/* 产品与服务 */
#service-ul {
  max-width: 1900px;
  width: 100%;
  display: flex;
  justify-content: center;
  column-gap: 18px;
  margin: 0 auto;
}

.service-li {
  flex: 0 0 calc((100% - 72px) / 5);
  transition: all .5s;
}

.service-li .img-item {
  height: 466px;
  width: 100%;
  position: relative;
}

.img-item .front {
  height: 466px;
  width: 100%;
}

.img-item:nth-child(1) {
  margin-bottom: 20px;
}

.front>img {
  height: 466px;
  object-fit: cover;
  border-radius: 25px;
}

.img-item .mask {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 2;
  border-radius: 25px;
  background: rgba(13, 53, 201, 0);
  transition: all 1s;
  color: rgba(255, 255, 255, 0);
}

.img-item:hover .mask {
  background: rgba(13, 53, 201, 0.55);
  color: rgba(255, 255, 255, 1);
  cursor: pointer;
}

.img-item:hover .mask-top-title,
.img-item:hover .mask-top-icon {
  background: #fff;
  opacity: 1;
  visibility: visible;
}

.img-item:hover .icon {
  width: 32px;
  height: 32px;
}

.img-item:hover .mask-desc {
  color: rgba(255, 255, 255, 1);
}

.title-left-bottom {
  margin: 3.5rem 0 6rem 7rem;
}

.title-right-top {
  margin: 6rem 0 3.5rem 3.5rem;
}

.title-right-bottom {
  margin: 3.5rem 0 6rem 3.5rem;
}

.title-left-top {
  margin: 6rem 0 40px 7rem;
}

.icon-left-bottom {
  bottom: -30px;
  left: -40px;
}

.icon-right-top {
  top: -30px;
  right: -40px;
}

.icon-right-bottom {
  right: -40px;
  bottom: -30px;
}

.icon-left-top {
  top: -30px;
  left: -40px;
}

.mask-top-title {
  width: fit-content;
  height: fit-content;
  max-width: 205px;
  max-height: 97px;
  border-radius: 8px;
  font-size: 2rem;
  opacity: 0;
  background: rgba(255, 255, 255, 0);
  line-height: 30px;
  padding: 18px;
  box-sizing: border-box;
  position: relative;
  z-index: 4;
  transition: all 1s;
}

.top-title-mask{
  display: flex;
  overflow: hidden;
}

.mask-top-icon {
  z-index: -1;
  width: 80px;
  height: 60px;
  border-radius: 8px;
  position: absolute;
  transition: all 1s;
  background: rgba(255, 255, 255, 0);
}

.mask-top-icon img {
  width: 0px;
  height: 0px;
  text-align: center;
  transition: all 1s;
}

.mask-desc {
  font-size: 1.8rem;
  color: rgba(255, 255, 255, 0);
  padding: 0 40px;
  overflow: hidden;
}

.mask-desc-span{
  display: flex;
  transform: translateY(105%);
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.52, 0.01, 0, 1) 0s;
  transition-delay:0.5s;
}

.mask-top-title .top-title-span {
  white-space: pre-wrap;
  transform: translateY(105%);
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.52, 0.01, 0, 1) 0s;
}

.img-item:hover .top-title-span{
  transform: translateY(0);
}

.img-item:hover .mask-desc-span{
  transform: translateY(0);
}