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

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

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

.sutong-history .box {
  margin: 70px 0 0;
  padding: 36px 65px;
  display: flex;
  background: var(--color-primary) !important;
}

.sutong-history .tab {
  width: 389px
}

.sutong-history .tab ul li {
  line-height: 109px;
  border-bottom: 2px solid rgba(255, 255, 255, .5);
  padding: 0 0 0 44px;
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  text-shadow: #fff 1px 0 0, #fff 0 1px 0, #fff -1px 0 0, #fff 0 -1px 0
}

.sutong-history .tab ul li:hover,
.sutong-history .tab ul li.active {
  text-shadow: none;
  color: #fff
}

.sutong-history .content {
  flex: 1;
  margin-left: 80px
}

.sutong-history .item {
  font-size: 16px;
  line-height: 36px;
  color: #fff;
  display: none
}

.sutong-history .item p~p {
  margin-top: 35px
}


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

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

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

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

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

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

  .sutong-history .box {
    padding: 30px 50px
  }

  .sutong-history .tab ul li {
    padding: 0 0 0 35px;
    font-size: 34px
  }

  .sutong-history .content {
    margin-left: 70px
  }

  .sutong-history .item {
    line-height: 32px
  }

  .sutong-history .item p~p {
    margin-top: 25px
  }
}

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

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

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

  .sutong-history .box {
    padding: 30px
  }

  .sutong-history .tab {
    width: 350px
  }

  .sutong-history .tab ul li {
    padding: 0 0 0 25px;
    font-size: 32px
  }

  .sutong-history .content {
    margin-left: 60px
  }
}

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

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

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

  .sutong-history .box {
    background-size: cover;
    margin: 60px 0 0
  }
}


@media screen and (max-width: 768px) {
  .sutong-history h3::before {
    font-size: 50px
  }


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

  .sutong-history {
    padding: 50px 0 10px
  }

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

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

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

  .sutong-history .box {
    margin: 35px 0 0;
    display: block;
    padding: 25px 20px
  }

  .sutong-history .tab {
    width: 100%
  }

  .sutong-history .tab ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    text-align: center
  }

  .sutong-history .tab ul li {
    padding: 0;
    font-size: 28px;
    width: 50%;
    border-bottom: none;
    line-height: 50px
  }

  .sutong-history .tab ul li:last-child {
    width: 100%
  }

  .sutong-history .content {
    margin: 30px 0 0
  }

  .sutong-history .item {
    line-height: 28px
  }

  .sutong-history .item p~p {
    margin-top: 15px
  }
}

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

  .sutong-history h3::before {
    font-size: 30px
  }
  .sutong-history{
    padding-top: 20px !important;
  }
  .sutong-history h3{
    font-size: 24px !important;
  }
  .sutong-history .tab ul li {
        font-size: 12px;
        width: 33% !important;
        line-height: 20px;
    }
        .sutong-history .item {
        line-height: 22px;
        font-size: 12px;
    }
}