/* ================== 用户菜单容器 ================== */
.user-menu { position: relative; display: inline-block; cursor: pointer; } 
/* 用户名样式 */
.user-name { padding: 6px 10px; border-radius: 4px; } 
.user-name:hover { background: #cae0dd; }
/* 连接桥（防止断层） */
.user-menu::after { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 15px; /* 连接高度 */ background: transparent; }
/* 下拉菜单 */
.user-dropdown { display: none; position: absolute; right: 0; top: calc(100% + 15px);   /* 正好在桥下面 */
    background: white; border: 1px solid #ddd; border-radius: 6px; min-width: 120px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); z-index: 999; }
/* 下拉菜单的链接 */
.user-dropdown a { display: block; padding: 8px 14px; color: #333; text-decoration: none; font-size: 14px; }
.user-dropdown a:hover { background: #f5f5f5; }
/* hover 显示 */
.user-menu:hover .user-dropdown { display: block; }