.part-1 {
  width: 100%;
  margin: 30px auto 20px;
  box-sizing: border-box;
  padding: 0 20px;
}
.part-1-img {
  width: 100%;
  border-radius: 10px;
  overflow: hidden;
}
.part-1-img img {
  width: 100%;
  height: auto;
  display: block;
}
.part-1-nav h1 {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #333333;
  margin: 10px auto;
}
.part-1-nav p {
  font-size: 12px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #666666;
  line-height: 1.8;
  text-align: justify;
}

.part-2 img {
  width: 100%;
  height: auto;
}

.part-3 {
  margin: 10px auto 0;
  box-sizing: border-box;
  padding: 0 20px;
}
.system-list {
  margin-top: 30px;
}
.list-item {
  width: 100%;
  background: #ffffff;
  box-shadow: 0px 2px 10px 0px rgba(204, 204, 204, 0.3);
  border-radius: 10px;
  margin-bottom: 20px;
  display: flex;
  box-sizing: border-box;
  padding: 20px 10px;
  align-items: center;
}
.img-box,
.img-box img {
  width: 35px;
  height: 35px;
  margin-right: 10px;
}
.list-nav h1 {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #333333;
  margin-bottom: 5px;
}
.list-nav p {
  font-size: 12px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #666666;
  line-height: 1.8;
}