.demo{
    padding: 1em 0;
}
.box{
    position: relative;
    perspective: 1000px;
}
.box .box-img{
    transform: rotateY(0);
    transition: all 0.50s ease-in-out 0s;
}
.box:hover .box-img{
    transform: rotateY(-90deg);
}
.box .box-img img{
    width: 100%;
    height: 300px;
}
.box .box-content{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    padding: 60px 20px;
    text-align: center;
    background: rgba(0,0,0,0.7);
    transform: rotateY(90deg);
    transition: all 0.50s ease-in-out 0s;
}
.box:hover .box-content{
    transform: rotateY(0);
}
.box .title{
    font-size: 20px;
    color: #fff;
    text-transform: uppercase;
}
.box .description{
    font-size: 14px;
    line-height: 24px;
    color: #fff;
}
.box .title:after,
.box .description:after{
    content: "";
    width: 80%;
    display: block;
    border-bottom: 1px solid #fff;
    margin: 15px auto;
}
.box .social-links{
    margin: 0;
    padding: 0;
    list-style: none;
}
.box .social-links li{
    display: inline-block;
    margin: 0 10px;
}
.box .social-links li a{
    font-size: 20px;
    color: #a6a6a6;
}
.box .social-links li a:hover{
    text-decoration: none;
    color: #fff;
}
@media only screen and (max-width: 990px) {
    .box{  margin-bottom:20px; }
}
@media only screen and (max-width: 479px) {
    .box .box-content{ padding: 20px; }
}


/* 手风琴 */
img{border:0px;}


/*瑞丽深度开始*/
.flash4{width:1200px;height:450px;margin:0px auto;margin-bottom:20px;position:relative;}
.flash4 ul li{width:106px;height:450px;border-left:1px solid #000;position:relative;overflow:hidden;float:left;}
.flash4 ul li .imgTop img{opacity:0.4;}
.flash4 ul li .imgTop img.tm{opacity:1;}

.flash4 ul li .imgCon{width:538px;height:405px;}
.flash4 ul li .imgCen{width:538px;height:50px;background:rgba(0,0,0,0.5);color:#fff;font-size:20px;line-height:50px;position:absolute;left:0px;bottom:45px;text-indent:20px;display:none;}
.flash4 ul li .imgBot{width:538px;height:45px;background:#222;}
.flash4 ul li .imgBot p.bt_1{width:80px;line-height:45px;font-size:16px;color:#fff;text-indent:20px;float:left;}
.flash4 ul li .imgBot p.bt_2{width:458px;height:45px;line-height:45px;float:left;display:none;}
.flash4 ul li .imgBot p.bt_2 span{font-size:14px;color:#fff;padding-right:30px;background:url(../images/part2_icon.png)no-repeat left center;padding-left:10px;}

/* .flash4 ul li.first{width:538px;}
.flash4 ul li.fast{position:absolute;right:0px;bottom:0px;} */