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

body {
  max-width: 750px;
  margin: 0 auto;
  -webkit-overflow-scrolling: touch;
  overflow-scrolling: touch;
  overflow-y: scroll;
  font-family: -apple-system, BlinkMacSystemFont, Helvetica Neue, Helvetica, Segoe UI, Arial, Roboto, PingFang SC, miui, Hiragino Sans GB, Microsoft Yahei, sans-serif;
}

.main {
  max-width: 750px;
  min-height: 100vh;
  background-image: url(../img/bg.png);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

.main .desc {
  display: flex;
  padding: 2rem 12% 0rem 12%;
}

.main .logo {
  display: flex;
}

.main .product {
  display: flex;
  margin: 0px 5% 0% 8%;
}

.main img {
  width: 100%
}

.main .btnDiv {
  max-width: 750px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding-left: 2rem;
  padding-right: 2rem;
}

.main .btnDiv img {
  display: flex;
  cursor: pointer;
  width: 50%
}

.teach {
  max-width: 750px;
  min-height: 100vh;
  background-image: url(../img/bg.png);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

.teach-header {
  display: flex;
  height: 46px;
  justify-content: space-between;
}

.back-icon {
  width: 1.5rem !important;
  margin-right: 0.6rem;
  margin-left: 0.6rem;
}

.footer-item img {
  display: flex;
  width: 20%
}

.head-back {
  display: flex;
  width: 50%;
  align-items: center;
  justify-content: flex-start;
}

.head-icon {
  justify-content: flex-end;
  align-items: center;
  display: flex;
}

.ab-icon {
  width: 3.75rem !important;
  margin-right: 1rem;
}

.teach-body {
  max-width: 750px;
  min-height: 500px;
  align-items: center;
  display: flex;
  margin-top: 10px;
}

.teach-footer {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: space-evenly;
  padding-left: 1rem;
  padding-right: 1rem;
  margin-top: 20px;
}

.teach-footer button {
  width: 105px;
  height: 30px;
  border-radius: 45px;
  background: linear-gradient(180deg, rgba(173, 143, 255, 0.9) 0%, rgba(136, 99, 240, 0.9) 47.92%);
  box-shadow: 0px 5px 4px 0px #00000040;
  font-size: 16px;
  border: none;
  color: #FFFFFF;
}

.teach-footer.teach-footer1 button {
  width: 120px;
}

.teach-footer img {
  display: flex;
  width: 30%;
  cursor: pointer;
}

.teach-video {
  max-width: 750px;
  width: 70%;
  background-image: url(../img/phone.png);
  background-repeat: no-repeat;
  background-position-x: center;
  background-position-y: center;
  background-size: 100% 90%;
  margin: auto;
  display: flex;
  align-items: center;
}

.video-parent {
  width: 65%;
  background-image: url(../img/video-bg.png);
  background-repeat: no-repeat;
  background-position-x: center;
  background-position-y: center;
  background-size: 100% 100%;
  margin: auto;
  display: flex;
  align-items: center;
  padding: 10px 0;
}

.video {
  width: 94%;
  min-height: 400px;
  border-radius: 20px;
  margin: auto;
  display: flex;
}

.hide {
  display: none;
}

@media screen and (min-width: 750px) {
  .teach-video {
    width: 51%;
  }

  /* .video {
    width: 46%;
  } */

  .teach-header {
    padding-top: 20px;
    font-size: 30px;
  }

  .teach-footer {
    margin-top: 10px;
  }

  .ab-icon {
    width: 8rem !important;
  }

  .back-icon {
    width: 4.5rem !important;
    margin-right: 1rem;
    margin-left: 1rem;
  }
}


@media screen and (min-width: 390px) and (max-width: 749px) {
  /* .video {
    width: 70%;
  } */

  .teach-body {
    margin-top: 20px;
  }

  .teach-footer {
    margin-top: 20px;
  }
}

.btn {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  font-size: 1rem;
  width: 6.5rem;
  margin-bottom: 1rem;
  height: 2.5rem;
  flex-shrink: 0;
  border-radius: 45px;
  background: linear-gradient(180deg, rgba(173, 143, 255, 0.50) 0%, rgba(136, 99, 240, 0.50) 47.92%);
  box-shadow: 0px 5px 4px 0px rgba(0, 0, 0, 0.25);
}

.btnClick {
  background: linear-gradient(180deg, rgba(173, 143, 255, 0.90) 0%, rgba(136, 99, 240, 0.90) 47.92%);
}