.nav a:first-of-type {
    background-color: #fff;
    color: #333;
}

.nav a:first-of-type:hover {
    background-color: #FF6600;
    color: #fff;
}

.nav a:nth-of-type(2) {
    background-color: #FF6600;
    color: #fff;
}

.banner {
    width: 100%;
    height: 100%;
}
.content {
    text-align: center;
}
.part-1 {
    margin-top: 80px;
}
.main {
    /* width: 1200px; */
    margin: 0 auto;
}
.name {
    height: 84px;
    line-height: 84px;
    position: relative;
}
.main .part-title {
    font-size: 60px;
    color: #4A4A4A;
    font-weight: 500;
    position: relative;
}
.part-title::before, .part-title::after {
    content: '';               
    position: absolute;        
    top: 52%;
    background: #4A4A4A;      
    width: 29px;
    height: 2px;
}
.part-title:before{
    left: -40px;  
}
.part-title:after {
    left: 250px;
}
.main .part-line {
    display: inline-block;
    font-size: 30px;
    color: #4A4A4A;
}
.main .part-1 .img>.img-row {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 30px;
}
.main .part-1 .img-row .img-item {
    width: 214px;
    text-align: center;
    margin-left: 87px;
}
.main .part-1 .img-row .img-item img {
    width: 100%;
    height: 183px;
}
.part-2 {
    margin-top: 50px;
}
.part-2 .img {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.part-2 .img img {
    display: block;
    width: 932px;
    height: 282px;
    margin-top: 30px;
}
.part-3 {
    margin-top: 80px;
}
.part-3 .img {

}
.part-3 .img .img-row {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.part-3 .img .img-row:nth-of-type(2) {
    margin-top: 40px;
}
.part-3 .img .img-row .img-item {
    margin-left: 20px;
    position: relative;
    text-align: center;
}
.part-3 .img .img-row .img-item .hover {
    width: 300px;
    height: 186px;
    background-color: #0047C6;
    z-index: 9999;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0.8;
    display: none;
}
.part-3 .img .img-row .img-item img {
    width: 300px;
    height: 186px;
}
.part-3 .img .img-row .img-item .img-name {
    display: inline-block;
    font-size: 30px;
    color: #fff;
    letter-spacing: 1px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 9999;
    display: none;
}
.part-3 .img .img-row .img-item .line {
    width:46px;
    height:2px;
    background:rgba(255,255,255,1);
    border-radius:2px;
    position: absolute;
    top: 52%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 9999;
    display: none;
}
.part-4 {
    margin-top: 80px;
    padding-bottom: 261px;
}
.part-4 .img {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 40px;
    height: 330px;
}
.part-4 .img .img-item {
    width:225px;
    height:300px;
    background:rgba(255,255,255,1);
    box-shadow:3px 0px 6px 4px rgba(159,168,186,0.2);
    border-radius:10px;
    text-align: center;
    margin-left: 61px;
    font-size: 30px;
}
.part-4 .img img {
    display: block;
    width: 100px;
    height: 100px;
    margin-top: 61px;
    margin-left: 63px;
    margin-bottom: 21px;
}