#header {
  width: 100%;
  height: 80px;
}
#header .nav {
  max-width: 1700px;
  min-width: 1200px;
  height: 100%;
  /* background-color: aqua; */
  margin: 0 auto;
}
.nav .logo {
  width: 163px;
  height: 49px;
  margin-top: 10px;
  float: left;
}
.nav ul {
  float: right;
  margin-top: 32px;
  margin-right: 150px;
}
.nav ul li {
  float: left;
  margin-left: 32px;
  font-family: "PingFang-SC-Regular";
  font-size: 16px;
  font-weight: normal;
  font-stretch: normal;
  letter-spacing: 0px;
  color: #000000;
}
.nav ul li a {
  color: #000000;
}
.swiper {
  width: 1184px;
  height: 450px;
  margin: 0 auto;
  background-image: url("../images/about/swiper.png");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  overflow: hidden;
}
.swiper > p {
  font-family: PingFang-SC-Bold;
  font-size: 30px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 60px;
  letter-spacing: 0px;
  color: #ffffff;
  text-align: center;
  margin-top: 372px;
}
.main {
  width: 1184px;
  margin: 0 auto;
}
.mian_nav {
  font-family: PingFang-SC-Regular;
  font-size: 16px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #cccccc;
  margin-top: 20px;
}
.about_text {
  color: #333333;
}
.case {
  width: 1200px;
  height: 1300px;
  margin: 0 auto;
  position: relative;
}
.case_list {
  margin: 15px auto 0;
  text-align: center;
  font-family: PingFang-SC-Regular;
  font-size: 18px;
  font-weight: normal;
  font-stretch: normal;
  letter-spacing: 0px;
  color: #00aaff;
  width: 300px;
  margin-bottom: 40px;
}
.case_list > span {
  display: inline-block;
  width: 80px;
  margin-left: 15px;
}
.case_box {
  width: 1185px;
  height: 784px;
}
.case_box > div {
  width: 384px;
  height: 384px;
  float: left;
  margin-left: 16px;
  margin-bottom: 16px;
  position: relative;
}
.case_box > div:nth-child(3n + 1) {
  margin-left: 0;
}
.case_num {
  font-family: PingFang-SC-Bold;
  font-size: 20px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 62px;
  left: 40px;
}
.case_p {
  font-family: PingFang-SC-Bold;
  font-size: 30px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 63px;
  left: 100px;
}
.case_to {
  font-family: PingFang-SC-Regular;
  font-size: 20px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 48px;
  letter-spacing: 0px;
  color: #ffffff;
  position: absolute;
  top: 140px;
  left: 100px;
}
.case_btn {
  display: inline-block;
  width: 280px;
  height: 60px;
  border-radius: 32px;
  border: solid 1px #00aaff;
  font-family: PingFang-SC-Regular;
  font-size: 18px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 24px;
  letter-spacing: 1px;
  color: #333333;
  text-align: center;
  line-height: 60px;
  margin-top: 150px;
  position: absolute;
  left: 460px;
}
.serve_title {
  margin-top: 40px;
  text-align: center;
}
.title_text {
  font-family: PingFang-SC-Bold;
  font-size: 22px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 40px;
  letter-spacing: 0px;
  color: #333333;
  text-align: center;
}
.id_blue {
  display: inline-block;
  width: 50px;
  height: 6px;
  background-color: #00aaff;
  margin-bottom: 15px;
  margin-top: 15px;
}
.footer {
  width: 100%;
  height: 220px;
  background-color: #0d0f1a;
}
.footer > ul {
  width: 800px;
  height: 180px;
  margin: 0 auto;
}
.footer > ul > li {
  float: left;
}
.footer>p {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.footer>p>a {
  color: #fff;
}
.li_1 {
  width: 300px;
  height: 100%;
}
.li_2 {
  width: 200px;
  height: 100%;
}
.li_3 {
  width: 200px;
  height: 100%;
}
.li_4 {
  width: 90px;
  height: 100%;
  text-align: center;
}
.p_big {
  font-family: PingFang-SC-Regular;
  font-size: 16px;
  font-weight: normal;
  font-stretch: normal;
  line-height: 41px;
  letter-spacing: 1px;
  color: #fff;
  margin-bottom: 18px;
  margin-top: 35px;
}
.p_small {
  font-family: PingFang-SC-Regular;
  font-size: 12px;
  margin-bottom: 8px;
  color: #fff;
}
.li_4>img{
  margin-top: 35px;
  margin-bottom: 10px;
}