@keyframes dow_arr1 {
  0% {
    opacity: 0;
  }
  24% {
    opacity: 0;
  }
  25% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes dow_arr2 {
  0% {
    opacity: 0;
  }
  49% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes large-s {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.05);
  }
}
.ctn_1 {
  width: 100%;
  overflow: hidden;
  padding: 4rem 0;
  background-position: top center;
  background-repeat: no-repeat;
}
.ctn_1 .w1100 {
  width: 1100px;
  margin: 0 auto;
}
.ctn_1 .w1100 .tit {
  color: #222;
  text-align: center;
}
.ctn_1 .w1100 .sw_history {
  height: 920px;
  padding-bottom: 200px;
  margin-top: 3rem;
}
.ctn_1 .w1100 .sw_history .line {
  width: 1px;
  height: 100%;
  background-color: #eaebeb;
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}
.ctn_1 .w1100 .sw_history .swiper-slide {
  height: 250px;
  transition: all 0.5s;
}
.ctn_1 .w1100 .sw_history .swiper-slide .item .dot {
  width: 19px;
  margin: 20px auto 0;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des {
  margin-top: -39px;
  width: 46%;
  border: 1px solid #d3c7bb;
  padding: 2%;
  position: relative;
  z-index: 2;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des:hover {
  background-color: #b1987f;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des:hover .img img {
  transform: translate(-50%, -50%) scale(1.05);
}
.ctn_1 .w1100 .sw_history .swiper-slide .des:hover .txt p {
  color: #fff;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des:hover .txt span {
  color: #fff;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des .img {
  position: relative;
  width: 100%;
  padding-top: 56%;
  overflow: hidden;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des .img img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.ctn_1 .w1100 .sw_history .swiper-slide .des .txt p {
  font-weight: bold;
  color: #111;
  display: block;
  transition: all 0.3s;
}
.ctn_1 .w1100 .sw_history .swiper-slide .des .txt span {
  display: block;
  color: #222;
  transition: all 0.3s;
}
.ctn_1 .w1100 .sw_history .swiper-slide:nth-child(even) .des {
  margin-left: 54%;
}
@media screen and (max-width: 1200px) {
  .ctn_1 .w1100 {
    width: 94%;
  }
}
@media screen and (max-width: 1024px) {
  .ctn_1 .w1100 .sw_history {
    height: auto;
    padding-bottom: 200px;
  }
  .ctn_1 .w1100 .sw_history .swiper-wrapper {
    flex-wrap: wrap;
  }
}
@media screen and (max-width: 998px) {
  .ctn_1 .w1100 .sw_history .swiper-slide {
    height: 180px;
  }
}
@media screen and (max-width: 768px) {
  .ctn_1 .w1100 .sw_history .swiper-slide {
    height: 140px;
  }
  .ctn_1 .w1100 .sw_history {
    height: auto;
    padding-bottom: 100px;
  }
}