// .nav {
//   z-index: 99;
//   width: 100%;
//   padding-top: 48rpx;
//   background-color: #fff;
//   .logo {
//     width: 223rpx;
//   }
//   .nav_box {
//     position: relative;
//     display: flex;
//     align-items: center;
//     justify-content: center;
//     height: 64rpx;
//   }
// }

.nav_box {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  // justify-content: center;
  justify-content: space-between;
  align-items: center;
  background: #fff;
  border: 0;
  z-index: 99;
  padding-bottom: 2rpx;
  .logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 220rpx;
    font-size: 32rpx;
    font-family: PingFang SC;
    font-weight: bold;
    color: #000000;
  }
  .back {
    width: 100rpx;
    text-align: center;
    color: #666;
    font-size: 42rpx;
    display: flex;
    justify-content: center;
  }
  .back-btn {
    width: 40rpx;
    height: 40rpx;
    padding: 10rpx;
    .back-img {
      width: 100%;
      height: 100%;
    }
  }
}

.nav_top_padding {
  position: relative;
}