.ctn {
  padding: 160px 0;
}
.ctn ul {
  border-left: 1px dashed var(--blue);
}
.ctn ul li {
  display: flex;
  justify-content: space-between;
  padding-bottom: 136px;
}
.ctn ul li .year {
  width: 19.6%;
}
.ctn ul li .year h2 {
  font-weight: 700;
  color: var(--blue);
  padding-left: 30px;
  position: relative;
}
.ctn ul li .year h2:before {
  content: '';
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--blue);
  position: absolute;
  left: -9px;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
}
.ctn ul li .tu {
  width: 27%;
  height: 220px;
  overflow: hidden;
}
.ctn ul li .tu img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ctn ul li .text {
  width: 53.4%;
  padding-left: 70px;
  padding-right: 30px;
  height: 220px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #005698 rgba(0, 0, 0, 0.1);
  scrollbar-base-color: #005698;
  scrollbar-track-color: rgba(0, 0, 0, 0.1);
  scrollbar-arrow-color: rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
}
.ctn ul li .text .txt {
  max-height: 100%;
}
.ctn ul li .text .txt p {
  line-height: 1.8;
  position: relative;
  padding-left: 14px;
}
.ctn ul li .text .txt p:before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
  position: absolute;
  left: 0;
  top: 12px;
}
.ctn ul li .text::-webkit-scrollbar {
  width: 5px;
}
.ctn ul li .text::-webkit-scrollbar-track {
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.1);
}
.ctn ul li .text::-webkit-scrollbar-thumb {
  border-radius: 3px;
  background: #005698;
}
.ctn ul li:hover .tu img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn ul li:hover .text .txt p {
  font-weight: 700;
}
.ctn .hist_page {
  width: 200px;
  height: 48px;
  border-radius: 3px;
  background: var(--blue);
  color: #fff;
  text-align: center;
  line-height: 48px;
  margin: 0 auto;
  cursor: pointer;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn .hist_page:hover {
  background: #024c95;
}
@media screen and (max-width: 1600px) {
  .ctn {
    padding: 8vw 0;
  }
  .ctn ul li {
    padding-bottom: 6vw;
  }
  .ctn ul li .tu {
    height: 180px;
  }
  .ctn ul li .text {
    height: 180px;
    padding-left: 3.5vw;
  }
  .ctn ul li .text .txt p:before {
    top: 10px;
  }
  .ctn .hist_page {
    width: 160px;
    height: 44px;
    line-height: 44px;
  }
}
@media screen and (max-width: 1024px) {
  .ctn ul li .tu {
    height: 150px;
  }
  .ctn ul li .text {
    height: 150px;
  }
}
@media screen and (max-width: 768px) {
  .ctn {
    padding: 40px 0;
  }
  .ctn ul li {
    flex-wrap: wrap;
    padding-bottom: 30px;
  }
  .ctn ul li .year h2 {
    padding-left: 24px;
  }
  .ctn ul li .year h2:before {
    width: 11px;
    height: 11px;
    left: -7px;
  }
  .ctn ul li .tu {
    width: 100%;
    padding-left: 24px;
    margin: 14px 0 20px;
  }
  .ctn ul li .text {
    width: 100%;
    padding-left: 24px;
    height: auto;
    padding-right: 0;
  }
  .ctn .hist_page {
    width: 138px;
    margin-top: 20px;
  }
}