* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    /* background: rgba(140, 200, 200, 0.1); */
}
a:hover, a:link, a:visited, a:active{
    text-decoration: none;
}

body {
    overflow-y: auto;
    overflow-x: hidden;
    /* background-color: #fff; */
    color: #232323;
    width: 100%;
    text-align: center;
    font-weight: 400;
    font-size: 12px;
    font-family: MicrosoftYaHei, Helvetica Neue For Number, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Helvetica Neue, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

li {
    list-style: none;
}

img {
    border: none;
    vertical-align: top;
}

a {
    color: inherit;
    text-decoration: none;
    vertical-align: middle;
}

.fl {
    float: left;
}

.fr {
    float: right;
    padding: 0;
}

.clearfix::after {
    clear: both;
    display: block;
    content: "";
}

.hide {
    display: none;
}

.nowrap {
    white-space: nowrap;
}

.introduction {
    position: relative;
    overflow: hidden;
    width: 100%;
    background: #fff;
}

.wrapper {
    margin: auto;
    padding: 0 50px;
    width: 100%;
    height: 100%;
    max-width: 1444px;
    min-width: 860px;
}

.nav {
    position: absolute;
    z-index: 100000;
    width: 100%;
    height: 92px;
    color: #fff;
    line-height: 92px;
}

#nav_fixed {
    position: fixed;
    background: #fff;
    box-shadow: 0 4px 10px 0 rgba(216, 216, 216, 0.50);
}

#nav_fixed .btn_about,
#nav_fixed .btn_contact {
    color: #4285F5;
    text-align: right;
    letter-spacing: 0;
    font-size: 16px;
}

#to_top {
    position: fixed;
    right: 60px;
    bottom: 60px;
    z-index: 10;
    cursor: pointer;
}

#to_top.pin {
    position: absolute;
}

#to_top img {
    width: 100px;
    height: 100px;
}

.btn_about {
    display: inline-block;
    width: 120px;
    height: 44px;
    vertical-align: middle;
}
.btn_contact {
    display: inline-block;
    height: 44px;
}

.btn_about {
    margin-right: 24px;
}

.btn_contact {
    margin-right: 22px;
}

.banner {
    position: relative;
    background: #000;
}

#banner_video {
    width: 100%;
}

.banner_content {
    position: absolute;
    top: 50%;
    width: 526px;
    color: #fff;
    text-align: left;
    transform: translateY(-50%);
}

.banner_content .title {
    color: #FFFFFF;
    letter-spacing: 2px;
    font-weight: bold;
    font-size: 54px;
}

.banner_content .subtitle {
    color: #FFFFFF;
    letter-spacing: 0;
    font-size: 32px;
    line-height: 56px;
    opacity: 0.8;
}

.banner_content .tip {
    color: #FFFFFF;
    letter-spacing: 0;
    font-size: 20px;
}

.banner_content .tip {
    margin-top: 98px;
}

.banner_content .btn-group-download-sm {
    margin-top: 24px;
}

.banner_content .btn-google-download-sm {
    width: 144px;
    height: 42px;
}

.banner_content .btn-ios-download-sm {
    margin-left: 8px;
    width: 150px;
    height: 42px;
}

.line_through {
    position: relative;
}

.line_through::after {
    position: absolute;
    top: 60%;
    left: 0;
    width: 100%;
    height: 8px;
    background: #4285F5;
    content: '';
    transform: translateY(-50%);
}

.row::after {
    clear: both;
    display: block;
    content: "";
}

.row {
    position: relative;
}

.introduction .top_title {
    color: #222222;
    letter-spacing: 0;
    font-size: 50px;
}

.introduction .top_subtitle {
    color: #222222;
    letter-spacing: 0;
    font-size: 32px;
}

.flex_box {
    display: flex;
    width: 100%;
    justify-content: space-between;
    align-items: center;
}

.flex_box .item {
    display: inline-block;
}

.sketchpad {
    position: relative;
    white-space: nowrap;
}

.features {
    display: flex;
    width: 100%;
    justify-content: space-between;
}

.features img {
    width: 160px;
    height: 160px;
}

.features > .item {
    display: inline-block;
    width: 360px;
}

.features .text {
    margin-top: 24px;
    color: #222222;
    text-align: center;
    letter-spacing: 0;
    font-size: 20px;
}

.illustration {
    position: relative;
    display: inline-block;
}

.desc {
    display: inline-block;
    padding: 0 100px;
    width: 100%;
}

.desc.desc_block {
    padding: 0;
    width: 526px;
}

.desc .title {
    margin-bottom: 24px;
    color: #4285F5;
    letter-spacing: 0;
    font-size: 36px;
}

.desc.desc_block .title {
    margin-bottom: 32px;
    text-align: left;
}

.desc ul.content li {
    position: relative;
    padding-left: 20px;
    color: rgba(34, 34, 34, 0.5);
    text-align: left;
    letter-spacing: 0;
    font-size: 26px;
}

.desc ul.content li:not(:last-of-type) {
    margin-bottom: 8px;
}

.desc ul.content li:before {
    position: absolute;
    left: 0;
    color: #4285F5;
    content: '\2022';
}

.review {
    width: 100%;
    min-height: 400px;
    background-image: url("img/pic_pingfen.png");
    background-size: auto 400px;
    background-color: rgb(49,56,77);
}

.review .flex_box {
    min-height: 400px;
    height: 400px;
    justify-content: space-between;
    align-items: center;
}

.review .left {
    min-width: 400px;
    text-align: left;
}

.review .right {
    display: flex;
    max-width: 960px;
    align-items: center;
    right: -240px;
}

.review .right .hide {
    display: none;
}

.review .right .left_btn img,
.review .right .right_btn img {
    width: 37px;
    height: 37px;
    cursor: pointer;
}

.review .rating .star {
    width: 34px;
    height: 32px;
}

.review .question {
    color: #FFFFFF;
    letter-spacing: 0;
    font-weight: bold;
    font-size: 36px;
}

.review .rating_content {
    color: #FFFFFF;
    letter-spacing: 0;
    font-size: 26px;
}

.review .review_content .hide {
    display: none;
}

.review .review_content .avatar img {
    width: 80px;
    height: 80px;
}

.review .review_content .username {
    color: #FFFFFF;
    letter-spacing: 0;
    font-size: 26px;
}

.review .review_content .content {
    color: #FFFFFF;
    text-align: center;
    letter-spacing: 0;
    font-size: 20px;
}

.about .btn-google-download {
    width: 273px;
    height: 80px;
}

.about .btn-ios-download {
    margin-left: 24px;
    width: 286px;
    height: 80px;
}

.about .contact {
    min-width: 550px;
    color: #222222;
    text-align: left;
    letter-spacing: 0;
    font-size: 16px;
}

.about .contact .logo,
.about .contact .content {
    display: inline-block;
    vertical-align: middle;
}

.about .contact .logo {
    margin-right: 18px;
}
.about .contact .logo img{
    width: 48px; height: 48px;
}

.about .icon_group {
    margin-top: 20px;
    margin-left: 60px;
}

.about .icon_group img {
    width: 36px;
    height: 36px;
}

.phone_wrapper .flex_box {
    flex-direction: column;
}



.phone_wrapper .banner_content {
    transform: scale(0.75) translate(-20%, -60%);
}

.phone_wrapper .banner_content .tip {
    margin-top: 20px;
}

.phone_wrapper .review {
    padding: 80px 0;
}

.phone_wrapper .review .right {
    margin-right: 0;
}

.phone_wrapper .phone_hide {
    display: none;
}
.flex_box .item.phone_show,
.phone_show {
    display: none;
}
.phone_wrapper .flex_box .item.phone_show,
.phone_wrapper .phone_show {
    display: inherit;
}
.phone_wrapper .flex_box.phone_reverse{
    flex-direction: column-reverse;
}

.phone_wrapper .flex_box > .item:not(:first-child) {
    margin-top: 60px;
}

.phone_wrapper .review .left{
    width: 100%;
    text-align: center;
}
.phone_wrapper .review .review_content .content{
    margin-top: 20px;
}
.phone_wrapper .about .contact .logo ,
.phone_wrapper .about .contact .content ,
.phone_wrapper .about .contact .icon_group{
    width: 100%;
    text-align: center;
    margin: 0;
}
.phone_wrapper .about .contact .logo{
    margin: 36px 0;
}
.phone_wrapper .about .contact .logo img{
    width: 86px;
    height: 86px;
}
.phone_wrapper .about .contact .content{
    font-size: 28px;
}
.phone_wrapper .about .contact .icon_group{
    margin: 56px 0;
}
.phone_wrapper .about .contact .icon_group img{
    width: 86px;
    height: 86px;
}

.phone_wrapper .about .contact .icon_group img:not(:first-child){
    margin-left: 56px;
}

.phone_wrapper .review .right .left_btn img,
.phone_wrapper .review .right .right_btn img {
    width: 56px;
    height: 56px;
    margin-top: -96px;
}

.row_1{
    padding-top: 140px
}

.row_2{
    margin-top: 162px
}
.row_3{
    margin-top: 255px
}
.row_4{
    margin-top: 313px
}
.row_5{
    margin-top: 133px
}
.row_6{
    margin-top: 281px; margin-bottom: 280px;
 }
.row_7{
    margin-top: 61px; margin-bottom: 130px;
}


.phone_wrapper .row_1{
    padding-top: 140px
}
.phone_wrapper .row_3{
    margin-top: 180px;
}
.phone_wrapper .row_4{
    margin-top: 180px;
}
.phone_wrapper .row_2,
.phone_wrapper .row_5{
    margin-top: 300px;
}
.phone_wrapper .row_6{
    margin-top: 281px; margin-bottom: 280px;
}
.phone_wrapper .row_7{
    margin-top: 61px; margin-bottom: 70px;
}