.app {
    display: flex;
    height: 100vh;
    width: 100%;
    position: relative;
}

/* 侧边栏基础尺寸 */
.sidebar {
    width: 280px;
    background: #ffffff;
    border-right: 1px solid #eef2f6;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.08);
    overflow-y: auto;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    z-index: 200;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #f8fafc;
    width: 100%;
}

.scrollable-content {
    flex: 1;
    overflow-y: auto;
    padding: 28px 24px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 99;
    backdrop-filter: blur(2px);
}
.sidebar-overlay.active {
    display: block;
}