.s4 {
    font-size: 0;
    width: 100%;
    padding-bottom: 25%;
    height: 0;
    overflow: hidden;
}

.s4 .item {
    border-top: 5px solid #fff;
    width: 25%;
    height: 0;
    padding-bottom: 25%;
    position: relative;
    overflow: hidden;
    margin: 0;
    font-size: 0;
    display: inline-block;
}
.s4 .item > a,.s4 .item a.ita{
    display: block;
    position: absolute;
    overflow: hidden;
    width: 100%;
    height: 100%;
    right: 4px;
}
.s4 .item:hover {
    cursor: pointer;
}

.s4 .item.des .describe .h5 a:hover, .s4 .item.des describe .h5 a:active {
    color: #e41839;
}

.s4 .item.item2 {
    width: 50%;
}

.s4 .item img {
    position: absolute;
    width: 100%;
    height: 100%;
    border-left: 5px solid #fff;
    /*! left: -10px; */
}

.s4 .item.des .img {
    position: absolute;
    height: 50%;
    width: 100%;
    overflow: hidden;
}

.s4 .item.des img {
    height: 100%;
}

.s4 .item.des .describe {
    box-sizing:border-box;
    padding-left:10px;
    padding-right:10px;
    position: absolute;
    top: 50%;
    z-index: 50;
    /* left: 10px; */
    margin-top: .1rem;
    width: 100%;
}

.s4 .item.des.txt .describe {
    z-index: 50;
    width: 95%;
    padding-left: 5%;
    left: 0;
    top: 50%;
    width: 100%;
    transform: translateY(-50%);
}

.s4 .item.des .describe .h3 {
    font-size: 34px;
    font-family: "Microsoft YaHei";
    color: rgb(51, 51, 51);
    font-weight: bold;
    line-height: 2.2;
}

.s4 .item.des .describe .h4 {
    font-size: .16rem;
    font-family: "Microsoft YaHei";
    color: rgb(51, 51, 51);
    line-height: 1.875;
    overflow : hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    /* -webkit-line-clamp: 2;
     -webkit-box-orient: vertical;*/
}

.s4 .item.des .describe .h5 a {
    font-size: .14rem;
    font-family: "Microsoft YaHei";
    color: rgb(51, 51, 51);
    font-weight: bold;
    line-height: 3;
    /* padding-top: 5%; */
}

.s4 .item .cover {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(../images/blank30.png);
    opacity: 0;
    -webkit-transition: opacity .2s;
    transition: opacity .2s;
    border-right: 5px solid #fff;
    left: -4px;
}

.s4 .item:hover .cover, .s4 .item:active .cover {
    opacity: 1;
}

.s4 .item:hover img {
    transform: scale(1.3) rotate(0deg);
    -webkit-transform: scale(1.3) rotate(0deg);
    -moz-transform: scale(1.3) rotate(0deg);
    -o-transform: scale(1.3) rotate(0deg);
    transition: all 0.5s;
    -moz-transition: all 0.5s;
    -webkit-transition: all 0.5s;
    -o-transition: all 0.5s;
}

.prop {
    position: absolute;
    top: 50%;
    left: 2%;
    width: 96%;
    text-align: center;
    -webkit-transform: translate(0, -60%);
    -ms-transform: translate(0, -60%);
    transform: translate(0, -60%);
}

.prop p {
    color: #fff;
    font-size: .3rem;
}

.prop p a {
    color: #fff;
    text-decoration: none;
}
.s4 .item .cover2 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,.7);
    opacity: 0;
    -webkit-transition: opacity .2s;
    transition: opacity .2s;
    /*! left: -4px; */
}
.s4 .item .cover2 .prop2{
    box-sizing: border-box;
    padding:30px;
    position: absolute;
    bottom:0;
    line-height: 2;
    color:#fff;
    font-size: 18px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.s4 .item .cover2 .prop2:before{
    content: "";
}
.s4 .item:hover .cover2, .s4 .item:active .cover2 {
    opacity: 1;
}
@media all and (max-width: 960px) {
    .s4 {
        padding-bottom: 100%;
        box-sizing: border-box;
    }

    .s4 .item {
        padding-bottom: 50%;
        width: 50%;
    }

    .s4 .item .cover {
        height: 100%;
    }

    .s4 .item.item2 {
        width: 100%;
    }

    .s4 .item img {
        height: 100%;
    }

    .s4 .item.des.old .describe .h3 {
        font-size: .4rem;
    }

    .s4 .item.des.old .describe .h4 {
        font-size: .14rem;
        max-width:100%;
        line-height: 1.3;
        white-space: nowrap;
    }

    .s4 .item.des.old .describe .h5 a {
        line-height: 1;
        display:none;
    }
}

.ptit1 {
    font-size: .3rem;
    margin-top: .45rem;
    color: rgb(51, 51, 51);
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-bottom: .1rem;
}

.ptit2 {
    font-size: .14rem;
    color: rgb(51, 51, 51);
    line-height: .3rem;
    padding-bottom: 5%;
}