.navigation {
  width: 100%;
  height: 6rem;
  background-image: url('../img/5-about-us/about_banner.jpg');
  background-repeat: no-repeat;
  background-size: cover;
}
.navigation_top {
  height: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-right: 1.2rem;
}
.menu_bar {
  display: flex;
  position: relative;
  height: 0.8rem;
}
.menu_bar .menu_bar_item {
  height: 0.8rem;
  margin-right: 0.6rem;
  color: #fff;
  line-height: 0.8rem;
  position: relative;
}
.menu_bar .menu_bar_item .hide_box {
  position: absolute;
  top: 101%;
  left: -0.3rem;
  width: 1.36rem;
  height: 1.29rem;
  background-color: #fff;
  text-align: center;
  font-weight: 400;
  font-size: 0.16rem;
  color: #686868;
  line-height: 0.36rem;
  padding-top: 0.1rem;
  display: none;
}
.menu_bar .menu_bar_item a img {
  margin-top: 0.29rem;
  width: 0.22rem;
  height: 0.22rem;
}
.aircraft {
  font-size: 0.5rem;
  color: #ffffff;
  display: flex;
  justify-content: center;
  margin-top: 1.81rem;
  margin-bottom: 2.07rem;
}
.product_list {
  height: 0.66rem;
  background-color: #191818;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  opacity: 0.4;
  color: #fff;
}
.product_list .product_introduce {
  display: flex;
  font-size: 0.2rem;
  margin-top: 0.32rem;
  height: 0.66rem;
}
.product_introduce p {
  font-size: 0.2rem;
}
.product_introduce :nth-child(1) a {
  margin-left: 0.37rem;
}
.product_list .location {
  margin-right: 0.5rem;
  font-size: 0.16rem;
}
.product_introduce span {
  margin: 0 0.4rem;
  width: 0.01rem;
  height: 0.4rem;
  background-color: #fff;
}
.title {
  border-bottom: 0.01rem solid #d4dee2;
}
.title h4 {
  font-weight: 400;
  font-size: 0.34rem;
  color: #333333;
  text-align: center;
  margin-top: 0.89rem;
  margin-bottom: 0.45rem;
}
.title p {
  font-size: 0.12rem;
  color: #333333;
  text-align: center;
  margin-bottom: 0.6rem;
}
.video_bottom{
  display: flex;
  justify-content: space-between;
}

.arrows {
  width: 1.22rem;
  height: 0.38rem;
  border: 0.01rem solid #333333;
  border-radius: 0.31rem 0.31rem 0.31rem 0.31rem;
  display: flex;
  align-items: center;
  justify-content: center;
  column-gap: 0.1rem;
  transition: var(--s_tran);
  margin-top: 0.83rem;
  margin-bottom: 1.2rem;
}
.arrows img {
  margin-left: 0rem;
  width: 0.12rem;
  height: 0.12rem;
  object-fit: contain;
  transition: var(--s_tran);
  
}
.arrows span {
  /* margin-left: 0.18rem; */
  font-size: 0.16rem;
  transition: var(--s_tran);
}
.arrows:hover{
  background: #000000;
}
.arrows:hover span{
  color:#fff;
}
.arrows:hover img{
  filter: grayscale(0) invert(1 );
}




@media screen and (max-width:1024px){
    .navigation{
        height: 3rem;
    }
    .product_list{
        display: none;
    }
    .title{
        width: 100%!important;
        padding: 15px;
        margin: 0;
        flex-direction: column;
    }
    .title h4{
        font-size: 16px;
    }
    .title p{
        font-size: 14px;
    }
    iframe{
        width: 100%!important;
        height: auto!important;
    }
    .arrows{
        width: fit-content;
        height: auto;
        padding: 5px 10px;
    }
}