* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  background: #fff;
  font-family: PingFang-SC-Medium, PingFang-SC;
}

a {
  text-decoration: none;
  color: #333;
}

.layer-vertical {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.layer-vertical-center {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.m-footer {
  margin-bottom: 100px;
}

.block {
  width: 100%;
  background: #fff;
}

.main {
  max-width: 750px;
  margin: 0 auto;
}

.header {
  height: 112px;
  padding: 20px 20px 0 20px;
}

.logo {
  width: 74px;
  height: 74px;
  background-size: 100% 100%;
  border: 0.5px solid #eee;
  border-radius: 16px;
}

.example {
  height: 433px;
  padding: 18px 0 0 0;
}

.description {
  /*height: 259px;*/
  padding: 12px 20px 0 20px;
}

.footer {
  height: 85px;
  position: fixed;
  bottom: 0;
  padding: 6px 15px 0 15px;
  box-sizing: border-box;
  background: #fff;
  border-top: 0.5px solid rgba(0, 0, 0, 0.06);
  /*display: none;*/
}

.brand-box {
  height: 100%;
  /*overflow: hidden;*/
  border-bottom: 0.5px solid rgba(0, 0, 0, 0.06);
  box-sizing: border-box;
}

.brand-box div {
  float: left;
}

.content {
  margin-left: 15px;
  align-items: start;

  font-size: 13px;
  font-weight: 400;
  color: rgba(21, 30, 40, 0.54);
}

.content h3 {
  font-size: 20px;
  font-weight: 600;
  color: #151E28;
}

.content span {
  margin-top: 8px;
}

.example-box {
  height: 100%;
  border-bottom: 0.5px solid rgba(0, 0, 0, 0.06);
  box-sizing: border-box;
  padding: 0 20px 18px 20px;

  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
}

.example-item {
  height: 100%;
  background: #ccc;
  margin-right: 10px;
  display: inline-block;
  border-radius: 8px;
  border: 0.5px solid #eee;
}

.example-item:last-child {
  margin-right: 0;
}

.description-box {
  font-size: 14px;
  font-weight: 400;
  line-height: 24px;
  color: #000;
}

.description-box ul {
  padding-left: 20px;
}

.description-box p {
  margin-bottom: 10px;
}

.look-forward {
  margin-top: 10px;
  font-size: 12px;
  font-weight: 400;
  color: rgba(21, 30, 40, 0.54);
}

.qr-download {
  float: right;
  margin-top: 30px;
  width: 140px;
  color: #fff;
  font-size: 14px;
  text-align: right;
  position: relative;
}

.qr-download span {
  width: 100%;
  height: 28px;
  margin-top:30px;
  border-radius: 8px;
  padding: 10px 20px 10px 20px;
  cursor: pointer;
}

.qr-download:hover img {
  display: block;
}

.qr-download img {
  display: none;
  width: 140px;
  height: 140px;
  position: absolute;
  top: 40px;
  margin-left: 10px;
  padding: 10px;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: 4px;
}

.top-header {
  width: 100%;
  height: 80px;
  background: #000;
  font-size: 24px;
  z-index: 999;
}

.top {
  height: 100%;
  min-width: 800px;
  padding: 0 80px 0 80px;
  position: relative;
  text-align: center;
}

.brand {
  float: left;
  margin-top: 20px;
}

.menu {
  float: right;
  height: 100%;
  line-height: 80px;
}

.menu a {
  color: #fff;
}

.menu li  {
  list-style: none;
  float: left;
  width: 96px;
  height: 100%;
  margin-left: 10px;
  font-size: 22px;
  color: #fff;
  cursor: pointer;
}

.bottom-footer {
  width: 100%;
  background: #f5f5f5;
  margin-top: 40px;
}

.copyright {
  width: 100%;
  font-size: 16px;
  line-height: 60px;
  color: #666;
  text-align: center;
}

.beian, .beian:visited {
  color: #666;
}

.beian:hover {
  color: #0099ff;
}


#mask {
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  position: fixed;
  top: 0;
  z-index: 3;
}

#mask img {
  height: 100vh;
  display: block;
  margin: 0 auto;
}

/* 手机端 */
@media screen and (max-width: 750px) {
  .qr-download {
    display: none;
  }
  .top-header {
    display: none;
  }
  .bottom-footer {
    display: none;
  }
}
/* PC端 */
@media screen and (min-width: 751px) {
  .footer {
    display: none;
  }
  .m-footer {
    margin: 0;
  }
}