.bodytitle{
    width: 50%;
    margin:80px auto;
    display: -webkit-box; /* Chrome 4+, Safari 3.1, iOS Safari 3.2+ */
    display: -moz-box; /* Firefox 17- */
    display: -webkit-flex; /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
    display: -moz-flex; /* Firefox 18+ */
    display: -ms-flexbox; /* IE 10 */
    display: flex; /* Chrome 29+, Firefox 22+, IE 11+, Opera 12.1/17/18, Android 4.4+ */
    justify-content: center;
    font-size: calc(35px + (100vw - 1920px) / 100);
}
.bodytitle .lines{
    width: 40.63%;
    height: 2px;
    background: #c1c1c1;
}
.bodytitle .titles{
    width: calc(215px + (100vw - 1920px) / 80);
    text-align: center;
    line-height: 3px;
    color:#888 ;
    font-family: "宋体";
}
.projectcontent{
    width: calc(1280px + (100vw - 1920px) / 2);
    margin: auto;
    display: -webkit-box; /* Chrome 4+, Safari 3.1, iOS Safari 3.2+ */
    display: -moz-box; /* Firefox 17- */
    display: -webkit-flex; /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
    display: -moz-flex; /* Firefox 18+ */
    display: -ms-flexbox; /* IE 10 */
    display: flex; /* Chrome 29+, Firefox 22+, IE 11+, Opera 12.1/17/18, Android 4.4+ */
    justify-content: space-around;
    -ms-flex-pack: distribute;
    flex-wrap: wrap;
   -ms-flex-wrap: wrap;
}
.projectone{
    width: calc(610px + (100vw - 1920px) / 4);
    height: calc(350px + (100vw - 1920px) / 7);
    cursor: pointer;
}
.projectimg{
    width: calc(610px + (100vw - 1920px) / 4);
    height: calc(230px + (100vw - 1920px) / 10);
    overflow: hidden;
}
.projectimg img{
    width: 100%;
}
.projecttitle{
    width: calc(610px + (100vw - 1920px) / 4);
    height: calc(100px + (100vw - 1920px) / 30);
    line-height: calc(100px + (100vw - 1920px) / 30);
    font-size: calc(25px + (100vw - 1920px) / 150);
}
@media screen and (max-width: 768px) {
    .bodytitle {
        margin: 40px auto
    }

    .bodytitle .titles {
        width: 65%;
    }

    .projectcontent {
        width: 100%;
        margin: auto;
        display: -webkit-box; /* Chrome 4+, Safari 3.1, iOS Safari 3.2+ */
        display: -moz-box; /* Firefox 17- */
        display: -webkit-flex; /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
        display: -moz-flex; /* Firefox 18+ */
        display: -ms-flexbox; /* IE 10 */
        display: flex; /* Chrome 29+, Firefox 22+, IE 11+, Opera 12.1/17/18, Android 4.4+ */
        -ms-flex-pack: distribute;
        justify-content: space-around;
        flex-wrap: wrap;
    }
    .projectone {
        width: calc(735px + (100vw - 1920px) / 4);
        height: calc(410px + (100vw - 1920px) / 7);
    }
    .projectimg {
        width: calc(735px + (100vw - 1920px) / 4);
        height: calc(286px + (100vw - 1920px) / 10);
        overflow: hidden;
    }
    .projecttitle {
        width: calc(735px + (100vw - 1920px) / 4);
        height: calc(100px + (100vw - 1920px) / 30);
        line-height: 55px;
        font-size: 17px;
        text-align: center;
    }
}