/* Sidebar */
#sidebar {
    width: 250px;
    background-color: var(--surface);
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: transform 0.3s ease-in-out;
}

#sidebar.hidden {
    display: none;
}

/* Sidebar Navigation */
.sidebar-nav {
    padding: 1.5rem 0;
}

.sidebar-nav h3 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 1rem;
    margin-bottom: 0.5rem;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin: 0.25rem 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: all 0.15s ease-in-out;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--surface-hover);
    border-left-color: var(--text-muted);
}

.nav-link.active {
    color: var(--text-primary);
    background-color: var(--surface-hover);
    border-left-color: var(--accent-blue);
    font-weight: 500;
}

.nav-icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    #sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}