.w{
    width: 80% !important;
}

/* 教学环境 */
.choose-part {
    margin-top: 46px;
}
.choose-body {
    margin-top: 34px;
    position: relative;
}
section {
    display: flex;
    flex-wrap: wrap;
    padding: 15px 5px 0;
}
section::after {
    content: "";
    flex-grow: 9999;
    /*background-image: url("../images/lastNavItemBG.jpg");*/
}
section .img-wrapper {
    flex-grow: 1;
    margin: 5px;
    position: relative;
    overflow: hidden;
}
section .img-wrapper img {
    height: 260px;
    min-width: 100%;
    object-fit: cover;
}
section .img-wrapper .videopupo {
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    position: absolute;
    top: 0;
    left: 0;
}
section .img-wrapper .videopupo img{
   position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 80px;
    height: 80px;
    min-width: 0;
    pointer-events: none;
}
section .img-wrapper .info {
    position: absolute;
    bottom: 0px;
    color: #ffffff;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.3);
    line-height: 30px;
    height: 0px;
}
section .img-wrapper .info span{
    padding: 0 10px;
    font-size: 14px;
}
section .img-wrapper:hover .info {
    height: 30px;
    transition: all 0.5s;
}
section .img-wrapper:hover {
    animation: big 1s forwards;
}

.lastNavItem {
    text-align: center;
    cursor: pointer;
    user-select: none;
    background: #fff;
    color: #fff;
    background-image: url("../images/lastNavItemBG.jpg");
    background-size: cover;
    width: 600px;
    height: 260px;
    margin: 5px 10px;
    display: none;
    position: absolute;
    bottom: 0;
    right: 0;
}
.lastNavItem .lastNavItem-pos {
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto;
    height: 80px;
    width: 100%;
}
.lastNavItem .moreicon {
    background-image: url("../images/moreicon.png");
    background-size: cover;
    display: inline-block;
    width: 60px;
    height: 60px;
    margin-top: 10px;
}
.lastNavItem p {
    display: inline-block;
    font-size: 26px;
    line-height: 80px;
    vertical-align: top;
    text-align: left;
    margin-left: 18px;
}
.lastNavItem p:hover {
    font-size: 30px;
    color: #ff6637;
}
.popup_wrap{
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 2015;
    display: none;
}
.popup_wrap .popup_bg{
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    position: relative;
}
.popup_wrap .video_close{
    background-color: rgba(0, 0, 0, .5);
    border-radius: 50%;
    cursor: pointer;
    height: 80px;
    overflow: hidden;
    position: absolute;
    right: -40px;
    top: -40px;
    width: 80px;
}
.popup_wrap .video_close:hover{
    transform: scale(1.2);
}
.popup_wrap .video_close svg{
    width: 16px;
    height: 16px;
    color: #fff5d4;
    position: absolute;
    left: 18px;
    bottom: 16px;
}
.popup_wrap .videobox{
    width: 80%;
    height: 70%;
    background-color: rgba(0,0,0,1);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

.popup_wrap .videobox video{
    width: 100%;
    height: 100%;
}