/* 侧边栏样式 */
.sidebar {
    position: fixed;
    top: 0;
    left: -250px;
    width: 250px;
    height: 100%;
    background: var(--card-bg-light);
    backdrop-filter: blur(var(--blur-amount));
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    z-index: 999;
    overflow-y: auto;
    padding: 20px 16px;
    transition: transform 0.3s ease-out;
}

.dark-mode .sidebar {
    background: var(--card-bg-dark);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.sidebar-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary-light);
    cursor: pointer;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--card-radius);
    color: var(--text-primary-light);
    text-decoration: none;
    transition: var(--transition);
}

.dark-mode .sidebar-item {
    color: var(--text-primary-dark);
}

.sidebar-item:hover {
    background: rgba(10, 132, 255, 0.1);
    color: var(--system-blue);
}

.sidebar-icon {
    width: 20px;
    text-align: center;
    color: var(--system-blue);
}

/* 菜单遮罩 */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    z-index: 998;
    transition: all 0.3s ease-out;
}

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