.ctn1 .center {
  width: 1000px;
  margin: 0 auto;
}
.ctn1 .center .titles p {
  margin-top: 14px;
  color: #666;
}
.ctn1 .center .ctn-list ul li {
  border-top: 1px solid #dadada;
}
.ctn1 .center .ctn-list ul li .top {
  position: relative;
  cursor: pointer;
  padding: 34px 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn1 .center .ctn-list ul li .top h3 {
  color: #666;
  padding-left: 15px;
  position: absolute;
  left: 0;
  top: 24px;
  opacity: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn1 .center .ctn-list ul li .top h3:before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color);
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
}
.ctn1 .center .ctn-list ul li .top .title {
  display: flex;
  padding-right: 40px;
  position: relative;
}
.ctn1 .center .ctn-list ul li .top .title .icons {
  width: 28px;
  flex-shrink: 0;
  margin-right: 14px;
  position: relative;
  top: 0;
}
.ctn1 .center .ctn-list ul li .top .title .icons svg {
  width: 28px;
}
.ctn1 .center .ctn-list ul li .top .title .icons svg path {
  fill: #e6e6e6;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn1 .center .ctn-list ul li .top .title .sign {
  position: absolute;
  width: 13px;
  height: 13px;
  right: 0;
  top: 13px;
}
.ctn1 .center .ctn-list ul li .top .title .sign:before {
  content: '';
  width: 100%;
  height: 1px;
  background: #1A1819;
  position: absolute;
  left: 0;
  top: 6px;
}
.ctn1 .center .ctn-list ul li .top .title .sign:after {
  content: '';
  width: 1px;
  height: 100%;
  background: #1A1819;
  position: absolute;
  left: 6px;
  top: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn1 .center .ctn-list ul li .bottom {
  padding-bottom: 40px;
  display: none;
}
.ctn1 .center .ctn-list ul li .bottom p {
  color: #666666;
  width: 85%;
}
.ctn1 .center .ctn-list ul li:hover .top .title .icons svg path {
  fill: #1A1819;
}
.ctn1 .center .ctn-list ul li.active .top {
  padding: 60px 0 34px;
}
.ctn1 .center .ctn-list ul li.active .top h3 {
  opacity: 1;
}
.ctn1 .center .ctn-list ul li.active .top .title .icons svg path {
  fill: #1A1819;
}
.ctn1 .center .ctn-list ul li.active .top .title .sign:after {
  opacity: 0;
}
.ctn2 {
  position: relative;
  overflow: hidden;
}
.ctn2 .tu {
  position: relative;
  overflow: hidden;
}
.ctn2 .tu:before {
  content: '';
  display: block;
  padding-top: calc(583 / 1920 * 100%);
}
.ctn2 .tu img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  left: 0;
  top: 0;
}
.ctn2 .text {
  position: absolute;
  width: 100%;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  color: #fff;
  text-align: center;
}
.ctn2 .text p {
  margin: 20px 0 30px;
}
.ctn2 .text .s-mores {
  display: flex;
  justify-content: center;
}
@media screen and (max-width: 1680px) {
  .ctn1 .center .ctn-list ul li .top {
    padding: 28px 0;
  }
  .ctn1 .center .ctn-list ul li .top h3 {
    top: 20px;
  }
  .ctn1 .center .ctn-list ul li .top .title .icons {
    width: 24px;
  }
  .ctn1 .center .ctn-list ul li .top .title .icons svg {
    width: 24px;
    height: 28px;
  }
  .ctn1 .center .ctn-list ul li .top .title .sign {
    top: 11px;
  }
  .ctn1 .center .ctn-list ul li .bottom {
    padding-bottom: 30px;
  }
  .ctn1 .center .ctn-list ul li.active .top {
    padding: 50px 0 28px;
  }
  .ctn2 .text p {
    margin: 14px 0 20px;
  }
}
@media screen and (max-width: 1440px) {
  .ctn1 .center {
    width: 900px;
    max-width: 100%;
  }
}
@media screen and (max-width: 768px) {
  .ctn1 .center .titles p {
    margin-top: 10px;
  }
  .ctn1 .center .ctn-list ul li .top {
    padding: 20px 0;
  }
  .ctn1 .center .ctn-list ul li .bottom {
    padding-bottom: 20px;
  }
  .ctn1 .center .ctn-list ul li .bottom p {
    width: 100%;
  }
  .ctn1 .center .ctn-list ul li.active .top {
    padding: 50px 0 20px;
  }
  .ctn2 {
    padding-bottom: 9vw;
  }
  .ctn2 .tu {
    width: 90%;
    margin: 0 auto;
    border-radius: 10px;
  }
  .ctn2 .text {
    width: 90%;
    margin: 20px auto 0;
    position: relative;
    color: #333;
    top: 0;
    transform: translateY(0);
    -webkit-transform: translateY(0);
    -moz-transform: translateY(0);
    -ms-transform: translateY(0);
    text-align: left;
  }
  .ctn2 .text .s-mores {
    display: block;
  }
  .ctn2 .text .s-mores a {
    border: 1px solid #333;
  }
}