/* Main layout */
.main {
    display: flex;
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    gap: 1.5rem;
    padding: 1.5rem;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 1.5rem;
}

.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

/* Navigation */
.nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-button {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
    color: var(--gray-600);
    text-align: left;
}

.nav-button:hover {
    background-color: var(--gray-100);
    color: var(--gray-900);
}

.nav-button.active {
    background-color: var(--primary-color);
    color: white;
}

.collection-filter-panel,
.collection-action-panel,
.collection-content-panel {
    display: none;
}

.collection-filter-panel.active,
.collection-action-panel.active,
.collection-content-panel.active {
    display: block;
}