item {
    width: 328px;
    float: left;
    margin-right: 43px;
    margin-top: 40px;
    display: block;
}
.video .list .item:nth-child(3n+3) {
    margin-right: 0;
}
.video .list .item .top {
    width: 100%;
    height: 184px;
}
.video .list .item .top img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video .list .item .bottom {
    padding: 0 20px;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-top: 20px;
}