.topic_wrap {
  padding-top: 17px;
  padding-bottom: 17px;
}

.topic_left {
  width: 207px;
  background-color: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 4px 0 #ddd;
}

.topic_left li {
  border-bottom: 1px solid #eee;
  padding-bottom: 20px;
  margin-bottom: 17px;
  padding-left: 40px;
  position: relative;
}

.topic_left li:last-child {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

.topic_left i {
  position: absolute;
  width: 20px;
  height: 20px;
  background-size: 100% 100%;
  background-repeat: no-repeat;
  top: -1px;
  left: 0;
}

.topic_left h3 {
  font-size: 16px;
  font-weight: bold;
}

.topic_left h3 a {
  color: #333;
}

.topic_left .sub {
  margin-top: 15px;
}

.topic_left p {
  line-height: 28px;
  font-size: 14px;
}

.topic_right {
  width: 1050px;
  padding: 30px;
  background-color: #fff;
  box-shadow: 0 0 4px 0 #ddd;
  border-radius: 5px;
}

.topic_right .title {
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 15px;
}

.topic_right_item li {
  width: 320px;
  height: 220px;
  margin-right: 15px;
  border: 1px solid #ddd;
  padding: 20px;
  margin-bottom: 20px;
}

.topic_right li:nth-child(3n) {
  margin-right: 0;
}

.topic_right dl {
  margin-bottom: 20px;
}

.topic_right dt {
  width: 80px;
  height: 80px;
  background-color: #f4f4f4;
  margin-right: 20px;
}
.topic_right img {
  width: 100%;
  height: 100%;
}

.topic_right dl h3 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 15px;
}

.topic_right h3 a {
  color: #333;
}

.topic_right h3 a:hover {
  color: #333;
}

.topic_right dd {
  color: #999;
}

.topic_right b {
  font-size: 18px;
  color: #333;
}
.topic_right .desc {
  height: 70px;
  line-height: 24px;
  font-size: 14px;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.topic_right .desc a {
  color: #666;
}

.topic_right a:hover {
  color: #666;
  text-decoration: none;
}

@media (max-width:576px) {
  .topic_wrap {
    padding-left: 10px;
    padding-right: 10px;
  }

  .topic_left_wrap {
    position: relative;
  }

  .topic_left,
  .topic_right {
    float: unset;
    width: 100%;
    padding: 15px;
  }

  .topic_current {
    border-bottom: 1px solid #999;
    padding-bottom: 14px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
    position: relative;
  }

  .topic_left {
    position: absolute;
    top: 38px;
    box-shadow: none;
    border-radius: 0;
    display: none;
  }

  .topic_left li {
    padding-left: 0;
    padding-bottom: 10px;
    text-align: center;
  }

  .topic_left .sub {
    margin-top: 10px;
  }

  .topic_current::before {
    content: '';
    position: absolute;
    right: 0;
    top: 6px;
    width: 16px;
    height: 10px;
    background-image: url(../images/software_list_01.png);
    background-size: 100%;
  }

  .topic_right .topic_right_item li {
    width: 100%;
    padding: 15px;
    height: auto;
  }
  
  .topic_right dt {
    width: 75px;
    height: 75px;
    margin-right: 15px;
  }

  .topic_right dd {
    padding-top: 8px;
    font-size: 12px;
  }

  .topic_right dl h3 {
    margin-bottom: 5px;
    font-size: 18px;
  }

  .topic_right b {
    font-size: 16px;
  }

  .topic_right .desc {
    height: 45px;
    -webkit-line-clamp: 2;
  }
  
}