.pro_sum{margin: 0px auto;padding: 0px  0;}
.pro_sum a{
    width: 22.75%;
    float: left;
    margin-bottom: 20px;
    margin-left: 3%;
    box-sizing: border-box;
    padding: 15px;
    border:1px solid rgba(0,0,0,.1);
    font-size: 13px;
    line-height: 1.5;
    cursor: pointer;
    background: #FFFFFF;
}
.pro_sum a.end img{
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);
    filter: grayscale(100%);
    filter: gray;
}
.pro_sum a:nth-child(4n - 3){
    margin-left: 0;
}
.pro_sum .t2{
    padding: 10px 0;
    font-size: 13px;
    color: #333333;
    font-weight: bold;
}
.pro_sum .t3{
    line-height: 1.5;
    color: #666666;
}
.pro_sum .t4{
    text-align: right;
    margin-top: 10px;

}
.pro_sum a.do .t4{
    color: #dd2727;
    font-weight: bold;
}
.pro_sum a.end .t4{
    color: #666;
}
.pro_sum a .t4{
    color: #2f318b;
}
@media screen and (max-width: 1230px) {
    .mian1{
        margin-bottom: 0;
    }
}
@media screen and (max-width: 1000px) {
    .pro_sum a:nth-child(4n - 3),.pro_sum a{
        width: 48%;
        margin-left: 0;
        vertical-align: top;
    }
    .pro_sum a:nth-child(even){
        margin-left: 4%;
    }
    .pro_sum .t3{
        font-size: 12px;
    }
}
@media screen and (max-width: 480px) {
    .pro_sum a:nth-child(4n - 3),
    .pro_sum a{
        width: 100%;
    }
    .pro_sum a:nth-child(even){
        margin-left: 0;
    }
    .pro_sum a:last-child{
        margin-bottom: 0;
    }
}