@font-face {
    font-family: 'bt';
    src: url('../font/优设标题黑.ttf') format('woff');
    font-weight: normal;
    font-style: normal;
}
.header {
    background-color: #132017; 
    color: #eaeaea;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 80px;
}
.logo {
    display: flex;
    align-items: center; 
}
.logo img {
    height: 28px; /* Logo 图标高度 */
    margin-right: 10px; /* Logo 与品牌名称之间的间距 */
}
.brand-name {
    font-family: 'bt';
    font-size: 20px;
    font-weight: 100;
}
ul,li{
    padding: 0;
    margin: 0;
    list-style: none;
}
.box{
    width: 60%;
    display: flex;
    left: 40%; 
}
.nav{
    width: 900px;
    height: 6vh;
    margin-left: auto;
    display: flex;
}
.nav a{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: #eaeaea;
}
.nav>.item{
    width: 20%;
    height: 100%;
    position: relative;
    transform: .4s;
}
.list{
    position: absolute;
    top: 90%;
    width: 100%;
    overflow: hidden;
    max-height: 0px;
    transition: .4s;
    border-radius: 0 0 10px 10px;
    background-color: #132017;
    z-index: 1;
}
.itemTwo{
    height: 65px;
}
.nav>.item:hover{
    background-color: #32ab0a;
}
.nav>.item:hover>.list{
    max-height: 500px;
}
a{
    text-decoration: none;
}
.itemTwo:hover{
    background-color: #32ab0a;
}