.fixed-top {
    z-index: 99;
    position: fixed;
    width: 100vw;
}

header {
    background: var(--color-head-bg);
    top: 0;
    left: 0;
    right: 0;
}

.header-logo {
    padding: 35px 0 40px;
}

/* 媒体查询 */
@media (max-width: 768px) {
    .header-logo {
        padding: 10px;
    }
}

.header-logo img {
    width: auto;
    height: 80px;
    max-width: 80vw;
}

.yuanxun {
    width: 100%;
    height: 100%;
    /* 居右，顶部抬高20px */
    background-position: center top -10px;
    background-image: url("../images/mubiao.png");
    background-size: 90%;
    background-repeat: no-repeat;
}

.yuanxun h4 {
    padding-top: 80px;
    font-size: 18px;
    color: #cccccc;
    /* 添加阴影效果 */
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.header-function {
    display: flex;
    justify-content: right;
    flex-wrap: wrap;
    padding-top: 15px;
}

.header-link {
    position: relative;
    width: 100%;
    line-height: 30px;
    color: #fff;
    text-align: right;
    margin: 0 20px 0 0;
}

.header-link ul {
    position: relative;
    display: flex;
    justify-content: right;
}

.header-link li {
    margin-right: 0;
}

.header-link li:last-child {
    margin-right: 0;
}

.header-link li a {
    display: block;
    height: 34px;
    line-height: 34px;
    padding-left: 10px;
    color: #fff;
    transition: all .3s ease;
}

.header-link li a:hover {
    opacity: .6;
}

.header-link li img {
    margin-right: 6px;
    vertical-align: middle;
}

.header-search {
    position: absolute;
    max-width: 260px;
    width: 100%;
    height: 35px;
    top: 41px;
    right: 0;
    z-index: 8;
}

.header-search input {
    position: absolute;
    top: 0;
    left: 0;
    /*display: none;*/
    padding: 0 10px;
    width: 220px;
    height: 100%;
    border: 1px solid transparent;
    border-radius: 3px;
    background-color: var(--bs-light);
    color: black;
    font-size: 14px;
    line-height: 35px;
    transition: .3s all ease;
}

.header-search button {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 35px;
    border: 0;
    border-radius: 0;
    background: url(../images/icon_search.png) no-repeat center;
    transition: .3s all ease;
    z-index: 9;
}

header .row div:nth-child(2) {
    position: relative;
}