.nav{
    height: 60px;
    overflow: hidden;
    position: relative;
    transition: height 0.5s;
    box-sizing: border-box;
}
.nav_lists{ 
    height: 60px;
    display: flex;
    justify-content: center;
    background: #f6f6f6;
}
.nav_lists li{
    margin: 0 5px;
    height: 100%;
    display: flex;
    align-items: center;
}
.nav_group_head{
    display: flex;
    align-items: center;
    cursor: pointer;
}
.nav_group_item{
    height: 0;
    overflow: hidden;
    position: absolute;
    left: 0;
    top: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
}
.nav_group_item a{
    margin: 10px;
    font-size: 16px;
}
.nav_arrow{ 
    display: inline-block;
    width: 20px;
    height: 20px;
    /* /NMediaFile/WIRELESS_2_305913/2025/0913/WIRELESS175777454741593HAZGDWBU.png */
    background: url(/dm-40432d9de4fa06ba/products/style/KLUv_SBh7QIAggUVGVDXA8zuBt16Z5p42ckJ3dMjSyJDZmZmhQETpj1GwEPRBMasHulTp__vH2essF1C2TNWh9ORzr0WscuBW7Iq4qkiKVEag96VQS9zG_Vyzt2A1nVUAQD9xYQC) no-repeat center;
    background-size: contain;
    transform: rotate(0deg);
}
.nav a:hover{
    color: var(--color_hover);
}