.top-0{background: white;}
.header-block {
    height: auto;
    width: 100%;
}
.lark-header {
    background: 100% 100% no-repeat;
    background-size: 680px auto;
    width: 1200px;
    margin: 0 auto;
    height: 670px;
    background-image: url(../image/chat/chat-head-bg.png);
}
.headblock {
    width: 1200px;
    margin: 0 auto;
    position: relative;
    padding-top: 188px;
    padding-left: 4px;
}
.headblock-title {
    color: #141f33;
    font-weight: 700;
    font-family: Helvetica Neue,Helvetica,PingFang SC,Microsoft YaHei,Tahoma,Arial;
    font-size: 48px;
    line-height: 64px;
    width: 700px;
    color: #1f2329;
}
.headblock-subtitle {
    color: #646a73;
    font-size: 20px;
    line-height: 30px;
    font-weight: 400;
    margin-top: 8px;
    width: 660px;
    white-space: pre-wrap;
}

.suite-bg {
    background-size: 100% auto;
    background-repeat: no-repeat;
    background-position: 50%;
    background-image: url(../image/chat/section1-bg.svg);
}
.feature-reverse {
    -ms-flex-direction: row-reverse;
    flex-direction: row-reverse;
}
.feature {
    width: 1200px;
    margin: 0 auto;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    -ms-flex-pack: center;
    justify-content: center;
    height: 640px;
    -ms-flex-pack: justify;
    justify-content: space-between;
}

.rise-up-wrapper {
    opacity: 0;
}
.item-rise-up {
    -webkit-animation: rise-up 1.5s forwards;
    animation: rise-up 1.5s forwards;
}
@keyframes rise-up{
    0%{opacity:0;-webkit-transform:translateY(100px);transform:translateY(100px)}to{opacity:1;-webkit-transform:translateY(0);transform:translateY(0)}
}
.feature-image {
    width: 600px;
}
.feature-intro {
    width: 600px;
    padding-left: 80px;
}
.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
}
.feature-title {
    color: #141f33;
    font-weight: 700;
    font-family: Helvetica Neue,Helvetica,PingFang SC,Microsoft YaHei,Tahoma,Arial;
    color: #1f2329;
    font-size: 32px;
    line-height: 48px;
    margin-top: 22px;
}
.feature-subtitle {
    color: #646a73;
    font-size: 18px;
    line-height: 30px;
    margin-top: 8px;
    width: 500px;
}


@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;
}
}