.ibanner {
    background-position:top center;
    background-repeat:no-repeat;
    background-size: cover;
    padding: 180px 20% 40px 20%;
}
.ibanner{
    color: #fff;
}
.ibanner h3{
    font-size: 30px;
    margin-bottom: 15px;
}
.ibanner p{
    font-size: 16px;
    font-family: Arial;
}
.ibanner .wire{
    width: 100px;
    height: 1px;
    background-color: #fff;
    margin-bottom: 5px;
}
.ibanner .mbnav{
    margin-top: 115px;
}
.ibanner .mbnav a{
    color: #fff;
}
.ibanner .container{
    padding: 0;
}
.ibanner .container .row{
    margin: 0;
    padding: 0;
}
.ibanner .about-content {
    padding: 0;
}

.case_c {
    padding-top: 80px;
}
.case_c .container {
    padding: 0;
}
.case_c .container .row {
    margin-bottom: -30px;
}
.case_c .container .row > div {
    margin-bottom: 30px;
}
.case_c .item {
    overflow: hidden;
    cursor: pointer;
    position: relative;
}
.case_c .item img {
    max-width: 100%;
}
.case_c_show {
    width: 100%;
    height: 25%;
    position: absolute;
    bottom: 0;
    background: rgba(0,0,0,.6);
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all .5s;
    -o-transition: all .5s;
    -moz-transition: all .5s;
    -webkit-transition: all .5s;
}
.case_c_show-title {
    font-size: 16px;
    transition: all .5s;
    -o-transition: all .5s;
    -moz-transition: all .5s;
    -webkit-transition: all .5s;
}
.case_c_show .case_c_hide {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
    transition: all .5s;
    -o-transition: all .5s;
    -moz-transition: all .5s;
    -webkit-transition: all .5s;
    font-size: 12px;
    display: none;
    position: relative;
}
.icon-youjiantou::before {
    font-size: 12px;
}
.case_c_show .case_c_hide::after {
    content: '';
    width: 100%;
    height: 1px;
    background-color: #ffffff;
    position: absolute;
    left: 0;
    bottom: -10px;
}
.case_c .item:hover .case_c_show {
    height: 100%;
}
.case_c .item:hover .case_c_show-title {
    font-size: 20px;
}
.case_c .item:hover .case_c_hide {
    display: block;
    animation: fade-in .5s;
}
@keyframes fade-in {  
    0% {opacity: 0;}
    100% {opacity: 1;}
}

@media (max-width:1200px) {
    .ibanner {
        background-position:top center;
        background-repeat:no-repeat;
        background-size: cover;
        padding: 130px 10% 40px 10%;
    }
    .ibanner .mbnav{
        margin-top: 80px;
    }
}

@media (max-width: 992px) {
    .case_c {
        padding-top: 50px;
    }
}

@media (max-width:768px) {
    .ibanner {
        background-position:top center;
        background-repeat:no-repeat;
        background-size: cover;
        padding: 90px 10% 40px 10%;
    }
    .ibanner .mbnav{
        margin-top: 80px;
    }
}
@media (max-width:576px) {
    .ibanner {
        background-position:top center;
        background-repeat:no-repeat;
        background-size: cover;
        padding: 60px 10% 20px 10%;
    }
    .ibanner .mbnav{
        margin-top: 20px;
    }
    .ibanner h3{
        font-size: 20px;
        margin-bottom: 10px;
    }
    .ibanner .wire{
        width: 60px;
        height: 1px;
        background-color: #fff;
        margin-bottom: 5px;
    }
    .ibanner p{
        font-size: 12px;
    }
    .ibanner .mbnav a{
       font-size: 12px;
    }
    
    .case_c {
        padding-top: 30px;
    }
    .case_c .container {
        padding-left: 15px;
        padding-right: 15px;
    }
    .case_c .container .row {
        margin-left: -6px;
        margin-right: -6px;
        margin-bottom: -15px;
    }
    .case_c .container .row > div {
        margin-bottom: 15px;
        padding-left: 6px;
        padding-right: 6px;
    }
}