/* 侧边栏遮罩 */
.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 侧边栏菜单 */
.drawer-container {
    position: fixed;
    background: white;
    z-index: 1000;
    box-shadow: 5px 0 25px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    overflow-y: auto;
}