.header{
    background-color: #ffffff;
    position:sticky;
    top:0;
    font-size: 17px;
    z-index: 100;
}

.header-logo{
    font-size: 0;
    width: 110px;
    height: 110px;  
    margin-right: 40px;
    background: url("../imgs/公司LOGO矢量2.png")no-repeat center/contain;
}

.header-nav a{
    padding-left: 40px;
    line-height: 110px;
}

.header-nav > a {
    padding-left: 40px;
    line-height: 110px;
}

.header-search{ 
    margin-left: auto;
    font-weight: bold;
    cursor: pointer;
    line-height: 110px;
} 

.header-search:hover{
    color: #7f8185;
}

/* 下拉菜单样式 */
.nav-item-dropdown {
    position: relative;
    display: inline-block;
    vertical-align: top;
    padding: 0 10px;
}

.nav-item-dropdown:hover .dropdown-menu {
    display: block;
}

.nav-item-dropdown > a {
    display: block;
    line-height: 110px;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-30%);
    background-color: #fff;
    white-space: nowrap;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    z-index: 1;
    padding: 5px 0;    
}

.dropdown-item, a.dropdown-item {
    padding: 5px 15px;
    color: #333;
    text-decoration: none;
    display: block;
    text-align: center;
    transition: background-color 0.3s;
    font-size: 16px;
    line-height: 2;
}

.dropdown-item:hover, a.dropdown-item:hover {
    background-color: #f5f5f5;
}

/* 搜索框样式 */
.search-container {
    display: flex;
    align-items: center;
    margin-left: auto;
    position: relative;
}

.search-input {
    width: 0;
    padding: 8px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    outline: none;
    transition: width 0.3s ease-in-out;
    font-size: 14px;
}

.search-input:focus {
    width: 200px;
}

.header-search {
    line-height: normal;
    margin-left: 5px;
}