#expertise {
  position: relative;
  background-color: #f3f3f3;
}
.expertise-support {
  width: 100%;
  padding: 0 20px;
  color: #50525F;
  max-width: 1200px;
  margin: 0 auto;
}
.pc-expertise-support-title {
  font-size: 48px;
  text-align: center;
  padding-top: 80px;
  font-family: 'SourceHanSansCN-Bold';
}
.pc-expertise-support-content {
  padding: 80px 0;
}
.pc-expertise-support-item {
  display: flex;
  justify-content: center;
  align-items: stretch;
}
.content-item {
  flex: 1;
  padding: 40px 14px 60px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0px 0px 10px 5px rgb(0 0 0 / 20%);
  text-align: center;
}
.content-item+.content-item {
  margin-left: 40px;
}
.content-item .icon {
  font-size: 45px;
}
.item-title {
  font-size: 24px;
  line-height: 1.3;
  font-family: 'SourceHanSansCN-Medium';
}
.item-text {
  font-size: 18px;
  font-family: 'SourceHanSansCN-Normal';
}
.expertise-introduce {
  width: 100%;
  padding: 140px 0 100px;
  background-repeat: no-repeat;
  background-position: center center;
  background-attachment: scroll;
  background-size: cover;
  width: 100%;
  color: #fff;
}
.expertise-introduce-title {
  font-size: 48px;
  text-align: center;
  font-family: 'SourceHanSansCN-Bold';
}
.expertise-introduce-text {
  max-width: 700px;
  margin: 0 auto;
  font-size: 18px;
  text-align: center;
  font-family: 'SourceHanSansCN-Normal';
}
.expertise-introduce-title+.expertise-introduce-text {
  margin-top: 38px;
}
@media (max-width: 990px) {
  #expertise {
    position: relative;
  }
  .expertise-support {
    padding: 0 0.67rem;
  }
  .mb-expertise-support-title {
    font-size: 1.33rem;
    font-family: 'SourceHanSansCN-Bold';
    padding-top: 2.67rem;
    text-align: center;
  }
  .mb-expertise-support-content {
    padding: 2.67rem 0;
  }
  .mb-expertise-support-item {
    display: flex;
    justify-content: center;
    align-items: stretch;
  }
  .mb-expertise-support-item+.mb-expertise-support-item {
    margin-top: 1rem;
  }
  .content-item {
    padding: 0.5rem 1rem 1.2rem;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0px 0px 10px 5px rgb(0 0 0 / 20%);
    text-align: center;
  }
  .content-item+.content-item {
    margin-left: 1rem;
  }
  .content-item .icon {
    font-size: 1.5rem;
  }
  .item-title {
    font-size: 0.93rem;
  }
  .item-text {
    font-size: 0.8rem;
  }
  .expertise-introduce {
    padding: 2.2rem 0 2.3rem;
  }
  .expertise-introduce-title {
    font-size: 1.33rem;
  }
  .expertise-introduce-text {
    max-width: 100%;
    padding: 0.67rem;
    font-size: 0.67rem;
  }
  .expertise-introduce-title+.expertise-introduce-text {
    margin-top: 0.5rem;
  }
}