/* 侧边栏 */
.sidebar {
    width: 260px;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    height: fit-content;
    position: sticky;
    top: 5rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-lg);
    user-select: none;
}

.nav-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-10);
    color: var(--primary-color);
    font-weight: 600;
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 1.1em;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-nav {
        flex-direction: row;
        overflow-x: auto;
        padding: 0 1rem;
    }
}