.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app .img-inner {
    width: 100%;
    height: 100%;
}

.page-center {
    width: 100%;
    box-sizing: border-box;
}

.index {
    display: block;
}

.index-mobile {
    display: none;
}

.page-title {
    width: 288px;
    height: 80px;
    background: url(../images/title-bg.png) no-repeat 100% 100% / 100% 100%;
    color: #333;

    font-size: 26px;
    margin: 0 auto;
}


.index .page-top {
    height: 530px;
    padding-top: 80px;
    position: relative;
    background-size: cover;
    background-position: center bottom;
}

.index .page-top .top-main {
    width: 700px;
}

.index .page-top .top-main .top-title {
    color: #000000;
    font-size: 40px;
    font-style: normal;
    font-weight: 400;
    line-height: normal;
}

.index .page-top .top-main .top-line {
    width: 56px;
    height: 5px;
    margin: 4px 0 15px 0;
    background-color: #33AAFF;
}

.index .page-top .top-main .top-content {
    color: #656565;
    font-size: 16px;
    line-height: 22px;
    margin-bottom: 30px;
}

.index .page-top .top-main .top-btn {
    width: 125px;
    height: 50px;
    border-radius: 25px 5px 40px 25px;
    background: #3AF;
    line-height: 50px;
    text-align: center;
    font-size: 20px;
    color: #fff;

}

.index .page-top .top-bg {
    height: 348px;
    width: 345px;
    object-fit: cover;
}

.index-mobile .page-top {
    padding-top: 6rem;
    background: url(../images/top-bg.png) no-repeat 0% 100% / 125% 100%;
}

.index-mobile .page-top .top-main .top-title {
    font-size: 1.6rem;
    font-weight: bold;
    font-style: italic;
}

.index-mobile .page-top .top-main .top-line {
    width: 5.6rem;
    height: 0.3rem;
    margin: 0.4rem 0 1rem 0;
    background-color: #33AAFF;
}

.index-mobile .page-top .top-main .top-content {
    color: #656565;
    font-size: 0.8rem;
    line-height: 2.2rem;
}

.index-mobile .page-top .top-bg {
    width: 20rem;
    height: 20rem;
    margin: 0 auto;
}

.swiper-view {
    overflow: hidden;
}


.three .preview {
    margin-top: 70px;
}


@media screen and (min-width: 320px) and (max-width: 767px) {
    .app .page-top {
        flex-direction: column;
        padding: 100px 20px 40px 20px;
    }
    .app .page-top .top-main {
        width: 100%;
    }
    .app .page-top .top-bg {
        width: 200px;
        height: 200px;
    }
    .app .page-top .top-bg .img-inner {
        object-fit: contain;
    }
}