body {
    line-height: normal;
}

.container {
    position: relative;
    width: 1200px;
    height: 100%;
    padding: 0;
    left: 50%;
    transform: translateX(-50%);
}

.banner {
    width: 100%;
    height: 480px;
    position: relative;
}

.banner-img {
    width: 100%;
    height: 636px;
    position: absolute;
    left: 0;
    top: 0;
    object-fit: cover;
}

.banner-cont {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #071928;
    text-align: start;
}

.banner-title {
    font-size: 40px;
    font-weight: 500;
}

.banner-slogan {
    margin-top: 10px;
    width: 750px;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.mark {
    position: relative;
    width: 100%;
    height: 165px;
    background: linear-gradient(to bottom, rgba(256,256,256,0), rgba(256,256,256,0.8), rgba(256,256,256,1));
}

.section {
    position: relative;
    top: -160px;
    padding: 60px 0;
    color: #071928;
}

.content {
    position: relative;
    width: 1200px;
    margin: 0 auto;
}

.left {
    width: 100%;
}

.right {
    border-right: 1px solid rgba(123, 123, 123, 0.3);
    position: absolute;
    right: 0;
    top: 0;
}

.right-nav {
    width: 100%;
    margin: 10px 0;
    text-align: end;
    overflow: hidden;
    cursor: pointer;
}

.right-nav p {
    font-size: 18px;
    font-weight: 400;
    line-height: 30px;
    padding-right: 18px;
}

.nav-active {
    font-size: 24px;
    color: #0086f1;
    border-right: 2px solid #0086f1;
    margin: 10px 0;
}

.left-item {
    margin: 50px 0;
    opacity: 0;
    transition: all 0.3s;
}

.item-title {
    display: inline-block;
    vertical-align: top;
    width: 20.5%;
    font-size: 60px;
    font-weight: 500;
    font-style: italic;
    color: #36424D;
    text-align: start;
}

.item-text {
    display: inline-block;
    vertical-align: top;
    width: 79.5%;
    text-align: start;
    font-size: 14px;
    font-weight: 400;
    line-height: 36px;
    overflow: hidden;
}

.item-text p {
    opacity: 0;
    transition: all 1s ease;
}
.left-item:nth-of-type(2){
    opacity: 1;
}
.left-item:nth-of-type(2) .item-text p{
    opacity: 1;
}