.header {
    width: 100%;
    height: 0.9rem;
    background: #FFFFFF;
    box-shadow: 0rem 0.03rem 0.03rem 0.01rem rgba(0, 0, 0, 0.08);
    position: relative;
    z-index: 999;
    position: sticky;
    top: 0;
}
.header .main{
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header .logo{
    width: auto;
    height: 0.54rem;
}
.header .logo img{
    width: auto;
    max-height: 100%;
    object-fit: contain;
}
.header .head_fr{
    display: flex;
    height: 100%;
}
.header .head_fr .head_nav{
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 400;
    font-size: 0.18rem;
    color: #000000;
    margin: 0 0.31rem;
    cursor: pointer;
}
.header .head_fr .head_nav .nav_title{
    height: auto;
}
.header .head_fr .head_nav.act,
.header .head_fr .head_nav.header-nav-active{
    position: relative;
    color: #DC0017;
    font-weight: bold;
}
.header .head_fr .head_nav.act::after,
.header .head_fr .head_nav.header-nav-active::after{
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    width: 1.36rem;
    height: 100%;
    transform: translateX(-50%);
    background: url(../img/head_nav.png) center no-repeat;
    background-size: contain;
}
.header .head_fr .head_nav.act::before,
.header .head_fr .head_nav.header-nav-active::before{
    content: "";
    position: absolute;
    width: 0.36rem;
    height: 0.03rem;
    background: #DC0017;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
}
.header .head_fr .language{
    width: 1.4rem;
    justify-content: flex-start;
    margin-left: 0.38rem;
}
.header .head_fr .language .nav_title{
    width: 100%;
    font-weight: 400;
    font-size: 0.16rem;
    color: #555555;
    display: flex;
    align-items: center;
    position: relative;
}
.header .head_fr .language .nav_title::before{
    content: "";
    position: absolute;
    width: 0.14rem;
    height: 0.09rem;
    background: url(../img/head_icon.png) center no-repeat;
    background-size: contain;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
}
.header .head_fr .language .nav_title img{
    width: 0.24rem;
    height: auto;
    margin-right: 0.12rem;
}



.header .head_fr .head_nav .nav_class {
    position: fixed;
    width: 100%;
    top: 0.9rem;
    left: 0;
    background: #F7F7F7;
    transform: translateY(-20px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.header .head_fr .head_nav:hover .nav_class {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
 
.nav_class .nav_class_name{
    width: 16rem;
    margin: 0.43rem auto 0.29rem;
    font-weight: bold;
    font-size: 0.18rem;
    color: #000000;
}
.nav_class .nav_url{
    width: 16rem;
    margin: 0 auto 0.6rem;
    display: flex;
    gap: 1.1rem;
}
.nav_class .nav_url a{
    width: auto;
    height: auto;
    font-weight: 400;
    font-size: 0.18rem;
    color: #000000;
}
.nav_class .nav_url a:hover{
    color: #DC0017;
}







.nav_class .nav_product{
    width: 16rem;
    margin: 0.68rem auto 0.84rem;
    display: flex;
    justify-content: space-between;
}

.nav_class .nav_product .nav_txt{
    font-weight: bold !important;
    font-size: 0.18rem !important;
    color: #000000 !important;
    width: auto;
    height: auto;
}
.nav_class .nav_product .nav_list span{
    font-weight: bold;
    font-size: 0.18rem;
    color: #000000;
    display: block;
    margin-bottom: 0.43rem;
}
.nav_class .nav_product .nav_list a{
    width: auto;
    height: auto;
    font-weight: 400;
    font-size: 0.16rem;
    margin-bottom: 0.24rem;
    color: #555555;
}
.nav_class .nav_product .nav_list a:hover{
    color: #DC0017;
}








/* 左侧悬浮 */
.left_nav {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    text-align: -webkit-right;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    padding-right: 0.1rem;
}
.left_nav .left_item{
    min-width: 0.5rem;
    width: fit-content;
    height: 0.5rem;
    background: #346EC1;
    margin-bottom: 0.05rem;
    display: flex;
    align-items: center;
    padding: 0 0.12rem;
    box-sizing: border-box;
    cursor: pointer;
}
.left_nav .left_item.goTop{
    margin-top: 0.1rem;
}
.left_nav .left_item .left_img{
    width: 0.25rem;
    max-height: 0.25rem;
    object-fit: contain;
}
.left_nav .left_item span{
    font-weight: 400;
    font-size: 16px;
    color: #FFFFFF;
    white-space: nowrap;
    overflow: hidden;
    max-width: 0;
    opacity: 0;
    transition: all 0.5s ease;
}
.left_nav .left_item span b{
    font-weight: bold;
    font-size: 0.16rem;
    color: #FFFFFF;
}
.left_nav .left_item:hover span {
    max-width: 3.5rem;
    opacity: 1;
    margin-left: 10px;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.left_nav .left_item:hover {
    width: auto;
    background: #DC0017;
}