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

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

.sutong-history h3::before {
  display: block;
  content: attr(data-txt);
  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, 0.75) 1px 0 0,
    rgba(210, 217, 221, 0.75) 0 1px 0, rgba(210, 217, 221, 0.75) -1px 0 0,
    rgba(210, 217, 221, 0.75) 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;
}

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

.sutong-history .tab ul li {
  line-height: 109px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.5);
  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: 20px;
  line-height: 36px;
  color: #fff;
  display: none;
}

.sutong-history .icon-text {
  display: flex;
  margin-top: 35px;
}

.sutong-history .icon-text img {
  max-width: 30px;
  margin-right: 16px;
  height: 100%;
}

.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;
  }
  .sutong-history .icon-text {
    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;
  }

  .sutong-history .icon-text {
    margin-top: 15px;
  }
}

@media screen and (max-width: 576px) {
  .sutong-history h3::before {
    font-size: 40px;
  }
}