.nav_tit {
    text-align: center;
}

.sec-des {
    color: #777;
    line-height: 1.875;
    width: 70%;
    margin-left: auto;
    margin-right: auto;
    margin-top: 12px;
    text-align: center;
}

.sec-des b {
    color: var(--allColor);
    font-weight: bold;
}

.sec1 {
    overflow: hidden;
}

.sec1swp {
    overflow: visible;
    position: relative;
    padding-bottom: 60px;
}

.sec4swp img,
.sec1swp img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.sec1 .sec1swp .swiper-scrollbar {
    bottom: 0;
    width: 100%;
    left: 0;
    height: 1px;
    background-color: #e5e5e5;
    border-radius: 0;
}

.swiper-scrollbar-drag {
    height: 3px;
    top: -1px;
    background-color: var(--allColor);
    border-radius: 0;
}

.sec2-img {
    width: 91.66%;
    margin-left: auto;
    margin-right: auto;
}

.sec2-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}


.sec3 {
    background: url('../img1/inbj.jpg') no-repeat center center/cover;
}

.sec3-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}




.sec4swp .swiper-button-next:after,
.sec4swp .swiper-button-prev:after {
    content: none;
}

.sec4swp .swiper-button-prev {
    left: 0;
    top: 50%;
    width: 13px;
    margin-top: -17px;
    height: 20px;
}

.sec4swp .swiper-button-next {
    right: 0;
    top: 50%;
    width: 13px;
    margin-top: -17px;
    height: 20px;
}

.sec4swp .swiper-button svg{
    transition: all .5s;
    fill:#333333;
}

.sec4swp .swiper-button:hover svg{
    fill: var(--allColor);
}

.sec4swp {
    padding: 0 4.86% 34px;
    position: relative;
}

.sec4swp:before {
    content: '';
    background: url(../img1/inbj2.png) no-repeat center center/contain;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 49px;
}

.sec1-btm {
    -webkit-mask-image: -webkit-linear-gradient(left, transparent, black 20%, black 80%, transparent);
    mask-image: linear-gradient(to right, transparent, black 20%, black 80%, transparent);
}

.sec1 .cnumlist {
    display: flex;
    justify-content: center;
}

.cnumitem {
    flex: 0 0 34%;
}

.cnumitem:nth-child(1) {
    border-right: 1px solid #e5e5e5;
}

.scrollNumber {
    font-weight: bold;
    text-align: center;
    color: var(--allColor);
    line-height: 1;
}

.sec1 .cnumlist .e_text {
    color: #222;
    text-align: center;
    font-weight: bold;
    line-height: 1.5;
    margin-bottom: 10px;
}

@media screen and (max-width:1600px) {
    .sec-des {
        width: 80%;
    }
}

@media screen and (max-width:768px) {
    .sec-des {
        width: 100%;
    }

    .cnumitem {
        flex: 0 0 42%;
    }

    .sec2-img {
        width: 100%;
    }

    .sec1swp {
        padding-bottom: 40px;
    }
}