.sutong-about3 {
  padding: 100px 0 40px
}

.sutong-about3 h3 {
  font-size: 40px;
  color: #212121;
  font-weight: 700;
  line-height: 1;
  position: relative;
  z-index: 20
}

.sutong-about3 h3::before {
  display: block;
  content: attr(title);
  white-space: nowrap;
  color: #fff;
  position: absolute;
  left: 0;
  top: -38px;
  font-size: 98px;
  line-height: 1;
  z-index: -1;
  text-shadow: rgba(210, 217, 221, .75) 1px 0 0, rgba(210, 217, 221, .75) 0 1px 0, rgba(210, 217, 221, .75) -1px 0 0, rgba(210, 217, 221, .75) 0 -1px 0
}

.sutong-about3 h3::after {
  display: block;
  content: '';
  width: 80px;
  height: 2px;
  background: var(--color-primary);
  margin: 10px auto 0 0
}

.sutong-about3 ul {
  margin: 60px -20px 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap
}

.sutong-about3 ul li {
  width: 33.33333%;
  padding: 0 20px
}

.sutong-about3 ul li .box {
  border: 1px solid #ddd;
  padding: 60px 40px;
  height: 100%
}

.sutong-about3 ul li .box > span {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--color-primary);
  text-align: end;
  border-bottom: 2px solid var(--color-primary);
  border-left: 2px solid var(--color-primary);
  border-top: 2px solid var(--color-primary);
  margin-bottom: 20px;
}

.sutong-about3 ul li .box > span i {
  font-size: 24px;
  line-height: 32px;
}

.sutong-about3 ul li p {
  /* margin: 37px 0 0; */
  line-height: 36px;
  font-size: 17px;
  color: #666;
  line-height: 1.8;
}

.sutong-about3 ul li:hover .box {
  border-color: var(--color-primary)
}

.sutong-about3 dl {
  margin: 80px 0 0;
  display: flex;
  flex-wrap: wrap
}

.sutong-about3 dl dd {
  width: 25%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative
}

.sutong-about3 dl dd::after {
  content: "";
  position: absolute;
  right: 0;
  top: 35px;
  bottom: 35px;
  background: #ccc;
  width: 1px
}

.sutong-about3 dl dd:first-child::before {
  content: "";
  position: absolute;
  left: 0;
  top: 35px;
  bottom: 35px;
  background: #ccc;
  width: 1px
}

@media screen and (max-width: 1441px) {

  .sutong-about3 h3::before {
    font-size: 90px
  }

  .sutong-about3 h3 {
    font-size: 38px
  }
}

@media screen and (max-width: 1367px) {

  .sutong-about3 h3::before {
    font-size: 80px
  }

  .sutong-about3 h3 {
    font-size: 36px
  }

  .sutong-about3 {
    padding: 80px 0 30px
  }

  .sutong-about3 ul li .box {
    padding: 50px 30px
  }

  .sutong-about3 ul li p {
    margin: 30px 0 0;
    line-height: 32px
  }

  .sutong-about3 dl {
    margin: 60px 0 0
  }
}

@media screen and (max-width: 1281px) {

  .sutong-about3 h3::before {
    font-size: 70px
  }

  .sutong-about3 h3 {
    font-size: 34px
  }
}

@media screen and (max-width: 1171px) {

  .sutong-about3 h3::before {
    font-size: 60px
  }

  .sutong-about3 h3 {
    font-size: 32px
  }

  .sutong-about3 ul {
    margin: 50px -10px 0
  }

  .sutong-about3 ul li {
    padding: 0 10px
  }

  .sutong-about3 ul li .box {
    padding: 40px 20px
  }
}

@media screen and (max-width: 992px) {

  .sutong-about3 ul {
    margin: 40px -10px 0;
    justify-content: center
  }

  .sutong-about3 ul li {
    width: 50%;
    padding: 10px
  }

  .sutong-about3 dl {
    margin: 50px 0 0
  }

  .sutong-about3 dl dd:first-child::before,
  .sutong-about3 dl dd::after {
    top: 15px;
    bottom: 15px
  }

  .sutong-about3 dl dd img {
    max-height: 80px
  }
}

@media screen and (max-width: 768px) {

  .sutong-about3 h3::before {
    font-size: 50px
  }
}

@media screen and (max-width: 768px) {

  .sutong-about3 h3 {
    font-size: 30px
  }

  .sutong-about3 {
    padding: 40px 0 10px
  }

  .sutong-about3 h3 {
    text-align: center
  }

  .sutong-about3 h3::before {
    left: 0;
    right: 0;
    text-align: center;
    top: -20px
  }

  .sutong-about3 h3::after {
    margin: 10px auto 0
  }

  .sutong-about3 dl {
    margin: 30px 0 0
  }

  .sutong-about3 ul {
    margin: 24px 0 0
  }

  .sutong-about3 ul li {
    width: 100%;
    padding: 6px 0
  }

  .sutong-about3 ul li .box {
    padding: 20px
  }

  .sutong-about3 ul li p {
    margin: 20px 0 0;
    line-height: 28px
  }
}

@media screen and (max-width: 576px) {

  .sutong-about3 h3::before {
    font-size: 40px
  }

  .sutong-about3 dl {
    margin: 20px 0 0
  }

  .sutong-about3 dl dd {
    width: 50%;
    padding: 10px 0
  }

  .sutong-about3 dl dd:first-child::before,
  .sutong-about3 dl dd::after {
    display: none
  }

  .sutong-about3 dl dd:nth-child(2n+1)::after {
    display: block
  }
}


@media screen and (max-width:480px){
    .sutong-about3 h3::before {
    font-size: 30px
  }
    .sutong-about3 h3 {
    font-size: 24px
  }
      .sutong-about3 ul li .box {
        padding: 10px;
    }
        .sutong-about3 ul li p {
        margin: 5px 0 0;
        line-height: 24px;
        font-size: 12px;
    }
}