<style type="text/css">
/* ===== 导航核心CSS（必须在一起）===== */

/* 1. 导航容器 */
.nav ul.fix {
    list-style: none;
    margin: 0 !important;
    padding: 0;
    display: flex;
    width: 100%;
}

.nav ul.fix > li {
    position: relative;
    float: left;
}


.nav ul.fix > li > a.v1 em {
    display: inline-block;
    margin-left: 5px;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #666;
}

/* 4. 关键：控制显示的逻辑 */
li.aboutbeiling .bexia {
    display: none !important;
}

/* 只允许JS控制的类显示 */
li.aboutbeiling.menu-open .bexia {
    display: block !important;
}

/* 6. 清除浮动 */
.nav:after {
    content: "";
    display: table;
    clear: both;
}



