/* 主菜单项样式 */
li {
    position: relative;
    list-style: none;
}

/* 主菜单链接样式 */
li > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    text-decoration: none;
    color: #333;
    cursor: pointer;
}

/* 子菜单容器 */
li > ul {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-radius: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    padding: 8px 0;
}

/* 鼠标悬停时显示子菜单 */
li:hover > ul {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 子菜单项样式 */
.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    color: #333;
    text-decoration: none;
    transition: background 0.2s ease;
}

/* 子菜单项悬停效果 */
.dropdown-item:hover {
    background: #f5f5f5;
}