/* ============================================================
   DISTRIBUTED TRAINING PRESENTATION - UNIFIED DESIGN SYSTEM
   Modern, Professional Theme for Technical Presentations
   Version 2.0 - Enhanced & Unified
   ============================================================ */

/* ============================================================
   1. CSS RESET & BASE STYLES
   ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Professional Dark Theme */
    --color-bg-primary: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-bg-card: rgba(45, 45, 45, 0.6);
    --color-bg-card-hover: rgba(55, 55, 55, 0.7);
    --color-bg-elevated: rgba(45, 45, 45, 0.8);

    /* Text Colors */
    --color-text-primary: #f0f0f0;
    --color-text-secondary: #e8e8e8;
    --color-text-tertiary: #a8a8a8;
    --color-text-muted: #888888;
    --color-text-white: #ffffff;

    /* Accent Colors */
    --color-accent-primary: #4a9eff;
    --color-accent-success: #2ed573;
    --color-accent-warning: #ff6b6b;
    --color-accent-attention: #ffb800;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4a9eff 0%, #357abd 100%);
    --gradient-success: linear-gradient(135deg, #2ed573 0%, #24a85f 100%);
    --gradient-warning: linear-gradient(135deg, #ff6b6b 0%, #e34f4f 100%);
    --gradient-card: linear-gradient(135deg, rgba(74, 158, 255, 0.05) 0%, transparent 100%);

    /* Borders */
    --color-border: rgba(74, 158, 255, 0.2);
    --color-border-hover: rgba(74, 158, 255, 0.4);
    --color-border-active: #4a9eff;

    /* Spacing Scale (4px base) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;
    --space-9: 80px;
    --space-10: 96px;

    /* Typography Scale */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Courier New', monospace;

    --font-size-xs: 0.85rem;
    --font-size-sm: 1rem;
    --font-size-base: 1.125rem;
    --font-size-md: 1.5rem;
    --font-size-lg: 1.8rem;
    --font-size-xl: 2.5rem;
    --font-size-2xl: 3rem;
    --font-size-3xl: 3.5rem;
    --font-size-4xl: 4.5rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 18px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.7);

    /* Glow Effects */
    --glow-primary: 0 0 20px rgba(74, 158, 255, 0.4);
    --glow-primary-lg: 0 0 40px rgba(74, 158, 255, 0.6);
    --glow-success: 0 0 20px rgba(46, 213, 115, 0.4);
    --glow-warning: 0 0 20px rgba(255, 107, 107, 0.4);
    --shadow-glow: 0 0 20px rgba(74, 158, 255, 0.3);

    /* Animation Timing */
    --timing-micro: 150ms;
    --timing-fast: 200ms;
    --timing-quick: 300ms;
    --timing-normal: 300ms;
    --timing-smooth: 600ms;
    --timing-slow: 500ms;
    --timing-slower: 800ms;

    /* Easing Functions */
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-decelerate: cubic-bezier(0, 0, 0.2, 1);
    --ease-accelerate: cubic-bezier(0.4, 0, 1, 1);
    --ease-bounce: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-overshoot: cubic-bezier(0.16, 1, 0.3, 1);

    /* Backdrop Blur */
    --blur-sm: blur(8px);
    --blur-md: blur(12px);
    --blur-lg: blur(16px);

    /* Z-index Scale */
    --z-base: 0;
    --z-elevated: 10;
    --z-sticky: 100;
    --z-fixed: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

body {
    font-family: var(--font-family-primary);
    background: var(--color-bg-primary);
    background-image: radial-gradient(circle at 20% 50%, rgba(74, 158, 255, 0.06) 0%, transparent 50%),
                      radial-gradient(circle at 80% 80%, rgba(74, 158, 255, 0.04) 0%, transparent 50%);
    color: var(--color-text-secondary);
    overflow: hidden;
    height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: var(--line-height-normal);
    font-size: var(--font-size-base);
}

/* ============================================================
   2. TYPOGRAPHY SYSTEM
   ============================================================ */

.page-title {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-white);
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
    text-shadow: var(--glow-primary);
}

.page-subtitle {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    color: var(--color-accent-primary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--space-5);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-white);
    margin-bottom: var(--space-5);
    letter-spacing: -0.01em);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-white);
    margin-bottom: var(--space-4);
}

.body-text {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.small-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-normal);
}

.code-text {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-sm);
    color: var(--color-accent-primary);
    background: rgba(74, 158, 255, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

/* Typography Utilities */
.text-xl {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    line-height: var(--line-height-tight);
}

.text-lg {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.01em;
    line-height: var(--line-height-tight);
}

.text-md {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
}

.text-base {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-relaxed);
}

.text-sm {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
}

/* Text Colors */
.text-highlight {
    color: var(--color-accent-primary);
    font-weight: var(--font-weight-semibold);
}

.text-success {
    color: var(--color-accent-success);
}

.text-warning {
    color: var(--color-accent-warning);
}

/* ============================================================
   3. LAYOUT SYSTEM
   ============================================================ */

.slide-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100vw;
    padding: var(--space-8);
    position: relative;
    overflow: hidden;
}

.slide-container-top {
    justify-content: flex-start;
    padding-top: calc(var(--space-10) + 60px);
}

.content-wrapper {
    max-width: 1200px;
    width: 100%;
    position: relative;
    z-index: var(--z-elevated);
}

.content-wrapper-narrow {
    max-width: 900px;
}

.content-wrapper-wide {
    max-width: 1400px;
}

/* Split Layout */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: center;
    width: 100%;
}

.split-layout-left {
    padding-right: var(--space-5);
}

.split-layout-right {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Centered Content */
.centered-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

/* Text Block */
.text-block {
    font-size: var(--font-size-md);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    opacity: 0;
    transform: translateY(24px);
    transition: all var(--timing-smooth) var(--ease-decelerate);
}

.text-block.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   4. CARD SYSTEM
   ============================================================ */

.card {
    background: var(--color-bg-card);
    backdrop-filter: var(--blur-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-md);
    transition: all var(--timing-normal) var(--ease-standard);
}

.card:hover {
    background: var(--color-bg-card-hover);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg), var(--glow-primary);
    transform: translateY(-4px);
}

.card-interactive {
    cursor: pointer;
}

.card-success {
    border-color: rgba(46, 213, 115, 0.3);
    background: linear-gradient(135deg, rgba(46, 213, 115, 0.05) 0%, var(--color-bg-card) 100%);
}

.card-success:hover {
    border-color: rgba(46, 213, 115, 0.5);
    box-shadow: var(--shadow-lg), var(--glow-success);
}

.card-warning {
    border-color: rgba(255, 107, 107, 0.3);
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.05) 0%, var(--color-bg-card) 100%);
}

.card-warning:hover {
    border-color: rgba(255, 107, 107, 0.5);
    box-shadow: var(--shadow-lg), var(--glow-warning);
}

.card-compact {
    padding: var(--space-5);
}

.card-spacious {
    padding: var(--space-8);
}

/* Card Grid */
.card-grid {
    display: grid;
    gap: var(--space-6);
}

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

.card-grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* Memory Visualizations */
.memory-item {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6) var(--space-7);
    transition: all var(--timing-quick) var(--ease-standard);
    backdrop-filter: var(--blur-sm);
}

.memory-item:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.memory-item.highlight {
    border-color: var(--color-border-active);
    background: rgba(74, 158, 255, 0.15);
    box-shadow: 0 0 24px rgba(74, 158, 255, 0.3);
}

/* Calculation Boxes */
.calculation-box {
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    font-family: var(--font-family-mono);
    opacity: 0;
    transform: translateY(24px);
    transition: all var(--timing-smooth) var(--ease-decelerate);
}

.calculation-box.visible {
    opacity: 1;
    transform: translateY(0);
}

.calculation-line {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: var(--space-2) 0;
    padding-left: var(--space-5);
}

.calculation-result {
    color: var(--color-accent-primary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-md);
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

/* ============================================================
   5. LISTS & BULLET POINTS
   ============================================================ */

.feature-list {
    list-style: none;
    padding: 0;
    margin: var(--space-6) 0;
}

.feature-list-item {
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    background: var(--color-bg-card);
    border-left: 4px solid var(--color-accent-primary);
    border-radius: var(--radius-md);
    transition: all var(--timing-normal) var(--ease-standard);
}

.feature-list-item:hover {
    background: var(--color-bg-card-hover);
    border-left-color: var(--color-accent-primary);
    padding-left: calc(var(--space-5) + 8px);
    box-shadow: var(--shadow-sm), var(--glow-primary);
}

.feature-list-item::before {
    content: '▸';
    color: var(--color-accent-primary);
    font-weight: var(--font-weight-bold);
    margin-right: var(--space-4);
    font-size: 1.2em;
}

.numbered-list {
    list-style: none;
    counter-reset: item-counter;
    padding: 0;
    margin: var(--space-6) 0;
}

.numbered-list-item {
    counter-increment: item-counter;
    padding: var(--space-5);
    padding-left: calc(var(--space-6) + var(--space-5));
    margin-bottom: var(--space-4);
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    position: relative;
    transition: all var(--timing-normal) var(--ease-standard);
}

.numbered-list-item::before {
    content: counter(item-counter);
    position: absolute;
    left: var(--space-5);
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-white);
    font-size: var(--font-size-sm);
    box-shadow: var(--glow-primary);
}

.numbered-list-item:hover {
    background: var(--color-bg-card-hover);
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

/* ============================================================
   6. BUTTONS & INTERACTIVE ELEMENTS
   ============================================================ */

.btn {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--timing-normal) var(--ease-standard);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.btn:hover {
    background: var(--gradient-primary);
    border-color: var(--color-accent-primary);
    color: var(--color-text-white);
    box-shadow: var(--shadow-md), var(--glow-primary);
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--gradient-primary);
    border-color: var(--color-accent-primary);
    color: var(--color-text-white);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg), var(--glow-primary-lg);
    transform: translateY(-4px);
}

/* ============================================================
   7. ANIMATIONS - ENTRANCE EFFECTS
   ============================================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-32px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(32px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Animation Classes */
.animate-fade-in-up {
    animation: fadeInUp var(--timing-slower) var(--ease-overshoot) forwards;
}

.animate-fade-in-down {
    animation: fadeInDown var(--timing-slower) var(--ease-overshoot) forwards;
}

.animate-fade-in-left {
    animation: fadeInLeft var(--timing-slower) var(--ease-overshoot) forwards;
}

.animate-fade-in-right {
    animation: fadeInRight var(--timing-slower) var(--ease-overshoot) forwards;
}

.animate-fade-in-scale {
    animation: fadeInScale var(--timing-slower) var(--ease-overshoot) forwards;
}

.animate-fade-in {
    animation: fadeIn var(--timing-slower) var(--ease-standard) forwards;
}

/* Delay Classes */
.delay-0 { animation-delay: 0ms; }
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-400 { animation-delay: 400ms; }
.delay-500 { animation-delay: 500ms; }
.delay-600 { animation-delay: 600ms; }
.delay-700 { animation-delay: 700ms; }
.delay-800 { animation-delay: 800ms; }
.delay-1000 { animation-delay: 1000ms; }

/* Initial Hidden State */
.animate-hidden {
    opacity: 0;
}

/* ============================================================
   8. ANIMATIONS - CONTINUOUS EFFECTS
   ============================================================ */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: var(--glow-primary);
    }
    50% {
        box-shadow: var(--glow-primary-lg);
    }
}

@keyframes glow-pulse {
    0%, 100% {
        box-shadow: var(--glow-primary);
    }
    50% {
        box-shadow: var(--glow-primary-lg);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

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

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* Animation Classes */
.animate-pulse {
    animation: pulse 2s var(--ease-standard) infinite;
}

.animate-glow-pulse {
    animation: glow-pulse 2s var(--ease-standard) infinite;
}

.animate-float {
    animation: float 3s var(--ease-standard) infinite;
}

.animate-rotate {
    animation: rotate 2s linear infinite;
}

/* ============================================================
   9. VISUALIZATIONS - COMMON PATTERNS
   ============================================================ */

/* Neurons */
.neuron {
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border: 2px solid rgba(74, 158, 255, 0.5);
    border-radius: var(--radius-full);
    box-shadow: var(--glow-primary);
    transition: all var(--timing-normal) var(--ease-standard);
}

.neuron:hover {
    transform: scale(1.3);
    box-shadow: var(--glow-primary-lg);
}

.neuron-large {
    width: 40px;
    height: 40px;
}

/* Connection Lines */
.connection-line {
    stroke: var(--color-accent-primary);
    stroke-width: 2px;
    opacity: 0.5;
    transition: all var(--timing-normal) var(--ease-standard);
}

.connection-line-active {
    opacity: 1;
    stroke-width: 3px;
    filter: drop-shadow(0 0 8px rgba(74, 158, 255, 0.8));
}

/* Progress Bars */
.progress-bar {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--timing-slow) var(--ease-standard);
    box-shadow: var(--glow-primary);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: rgba(74, 158, 255, 0.15);
    border: 1px solid rgba(74, 158, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-accent-primary);
}

.badge-success {
    background: rgba(46, 213, 115, 0.15);
    border-color: rgba(46, 213, 115, 0.3);
    color: var(--color-accent-success);
}

.badge-warning {
    background: rgba(255, 107, 107, 0.15);
    border-color: rgba(255, 107, 107, 0.3);
    color: var(--color-accent-warning);
}

/* ============================================================
   10. PROS/CONS LAYOUT
   ============================================================ */

.pros-cons-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.pros-card {
    background: linear-gradient(135deg, rgba(46, 213, 115, 0.08) 0%, var(--color-bg-card) 100%);
    border-color: rgba(46, 213, 115, 0.3);
}

.pros-card .card-title::before {
    content: '✓ ';
    color: var(--color-accent-success);
    font-size: 1.2em;
}

.cons-card {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.08) 0%, var(--color-bg-card) 100%);
    border-color: rgba(255, 107, 107, 0.3);
}

.cons-card .card-title::before {
    content: '⚠ ';
    color: var(--color-accent-warning);
    font-size: 1.2em;
}

/* ============================================================
   11. ANIMATION CONTROLS (FOR ANIMATED PAGES)
   ============================================================ */

.animation-controls {
    /* Hide animation controls - handled by parent main.html */
    display: none !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

.anim-arrow,
.anim-button {
    width: 45px;
    height: 45px;
    background: rgba(60, 60, 60, 0.9);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--timing-quick) var(--ease-standard);
    user-select: none;
}

.anim-arrow:hover:not(:disabled),
.anim-button:hover:not(:disabled) {
    background: rgba(74, 158, 255, 0.15);
    border-color: var(--color-accent-primary);
    transform: scale(1.1);
    box-shadow: var(--glow-primary);
}

.anim-arrow:active,
.anim-button:active {
    transform: scale(0.95);
}

.anim-arrow:disabled,
.anim-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

.anim-step-indicator,
.animation-step-indicator {
    color: var(--color-text-tertiary);
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    min-width: 80px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

/* ============================================================
   12. RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 3.5rem;
        --font-size-3xl: 2.8rem;
        --font-size-2xl: 2.2rem;
        --font-size-xl: 2rem;
        --font-size-lg: 1.6rem;
        --space-8: 48px;
        --space-10: 64px;
    }

    .split-layout {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .card-grid-2,
    .card-grid-3 {
        grid-template-columns: 1fr;
    }

    .pros-cons-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2.8rem;
        --font-size-3xl: 2.2rem;
        --font-size-2xl: 1.8rem;
        --font-size-xl: 1.5rem;
        --font-size-lg: 1.4rem;
        --space-6: 24px;
        --space-7: 32px;
        --space-8: 40px;
        --space-10: 48px;
    }

    .slide-container {
        padding: var(--space-6);
    }

    .card {
        padding: var(--space-5);
    }

    .animation-controls {
        bottom: 70px;
        right: 15px;
        padding: var(--space-2) var(--space-4);
        gap: var(--space-3);
    }

    .anim-arrow,
    .anim-button {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}

/* ============================================================
   13. ACCESSIBILITY
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
*:focus-visible,
.focus-visible:focus {
    outline: 3px solid var(--color-accent-primary);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================================
   14. UTILITY CLASSES
   ============================================================ */

/* Spacing */
.mt-sm { margin-top: var(--space-4); }
.mt-md { margin-top: var(--space-5); }
.mt-lg { margin-top: var(--space-6); }
.mt-xl { margin-top: var(--space-8); }

.mb-sm { margin-bottom: var(--space-4); }
.mb-md { margin-bottom: var(--space-5); }
.mb-lg { margin-bottom: var(--space-6); }
.mb-xl { margin-bottom: var(--space-8); }

.p-sm { padding: var(--space-4); }
.p-md { padding: var(--space-5); }
.p-lg { padding: var(--space-6); }
.p-xl { padding: var(--space-8); }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Positioning */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

/* Z-Index */
.z-0 { z-index: var(--z-base); }
.z-10 { z-index: var(--z-elevated); }
.z-100 { z-index: var(--z-sticky); }
.z-1000 { z-index: var(--z-fixed); }

/* Opacity */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Visibility States */
.visible {
    opacity: 1;
    transform: translateY(0);
}