main {
  margin-top: 5.75rem;
}
main .banner {
  height: 31rem;
  position: relative;
}
main .banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
main .banner span {
  color: #fff;
  font-weight: bold;
  position: absolute;
  left: 78%;
}
main .banner .sp1 {
  top: 39%;
  font-size: 2.75rem;
}
main .banner .sp2 {
  top: 53%;
  font-size: 2rem;
}
main .nav {
  padding: 1% 5%;
  display: flex;
  align-items: center;
  background: url("/imgs/nvabg.png") no-repeat;
}
main .nav img {
  width: 1.25rem;
  margin-right: 0.81rem;
}
main .nav a {
  font-size: 0.88rem;
  color: #999;
}
main .nav span {
  font-size: 0.88rem;
  color: #5fa7ff;
}
main .about {
  background: url("/imgs/aboutbg.png") no-repeat;
  padding: 3% 0 0 0;
}
main .about .top {
  padding: 0 6% 0 4%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
main .about .top .tleft {
  width: 50%;
  display: flex;
}
main .about .top .tleft .img1 {
  margin-right: 2.69rem;
  margin-left: 1%;
  width: 1rem;
  height: 4.25rem;
}
main .about .top .tleft .tlrt {
  display: flex;
  flex-direction: column;
}
main .about .top .tleft .tlrt .sp1 {
  line-height: 0.5;
  margin-left: -2.6rem;
  color: #768290;
  font-size: 4.63rem;
}
main .about .top .tleft .tlrt .sp2 {
  font-weight: bold;
  margin-bottom: 1.75rem;
  color: #5fa7ff;
  font-size: 1.63rem;
}
main .about .top .tleft .tlrt .sp3 {
  line-height: 2;
  font-size: 1.25rem;
  color: #333333;
}
main .about .top .tright {
  width: 43.3%;
}
main .about .top .tright img {
  width: 100%;
}
main .about .bottom {
  padding: 0 6% 0 4%;
  display: flex;
  justify-content: space-between;
}
main .about .bottom .bleft {
  width: 38.7%;
}
main .about .bottom .bleft img {
  width: 100%;
}
main .about .bottom .bright {
  margin-top: 5rem;
  width: 43.3%;
  display: flex;
  flex-direction: column;
  color: #333333;
}
main .about .bottom .bright .sp1 {
  font-size: 1.38rem;
  margin-bottom: 1.44rem;
}
main .about .bottom .bright .sp2 {
  font-size: 1.38rem;
  font-weight: bold;
  position: relative;
  margin-bottom: 2.44rem;
}
main .about .bottom .bright .sp2::after {
  position: absolute;
  content: "";
  bottom: -18px;
  left: 0;
  width: 1.63rem;
  height: 3px;
  background-color: #5fa7ff;
}
main .about .bottom .bright p {
  font-size: 1rem;
  color: #666666;
  line-height: 2;
}
main .about .ys {
  display: flex;
  justify-content: space-between;
  background: url("/imgs/ysbg.png");
  padding: 6.56rem 6% 6.56rem 4%;
}
main .about .ys .div1 {
  display: flex;
  align-items: center;
}
main .about .ys .div1 img {
  width: 4.75rem;
  height: 4.75rem;
  margin-right: 1.88rem;
}
main .about .ys .div1 .text {
  display: flex;
  flex-direction: column;
}
main .about .ys .div1 .text .sp1 {
  font-weight: bold;
  position: relative;
  font-size: 2.13rem;
  margin-bottom: 1.5rem;
}
main .about .ys .div1 .text .sp1::after {
  position: absolute;
  content: "";
  width: 12px;
  height: 3px;
  background-color: #bfbfbf;
  bottom: -7px;
  left: 0;
}
main .about .ys .div1 .text .sp2 {
  font-size: 1rem;
  color: #999;
}
/* 窗口宽度<960,设计宽度=768 */
@media screen and (max-width: 959px) {
  main {
    margin-top: 0;
  }
  main .banner {
    height: 300px;
  }
  main .banner .sp1 {
    font-size: 20px;
  }
  main .banner .sp2 {
    font-size: 16px;
  }
  main .nav a {
    font-size: 14px;
  }
  main .nav span {
    font-size: 14px;
  }
  main .about .top {
    flex-direction: column;
    padding: 5%;
  }
  main .about .top .tleft {
    width: 100%;
  }
  main .about .top .tleft img {
    margin-left: 0;
  }
  main .about .top .tleft .tlrt .sp2 {
    font-size: 20px;
  }
  main .about .top .tleft .tlrt .sp3 {
    font-size: 16px;
  }
  main .about .top .tright {
    width: 100%;
  }
  main .about .bottom {
    padding: 0 5% 5% 5%;
    flex-direction: column;
  }
  main .about .bottom .bleft {
    display: none;
  }
  main .about .bottom .bright {
    margin-top: 0;
    width: 100%;
  }
  main .about .bottom .bright .sp1,
  main .about .bottom .bright .sp2 {
    font-size: 18px;
  }
  main .about .bottom .bright .sp1 {
    margin-bottom: 10px;
  }
  main .about .bottom .bright p {
    font-size: 16px;
  }
  main .about .ys {
    flex-wrap: wrap;
    padding: 0 5% 5% 5%;
  }
  main .about .ys .div1 {
    padding: 10px 0;
    width: 50%;
    flex-direction: column;
  }
  main .about .ys .div1 img {
    margin-right: 0;
  }
  main .about .ys .div1 .text .sp1 {
    margin-top: 10px;
    margin-bottom: 10px;
    text-align: center;
    font-size: 18px;
  }
  main .about .ys .div1 .text .sp1::after {
    display: none;
  }
  main .about .ys .div1 .text .sp2 {
    font-size: 14px;
  }
}
<!--耗时1794253741.2239秒-->