.banner {
  position: relative;
  background-color: #5edde4;
  height: 350px;
  margin-bottom: 78px;
  /* min-width: 900px; */
  overflow: hidden;
}

.banner img {
  height: 100%;
  position: absolute;
  top: 0;
  left: -1000px;
  right: -1000px;
  margin: auto;
}

.index-nav {
  width: 1400px;
  margin: 0 auto;
  margin-bottom: 80px;
  display: flex;
  justify-content: space-between;
}

.index-nav span {
  display: block;
}

.index-nav .item {
  text-align: center;
  /* float: left; */
  width: calc(25% - 16px);
  margin-left: 16px;
  transition: box-shadow 0.3s;
  -webkit-transition: box-shadow 0.3s;
}

.index-nav .item:first-child {
  margin-left: 0;
}

.index-nav .item:hover {
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.index-nav .item:hover .text {
  text-decoration: underline;
  border-color: #eee;
}

.index-nav .top {
  padding: 48px 0 42px;
  color: #fff;
}

.index-nav em {
  display: block;
  font-size: 18px;
  margin-top: 26px;
  line-height: 1;
  font-style: normal;
}

.index-nav .text {
  background-color: #fff;
  font-size: 20px;
  line-height: 58px;
  border: 1px solid #dcdcdc;
  border-top: 0;
  transition: border 0.3s;
  -webkit-transition: border 0.3s;
  padding-left: 16px;
}

/* .index-nav .text:after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 19px;
  background: no-repeat center;
  margin-left: 22px;
  vertical-align: middle;
} */
.index-nav .item1 {
  background-color: #056c7b;
}

.index-nav .item1 .text {
  color: #056c7b;
}


.index-nav .item2 {
  background-color: #35acbd;
}

.index-nav .item2 .text {
  color: #35acbd;
}

.index-nav .item3 {
  background-color: #c98b05;
}

.index-nav .item3 .text {
  color: #c98b05;
}

.index-nav .item4 {
  background-color: #c96305;
}

.index-nav .item4 .text {
  color: #c96305;
}


@media screen and (max-width: 1560px) {
  .index-nav {
    width: 90%;
    margin: 0 auto;
    margin-bottom: 80px;
    display: flex;
    justify-content: space-between;
  }
}

@media screen and (max-width: 1400px) {
  .banner {
    height: 244px;
    margin-bottom: 54px;
  }

  .index-nav {
    margin-bottom: 56px;
  }

  .index-nav .item {
    /* width: 216px; */
    margin-left: 12px;
  }

  .index-nav .top {
    padding: 34px 0 30px;
  }

  .index-nav .top img {
    width: 52px;
  }

  .index-nav em {
    font-size: 16px;
    margin-top: 18px;
  }

  .index-nav .text {
    font-size: 18px;
    padding-left: 10px;
    line-height: 46px;
  }

  .index-nav .text:after {
    margin-left: 16px;
    transform: scale(0.75);
    -webkit-transform: scale(0.75);
  }
}

@media screen and (max-width:1080px) {
  .banner {
    height: 20vw;
    margin-bottom: 54px;
  }

}

@media screen and (max-width:860px) {
  .index-nav {
    margin-bottom: 56px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .index-nav .item {
    text-align: center;
    float: none;
    width: calc(50% - 16px);
    margin-left: 0;
    transition: box-shadow 0.3s;
    margin-bottom: 20px;
    -webkit-transition: box-shadow 0.3s;
  }
}