html, body {
    padding: 0;
    margin: 0;
    font-size: 14px;
    height: 100%;
    width: 100%;
}

img {
    display: inline-block;
    padding: 0;
    margin: 0;
}

.main {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100%;
    margin: 0 auto;
}

.main .header {
    height: 619px;
    width: 100%;
    display: flex;
    justify-content: center;
    background: linear-gradient(to bottom right, #007EFA, #175FF4);
}

.main .header .content {
    width: 1440px;
    height: 100%;
    position: relative;
}

.main .header .content .bg {
    height: 100%;
    display: flex;
    justify-content: center;
}

.main .header .content .bg img {
    height: 100%;
}

.main .header .content .info {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}

.main .header .content .info .box {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.main .header .content .info .box .detail {
    height: 100%;
    width: 637px;
    margin-right: 111px;
    padding-left: 90px;
}

.main .header .content .info .box .detail .logo {
    display: flex;
    align-items: center;
    margin-top: 105px;
}

.main .header .content .info .box .detail .logo img {
    width: 77px;
}

.main .header .content .info .box .detail .logo .txt {
    margin-left: 20px;
    font-family: Arial-BoldMT, Arial;
    font-weight: normal;
    color: #FFFFFF;
    font-size: 40px;
}

.main .header .content .info .box .detail .txt1 {
    margin-top: 52px;
}

.main .header .content .info .box .detail .txt1 img {
    height: 62px;
}

.main .header .content .info .box .detail .txt2 {
    margin-top: 21px;
    font-size: 27px;
    font-family: PingFangSC-Semibold, PingFang SC;
    font-weight: 600;
    color: #FFFFFF;
    line-height: 33px;
    letter-spacing: 2px;
}

.main .header .content .info .box .detail .txt3 {
    margin-top: 9px;
    font-size: 21px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #FFFFFF;
    line-height: 35px;
    letter-spacing: 1px;
}

.main .header .content .info .box .detail .download {
    margin-top: 45px;
}

.main .header .content .info .box .detail .download .btn {
    display: block;
    height: 61px;
    background-image: url("../image/ios_download.png");
    background-repeat: no-repeat;
    background-size: contain;
}

.main .header .content .info .box .detail .download .btn:hover {
    background-image: url("../image/ios_download_press.png");
}

.main .header .content .info .box .video {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    height: 100%;
}

.main .header .content .info .box .video .img {
    height: 511px;
}

.main .header .content .info .box .video .img img {
    height: 100%;
}

.main .container {
    flex: 1;
    display: flex;
    justify-content: center;
}

.main .container .content {
    width: 1440px;
    height: 100%;
    margin: 0 auto;
}

.main .container .content .item-list {
    margin-top: 102px;
}

.main .container .content .item-list .item {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 127px;
}

.main .container .content .item-list .item .split {
    width: 133px;
}

.main .container .content .item-list .item .desc-img {
    width: 484px;
}

.main .container .content .item-list .item .desc .toptxt {
    font-size: 26px;
    font-family: Arial-BoldMT, Arial;
    font-weight: normal;
    color: #047FF5;
    line-height: 45px;
    letter-spacing: 1px;
}

.main .container .content .item-list .item .desc .underline {
    margin-top: 14px;
    width: 81px;
    height: 4px;
    background: #418AFF;
}

.main .container .content .item-list .item .desc .txt1 {
    margin-top: 19px;
    font-size: 35px;
    font-family: Arial-BoldMT, Arial;
    font-weight: normal;
    color: #022967;
    line-height: 45px;
}

.main .container .content .item-list .item .desc .txt2 {
    margin-top: 14px;
    font-size: 24px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #666666;
    line-height: 34px;
}

.main .container .content .bottom-content {
    margin-top: 29px;
    text-align: center;
}

.main .container .content .bottom-content .txt1 {
    font-size: 35px;
    font-family: PingFangSCSemibold-, PingFangSCSemibold;
    font-weight: normal;
    color: #047FF5;
    line-height: 45px;
}

.main .container .content .bottom-content .txt2 {
    margin-top: 24px;
    font-size: 26px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #666666;
    line-height: 34px;
}

.main .container .content .bottom-content .download {
    text-align: center;
}

.main .container .content .bottom-content .download .btn {
    display: inline-block;
    margin-top: 50px;
    width: 204px;
    height: 68px;
    background-image: url("../image/ios_download_2.png");
    background-repeat: no-repeat;
    background-size: contain;
}

.main .container .content .bottom-content .download .btn:hover {
    background-image: url("../image/ios_download_2_press.png");
}

.main .footer {
    height: 324px;
    width: 100%;
    display: flex;
    justify-content: center;
    background: linear-gradient(to bottom right, #007EFA, #175FF4);
    margin-top: 132px;
}

.main .footer .content {
    width: 1440px;
    height: 100%;
    position: relative;
}

.main .footer .content .bg {
    height: 100%;
    display: flex;
    justify-content: center;
}

.main .footer .content .bg img {
    height: 100%;
}

.main .footer .content .info {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}

.main .footer .content .info .box {
    text-align: center;
    height: 100%;
}

.main .footer .content .info .box .item-list {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 83px;
}

.main .footer .content .info .box .item-list .split {
    width: 436px;
}

.main .footer .content .info .box .item-list .item {
    text-align: left;
}

.main .footer .content .info .box .item-list .item .title {
    font-size: 18px;
    font-family: PingFangSCSemibold-, PingFangSCSemibold;
    font-weight: normal;
    color: #FFFFFF;
    line-height: 15px;
    letter-spacing: 1px;
    margin-bottom: 11px;
}

.main .footer .content .info .box .item-list .item .link a {
    font-size: 14px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #FFFFFF;
    line-height: 36px;
    text-decoration: none;
}

.main .footer .content .info .box .copyright {
    font-size: 15px;
    font-family: AlibabaPuHuiTiR;
    color: #FFFFFF;
    line-height: 15px;
    letter-spacing: 1px;
    margin-top: 61px;
}

@media only screen and (max-width: 1440px) {
    .main .header {
        height: 400px;
    }

    .main .header .content {
        width: 1200px;
    }

    .main .container .content {
        width: 1200px;
    }

    .main .header .content .info .box .detail {
        width: 400px;
    }

    .main .header .content .info .box .detail .logo {
        margin-top: 70px;
    }

    .main .header .content .info .box .detail .logo img {
        width: 52px;
    }

    .main .header .content .info .box .detail .logo .txt {
        font-size: 26px;
    }

    .main .header .content .info .box .detail .txt1 {
        margin-top: 22px;
    }

    .main .header .content .info .box .detail .txt1 img {
        height: 42px;
    }

    .main .header .content .info .box .detail .txt2 {
        margin-top: 2px;
        font-size: 16px;
    }

    .main .header .content .info .box .detail .txt3 {
        font-size: 15px;
        line-height: 16px;
    }

    .main .header .content .info .box .detail .download {
        margin-top: 30px;
    }

    .main .header .content .info .box .detail .download .btn {
        height: 41px;
    }

    .main .header .content .info .box .video .img {
        height: 330px;
    }

    .main .container .content .item-list {
        margin-top: 70px;
    }

    .main .container .content .item-list .item {
        margin-bottom: 80px;
    }

    .main .container .content .item-list .item .desc-img {
        width: 327px;
    }

    .main .container .content .item-list .item .split {
        width: 90px;
    }

    .main .container .content .item-list .item .desc .toptxt {
        font-size: 20px;
        line-height: 20px;
        letter-spacing: 1px;
    }

    .main .container .content .item-list .item .desc .underline {
        margin-top: 14px;
        width: 54px;
        height: 2px;
    }

    .main .container .content .item-list .item .desc .txt1 {
        margin-top: 17px;
        font-size: 27px;
        line-height: 30px;
    }

    .main .container .content .item-list .item .desc .txt2 {
        margin-top: 12px;
        font-size: 17px;
        line-height: 20px;
    }

    .main .container .content .bottom-content {
        margin-top: 20px;
    }

    .main .container .content .bottom-content .txt1 {
        font-size: 26px;
        line-height: 30px;
    }

    .main .container .content .bottom-content .txt2 {
        margin-top: 16px;
        font-size: 18px;
        line-height: 24px;
    }

    .main .container .content .bottom-content .download .btn {
        margin-top: 40px;
        width: 162px;
        height: 46px;
    }

    .main .footer {
        height: 200px;
        margin-top: 80px;
    }

    .main .footer .content {
        width: 1200px;
    }

    .main .footer .content .info .box .item-list {
        padding-top: 40px;
    }

    .main .footer .content .info .box .item-list .split {
        width: 436px;
    }

    .main .footer .content .info .box .item-list .item .title {
        font-size: 14px;
        line-height: 14px;
        margin-bottom: 11px;
    }

    .main .footer .content .info .box .item-list .item .link a {
        font-size: 12px;
        line-height: 28px;
        text-decoration: none;
    }

    .main .footer .content .info .box .copyright {
        font-size: 13px;
        line-height: 13px;
        margin-top: 30px;
    }
}