.content {
    width: 100%;
    margin: 50px 0;
    margin-top: 10px;
    background-color: #f7f8fa;
}

.content-first {
    margin: 0 auto;
    width: 100%;
    /*height: 285px;*/
    font-size: 0;
}

.content-first-item {
    /*margin-left: 21px;*/
    margin-top: 20px;
    /*display: inline-block;*/
    width: 100%;
    height: 285px;
    background-color: white;
    box-shadow: 0px 0px 4px rgba(0, 0, 0, 0.1);
    display: flex;
}
.content-first-item:first-child{
    margin-top: 0;
}
.content-first-item:hover {
    box-shadow: 0px 0px 16px rgba(0, 0, 0, 0.1);
}

.content-first-item-margin {
    margin-left: 0;
}

.item-img {
    float: left;
    margin-left: 37px;
    margin-top: 40px;
    width: 60px;
    height: 60px;
    flex-shrink: 0;
}

.item-right {
    flex: 1;
    width: 0;
    float: left;
    margin-left: 20px;
    margin-top: 30px;
}

.item-title {
    font-size: 18px;
    color: #4A4A4A;
    font-weight: bold;
}

.item-ul {
    width: 100%;
}

.item-li {
    margin-top: 5px;
    width: 100%;
    height: 40px;
    font-size: 14px;
    color: #4A4A4A;
}

.item-li:hover {
    background-color: #EEF4FC;
    color: #003399;
    cursor: pointer;
}

.item-li:hover .item-li-block {
    background-color: #EEF4FC;
}

.item-li:hover .item-li-img {
    display: inline;
}

.item-li-first {
    margin-top: 10px;
}
.third-item-sub-select .item-li-block{
    margin-top: 0;
}
.third-item-sub-select .item-li-img{
    margin-top: 0;
}

.item-li-block {
    vertical-align: middle;
    display: inline-block;
    background-color: #FFCC00;
    width: 6px;
    height: 6px;
    float: left;
    margin-top: 17px;
}

.item-li-title {
    /*width: 205px;*/
    line-height: 40px;
    vertical-align: middle;
    display: inline-block;
    float: left;
    margin-left: 5px;
}

.item-li-img {
    vertical-align: middle;
    display: none;
    width: 6px;
    height: 11px;
    float: right;
    margin-top: 14.5px;
    margin-right: 10px;
}

.content-second {
    margin: 0 auto;
    margin-top: 50px;
    /*width: 1200px;*/
}

.content-second-title {
    margin-top: 0px;
    text-align: center;
    font-size: 40px;
    color: #4A4A4A;
}

.content-second-first {
    margin-top: 40px;
    font-size: 0;
}

.content-second-first a {
    text-decoration: none;
    background-color: white;
}

.content-second-second {
    margin-top: 20px;
}

.second-item-bg {
    /*margin-left: 18.6px;*/
    margin-top: 18px;
    display: inline-block;
    width: 100%;
    height: 277px;
    background-color: white;
    box-shadow: 0px 0px 4px rgba(0, 0, 0, 0.1);
}
.second-item-bg:first-child{
    margin-top: 0;
}
.second-item-bg:hover {
    box-shadow: 0px 0px 16px rgba(0, 0, 0, 0.1);
}

.second-item-bg-margin {
    margin-left: 0;
}

.second-item-bg:hover {
    cursor: pointer;
}

.second-item-bg:hover .second-item-title {
    color: #003399;
}

.second-item-img {
    margin: 0px auto;
    margin-top: 50px;
    display: block;
    width: 70px;
    height: 70px;
}

.second-item-title {
    margin-top: 25px;
    margin-bottom: 10px;
    text-align: center;
    font-size: 18px;
    color: #4A4A4A;
}

.second-item-sub-title {
    text-align: center;
    font-size: 14px;
    color: #9B9B9B;
}

.content-thrid {
    margin-top: 50px;
    width: 100%;
    background-color: white;
}

.content-thrid-bg {
    margin: 0 auto;
    /*width: 1200px;*/
    background-color: white;
}

.content-thrid-sub {
    /*width: 1200px;*/
    padding: 0 10px;
}

.third-item-bg {
    /*margin-left: 21px;*/
    margin-top: 20px;
    /*display: inline-block;*/
    width: 100%;
    height: 205px;
    background-color: white;
    box-shadow: 0px 0px 4px rgba(0, 0, 0, 0.1);
    display: flex;
}
.third-item-bg:first-child{
    margin-top: 0;
}
.third-item-bg:hover {
    box-shadow: 0px 0px 16px rgba(0, 0, 0, 0.1);
}

.no-margin-left {
    margin-left: 0px;
}

.margin-top-20 {
    margin-top: 20px;
}

.third-item-bg-sub {
    margin-top: 20px;
}

.third-item-sub-select {
    /* width: 346px; */
    width: 100%;
    display: flex;
    align-items: center;
}

.third-item-sub-title {
    width: 315px;
}

.third-white-gap {
    width: 100%;
    height: 50px;
    background-color: white;
}


/* video */

.mask {
    position: fixed;
    left: 0%;
    top: 0%;
    background-color: rgba(0, 0, 0, 0.5);
    width: 100%;
    height: 100%;
}

.videos {
    font-family: Microsoft YaHei;
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    z-index: 100;
    display: block;
}

.vclose {
    font-family: Microsoft YaHei;
    position: absolute;
    right: 3%;
    top: -30%;
    border-radius: 100%;
    width: 2.4rem !important;
    height: 2.4rem !important;
    border: none;
    z-index: 99999;
}