.ppcb-top-banner {
  height: 600px;
  background: url(./../images/qp_qypx/bg.png)
    no-repeat no-repeat center;
  background-size: cover;
}
.ppcb-top-banner .free-use-btn {
  width: 222px;
  height: 70px;
  line-height: 70px;
  font-size: 20px;
  border-radius: 36px;
  margin-left: 0;
  margin-top: 60px;
}
.index-free-box {
  overflow: hidden;
}
.banner-title {
  /* width: 320px; */
  height: 112px;
  font-size: 80px;
  color: #ffffff;
  line-height: 112px;
  margin-top: 160px;
  font-weight: 600;
  margin-bottom: 30px;
}
.special-banner-info {
  font-size: 20px;
  letter-spacing: 1px;
  color: #FFFFFF;
  margin-bottom: 20px;
}
.banner-info {
  width: 588px;
  height: 33px;
  font-size: 24px;
  color: #ffffff;
  line-height: 33px;
  letter-spacing: 4px;
}
.banner-special {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  font-size: 22px;
  color: #fff;
  margin-top: 25px;
}
.banner-special li {
  display: flex;
  align-items: center;
  margin-right: 35px;
}
.banner-special li img {
  width: 24px;
  height: 23px;
  margin-right: 10px;
}
.ppcb-top-banner .shadow-btn {
  width: 222px;
  height: 70px;
  background: #fff;
  opacity: 0.2;
  border-radius: 36px;
  position: absolute;
  top: 9px;
  left: 10px;
}

.teach-box>li:nth-child(odd) {
  background: #fff;
}
.teach-box>li:nth-child(even) {
  background: #F9FAFF;
}



.teach-one {
  width: 1232px;
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto;
  padding: 56px 0 50px 0;
}
.teach-one img {
  width: 966px;
  height: 634px;
  margin: 0 auto;
}


.teach-five {
  width: 1218px;
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto;
  padding: 70px 0 22px 0;
}
.teach-five li {
  width: 388px;
  height: 200px;
  box-sizing: border-box;
  margin: 0 9px 20px 9px;
  border-radius: 16px;
  text-align: center;
}
.teach-five li:hover {
  box-shadow: 0px 0px 9px 0px rgba(0, 0, 0, 0.13);
}
.teach-five li img {
  width: 56px;
  height: 56px;
  margin: 42px 0 20px 0;
}
.teach-five-title {
  color: #222222;
  font-weight: 500;
  font-size: 28px;
}


.teach-two {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  padding: 60px 0 109px 0;
}
.teach-two .img2 {
  width: 821px;
  height: 588px;
  margin-left: 20px;
}
.teach-two-leftImg {
  width: 730px;
  height: 484px;
}

.teach-three {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  padding: 87px 0 48px 0;
}
.teach-three-leftImg {
  width: 730px;
  height: 588px;
}

.teach-four {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  padding: 60px 0 132px 0;
}
.teach-four-leftImg {
  width: 730px;
  height: 446px;
}

.teach-two-right {
  margin-right: 110px
}
.teach-two-left {
  margin-left: 110px;
}

.teach-two-right-box li{
  display: flex;
  width: 360px;
  height: 106px;
  box-sizing: border-box;
  /* border: 1px solid red; */
  padding: 13px 18px 13px 34px;
}
.teach-two-right-box li img {
  width: 40px;
  height: 40px;
  margin-right: 16px;
}

.teach-two-title {
  color: #222222;
  font-weight: 500;
  font-size: 22px;
}
.teach-two-content {
  margin-top: 10px;
  font-size: 14px;
  color: #777777;
}


.videoBtn {
  width: 186px;
  height: 48px;
  font-size: 16px;
  line-height: 48px;
  border: 1px solid #3097FF;
  border-radius: 24px;
  color: #1890FF;
  text-align: center;
  cursor: pointer;
  margin-top: 30px;
}
.right-video {
  float: right;
}

@media screen and (max-width: 1440px) {
  .ppcb-top-banner {
    height: 450px;
  }
  .ppcb-top-banner .free-use-btn {
    width: 166px;
    height: 52px;
    line-height: 52px;
    font-size: 15px;
    margin-top: 44px;
  }
  .free-use-btn img {
    width: 12px;
    height: 13px;
    margin-top: -2px;
  }
  .banner-title {
    /* width: 240px; */
    height: 84px;
    font-size: 60px;
    color: #ffffff;
    line-height: 84px;
    margin-bottom: 23px;
    font-weight: 600;
    margin-top: 120px;
  }
  .special-banner-info {
    font-size: 14px;
    margin-bottom: 16px;
  }
  .banner-info {
    width: 441px;
    height: 25px;
    font-size: 18px;
    color: #ffffff;
    line-height: 25px;
    letter-spacing: 3px;
  }
  .banner-special {
    font-size: 16px;
    margin-top: 18px;
  }
  .banner-special li {
    margin-right: 25px;
  }
  .banner-special li img {
    width: 18px;
    height: 17px;
    margin-right: 6px;
  }
  .ppcb-top-banner .shadow-btn {
    width: 222px;
    height: 70px;
    background: #fff;
    opacity: 0.2;
    border-radius: 36px;
    position: absolute;
    top: 9px;
    left: 10px;
  }
  .ppcb-top-banner .shadow-btn {
    width: 166px;
    height: 52px;
    line-height: 52px;
    top: 6px;
    left: 7px;
  }

  .videoBtn {
    width: 140px;
    height: 36px;
    font-size: 14px;
    line-height: 36px;
    border-radius: 18px;
    margin-top: 15px;
  }

  .teach-one {
    width: 928px;
    padding: 50px 0 48px 0;
  }
  .teach-one img {
    width: 875px;
    height: 574px;
  }
  
  .teach-five {
    width: 915px;
    padding: 40px 0 28px 0;
  }
  .teach-five li {
    width: 291px;
    height: 150px;
    box-sizing: border-box;
    margin: 0 7px 15px 7px;
    border-radius: 12px;
  }
  .teach-five li:hover {
    box-shadow: 0px 0px 7px 0px rgba(0, 0, 0, 0.13);
  }
  .teach-five li img {
    width: 42px;
    height: 42px;
    margin: 31px 0 16px 0;
  }
  .teach-five-title {
    font-size: 20px;
  }
  
  
  .teach-two {
    width: 900px;
    padding: 44px 0 82px 0;
  }
  .teach-two .img2 {
    width: 558px;
    height: 438px;
  }
  .teach-two-leftImg {
    width: 547px;
    height: 363px;
  }
  
  .teach-three {
    width: 900px;
    padding: 65px 0 37px 0;
  }
  .teach-three-leftImg {
    width: 548px;
    height: 440px;
  }
  
  .teach-four {
    width: 900px;
    padding: 43px 0 99px 0;
  }
  .teach-four-leftImg {
    width: 548px;
    height: 335px;
  }
  
  .teach-two-right {
    margin-right: 37px
  }
  .teach-two-left {
    margin-left: 37px;
  }
  
  .teach-two-right-box li{
    width: 316px;
    height: 90px;
    padding: 10px 19px 10px 19px;
  }
  .teach-two-right-box li img {
    width: 30px;
    height: 30px;
    margin-right: 12px;
  }
  
  .teach-two-title {
    font-size: 20px;
  }
  .teach-two-content {
    margin-top: 2px;
    font-size: 14px;
  }
 
}