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

  .down-menus {
    background: #f8f8f8
  }
  
  .down-menus ul {
    display: flex;
    flex-wrap: wrap
  }
  
  .down-menus ul li {
    width: 20%;
    height: 85px;
    line-height: 85px;
    text-align: center;
    font-size: 15px;
    color: #212121;
    position: relative;
    cursor: pointer
  }
  
  .down-menus ul li:not(:last-child)::after {
    content: "";
    position: absolute;
    right: 0;
    top: 29px;
    bottom: 29px;
    background: #97c8d0;
    width: 1px
  }
  
  .down-menus ul li.active {
    background: #52a9b5;
    color: #fff
  }
  
  .down-list {
    margin: 65px 0 0
  }
  
  .down-list h3 {
    font-size: 22px;
    color: #121212;
    font-weight: 600;
    border-bottom: 1px solid #eee;
    padding-bottom: 29px
  }
  
  .down-list h3~h3 {
    margin-top: 50px
  }
  
  .down-list ul {
    margin: 7px -20px 0;
    display: flex;
    flex-wrap: wrap
  }
  
  .down-list ul li {
    width: 25%;
    padding: 15px 20px
  }
  
  .down-list ul li a {
    border-bottom: 2px solid #ddd;
    width: 100%;
    display: block;
    font-size: 15px;
    color: #666;
    height: 60px;
    line-height: 58px;
    padding: 0 60px 0 19px;
    position: relative
  }
  
  .down-list ul li a span {
    width: 100%;
    display: block;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden
  }
  
  .down-list ul li a::before {
    content: "";
    height: 2px;
    background: var(--active-color);
    width: 0;
    position: absolute;
    left: 0;
    bottom: -2px;
    transition: all .5s ease 0s
  }
  
  .down-list ul li a::after {
    content: "";
    background: url(../images/down1.png) no-repeat center;
    width: 48px;
    height: 48px;
    position: absolute;
    right: 0;
    top: 5px
  }
  
  .down-list ul li a:hover {
    color: var(--active-color)
  }
  
  .down-list ul li a:hover::after {
    background-image: url(../images/down2.png)
  }
  
  .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) {
    .main {
        padding-top: 60px;
        padding-bottom: 60px
    }
    .down-list ul {
        margin: 7px -10px 0
    }
  
    .down-list ul li {
        width: 33.33333%;
        padding: 15px 10px
    }
  }

  @media screen and (max-width: 992px) {
    .main {
        padding-top: 50px;
        padding-bottom: 50px
    }
    .down-menus ul li {
        width: 33.33333%;
        height: 60px;
        line-height: 60px
    }
  
    .down-menus ul li:not(:last-child)::after {
        display: none
    }
    .down-menus ul li {
        width: 33.33333%;
        height: 60px;
        line-height: 60px
    }
  
    .down-menus ul li:not(:last-child)::after {
        display: none
    }
  
    .down-list {
        margin: 45px 0 0
    }
  
    .down-list h3 {
        font-size: 21px;
        padding-bottom: 20px
    }
  
    .down-list ul li a {
        height: 55px;
        line-height: 53px;
        padding: 0 60px 0 10px
    }
  }

  @media screen and (max-width: 768px) {
    .main {
        padding-top:35px;
        padding-bottom: 30px
    }
    .down-list {
        margin: 30px 0 0
    }
  
    .down-list h3 {
        font-size: 20px;
        padding-bottom: 15px
    }
  
    .down-list h3~h3 {
        margin-top: 30px
    }
  
    .down-list ul li {
        width: 50%;
        padding: 15px 10px
    }
  
    .down-list ul li a {
        padding: 0 60px 0 0
    }
  
    .down-list ul li a::after {
        width: 40px;
        height: 40px;
        top: 7px;
        background-size: 20px
    }
  }

  @media screen and (max-width: 576px) {
    .down-menus ul li {
        width: 50%;
        height: 40px;
        line-height: 40px
    }
    .down-list ul {
        margin: 7px 0 0
    }
  
    .down-list ul li {
        width: 100%;
        padding: 10px 0
    }
  }