div.document_list_area{
    padding: 15px 5px;
    /* background-color: #F9F9F9; */
}
ul.document_list{
    width: 100%;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    padding-top: 50px;
}
ul.document_list li{
    width: calc((100% - 90px) / 4);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    background-color: #282828;
    transition: .3s;
    position: relative;
}
ul.document_list li:after{
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    background-color: rgba(0, 0, 0, 0.8);
}

ul.document_list li:hover{
    transform: translateY(-1rem);
}
ul.document_list li:hover a.document_link{
    background-color: #fff;
}
ul.document_list li:hover .document_title, 
ul.document_list li:hover .document_summary{
    color:#000;
}
ul.document_list li:hover div.document_result{
    background-color: #000!important;
    color:#fff!important;
}
ul.document_list li:hover a{
    color:#000;
}
ul.document_list li:hover div.document_category{
    color:#D8151B;
}
ul.document_list li:hover div.document_extra_content{
    background-color: rgba(0, 0, 0, 0.03);
}
ul.document_list li:hover div.document_extra_content > div{
    color: #000;
}
ul.document_list li:hover .document_category_icon{
    background-color: #D8151B;
    color: #fff;
}

a.document_link{
    width: 100%;
    padding: 40px;
    display: block;
    position: relative;
    transition: .3s;
    z-index: 3;
    color: #fff;
}
a.document_link:hover, a.document_link:active, a.document_link:focus{
    text-decoration: none;
}
div.document_body_top{
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
}
div.document_category{
    font-size: 20px;
    font-weight: 700;
    color: #d8ff17;
    transition: .3s;
}
span.document_category_icon{
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: #fff;
    border-radius: 50%;
    font-size: 12px;
    color: #000;
    position: absolute;
    top: 30px;
    right: 40px;
    transition: .3s;
}
div.document_title{
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: .3s;
}
div.document_summary{
    font-size: 16px;
    color: #fff;
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 40px;
    transition: .3s;
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}
div.document_extra_content{
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .3s;
}
div.document_ex_a, div.document_ex_b{
    font-size: 16px;
    color: #fff;
    font-weight: 300;
    margin-bottom: 10px;
    transition: .3s;
}
div.document_ex_a span, div.document_ex_b span{
    font-weight: 700;
}
div.document_ex_b{
    border-bottom: 0;
}
.board .iCheck{
    position: absolute;
    left: 5px;
    top: 5px;
    z-index: 10;
}
@media ( max-width: 1200px ) {
    ul.document_list li{
        width: calc(100% / 3 - 20px);
    }
}
@media ( max-width: 900px ) {
    ul.document_list li{
        width: calc(100% / 2 - 15px);
    }
}
@media ( max-width: 768px ) {
    .board_list{
        overflow: auto;
    }
    .board_list td.title{
        white-space: nowrap;
        min-width: auto;
    }
}
@media ( max-width: 650px ) {
    ul.document_list li{
        width: 100%;
    }
}