.sutong-download.main {
  padding-top: 100px;
  padding-bottom: 100px
}

.sutong-download .down-menus {
  background: #f8f8f8
}

.sutong-download .down-menus ul {
  display: flex;
  flex-wrap: wrap
}

.sutong-download .down-menus ul li {
  width: 20%;
  height: 85px;
  line-height: 85px;
  text-align: center;
  font-size: 15px;
  color: var(--title-text-color);
  position: relative;
  cursor: pointer
}

.sutong-download .down-menus ul li:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 29px;
  bottom: 29px;
  background: #97c8d0;
  width: 1px
}

.sutong-download .down-menus ul li.active {
  background: var(--color-primary);
  color: #fff
}

.sutong-download .down-list {
  margin: 65px 0 0
}

.sutong-download .down-list h3 {
  font-size: 22px;
  font-weight: 600;
  border-bottom: 1px solid #eee;
  padding-bottom: 29px
}

.sutong-download .down-list h3~h3 {
  margin-top: 50px
}

.sutong-download .down-list ul {
  margin: 7px -20px 0;
  display: flex;
  flex-wrap: wrap
}

.sutong-download .down-list ul li {
  width: 25%;
  padding: 15px 20px
}

.sutong-download .down-list ul li a {
  border-bottom: 2px solid #ddd;
  width: 100%;
  display: block;
  font-size: 15px;
  color: var(--text-color);
  height: 60px;
  line-height: 58px;
  padding: 0 60px 0 19px;
  position: relative
}

.sutong-download .down-list ul li a span {
  width: 100%;
  display: block;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden
}

.sutong-download .down-list ul li a::before {
  content: "";
  height: 2px;
  background: var(--color-primary);
  width: 0;
  position: absolute;
  left: 0;
  bottom: -2px;
  transition: all .5s ease 0s
}

.sutong-download .down-list ul li a i {
  position: absolute;
  right: 8px;
  top: 4px
}

.sutong-download .down-list ul li a:hover {
  color: var(--color-primary)
}

.sutong-download .down-list ul li a:hover::after {
  background-image: url(../images/down2.png)
}

.sutong-download .down-list ul li a:hover::before {
  width: 100%
}

@media screen and (max-width: 1441px) {
  .main {
    padding-top: 80px;
    padding-bottom: 80px
  }
}

@media screen and (max-width: 1367px) {
  .main {
    padding-top: 70px;
    padding-bottom: 70px
  }
}

@media screen and (max-width: 1281px) {
  .sutong-download.main {
    padding-top: 60px;
    padding-bottom: 60px
  }

  .sutong-download .down-list ul {
    margin: 7px -10px 0
  }

  .sutong-download .down-list ul li {
    width: 33.33333%;
    padding: 15px 10px
  }
}

@media screen and (max-width: 992px) {
  .sutong-download.main {
    padding-top: 50px;
    padding-bottom: 50px
  }

  .sutong-download .down-menus ul li {
    width: 33.33333%;
    height: 60px;
    line-height: 60px
  }

  .sutong-download .down-menus ul li:not(:last-child)::after {
    display: none
  }

  .sutong-download .down-menus ul li {
    width: 33.33333%;
    height: 60px;
    line-height: 60px
  }

  .sutong-download .down-menus ul li:not(:last-child)::after {
    display: none
  }

  .sutong-download .down-list {
    margin: 45px 0 0
  }

  .sutong-download .down-list h3 {
    font-size: 21px;
    padding-bottom: 20px
  }

  .sutong-download .down-list ul li a {
    height: 55px;
    line-height: 53px;
    padding: 0 60px 0 10px
  }
}

@media screen and (max-width: 768px) {
  .sutong-download.main {
    padding-top: 35px;
    padding-bottom: 30px
  }

  .sutong-download .down-list {
    margin: 30px 0 0
  }

  .sutong-download .down-list h3 {
    font-size: 20px;
    padding-bottom: 15px
  }

  .sutong-download .down-list h3~h3 {
    margin-top: 30px
  }

  .sutong-download .down-list ul li {
    width: 50%;
    padding: 15px 10px
  }

  .sutong-download .down-list ul li a {
    padding: 0 60px 0 0
  }

  .sutong-download .down-list ul li a::after {
    width: 40px;
    height: 40px;
    top: 7px;
    background-size: 20px
  }
}

@media screen and (max-width: 576px) {
  .sutong-download .down-menus ul li {
    width: 50%;
    height: 40px;
    line-height: 40px
  }

  .sutong-download .down-list ul {
    margin: 7px 0 0
  }

  .sutong-download .down-list ul li {
    width: 100%;
    padding: 10px 0
  }
}