/**
 * Nexus Engine Cards - Light Theme
 * 
 * Enterprise-grade styling for NexusAI analytics engine results.
 * Designed to match vox-amelior.css light theme with premium aesthetics.
 * 
 * @author NemoServer Team
 * @version 2.0.0
 */

/* ============================================================================
   CSS Custom Properties - Light Theme Palette
   ============================================================================ */
:root {
    /* Primary colors from vox-amelior */
    --nexus-primary: #02559E;
    --nexus-primary-light: #2B7FD4;
    --nexus-primary-dark: #003D73;
    --nexus-primary-subtle: rgba(2, 85, 158, 0.08);
    --nexus-primary-glow: rgba(43, 127, 212, 0.15);

    /* Text colors - DARK for readability on light backgrounds */
    --nexus-text-primary: #1E293B;
    --nexus-text-secondary: #475569;
    --nexus-text-muted: #64748B;
    --nexus-text-light: #94A3B8;

    /* Background colors */
    --nexus-bg-card: #FFFFFF;
    --nexus-bg-card-hover: #F8FAFC;
    --nexus-bg-surface: #F1F5F9;
    --nexus-bg-accent: rgba(2, 85, 158, 0.04);

    /* Border colors */
    --nexus-border: #E2E8F0;
    --nexus-border-hover: #CBD5E1;
    --nexus-border-focus: #2B7FD4;

    /* Status colors */
    --nexus-success: #10B981;
    --nexus-success-bg: rgba(16, 185, 129, 0.1);
    --nexus-warning: #F59E0B;
    --nexus-warning-bg: rgba(245, 158, 11, 0.1);
    --nexus-error: #EF4444;
    --nexus-error-bg: rgba(239, 68, 68, 0.1);
    --nexus-info: #3B82F6;
    --nexus-info-bg: rgba(59, 130, 246, 0.1);

    /* Shadows */
    --nexus-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --nexus-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --nexus-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Transitions */
    --nexus-transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================================
   Engine Result Cards - Core Styling
   ============================================================================ */
.engine-result-card {
    background: var(--nexus-bg-card);
    border: 1px solid var(--nexus-border);
    border-radius: 14px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: all var(--nexus-transition);
    box-shadow: var(--nexus-shadow-sm);
}

.engine-result-card:hover {
    border-color: var(--nexus-border-hover);
    box-shadow: var(--nexus-shadow-md);
}

.engine-result-card.expanded {
    box-shadow: var(--nexus-shadow-lg);
    border-color: var(--nexus-primary-light);
}

/* ============================================================================
   Engine Card Header
   ============================================================================ */
.engine-card-header {
    padding: 16px 20px;
    background: var(--nexus-bg-surface);
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
    transition: background var(--nexus-transition);
    border-bottom: 1px solid transparent;
}

.engine-card-header:hover {
    background: var(--nexus-bg-card-hover);
}

.engine-result-card.expanded .engine-card-header {
    border-bottom-color: var(--nexus-border);
}

.engine-icon {
    font-size: 1.8rem;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.engine-card-header h3 {
    flex: 1;
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--nexus-text-primary);
    letter-spacing: -0.01em;
}

/* ============================================================================
   Status Badges
   ============================================================================ */
.engine-status {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.engine-status.pending {
    background: var(--nexus-bg-surface);
    color: var(--nexus-text-muted);
    border: 1px solid var(--nexus-border);
}

.engine-status.running {
    background: var(--nexus-warning-bg);
    color: #B45309;
    border: 1px solid rgba(245, 158, 11, 0.3);
    animation: statusPulse 2s infinite;
}

@keyframes statusPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.engine-status.success {
    background: var(--nexus-success-bg);
    color: #047857;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.engine-status.error {
    background: var(--nexus-error-bg);
    color: #B91C1C;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.engine-status.fallback {
    background: var(--nexus-warning-bg);
    color: #B45309;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ============================================================================
   Engine Card Body - Expandable Content
   ============================================================================ */
.engine-card-body {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    background: var(--nexus-bg-card);
}

.engine-result-card.expanded .engine-card-body {
    max-height: 4000px;
    padding: 20px;
}

/* ============================================================================
   Gemma Summary - Dark Chat Bubble Style (matches gemma.html)
   ============================================================================ */
.gemma-summary {
    background: rgba(15, 23, 42, 0.95);
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    margin-bottom: 1.25rem;
    border: 1px solid rgba(148, 163, 184, 0.15);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    max-width: 90%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.gemma-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.gemma-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.gemma-chat-inline {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(148, 163, 184, 0.15);
}

.gemma-chat-inline input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 0.5rem;
    color: #e2e8f0;
    font-size: 0.875rem;
    font-family: inherit;
}

.gemma-chat-inline input::placeholder {
    color: rgba(148, 163, 184, 0.6);
}

.gemma-chat-inline input:focus {
    outline: none;
    border-color: rgba(99, 102, 241, 0.5);
}

.gemma-chat-inline button {
    padding: 0.5rem 1rem;
    background: #6366f1;
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background 0.2s;
}

.gemma-chat-inline button:hover {
    background: #4f46e5;
}

.followup-messages {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 160px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.followup-msg {
    font-size: 0.85rem;
    line-height: 1.4;
    color: #e2e8f0;
}

.followup-msg.user .msg-label {
    color: #cbd5f5;
    font-weight: 600;
    margin-right: 0.25rem;
}

.followup-msg.assistant .msg-label {
    color: #67e8f9;
    font-weight: 600;
    margin-right: 0.25rem;
}

.gemma-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.gemma-text {
    color: #e2e8f0;
    line-height: 1.7;
    font-size: 0.95rem;
    flex: 1;
}

.gemma-text strong {
    color: #67e8f9;
    font-weight: 600;
}

.gemma-text p {
    margin: 0 0 0.75em 0;
    color: #e2e8f0;
}

.gemma-text p:last-child {
    margin-bottom: 0;
}

.gemma-text ul,
.gemma-text ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
    color: #e2e8f0;
}

.gemma-text li {
    margin: 0.25em 0;
    color: #e2e8f0;
}

.gemma-text code {
    background: rgba(6, 182, 212, 0.2);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.9em;
    color: #67e8f9;
}

/* ============================================================================
   Engine Meta Information
   ============================================================================ */
.engine-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--nexus-border);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--nexus-text-muted);
}

/* ============================================================================
   Key Findings Section
   ============================================================================ */
.key-findings {
    background: var(--nexus-bg-surface);
    padding: 16px 20px;
    border-radius: 10px;
    margin-bottom: 16px;
}

.key-findings h4 {
    margin: 0 0 12px 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--nexus-text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.key-findings ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.key-findings li {
    padding: 8px 0;
    border-bottom: 1px solid var(--nexus-border);
    color: var(--nexus-text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.key-findings li:last-child {
    border-bottom: none;
}

.key-findings li::before {
    content: ">";
    color: var(--nexus-primary);
    font-weight: 600;
    flex-shrink: 0;
}

/* ============================================================================
   Raw Data Section
   ============================================================================ */
.raw-data-section {
    margin-top: 16px;
}

.toggle-raw-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--nexus-bg-surface);
    border: 1px solid var(--nexus-border);
    border-radius: 8px;
    color: var(--nexus-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--nexus-transition);
}

.toggle-raw-btn:hover {
    background: var(--nexus-bg-card-hover);
    border-color: var(--nexus-border-hover);
    color: var(--nexus-text-primary);
}

.raw-data {
    background: var(--nexus-bg-surface);
    padding: 16px;
    border-radius: 8px;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--nexus-text-secondary);
    overflow-x: auto;
    max-height: 300px;
    overflow-y: auto;
    font-family: 'IBM Plex Mono', monospace;
    border: 1px solid var(--nexus-border);
}

/* ============================================================================
   Chat Input Section
   ============================================================================ */
.engine-chat-input {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--nexus-border);
}

.engine-chat-input input {
    flex: 1;
    padding: 10px 14px;
    background: var(--nexus-bg-surface);
    border: 1px solid var(--nexus-border);
    border-radius: 8px;
    color: var(--nexus-text-primary);
    font-size: 0.9rem;
    transition: all var(--nexus-transition);
}

.engine-chat-input input::placeholder {
    color: var(--nexus-text-light);
}

.engine-chat-input input:focus {
    outline: none;
    border-color: var(--nexus-primary-light);
    box-shadow: 0 0 0 3px var(--nexus-primary-glow);
}

.engine-chat-input button {
    padding: 10px 16px;
    background: var(--nexus-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--nexus-transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.engine-chat-input button:hover {
    background: var(--nexus-primary-dark);
    transform: translateY(-1px);
}

/* ============================================================================
   Follow-up Question Section (Chat per engine card)
   ============================================================================ */
.followup-section {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--nexus-border);
}

.followup-messages {
    min-height: 0;
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 0.75rem;
}

.followup-msg {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.followup-msg.user {
    background: var(--nexus-primary);
    color: white;
    margin-left: 2rem;
}

.followup-msg.assistant {
    background: rgba(15, 23, 42, 0.9);
    color: #e2e8f0;
    margin-right: 2rem;
    border: 1px solid rgba(148, 163, 184, 0.15);
}

.followup-input {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.followup-input input {
    flex: 1;
    padding: 0.65rem 1rem;
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 0.5rem;
    color: #e2e8f0;
    font-size: 0.9rem;
    font-family: inherit;
    transition: all 0.2s ease;
}

.followup-input input::placeholder {
    color: rgba(148, 163, 184, 0.6);
}

.followup-input input:focus {
    outline: none;
    border-color: var(--nexus-primary);
    box-shadow: 0 0 0 3px rgba(2, 85, 158, 0.15);
}

.followup-input button {
    padding: 0.65rem 1.25rem;
    background: var(--nexus-primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.followup-input button:hover {
    background: var(--nexus-primary-dark);
    transform: translateY(-1px);
}

/* ============================================================================
   Loading Spinner
   ============================================================================ */
.loading-spinner {
    text-align: center;
    color: var(--nexus-text-muted);
    padding: 20px;
    font-style: italic;
}

/* ============================================================================
   Error State
   ============================================================================ */
.engine-error {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--nexus-error-bg);
    border-radius: 10px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.error-icon {
    font-size: 1.5rem;
}

.error-message {
    color: #B91C1C;
    font-size: 0.9rem;
    line-height: 1.5;
}

/* ============================================================================
   Engine Category Tabs
   ============================================================================ */
.engine-category-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    padding: 4px;
    background: var(--nexus-bg-surface);
    border-radius: 12px;
}

.engine-category-btn {
    padding: 10px 18px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--nexus-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--nexus-transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.engine-category-btn:hover {
    background: var(--nexus-bg-card);
    color: var(--nexus-text-primary);
}

.engine-category-btn.active {
    background: var(--nexus-bg-card);
    color: var(--nexus-primary);
    box-shadow: var(--nexus-shadow-sm);
    font-weight: 600;
}

.engine-category-btn .count {
    background: var(--nexus-primary-subtle);
    color: var(--nexus-primary);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ============================================================================
   Engine Category Content
   ============================================================================ */
.engine-category-content {
    display: none;
}

.engine-category-content.active {
    display: block;
}

.engine-category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--nexus-border);
}

.engine-category-header h4 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--nexus-text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.engine-category-stats {
    display: flex;
    gap: 12px;
}

.engine-category-stats .stat {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
}

.engine-category-stats .stat.success {
    background: var(--nexus-success-bg);
    color: #047857;
}

.engine-category-stats .stat.error {
    background: var(--nexus-error-bg);
    color: #B91C1C;
}

.engine-category-stats .stat.pending {
    background: var(--nexus-bg-surface);
    color: var(--nexus-text-muted);
}

/* ============================================================================
   Charts Container
   ============================================================================ */
.engine-chart-container {
    background: var(--nexus-bg-surface);
    border-radius: 10px;
    padding: 16px;
    margin: 16px 0;
    border: 1px solid var(--nexus-border);
}

.engine-chart-container canvas {
    max-height: 200px;
}

/* ============================================================================
   Run Navigation (Multi-Run Support)
   ============================================================================ */
.run-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    padding-left: 12px;
}

.run-nav button {
    height: 28px;
    border-radius: 6px;
    border: 1px solid var(--nexus-border);
    background: var(--nexus-bg-card);
    color: var(--nexus-text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--nexus-transition);
    padding: 0 8px;
}

.run-nav button:hover:not(:disabled) {
    background: var(--nexus-bg-surface);
    border-color: var(--nexus-primary-light);
    color: var(--nexus-primary);
}

.run-nav button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.run-nav .run-counter {
    font-size: 0.8rem;
    color: var(--nexus-primary);
    font-weight: 600;
    min-width: 50px;
    text-align: center;
    padding: 5px 12px;
    background: var(--nexus-primary-subtle);
    border: 1px solid rgba(2, 85, 158, 0.2);
    border-radius: 14px;
}

/* ============================================================================
   Responsive Design
   ============================================================================ */
/* ============================================================================
   MOBILE RESPONSIVE - Comprehensive Fixes (768px and below)
   ============================================================================ */
@media (max-width: 768px) {

    /* Engine Card Header - Prevent crowding */
    .engine-card-header {
        padding: 12px 14px;
        flex-wrap: wrap;
        gap: 10px;
    }

    .engine-card-header h3 {
        font-size: 0.95rem;
        flex: 1 1 100%;
        order: 1;
    }

    .engine-icon {
        font-size: 1.5rem;
        min-width: 32px;
        order: 0;
    }

    .engine-status {
        font-size: 0.7rem;
        padding: 4px 10px;
        order: 2;
        margin-left: auto;
    }

    /* Gemma Summary - FIX TEXT OVERFLOW */
    .gemma-summary {
        flex-direction: column;
        gap: 10px;
        max-width: 100%;
        padding: 0.875rem 1rem;
        margin-bottom: 1rem;
    }

    .gemma-text {
        word-break: break-word;
        overflow-wrap: break-word;
        hyphens: auto;
        font-size: 0.875rem;
        line-height: 1.6;
    }

    .gemma-text p,
    .gemma-text li {
        word-break: break-word;
        overflow-wrap: break-word;
    }

    .gemma-content {
        width: 100%;
        min-width: 0;
    }

    .gemma-icon {
        font-size: 1.25rem;
    }

    /* Engine Category Tabs - Stack vertically */
    .engine-category-tabs {
        flex-direction: column;
        gap: 6px;
    }

    .engine-category-btn {
        justify-content: center;
        min-height: 44px;
        font-size: 0.85rem;
    }

    /* Engine Card Body - Better spacing */
    .engine-result-card.expanded .engine-card-body {
        padding: 16px 14px;
    }

    /* Key Findings - Mobile friendly */
    .key-findings {
        padding: 12px 14px;
    }

    .key-findings li {
        font-size: 0.85rem;
        padding: 6px 0;
    }

    /* Engine Meta - Wrap properly */
    .engine-meta {
        gap: 8px;
        flex-wrap: wrap;
    }

    .meta-item {
        font-size: 0.8rem;
    }

    /* Follow-up Section - Mobile layout */
    .followup-input {
        flex-direction: column;
        gap: 8px;
    }

    .followup-input input {
        width: 100%;
    }

    .followup-input button {
        width: 100%;
        min-height: 44px;
    }

    .followup-msg.user,
    .followup-msg.assistant {
        margin-left: 0;
        margin-right: 0;
    }

    /* Chart Containers - Horizontal scroll */
    .engine-viz-section {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .waterfall-container,
    .cluster-3d-container,
    .anomaly-chart-container,
    .boxplot-container,
    .fin-chart-container {
        min-width: 320px;
        height: 260px;
    }

    .scatter-3d-container,
    .anomaly-dist-container,
    .correlation-heatmap-container,
    .line-chart-container,
    .heatmap-container {
        min-width: 320px;
        height: 280px;
    }

    .fin-chart-container-lg,
    .fin-chart-container-xl {
        min-width: 360px;
        height: 320px;
    }

    .viz-container {
        min-width: 300px;
        height: 220px;
    }

    /* Visualization Grid - Stack on mobile */
    .engine-viz-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .engine-viz-card {
        min-height: 200px;
    }

    /* Metric Cards - 2 column on mobile */
    .metric-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .metric-card {
        padding: 0.6rem;
    }

    .metric-card .metric-value {
        font-size: 1.2rem;
    }

    .metric-card .metric-label {
        font-size: 0.65rem;
    }

    /* Clustering Layout - Stack */
    .clustering-layout {
        grid-template-columns: 1fr;
    }

    .clustering-sidebar {
        max-height: 300px;
    }

    /* Raw Data Section */
    .raw-data {
        font-size: 0.7rem;
        max-height: 200px;
    }

    .toggle-raw-btn {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
}

/* ============================================================================
   SMALL MOBILE - Extra small screens (480px and below)
   ============================================================================ */
@media (max-width: 480px) {
    .engine-card-header {
        padding: 10px 12px;
    }

    .engine-card-header h3 {
        font-size: 0.9rem;
    }

    .engine-status {
        font-size: 0.65rem;
        padding: 3px 8px;
    }

    .gemma-summary {
        padding: 0.75rem;
    }

    .gemma-text {
        font-size: 0.8rem;
        line-height: 1.55;
    }

    .engine-result-card.expanded .engine-card-body {
        padding: 12px 10px;
    }

    .key-findings {
        padding: 10px 12px;
    }

    .key-findings h4 {
        font-size: 0.85rem;
    }

    .key-findings li {
        font-size: 0.8rem;
    }

    /* Single column for metric cards */
    .metric-cards {
        grid-template-columns: 1fr 1fr;
    }

    .metric-card .metric-value {
        font-size: 1rem;
    }

    /* Chart containers smaller but scrollable */
    .waterfall-container,
    .cluster-3d-container,
    .anomaly-chart-container,
    .boxplot-container,
    .fin-chart-container {
        min-width: 280px;
        height: 220px;
    }

    .viz-container {
        min-width: 260px;
        height: 180px;
    }
}

/* ============================================================================
   Engine Visualization Sections
   ============================================================================ */
.engine-viz-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--nexus-border);
}

.engine-viz-section h5 {
    margin: 0 0 1rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--nexus-text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.engine-viz-section h5::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1em;
    background: var(--nexus-primary);
    border-radius: 2px;
}

.waterfall-container,
.cluster-3d-container,
.anomaly-chart-container,
.boxplot-container,
.fin-chart-container {
    height: 300px;
    background: var(--nexus-bg-surface);
    border-radius: 10px;
    border: 1px solid var(--nexus-border);
    overflow: hidden;
    position: relative;
}

.fin-viz-premium {
    padding: 1rem;
    background: linear-gradient(135deg, var(--nexus-bg-surface), var(--nexus-bg-card));
    border-radius: 12px;
    border: 1px solid var(--nexus-border);
}

.fin-grid {
    display: grid;
    gap: 1rem;
}

.fin-gap-md {
    gap: 1rem;
}

.fin-grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
    .fin-grid-2 {
        grid-template-columns: 1fr;
    }
}

.fin-chart-container-lg {
    height: 400px;
    background: var(--nexus-bg-surface);
    border-radius: 10px;
    border: 1px solid var(--nexus-border);
    position: relative;
}

.fin-chart-container-xl {
    height: 450px;
    background: var(--nexus-bg-surface);
    border-radius: 10px;
    border: 1px solid var(--nexus-border);
    position: relative;
}

/* ============================================================================
   Visualization Grid + Cards
   ============================================================================ */
.engine-viz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.engine-viz-card {
    background: var(--nexus-bg-surface);
    border: 1px solid var(--nexus-border);
    border-radius: 12px;
    padding: 0.75rem 0.75rem 0.5rem;
    min-height: 220px;
    position: relative;
}

.engine-viz-card .chart-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--nexus-text-secondary);
    margin: 0 0 0.5rem 0;
}

.viz-container {
    height: 260px;
    border-radius: 10px;
    background: #ffffff;
    border: 1px solid var(--nexus-border);
    overflow: hidden;
    position: relative;
}

.viz-container.viz-tall {
    height: 340px;
}

.viz-container.viz-short {
    height: 200px;
}

.scatter-3d-container,
.anomaly-dist-container,
.correlation-heatmap-container,
.line-chart-container,
.heatmap-container {
    height: 320px;
    border-radius: 10px;
    background: #ffffff;
    border: 1px solid var(--nexus-border);
    overflow: hidden;
}

/* ============================================================================
   Metric Cards
   ============================================================================ */
.metric-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
}

.metric-card {
    background: #ffffff;
    border: 1px solid var(--nexus-border);
    border-radius: 10px;
    padding: 0.75rem;
    text-align: center;
    box-shadow: var(--nexus-shadow-sm);
}

.metric-card .metric-value {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--nexus-primary);
}

.metric-card .metric-label {
    font-size: 0.7rem;
    color: var(--nexus-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 0.25rem;
}

/* ============================================================================
   Text Summary Blocks
   ============================================================================ */
.text-summary-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--nexus-text-secondary);
}

.text-summary-item {
    padding: 0.6rem 0.75rem;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid var(--nexus-border);
}

/* ============================================================================
   Clustering Layout
   ============================================================================ */
.clustering-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 1rem;
}

@media (max-width: 1024px) {
    .clustering-layout {
        grid-template-columns: 1fr;
    }
}

.clustering-sidebar {
    background: #ffffff;
    border: 1px solid var(--nexus-border);
    border-radius: 12px;
    padding: 0.75rem;
    max-height: 420px;
    overflow: auto;
}

.cluster-cards-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cluster-card {
    border: 1px solid var(--nexus-border);
    border-radius: 10px;
    padding: 0.6rem;
    background: var(--nexus-bg-card);
    transition: border-color var(--nexus-transition), box-shadow var(--nexus-transition);
}

.cluster-card:hover {
    border-color: var(--nexus-primary-light);
    box-shadow: var(--nexus-shadow-sm);
}

.cluster-card.selected {
    border-color: var(--nexus-primary);
    box-shadow: 0 0 12px rgba(2, 85, 158, 0.2);
    background: rgba(2, 85, 158, 0.08);
}

.cluster-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.cluster-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.45rem;
    border-radius: 6px;
    background: var(--nexus-primary-subtle);
    color: var(--nexus-primary-dark);
}

.cluster-size {
    font-size: 0.7rem;
    color: var(--nexus-text-muted);
}

.cluster-stats {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-size: 0.72rem;
    color: var(--nexus-text-secondary);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
}

.stat-name {
    color: var(--nexus-text-muted);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.stat-value {
    color: var(--nexus-text-secondary);
    font-family: 'Monaco', 'Menlo', monospace;
}

.stat-more {
    font-size: 0.7rem;
    color: var(--nexus-primary);
    font-style: italic;
    margin-top: 0.2rem;
}

.pca-explanation {
    margin-top: 0.75rem;
    padding: 0.6rem;
    border-radius: 10px;
    background: var(--nexus-bg-surface);
    border: 1px solid var(--nexus-border);
}

.pca-explanation h6 {
    margin: 0 0 0.5rem;
    font-size: 0.8rem;
    color: var(--nexus-primary);
}

.pca-components {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.pca-component {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.8rem;
    color: var(--nexus-text-secondary);
}

.pc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.pc-variance {
    font-size: 0.7rem;
    color: var(--nexus-primary-dark);
    background: rgba(2, 85, 158, 0.12);
    padding: 0.1rem 0.35rem;
    border-radius: 6px;
}

.pc-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.pc-feature {
    font-size: 0.7rem;
    padding: 0.2rem 0.35rem;
    border-radius: 6px;
    background: rgba(2, 85, 158, 0.08);
    color: var(--nexus-primary-dark);
}

.pc-feature.positive {
    background: rgba(16, 185, 129, 0.2);
    color: #0f766e;
}

.pc-feature.negative {
    background: rgba(239, 68, 68, 0.18);
    color: #b91c1c;
}

/* ============================================================================
   Demo Data + Error States
   ============================================================================ */
.demo-data-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(245, 158, 11, 0.2);
    color: #b45309;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 600;
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.demo-data-notice {
    padding: 1.5rem;
    text-align: center;
    color: var(--nexus-text-muted);
    font-size: 0.85rem;
}