/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS Custom Properties (Variables) for consistent theming */
:root {
    --primary-color: #4f46e5;
    --secondary-color: #06b6d4;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background: #ffffff;
    --surface: #f9fafb;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --border-radius: 0.5rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

/* Typography */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border);
    padding-bottom: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

/* Layout Components */
body {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

header {
    text-align: center;
    background: linear-gradient(135deg, var(--surface) 0%, #e0e7ff 100%);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border);
}

header h1 {
    margin-bottom: var(--spacing-xs);
}

header p {
    font-size: 1.2rem;
    color: var(--accent-color);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

main {
    background: var(--background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-xl);
}

section {
    margin-bottom: var(--spacing-xl);
}

/* Lists */
ul, ol {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

dl {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

dt {
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-sm);
}

dd {
    margin-left: var(--spacing-md);
    color: var(--text-secondary);
}

/* Special Components */
.highlight-box {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    position: relative;
}

.highlight-box::before {
    content: '💡';
    position: absolute;
    top: -10px;
    left: var(--spacing-md);
    background: var(--accent-color);
    padding: var(--spacing-xs);
    border-radius: 50%;
    font-size: 1.2rem;
}

/* Grid Layouts */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.comparison-item {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.comparison-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.feature-item {
    background: linear-gradient(135deg, var(--surface), #f0f9ff);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.feature-item:hover {
    border-left-color: var(--secondary-color);
    transform: translateX(5px);
}

.importance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
}

.importance-item {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.importance-item:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.importance-item:hover h3,
.importance-item:hover p {
    color: white;
}

/* Card Components */
.concept-card {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    position: relative;
    overflow: hidden;
}

.concept-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

/* Animated Elements */
.animated-element {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    margin: var(--spacing-lg) 0;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.animated-element::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.animated-element:hover::before {
    left: 100%;
}

.animated-element:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.animated-element p {
    color: white;
    font-weight: 500;
    font-size: 1.1rem;
    margin: 0;
}

/* Quote Styling */
.css-quote {
    background: linear-gradient(135deg, #eef2ff, #ddd6fe);
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-style: italic;
    position: relative;
}

.css-quote::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary-color);
    position: absolute;
    top: -10px;
    left: var(--spacing-md);
    opacity: 0.3;
}

blockquote p {
    color: var(--text-primary);
    font-size: 1.1rem;
}

/* Links */
a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

a:hover::after {
    width: 100%;
}

a:hover {
    color: var(--primary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--surface);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    margin-top: var(--spacing-xl);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    body {
        padding: var(--spacing-sm);
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .comparison-grid,
    .features-list {
        grid-template-columns: 1fr;
    }
    
    .importance-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

/* Animation Keyframes */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Apply fade-in animation to sections */
section {
    animation: fadeIn 0.6s ease-out;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Additional CSS for JavaScript-enhanced features */

/* Theme system for dark/light mode toggle */
:root.dark-theme {
    --primary-color: #818cf8;
    --secondary-color: #06d6a0;
    --accent-color: #ffd60a;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --background: #0f172a;
    --surface: #1e293b;
    --border: #334155;
}

body.dark-mode {
    background-color: var(--background);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

/* Theme controls */
.theme-controls {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.theme-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.theme-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

/* Interactive demo section */
.interactive-demo {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.demo-controls {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin: var(--spacing-md) 0;
}

.demo-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.demo-btn:hover {
    transform: scale(1.05);
    background: #f59e0b;
}

.demo-btn:active {
    transform: scale(0.95);
}

/* Magic box animations */
.magic-box {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4);
    background-size: 400% 400%;
    animation: gradientFlow 4s ease infinite;
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    transition: all 0.3s ease;
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.magic-box.magical {
    animation: magicalPulse 1s ease-in-out infinite alternate, gradientFlow 2s ease infinite;
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(255, 107, 107, 0.5);
}

@keyframes magicalPulse {
    from { box-shadow: 0 0 30px rgba(255, 107, 107, 0.5); }
    to { box-shadow: 0 0 50px rgba(255, 107, 107, 0.8), 0 0 70px rgba(78, 205, 196, 0.6); }
}

/* Counter display */
.counter-display {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 1.5rem;
    font-weight: bold;
    margin: var(--spacing-md) 0;
    transition: all 0.3s ease;
}

.counter-display.counting {
    animation: counterPulse 0.5s ease-in-out;
}

@keyframes counterPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Toggle content sections */
.toggle-content {
    margin: var(--spacing-lg) 0;
}

.toggle-btn {
    background: var(--surface);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    width: 100%;
    text-align: left;
}

.toggle-btn:hover {
    background: var(--primary-color);
    color: white;
}

.toggle-section {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-sm);
    border: 1px solid var(--border);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        padding: 0 var(--spacing-md);
    }
    to {
        opacity: 1;
        max-height: 500px;
        padding: var(--spacing-md);
    }
}

/* Live clock widget */
.clock-widget {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.clock-display {
    font-size: 2.5rem;
    font-weight: bold;
    font-family: 'Courier New', monospace;
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin: var(--spacing-sm) 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Pillars demo */
.pillars-demo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.pillar-item {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.pillar-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.pillar-item.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.pillar-item.active h3,
.pillar-item.active p {
    color: white;
}

.pillar-description {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--border);
}

/* Comparison interactive */
.comparison-interactive {
    background: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
    border: 1px solid var(--border);
}

.comparison-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin: var(--spacing-md) 0;
}

.comparison-btn {
    background: var(--border);
    color: var(--text-secondary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.comparison-btn.active,
.comparison-btn:hover {
    background: var(--primary-color);
    color: white;
}

.comparison-result {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--secondary-color);
    margin-top: var(--spacing-md);
}

/* Interactive features grid */
.features-interactive {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.feature-card {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.feature-demo-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
    transition: all 0.3s ease;
}

.feature-demo-btn:hover {
    background: var(--primary-color);
    transform: scale(1.05);
}

.feature-demo-result {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-md);
    border: 1px solid var(--border);
    text-align: center;
}

/* Interactive learning section */
.interactive-learning {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.code-example,
.quiz-section {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.code-display {
    background: #1e293b;
    color: #e2e8f0;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
}

.run-code-btn {
    background: #10b981;
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.run-code-btn:hover {
    background: #059669;
    transform: scale(1.02);
}

.code-result {
    background: white;
    border: 2px solid var(--border);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-sm);
    text-align: center;
    font-weight: 500;
    transition: all 0.3s ease;
}

/* Quiz section */
.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.quiz-btn {
    background: var(--surface);
    color: var(--text-primary);
    border: 2px solid var(--border);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.quiz-btn.correct {
    background: #10b981;
    border-color: #10b981;
    color: white;
}

.quiz-btn.incorrect {
    background: #ef4444;
    border-color: #ef4444;
    color: white;
}

/* Rotating facts */
.rotating-reasons {
    background: linear-gradient(135deg, var(--accent-color), #fbbf24);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.rotating-fact {
    font-size: 1.2rem;
    font-weight: 500;
    margin: var(--spacing-md) 0;
    min-height: 3em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.next-fact-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.next-fact-btn:hover {
    background: white;
    color: var(--accent-color);
}

/* Importance showcase */
.importance-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.importance-item-js {
    background: var(--surface);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.importance-item-js:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.importance-item-js:hover h3,
.importance-item-js:hover p {
    color: white;
}

/* Celebration section */
.celebration-section {
    text-align: center;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    margin: var(--spacing-lg) 0;
}

.celebrate-btn {
    background: linear-gradient(135deg, #ff6b6b, #4ecdc4);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.celebrate-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.6);
}

.celebration-area {
    margin-top: var(--spacing-md);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

/* Progress tracker */
.next-steps {
    margin-top: var(--spacing-xl);
}

.progress-tracker {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.progress-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    flex: 1;
    min-width: 120px;
}

.progress-item.completed {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid #10b981;
}

.progress-item.next {
    background: rgba(79, 70, 229, 0.1);
    border: 2px solid var(--primary-color);
    animation: nextStepPulse 2s ease-in-out infinite alternate;
}

.progress-item.future {
    background: rgba(107, 114, 128, 0.1);
    border: 2px solid var(--text-secondary);
    opacity: 0.7;
}

@keyframes nextStepPulse {
    from { transform: scale(1); }
    to { transform: scale(1.02); box-shadow: 0 0 15px rgba(79, 70, 229, 0.3); }
}

.progress-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

/* Footer enhancements */
.footer-stats {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border);
}

.footer-stats p {
    font-size: 0.8rem;
    margin: var(--spacing-xs) 0;
}

/* Animations for various interactions */
.bounce {
    animation: bounce 0.5s ease-in-out;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.glow {
    box-shadow: 0 0 20px rgba(79, 70, 229, 0.5);
    animation: glow 1s ease-in-out infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 20px rgba(79, 70, 229, 0.5); }
    to { box-shadow: 0 0 30px rgba(79, 70, 229, 0.8), 0 0 40px rgba(6, 182, 212, 0.5); }
}

.spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

.slide-in {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive enhancements */
@media (max-width: 768px) {
    .interactive-learning {
        grid-template-columns: 1fr;
    }
    
    .quiz-options {
        grid-template-columns: 1fr;
    }
    
    .progress-tracker {
        flex-direction: column;
    }
    
    .theme-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .demo-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .comparison-buttons {
        flex-direction: column;
        align-items: center;
    }
}