/**
 * Educational Visual Component Engine - Design System
 * =====================================================
 * Modern, premium educational SaaS aesthetic
 * Inspired by Gamma/Beautiful.ai/Canva
 * 
 * WordPress Compatible | Export-Friendly | Responsive
 */

/* =====================================================
   CSS VARIABLES - THEME SYSTEM
   ===================================================== */
:root {
    /* Primary Brand Colors */
    --eai-primary: #1254B8;
    --eai-primary-light: #3B7DD8;
    --eai-primary-dark: #0A3A8A;
    
    /* Secondary Accent Colors */
    --eai-secondary: #29C6FF;
    --eai-secondary-light: #6AD9FF;
    --eai-secondary-dark: #0095D9;
    
    /* Dark Theme */
    --eai-dark: #0F2E5C;
    --eai-darker: #071B38;
    
    /* Surface Colors */
    --eai-surface: #FFFFFF;
    --eai-surface-alt: #F8FAFC;
    --eai-surface-elevated: #FFFFFF;
    --eai-border: rgba(15, 46, 92, 0.08);
    
    /* Text Colors */
    --eai-text-primary: #1E293B;
    --eai-text-secondary: #64748B;
    --eai-text-muted: #94A3B8;
    --eai-text-inverse: #FFFFFF;
    
    /* Semantic Colors */
    --eai-success: #10B981;
    --eai-warning: #F59E0B;
    --eai-error: #EF4444;
    --eai-info: #3B82F6;
    
    /* Subject Theme Colors (for variety) */
    --eai-math: #8B5CF6;
    --eai-science: #10B981;
    --eai-history: #F59E0B;
    --eai-english: #EC4899;
    --eai-geography: #06B6D4;
    --eai-computing: #6366F1;
    
    /* Spacing Scale */
    --eai-space-xs: 4px;
    --eai-space-sm: 8px;
    --eai-space-md: 16px;
    --eai-space-lg: 24px;
    --eai-space-xl: 32px;
    --eai-space-2xl: 48px;
    --eai-space-3xl: 64px;
    
    /* Border Radius */
    --eai-radius-sm: 8px;
    --eai-radius-md: 12px;
    --eai-radius-lg: 16px;
    --eai-radius-xl: 20px;
    --eai-radius-full: 9999px;
    
    /* Shadows */
    --eai-shadow-sm: 0 1px 2px 0 rgba(15, 46, 92, 0.05);
    --eai-shadow-md: 0 4px 6px -1px rgba(15, 46, 92, 0.08), 0 2px 4px -2px rgba(15, 46, 92, 0.04);
    --eai-shadow-lg: 0 10px 15px -3px rgba(15, 46, 92, 0.1), 0 4px 6px -4px rgba(15, 46, 92, 0.05);
    --eai-shadow-xl: 0 20px 25px -5px rgba(15, 46, 92, 0.12), 0 8px 10px -6px rgba(15, 46, 92, 0.04);
    --eai-shadow-glow: 0 0 20px rgba(41, 198, 255, 0.3);
    
    /* Typography */
    --eai-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --eai-font-heading: var(--eai-font-family);
    --eai-font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    /* Font Sizes */
    --eai-text-xs: 12px;
    --eai-text-sm: 14px;
    --eai-text-base: 16px;
    --eai-text-lg: 18px;
    --eai-text-xl: 20px;
    --eai-text-2xl: 24px;
    --eai-text-3xl: 30px;
    --eai-text-4xl: 36px;
    
    /* Font Weights */
    --eai-font-normal: 400;
    --eai-font-medium: 500;
    --eai-font-semibold: 600;
    --eai-font-bold: 700;
    --eai-font-extrabold: 800;
    
    /* Line Heights */
    --eai-leading-tight: 1.25;
    --eai-leading-normal: 1.5;
    --eai-leading-relaxed: 1.625;
    
    /* Transitions */
    --eai-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --eai-transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --eai-transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Animation */
    --eai-animate-duration: 400ms;
    --eai-animate-stagger: 80ms;
}

/* =====================================================
   BASE CONTAINER STYLES
   ===================================================== */
.eai-visual-container {
    font-family: var(--eai-font-family);
    color: var(--eai-text-primary);
    line-height: var(--eai-leading-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.eai-visual-container * {
    box-sizing: border-box;
}

/* =====================================================
   UNIVERSAL CARD COMPONENT
   ===================================================== */
.eai-card {
    background: var(--eai-surface-elevated);
    border-radius: var(--eai-radius-xl);
    box-shadow: var(--eai-shadow-md);
    padding: var(--eai-space-xl);
    transition: transform var(--eai-transition-normal), box-shadow var(--eai-transition-normal);
}

.eai-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--eai-shadow-lg);
}

.eai-card-header {
    margin-bottom: var(--eai-space-lg);
    padding-bottom: var(--eai-space-md);
    border-bottom: 1px solid rgba(15, 46, 92, 0.08);
}

.eai-card-title {
    font-family: var(--eai-font-heading);
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-sm) 0;
    line-height: var(--eai-leading-tight);
}

.eai-card-subtitle {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    margin: 0;
}

/* =====================================================
   TYPOGRAPHY UTILITIES
   ===================================================== */
.eai-title-xl {
    font-size: var(--eai-text-4xl);
    font-weight: var(--eai-font-extrabold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-lg) 0;
    line-height: var(--eai-leading-tight);
}

.eai-title-lg {
    font-size: var(--eai-text-3xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
}

.eai-title-md {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-sm) 0;
}

.eai-text-body {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    line-height: var(--eai-leading-relaxed);
    margin: 0;
}

.eai-text-small {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
}

.eai-label {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--eai-primary);
}

/* =====================================================
   GRADIENT BACKGROUNDS
   ===================================================== */
.eai-gradient-primary {
    background: linear-gradient(135deg, var(--eai-primary) 0%, var(--eai-primary-light) 100%);
}

.eai-gradient-secondary {
    background: linear-gradient(135deg, var(--eai-secondary) 0%, var(--eai-secondary-light) 100%);
}

.eai-gradient-dark {
    background: linear-gradient(135deg, var(--eai-dark) 0%, var(--eai-darker) 100%);
}

.eai-gradient-mesh {
    background: 
        radial-gradient(at 40% 20%, rgba(41, 198, 255, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 0%, rgba(18, 84, 184, 0.1) 0px, transparent 50%),
        radial-gradient(at 0% 50%, rgba(41, 198, 255, 0.1) 0px, transparent 50%),
        radial-gradient(at 80% 50%, rgba(18, 84, 184, 0.08) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(41, 198, 255, 0.05) 0px, transparent 50%),
        var(--eai-surface-alt);
}

/* =====================================================
   BADGES & LABELS
   ===================================================== */
.eai-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--eai-space-xs);
    padding: var(--eai-space-xs) var(--eai-space-sm);
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    border-radius: var(--eai-radius-full);
    background: var(--eai-surface-alt);
    color: var(--eai-text-secondary);
}

.eai-badge-primary {
    background: var(--eai-primary);
    color: var(--eai-text-inverse);
}

.eai-badge-secondary {
    background: var(--eai-secondary);
    color: var(--eai-dark);
}

/* =====================================================
   ICON CONTAINERS
   ===================================================== */
.eai-icon-circle {
    width: 48px;
    height: 48px;
    border-radius: var(--eai-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--eai-gradient-primary);
    color: var(--eai-text-inverse);
    font-size: var(--eai-text-xl);
    flex-shrink: 0;
}

.eai-icon-square {
    width: 48px;
    height: 48px;
    border-radius: var(--eai-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--eai-surface-alt);
    color: var(--eai-primary);
    font-size: var(--eai-text-xl);
    flex-shrink: 0;
}

/* =====================================================
   ANIMATIONS
   ===================================================== */
@keyframes eai-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes eai-slide-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes eai-scale-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes eai-pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(41, 198, 255, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(41, 198, 255, 0);
    }
}

.eai-animate-fade {
    animation: eai-fade-in var(--eai-animate-duration) ease-out forwards;
}

.eai-animate-slide-up {
    animation: eai-slide-up var(--eai-animate-duration) ease-out forwards;
}

.eai-animate-scale {
    animation: eai-scale-in var(--eai-animate-duration) ease-out forwards;
}

/* Staggered animation delays */
.eai-stagger-1 { animation-delay: calc(var(--eai-animate-stagger) * 1); }
.eai-stagger-2 { animation-delay: calc(var(--eai-animate-stagger) * 2); }
.eai-stagger-3 { animation-delay: calc(var(--eai-animate-stagger) * 3); }
.eai-stagger-4 { animation-delay: calc(var(--eai-animate-stagger) * 4); }
.eai-stagger-5 { animation-delay: calc(var(--eai-animate-stagger) * 5); }
.eai-stagger-6 { animation-delay: calc(var(--eai-animate-stagger) * 6); }
.eai-stagger-7 { animation-delay: calc(var(--eai-animate-stagger) * 7); }
.eai-stagger-8 { animation-delay: calc(var(--eai-animate-stagger) * 8); }

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .eai-animate-fade,
    .eai-animate-slide-up,
    .eai-animate-scale {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* =====================================================
   RESPONSIVE UTILITIES
   ===================================================== */
@media (max-width: 768px) {
    :root {
        --eai-space-xl: 24px;
        --eai-space-2xl: 32px;
        --eai-text-4xl: 28px;
        --eai-text-3xl: 24px;
        --eai-text-2xl: 20px;
    }
    
    .eai-card {
        padding: var(--eai-space-lg);
    }
}

@media (max-width: 480px) {
    :root {
        --eai-space-lg: 16px;
        --eai-space-xl: 20px;
    }
}

/* =====================================================
   PRINT / EXPORT STYLES
   ===================================================== */
@media print {
    .eai-visual-container {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .eai-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .eai-animate-fade,
    .eai-animate-slide-up,
    .eai-animate-scale {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* =====================================================
   HIGH CONTRAST MODE SUPPORT
   ===================================================== */
@media (prefers-contrast: high) {
    :root {
        --eai-shadow-sm: none;
        --eai-shadow-md: none;
        --eai-shadow-lg: none;
    }
    
    .eai-card {
        border: 2px solid var(--eai-dark);
    }
}

/* =====================================================
   COMPONENT-SPECIFIC STYLES
   ===================================================== */

/* A. Process Flow */
.eai-visual-process-flow {
    width: 100%;
}

.eai-process-flow-container {
    padding: var(--eai-space-lg);
}

.eai-process-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-process-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-process-track {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-lg);
    align-items: flex-start;
}

.eai-process-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-width: 150px;
    max-width: 200px;
}

.eai-node-connector {
    display: flex;
    align-items: center;
    width: 100%;
    margin-bottom: var(--eai-space-md);
}

.eai-connector-line {
    flex: 1;
    height: 2px;
    background: var(--eai-primary);
}

.eai-node-badge {
    width: 48px;
    height: 48px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
    margin: 0 var(--eai-space-sm);
}

.eai-step-number {
    font-size: var(--eai-text-lg);
}

.eai-step-icon {
    font-size: var(--eai-text-xl);
    margin-left: var(--eai-space-xs);
}

.eai-node-content {
    text-align: center;
}

.eai-node-title {
    font-size: var(--eai-text-base);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-node-description {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-node-duration {
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
    background: var(--eai-surface-alt);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    margin-top: var(--eai-space-xs);
    display: inline-block;
}

/* Process Flow - Registry Version (alternate class names) */
.eai-process-flow {
    width: 100%;
}

.eai-process-steps {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-md);
    align-items: stretch;
}

.eai-process-step {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 200px;
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
    border: 1px solid var(--eai-border);
}

.eai-process-step .eai-step-number {
    width: 40px;
    height: 40px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-lg);
    flex-shrink: 0;
    margin-right: var(--eai-space-md);
}

.eai-process-step .eai-step-content {
    flex: 1;
}

.eai-process-step .eai-step-title {
    font-size: var(--eai-text-base);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-process-step .eai-step-desc {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-step-arrow {
    font-size: var(--eai-text-xl);
    color: var(--eai-primary);
    margin: 0 var(--eai-space-sm);
    font-weight: var(--eai-font-bold);
}

/* B. Timeline */
.eai-visual-timeline {
    width: 100%;
}

.eai-timeline-container {
    padding: var(--eai-space-lg);
}

.eai-timeline-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-timeline-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-timeline-axis {
    display: flex;
    flex-direction: row;
    gap: var(--eai-space-xl);
    overflow-x: auto;
    padding-bottom: var(--eai-space-md);
}

.eai-timeline-vertical .eai-timeline-axis {
    flex-direction: column;
    align-items: center;
}

.eai-timeline-event {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 180px;
    max-width: 250px;
}

.eai-event-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--eai-space-md);
}

.eai-marker-dot {
    width: 16px;
    height: 16px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    border: 3px solid white;
    box-shadow: var(--eai-shadow-md);
}

.eai-marker-line {
    width: 2px;
    height: 30px;
    background: linear-gradient(to bottom, var(--eai-primary), transparent);
    margin-top: var(--eai-space-xs);
}

.eai-event-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-md);
    text-align: center;
}

.eai-event-date {
    margin-bottom: var(--eai-space-xs);
}

.eai-date-primary {
    font-weight: var(--eai-font-bold);
    color: var(--eai-primary);
    font-size: var(--eai-text-lg);
}

.eai-date-secondary {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    display: block;
}

.eai-event-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
    font-size: var(--eai-text-base);
}

.eai-event-description {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-event-category {
    display: inline-block;
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
    background: var(--eai-surface-alt);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    margin-top: var(--eai-space-xs);
}

/* C. Comparison Split */
.eai-visual-comparison {
    width: 100%;
}

.eai-comparison-container {
    padding: var(--eai-space-lg);
}

.eai-comparison-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-comparison-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-comparison-body {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--eai-space-lg);
    align-items: stretch;
}

@media (max-width: 768px) {
    .eai-comparison-body {
        grid-template-columns: 1fr;
    }
    .eai-comparison-vs {
        order: -1;
        margin: var(--eai-space-md) 0;
    }
}

.eai-comparison-side {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    overflow: hidden;
    box-shadow: var(--eai-shadow-md);
}

.eai-side-header {
    padding: var(--eai-space-md) var(--eai-space-lg);
    color: white;
    text-align: center;
}

.eai-side-title {
    margin: 0;
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-bold);
}

.eai-side-subtitle {
    font-size: var(--eai-text-sm);
    opacity: 0.9;
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-side-content {
    padding: var(--eai-space-lg);
}

.eai-comparison-point {
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-sm);
    margin-bottom: var(--eai-space-md);
    font-size: var(--eai-text-base);
}

.eai-point-marker {
    color: var(--eai-success);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-comparison-vs {
    display: flex;
    align-items: center;
    justify-content: center;
}

.eai-vs-text {
    font-weight: var(--eai-font-extrabold);
    color: var(--eai-text-muted);
    font-size: var(--eai-text-xl);
}

.eai-comparison-similarities {
    margin-top: var(--eai-space-xl);
    padding: var(--eai-space-lg);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
}

.eai-comparison-similarities h4 {
    margin: 0 0 var(--eai-space-sm) 0;
    color: var(--eai-dark);
}

.eai-comparison-similarities ul {
    margin: 0;
    padding-left: var(--eai-space-lg);
}

/* D. Cycle Diagram */
.eai-visual-cycle {
    width: 100%;
}

.eai-cycle-container {
    padding: var(--eai-space-lg);
}

.eai-cycle-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-cycle-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-cycle-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--eai-space-xl);
}

.eai-cycle-svg {
    max-width: 400px;
    width: 100%;
}

.eai-cycle-labels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--eai-space-md);
    width: 100%;
}

.eai-cycle-label {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    background: var(--eai-surface-alt);
    padding: var(--eai-space-sm) var(--eai-space-md);
    border-radius: var(--eai-radius-md);
}

.eai-label-number {
    width: 28px;
    height: 28px;
    border-radius: var(--eai-radius-full);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-sm);
    flex-shrink: 0;
}

.eai-label-content {
    display: flex;
    flex-direction: column;
}

.eai-label-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    font-size: var(--eai-text-sm);
}

.eai-label-desc {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
}

.eai-cycle-center-text {
    text-align: center;
    font-style: italic;
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-md);
}

/* E. Hierarchy Tree */
.eai-visual-hierarchy {
    width: 100%;
}

.eai-hierarchy-container {
    padding: var(--eai-space-lg);
}

.eai-hierarchy-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-hierarchy-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-tree-wrapper {
    display: flex;
    justify-content: center;
    overflow-x: auto;
}

.eai-tree-node {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.eai-node-wrapper {
    display: flex;
    align-items: center;
    position: relative;
}

.eai-branch-connector {
    width: 20px;
    height: 2px;
    background: var(--eai-primary);
    margin-right: var(--eai-space-sm);
}

.eai-node-box {
    background: white;
    border: 2px solid var(--eai-primary);
    border-radius: var(--eai-radius-md);
    padding: var(--eai-space-sm) var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
}

.eai-node-parent {
    background: var(--eai-gradient-primary);
    border-color: transparent;
    color: white;
}

.eai-node-parent .eai-node-label {
    color: white;
}

.eai-node-content {
    display: flex;
    align-items: center;
    gap: var(--eai-space-xs);
}

.eai-node-icon {
    font-size: var(--eai-text-lg);
}

.eai-node-label {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    font-size: var(--eai-text-base);
}

.eai-node-desc {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
    margin-left: var(--eai-space-xs);
}

.eai-children-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: var(--eai-space-md);
}

.eai-children-connector {
    width: 2px;
    height: 20px;
    background: var(--eai-primary);
}

.eai-children-list {
    display: flex;
    gap: var(--eai-space-lg);
    padding-top: var(--eai-space-md);
}

/* F. Labelling Diagram */
.eai-visual-labelling {
    width: 100%;
}

.eai-labelling-container {
    padding: var(--eai-space-lg);
}

.eai-labelling-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-labelling-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-labelling-body {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--eai-space-xl);
}

@media (max-width: 768px) {
    .eai-labelling-body {
        grid-template-columns: 1fr;
    }
}

.eai-diagram-area {
    position: relative;
}

.eai-diagram-wrapper {
    position: relative;
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.eai-diagram-image {
    max-width: 100%;
    height: auto;
}

.eai-diagram-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--eai-text-muted);
    gap: var(--eai-space-md);
}

.eai-placeholder-icon {
    font-size: 48px;
}

.eai-placeholder-text {
    font-size: var(--eai-text-sm);
}

.eai-label-marker {
    position: absolute;
    transform: translate(-50%, -50%);
    cursor: pointer;
}

.eai-marker-pulse {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: var(--eai-radius-full);
    animation: eai-pulse 2s infinite;
    opacity: 0.5;
}

.eai-marker-number {
    position: relative;
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    box-shadow: var(--eai-shadow-md);
}

.eai-labels-key {
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
}

.eai-key-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
}

.eai-key-list {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-sm);
}

.eai-label-item {
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm);
    border-radius: var(--eai-radius-md);
    transition: background 0.2s;
}

.eai-label-item:hover,
.eai-key-highlight {
    background: var(--eai-surface);
}

.eai-label-number {
    width: 24px;
    height: 24px;
    border-radius: var(--eai-radius-full);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-xs);
    flex-shrink: 0;
}

.eai-label-text {
    font-weight: var(--eai-font-medium);
    color: var(--eai-text-primary);
}

/* G. Worked Example */
.eai-visual-worked-example {
    width: 100%;
}

.eai-worked-container {
    padding: var(--eai-space-lg);
}

.eai-worked-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-worked-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-sm) 0;
}

.eai-problem-box {
    background: var(--eai-surface-alt);
    border-left: 4px solid var(--eai-warning);
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-md);
    margin-bottom: var(--eai-space-xl);
}

.eai-problem-label {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-warning);
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--eai-space-xs);
}

.eai-problem-content {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-medium);
    color: var(--eai-text-primary);
}

.eai-solution-track {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-lg);
}

.eai-solution-step {
    background: white;
    border: 1px solid var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md) var(--eai-space-lg);
    box-shadow: var(--eai-shadow-sm);
}

.eai-step-header {
    display: flex;
    align-items: center;
    gap: var(--eai-space-md);
    margin-bottom: var(--eai-space-sm);
}

.eai-step-badge {
    background: var(--eai-primary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
}

.eai-step-operation {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    font-style: italic;
}

.eai-step-explanation {
    color: var(--eai-text-primary);
    margin-bottom: var(--eai-space-sm);
}

.eai-step-calculation {
    background: var(--eai-surface-alt);
    padding: var(--eai-space-md);
    border-radius: var(--eai-radius-md);
    margin: var(--eai-space-sm) 0;
    position: relative;
}

.eai-calc-code {
    font-family: var(--eai-font-mono);
    font-size: var(--eai-text-lg);
    color: var(--eai-text-primary);
}

.eai-calc-highlight {
    background: var(--eai-secondary-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: var(--eai-font-semibold);
}

.eai-step-tip {
    display: flex;
    align-items: center;
    gap: var(--eai-space-xs);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin-top: var(--eai-space-sm);
    padding-top: var(--eai-space-sm);
    border-top: 1px dashed var(--eai-surface-alt);
}

.eai-tip-icon {
    font-size: var(--eai-text-base);
}

.eai-answer-box {
    background: var(--eai-success);
    color: white;
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-lg);
    margin-top: var(--eai-space-xl);
}

.eai-answer-label {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    text-transform: uppercase;
    opacity: 0.9;
    display: block;
    margin-bottom: var(--eai-space-xs);
}

.eai-answer-content {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
}

.eai-answer-check {
    font-size: var(--eai-text-sm);
    opacity: 0.9;
    margin-top: var(--eai-space-xs);
}

/* H. Quote Analysis */
.eai-visual-quote-analysis {
    width: 100%;
}

.eai-quote-container {
    padding: var(--eai-space-lg);
}

.eai-quote-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-quote-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-context-box {
    background: var(--eai-surface-alt);
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-md);
    margin-bottom: var(--eai-space-xl);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
}

.eai-quote-block {
    background: linear-gradient(135deg, var(--eai-surface-alt) 0%, var(--eai-surface) 100%);
    border-left: 4px solid var(--eai-primary);
    padding: var(--eai-space-xl);
    border-radius: var(--eai-radius-lg);
    margin: 0 0 var(--eai-space-xl) 0;
    position: relative;
}

.eai-quote-mark-open,
.eai-quote-mark-close {
    font-size: 60px;
    color: var(--eai-primary);
    opacity: 0.2;
    line-height: 1;
    position: absolute;
}

.eai-quote-mark-open {
    top: 10px;
    left: 20px;
}

.eai-quote-mark-close {
    bottom: -10px;
    right: 20px;
}

.eai-quote-text {
    font-size: var(--eai-text-xl);
    font-style: italic;
    color: var(--eai-text-primary);
    line-height: var(--eai-leading-relaxed);
    margin: 0;
    position: relative;
    z-index: 1;
}

.eai-quote-mark {
    padding: 2px 6px;
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.2s;
}

.eai-quote-mark:hover,
.eai-mark-active {
    transform: scale(1.05);
    box-shadow: var(--eai-shadow-md);
}

.eai-quote-source {
    display: block;
    text-align: right;
    margin-top: var(--eai-space-md);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    font-style: normal;
}

.eai-annotations-panel {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    box-shadow: var(--eai-shadow-sm);
}

.eai-annotations-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
}

.eai-annotations-list {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-annotation-item {
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-md);
    padding: var(--eai-space-sm);
    border-radius: var(--eai-radius-md);
    transition: background 0.2s;
    cursor: pointer;
}

.eai-annotation-item:hover {
    background: var(--eai-surface-alt);
}

.eai-annotation-highlight {
    padding: 4px 12px;
    border-radius: var(--eai-radius-md);
    font-weight: var(--eai-font-semibold);
    font-size: var(--eai-text-sm);
    white-space: nowrap;
}

.eai-annotation-content {
    flex: 1;
}

.eai-annotation-label {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-primary);
    text-transform: uppercase;
    display: block;
    margin-bottom: 2px;
}

.eai-annotation-note {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
}

.eai-annotation-effect {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-xs);
}

.eai-themes-footer {
    margin-top: var(--eai-space-xl);
    padding-top: var(--eai-space-md);
    border-top: 1px solid var(--eai-surface-alt);
}

.eai-themes-label {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-secondary);
    margin-right: var(--eai-space-sm);
}

.eai-theme-tag {
    display: inline-block;
    background: var(--eai-surface-alt);
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 2px;
}

/* I. Cause & Effect */
.eai-visual-cause-effect {
    width: 100%;
}

.eai-cause-effect-container {
    padding: var(--eai-space-lg);
}

.eai-cause-effect-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-cause-effect-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-cause-effect-layout {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--eai-space-lg);
    align-items: start;
}

@media (max-width: 768px) {
    .eai-cause-effect-layout {
        grid-template-columns: 1fr;
    }
    .eai-central-section {
        order: -1;
    }
}

.eai-section-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
}

.eai-section-icon {
    font-size: var(--eai-text-xl);
}

.eai-factors-list {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-factor-card {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
    border-left: 4px solid var(--eai-primary);
}

.eai-factor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--eai-space-xs);
    padding-bottom: var(--eai-space-xs);
    border-bottom: 1px solid var(--eai-surface-alt);
}

.eai-factor-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
}

.eai-factor-strength {
    font-size: var(--eai-text-xs);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    text-transform: uppercase;
    font-weight: var(--eai-font-semibold);
}

.eai-strength-high {
    background: var(--eai-error);
    color: white;
}

.eai-strength-medium {
    background: var(--eai-warning);
    color: white;
}

.eai-strength-low {
    background: var(--eai-success);
    color: white;
}

.eai-factor-desc {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-factor-category {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-xs);
    display: block;
}

.eai-central-section {
    display: flex;
    justify-content: center;
}

.eai-central-node {
    background: var(--eai-gradient-primary);
    color: white;
    padding: var(--eai-space-lg) var(--eai-space-xl);
    border-radius: var(--eai-radius-xl);
    text-align: center;
    box-shadow: var(--eai-shadow-lg);
    position: relative;
}

.eai-central-label {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    display: block;
}

.eai-central-date {
    font-size: var(--eai-text-sm);
    opacity: 0.9;
    margin-top: var(--eai-space-xs);
    display: block;
}

/* J. Data Chart */
.eai-visual-data-chart {
    width: 100%;
}

.eai-chart-container {
    padding: var(--eai-space-lg);
}

.eai-chart-header {
    margin-bottom: var(--eai-space-lg);
}

.eai-chart-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-chart-subtitle {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-chart-canvas-wrapper {
    position: relative;
    height: 400px;
    margin: var(--eai-space-lg) 0;
}

.eai-chart-canvas {
    max-height: 100%;
}

.eai-fallback-chart {
    padding: var(--eai-space-lg);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
}

.eai-bars-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--eai-space-lg);
    height: 300px;
    padding: var(--eai-space-md);
}

.eai-fallback-bar-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    max-width: 80px;
}

.eai-fallback-bar {
    width: 100%;
    min-height: 30px;
    border-radius: var(--eai-radius-sm) var(--eai-radius-sm) 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--eai-space-xs);
    color: white;
    font-weight: var(--eai-font-semibold);
    font-size: var(--eai-text-sm);
    transition: height 0.5s ease-out;
}

.eai-bar-value {
    margin-top: 4px;
}

.eai-bar-label {
    margin-top: var(--eai-space-sm);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    text-align: center;
}

.eai-chart-source,
.eai-chart-footnote {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-md);
    font-style: italic;
}

/* K. Vocabulary Grid */
.eai-visual-vocabulary {
    width: 100%;
}

.eai-vocabulary-container {
    padding: var(--eai-space-lg);
}

.eai-vocabulary-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-vocabulary-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-vocabulary-subtitle {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--eai-space-lg);
}

.eai-vocab-card {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    box-shadow: var(--eai-shadow-md);
    border-top: 4px solid var(--eai-primary);
}

.eai-vocab-header {
    margin-bottom: var(--eai-space-md);
    padding-bottom: var(--eai-space-sm);
    border-bottom: 1px solid var(--eai-surface-alt);
}

.eai-vocab-word {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-vocab-phonetic {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    font-style: italic;
    margin-left: var(--eai-space-sm);
}

.eai-vocab-pos {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
    background: var(--eai-surface-alt);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    margin-left: var(--eai-space-sm);
}

.eai-vocab-definition {
    font-size: var(--eai-text-base);
    color: var(--eai-text-primary);
    line-height: var(--eai-leading-relaxed);
    margin: 0 0 var(--eai-space-md) 0;
}

.eai-vocab-example {
    background: var(--eai-surface-alt);
    padding: var(--eai-space-sm) var(--eai-space-md);
    border-radius: var(--eai-radius-md);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    font-style: italic;
}

.eai-example-label {
    font-weight: var(--eai-font-semibold);
    font-style: normal;
    margin-right: var(--eai-space-xs);
}

.eai-vocab-synonyms {
    margin-top: var(--eai-space-md);
    font-size: var(--eai-text-sm);
}

.eai-synonyms-label {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-secondary);
    margin-right: var(--eai-space-sm);
}

.eai-synonym-tag {
    display: inline-block;
    background: var(--eai-secondary-light);
    color: var(--eai-dark);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    margin: 2px;
    font-size: var(--eai-text-xs);
}

.eai-vocab-category {
    display: inline-block;
    margin-top: var(--eai-space-md);
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
    background: var(--eai-surface-alt);
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-weight: var(--eai-font-semibold);
}

/* L. Flashcard Layout */
.eai-visual-flashcards {
    width: 100%;
}

.eai-flashcards-container {
    padding: var(--eai-space-lg);
}

.eai-flashcards-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-flashcards-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-flashcards-instructions {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-flashcards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--eai-space-lg);
}

.eai-flashcard {
    perspective: 1000px;
    cursor: pointer;
    height: 200px;
}

.eai-flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.eai-flashcard.eai-flipped .eai-flashcard-inner {
    transform: rotateY(180deg);
}

.eai-flashcard-front,
.eai-flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    display: flex;
    flex-direction: column;
    box-shadow: var(--eai-shadow-md);
}

.eai-flashcard-front {
    background: linear-gradient(135deg, var(--eai-primary) 0%, var(--eai-primary-light) 100%);
    color: white;
}

.eai-flashcard-back {
    background: white;
    transform: rotateY(180deg);
    border: 2px solid var(--eai-primary);
}

.eai-card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.eai-card-badge {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    opacity: 0.7;
    margin-bottom: var(--eai-space-sm);
}

.eai-badge-answer {
    color: var(--eai-primary);
    opacity: 1;
}

.eai-question-text {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    margin: 0;
}

.eai-answer-text {
    font-size: var(--eai-text-base);
    color: var(--eai-text-primary);
    margin: 0;
}

.eai-flip-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--eai-space-xs);
    font-size: var(--eai-text-xs);
    opacity: 0.8;
    margin-top: auto;
}

.eai-flip-icon {
    width: 16px;
    height: 16px;
}

.eai-additional-info {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin-top: var(--eai-space-md);
    padding-top: var(--eai-space-sm);
    border-top: 1px solid var(--eai-surface-alt);
}

.eai-flashcards-counter {
    text-align: center;
    margin-top: var(--eai-space-xl);
}

.eai-counter-text {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    background: var(--eai-surface-alt);
    padding: var(--eai-space-sm) var(--eai-space-lg);
    border-radius: var(--eai-radius-full);
}

/* M. Sequence Ordering */
.eai-visual-sequence {
    width: 100%;
}

.eai-sequence-container {
    padding: var(--eai-space-lg);
}

.eai-sequence-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-sequence-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-sequence-track {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-md);
    align-items: flex-start;
    justify-content: center;
}

.eai-sequence-vertical .eai-sequence-track {
    flex-direction: column;
    align-items: stretch;
}

.eai-sequence-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-width: 140px;
    max-width: 180px;
}

.eai-sequence-vertical .eai-sequence-item {
    flex-direction: row;
    max-width: none;
    align-items: center;
}

.eai-sequence-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.eai-sequence-vertical .eai-sequence-node {
    flex-direction: row;
}

.eai-sequence-number {
    width: 40px;
    height: 40px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-lg);
}

.eai-sequence-arrow {
    color: var(--eai-primary);
    margin: var(--eai-space-sm) 0;
}

.eai-sequence-vertical .eai-sequence-arrow {
    margin: 0 var(--eai-space-md);
    transform: rotate(-90deg);
}

.eai-sequence-arrow svg {
    width: 24px;
    height: 24px;
}

.eai-sequence-box {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-md);
    text-align: center;
    margin-top: var(--eai-space-md);
    width: 100%;
}

.eai-sequence-vertical .eai-sequence-box {
    margin-top: 0;
    margin-left: var(--eai-space-md);
    text-align: left;
}

.eai-step-icon {
    font-size: var(--eai-text-2xl);
    margin-bottom: var(--eai-space-xs);
    display: block;
}

.eai-step-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
    font-size: var(--eai-text-base);
}

.eai-step-description {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-step-duration {
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
    background: var(--eai-surface-alt);
    padding: 2px 8px;
    border-radius: var(--eai-radius-full);
    margin-top: var(--eai-space-xs);
    display: inline-block;
}

.eai-step-outcome {
    font-size: var(--eai-text-xs);
    color: var(--eai-success);
    display: block;
    margin-top: var(--eai-space-xs);
}

.eai-sequence-result {
    text-align: center;
    margin-top: var(--eai-space-xl);
    padding: var(--eai-space-md) var(--eai-space-lg);
    background: var(--eai-success);
    color: white;
    border-radius: var(--eai-radius-lg);
    font-weight: var(--eai-font-semibold);
}

/* N. Formula Breakdown */
.eai-visual-formula {
    width: 100%;
}

.eai-formula-container {
    padding: var(--eai-space-lg);
}

.eai-formula-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-formula-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-formula-desc {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-formula-display {
    text-align: center;
    margin: var(--eai-space-xl) 0;
    padding: var(--eai-space-xl);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
}

.eai-formula-box {
    display: inline-block;
}

.eai-formula-code {
    font-family: var(--eai-font-mono);
    font-size: var(--eai-text-3xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    background: white;
    padding: var(--eai-space-md) var(--eai-space-xl);
    border-radius: var(--eai-radius-md);
    box-shadow: var(--eai-shadow-md);
}

.eai-formula-pronunciation {
    display: block;
    margin-top: var(--eai-space-md);
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    font-style: italic;
}

.eai-variables-section {
    margin: var(--eai-space-xl) 0;
}

.eai-section-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
}

.eai-variables-list {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-variable-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-md);
    background: white;
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-md);
    box-shadow: var(--eai-shadow-sm);
}

.eai-variable-symbol-box {
    background: var(--eai-gradient-primary);
    padding: var(--eai-space-sm) var(--eai-space-md);
    border-radius: var(--eai-radius-md);
}

.eai-variable-symbol {
    font-family: var(--eai-font-mono);
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    color: white;
}

.eai-variable-details {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-sm);
    align-items: center;
}

.eai-variable-name {
    font-weight: var(--eai-font-medium);
    color: var(--eai-text-primary);
}

.eai-variable-unit {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    font-style: italic;
}

.eai-variable-value {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-primary);
}

.eai-variable-note {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin-left: auto;
    font-style: italic;
}

.eai-example-section {
    margin: var(--eai-space-xl) 0;
}

.eai-example-box {
    background: white;
    border-left: 4px solid var(--eai-success);
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-md);
    box-shadow: var(--eai-shadow-sm);
}

.eai-example-code {
    font-family: var(--eai-font-mono);
    font-size: var(--eai-text-lg);
    color: var(--eai-dark);
    display: block;
    margin-bottom: var(--eai-space-sm);
}

.eai-example-explanation {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

.eai-applications-section {
    margin-top: var(--eai-space-xl);
}

.eai-applications-list {
    margin: var(--eai-space-md) 0 0 0;
    padding-left: var(--eai-space-lg);
    color: var(--eai-text-secondary);
}

.eai-applications-list li {
    margin-bottom: var(--eai-space-xs);
}

/* O. Case Study Layout */
.eai-visual-case-study {
    width: 100%;
}

.eai-case-study-container {
    padding: var(--eai-space-lg);
}

.eai-case-header {
    background: var(--eai-gradient-primary);
    color: white;
    padding: var(--eai-space-lg) var(--eai-space-xl);
    border-radius: var(--eai-radius-lg);
    margin-bottom: var(--eai-space-xl);
}

.eai-case-badge {
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    text-transform: uppercase;
    opacity: 0.9;
    display: block;
    margin-bottom: var(--eai-space-xs);
}

.eai-case-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    margin: 0;
}

.eai-case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-md);
    margin-top: var(--eai-space-sm);
}

.eai-meta-item {
    font-size: var(--eai-text-sm);
    opacity: 0.9;
}

.eai-case-section {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    margin-bottom: var(--eai-space-lg);
    box-shadow: var(--eai-shadow-sm);
}

.eai-context-box {
    border-left: 4px solid var(--eai-primary);
}

.eai-context-box h3 {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-sm) 0;
}

.eai-context-text {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    line-height: var(--eai-leading-relaxed);
    margin: 0;
}

.eai-key-facts {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-sm);
    margin-top: var(--eai-space-md);
}

.eai-fact-tag {
    background: var(--eai-surface-alt);
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
}

.eai-case-issues h3,
.eai-case-solutions h3,
.eai-case-outcomes h3,
.eai-stats-section h3,
.eai-questions-section h3 {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-md) 0;
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
}

.eai-issues-list,
.eai-solutions-list,
.eai-outcomes-list {
    margin: 0;
    padding-left: var(--eai-space-lg);
}

.eai-issues-list li,
.eai-solutions-list li,
.eai-outcomes-list li {
    margin-bottom: var(--eai-space-sm);
    color: var(--eai-text-secondary);
}

.eai-title-issues {
    color: var(--eai-error);
}

.eai-title-solutions {
    color: var(--eai-success);
}

.eai-title-outcomes {
    color: var(--eai-primary);
}

.eai-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--eai-space-md);
}

.eai-stat-item {
    text-align: center;
    padding: var(--eai-space-md);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-md);
}

.eai-stat-value {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-primary);
    display: block;
}

.eai-stat-label {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin-top: var(--eai-space-xs);
    display: block;
}

.eai-questions-list {
    margin: 0;
    padding-left: 0;
    list-style: none;
}

.eai-questions-list li {
    padding: var(--eai-space-sm) 0;
    border-bottom: 1px solid var(--eai-surface-alt);
    color: var(--eai-text-secondary);
}

.eai-questions-list li:last-child {
    border-bottom: none;
}

.eai-question-number {
    font-weight: var(--eai-font-bold);
    color: var(--eai-primary);
    margin-right: var(--eai-space-sm);
}

.eai-case-footer {
    margin-top: var(--eai-space-xl);
    padding-top: var(--eai-space-md);
    border-top: 1px solid var(--eai-surface-alt);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    font-style: italic;
}

/* P. Flowchart */
.eai-visual-flowchart {
    width: 100%;
}

.eai-flowchart-container {
    padding: var(--eai-space-lg);
}

.eai-flowchart-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-flowchart-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-flowchart-canvas {
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    overflow-x: auto;
}

.eai-flowchart-svg {
    max-width: 100%;
    height: auto;
}

.eai-flowchart-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--eai-space-md);
    margin-top: var(--eai-space-lg);
    padding: var(--eai-space-md);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-md);
}

.eai-legend-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-secondary);
}

.eai-legend-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-xs);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
}

.eai-legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

/* Q. Table Layout */
.eai-visual-table {
    width: 100%;
}

.eai-table-container {
    padding: var(--eai-space-lg);
}

.eai-table-header {
    margin-bottom: var(--eai-space-lg);
}

.eai-table-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-table-subtitle {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-table-wrapper {
    overflow-x: auto;
    border-radius: var(--eai-radius-lg);
    box-shadow: var(--eai-shadow-sm);
}

.eai-data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.eai-data-table thead {
    background: var(--eai-gradient-primary);
    color: white;
}

.eai-table-header-cell {
    padding: var(--eai-space-md) var(--eai-space-lg);
    font-weight: var(--eai-font-semibold);
    text-align: left;
    font-size: var(--eai-text-sm);
}

.eai-table-row {
    border-bottom: 1px solid var(--eai-surface-alt);
}

.eai-table-row:last-child {
    border-bottom: none;
}

.eai-table-row:hover {
    background: var(--eai-surface-alt);
}

.eai-table-cell {
    padding: var(--eai-space-md) var(--eai-space-lg);
    font-size: var(--eai-text-base);
    color: var(--eai-text-primary);
}

.eai-cell-first {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
}

.eai-table-footnote {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-md);
    font-style: italic;
}

.eai-table-source {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-sm);
}

/* R. Key Concepts */
.eai-visual-concepts {
    width: 100%;
}

.eai-concepts-container {
    padding: var(--eai-space-lg);
}

.eai-concepts-header {
    margin-bottom: var(--eai-space-xl);
}

.eai-concepts-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-concepts-subtitle {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--eai-space-lg);
}

.eai-concepts-list .eai-concepts-grid {
    grid-template-columns: 1fr;
}

.eai-concept-card {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    box-shadow: var(--eai-shadow-md);
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-md);
}

.eai-concept-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--eai-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-concept-content {
    flex: 1;
}

.eai-concept-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-concept-description {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    line-height: var(--eai-leading-relaxed);
    margin: 0;
}

.eai-concept-example {
    margin-top: var(--eai-space-sm);
    padding: var(--eai-space-sm) var(--eai-space-md);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-md);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    font-style: italic;
}

.eai-example-label {
    font-weight: var(--eai-font-semibold);
    font-style: normal;
    margin-right: var(--eai-space-xs);
}

.eai-concept-related {
    margin-top: var(--eai-space-sm);
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
}

/* S. Image Callout */
.eai-visual-image-callout {
    width: 100%;
}

.eai-image-callout-container {
    padding: var(--eai-space-lg);
}

.eai-image-callout-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-image-callout-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-callout-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--eai-space-xl);
}

@media (max-width: 768px) {
    .eai-callout-container {
        grid-template-columns: 1fr;
    }
}

.eai-callout-image {
    position: relative;
}

.eai-callout-wrapper {
    position: relative;
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.eai-callout-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--eai-radius-lg);
}

.eai-callout-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--eai-text-muted);
    gap: var(--eai-space-md);
}

.eai-hotspot-marker {
    position: absolute;
    transform: translate(-50%, -50%);
    cursor: pointer;
}

.eai-hotspot-pulse {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: var(--eai-radius-full);
    animation: eai-pulse 2s infinite;
    opacity: 0.5;
}

.eai-hotspot-number {
    position: relative;
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    box-shadow: var(--eai-shadow-md);
}

.eai-callout-panels {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-callout-panel {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
    border-left: 4px solid var(--eai-primary);
}

.eai-callout-header-row {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    margin-bottom: var(--eai-space-sm);
}

.eai-callout-marker {
    width: 24px;
    height: 24px;
    border-radius: var(--eai-radius-full);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-xs);
    flex-shrink: 0;
}

.eai-callout-content h4 {
    font-size: var(--eai-text-base);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-callout-content p {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-callout-fact {
    font-size: var(--eai-text-xs);
    color: var(--eai-primary);
    margin-top: var(--eai-space-sm);
    display: block;
}

/* T. Statistics Panel */
.eai-visual-statistics {
    width: 100%;
}

.eai-statistics-container {
    padding: var(--eai-space-lg);
}

.eai-statistics-header {
    margin-bottom: var(--eai-space-xl);
    text-align: center;
}

.eai-statistics-title {
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-statistics-subtitle {
    font-size: var(--eai-text-base);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

.eai-statistics-period {
    display: inline-block;
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    background: var(--eai-surface-alt);
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    margin-top: var(--eai-space-sm);
}

.eai-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--eai-space-lg);
}

.eai-stat-card {
    background: white;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    box-shadow: var(--eai-shadow-md);
    text-align: center;
    transition: transform 0.2s;
}

.eai-stat-card:hover {
    transform: translateY(-4px);
}

.eai-stat-highlight {
    border: 2px solid var(--eai-primary);
    box-shadow: var(--eai-shadow-glow);
}

.eai-stat-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--eai-space-xs);
    margin-bottom: var(--eai-space-md);
}

.eai-stat-icon {
    font-size: var(--eai-text-xl);
}

.eai-stat-label {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.eai-stat-value-container {
    margin: var(--eai-space-md) 0;
}

.eai-stat-value {
    font-size: var(--eai-text-3xl);
    font-weight: var(--eai-font-extrabold);
    line-height: 1;
}

.eai-stat-unit {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    margin-left: var(--eai-space-xs);
}

.eai-stat-change {
    display: inline-flex;
    align-items: center;
    gap: var(--eai-space-xs);
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-size: var(--eai-text-sm);
    font-weight: var(--eai-font-semibold);
}

.eai-trend-up {
    background: var(--eai-success);
    color: white;
}

.eai-trend-down {
    background: var(--eai-error);
    color: white;
}

.eai-trend-neutral {
    background: var(--eai-surface-alt);
    color: var(--eai-text-secondary);
}

.eai-change-arrow {
    font-size: var(--eai-text-sm);
}

.eai-stat-description {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-md) 0 0 0;
}

.eai-stat-progress {
    margin-top: var(--eai-space-md);
}

.eai-progress-bar {
    height: 8px;
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-full);
    overflow: hidden;
    margin-bottom: var(--eai-space-xs);
}

.eai-progress-fill {
    height: 100%;
    background: var(--eai-gradient-primary);
    border-radius: var(--eai-radius-full);
    transition: width 0.5s ease-out;
}

.eai-progress-text {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
}

.eai-stat-comparison {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
    margin-top: var(--eai-space-xs);
    display: block;
}

.eai-statistics-summary {
    margin-top: var(--eai-space-xl);
    padding: var(--eai-space-lg);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    text-align: center;
}

.eai-statistics-summary p {
    margin: 0;
    color: var(--eai-text-secondary);
    font-size: var(--eai-text-base);
}

.eai-statistics-source {
    text-align: center;
    margin-top: var(--eai-space-md);
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    font-style: italic;
}

/* =====================================================
   REGISTRY COMPONENT STYLES (Alternate Class Names)
   ===================================================== */

/* Timeline Registry Styles */
.eai-timeline {
    width: 100%;
}

.eai-timeline--horizontal .eai-timeline-track {
    display: flex;
    flex-direction: row;
    gap: var(--eai-space-lg);
    overflow-x: auto;
    padding: var(--eai-space-md) 0;
}

.eai-timeline--vertical .eai-timeline-track {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 180px;
    position: relative;
}

.eai-timeline-dot {
    width: 16px;
    height: 16px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    border: 3px solid white;
    box-shadow: var(--eai-shadow-md);
}

.eai-timeline-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    margin-top: var(--eai-space-sm);
    box-shadow: var(--eai-shadow-sm);
    border: 1px solid var(--eai-border);
    text-align: center;
    min-width: 150px;
}

.eai-timeline-date {
    font-size: var(--eai-text-sm);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-primary);
    margin-bottom: var(--eai-space-xs);
}

.eai-timeline-title {
    font-size: var(--eai-text-base);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-timeline-desc {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

/* Comparison Split Registry Styles */
.eai-comparison-split {
    width: 100%;
}

.eai-comparison-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--eai-space-md);
    align-items: stretch;
}

.eai-comparison-side {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    overflow: hidden;
    box-shadow: var(--eai-shadow-sm);
    border: 1px solid var(--eai-border);
}

.eai-comparison-header {
    padding: var(--eai-space-md);
    color: white;
    text-align: center;
}

.eai-comparison-header h3 {
    margin: 0;
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-bold);
}

.eai-comparison-content {
    padding: var(--eai-space-md);
}

.eai-comparison-point {
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm) 0;
    border-bottom: 1px solid var(--eai-border);
}

.eai-comparison-point:last-child {
    border-bottom: none;
}

.eai-point-icon {
    color: var(--eai-success);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-comparison-vs {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-lg);
    color: var(--eai-text-muted);
    padding: var(--eai-space-sm);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-full);
    align-self: center;
}

/* Cycle Diagram Registry Styles */
.eai-cycle-diagram {
    width: 100%;
}

.eai-cycle-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--eai-space-lg);
}

.eai-cycle-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.eai-cycle-node {
    cursor: pointer;
    transition: all 0.3s ease;
}

.eai-cycle-node:hover {
    filter: brightness(1.1);
}

.eai-cycle-labels {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--eai-space-md);
    margin-top: var(--eai-space-lg);
}

.eai-cycle-label {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    background: var(--eai-surface);
    padding: var(--eai-space-sm) var(--eai-space-md);
    border-radius: var(--eai-radius-md);
    border: 1px solid var(--eai-border);
    box-shadow: var(--eai-shadow-sm);
}

.eai-cycle-number {
    width: 24px;
    height: 24px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-cycle-text {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-primary);
    font-weight: var(--eai-font-medium);
}

/* Hierarchy Tree Registry Styles */
.eai-hierarchy-tree {
    width: 100%;
}

.eai-tree-container {
    padding: var(--eai-space-lg);
    display: flex;
    justify-content: center;
}

.eai-tree-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.eai-tree-content {
    background: var(--eai-surface);
    border: 2px solid var(--eai-primary);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md) var(--eai-space-lg);
    box-shadow: var(--eai-shadow-md);
    position: relative;
    z-index: 1;
}

.eai-tree-label {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    font-size: var(--eai-text-base);
}

.eai-tree-children {
    display: flex;
    gap: var(--eai-space-lg);
    margin-top: var(--eai-space-xl);
    position: relative;
}

/* Vertical connector line from parent to children row */
.eai-tree-node > .eai-tree-content::after {
    content: '';
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 24px;
    background: var(--eai-primary);
}

/* Remove connector from leaf nodes */
.eai-tree-node:not(:has(.eai-tree-children)) > .eai-tree-content::after {
    display: none;
}

/* Horizontal connector line across children */
.eai-tree-children::before {
    content: '';
    position: absolute;
    top: -24px;
    left: calc(var(--eai-space-lg) / 2);
    right: calc(var(--eai-space-lg) / 2);
    height: 2px;
    background: var(--eai-primary);
}

/* Vertical connector from each child up to horizontal line */
.eai-tree-children > .eai-tree-node::before {
    content: '';
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 24px;
    background: var(--eai-primary);
}

/* Labelling Diagram Registry Styles */
.eai-labelling-diagram {
    width: 100%;
}

.eai-labelling-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--eai-space-lg);
    padding: var(--eai-space-lg);
}

.eai-labelling-image {
    position: relative;
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.eai-labelling-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--eai-radius-lg);
}

.eai-labelling-placeholder {
    color: var(--eai-text-muted);
    font-style: italic;
}

.eai-label-marker {
    position: absolute;
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    cursor: pointer;
    box-shadow: var(--eai-shadow-md);
    transform: translate(-50%, -50%);
    transition: all 0.2s ease;
}

.eai-label-marker:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.eai-marker-number {
    font-size: var(--eai-text-sm);
}

.eai-labelling-key {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-sm);
}

.eai-label-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-md);
    border: 1px solid var(--eai-border);
}

.eai-label-number {
    width: 24px;
    height: 24px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-label-text {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-primary);
}

/* Worked Example Registry Styles */
.eai-worked-example {
    width: 100%;
}

.eai-example-steps {
    padding: var(--eai-space-lg);
}

.eai-example-step {
    display: flex;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md) 0;
    border-bottom: 1px solid var(--eai-border);
}

.eai-example-step:last-child {
    border-bottom: none;
}

.eai-step-badge {
    background: var(--eai-gradient-primary);
    color: white;
    padding: var(--eai-space-xs) var(--eai-space-md);
    border-radius: var(--eai-radius-md);
    font-size: var(--eai-text-sm);
    font-weight: var(--eai-font-semibold);
    height: fit-content;
    flex-shrink: 0;
}

.eai-step-action {
    font-size: var(--eai-text-base);
    color: var(--eai-text-primary);
    margin-bottom: var(--eai-space-xs);
}

.eai-step-calc {
    font-family: var(--eai-font-mono);
    background: var(--eai-surface-alt);
    padding: var(--eai-space-sm);
    border-radius: var(--eai-radius-md);
    font-size: var(--eai-text-sm);
    margin: var(--eai-space-xs) 0;
}

.eai-step-result {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-success);
    margin-top: var(--eai-space-xs);
}

.eai-example-answer {
    margin: var(--eai-space-lg);
    padding: var(--eai-space-md);
    background: var(--eai-success-light);
    border: 1px solid var(--eai-success);
    border-radius: var(--eai-radius-md);
    color: var(--eai-success);
    font-weight: var(--eai-font-semibold);
}

/* Quote Analysis Registry Styles */
.eai-quote-analysis {
    width: 100%;
}

.eai-quote-container {
    padding: var(--eai-space-lg);
}

.eai-quote-text {
    font-size: var(--eai-text-xl);
    font-style: italic;
    color: var(--eai-text-primary);
    border-left: 4px solid var(--eai-primary);
    padding-left: var(--eai-space-lg);
    margin: 0 0 var(--eai-space-lg) 0;
    line-height: 1.6;
}

.eai-quote-text cite {
    display: block;
    margin-top: var(--eai-space-sm);
    font-size: var(--eai-text-sm);
    font-style: normal;
    color: var(--eai-text-secondary);
}

.eai-quote-annotations {
    display: flex;
    flex-wrap: wrap;
    gap: var(--eai-space-sm);
}

.eai-annotation {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm) var(--eai-space-md);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-md);
    border: 1px solid var(--eai-border);
}

.eai-annotation-highlight {
    padding: 2px 8px;
    border-radius: var(--eai-radius-sm);
    font-weight: var(--eai-font-semibold);
    font-size: var(--eai-text-sm);
}

.eai-annotation-note {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
}

/* Cause Effect Registry Styles */
.eai-cause-effect {
    width: 100%;
}

.eai-cause-effect-layout {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--eai-space-lg);
    padding: var(--eai-space-lg);
    align-items: center;
}

.eai-causes-column,
.eai-effects-column {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-sm);
}

.eai-column-title {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0 0 var(--eai-space-sm) 0;
    text-align: center;
}

.eai-causes-list,
.eai-effects-list {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-sm);
}

.eai-cause-item,
.eai-effect-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm) var(--eai-space-md);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-md);
    border: 1px solid var(--eai-border);
}

.eai-cause-item {
    justify-content: flex-end;
}

.eai-effect-item {
    justify-content: flex-start;
}

.eai-cause-arrow,
.eai-effect-arrow {
    font-size: var(--eai-text-xl);
    color: var(--eai-primary);
    font-weight: var(--eai-font-bold);
}

.eai-cause-arrow {
    margin-left: var(--eai-space-sm);
}

.eai-effect-arrow {
    margin-right: var(--eai-space-sm);
}

.eai-central-node {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1254B8 0%, #0F2E5C 100%);
    padding: var(--eai-space-md) var(--eai-space-lg);
    border-radius: var(--eai-radius-lg);
    text-align: center;
    box-shadow: var(--eai-shadow-lg);
    min-width: 140px;
    min-height: 80px;
}

.eai-central-node .eai-node-content {
    color: #ffffff !important;
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-bold);
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
    line-height: 1.3;
}

/* Data Chart Registry Styles */
.eai-data-chart {
    width: 100%;
}

.eai-chart-container {
    padding: var(--eai-space-lg);
    min-height: 300px;
}

.eai-chart-container canvas {
    max-height: 400px;
}

/* Vocabulary Grid Registry Styles */
.eai-vocabulary-grid {
    width: 100%;
}

.eai-vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--eai-space-md);
    padding: var(--eai-space-lg);
}

.eai-vocab-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    border: 1px solid var(--eai-border);
    box-shadow: var(--eai-shadow-sm);
    transition: all 0.2s ease;
}

.eai-vocab-card:hover {
    box-shadow: var(--eai-shadow-md);
    transform: translateY(-2px);
}

.eai-vocab-word {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-bold);
    color: var(--eai-primary);
    margin-bottom: var(--eai-space-xs);
}

.eai-vocab-phonetic {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-muted);
    font-style: italic;
    margin-bottom: var(--eai-space-xs);
}

.eai-vocab-definition {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-primary);
    margin-bottom: var(--eai-space-xs);
}

.eai-vocab-example {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
    font-style: italic;
    border-left: 3px solid var(--eai-secondary);
    padding-left: var(--eai-space-sm);
    margin-top: var(--eai-space-sm);
}

/* Flashcard Layout Registry Styles */
.eai-flashcard-layout {
    width: 100%;
}

.eai-flashcard-stack {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--eai-space-md);
    padding: var(--eai-space-lg);
    perspective: 1000px;
}

.eai-flashcard {
    position: relative;
    height: 200px;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s;
}

.eai-flashcard--flipped {
    transform: rotateY(180deg);
}

.eai-flashcard-front,
.eai-flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--eai-shadow-md);
}

.eai-flashcard-front {
    background: linear-gradient(135deg, var(--eai-primary) 0%, var(--eai-dark) 100%);
    color: white;
}

.eai-flashcard-back {
    background: var(--eai-surface);
    border: 2px solid var(--eai-primary);
    transform: rotateY(180deg);
}

.eai-flashcard-question {
    font-size: var(--eai-text-lg);
    font-weight: var(--eai-font-semibold);
    text-align: center;
}

.eai-flashcard-hint {
    font-size: var(--eai-text-xs);
    opacity: 0.8;
    margin-top: var(--eai-space-sm);
}

.eai-flashcard-answer {
    font-size: var(--eai-text-base);
    color: var(--eai-text-primary);
    text-align: center;
}

/* Sequence Ordering Registry Styles */
.eai-sequence-ordering {
    width: 100%;
}

.eai-sequence-track {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: var(--eai-space-lg);
    justify-content: center;
    gap: 0;
}

.eai-sequence-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    margin: var(--eai-space-sm);
}

.eai-sequence-number {
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-sm);
    flex-shrink: 0;
}

.eai-sequence-box {
    background: var(--eai-surface);
    border: 2px solid var(--eai-primary);
    border-radius: var(--eai-radius-md);
    padding: var(--eai-space-sm) var(--eai-space-md);
    min-width: 120px;
    text-align: center;
}

.eai-sequence-title {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    font-size: var(--eai-text-sm);
}

.eai-sequence-desc {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
    margin-top: var(--eai-space-xs);
}

.eai-sequence-connector {
    font-size: var(--eai-text-2xl);
    color: var(--eai-primary);
    font-weight: var(--eai-font-bold);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--eai-space-md);
    margin-top: 0;
    line-height: 1;
}

/* Formula Breakdown Registry Styles */
.eai-formula-breakdown {
    width: 100%;
}

.eai-formula-main {
    font-family: var(--eai-font-mono);
    font-size: var(--eai-text-2xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    background: white;
    padding: var(--eai-space-md) var(--eai-space-xl);
    border-radius: var(--eai-radius-md);
    box-shadow: var(--eai-shadow-sm);
    display: inline-block;
}

.eai-variable-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-sm) 0;
    border-bottom: 1px solid var(--eai-border);
}

.eai-variable-item:last-child {
    border-bottom: none;
}

.eai-variable-symbol {
    font-family: var(--eai-font-mono);
    font-weight: var(--eai-font-bold);
    color: var(--eai-primary);
    font-size: var(--eai-text-lg);
    min-width: 30px;
}

.eai-variable-name {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-primary);
    flex: 1;
}

.eai-variable-unit {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
    font-style: italic;
}

.eai-formula-example {
    margin: var(--eai-space-lg);
    padding: var(--eai-space-md);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-md);
    font-size: var(--eai-text-sm);
}

/* Case Study Registry Styles */
.eai-case-study {
    width: 100%;
}

.eai-case-header {
    background: var(--eai-gradient-primary);
    color: white;
    padding: var(--eai-space-lg);
    border-radius: var(--eai-radius-lg) var(--eai-radius-lg) 0 0;
}

.eai-case-label {
    font-size: var(--eai-text-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
    display: block;
    margin-bottom: var(--eai-space-xs);
}

.eai-case-title {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    margin: 0;
    color: white;
}

.eai-case-location {
    font-size: var(--eai-text-sm);
    opacity: 0.9;
    display: block;
    margin-top: var(--eai-space-xs);
}

.eai-case-content {
    padding: var(--eai-space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-lg);
}

.eai-case-context,
.eai-case-issues,
.eai-case-outcomes {
    padding: var(--eai-space-md);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-md);
    border: 1px solid var(--eai-border);
}

.eai-case-context h3,
.eai-case-issues h3,
.eai-case-outcomes h3 {
    font-size: var(--eai-text-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--eai-primary);
    margin: 0 0 var(--eai-space-sm) 0;
}

.eai-case-context p,
.eai-case-issues li,
.eai-case-outcomes li {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-primary);
    margin: 0;
}

.eai-case-issues ul,
.eai-case-outcomes ul {
    margin: 0;
    padding-left: var(--eai-space-lg);
}

/* Flowchart Registry Styles */
.eai-flowchart {
    width: 100%;
}

.eai-flowchart-canvas {
    padding: var(--eai-space-lg);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    overflow: auto;
}

.eai-flowchart-svg {
    width: 100%;
    min-width: 600px;
    height: auto;
}

.eai-flow-node {
    cursor: pointer;
    transition: all 0.2s ease;
}

.eai-flow-node:hover rect {
    filter: brightness(1.1);
}

/* Table Layout Registry Styles */
.eai-table-layout {
    width: 100%;
}

.eai-table-container {
    padding: var(--eai-space-lg);
    overflow-x: auto;
}

.eai-data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--eai-text-sm);
}

.eai-data-table th,
.eai-data-table td {
    padding: var(--eai-space-sm) var(--eai-space-md);
    text-align: left;
    border: 1px solid var(--eai-border);
}

.eai-data-table th {
    background: var(--eai-primary);
    color: white;
    font-weight: var(--eai-font-semibold);
}

.eai-data-table tr:nth-child(even) {
    background: var(--eai-surface-alt);
}

.eai-data-table tr:hover {
    background: var(--eai-secondary-light);
}

.eai-table-footnote {
    padding: var(--eai-space-sm) var(--eai-space-lg);
    font-size: var(--eai-text-xs);
    color: var(--eai-text-muted);
    font-style: italic;
}

/* Key Concepts Registry Styles */
.eai-key-concepts {
    width: 100%;
}

.eai-concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--eai-space-md);
    padding: var(--eai-space-lg);
}

.eai-concept-card {
    display: flex;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    border: 1px solid var(--eai-border);
    box-shadow: var(--eai-shadow-sm);
}

.eai-concept-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--eai-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

.eai-concept-content {
    flex: 1;
}

.eai-concept-title {
    font-size: var(--eai-text-base);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-concept-desc {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

/* Image Callout Registry Styles */
.eai-image-callout {
    width: 100%;
}

.eai-callout-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--eai-space-lg);
    padding: var(--eai-space-lg);
}

.eai-callout-image {
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.eai-callout-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--eai-radius-lg);
}

.eai-callout-placeholder {
    color: var(--eai-text-muted);
    font-style: italic;
}

.eai-callout-panels {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
}

.eai-callout-panel {
    display: flex;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md);
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    border-left: 4px solid var(--eai-primary);
    box-shadow: var(--eai-shadow-sm);
}

.eai-callout-marker {
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-sm);
    flex-shrink: 0;
}

.eai-callout-content h4 {
    font-size: var(--eai-text-sm);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}

.eai-callout-content p {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: 0;
}

/* Statistics Panel Registry Styles */
.eai-statistics-panel {
    width: 100%;
}

.eai-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--eai-space-md);
    padding: var(--eai-space-lg);
}

.eai-stat-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-lg);
    text-align: center;
    border: 1px solid var(--eai-border);
    box-shadow: var(--eai-shadow-sm);
    transition: all 0.2s ease;
}

.eai-stat-card:hover {
    box-shadow: var(--eai-shadow-md);
    transform: translateY(-2px);
}

.eai-stat-value {
    font-size: var(--eai-text-3xl);
    font-weight: var(--eai-font-bold);
    margin-bottom: var(--eai-space-xs);
}

.eai-stat-label {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    font-weight: var(--eai-font-medium);
}

.eai-stat-change {
    font-size: var(--eai-text-xs);
    margin-top: var(--eai-space-xs);
    font-weight: var(--eai-font-semibold);
}

.eai-stat-change.positive {
    color: var(--eai-success);
}

.eai-stat-change.negative {
    color: var(--eai-error);
}

.eai-stat-change.neutral {
    color: var(--eai-text-muted);
}

/* =====================================================
   CARD COMPONENT BASE STYLES (Used by Registry)
   ===================================================== */

.eai-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-xl);
    box-shadow: var(--eai-shadow-md);
    border: 1px solid var(--eai-border);
    overflow: hidden;
}

.eai-card-header {
    padding: var(--eai-space-md) var(--eai-space-lg);
    background: var(--eai-surface);
    border-bottom: 1px solid var(--eai-border);
}

.eai-card-title {
    font-size: var(--eai-text-xl);
    font-weight: var(--eai-font-bold);
    color: var(--eai-dark);
    margin: 0;
}

.eai-card-subtitle {
    font-size: var(--eai-text-sm);
    color: var(--eai-text-secondary);
    margin: var(--eai-space-xs) 0 0 0;
}

/* Error display */
.eai-error {
    padding: var(--eai-space-lg);
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--eai-radius-lg);
    color: #DC2626;
    font-family: var(--eai-font-family);
}

.eai-error strong {
    display: block;
    margin-bottom: var(--eai-space-xs);
}

/* =====================================================
   REGISTRY COMPONENT STYLES
   ===================================================== */

/* Process Flow (Registry) */
.eai-process-flow { width: 100%; }
.eai-process-steps {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--eai-space-md);
    align-items: stretch;
    padding: var(--eai-space-md);
}
.eai-process-step {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    padding: var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
    border: 1px solid rgba(15, 46, 92, 0.08);
}
.eai-process-step .eai-step-number {
    width: 40px;
    height: 40px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-lg);
    flex-shrink: 0;
    margin-right: var(--eai-space-md);
}
.eai-process-step .eai-step-content { flex: 1; min-width: 0; }
.eai-process-step .eai-step-title {
    font-size: var(--eai-text-sm);
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    margin: 0 0 var(--eai-space-xs) 0;
}
.eai-process-step .eai-step-desc {
    font-size: var(--eai-text-xs);
    color: var(--eai-text-secondary);
    margin: 0;
}
.eai-step-arrow {
    font-size: var(--eai-text-xl);
    color: var(--eai-primary);
    margin: 0 var(--eai-space-sm);
    font-weight: var(--eai-font-bold);
    flex-shrink: 0;
}

/* Worked Example (Registry) */
.eai-worked-example { width: 100%; }
.eai-example-steps {
    display: flex;
    flex-direction: column;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md);
}
.eai-example-step {
    display: flex;
    align-items: flex-start;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md);
    background: var(--eai-surface-alt);
    border-radius: var(--eai-radius-md);
    border-left: 3px solid var(--eai-primary);
}
.eai-step-badge {
    background: var(--eai-primary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--eai-radius-full);
    font-size: var(--eai-text-xs);
    font-weight: var(--eai-font-semibold);
    flex-shrink: 0;
}
.eai-step-action { font-size: var(--eai-text-sm); color: var(--eai-text-primary); }
.eai-step-calc {
    font-family: var(--eai-font-mono);
    background: var(--eai-surface);
    padding: var(--eai-space-sm);
    border-radius: var(--eai-radius-sm);
    margin-top: var(--eai-space-xs);
    font-size: var(--eai-text-sm);
}
.eai-step-result { font-size: var(--eai-text-sm); color: var(--eai-success); margin-top: var(--eai-space-xs); }
.eai-example-answer {
    background: var(--eai-success);
    color: white;
    padding: var(--eai-space-md);
    border-radius: var(--eai-radius-md);
    margin: var(--eai-space-md);
    font-size: var(--eai-text-sm);
}

/* Hierarchy Tree (Registry) - SVG-based for clean connections */
.eai-hierarchy-tree { width: 100%; }
.eai-tree-container {
    display: flex;
    justify-content: center;
    padding: var(--eai-space-lg);
}
.eai-tree-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}
.eai-tree-content {
    background: var(--eai-surface);
    border: 2px solid var(--eai-primary);
    border-radius: var(--eai-radius-md);
    padding: var(--eai-space-sm) var(--eai-space-md);
    box-shadow: var(--eai-shadow-sm);
    z-index: 2;
    position: relative;
}
.eai-tree-label {
    font-weight: var(--eai-font-semibold);
    color: var(--eai-text-primary);
    font-size: var(--eai-text-sm);
}
.eai-tree-children {
    display: flex;
    gap: var(--eai-space-lg);
    margin-top: var(--eai-space-lg);
    position: relative;
}
/* Vertical connector line from parent to children row */
.eai-tree-children::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--eai-space-lg));
    left: 50%;
    width: 2px;
    height: var(--eai-space-lg);
    background: var(--eai-primary);
    transform: translateX(-50%);
}
/* Horizontal connector across children */
.eai-tree-children::after {
    content: '';
    position: absolute;
    top: calc(-1 * var(--eai-space-lg));
    left: 0;
    right: 0;
    height: 2px;
    background: var(--eai-primary);
}
/* Child vertical connectors */
.eai-tree-node > .eai-tree-children > .eai-tree-node::before {
    content: '';
    position: absolute;
    top: calc(-1 * var(--eai-space-lg));
    left: 50%;
    width: 2px;
    height: var(--eai-space-lg);
    background: var(--eai-primary);
    transform: translateX(-50%);
}

/* Timeline (Registry) */
.eai-timeline { width: 100%; }
.eai-timeline-track {
    display: flex;
    gap: var(--eai-space-lg);
    padding: var(--eai-space-md);
    overflow-x: auto;
}
.eai-timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 150px;
    text-align: center;
}
.eai-timeline-dot {
    width: 16px;
    height: 16px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-primary);
    border: 3px solid white;
    box-shadow: var(--eai-shadow-md);
    margin-bottom: var(--eai-space-sm);
}
.eai-timeline-card {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-md);
    padding: var(--eai-space-sm);
    box-shadow: var(--eai-shadow-sm);
}
.eai-timeline-date { font-weight: var(--eai-font-bold); color: var(--eai-primary); font-size: var(--eai-text-sm); }
.eai-timeline-title { font-weight: var(--eai-font-semibold); font-size: var(--eai-text-sm); }
.eai-timeline-desc { font-size: var(--eai-text-xs); color: var(--eai-text-secondary); }

/* Comparison (Registry) */
.eai-comparison-split { width: 100%; }
.eai-comparison-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--eai-space-md);
    padding: var(--eai-space-md);
}
.eai-comparison-side {
    background: var(--eai-surface);
    border-radius: var(--eai-radius-lg);
    overflow: hidden;
    box-shadow: var(--eai-shadow-sm);
}
.eai-comparison-header { padding: var(--eai-space-sm); color: white; text-align: center; }
.eai-comparison-content { padding: var(--eai-space-md); }
.eai-comparison-point { display: flex; align-items: flex-start; gap: var(--eai-space-xs); margin-bottom: var(--eai-space-sm); font-size: var(--eai-text-sm); }
.eai-point-icon { color: var(--eai-success); font-weight: var(--eai-font-bold); }
.eai-comparison-vs { display: flex; align-items: center; justify-content: center; font-weight: var(--eai-font-extrabold); color: var(--eai-text-muted); }

/* Cycle Diagram (Registry) */
.eai-cycle-diagram { width: 100%; }
.eai-cycle-container { padding: var(--eai-space-md); }
.eai-cycle-svg { max-width: 100%; height: auto; }
.eai-cycle-labels { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: var(--eai-space-sm); margin-top: var(--eai-space-md); }
.eai-cycle-label { display: flex; align-items: center; gap: var(--eai-space-xs); background: var(--eai-surface-alt); padding: var(--eai-space-xs) var(--eai-space-sm); border-radius: var(--eai-radius-md); font-size: var(--eai-text-xs); }
.eai-cycle-number { width: 20px; height: 20px; border-radius: var(--eai-radius-full); background: var(--eai-primary); color: white; display: flex; align-items: center; justify-content: center; font-weight: var(--eai-font-bold); font-size: 10px; flex-shrink: 0; }

/* Sequence Ordering (Registry) */
.eai-sequence-ordering { width: 100%; }
.eai-sequence-track {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: var(--eai-space-sm);
    padding: var(--eai-space-md);
    overflow-x: auto;
}
.eai-sequence-item {
    display: flex;
    align-items: center;
    gap: var(--eai-space-sm);
    flex-shrink: 0;
}
.eai-sequence-number {
    width: 32px;
    height: 32px;
    border-radius: var(--eai-radius-full);
    background: var(--eai-gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--eai-font-bold);
    font-size: var(--eai-text-sm);
    flex-shrink: 0;
}
.eai-sequence-box {
    background: var(--eai-surface);
    border: 1px solid var(--eai-border);
    border-radius: var(--eai-radius-md);
    padding: var(--eai-space-sm) var(--eai-space-md);
    min-width: 100px;
}
.eai-sequence-title { font-weight: var(--eai-font-semibold); font-size: var(--eai-text-sm); }
.eai-sequence-desc { font-size: var(--eai-text-xs); color: var(--eai-text-secondary); }
.eai-sequence-connector { color: var(--eai-primary); font-weight: var(--eai-font-bold); font-size: var(--eai-text-lg); }

/* Quote Analysis (Registry) */
.eai-quote-analysis { width: 100%; }
.eai-quote-text { font-style: italic; padding: var(--eai-space-md); background: var(--eai-surface-alt); border-radius: var(--eai-radius-md); }
.eai-quote-annotations { display: flex; flex-direction: column; gap: var(--eai-space-sm); padding: var(--eai-space-md); }
.eai-annotation { display: flex; align-items: center; gap: var(--eai-space-sm); padding: var(--eai-space-sm); background: var(--eai-surface); border-radius: var(--eai-radius-md); }
.eai-annotation-highlight { padding: 2px 8px; border-radius: var(--eai-radius-sm); font-weight: var(--eai-font-semibold); font-size: var(--eai-text-xs); }
.eai-annotation-note { font-size: var(--eai-text-xs); color: var(--eai-text-secondary); }

/* Cause & Effect (Registry) */
.eai-cause-effect { width: 100%; }
.eai-cause-effect-layout { display: grid; grid-template-columns: 1fr auto 1fr; gap: var(--eai-space-md); padding: var(--eai-space-md); }
.eai-causes-column, .eai-effects-column { display: flex; flex-direction: column; gap: var(--eai-space-sm); }
.eai-column-title { font-size: var(--eai-text-sm); font-weight: var(--eai-font-bold); color: var(--eai-dark); margin-bottom: var(--eai-space-sm); }
.eai-cause-item, .eai-effect-item { display: flex; align-items: center; gap: var(--eai-space-xs); padding: var(--eai-space-sm); background: var(--eai-surface-alt); border-radius: var(--eai-radius-md); font-size: var(--eai-text-xs); }
.eai-cause-arrow, .eai-effect-arrow { color: var(--eai-primary); }
.eai-central-node { background: var(--eai-gradient-primary); color: white; padding: var(--eai-space-md); border-radius: var(--eai-radius-lg); text-align: center; font-weight: var(--eai-font-bold); font-size: var(--eai-text-sm); }

/* Formula Breakdown (Registry) */
.eai-formula-breakdown { width: 100%; }
.eai-formula-display { text-align: center; padding: var(--eai-space-lg); }
.eai-formula-main { font-family: var(--eai-font-mono); font-size: var(--eai-text-2xl); color: var(--eai-primary); font-weight: var(--eai-font-bold); }
.eai-variables-list { display: flex; flex-direction: column; gap: var(--eai-space-sm); padding: var(--eai-space-md); }
.eai-variable-item { display: flex; align-items: center; gap: var(--eai-space-sm); padding: var(--eai-space-sm); background: var(--eai-surface-alt); border-radius: var(--eai-radius-md); }
.eai-variable-symbol { font-family: var(--eai-font-mono); font-weight: var(--eai-font-bold); color: var(--eai-primary); }
.eai-variable-name { font-size: var(--eai-text-sm); }
.eai-variable-unit { font-size: var(--eai-text-xs); color: var(--eai-text-muted); }

/* Key Concepts (Registry) */
.eai-key-concepts { width: 100%; }

/* Ensure all number badges have visible contrast */
.eai-step-number, .eai-sequence-number, .eai-cycle-number, .eai-label-number {
    background: var(--eai-gradient-primary) !important;
    color: white !important;
}