/**
 * TH0 PD Slides - Universal Slide Styles
 * Consolidated CSS for all presentation slides
 *
 * This file replaces inline styles in all slide HTML files.
 * Font sizes are optimized for presentation/projection.
 */

/* ========================================
   CSS VARIABLES (Theme)
   ======================================== */
:root {
    /* Primary colors */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;

    /* Accent colors */
    --secondary: #f59e0b;
    --accent: #10b981;
    --danger: #ef4444;
    --purple: #8b5cf6;
    --pink: #ec4899;

    /* Background colors */
    --bg: #0f172a;
    --bg-light: #1e293b;
    --bg-card: #334155;

    /* Text colors */
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #475569;

    /* Font sizes - Presentation optimized (LARGER) */
    --font-size-h1: 56px;
    --font-size-h2: 42px;
    --font-size-h3: 32px;
    --font-size-h4: 24px;
    --font-size-body: 20px;
    --font-size-secondary: 18px;
    --font-size-caption: 16px;
    --font-size-small: 14px;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
}

/* ========================================
   RESET & BASE
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    font-size: var(--font-size-body);
    line-height: 1.5;
}

/* ========================================
   SLIDE CONTAINER & VIEWPORT
   ======================================== */
.slide-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.slide-viewport {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 60px;
}

/* ========================================
   SLIDE BASE
   ======================================== */
.slide {
    display: none;
    width: 100%;
    max-width: 1400px;
    height: 100%;
    flex-direction: column;
    justify-content: center;
}

.slide.active {
    display: flex;
}

/* ========================================
   TITLE SLIDE
   ======================================== */
.slide-title {
    align-items: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-2xl);
    padding: 60px;
}

.slide-title .icon {
    font-size: 100px;
    margin-bottom: var(--spacing-lg);
}

.slide-title h1 {
    font-size: var(--font-size-h1);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.slide-title .subtitle {
    font-size: 28px;
    opacity: 0.9;
}

.slide-title .tag {
    margin-top: var(--spacing-lg);
    font-size: var(--font-size-secondary);
    opacity: 0.7;
}

/* ========================================
   CONTENT SLIDE
   ======================================== */
.slide-content {
    background: var(--bg-light);
    border-radius: var(--radius-2xl);
    padding: 50px 60px;
}

.slide-content h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slide-content h2 .icon {
    font-size: 48px;
}

/* ========================================
   PROGRESSIVE REVEAL
   ======================================== */
.reveal-item {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.reveal-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   GRID LAYOUTS
   ======================================== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

/* Responsive grids */
@media (max-width: 1200px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-2 { grid-template-columns: 1fr; }
}

/* ========================================
   CARDS - Base
   ======================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border-top: 4px solid var(--primary);
}

.card:nth-child(2) { border-top-color: var(--secondary); }
.card:nth-child(3) { border-top-color: var(--accent); }
.card:nth-child(4) { border-top-color: var(--purple); }
.card:nth-child(5) { border-top-color: var(--pink); }

.card .icon {
    font-size: 44px;
    margin-bottom: var(--spacing-md);
}

.card h4 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
}

.card p {
    font-size: var(--font-size-body);
    color: var(--text-muted);
    line-height: 1.6;
}

/* ========================================
   LESSON CARD
   ======================================== */
.lesson-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--primary);
}

.lesson-card .lesson-num {
    font-size: var(--font-size-small);
    color: var(--primary-light);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.lesson-card h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-xs);
}

.lesson-card p {
    font-size: var(--font-size-caption);
    color: var(--text-muted);
}

.lesson-card .yccd {
    font-family: monospace;
    font-size: var(--font-size-small);
    color: var(--purple);
    margin-top: var(--spacing-sm);
}

/* ========================================
   ACTIVITY CARD
   ======================================== */
.activity-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
}

.activity-card .icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.activity-card h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-xs);
    color: var(--primary-light);
}

.activity-card p {
    font-size: var(--font-size-caption);
    color: var(--text-muted);
}

/* ========================================
   MODEL STEP (for 5E or sequential models)
   ======================================== */
.model-step {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    min-width: 140px;
}

.model-step .number {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.model-step h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-xs);
}

.model-step p {
    font-size: var(--font-size-caption);
    color: var(--text-muted);
    line-height: 1.4;
}

/* ========================================
   ANCHOR BOX (Key Concept Highlight)
   ======================================== */
.anchor-box {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.anchor-box .label {
    font-size: var(--font-size-secondary);
    text-transform: uppercase;
    letter-spacing: 3px;
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.anchor-box h3 {
    font-size: var(--font-size-h3);
}

/* ========================================
   SIMPLE LIST
   ======================================== */
.simple-list {
    font-size: 26px;
    line-height: 2;
    list-style: none;
}

.simple-list li {
    margin-bottom: var(--spacing-sm);
}

.simple-list strong {
    color: var(--primary-light);
}

/* ========================================
   DEMO BOX
   ======================================== */
.demo-box {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 40px;
    text-align: center;
    border: 2px solid var(--primary);
}

.demo-box .icon {
    font-size: 80px;
    margin-bottom: var(--spacing-md);
}

.demo-box h4 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
}

.demo-box p {
    font-size: var(--font-size-body);
    color: var(--text-muted);
}

/* ========================================
   ACTIVITY BOX (with timer)
   ======================================== */
.activity-box {
    background: var(--bg-card);
    border: 2px dashed var(--primary);
    border-radius: var(--radius-xl);
    padding: 50px;
    text-align: center;
}

.activity-box .icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.activity-box h4 {
    font-size: 28px;
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
}

.activity-box p {
    font-size: var(--font-size-body);
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

/* Timer display */
.timer-display {
    font-size: 72px;
    font-weight: 800;
    color: var(--primary-light);
    font-family: monospace;
    margin-bottom: var(--spacing-lg);
}

.timer-display.warning {
    color: var(--danger);
}

/* ========================================
   TIP CARD
   ======================================== */
.tip-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--secondary);
}

.tip-card .label {
    color: var(--secondary);
    font-size: var(--font-size-caption);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.tip-card p {
    font-size: var(--font-size-secondary);
    line-height: 1.6;
}

/* ========================================
   PITFALL CARD
   ======================================== */
.pitfall-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 0;
    overflow: hidden;
}

.pitfall-card .wrong {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: white;
    font-size: 28px;
    font-weight: 700;
    padding: var(--spacing-lg) 36px;
}

.pitfall-card .right {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    font-size: 28px;
    font-weight: 700;
    padding: var(--spacing-lg) 36px;
    line-height: 1.6;
}

/* ========================================
   DIFF CARD (Version comparison)
   ======================================== */
.diff-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.diff-card .badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: var(--font-size-small);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.diff-card.goc .badge { background: var(--accent); }
.diff-card.nc .badge { background: var(--purple); }

.diff-card h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-sm);
}

.diff-card ul {
    padding-left: 20px;
    font-size: var(--font-size-caption);
    line-height: 1.8;
    color: var(--text-muted);
}

/* ========================================
   MISCONCEPTION CARD
   ======================================== */
.misconception-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 0;
    overflow: hidden;
}

.misconception-card .wrong {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    color: white;
    font-size: 28px;
    font-weight: 700;
    padding: var(--spacing-lg) 36px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.misconception-card .right {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    font-size: 28px;
    font-weight: 700;
    padding: var(--spacing-lg) 36px;
    line-height: 1.6;
}

/* ========================================
   AGE CARD (Version differentiation)
   ======================================== */
.age-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.age-card.basic { border-top: 4px solid var(--accent); }
.age-card.advanced { border-top: 4px solid var(--purple); }

.age-card .badge {
    display: inline-block;
    padding: 8px 18px;
    border-radius: 20px;
    font-size: var(--font-size-caption);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.age-card.basic .badge { background: var(--accent); }
.age-card.advanced .badge { background: var(--purple); }

.age-card h4 {
    font-size: 26px;
    margin-bottom: var(--spacing-md);
}

.age-card ul {
    padding-left: var(--spacing-lg);
    font-size: var(--font-size-body);
    line-height: 1.8;
}

/* ========================================
   FAQ CARD
   ======================================== */
.faq-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 40px 48px;
}

.faq-card .question {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text);
}

.faq-card .answer {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(5, 150, 105, 0.15));
    border-left: 4px solid var(--accent);
    padding: 28px 32px;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    font-size: 26px;
    font-style: italic;
    color: #d1fae5;
    line-height: 1.6;
}

/* ========================================
   STAT CARD
   ======================================== */
.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    border-top: 3px solid var(--primary);
}

.stat-card:nth-child(2) { border-top-color: var(--secondary); }
.stat-card:nth-child(3) { border-top-color: var(--accent); }
.stat-card:nth-child(4) { border-top-color: var(--danger); }

.stat-card .number {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.stat-card .label {
    font-size: var(--font-size-secondary);
    color: var(--text);
    line-height: 1.5;
}

/* ========================================
   SCRIPT BOX (Teacher script)
   ======================================== */
.script-box {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-style: italic;
    font-size: var(--font-size-body);
    line-height: 1.7;
}

.script-box .label {
    font-style: normal;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-caption);
}

/* ========================================
   HIGHLIGHT BOX
   ======================================== */
.highlight-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(79, 70, 229, 0.2));
    border: 2px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    font-size: var(--font-size-h4);
}

/* ========================================
   KEY POINT
   ======================================== */
.key-point {
    font-size: 26px;
    text-align: center;
    color: var(--text-muted);
    margin-top: 30px;
    line-height: 1.7;
}

.key-point strong {
    color: var(--primary-light);
}

/* ========================================
   COMPARISON TABLE
   ======================================== */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-body);
}

.comparison-table th {
    background: var(--primary);
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-size: 22px;
}

.comparison-table td {
    background: var(--bg-card);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.comparison-table tr:nth-child(even) td {
    background: rgba(51, 65, 85, 0.7);
}

/* ========================================
   MAPPING TABLE (YCCD references)
   ======================================== */
.mapping-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-caption);
}

.mapping-table th {
    background: var(--bg-card);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}

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

.mapping-table .code-cell {
    font-family: monospace;
    color: var(--primary-light);
    font-size: var(--font-size-small);
}

/* ========================================
   FRAMEWORK CARD (Standards display)
   ======================================== */
.framework-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: left;
}

.framework-card .code-badge {
    font-family: monospace;
    font-size: var(--font-size-caption);
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: var(--spacing-xs);
}

.framework-card h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-xs);
}

.framework-card p {
    font-size: var(--font-size-caption);
    color: var(--text-muted);
}

/* ========================================
   YCCD CARD (Assessment standards)
   ======================================== */
.yccd-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    border-left: 4px solid var(--primary);
}

.yccd-card .code {
    font-family: monospace;
    font-size: var(--font-size-caption);
    color: var(--primary-light);
    background: rgba(139, 92, 246, 0.2);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    display: inline-block;
    margin-bottom: var(--spacing-sm);
}

.yccd-card h4 {
    font-size: var(--font-size-body);
    margin-bottom: var(--spacing-xs);
}

.yccd-card p {
    font-size: var(--font-size-secondary);
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========================================
   STANDARD CARD (Regulatory standards)
   ======================================== */
.standard-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.standard-card .badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: var(--font-size-caption);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.standard-card.yccd .badge { background: var(--primary); }
.standard-card.qd .badge { background: #0ea5e9; }
.standard-card.cv .badge { background: var(--accent); }

.standard-card h4 {
    font-size: 22px;
    margin-bottom: var(--spacing-sm);
}

.standard-card p {
    font-size: var(--font-size-secondary);
    color: var(--text-muted);
    line-height: 1.6;
}

/* ========================================
   MAPPING CARD (Standards mapping)
   ======================================== */
.mapping-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.mapping-card .yccd-tag {
    font-family: monospace;
    font-size: var(--font-size-small);
    color: var(--primary-light);
    background: rgba(139, 92, 246, 0.2);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    display: inline-block;
}

.mapping-card h4 {
    font-size: var(--font-size-secondary);
    margin: var(--spacing-sm) 0 var(--spacing-xs);
}

.mapping-card .standards {
    font-size: var(--font-size-caption);
    color: var(--text-muted);
}

.mapping-card .qd-tag { color: #0ea5e9; }
.mapping-card .cv-tag { color: var(--accent); }

/* ========================================
   FLOW CONTAINER (Process visualization)
   ======================================== */
.flow-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin: 30px 0;
}

.flow-box {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 30px 40px;
    text-align: center;
    border-top: 4px solid var(--primary);
}

.flow-box:nth-child(3) { border-top-color: var(--secondary); }
.flow-box:nth-child(5) { border-top-color: var(--accent); }

.flow-box .icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
}

.flow-box h4 {
    font-size: 22px;
    margin-bottom: var(--spacing-xs);
}

.flow-box p {
    font-size: var(--font-size-secondary);
    color: var(--text-muted);
}

.flow-arrow {
    font-size: 36px;
    color: var(--primary-light);
}

/* ========================================
   CHECKLIST CARD
   ======================================== */
.checklist-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border-top: 4px solid var(--accent);
}

.checklist-card h4 {
    font-size: var(--font-size-secondary);
    margin-bottom: var(--spacing-md);
}

.checklist-card ul {
    list-style: none;
    font-size: var(--font-size-caption);
}

.checklist-card li {
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ========================================
   ERROR CARD (AI mistakes demo)
   ======================================== */
.error-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--danger);
}

.error-card .label {
    font-size: var(--font-size-small);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.error-card .ai-response {
    font-size: var(--font-size-secondary);
    color: var(--danger);
    margin-bottom: var(--spacing-sm);
}

.error-card .truth {
    font-size: var(--font-size-caption);
    color: var(--accent);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    padding: var(--spacing-md) 40px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-body);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
}

.btn-secondary:hover {
    background: var(--primary);
}

/* ========================================
   NAVIGATION BAR
   ======================================== */
.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 60px;
    background: var(--bg-light);
}

.nav-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.slide-counter {
    font-size: var(--font-size-secondary);
    color: var(--text-muted);
}

.progress-bar {
    width: 240px;
    height: 6px;
    background: var(--bg-card);
    border-radius: 3px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
    transition: width 0.3s;
}

.nav-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    padding: var(--spacing-sm) 28px;
    background: var(--bg-card);
    color: var(--text);
    border: none;
    border-radius: 10px;
    font-size: var(--font-size-caption);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.nav-btn:hover {
    background: var(--primary);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-btn.primary {
    background: var(--primary);
}

/* ========================================
   TOP TAGS (Module info, timer)
   ======================================== */
.top-tags {
    position: fixed;
    top: 70px;
    left: 30px;
    right: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.top-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.top-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.back-btn {
    background: var(--bg-card);
    padding: var(--spacing-sm) 18px;
    border-radius: 10px;
    font-size: var(--font-size-caption);
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s;
}

.back-btn:hover {
    background: var(--primary);
}

.module-tag,
.session-timer {
    background: var(--bg-card);
    padding: var(--spacing-sm) 22px;
    border-radius: 10px;
    font-size: var(--font-size-caption);
    font-weight: 600;
}

.session-timer {
    font-family: monospace;
}

/* ========================================
   CLICK HINT
   ======================================== */
.click-hint {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    padding: 10px 24px;
    border-radius: 20px;
    font-size: var(--font-size-small);
    color: var(--text-muted);
    opacity: 0.7;
}

/* ========================================
   FACILITATOR PANEL
   ======================================== */
.facilitator-panel {
    position: fixed;
    bottom: 90px;
    right: 30px;
    width: 400px;
    max-height: 450px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    display: none;
    z-index: 100;
}

.facilitator-panel.show {
    display: block;
}

.facilitator-header {
    padding: 18px 24px;
    background: var(--primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: var(--font-size-secondary);
}

.facilitator-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

.facilitator-content {
    padding: var(--spacing-lg);
    max-height: 360px;
    overflow-y: auto;
    font-size: var(--font-size-caption);
    line-height: 1.7;
}

.facilitator-content h4 {
    color: var(--secondary);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-secondary);
}

/* ========================================
   BOOK LINKS (Mini)
   ======================================== */
.book-links-mini {
    display: flex;
    gap: var(--spacing-xs);
}

.book-links-mini a {
    padding: 10px 14px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--font-size-small);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
}

.book-links-mini a:hover {
    background: var(--primary);
    color: white;
}

/* ========================================
   LANGUAGE SWITCH
   ======================================== */
.lang-switch {
    display: flex;
    background: var(--bg-card);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.lang-switch button {
    padding: 8px 14px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-switch button:hover {
    color: var(--text);
}

.lang-switch button.active {
    background: var(--primary);
    color: white;
}

/* ========================================
   PROMPT CARD (Prompting examples)
   ======================================== */
.prompt-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    font-family: monospace;
}

.prompt-card .label {
    font-size: var(--font-size-small);
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
    font-family: 'Segoe UI', system-ui, sans-serif;
}

.prompt-card .prompt {
    background: rgba(99, 102, 241, 0.1);
    border-left: 3px solid var(--primary);
    padding: var(--spacing-md);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: var(--font-size-secondary);
    line-height: 1.6;
}

.prompt-card .result {
    margin-top: var(--spacing-md);
    color: var(--text-muted);
    font-size: var(--font-size-caption);
    font-family: 'Segoe UI', system-ui, sans-serif;
}

/* ========================================
   COMPARE CARD (Good vs Bad examples)
   ======================================== */
.compare-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.compare-card.bad { border-left: 4px solid var(--danger); }
.compare-card.good { border-left: 4px solid var(--accent); }

.compare-card .tag {
    font-size: var(--font-size-small);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.compare-card.bad .tag { color: var(--danger); }
.compare-card.good .tag { color: var(--accent); }

.compare-card .text {
    font-family: monospace;
    font-size: var(--font-size-caption);
    line-height: 1.5;
}

/* ========================================
   FORMULA BOX
   ======================================== */
.formula-box {
    background: linear-gradient(135deg, var(--secondary) 0%, #1d4ed8 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
}

.formula-box .formula {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.formula-box p {
    font-size: var(--font-size-secondary);
    opacity: 0.9;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary-light); }
.text-secondary { color: var(--secondary); }
.text-accent { color: var(--accent); }
.text-danger { color: var(--danger); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ========================================
   RESPONSIVE ADJUSTMENTS
   ======================================== */
@media (max-width: 1200px) {
    :root {
        --font-size-h1: 48px;
        --font-size-h2: 36px;
        --font-size-h3: 28px;
        --font-size-h4: 22px;
        --font-size-body: 18px;
    }

    .slide-viewport {
        padding: 30px 40px;
    }

    .slide-content {
        padding: 40px 50px;
    }
}

@media (max-width: 900px) {
    :root {
        --font-size-h1: 40px;
        --font-size-h2: 32px;
        --font-size-h3: 24px;
        --font-size-h4: 20px;
        --font-size-body: 16px;
    }

    .nav-bar {
        padding: var(--spacing-sm) 30px;
    }

    .top-tags {
        left: 15px;
        right: 15px;
    }
}