/*css cho Toc*/
.box-toc {
    border: 1px solid #ddd;
    margin-bottom: 20px;
    padding: 10px;
    background: #ededed;
}

.toc-title {
    font-weight: bold;
    cursor: pointer;
    position: relative;
    padding-right: 20px;
}

.toc-title::before {
    border-left: 2px solid #000;
    border-bottom: 2px solid #000;
    content: '';
    height: 8px;
    position: absolute;
    right: 9px;
    top: 9px;
    transform: rotate(135deg);
    transition: .3s;
    width: 8px;
}

.toc-title.crt::before {
    transform: rotate(-45deg);
    top: 14px;
}

.toc-list {
    list-style: none;
    padding-left: 0;
    margin-top: 10px;
}

.toc-list li {
    margin-bottom: 5px;
}

.toc-list li a {
    text-decoration: none;
    color: #333;
}

.toc-list li a.active {
    font-weight: bold;
    color: #0073aa;
}
.toc-list.hidden {
    display: none;
}
a.toc-h2 {
    font-weight: 700;
}
ul.toc-sublist {
    margin-left: 16px;
    list-style: decimal;
    margin-top: 10px;
    margin-bottom: 10px;
}