html {
  margin: 0px;
  font-size: 20px;
  font-family: "PingFang SC", "Microsoft Yahei", "Arial", "Work Sans", sans-serif;
  width: 100%;
}
body {
  margin: 0;
  position: relative;
  top: 0 !important;
  width: 100%;
  overflow-x: hidden;
  overflow-y: scroll;
  background-color: #F9F9F9;
  -webkit-overflow-scrolling: touch;
}
a {
  text-decoration: none;
}
.clearfix:after {
  content: "";
  display: block;
  clear: both;
}
.w {
  margin: 0 auto;
  overflow: hidden;
  position: relative;
  width: 90%;
  max-width: 1200px;
}
header {
  padding-top: 20px;
}
header a img {
  height: 1.8rem;
}
.bg-box {
  padding: 40px 0px 60px;
  width: 100%;
}
.bg-box .img_bg {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  z-index: -1;
}
.bg-box .img_bg img {
  width: 100%;
}
.bg-box .img_bg img.small_img {
  display: none;
}
.bg-box h1 {
  font-size: 2.2rem;
  font-family: SFProDisplay-Medium;
  color: #ffffff;
}
.bg-box .top_banner {
  display: flex;
}
.bg-box .top_banner .left_box {
  flex: 1;
}
.bg-box .top_banner .left_box .sign_btn {
  width: 10rem;
  font-size: 0;
  display: block;
  line-height: 0;
}
.bg-box .top_banner .left_box .sign_btn img {
  width: 100%;
}
.bg-box .top_banner .right_box {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 3;
}
.bg-box .top_banner .right_box img {
  width: 100%;
}
div.download-store a {
  display: inline-block;
  margin-right: 1rem;
}
div.download-store a img {
  width: 10rem;
}
.content {
  background-color: #fff;
  position: relative;
  box-shadow: 0px 13px 17px -8px rgba(0, 0, 0, 0.05);
  border-radius: 8px;
  z-index: 1;
  padding: 4rem 5rem 0;
  box-sizing: border-box;
  top: -6.5rem;
}
.content h2 {
  font-size: 34px;
  font-family: SFProText-Medium;
  font-weight: 500;
  color: #3a3a3a;
  line-height: 40px;
  margin: 0 0 1.5rem;
}
.content ul {
  list-style: none;
  padding: 0;
}
.content ul li {
  float: left;
  width: 40%;
  margin-bottom: 2rem;
}
.content ul li:nth-child(2n) {
  margin-left: 20%;
}
.content ul li img {
  width: 6rem;
}
.content ul li h3 {
  margin: 0;
  font-size: 20px;
  font-family: SFProText-Semibold;
  font-weight: 600;
  color: #3a3a3a;
  line-height: 30px;
}
.content ul li p {
  margin-top: 0;
  font-size: 16px;
  font-family: SFProText-Regular;
  font-weight: 400;
  color: #9b9b9b;
  line-height: 24px;
}
footer {
  font-size: 14px;
  font-family: SFProDisplay-Medium;
  font-weight: 500;
  color: #b5b5b5;
  line-height: 20px;
  text-align: center;
}
@media screen and (max-width: 1200px) {
  html {
    font-size: 18px;
  }
}
@media screen and (max-width: 960px) {
  html {
    font-size: 16px;
  }
  html .bg-box h1 {
    font-size: 2rem;
  }
}
@media screen and (max-width: 800px) {
  html {
    font-size: 14px;
  }
  html .bg-box {
    width: 98%;
    margin: 0 auto;
  }
  html .bg-box .img_bg img.big_img {
    display: none;
  }
  html .bg-box .img_bg img.small_img {
    display: block;
  }
  html .bg-box .top_banner .left_box {
    flex: 0 0 60%;
  }
  html .bg-box .top_banner .right_box {
    text-align: center;
    flex: 0 0 40%;
  }
  html .content {
    padding: 2rem;
    top: -3rem;
  }
  html .content h2 {
    font-size: 1.8rem;
  }
  html .content ul li {
    width: 100%;
    margin-bottom: 0;
  }
  html .content ul li:nth-child(2n) {
    margin-left: 0;
  }
  html .content ul h3 {
    font-size: 18px;
  }
  html .content ul p {
    font-size: 14px;
  }
}
@media screen and (max-width: 600px) {
  html .bg-box .top_banner {
    display: block;
  }
  html .bg-box .top_banner .left_box .download-store {
    display: inline-block;
  }
  html .bg-box .top_banner .left_box p {
    display: inline-block;
  }
  html .bg-box .top_banner .right_box {
    margin-top: 2rem;
  }
  html .bg-box .top_banner .right_box img {
    width: 80%;
  }
}