.hidden {
    display: none;
}
.block {
    display: block;
}
.flex {
    display: flex;
}

.page-header .nav li.on {
    font-weight: bold;
    font-size: 20px;
    color: var(--theme-color-2);
}

.J-banner-nav-item .nav-title-wrap img:nth-child(1) {
    display: block;
}
.J-banner-nav-item .nav-title-wrap img:nth-child(2) {
    display: none;
}

.J-banner-nav-item.active .nav-title-wrap img:nth-child(1) {
    display: none;
}
.J-banner-nav-item.active .nav-title-wrap img:nth-child(2) {
    display: block;
}

.aaa {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 147px;
    height: 71px;
}

.nav-top li.J-banner-nav-item.active .nav-title1 {
    color: var(--theme-color-2);
}

.nav-top ul.nav-son .nav-title3 {
    font-size: 10px;
    color: #666;
}
.nav-top ul.nav-son li.J-banner-nav-item.active .nav-title3 {
    color: var(--theme-color-2);
}

.side-nav .btn-primary:hover {
    background-color: var(--theme-color-2);
    color: var(--download-now-color);
}