.video {
    position: relative;
    width: 100%;
    height: 16em;
}
.video .box2 {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 100;
}
.video .box2 img {
    display: block;
    width: 100%;
    height: 100%;
}
.video .box2 .mask {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.3);
}
.video .box2 .btn_play {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 2.5rem;
    height: 2.5rem;
}
.video .box2 .look {
    position: absolute;
    left: 0;
    bottom: 0;
    color: #fff;
    z-index: 111;
    height: 2rem;
    line-height: 2rem;
    background-color: rgba(0,0,0,.4);
    width: 94%;
    padding: 0 3%;
    font-size: 13px;
    text-align: left;
}
.video video {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 16em;
}
.miaoshu {
    color: #a2a2b6;
    text-align: justify;
    font-size: 13px;
    line-height: 1.5;
    margin: 5px 0 0;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;

}
.video_list{
    padding-top: 2em;
    overflow: hidden;
}
.video_list li{
    float: left;
    width: 48.5%;
    padding-bottom: 44px;
    list-style: none;
}
.video_list li:nth-child(2n+1){
    margin-right: 1.5%;
}
.video_list li:nth-child(2n){
    margin-left: 1.5%;
}
.video_list li .video,
.video_list li .video video {
    height: 7rem;
}
.video_list li .video .box2 .btn_play {
    width: 1.5rem;
    height: 1.5rem;
}
.video_list .box2 .look {
    height: 1.5rem;
    line-height: 1.5rem;
    font-size: 12px;
}
.video_list li .miaoshu {
    /*height: 2rem;*/
    font-size: 12px;
}
.last{
    text-align: center;
    margin-top: 5%;
    margin-bottom: 2%;
}
.last p{
    color: #a2a2b6;
    font-size: 12px;
    line-height: 1.8;
    margin: 0;
}
.last p a{
    text-decoration: none;
    color: #a2a2b6;
    font-size: 12px;
}
.swiper-slide{
    cursor: pointer;
}
.lp_li_a{
    display: block;
    height: 100%;
}
.yin{
    text-align: center;
    display: none;
}
.yin img{
    width: 20px;
    transform: rotate(180deg);
}
.xianshi{
    text-align: center;
}
.xianshi img{
    width: 20px;
}
@media (min-width: 640px){
    body{
        text-align: center;
    }
    .waike{
        max-width: 640px;
        margin: auto;
    }
    .video,
    .video video{
        height: 25em;
    }
    .video .box2 .btn_play {
        height: 5em;
        width: 5em;
    }
    .video_list li .video .box2 .btn_play {
        width: 2em;
        height: 2em;
    }
    .video_list li .video,
    .video_list li .video video {
        height: 15em;
    }
    .video .box2 .look,
    .video_list .box2 .look{
        height: 3em;
        line-height: 3em;
    }
    #nav .swiper-slide span{
        font-size: 18px;
    }
}