/* ========== Cluster Sub-Navigation ========== */
.cluster-sub-nav {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    border: 1px solid var(--border-color);
}

.cluster-sub-tab {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.cluster-sub-tab:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.cluster-sub-tab.active {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.cluster-sub-pane {
    display: none;
    animation: pageFadeIn 0.3s ease;
}

.cluster-sub-pane.active {
    display: block;
}

/* ========== Cluster Engine Grid ========== */
.cluster-engine-grid {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: var(--spacing-xl);
}

/* ========== Cluster Detail List ========== */
.cluster-detail-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.cluster-detail-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.cluster-detail-item:hover {
    background: var(--bg-hover);
}

.cluster-detail-color {
    width: 16px;
    height: 16px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    margin-top: 3px;
}

.cluster-detail-info {
    flex: 1;
}

.cluster-detail-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.cluster-detail-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.cluster-detail-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.cluster-detail-keyword {
    padding: 1px 8px;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    background: rgba(102, 126, 234, 0.15);
    color: var(--color-primary-light);
}

.cluster-noise-item .cluster-detail-color {
    background: #64748b !important;
}

.cluster-noise-item .cluster-detail-name {
    color: var(--text-muted);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .cluster-engine-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .cluster-sub-nav {
        flex-direction: column;
    }
}