*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    font-family: 'PingFang SC','Microsoft YaHei','Helvetica Neue','Helvetica','Arial',sans-serif;
    padding-top: 1.3333rem;
}
@media screen and (min-width: 750px) {
    html {
      font-size: 75px!important;
    }
}
a {
    text-decoration: none;
}
.top_main {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 10rem;
    height: 1.3333rem;
    z-index: 50;
    background-color: #fff;
    box-shadow: 0 0 0.0933rem 0.0267rem #c9cdd4;
}
.logo{
    position: absolute;
    left: 0.4rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
}
.logo img{
    height: .6rem;
}
.logo h3{
    margin-left: .16rem;
    font-size: .36rem;
    color: #000;
}
.top_nav_box {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translate(-50%,-0.1rem);
    width: 10rem;
    height: 1.3333rem;
    z-index: 999;
  }
  .nav_btn {
    position: absolute;
    top: 0.4267rem;
    right: 0.28rem;
    width: 0.72rem;
    height: 0.72rem;
  }
  ul {
    list-style: none;
  }
  .nav_btn ul {
    position: absolute;
    width: 0.32rem;
    height: 0.32rem;
    left: 0.2rem;
    top: 0.2rem;
  }
  .nav_btn .nbx_close {
    position: absolute;
    width: 0.32rem;
    height: 0.32rem;
    left: 0.2rem;
    top: 0.2rem;
  }
  .nav_btn .nbx_open {
    position: absolute;
    width: 0.32rem;
    height: 0.32rem;
    left: 0.2rem;
    top: 0.2rem;
  }
  .nbx li:nth-child(1) {
    width: 0.32rem;
    height: 0.04rem;
    border-radius: 0.02rem;
    background-color: #2c2c2c;
    position: absolute;
    left: 0;
    top: 0;
  }
  .nbx li:nth-child(2) {
    width: 0.32rem;
    height: 0.04rem;
    border-radius: 0.02rem;
    background-color: #2c2c2c;
    position: absolute;
    left: 0;
    top: 0.14rem;
  }
  .nbx li:nth-child(3) {
    width: 0.32rem;
    height: 0.04rem;
    border-radius: 0.02rem;
    background-color: #2c2c2c;
    position: absolute;
    left: 0;
    top: 0.28rem;
  }
  .nbx_close li:nth-child(1) {
    animation: nbx_o1 1s forwards;
  }
  .nbx_close li:nth-child(2) {
    animation: nbx_o2 1s forwards;
  }
  .nbx_close li:nth-child(3) {
    animation: nbx_o3 1s forwards;
  }
  @keyframes nbx_o1 {
    0% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0;
    }
    100% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: -0.0267rem;
      top: 0.14rem;
      transform: rotate(45deg);
    }
  }
  @keyframes nbx_o2 {
    0% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0.14rem;
    }
    100% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: -0.0267rem;
      top: 0.14rem;
      transform: rotate(45deg);
    }
  }
  @keyframes nbx_o3 {
    0% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0.28rem;
    }
    100% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: -0.0267rem;
      top: 0.14rem;
      transform: rotate(-45deg);
    }
  }
  .nbx_open li:nth-child(1) {
    animation: nbx_c1 1s forwards;
  }
  .nbx_open li:nth-child(2) {
    animation: nbx_c2 1s forwards;
  }
  .nbx_open li:nth-child(3) {
    animation: nbx_c3 1s forwards;
  }
  @keyframes nbx_c1 {
    0% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: 0.0267rem;
      top: 0.14rem;
      transform: rotate(45deg);
    }
    100% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0;
    }
  }
  @keyframes nbx_c2 {
    0% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: 0.0267rem;
      top: 0.14rem;
      transform: rotate(45deg);
    }
    100% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0.14rem;
    }
  }
  @keyframes nbx_c3 {
    0% {
      width: 0.3733rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: orangered;
      position: absolute;
      left: -0.0267rem;
      top: 0.14rem;
      transform: rotate(-45deg);
    }
    100% {
      width: 0.32rem;
      height: 0.04rem;
      border-radius: 0.02rem;
      background-color: #2c2c2c;
      position: absolute;
      left: 0;
      top: 0.28rem;
    }
  }
  .nav_zao {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 97;
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0;
    animation: zao_close 0.8s linear 0.4s forwards;
  }
  @keyframes zao_close {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 0.6;
    }
  }
  nav {
    position: fixed;
    right: 0;
    top: 0;
    width: 5rem;
    height: 100%;
    background-color: #fff;
    display: none;
    z-index: 98;
    transition: all 1s;
  }
  nav ul {
    padding-top: 1.8667rem;
    list-style: none;
  }
  nav li {
    height: 1.04rem;
    line-height: 1.04rem;
    border-bottom: 0.0267rem solid #f2f3f6;
  }
  nav a {
    font-size: 0.4rem;
    text-decoration: none;
    padding-right: 0.4rem;
    color: #000;
    display: block;
    padding-left: .4rem;
    box-sizing: border-box;
    line-height: 0.9067rem;
  }
  .nav_chu {
    display: block;
    animation: chu 0.6s;
  }
  @keyframes chu {
    0% {
      transform: translateX(5rem);
      opacity: 0;
    }
    100% {
      transform: translateX(0);
      opacity: 1;
    }
  }
  .nav_jin {
    animation: jin 0.6s linear 0.1s forwards;
    transition: all 1s;
  }
  @keyframes jin {
    0% {
      transform: translateX(0);
      opacity: 1;
    }
    100% {
      transform: translateX(5rem);
      opacity: 0;
    }
  } 

footer{
    width: 100%;
    max-width: 1200px;
    background-color: #fff;
    padding-top: 40px;
    padding-bottom: 40px;
    display: flex;
    justify-content: center;
    margin: auto; /* 使底部布局居中 */
}
footer a{
    font-size: 12px;
    color: #3491FA;
}
.footer-column {
    flex: 1;
    padding: 0 8px;
}
.footer-column h5 {
    font-size: 12px;
    margin-top: 0;
    color: #333;
}
.footer-column ul {
    list-style: none;
    padding: 0;
    margin-top: 10px;
}
.footer-column li {
    font-size: 12px;
    color: #333;
    padding-bottom: 4px;
}

.divider {
  height: 1px;
  background-color: #eee;
  width: 90%; 
  margin: 32px auto;
}

.copyright{
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding-bottom: 40px;
  font-size: 12px;
  margin-top: 8px;
  color: #bbb;
}
.copyright a{
  color: #3491FA;
}