*{
    margin: 0;
    padding: 0;
}

.container{
    width: 1200px;
    margin: 0 auto;
}
ul li {
    list-style: none;
}



/* start */

.case-wrapper{
    overflow: hidden;
}
.case-wrapper .item{
    float: left;
    position: relative;
    margin-bottom: 65px;
    cursor: pointer;
}
.case-wrapper .item:nth-of-type(2n){
    float: right;
}
.case-wrapper .item img{
    display: block;
    width: 578px;
    height: 332px;
    object-fit: cover;
    border: 0px;
}
.case-wrapper .item .title{
    position: absolute;
    bottom: 0;
    width:100%;
    height: 65px;
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
    line-height: 65px;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.5);
}


/* 弹出层样式 */
.bigPic-box{
    display: none;
    position: fixed;
    top: 0p;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    min-width: 1200px;
    height: 100%;
    background-color: rgba(0, 0, 0, 1);
    user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.bigPic-box .bigPic-img{
    width: calc(100% - 440px);
    height: calc(100% - 60px);
    object-fit: contain;
    object-position: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 101;
}
.close-btn{
    position: absolute;
    top: 30px;
    right: 36px;
    width: 24px;
    height: 24px;
    cursor: pointer;
}
.bigPic-button{
    width: 100%;
    height: 123px;
    background-image: url(../images/bigPic-btn-bg.png);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}
#bigPic-prev{
    width:23px;
    height: 123px;
    background-image: url(../images/bigPic-prev-icon.png);
    background-repeat: no-repeat;
    background-position: center;
    position: absolute;
    left: 160px;
    cursor: pointer;
}
#bigPic-next{
    width:23px;
    height: 123px;
    background-image: url(../images/bigPic-next-icon.png);
    background-repeat: no-repeat;
    background-position: center;
    position: absolute;
    right: 160px;
    cursor: pointer;
}
.bigPic-infor{
    width: 180px;
    text-align: center;
    position: absolute;
    top: 30px;
    left: 20px;
    color: #ffffff;
    font-size: 24px;
}
.bigPic-infor .title{
    margin-bottom: 4px;
}

/* 底部 */
.case-b{
    margin-bottom: 50px;
}
.case-b .t1{
    font-size: 60px;
    font-weight: bold;
    color: #ea5504;
}
.case-b .t2{
    font-size: 24px;
    color: #ea5504;
    margin-bottom: 50px;
}
.case-b .wrapper{
    border-left: 1px solid #ea5504;
    border-right: 1px solid #ea5504;
}
.case-b .wrapper ul{
    column-count:5;
    column-gap:0px;
    column-rule-style:solid;
    column-rule-width: 1px;
    column-rule-color: #ea5504;
    
    /* Firefox */
    -moz-column-count:5;
    -moz-column-gap:0px;
    -moz-column-rule-width: 1px;
    -moz-column-rule-style:solid;
    -moz-column-rule-color: #ea5504;
    
    /* Safari and Chrome */
    -webkit-column-count:5;
    -webkit-column-gap:0px;
    -webkit-column-rule-width: 1px;
    -webkit-column-rule-style:solid;
    -webkit-column-rule-color: #ea5504;
}
.case-b .wrapper ul li {
    padding-left: 40px;
    line-height: 25px;
}