.banner {
  margin: 0 auto;
  max-width: 1660px;
  height: auto;
  overflow: hidden;
}
.banner .pr {
  padding-bottom: 48.193%;
}
.banner .ab5 {
  position: absolute;
  top: 0;
  right: 6%;
  width: 47.35%;
  height: auto;
}
.banner .ab4 {
  position: absolute;
  top: 23.875%;
  left: 7.187%;
  width: 51.687%;
  height: auto;
}
.seek-img {
  width: 100%;
  height: auto;
  margin-top: -7.291%;
}
.about {
  margin-top: 6.25%;
  width: 100%;
  height: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.about .l {
  width: 50%;
  height: auto;
  padding-right: 30px;
}
.about .lt {
  width: 100%;
  height: auto;
}
.about .lt h4 {
  position: relative;
  width: 100%;
  color: #251616;
  letter-spacing: 1px;
  overflow: hidden;
}
.about .lt h4:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
.about .lt .lt1 {
  height: 1.607em;
  font-size: 28px;
  line-height: 1.607em;
}
.about .lt .lt2 {
  height: 1.875em;
  font-size: 24px;
  line-height: 1.875em;
  margin: 10px 0 15px;
}
.about .lt .lt3 {
  height: 2.25em;
  font-size: 20px;
  line-height: 2.25em;
}
.about .lm {
  margin: 20px 0 40px;
  width: 100%;
  height: auto;
}
.about .lm p {
  position: relative;
  width: 100%;
  height: auto;
  font-size: 16px;
  line-height: 2.1875em;
  letter-spacing: 1px;
  color: #5a5a5a;
  overflow: hidden;
}
.about .lm p:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
.about .lb {
  width: 100%;
  height: auto;
  display: flex;
}
.about .lb .lb-dv:hover h4:before {
  transform: translateX(15px) rotate(360deg);
}
.about .lb .lb-dv {
  position: relative;
  width: 30.5%;
  height: auto;
  cursor: pointer;
}
.about .lb .lb-dv h4 {
  position: relative;
  display: inline-block;
  font-size: 45px;
  color: #1b1b1b;
  margin-bottom: 5px;
}
.about .lb .lb-dv h4:before {
  content: '';
  position: absolute;
  top: -5px;
  right: -25px;
  width: 22px;
  height: 22px;
  transition: all 0.5s;
}
.about .lb .lb-dv span {
  display: block;
}
.about .lb .year:before {
  content: '';
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  width: 1px;
  height: 40%;
  background-color: #a0a0a0;
}
.about .lb .year h4:before {
  background: transparent url('../images/ab2.png') no-repeat;
  background-size: 100% 100%;
}
.about .lb .customer {
  margin-left: 12%;
}
.about .lb .customer h4:before {
  background: transparent url('../images/ab3.png') no-repeat;
  background-size: 100% 100%;
}
.about .r {
  padding-left: 30px;
  padding-top: 2.639%;
  width: 50%;
  height: auto;
  text-align: right;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  overflow: hidden;
  cursor: pointer;
}
.about .r h4 {
  transition: all 0.5s;
}
.about .r:hover h4 {
  transform: translateX(-20px);
}
.about .rt {
  width: 100%;
  height: auto;
}
.about .rt p {
  position: relative;
  width: 100%;
  height: auto;
  font-size: 16px;
  line-height: 2.1875em;
  letter-spacing: 1px;
  color: #5a5a5a;
  overflow: hidden;
}
.about .rt p:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
.about .rt h4 {
  position: relative;
  width: 100%;
  height: 2em;
  font-size: 25px;
  line-height: 2em;
  color: #251616;
  overflow: hidden;
}
.about .rt h4:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
.about .rb {
  margin-top: 20px;
  display: block;
  width: 168px;
  height: 58px;
  line-height: 58px;
  text-align: center;
  font-size: 18px;
  color: #fff;
  background-color: #251616;
  transition: all 0.5s;
}
.about .rb:hover {
  background-color: #f2ae42;
}
@media screen and (max-width: 991px) and (min-width: 768px) {
  .about .l {
    width: 55%;
    padding-right: 0;
  }
  .about .lt .lt2 {
    margin: 10px 0;
  }
  .about .lb .lb-dv {
    width: 40%;
  }
  .about .lb .lb-dv h4 {
    font-size: 34px;
  }
  .about .r {
    width: 45%;
    padding-left: 10px;
  }
  .about .rb {
    width: 135px;
    height: 55px;
    line-height: 55px;
  }
  .foot {
    margin-top: 50px;
  }
}
@media screen and (max-width: 767px) {
  .about .l {
    width: 100%;
    padding-right: 0;
    text-align: center;
  }
  .about .lt .lt1 {
    font-size: 20px;
  }
  .about .lt .lt2 {
    font-size: 18px;
    margin: 0;
  }
  .about .lt .lt3 {
    height: 2em;
    line-height: 2em;
    font-size: 18px;
  }
  .about .lm {
    margin: 5px 0 20px;
  }
  .about .lm p {
    line-height: 1.875em;
  }
  .about .lb {
    margin: 20px 0 10px;
  }
  .about .lb .lb-dv {
    width: 50%;
  }
  .about .lb .lb-dv h4 {
    font-size: 30px;
  }
  .about .lb .lb-dv h4:before {
    content: '年';
    border-radius: 50%;
    font-size: 12px;
    width: 20px;
    height: 20px;
    line-height: 22px;
    text-align: center;
    border: 1px solid #333;
    background: transparent;
  }
  .about .lb .customer {
    margin-left: 0;
  }
  .about .lb .customer h4:before {
    content: '个';
  }
  .about .r {
    width: 100%;
    padding-left: 0;
    text-align: center;
  }
  .about .r:hover h4 {
    transform: translateX(0);
  }
  .about .rt h4 {
    font-size: 18px;
  }
  .about .rb {
    margin: 20px auto 0;
    width: 135px;
    height: 50px;
    line-height: 50px;
  }
  .about .rb:hover {
    background-color: #251616;
  }
}
/***************** animate ********************************/
.banner.o1 {
  -webkit-animation: hr-t 1s linear both;
  animation: hr-t 1s linear both;
}
.banner.o1 .ab5 {
  -webkit-animation: xr 4s 1s linear backwards,
    r360 12s 5s linear infinite forwards;
  animation: xr 4s 1s linear backwards, r360 12s 5s linear infinite forwards;
}
.seek.o1 {
  -webkit-animation: sf-x 0.8s 1s ease-out both;
  animation: sf-x 0.8s 1s ease-out both;
}
.about .l.o1 {
  overflow: hidden;
}
.about .l.o1 .lt h4:before,
.about .l.o1 p:before {
  -webkit-animation: l-r 1.5s linear both;
  animation: l-r 1.5s linear both;
}
.about .l.o1 .lb-dv {
  -webkit-animation: sf 0.7s 1s linear both;
  animation: sf 0.7s 1s linear both;
}
.about .r.o1 p:before,
.about .r.o1 h4:before {
  -webkit-animation: r-l 1.5s linear both;
  animation: r-l 1.5s linear both;
}
.about .r.o1 .btn {
  -webkit-animation: hr-b 0.8s 1s ease-out both;
  animation: hr-b 0.8s 1s ease-out both;
}