.top-0{background: white;}

.download{
    position: relative;
    padding-top: 70px;
}

.download>div {
    width: 1200px;
    margin: 0 auto;
    padding-top: 36px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-direction: column;
    flex-direction: column;
}

.download-title{
    width: 1200px;
    margin: 0 auto;
    font-size: 52px;
    color: #1f2329;
    font-weight: 500;
    line-height: 73px;
    text-align: center;
}
.download-subtitle {
    margin-top: 10px;
    font-size: 22px;
    color: #8f959e;
    line-height: 30px;
    text-align: center;
}

.download-items {
    display: flex;
    align-items: center;
    margin: 40px auto 0;
    width: 852px;
    justify-content: center;
}
.download-items .item-card {
    margin: 0 50px;
}
.download-items .download-item {
    width: 150px;
    position: relative;
    display: flex;
    height: 230px;
    flex-direction: column;
}
.download-items .download-item .download-item-hover {
    position: absolute;
    top: 0;
    left: 5px;
    opacity: 0;
    width: 140px;
    height: 140px;
    display: flex;
    align-items: center;
    cursor: pointer;
    margin: auto;
    transform: scale(0);
    transition: all .2s ease;
}
.download-items .download-item:hover .download-item-hover {
    opacity: 1;
    transform: scale(1);
    transform-origin: center;
}
.download-items .download-item .download-item-mobile {
    cursor: default;
    width: 86px;
    height: 86px;
    transform: scale(.6);
    left: 30px;
    top: 27px;
}
.download-items .download-item .download-item__img {
    width: 140px;
    height: 140px;
    margin: 0 auto;
    flex: none;
    transition: all .2s ease;
}
.download-items .download-item .download-item__text {
    font-size: 16px;
    color: #1f2329;
    line-height: 22px;
    text-align: center;
    margin-top: 50px;
    white-space: pre;
    transition: all .2s ease;
}
.download-items .download-item:hover .download-item__text {
    margin-top: 31px;
}
.download-items .download-item .download-item__click {
    font-size: 12px;
    color: #8f959e;
    line-height: 17px;
    text-align: center;
    opacity: 0;
    bottom: 0;
    width: 100%;
    position: absolute;
    transition: all .2s ease;
}
.download-items .download-item:hover .download-item__click {
    color: #8f959e;
    bottom: 19px;
    opacity: 1;
}

@media screen and (max-width: 768px) {
    .header-block {
    background-color: #fff;
}
.lark-header {
    background:url(../image/chat/chat-head-bg.png) bottom no-repeat;
    background-size: 100% auto;
    width: 100%;
    height: auto;
    padding-bottom: 56vw;
}
.headblock {
    padding-top: 18vw;
        width: 87.2vw;
}
.headblock-title {
    font-size: 6.4vw;
    line-height: 8.53333333vw;
    width: 100%;
}
.headblock-subtitle {
    font-size: 3.73333333vw;
    line-height: 5.33333333vw;
    margin-top: 3.33333333vw;
    width: 100%;
}
.feature {
    width: 87.2vw;
    padding-top: 11.2vw;
    height: auto;
    -ms-flex-direction: column-reverse;
    flex-direction: column-reverse;
}
.feature~.feature {
    padding-top: 0;
    margin-top: 10.66666667vw;
}
.feature-image {
    width: 87.2vw;
}
.rise-up-wrapper {
    opacity: 1;
    -webkit-animation: none;
    animation: none;
}
.feature-intro {
    width: 100%;
    text-align: left;
    padding-left: 0!important;
}
.feature-icon {
    width: 12vw;
    height: 12vw;
}
.feature-title {
    font-size: 5.33333333vw;
    margin-top: 2.66666667vw;
}
.feature-subtitle {
    font-size: 4vw;
    line-height: 6vw;
    margin-top: 2.13333333vw;
    width: auto;
}
.download>div{
    width: 100%;
}
.download-title{
    width: 100%;
}
.download-items{
    width: 100%;
    flex-direction: column;
}
.download-items .item-card{
    width: 100%;
    display: flex;
    justify-content: center;
}
.download-items .download-item{
    align-items: center;
}
}