body {
  margin: 0;
  padding: 0;
}
.banner {
  width: 100%;
}
.banner img {
  width: 100%;
  height: 53.75rem;
}
.navs {
  width: 100%;
  height: 5.0625rem;
  line-height: 5.0625rem;
  background: #E3E3E3;
  padding-left: 22.5rem;
  box-sizing: border-box;
  color: #7A7A7A;
  font-size: 1rem;
}
.switch {
  display: flex;
  margin:0 auto 5rem;
  justify-content: center;
}
.switch .switch1 {
  width: 25rem;
  height: 5.25rem;
  background: #1651B9;
  line-height: 5.25rem;
  text-align: center;
  color: #fff;
  font-size: 1.25rem;
}
.switch .switch1:hover{
  background: #052C73;

}
.switch .active {
  background: #052C73;
}
.bot {
  width: 69.75rem;
  margin: 0 auto 4.25rem;
}
.bot .bot1 {
  margin-bottom: 5rem;
  position: relative;
}
.bot .bot1 .bot1-1 {
  color: #222222;
  font-size: 3rem;
}
.bot .bot1 .bot1-1:hover{
  color: #1651B9;
}
.bot .bot1 .bot1-1 span {
  color: #1651B9;
  margin-right: 2rem;
}
.bot .bot1 .bot1-2 {
  margin-top: 2.5rem;
  font-size: 1.25rem;
  color: #7A7A7A;
  /* text-indent: 2em; */
  line-height: 1.5;
}
.bot .bot1 .bot1-3 .bot1-3-1{
  margin-right: 1.5625rem;
}
.bot .bot1 .bot1-3 {
  margin-top: 2.5rem;
  display: flex;

}
.bot .bot1 .bot1-3 .bot {
  text-align: center;
  margin-top: 1.25rem;
  width: 100%;
  color: #333333;
  display: none;

}
.bot .bot1 .bot1-3 .top{
  width: 21.875rem;
  height: 15.6875rem;
  overflow: hidden;
}
.bot .bot1 .bot1-3 img {
  width:100%;
  height: 100%;
  background: #FFFFFF;
  transition: all .5s;

}
.bot .bot1 .bot1-3 img:hover{
  transform: scale(1.1);
  transition: all .5s;
}
.bot .bot1 .bot1-3 img:nth-child(3) {
  margin-right: 0;
}
.bot .bot1 .bot1-4 {
  position: absolute;
  left: -8rem;
  top: 12.5rem;
  color: #7A7A7A;
  display: none;
}
.bot .bot1 .bot1-4 div {
  margin-bottom: 0.5rem;
  position: relative;
}
.bot .bot1 .bot1-4 .active::after {
  width: 100%;
  height: 2px;
  background: #1651B9;
  color: #1651B9;
  position: absolute;
  bottom: -0.25rem;
  left: 0;
  content: " ";
}
@media (max-width:850px) {
  .banner img {
    position: absolute;
    top: 0;
}
.navs {
  font-size: 16px;
}
.switch .switch1 {
  font-size: 16px;
}
.bot .bot1 .bot1-2 {
  margin-top: 2.5rem;
  font-size: 16px;
  color: #7A7A7A;
}
.bot .bot1 {
  margin-bottom: 2rem;
}
.bot .bot1 .bot1-3 img:hover{
  transform: scale(1);
  transition: all .5s;
}

}
@media (max-width: 600px) {
  .switch .switch1 {
    width: 35rem;
    height: 5.25rem;
    background: #1651B9;
    line-height: 5.25rem;
    text-align: center;
    color: #fff;
    font-size: 1.25rem;
  }
  .switch .active {
    background: #052C73;
  }
  .navs {
    width: 100%;
    height: 7rem;
    line-height: 7rem;
  }
}
@media (max-width: 450px) {
  .navs {
    width: 100%;
    height: 12rem;
    line-height: 12rem;
    background: #E3E3E3;
    padding-left: 5%;
    box-sizing: border-box;
    color: #7A7A7A;
    font-size: 5rem;
  }
  .switch {
    display: flex;
    margin: 5rem auto;
    width: 90%;
    justify-content: center;
    display: none;
  }
  .switch .switch1 {
    width: 33.33%;
    padding: 2.5rem;
    height: 18rem;
    background: #1651B9;
    box-sizing: border-box;
    text-align: center;
    color: #fff;
    font-size: 5rem;
    line-height: 7.5rem;
  }
  .switch .active {
    background: #052C73;
  }
  .bot {
    width: 90%;
    margin: 5rem auto;
  }
  .bot {
    width: 85%;
    margin: 5rem 5% 5rem 10%;
  }
  .bot .bot1 .bot1-1 {
    color: #222222;
    font-size: 18px;
  }
  .bot .bot1 .bot1-2 {
    margin-top: 2.5rem;
    font-size:14px;
    color: #7A7A7A;
  }
  .bot .bot1 .bot1-3 {
    margin-top: 3rem;
    display: flex;
    justify-content: space-around;
  }
  .bot .bot1 .bot1-3-1 {
    width: 45%;
  }
  .bot .bot1 .bot1-3 img {
    width: 100%;
    height: 34.7rem;
    background: #FFFFFF;
    margin-right: 0;
  }
  .bot .bot1 .bot1-3 .bot {
    text-align: center;
    font-size: 4rem;
    margin: 2rem 0;
  }
  .bot .bot1 .bot1-4 {
    position: absolute;
    left: -7rem;
    top: 12.5rem;
    color: #7A7A7A;
    font-size: 4rem;
    display: none;
  }
  .bot .bot1 .bot1-4 div {
    margin-bottom: 1rem;
    position: relative;
  }
  .bot .bot1 {
    margin-bottom: 5rem;
  }
}