/* =====================================================
   SENSEI LMS SLIDESHOW MOCKUP V2 - MAIN STYLES
   Industrial Hygiene Fundamentals Course
   ===================================================== */

/* =====================================================
   CSS CUSTOM PROPERTIES & THEMING
   ===================================================== */
:root {
  /* Industrial Hygiene Color Progression for 15 Slides */
  --slide-1: #c41e3a;  /* Safety Red - Intro */
  --slide-2: #ff6b35;  /* Warning Orange - Chapter Overview */
  --slide-3: #2a9d8f;  /* Safety Green - Concept Intro */
  --slide-4: #2a9d8f;  /* Safety Green - Concept Deep Dive */
  --slide-5: #f4a261;  /* Caution Amber - Flashcard */
  --slide-6: #e76f51;  /* Alert Orange - Real-world Application */
  --slide-7: #d62828;  /* Danger Red - Image Hotspots */
  --slide-8: #264653;  /* Professional Navy - Video */
  --slide-9: #2a9d8f;  /* Training Green - Supporting Text */
  --slide-10: #e76f51; /* Assessment Orange - Quiz */
  --slide-11: #457b9d; /* Protocol Blue - Task List */
  --slide-12: #1d3557; /* Regulation Navy - Technical Details */
  --slide-13: #6c757d; /* Case Gray - Case Study */
  --slide-14: #495057; /* Summary Gray - Summary */
  --slide-15: #343a40; /* Complete Dark - Completion */

  /* Focus Scroll Reading Mode Colors */
  --reading-overlay: rgba(0, 0, 0, 0.95);
  --reading-focus-color: #10b981;
  --reading-text-focus: rgba(255, 255, 255, 1);
  --reading-text-near: rgba(255, 255, 255, 0.7);
  --reading-text-far: rgba(255, 255, 255, 0.4);

  /* Typography Scale */
  --font-size-hero: 3rem;        /* 48px */
  --font-size-h1: 2.5rem;        /* 40px */
  --font-size-h2: 2rem;          /* 32px */
  --font-size-h3: 1.5rem;        /* 24px */
  --font-size-h4: 1.25rem;       /* 20px */
  --font-size-body: 1.25rem;     /* 20px */
  --font-size-small: 1rem;       /* 16px */
  --font-size-ui: 0.875rem;      /* 14px */

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.5rem;   /* 8px */
  --spacing-sm: 1rem;     /* 16px */
  --spacing-md: 1.5rem;   /* 24px */
  --spacing-lg: 2rem;     /* 32px */
  --spacing-xl: 3rem;     /* 48px */
  --spacing-2xl: 4rem;    /* 64px */

  /* Layout */
  --container-max-width: 1200px;
  --content-width: 60%;
  --image-width: 40%;
  --video-split-width: 50%;

  /* Colors - UI */
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.9);
  --color-text-muted: rgba(255, 255, 255, 0.7);
  --color-overlay: rgba(0, 0, 0, 0.3);
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 600ms ease-in-out;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text-primary);
  overflow: hidden;
  background: #000;
}

/* =====================================================
   TYPOGRAPHY
   ===================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

h4 {
  font-size: var(--font-size-h4);
}

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

strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

/* =====================================================
   SLIDESHOW CONTAINER
   ===================================================== */
.slideshow-container {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

/* =====================================================
   INDIVIDUAL SLIDE
   ===================================================== */
.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 400ms ease-in-out, visibility 400ms;
  z-index: 1;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}

/* Slide Background with Dynamic Color */
.slide-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.slide[data-slide-number="1"] .slide-background { background: var(--slide-1); }
.slide[data-slide-number="2"] .slide-background { background: var(--slide-2); }
.slide[data-slide-number="3"] .slide-background { background: var(--slide-3); }
.slide[data-slide-number="4"] .slide-background { background: var(--slide-4); }
.slide[data-slide-number="5"] .slide-background { background: var(--slide-5); }
.slide[data-slide-number="6"] .slide-background { background: var(--slide-6); }
.slide[data-slide-number="7"] .slide-background { background: var(--slide-7); }
.slide[data-slide-number="8"] .slide-background { background: var(--slide-8); }
.slide[data-slide-number="9"] .slide-background { background: var(--slide-9); }
.slide[data-slide-number="10"] .slide-background { background: var(--slide-10); }
.slide[data-slide-number="11"] .slide-background { background: var(--slide-11); }
.slide[data-slide-number="12"] .slide-background { background: var(--slide-12); }
.slide[data-slide-number="13"] .slide-background { background: var(--slide-13); }
.slide[data-slide-number="14"] .slide-background { background: var(--slide-14); }
.slide[data-slide-number="15"] .slide-background { background: var(--slide-15); }

/* =====================================================
   SLIDE CONTENT
   ===================================================== */
.slide-content {
  max-width: var(--container-max-width);
  width: 100%;
  height: 100%;
  padding: 10vh var(--spacing-xl) 20vh var(--spacing-xl);
  margin: 0 auto;
  z-index: 3;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Hide Default Scrollbar */
.slide-content::-webkit-scrollbar {
  display: none;
}

.slide-content {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.slide-title {
  font-size: 3.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  text-align: left;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3),
               0 4px 16px rgba(0, 0, 0, 0.2);
  line-height: 1.2;
}

.slide-description {
  font-size: var(--font-size-h4);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.content-area {
  background: rgba(0, 0, 0, 0.2);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

/* =====================================================
   HERO CONTENT (SLIDE 1)
   ===================================================== */
.hero-content {
  text-align: center;
  padding: var(--spacing-2xl);
}

.hero-icon {
  margin-bottom: var(--spacing-lg);
  animation: pulse 2s ease-in-out infinite;
}

.hero-content .slide-title {
  font-size: 4.5rem;
  margin-bottom: var(--spacing-md);
  text-align: center;
  letter-spacing: -0.03em;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4),
               0 8px 24px rgba(0, 0, 0, 0.3);
}

.hero-content .slide-description {
  max-width: 800px;
  margin: 0 auto var(--spacing-xl) auto;
  text-align: center;
}

/* =====================================================
   COMPLETION CONTENT (SLIDE 15)
   ===================================================== */
.completion-content {
  text-align: center;
  padding: var(--spacing-2xl);
}

.completion-badge {
  margin-bottom: var(--spacing-lg);
  animation: scaleIn 600ms ease-out;
}

.completion-subtitle {
  font-size: var(--font-size-h3);
  color: var(--color-success);
  margin-bottom: var(--spacing-sm);
}

.completion-message {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-xl);
}

.achievement-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  color: var(--color-success);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.completion-content .progress-indicator {
  max-width: 700px;
  margin: 0 auto var(--spacing-xl) auto;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
}

.completion-content .progress-text {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-md);
  display: block;
  text-align: center;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.completion-content .progress-bar {
  height: 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto;
  max-width: 100%;
}

.next-section-preview {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.next-section-preview h3 {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-sm);
}

.next-section-preview p {
  font-size: var(--font-size-body);
  margin-bottom: 0;
}

/* =====================================================
   LAYOUT: SPLIT (TEXT + IMAGE/VIDEO)
   ===================================================== */
.split-layout {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
  height: 100%;
}

.content-left {
  flex: 1;
  padding-right: var(--spacing-lg);
}

.content-right {
  flex: 1;
}

/* =====================================================
   LAYOUT: VIDEO SPLIT (50/50)
   ===================================================== */
.video-layout {
  padding-bottom: 100px; /* Space for navigation */
}

.video-split-container {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.video-player-section {
  flex: 1;
}

.video-transcript-panel {
  flex: 1;
  background: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  max-height: 500px;
  display: flex;
  flex-direction: column;
}

/* =====================================================
   LISTS & OBJECTIVES
   ===================================================== */
.objectives-list {
  list-style: none;
  margin-left: 0;
}

.objective-item {
  padding-left: var(--spacing-lg);
  position: relative;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 400ms ease-out backwards;
}

.objective-item:nth-child(1) { animation-delay: 100ms; }
.objective-item:nth-child(2) { animation-delay: 200ms; }
.objective-item:nth-child(3) { animation-delay: 300ms; }
.objective-item:nth-child(4) { animation-delay: 400ms; }
.objective-item:nth-child(5) { animation-delay: 500ms; }
.objective-item:nth-child(6) { animation-delay: 600ms; }
.objective-item:nth-child(7) { animation-delay: 700ms; }

.objective-item::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
}

.summary-list {
  list-style: none;
  margin-left: 0;
}

.summary-list li {
  padding-left: var(--spacing-lg);
  position: relative;
  margin-bottom: var(--spacing-md);
}

.summary-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
}

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

.glossary-item {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.glossary-term {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  cursor: help;
  margin-bottom: var(--spacing-xs);
}

.glossary-definition {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin: 0;
}

/* =====================================================
   HAZARD CATEGORIES GRID
   ===================================================== */
.intro-text {
  font-size: var(--font-size-h4);
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

.hazard-categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.hazard-category {
  background: rgba(255, 255, 255, 0.08);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 2px solid rgba(255, 255, 255, 0.15);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.hazard-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.category-icon {
  font-size: 2rem;
  margin-right: var(--spacing-sm);
  display: inline-block;
  vertical-align: middle;
}

.hazard-category h3 {
  font-size: var(--font-size-h3);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
}

.hazard-category p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* =====================================================
   STATISTICS GRID
   ===================================================== */
.statistics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.stat-card {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 2px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
}

.stat-card:hover {
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.15);
}

.stat-card.highlight {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.5);
  grid-column: span 3;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.stat-card.highlight .stat-number {
  color: #fca5a5;
}

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

.conclusion-text {
  font-size: var(--font-size-h4);
  text-align: center;
  margin-top: var(--spacing-xl);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

/* =====================================================
   PPE GRID
   ===================================================== */
.ppe-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.ppe-item {
  background: rgba(255, 255, 255, 0.08);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 2px solid rgba(255, 255, 255, 0.15);
}

.ppe-item .ppe-icon {
  font-size: 1.5rem;
  margin-right: var(--spacing-sm);
  display: inline-block;
  vertical-align: middle;
}

.ppe-item h3 {
  display: flex;
  align-items: center;
}

.reminder-text {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md);
  background: rgba(245, 158, 11, 0.2);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-md);
  font-size: var(--font-size-small);
}

/* =====================================================
   CASE STUDY
   ===================================================== */
.case-study-section {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
}

.case-study-section h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.highlight-term {
  background: rgba(255, 193, 7, 0.3);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* =====================================================
   BUTTONS
   ===================================================== */
.cta-button {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-text-primary);
  border: 2px solid rgba(255, 255, 255, 0.5);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  display: inline-block;
}

.cta-button:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* =====================================================
   NAVIGATION BAR
   ===================================================== */
.navigation-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-button {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-ui);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-button:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

.nav-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.progress-indicator {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--spacing-lg);
  text-align: center;
}

.progress-indicator .progress-text {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.02em;
}

.progress-indicator #completion-percentage {
  font-size: 1.375rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-success);
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--spacing-xs);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), #34d399);
  transition: width 400ms ease-out;
  border-radius: var(--radius-full);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.5);
}

.progress-fill.animated-fill {
  animation: progressFill 1s ease-out forwards;
}

.completion-content .progress-fill {
  height: 12px;
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.6);
}

/* =====================================================
   MENU TRIGGER
   ===================================================== */
.hamburger-menu-trigger {
  position: fixed;
  top: var(--spacing-lg);
  left: var(--spacing-lg);
  padding: 12px 20px;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  z-index: 200;
  transition: all var(--transition-normal);
}

.hamburger-menu-trigger:hover {
  background: rgba(0, 0, 0, 0.7);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateX(2px);
}

.menu-icon {
  color: var(--color-text-primary);
  flex-shrink: 0;
}

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

/* =====================================================
   RESPONSIVE DESIGN
   ===================================================== */

/* Tablet (768px - 1023px) */
@media (max-width: 1023px) {
  .slide-content {
    padding: 10vh var(--spacing-lg) 20vh var(--spacing-lg);
  }

  .slide-title {
    font-size: 2.75rem;
  }

  .hero-content .slide-title {
    font-size: 3.5rem;
  }

  .split-layout {
    flex-direction: column;
  }

  .content-left,
  .content-right {
    padding-right: 0;
  }

  .video-split-container {
    flex-direction: column;
  }

  .hazard-categories-grid,
  .glossary-grid,
  .ppe-grid {
    grid-template-columns: 1fr;
  }

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

  .stat-card.highlight {
    grid-column: span 2;
  }

  .achievement-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

/* Mobile (320px - 767px) */
@media (max-width: 767px) {
  :root {
    --font-size-hero: 2rem;
    --font-size-h1: 1.75rem;
    --font-size-h2: 1.5rem;
    --font-size-h3: 1.25rem;
    --font-size-body: 1rem;
  }

  .slide-content {
    padding: 10vh var(--spacing-md) 20vh var(--spacing-md);
  }

  .slide-title {
    font-size: 2rem;
  }

  .hero-content .slide-title {
    font-size: 2.5rem;
  }

  .content-area {
    padding: var(--spacing-lg);
  }

  .navigation-bar {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .progress-indicator {
    max-width: 200px;
  }

  .hamburger-menu-trigger {
    width: 44px;
    height: 44px;
    top: var(--spacing-md);
    left: var(--spacing-md);
  }

  .statistics-grid {
    grid-template-columns: 1fr;
  }

  .stat-card.highlight {
    grid-column: span 1;
  }
}

/* =====================================================
   CUSTOM SCROLLBAR COMPONENT
   ===================================================== */
.custom-scrollbar {
  position: fixed;
  right: 120px;
  top: 15%;
  height: 70%;
  width: 64px;
  z-index: 100;
  pointer-events: none;
}

.custom-scrollbar-track {
  position: relative;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 6px;
}

.custom-scrollbar-thumb {
  position: absolute;
  left: 6px;
  right: 6px;
  width: calc(100% - 12px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.9));
  border-radius: 26px;
  cursor: pointer;
  pointer-events: all;
  transition: background 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.custom-scrollbar-thumb:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 1));
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.custom-scrollbar-thumb:active {
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

/* Hide scrollbar when not needed */
.custom-scrollbar.hidden {
  opacity: 0;
  pointer-events: none;
}

/* =====================================================
   UTILITY CLASSES
   ===================================================== */
.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* =====================================================
   ANIMATIONS
   ===================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

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

@keyframes progressFill {
  from {
    width: 0;
  }
}

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

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--color-info);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-info);
  outline-offset: 2px;
}