.common-subtitle {
  width: 800px;
  margin: auto;
}

.sec:nth-child(2n + 1) {
  background: #F9FAFF;
}

.sec1 .sec-content {
  text-align: center;
}

.sec1 .sec-content img {
  max-width: 100%;
}

.sec2 .sec-content {
  margin-top: 30px;
}

.sec2 .item {
  width: 386px;
  height: 200px;
  float: left;
  background: linear-gradient(180deg, #F4F5F8 0%, #FFFFFF 100%);
  box-shadow: 0px 4px 6px 0px #EFF3F9;
  border-radius: 12px;
  margin-right: 21px;
  position: relative;
  cursor: pointer;
  padding: 0 33px;
}

.sec2 .item:nth-child(3n) {
  margin-right: 0;
}

.sec2 .item .img-box {
  width: 164px;
  height: 90px;
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -50%);
}

.sec2 .item .title {
  margin-top: 74px;
  font-size: 20px;
  font-weight: 600;
  color: #000;
  line-height: 28px;
  text-align: center;
}

.sec2 .item .desc {
  font-size: 16px;
  color: #666;
  margin-top: 16px;
  text-align: center;
  line-height: 22px;
  text-overflow: -o-ellipsis-lastline;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
}

.sec3 .item {
  width: 386px;
  height: 200px;
  margin-right: 21px;
  background: linear-gradient(180deg, #F4F5F8 0%, #FFFFFF 100%);
  box-shadow: 0px 4px 6px 0px #EFF3F9;
  border-radius: 12px;
  margin-top: 21px;
  float: left;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 30px;
  cursor: pointer;
}

.sec3 .item:nth-child(-n+3) {
  margin-top: 0;
}

.sec3 .item:nth-child(3n) {
  margin-right: 0;
}

.sec3 .item .img-box {
  width: 98px;
  margin-right: 17px;
  flex-shrink: 0;
}

.sec3 .item .title {
  font-size: 20px;
  color: #000;
  line-height: 28px;
  font-weight: 600;
}

.sec3 .item .desc {
  font-size: 16px;
  color: #666;
  line-height: 22px;
  margin-top: 16px;
}

.sec4 .item {
  margin-right: 21px;
  margin-top: 21px;
  position: relative;
  float: left;
}

.sec4 .item:nth-child(-n+3) {
  margin-top: 0;
}

.sec4 .item:nth-child(3n) {
  margin-right: 0;
}

.sec4 .item .img-box {
  width: 386px;
  height: 200px;
}

.sec4 .item .title {
  font-size: 24px;
  color: #000;
  font-weight: 600;
  line-height: 33px;
  margin-top: 20px;
  text-align: center;
}