div.document_list_area{
    padding: 15px 10px;
    /* background-color: #F9F9F9; */
}
ul.document_list{
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
ul.document_list li{
    width: calc(100% / 4 - 15px);
    padding: 30px;
    border-radius: 16px;
    background-color: #fff;
    box-shadow: 0 4px 12px 0 rgba(0, 0, 0, 0.25);
    transition: .3s;
    color: #000;
}
ul.document_list li:hover{
    transform: translateY(-10px);
    background-color: #1B263B;
    color: #fff;
    box-shadow: none;
}
ul.document_list li:hover a{
    color:#fff;
}
a.document_link{
    display: block;
    text-decoration: none;
}
a.document_link:hover, a.document_link:active, a.document_link:focus{
    text-decoration: none;
}
div.document_title{
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 1rem;
}
div.document_summary{
    font-size: 14px;
    font-weight: 400;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.6;
}
div.document_result{
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 1.5rem;
}
@media ( max-width: 1200px ) {
    ul.document_list li{
        width: calc(100% / 3 - 15px);
    }
}
@media ( max-width: 900px ) {
    ul.document_list li{
        width: calc(100% / 2 - 10px);
    }
}
@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%;
    }
}