header {
    height: 684px;
}
.banner {
    height: 100%;
}
.product {
    background: #252A32;
}
/* 介绍 */
.solution-des {
    text-align: center;
    padding-top: 80px;
}

.solution-des .title {
    font-size: 30px;
    margin-bottom: 56px;
    color:#00a4e0;
    font-weight: 800;
}

.solution-des .desc {
    color: #666666;
    font-size: 14px;
    max-width: 1000px;
    margin: 0 auto;
    margin-bottom: 96px;
}

.product .nav-link {
    opacity: 0.3;
}
.tab-pane:first-child .product-item:first-child {
    flex: 0 0 50%;
}
.whole-line {
    flex: 0 0 100%!important;
    max-width: 100%;
}

.product-item {
    overflow: hidden;
}

.product-item img {
    transition: 0.2s;
}

.product-item:hover img {
    transform: scale(1.08);
}
.product .nav-link::before {
    content: '';
    height: 0;
    transition: 0.2s;
} 
.product .nav-link.active::before {
    background-color: #00a4e0;
    left: 0;
    height: 100%;
}
.product .nav-link {
    transition: 0.2s;
}
.product .nav-link.active {
    padding-left: 20px;
}