.page-header{
    background-image: url("../images/2-header.jpg");
}
.part1{
    padding-top: 3.1347962382445136vw;
    max-width: 1440px;
    margin: 0 auto;
}
.part2{
    max-width: 1440px;
    margin: 0 auto;
    padding-bottom: 6.243272335844995vw;
}

.line1{
    color: rgb(75, 75, 75);
    text-align: center;
    font-size: 14px;
}

.line2{
    color: rgb(142, 36, 170);
    text-align: center;
    font-size: 36px;
    margin-top: 12px;
}

.pic-ctn{
    margin-left: 21.66100661790317%;
    margin-right: 22.36633577150818%;
    margin-top: 1.044932079414838vw;
}

.pic-ctn img{
    display: block;
    width: 100%;
    height: auto;
}

.project-list{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.project{
    width: calc((100% - 160px) / 3);
    height: 0;
    padding-bottom: calc((100% - 160px) / 3 * 0.8);
    margin-right: 20px;
    margin-left: 20px;
    position: relative;
}

.col4 .project{
    width: calc((100% - 120px) / 4);
    margin-left: 10px;
    margin-right: 10px;
    padding-bottom: calc((100% - 120px) / 4 * 0.8);
}

.project .cover{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 205;
    object-fit: cover;
}

.project .name{
    position: absolute;
    z-index: 225;
    text-align: center;
    left: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    color: #fff;
    line-height: 44px;
    width: 100%;
}

.line3{
    font-size: 24px;
    color: rgb(75, 75, 75);
    text-align: center;
    margin-top: 16px;
}

@media (max-width: 768px) {
    .line2{
        font-size: 16px !important;
    }

    .line3{
        font-size: 14px;
        margin-top: 12px;
    }

    .pic-ctn{
        width: 80%;
        margin-left: auto;
        margin-right: auto;
    }

    .project-list{
        display: block;
    }

    .project,
    .col4 .project{
        width: 90%;
        height: calc(90vw * 0.5625);
        padding-bottom: 0;
        margin-right: auto;
        margin-left: auto;
        display: block;
        margin-bottom: 10px;
    }

    .switch-tabs .tab{
        padding: 8px;
        margin: 0;
        white-space: nowrap;
        flex: 0 0 auto;
        margin-bottom: 4px;
        font-size: 14px;
    }

    .switch-tabs .tab.active{
        font-size: 16px;
    }

    .switch-tabs{
        margin-bottom: 30px;
        flex-wrap: wrap;
        padding-left: 5px;
        padding-right: 5px;
    }

    .switch-tabs .tab::after{
        display: none;
    }
}