/* AI Tools Seminar Presentation Styles */

/* CSS Variables for theming - Light Mode (Default) */
:root {
    /* Semantic color system */
    --color-primary: #2563eb;
    --color-secondary: #1e40af;
    --color-accent: #3b82f6;
    --color-background: #ffffff;
    --color-surface: #f9fafb;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Shadow and overlay opacity */
    --shadow-opacity: 0.1;
    --overlay-opacity: 0.95;
    
    /* Theme transition duration */
    --theme-transition: 250ms ease-in-out;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-background);
    overflow: hidden;
    transition: background-color var(--theme-transition), color var(--theme-transition);
}

/* Presentation container */
.presentation-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Slide navigation */
.slide-nav {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, var(--overlay-opacity));
    backdrop-filter: blur(10px);
    border-radius: 8px;
    padding: var(--spacing-sm);
    box-shadow: 0 4px 6px rgba(0, 0, 0, var(--shadow-opacity));
    z-index: 1000;
    transition: background-color var(--theme-transition), box-shadow var(--theme-transition);
}

[data-theme="dark"] .slide-nav {
    background: rgba(15, 23, 42, var(--overlay-opacity));
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .slide-nav {
        background: rgba(15, 23, 42, var(--overlay-opacity));
    }
}

.nav-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 6px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition-fast), background-color var(--theme-transition);
}

.nav-btn:hover {
    background: var(--color-secondary);
    transform: translateY(-1px);
}

.nav-btn:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.nav-btn:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
    transform: none;
}

#theme-toggle {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

#theme-toggle:hover {
    background: var(--color-border);
    transform: translateY(-1px);
}

.slide-counter {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    min-width: 60px;
    text-align: center;
    transition: color var(--theme-transition);
}

/* Slides container */
.slides-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Individual slides */
.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateX(100%);
    transition: all var(--transition-normal);
    padding: var(--spacing-2xl);
}

.slide.active {
    opacity: 1;
    transform: translateX(0);
}

.slide.prev {
    transform: translateX(-100%);
}

/* Slide content */
.slide-content {
    max-width: 1000px;
    width: 100%;
    text-align: center;
}

/* Typography */
.slide h1 {
    font-size: clamp(3rem, 6vw, 4.5rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.slide h2 {
    font-size: clamp(2.2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.slide h3 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.slide p {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* Title slide styles */
.slide-title {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.slide-subtitle {
    color: var(--color-text);
    font-weight: 400;
}

.slide-meta {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Section title slides */
.section-title {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.section-title .slide-content {
    text-align: left;
}

.section-number {
    font-size: 8rem;
    font-weight: 900;
    opacity: 0.3;
    position: absolute;
    top: -2rem;
    left: -1rem;
    z-index: -1;
}

.section-title h1,
.section-title h2 {
    color: white;
}

/* Overview grid */
.overview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    text-align: left;
}

.overview-item h3 {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.overview-item ul {
    list-style: none;
    padding: 0;
}

.overview-item li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.overview-item li:last-child {
    border-bottom: none;
}

/* Agenda styles */
.agenda-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: left;
}

.agenda-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition-normal);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
}

.agenda-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.agenda-number {
    width: 70px;
    height: 70px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.agenda-content h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    font-size: 1.6rem;
}

.agenda-content p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 1.2rem;
    line-height: 1.5;
}

/* Content grid layouts */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    text-align: left;
}

.content-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.highlight-text {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-primary);
    line-height: 1.4;
}

/* Fear to empowerment transformation */
.fear-to-empowerment {
    margin-top: var(--spacing-xl);
}

.transformation-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.from-section,
.to-section {
    flex: 1;
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: 8px;
}

.from-section {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--color-error);
}

.to-section {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--color-success);
}

.arrow {
    font-size: 2rem;
    color: var(--color-primary);
    font-weight: bold;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.benefit-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
    text-align: left;
}

.benefit-item h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

/* Best practices grid */
.best-practices {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.practice-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
    transition: var(--transition-normal);
}

.practice-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.practice-item h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.key-message {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    padding: var(--spacing-lg);
    border-radius: 8px;
    text-align: center;
    font-size: 1.1rem;
    margin-top: var(--spacing-xl);
}

/* Presenter notes */
.presenter-notes {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--dark-surface);
    color: var(--dark-text-primary);
    padding: var(--spacing-md);
    transform: translateY(100%);
    transition: var(--transition-normal);
    z-index: 1001;
    max-height: 30vh;
    overflow-y: auto;
}

.presenter-notes.show {
    transform: translateY(0);
}

.notes-content h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

/* Categories comparison styles */
.categories-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.category-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.category-item h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.4rem;
}

.category-details p {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

/* Model grid styles */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: left;
}

.model-category {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.model-category h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.model-category ul {
    list-style: none;
    padding: 0;
}

.model-category li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.model-category li:last-child {
    border-bottom: none;
}

/* Cost breakdown styles */
.cost-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    text-align: left;
}

.pricing-table,
.cost-tips {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.pricing-table table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.pricing-table td {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.cost-tips ul {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-md);
}

.cost-tips li {
    padding: var(--spacing-sm) 0;
    position: relative;
    padding-left: var(--spacing-lg);
}

.cost-tips li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

/* Platforms grid styles */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.platform-card {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
    transition: var(--transition-normal);
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.platform-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.3rem;
}

.platform-card p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

/* Comparison table styles */
.comparison-table {
    margin: var(--spacing-xl) 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
    background: var(--color-primary);
    color: white;
    font-weight: 600;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.security-note {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    text-align: center;
}

/* Customization grid styles */
.customization-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.feature-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.feature-card code {
    background: rgba(59, 130, 246, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.feature-card ul {
    list-style: none;
    padding: 0;
    margin-top: var(--spacing-sm);
}

.feature-card li {
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: var(--spacing-md);
}

.feature-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Setup steps styles */
.setup-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.step-content p {
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Key takeaways styles */
.takeaways-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.takeaway-item {
    background: var(--color-surface);
    padding: var(--spacing-2xl);
    border-radius: 16px;
    border: 2px solid var(--color-border);
    text-align: center;
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    min-height: 240px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.takeaway-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.takeaway-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--color-primary);
}

.takeaway-item h3 {
    color: var(--color-text);
    margin: 0;
    font-size: 1.8rem;
    font-weight: 600;
    line-height: 1.3;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.takeaway-item h3::first-letter {
    font-size: 2.5rem;
}

.takeaway-item p {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 1.3rem;
    line-height: 1.5;
    font-weight: 400;
    max-width: 280px;
}

/* Next steps styles */
.next-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.step-category {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 2px solid var(--color-border);
    text-align: left;
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    flex-direction: column;
}

.step-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.step-category:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    border-color: var(--color-primary);
}

.step-category h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 1.3;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-sm);
}

.step-category ul {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.step-category li {
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text-muted);
    padding-top: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-radius: 6px;
    transition: var(--transition-fast);
}

.step-category li::before {
    content: "→";
    position: absolute;
    left: 0;
    top: var(--spacing-xs);
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.1rem;
    transition: var(--transition-fast);
}

.step-category li:hover {
    background: rgba(37, 99, 235, 0.05);
    padding-left: calc(var(--spacing-lg) + 3px);
}

.step-category li:hover::before {
    color: var(--color-accent);
    transform: translateX(3px);
}

.step-category code {
    background: rgba(59, 130, 246, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 500;
}

/* Thank you slide styles */
.contact-info {
    max-width: 900px;
    margin: var(--spacing-2xl) auto 0;
    text-align: center;
}

.thank-you-message {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #ffffff !important;
    padding: var(--spacing-xl);
    border-radius: 16px;
    font-size: 1.3rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-2xl);
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.2);
    font-style: italic;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.resources {
    background: var(--color-surface);
    border-radius: 16px;
    border: 2px solid var(--color-border);
    padding: var(--spacing-2xl);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.resources::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.resources h3 {
    color: var(--color-text);
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-md);
}

.resources ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    text-align: left;
}

.resources li {
    background: rgba(37, 99, 235, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: var(--transition-normal);
    position: relative;
}

.resources li:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--color-primary);
}

.resources li::before {
    content: "🔗";
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.2rem;
    opacity: 0.6;
    transition: var(--transition-fast);
}

.resources li:hover::before {
    opacity: 1;
    transform: scale(1.1);
}

.resources a {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.5;
    display: block;
    transition: var(--transition-fast);
}

.resources a:hover {
    color: var(--color-accent);
    text-decoration: underline;
}

.resources a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Dark Mode Variables */
:root[data-theme="dark"] {
    --color-primary: #3b82f6;
    --color-secondary: #2563eb;
    --color-accent: #60a5fa;
    --color-background: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    
    /* Adjusted opacity for dark mode */
    --shadow-opacity: 0.3;
    --overlay-opacity: 0.9;
}

/* System preference detection with fallback */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-primary: #3b82f6;
        --color-secondary: #2563eb;
        --color-accent: #60a5fa;
        --color-background: #0f172a;
        --color-surface: #1e293b;
        --color-text: #f1f5f9;
        --color-text-muted: #94a3b8;
        --color-border: #334155;
        --color-success: #34d399;
        --color-warning: #fbbf24;
        --color-error: #f87171;
        
        --shadow-opacity: 0.3;
        --overlay-opacity: 0.9;
    }
}

/* Fallback colors for browsers without custom property support */
@supports not (color: var(--color-background)) {
    body { background: #ffffff; color: #1f2937; }
    @media (prefers-color-scheme: dark) {
        body { background: #0f172a; color: #f1f5f9; }
    }
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .slide h1 {
        font-size: 2.5rem;
    }
    
    .slide h2 {
        font-size: 1.8rem;
    }
    
    .slide h3 {
        font-size: 1.4rem;
    }
    
    .slide p {
        font-size: 1.1rem;
    }
    
    .takeaways-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .takeaway-item {
        min-height: 200px;
        padding: var(--spacing-xl);
    }
    
    .takeaway-item h3 {
        font-size: 1.5rem;
    }
      .takeaway-item p {
        font-size: 1.1rem;
    }
      .next-steps {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .step-category {
        min-height: 160px;
        padding: var(--spacing-md);
    }
    
    .step-category h3 {
        font-size: 1.2rem;
    }
      .step-category li {
        font-size: 0.95rem;
    }
    
    .thank-you-message {
        font-size: 1.1rem;
        padding: var(--spacing-lg);
    }
    
    .resources {
        padding: var(--spacing-lg);
    }
    
    .resources h3 {
        font-size: 1.5rem;
    }
    
    .resources ul {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .resources a {
        font-size: 1rem;
    }
    
    .comparison-grid,
    .feature-grid,
    .ide-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .categories-comparison {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .model-grid {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .controls {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .slide-counter {
        order: 3;
        width: 100%;
        text-align: center;
        margin-top: var(--spacing-sm);
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .slide h1 {
        font-size: 2rem;
    }
    
    .slide h2 {
        font-size: 1.5rem;
    }
    
    .slide h3 {
        font-size: 1.2rem;
    }
    
    .slide p {
        font-size: 1rem;
    }
    
    .container {
        padding: var(--spacing-sm);
    }
    
    .controls button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .takeaway-item h3 {
        font-size: 1.3rem;
    }
      .takeaway-item p {
        font-size: 1rem;
    }
      .step-category h3 {
        font-size: 1.1rem;
    }
      .step-category li {
        font-size: 0.9rem;
    }
    
    .thank-you-message {
        font-size: 1rem;
        padding: var(--spacing-md);
    }
    
    .resources h3 {
        font-size: 1.3rem;
    }
    
    .resources a {
        font-size: 0.95rem;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    /* Keep theme transitions smooth but shorter */
    :root {
        --theme-transition: 100ms ease-in-out;
    }
}

/* Enhanced focus states for accessibility */
*:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Better focus for interactive elements */
button:focus,
a:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Focus within for containers */
.slide:focus-within {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --shadow-opacity: 0.8;
    }
    
    [data-theme="dark"] {
        --color-border: #ffffff;
    }
}

/* Print styles for presenter notes */
@media print {
    .controls,
    .presenter-notes {
        display: none !important;
    }
    
    .slide {
        page-break-inside: avoid;
    }
}