.doc {
    width: 100%;
    padding: 20px 0;
}

.doc-container {
    max-width: 1200px;
    margin: 0 auto;
}

.doc-main-area {
    width: 100%;
    display: flex;
    align-items: flex-start;
}

.doc-catalog {
    width: 300px;
    box-sizing: border-box;
    border: 1px solid #e1e4e5;
    border-radius: 5px;
    padding: 20px;
    margin-right: 20px;
    font-size: 14px;
    position: sticky;
    top: 80px;
    max-height: 820px;
    overflow-y: auto;
}

.doc-catalog li {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-catalog li.first-catalog {
    font-size: 16px;
}

.doc-catalog li.valid-catalog {
    cursor: pointer;
}

.doc-catalog li.valid-catalog:hover {
    color: #378bf7;
}

.doc-catalog li.current {
    color: #378bf7;
}

.doc-catalog li.first-catalog label {
    margin-right: 6px;
}

.doc-catalog li.second-catalog {
    margin-top: 10px;
    text-indent: 2em;
}

.doc-catalog li.second-catalog label {
    margin-right: 6px;
}

.doc-catalog li.second-catalog + li.first-catalog {
    margin-top: 10px;
}

.doc-content {
    flex: 1;
}

.doc-content > .doc-content-item:not(:nth-child(2)) {
    display: none;
}

.doc-content-item {
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
    border: 1px solid #e1e4e5;
    border-radius: 5px;
    min-height: 700px
}

.doc-content-item h2 {
    font-size: 30px;
    line-height: 55px;
    margin-bottom: 10px;
}

.doc-content-txt {
    border-top: 1px solid #e1e4e5;
    padding-top: 10px;
}

.doc-content-txt h3 {
    font-size: 16px;
    margin-top: 16px;
    font-weight: 600;
}

.doc-content-txt h4 {
    font-size: 14px;
    margin-top: 16px;
    font-weight: 600;
}

.doc-content-txt p {
    text-indent: 2em;
    font-size: 15px;
    line-height: 28px;
    margin-top: 10px;
}

.doc-content-txt img {
    max-width: 700px;
    margin-left: 20px;
    margin-top: 15px;
}

.test {
    display: flex;
}

.table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid black;
}

.table thead {
    background-color: #D0D0D0;
}

.table th {
    border-collapse: collapse;
    border: 1px solid black;
    padding: 5px 20px;
    font-size: 16px;
    vertical-align: middle;
    line-height: 26px;
}

.table td {
    border-collapse: collapse;
    border: 1px solid black;
    padding: 5px 20px;
    font-size: 14px;
    color: #333;
    vertical-align: middle;
    line-height: 26px;
}

.table-div {
    width: 90%;
    border-collapse: collapse;
    border: 1px solid black;
    margin: 0 auto;
}

.table-div thead {
    background-color: #D0D0D0;
}

.table-div th {
    border-collapse: collapse;
    border: 1px solid black;
    padding: 5px;
    font-size: 16px;
    vertical-align: middle;
    text-align: center;
    line-height: 26px;
}

.table-div td {
    border-collapse: collapse;
    border: 1px solid black;
    padding: 5px 20px;
    font-size: 14px;
    color: #333;
    vertical-align: top;
    text-align: center;
    line-height: 26px;
}