body {
  padding: 0;
  margin: 0;
}
a {
  text-decoration: none;
}
.banner {
  width: 100%;
  height: auto;
}
.banner img {
  width: 100%;
  height: 100%;
}
.switch {
  margin: 2rem auto;
  padding: 0 22.5rem;
  box-sizing: border-box;
  flex-wrap: wrap;
  display: flex;
  justify-content: center;
}
.switch a {
  padding: 0.75rem 0.9375rem;
  background: #000000;
  color: #fff;
  font-size: 1rem;
  margin-right: 0.625rem;
}
.switch a:hover {
  background-color:#0070be;
}
.switch .active{
  background-color: #0070be;
}
.main {
  margin: 2rem auto;
  /*padding: 0 22.5rem;*/
  width: 75rem;
  box-sizing: border-box;
  display: flex;
  flex-wrap: wrap;
  /*justify-content: space-between;*/
}
.main .main1 {
  width: 24rem;
  display: block;
  /*border: 1px solid #e9e9e9;*/
  box-sizing: border-box;
  margin-bottom: 2rem;
  margin-right: 1.5rem
}
.main .main1:nth-child(3n){
  margin-right: 0
}
.main .main1 .img {
  width: 24rem;
  height: 18rem;
  overflow: hidden;
}
.main .main1 .img img {
  width: 100%;
  height: 100%;
  transition: all 1s;
  display: block;
  object-fit: cover;
}
.main .main1 .desc {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: #333;
  font-size: 0.875rem;
  padding: 1.5rem 1.25rem 2rem;
  box-sizing: border-box;
}
.main .main1 .tit {
  width: calc(100% - 2.5rem);
  box-sizing: border-box;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  margin: 0 auto 0;
  padding: 1.25rem 0;
  color: #333;
  border-bottom: 1px solid #e9e9e9;
  font-size: 1.375rem;
  font-weight: 600;
}
.main .main1:nth-child(3n) {
  margin-right: 0;
}
.main .main1:hover .img img {
  transform: scale(1.2);
  transition: all 1s;
}
@media (max-width: 900px) {
    .switch a {
        padding: 5px 10px;
        background: #000000;
        color: #fff;
        font-size: 16px;
        margin-right: 10px;
    }
    .main {
        margin: 20px auto;
        width: 90%;
    }

    .main .main1 {
        width: 30%;
        display: block;
        border: 1px solid #e9e9e9;
        box-sizing: border-box;
        margin-bottom: 20px;
        margin-right: 5%;
    }
    .main .main1 .img {
        width: 100%;
        height: auto;
        overflow: hidden;
    }
    .main .main1 .tit {
        padding: 5px 0;
        font-size: 16px;
    }
    .main .main1 .desc {
        font-size: 14px;
    }
}
@media (max-width:600px) {
    .switch {
        margin: 20px auto;
        padding: 0 5%;
    }
    .main .main1 {
        width: 100%;
        display: block;
        border: 1px solid #e9e9e9;
        box-sizing: border-box;
        margin-bottom: 20px;
        margin-right: 0;
    }

}