.desy-about3 {
  padding: 70px 0 0;
  position: relative;
}

.desy-about3::after {
  content: "";
  background: #F8F8F8;
  height: 195px;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.desy-about3 .tit {
  text-align: center;
  position: relative;
  z-index: 10;
}

.desy-about3 .tit h3 {
  font-size: 36px;
  color: var(--title-text-color);
  line-height: 48px;
  font-weight: 700;
}

.desy-about3 .tit p {
  font-size: 18px;
  color: #666;
  line-height: 2;
  max-width: 850px;
  margin: 30px auto 0;
}

.desy-about3 .list {
  margin: 70px 0 0;
  box-shadow: 0 0 29px rgba(14, 4, 9, 0.09);
  padding: 70px;
  background: #fff;
  position: relative;
  z-index: 10;
}

.desy-about3 ul {
  /* margin: 0 -35px;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap; */
 /* display: flex;
  flex-wrap: wrap;
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none; */
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;

}

.desy-about3 ul li {
 /* width: 33.333333%;       保持3列 */
  /* padding: 20px 42px;      上下padding增加，左右减小 */
  padding: 30px 35px;      /* 上下padding增加，左右减小 */
  text-align: center;
  position: relative;
  
  /* 关键：使用flex让内容垂直居中 */
  display: flex;
  flex-direction: column;
  justify-content: center;    /* 垂直居中 */
  align-items: center;         /* 水平居中 */
  /* min-height: 120px;          统一最小高度 */
  min-height: 200px;          /* 统一最小高度 */
  box-sizing: border-box;
}

.desy-about3 ul li:not(:nth-child(3n+1))::after {
  content: "";
  width: 1px;
  /* height: 100%; */
  height: 60px;
  background: #ddd;
  position: absolute;
  left: 0;
  /* top: 0; */
  top: 50%;
  transform: translate(-50%);
  bottom: auto;
}
.desy-about3 ul li:nth-child(-n+3){
  border-bottom: 1px solid #ddd;
}

.desy-about3 ul li:nth-child(-n+3) .box {
  /* padding-bottom: 30px; */
  padding-bottom: 0px;
}

.desy-about3 ul li:nth-child(n+4) .box {
  /* border-top: 1px solid #ddd; */
  border-top: none;
  /* padding-top: 30px; */
  padding-top: 0px;
}

.desy-about3 ul li h6 {
  font-size: 56px;
  color: #212121;
  line-height: 1;
  font-weight: 700;
  white-space: nowrap;
}

.desy-about3 ul li h6 em {
  font-weight: 700;
}
.desy-about3 ul li .box{
   display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
}

.desy-about3 ul li p {
  font-size: 18px;
  color: #666;
  margin-top: 15px;
  max-width: 100%;
  word-break: break-word;
  line-height: 1.5;
}

@media screen and (max-width:1400px) {
  .desy-about3 .tit h3{
    font-size: 32px;
  }

  .desy-about3 ul li h6 {
    font-size: 50px;
  }

  .desy-about3 ul li p {
    font-size: 17px;
  }
}

@media screen and (max-width:768px) {
  .desy-about3 .tit h3 {
    font-size: 28px;
  }

  .desy-about3 {
    padding: 30px 0 0;
  }

  .desy-about3::after {
    display: none;
  }

  .desy-about3 .tit p {
    font-size: 16px;
    line-height: 1.4;
    margin: 20px auto 0;
  }

  .desy-about3 .list {
    margin: 30px 0 0;
    box-shadow: 0 0 10px rgba(14, 4, 9, 0.09);
    padding: 20px;
    background: #fff;
    position: relative;
    z-index: 10;
  }

  .desy-about3 ul {
    margin: 0 -10px;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
  }

  .desy-about3 ul li {
    width: 50%;
    padding: 10px 10px;
    text-align: center;
    position: relative;
  }

  .desy-about3 ul li:not(:nth-child(3n+1))::after {
    display: none;
  }

  .desy-about3 ul li:nth-child(-n+3) .box {
    padding-bottom: 10px;
  }

  .desy-about3 ul li:nth-child(n+4) .box {
    border-top: none;
    padding-top: 10px;
  }

  .desy-about3 ul li h6 {
    font-size: 30px;
  }

  .desy-about3 ul li p {
    font-size: 16px;
    margin-top: 10px;
  }
}


@media screen and (max-width:480px) {
  .desy-about3 .tit h3 {
    font-size: 24px;
  }

  .desy-about3 ul li {
    width: 100%;
  }
}
@media screen and (min-width: 769px) and (max-width: 1100px) {
  .desy-about3 ul {
    grid-template-columns: repeat(2, 1fr);
  }

  .desy-about3 ul li {
    min-height: 160px;
  }

  /* 竖线：只在偶数列（第2列）显示 */
  .desy-about3 ul li:not(:nth-child(3n+1))::after {
    display: none;
  }

  .desy-about3 ul li:nth-child(even)::after {
    content: "";
    width: 1px;
    height: 50px;
    background: #ddd;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    display: block;
  }
  /* 横线：每 2 个一组，第一行底部加横线 */
  .desy-about3 ul li:nth-child(-n+3) {
    border-bottom: none;
  }

  .desy-about3 ul li:nth-child(-n+2) {
    border-bottom: 1px solid #ddd;
  }

  .desy-about3 ul li:nth-child(n+3) .box {
    padding-top: 0;
  }

  .desy-about3 ul li h6 {
    font-size: 40px;
  }

  .desy-about3 ul li p {
    font-size: 15px;
    margin-top: 10px;
    line-height: 1.6;
  }

}