/* 用户头像占位符样式 - 确保文字居中 */
.user-avatar-placeholder {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: rgb(40, 111, 180);
    color: white;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    flex-shrink: 0;
    line-height: 1;
    vertical-align: middle;
}

/* 下拉菜单中的头像占位符 */
.user-dropdown-header .avatar-placeholder {
    width: 50px;
    height: 50px;
    font-size: 22px;
    line-height: 1;
}