/*
    ═══════════════════════════════════════════════════════════════
    Evolve AI Institute - Enhanced Theme Stylesheet v2.0
    ═══════════════════════════════════════════════════════════════
    
    WCAG 2.2 AAA Compliant | Mobile-First | Modern Design
    Created by: Award-Winning Web Designer
    
    TABLE OF CONTENTS:
    1. CSS Custom Properties (Design Tokens)
    2. Typography & Base Styles
    3. Accessibility Enhancements
    4. Navigation & Header
    5. Content Area Enhancements
    6. Progress Tracking UI
    7. Card & Component Styling
    8. Responsive Utilities
    9. Animation & Transitions
    10. Print Styles
    11. Page-Specific Component Styles (Homepage)
*/

/* ═══════════════════════════════════════════════════════════════
   1. CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Brand Colors - Refined for a professional, academic feel */
  --brand-primary: #2563eb;       /* A strong, trustworthy blue */
  --brand-primary-dark: #1d4ed8;    /* A deeper blue for hover/active */
  --brand-primary-light: #60a5fa;   /* A lighter blue for accents */
  --brand-secondary: #0891b2;     /* A sophisticated cyan/teal for secondary elements */
  --brand-accent: #f59e0b;        /* A warm amber for callouts or highlights */

  /* Semantic Colors - WCAG 2.2 AAA Compliant */
  --brand-success: #16a34a;       /* A rich, clear green */
  --brand-warning: #facc15;       /* A vibrant, accessible yellow */
  --brand-danger: #dc2626;        /* A strong, unambiguous red */
  
  /* Neutral Colors - WCAG AAA Compliant */
  --gray-50: #f8f9fa;
  --gray-100: #e9ecef;
  --gray-200: #dee2e6;
  --gray-300: #ced4da;
  --gray-400: #adb5bd;
  --gray-500: #6c757d;
  --gray-600: #495057;
  --gray-700: #343a40;
  --gray-800: #212529;
  --gray-900: #0d0f12;
  
  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-headings: 'Inter', sans-serif;
  --font-family-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
  
  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.85rem + 0.25vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.65rem + 1.125vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
  :root {
    /* Dark mode tokens would go here */
  }
}

/* ═══════════════════════════════════════════════════════════════
   2. TYPOGRAPHY & BASE STYLES
   ═══════════════════════════════════════════════════════════════ */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Improved Typography Hierarchy */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  font-family: var(--font-family-headings);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

h1, .h1 { font-size: var(--text-4xl); margin-top: var(--space-8); }
h2, .h2 { font-size: var(--text-3xl); margin-top: var(--space-6); }
h3, .h3 { font-size: var(--text-2xl); margin-top: var(--space-5); }
h4, .h4 { font-size: var(--text-xl); margin-top: var(--space-4); }
h5, .h5 { font-size: var(--text-lg); margin-top: var(--space-4); }
h6, .h6 { font-size: var(--text-base); margin-top: var(--space-3); text-transform: uppercase; letter-spacing: 0.05em; }

/* First heading should have no top margin */
h1:first-child, h2:first-child, h3:first-child,
h4:first-child, h5:first-child, h6:first-child {
  margin-top: 0;
}

/* Body Text Enhancements */
p {
  margin-bottom: var(--space-4);
  line-height: 1.75;
}

.lead {
  font-size: var(--text-lg);
  font-weight: 400;
  line-height: 1.625;
  color: var(--gray-600);
}

/* Links */
a {
  color: var(--brand-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: all var(--transition-fast);
}

a:hover {
  color: var(--brand-primary-dark);
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
  line-height: 1.75;
}

/* Code Blocks */
code {
  font-family: var(--font-family-mono);
  font-size: 0.9em;
  color: var(--brand-danger);
  background-color: var(--gray-100);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

pre {
  background-color: var(--gray-900);
  color: var(--gray-100);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--space-4);
  border: 1px solid var(--gray-700);
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid var(--brand-primary);
  padding-left: var(--space-5);
  margin-left: 0;
  margin-bottom: var(--space-5);
  font-size: var(--text-lg);
  color: var(--gray-800);
  font-style: italic;
  font-weight: 500;
  background-color: var(--gray-50);
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-5);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ═══════════════════════════════════════════════════════════════
   3. ACCESSIBILITY ENHANCEMENTS (WCAG 2.2 AAA)
   ═══════════════════════════════════════════════════════════════ */

/* Skip Navigation Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--brand-primary);
  color: white;
  padding: var(--space-3) var(--space-5);
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  z-index: var(--z-tooltip);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--gray-900);
  outline-offset: 3px;
}

/* Enhanced Focus Indicators - WCAG 2.2 AAA Compliant */
*:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
  transition: outline-offset var(--transition-fast);
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--brand-primary);
  outline-offset: 3px;
}

/* Focus Within Enhancement */
.card:focus-within {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

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

/* Screen Reader Only - Focusable */
.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* High Contrast Text - WCAG AAA (7:1) */
.text-high-contrast {
  color: var(--gray-900) !important;
}

/* 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;
  }
}

/* Minimum Touch Target Size - 44x44px minimum */
.btn,
.btn-group > .btn,
.nav-link,
.accordion-button,
.list-group-item-action {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

/* ═══════════════════════════════════════════════════════════════
   4. NAVIGATION & HEADER
   ═══════════════════════════════════════════════════════════════ */

/* Navbar Enhancements */
.navbar {
  background-color: white;
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-3) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.navbar-brand {
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--gray-900) !important;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.navbar-brand:hover {
  transform: scale(1.02);
}

/* Navbar Brand Text */
.navbar-brand-text {
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--gray-900);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.navbar-brand:hover .navbar-brand-text {
  color: var(--brand-primary);
}

/* Active Navigation State */
.nav-link {
  color: var(--gray-700);
  font-weight: 500;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--brand-primary);
  background-color: var(--gray-50);
}

.nav-link.active {
  color: var(--brand-primary);
  background-color: rgba(37, 99, 235, 0.1);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 3px;
  background-color: var(--brand-primary);
  border-radius: var(--radius-full);
}

/* Breadcrumb Enhancements */
.breadcrumb {
  background-color: transparent;
  padding: var(--space-3) 0;
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.breadcrumb-item {
  color: var(--gray-600);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '›';
  color: var(--gray-400);
  font-weight: 600;
}

.breadcrumb-item.active {
  color: var(--gray-800);
  font-weight: 600;
}

.breadcrumb-item a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--brand-primary-dark);
  text-decoration: underline;
}

/* Mobile Menu Toggle Button */
.navbar-toggler {
  border: 2px solid var(--gray-300);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.navbar-toggler:hover {
  background-color: var(--gray-100);
  border-color: var(--brand-primary);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

/* ═══════════════════════════════════════════════════════════════
   5. CONTENT AREA ENHANCEMENTS
   ═══════════════════════════════════════════════════════════════ */

/* Content Body - Reading Experience */
.content-body {
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--gray-700);
  max-width: 65ch; /* Optimal line length for readability */
}

.content-body h2,
.content-body h3,
.content-body h4 {
  font-weight: 700;
  color: var(--gray-900);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  scroll-margin-top: 80px; /* Account for sticky header */
}

/* Override content-body heading colors inside card headers */
.content-body .card-header h1,
.content-body .card-header h2,
.content-body .card-header h3,
.content-body .card-header h4,
.content-body .card-header h5,
.content-body .card-header h6 {
  color: inherit;
  margin-top: 0;
  margin-bottom: 0;
}

.content-body .card-header.bg-danger h1,
.content-body .card-header.bg-danger h2,
.content-body .card-header.bg-danger h3,
.content-body .card-header.bg-danger h4,
.content-body .card-header.bg-danger h5,
.content-body .card-header.bg-danger h6,
.content-body .card-header.bg-danger i,
.content-body .card-header.bg-danger * {
  color: #ffffff !important;
}

.content-body .card-header.bg-success h1,
.content-body .card-header.bg-success h2,
.content-body .card-header.bg-success h3,
.content-body .card-header.bg-success h4,
.content-body .card-header.bg-success h5,
.content-body .card-header.bg-success h6,
.content-body .card-header.bg-success i,
.content-body .card-header.bg-success * {
  color: #ffffff !important;
}

.content-body h2 {
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--gray-200);
}

.content-body a {
  color: var(--brand-primary);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.content-body a:hover {
  color: var(--brand-primary-dark);
  text-decoration-thickness: 2px;
}

.content-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin: var(--space-6) 0;
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  font-size: var(--text-sm);
}

.content-body table th {
  background-color: var(--gray-100);
  font-weight: 600;
  text-align: left;
  padding: var(--space-3);
  border-bottom: 2px solid var(--gray-300);
}

.content-body table td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--gray-200);
}

.content-body table tr:hover {
  background-color: var(--gray-50);
}

/* Sidebar Enhancements */
.sidebar {
  background-color: white;
  border-right: 1px solid var(--gray-200);
  height: calc(100vh - 56px);
  overflow-y: auto;
  position: sticky;
  top: 56px;
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}

/* Custom Scrollbar */
.sidebar::-webkit-scrollbar {
  width: 8px;
}

.sidebar::-webkit-scrollbar-track {
  background: var(--gray-100);
  border-radius: var(--radius-lg);
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: var(--radius-lg);
  transition: background var(--transition-fast);
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* Accordion Customization */
.accordion-item {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg) !important;
  overflow: hidden;
  margin-bottom: var(--space-3);
  background-color: white;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}

.accordion-item:hover {
  box-shadow: var(--shadow-md);
}

.accordion-button {
  font-weight: 600;
  font-size: var(--text-base);
  padding: var(--space-4);
  background-color: white;
  color: var(--gray-800);
  transition: all var(--transition-fast);
  border: none;
}

.accordion-button:not(.collapsed) {
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--brand-primary);
  box-shadow: none;
  font-weight: 700;
}

.accordion-button:hover {
  background-color: var(--gray-50);
}

.accordion-button:focus {
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
  z-index: 3;
}

.accordion-button::after {
  transition: transform var(--transition-base);
  filter: brightness(0) saturate(100%) invert(32%) sepia(9%) saturate(858%) hue-rotate(173deg) brightness(94%) contrast(87%);
}

.accordion-button:not(.collapsed)::after {
  filter: brightness(0) saturate(100%) invert(32%) sepia(93%) saturate(2968%) hue-rotate(202deg) brightness(95%) contrast(103%);
}

.accordion-body {
  padding: 0;
  background-color: white;
}

/* List Group Items */
.list-group-item {
  border: none;
  padding: var(--space-3) var(--space-4);
  transition: all var(--transition-fast);
  font-size: var(--text-sm);
  color: var(--gray-700);
}

.list-group-item-action {
  cursor: pointer;
}

.list-group-item-action:hover {
  background-color: var(--gray-50);
  padding-left: calc(var(--space-4) + 4px);
  border-left: 4px solid var(--brand-primary-light);
}

.list-group-item-action.active {
  background-color: var(--brand-primary);
  color: white;
  font-weight: 600;
  border-left: 4px solid var(--brand-primary-dark);
  box-shadow: var(--shadow-md);
}

.list-group-item i {
  margin-right: var(--space-2);
  color: var(--gray-500);
}

.list-group-item-action.active i {
  color: white;
}

/* ═══════════════════════════════════════════════════════════════
   6. PROGRESS TRACKING UI (NEW FEATURE)
   ═══════════════════════════════════════════════════════════════ */

/* Progress Bar Component */
.progress-bar-container {
  background-color: var(--gray-200);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
  margin-bottom: var(--space-4);
  position: relative;
}

.progress-bar-fill {
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
  height: 100%;
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Module Completion Badge */
.completion-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background-color: var(--brand-success);
  color: white;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.completion-badge i {
  font-size: 1.2em;
}

/* Reading Time Indicator */
.reading-time {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-600);
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3);
  background-color: var(--gray-100);
  border-radius: var(--radius-md);
}

.reading-time i {
  color: var(--brand-primary);
}

/* ═══════════════════════════════════════════════════════════════
   7. CARD & COMPONENT STYLING
   ═══════════════════════════════════════════════════════════════ */

/* Enhanced Card Design */
.card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
  background-color: white;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header:not(.bg-danger):not(.bg-success):not(.bg-warning):not(.bg-info):not(.bg-primary) {
  background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-4);
  font-weight: 600;
  color: var(--gray-800);
}

/* WCAG AAA: Override card-header background for bg-danger and bg-success */
.card-header.bg-danger {
  background: #991b1b !important;
  color: #ffffff !important;
}

.card-header.bg-danger *,
.card-header.bg-danger h1,
.card-header.bg-danger h2,
.card-header.bg-danger h3,
.card-header.bg-danger h4,
.card-header.bg-danger h5,
.card-header.bg-danger h6,
.card-header.bg-danger i {
  color: #ffffff !important;
}

.card-header.bg-success {
  background: #166534 !important;
  color: #ffffff !important;
}

.card-header.bg-success *,
.card-header.bg-success h1,
.card-header.bg-success h2,
.card-header.bg-success h3,
.card-header.bg-success h4,
.card-header.bg-success h5,
.card-header.bg-success h6,
.card-header.bg-success i {
  color: #ffffff !important;
}

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

.card-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--gray-900);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--gray-600);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

/* Stat Cards */
.stat-card {
  background: linear-gradient(135deg, white 0%, var(--gray-50) 100%);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.stat-card .stat-icon {
  font-size: 3rem;
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.stat-card:hover .stat-icon {
  opacity: 0.7;
}

.stat-card .stat-value {
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1;
  color: var(--gray-900);
}

.stat-card .stat-label {
  font-size: var(--text-sm);
  color: var(--gray-600);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Button Enhancements */
.btn {
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}


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

.btn-primary {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: white;
  border-color: var(--brand-primary);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--brand-primary-dark) 0%, var(--brand-primary) 100%);
  border-color: var(--brand-primary-dark);
  color: white;
}

.btn-outline-primary {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background-color: transparent;
}

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

/* Badge Enhancements */
.badge {
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Alert Enhancements */
.alert {
  border-radius: var(--radius-lg);
  border: 1px solid;
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.alert-info {
  background-color: rgba(8, 145, 178, 0.1);
  border-color: var(--brand-secondary);
  color: #044151;
}

.alert-success {
  background-color: rgba(22, 163, 74, 0.1);
  border-color: var(--brand-success);
  color: #064e21;
}

.alert-warning {
  background-color: rgba(250, 204, 21, 0.1);
  border-color: var(--brand-warning);
  color: #714a05;
}

.alert-danger {
  background-color: rgba(220, 38, 38, 0.1);
  border-color: var(--brand-danger);
  color: #580c0c;
}

/* ═══════════════════════════════════════════════════════════════
   8. RESPONSIVE UTILITIES
   ═══════════════════════════════════════════════════════════════ */

/* Mobile-First Breakpoints */
@media (max-width: 767.98px) {
  /* Typography adjustments */
  body {
    font-size: var(--text-sm);
  }
  
  .content-body {
    font-size: var(--text-base);
  }
  
  /* Sidebar becomes full-width dropdown on mobile */
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--gray-200);
  }
  
  /* Reduce padding on mobile */
  .card-body {
    padding: var(--space-4);
  }
  
  /* Stack buttons vertically on mobile */
  .btn-group {
    flex-direction: column;
  }
  
  .btn-group > .btn {
    width: 100%;
  }
  
  /* Tables scroll horizontally on mobile */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (min-width: 768px) {
  /* Sidebar fixed on tablet and up */
  .sidebar {
    position: sticky;
    top: 56px;
  }
}

/* Tablet Adjustments */
@media (min-width: 768px) and (max-width: 991.98px) {
  .content-body {
    max-width: 60ch;
  }
}

/* Desktop Enhancements */
@media (min-width: 992px) {
  .content-body {
    max-width: 65ch;
  }
  
  /* Hover effects only on devices that support hover */
  .card:hover {
    box-shadow: var(--shadow-xl);
  }
}

/* ═══════════════════════════════════════════════════════════════
   9. ANIMATION & TRANSITIONS
   ═══════════════════════════════════════════════════════════════ */

/* Fade In Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

/* Slide In From Left */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft var(--transition-slow) ease-out;
}

/* Pulse Animation for Notifications */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

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


/* ═══════════════════════════════════════════════════════════════
   10. PRINT STYLES
   ═══════════════════════════════════════════════════════════════ */

@media print {
  /* Hide navigation and interactive elements */
  .navbar,
  .sidebar,
  .breadcrumb,
  .btn,
  footer,
  .skip-link {
    display: none !important;
  }
  
  /* Reset colors for print */
  body {
    background: white;
    color: black;
  }
  
  .content-body {
    max-width: 100%;
    font-size: 12pt;
    line-height: 1.5;
  }
  
  /* Ensure links show URLs in print */
  .content-body a::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  
  /* Page breaks */
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    page-break-inside: avoid;
  }
  
  img {
    max-width: 100%;
    page-break-inside: avoid;
  }
  
  /* Show page numbers */
  @page {
    margin: 2cm;
  }
  
  @page :left {
    margin-right: 3cm;
  }
  
  @page :right {
    margin-left: 3cm;
  }
}

/* ═══════════════════════════════════════════════════════════════
   11. PAGE-SPECIFIC COMPONENT STYLES (HOMEPAGE)
   ═══════════════════════════════════════════════════════════════ */

/* Hero Section - WCAG AAA Compliant */
.hero-section {
    background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #0891b2 100%);
    position: relative;
    overflow: hidden;
    color: white;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

/* Ensure all text in hero section is white with WCAG AAA contrast (12.63:1) */
.hero-section h1,
.hero-section h2,
.hero-section h3,
.hero-section h4,
.hero-section h5,
.hero-section h6,
.hero-section .h1,
.hero-section .h2,
.hero-section .h3,
.hero-section .h4,
.hero-section .h5,
.hero-section .h6,
.hero-section p,
.hero-section .lead,
.hero-section .display-1,
.hero-section .display-2,
.hero-section .display-3,
.hero-section .display-4,
.hero-section .display-5,
.hero-section .display-6,
.hero-section span,
.hero-section small,
.hero-section strong,
.hero-section div {
    color: white !important;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* Backdrop blur boxes - semi-transparent white backgrounds */
.hero-section .backdrop-blur {
    background-color: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
}

.hero-section .backdrop-blur .h2,
.hero-section .backdrop-blur .h1,
.hero-section .backdrop-blur h1,
.hero-section .backdrop-blur h2,
.hero-section .backdrop-blur h3,
.hero-section .backdrop-blur small,
.hero-section .backdrop-blur span,
.hero-section .backdrop-blur div {
    color: white !important;
}

/* Hero section badges - light background for readability */
.hero-section .badge,
.hero-section .btn-light {
    background-color: rgba(255, 255, 255, 0.95) !important;
    color: #1e3a8a !important;
    font-weight: 600;
    border: none;
}

/* Hero section buttons */
.hero-section .btn-outline-light {
    border-color: rgba(255, 255, 255, 0.9);
    color: white;
    background-color: transparent;
}

.hero-section .btn-outline-light:hover {
    background-color: white;
    color: #1e3a8a;
    border-color: white;
}

/* Hero section icons */
.hero-section i {
    color: white !important;
}

/* Module Cards */
.module-card {
    border-color: var(--gray-200);
    transition: all var(--transition-base);
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: white;
}

.module-card:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-xl) !important; /* Use existing shadow token */
    transform: translateY(-4px);
}

.module-card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.module-card-footer {
    margin-top: auto;
}

.module-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: var(--space-4);
    color: white;
    box-shadow: var(--shadow-md);
}

.module-icon-sm {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* Difficulty Badges - More semantic */
.difficulty-badge {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    color: white;
}

.badge-beginner { background-color: var(--brand-success); }
.badge-intermediate { background-color: var(--brand-accent); color: var(--gray-900);}
.badge-advanced { background-color: var(--brand-danger); }


/* Continue Learning Card */
.continue-card {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    border: none;
    color: white;
    transition: all var(--transition-base);
}

.continue-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg) !important;
    filter: brightness(1.1);
}

.continue-card .badge {
    background-color: white;
    color: var(--brand-primary);
    font-weight: 600;
}

/* Module Modal Enhancements */
.info-box {
    background-color: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.info-box:hover {
    background-color: var(--gray-100);
}

/* SVG Progress Circles */
svg text {
    font-family: var(--font-family-base);
}

/* ═══════════════════════════════════════════════════════════════
   12. MEDIA CONTENT ENHANCEMENTS (Images, Videos, Embeds)
   ═══════════════════════════════════════════════════════════════ */

/* Responsive Images - WCAG AAA Compliant */
/* Apply to content images only, not navbar/logo images */
img:not(.nav-brand-logo):not(.nav-brand img):not(.admin-brand-logo):not(.admin-brand img) {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

/* Base image styles for all images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Content Area Images */
.content-body img,
section img {
    margin: var(--space-6) auto;
    width: 100%;
}

/* Image with Link Hover Effect - Exclude navbar logo */
a:not(.nav-brand):not(.admin-brand) img:not(.nav-brand-logo):not(.admin-brand-logo) {
    transition: all var(--transition-base);
}

a:not(.nav-brand):not(.admin-brand):hover img:not(.nav-brand-logo):not(.admin-brand-logo) {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
    opacity: 0.95;
}

/* Figure with Caption Support */
figure {
    margin: var(--space-6) 0;
    text-align: center;
}

figure img {
    margin-bottom: var(--space-3);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

figcaption {
    font-size: var(--text-sm);
    color: var(--gray-600);
    font-style: italic;
    padding: var(--space-2) var(--space-4);
    background-color: var(--gray-50);
    border-radius: var(--radius-md);
    margin-top: var(--space-2);
}

/* Responsive Video Container - Perfect 16:9 Ratio */
.video-container,
.responsive-video {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    margin: var(--space-6) auto;
    background-color: var(--gray-900);
}

.video-container iframe,
.responsive-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: var(--radius-xl);
}

/* YouTube Embed Enhancement */
iframe[src*="youtube.com"],
iframe[src*="youtu.be"] {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* Card Container for Embedded Content */
.embed-card,
.media-card {
    max-width: 100%;
    margin: var(--space-6) auto;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: white;
    transition: all var(--transition-base);
}

.embed-card:hover,
.media-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.embed-card img,
.media-card img {
    width: 100%;
    margin: 0;
    border-radius: 0;
}

/* Twitter/Social Media Embed Container */
.twitter-tweet,
.social-embed {
    margin: var(--space-6) auto !important;
    max-width: 550px;
}

/* Menti/Poll Container Enhancement */
.poll-container .card-body {
    padding: 0;
}

.poll-container .ratio {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    overflow: hidden;
}

/* Image Gallery Grid (if you add multiple images) */
.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin: var(--space-6) 0;
}

.image-gallery img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    cursor: pointer;
    transition: all var(--transition-base);
}

.image-gallery img:hover {
    transform: scale(1.05);
    z-index: 1;
}

/* Image with Border/Frame Effect */
.framed-image {
    padding: var(--space-3);
    background-color: white;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-lg);
    margin: var(--space-6) auto;
    max-width: fit-content;
}

.framed-image img {
    margin: 0;
    box-shadow: none;
    border-radius: var(--radius-md);
}

/* Accessible Image Borders for Better Definition */
img:not([alt]) {
    border: 3px solid var(--brand-danger);
    /* Highlight images without alt text for accessibility */
}

/* Responsive iframe containers */
iframe:not(.ratio iframe) {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Print Optimization for Images */
@media print {
    img {
        max-width: 100%;
        page-break-inside: avoid;
    }
    
    .video-container,
    .responsive-video,
    iframe {
        display: none;
    }
    
    .video-container::after,
    .responsive-video::after {
        content: "[Video content - view online]";
        display: block;
        padding: var(--space-4);
        background-color: var(--gray-100);
        text-align: center;
    }
}

/* Mobile Optimizations for Media */
@media (max-width: 767.98px) {
    .video-container,
    .responsive-video {
        margin: var(--space-4) 0;
    }
    
    .embed-card,
    .media-card {
        margin: var(--space-4) 0;
        border-radius: var(--radius-lg);
    }
    
    img {
        margin: var(--space-4) 0;
    }
    
    .twitter-tweet {
        max-width: 100% !important;
    }
}


/* ═══════════════════════════════════════════════════════════════
   13. FOOTER SPECIFIC STYLES
   ═══════════════════════════════════════════════════════════════ */

/* Footer Logo Styles */
.footer-logo {
    display: inline-block;
    vertical-align: middle;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
    transition: all var(--transition-fast);
    margin-right: var(--space-2);
    margin-top: -2px; /* Fine-tune vertical alignment */
}

.footer-logo:hover {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.15));
    transform: scale(1.05);
}

/* Ensure footer heading displays inline with logo */
.col-md-4 .h5 {
    display: flex;
    align-items: center;
    line-height: 1;
}

/* Footer Brand Link - WCAG 2.2 AAA Compliant */
.footer-brand-link {
    color: var(--brand-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    padding: 2px 4px;
    margin: 0 -4px;
    position: relative;
}

/* Underline on hover for clear visual feedback */
.footer-brand-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 4px;
    right: 4px;
    height: 2px;
    background-color: var(--brand-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.footer-brand-link:hover {
    color: var(--brand-primary-dark);
    background-color: rgba(37, 99, 235, 0.08);
    text-decoration: none;
}

.footer-brand-link:hover::after {
    transform: scaleX(1);
}

/* Enhanced focus state for keyboard navigation - WCAG 2.2 AAA */
.footer-brand-link:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 3px;
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--brand-primary-dark);
}

/* Active/pressed state */
.footer-brand-link:active {
    background-color: rgba(37, 99, 235, 0.15);
    transform: translateY(1px);
}

/* Ensure sufficient color contrast in all states */
@media (prefers-contrast: high) {
    .footer-brand-link {
        text-decoration: underline;
        text-decoration-thickness: 2px;
        text-underline-offset: 3px;
    }
    
    .footer-brand-link:focus-visible {
        outline-width: 4px;
    }
}

/* ═══════════════════════════════════════════════════════════════
   14. INDEX PAGE SPECIFIC STYLES (Remove Inline CSS)
   ═══════════════════════════════════════════════════════════════ */

/* Overall Course Progress Bar - 10px height */
.progress-overall {
    height: 10px;
}

/* Module Progress Bars - 8px height */
.progress-module {
    height: 8px;
}

/* Hero Section Lead Text Opacity */
.lead-hero-opacity {
    opacity: 0.95;
}

/* Modal Progress Bar Container */
.modal-progress-bar-container {
    background-color: var(--gray-200);
    border-radius: var(--radius-full);
    height: 8px;
    overflow: hidden;
    margin-bottom: var(--space-3);
    position: relative;
}

/* Modal Progress Bar Fill */
.modal-progress-bar-fill {
    background: linear-gradient(90deg, var(--brand-primary), var(--brand-secondary));
    height: 100%;
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.modal-progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

/* Back to Top Button */
.btn-back-to-top {
    display: none;
    width: 50px;
    height: 50px;
    z-index: 1000;
}

.btn-back-to-top.show {
    display: block;
}

/* Ensure back to top button is properly sized */
.btn-back-to-top.btn {
    min-width: 50px;
    min-height: 50px;
    padding: 0;
}

/* Module Icon Gradients */
.gradient-blue {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
}

.gradient-cyan {
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
}

.gradient-green {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
}

.gradient-purple {
    background: linear-gradient(135deg, #9333ea 0%, #7c3aed 100%);
}

.gradient-orange {
    background: linear-gradient(135deg, #ea580c 0%, #dc2626 100%);
}

.gradient-red {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
}

.gradient-professional {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Course Introduction Card */
.course-intro-card {
    background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 50%, #0891b2 100%);
    position: relative;
    overflow: hidden;
    color: white;
}

.course-intro-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.08)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.course-intro-card .card-body {
    position: relative;
    z-index: 1;
}

/* Ensure all text in course intro card is white */
.course-intro-card h1,
.course-intro-card h2,
.course-intro-card h3,
.course-intro-card h4,
.course-intro-card h5,
.course-intro-card h6,
.course-intro-card p,
.course-intro-card .lead {
    color: white !important;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* Intro Icon */
.intro-icon {
    font-size: 8rem;
    color: rgba(255, 255, 255, 0.4);
    transition: all var(--transition-base);
}

.course-intro-card:hover .intro-icon {
    transform: scale(1.1) rotate(5deg);
    color: rgba(255, 255, 255, 0.6);
}

/* Hero Icon */
.hero-icon {
    font-size: 10rem;
    color: rgba(255, 255, 255, 0.3);
    animation: float 6s ease-in-out infinite;
}

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

/* Progress Circle Animation */
.progress-circle {
    transition: stroke-dasharray 1s ease-in-out;
}

/* Hover Lift Effect */
.hover-lift {
    transition: all var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Backdrop Blur Effect - Hero section stats */
.backdrop-blur {
    background-color: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Opacity Utilities */
.opacity-90 {
    opacity: 0.9;
}

.opacity-95 {
    opacity: 0.95;
}

/* ═══════════════════════════════════════════════════════════════
   15. MODAL ENHANCEMENTS FOR INDEX PAGE
   ═══════════════════════════════════════════════════════════════ */

/* Modal Module Specific Styles */
.modal-module .modal-content {
    border: none;
    border-radius: var(--radius-2xl);
    overflow: hidden;
}

.modal-module .modal-header {
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    color: white;
    border: none;
    padding: var(--space-6);
    position: relative;
}

.modal-header-content {
    position: relative;
    z-index: 1;
}

.modal-header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
}

.modal-icon-large {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    box-shadow: var(--shadow-lg);
}

.modal-difficulty-badge {
    font-size: var(--text-xs);
    padding: var(--space-2) var(--space-3);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    color: white;
    box-shadow: var(--shadow-sm);
}

.modal-title-section {
    margin-bottom: var(--space-4);
}

.modal-module-number {
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.9;
    display: block;
    margin-bottom: var(--space-2);
}

.modal-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
}

.modal-stats-row {
    display: flex;
    gap: var(--space-4);
    padding: var(--space-4);
    background-color: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
}

.modal-stat-item {
    flex: 1;
    text-align: center;
}

.modal-stat-icon {
    font-size: 1.5rem;
    opacity: 0.9;
    margin-bottom: var(--space-2);
}

.modal-stat-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-1);
}

.modal-stat-label {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.85;
}

/* Modal Body Sections */
.modal-description {
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: var(--space-5);
}

.modal-progress-section {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(8, 145, 178, 0.05));
    border: 1px solid rgba(37, 99, 235, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-5);
}

.modal-progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.modal-progress-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    display: flex;
    align-items: center;
}

.modal-progress-percentage {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--brand-primary);
}

.modal-progress-text {
    font-size: var(--text-sm);
    color: var(--gray-600);
    margin-top: var(--space-2);
}

.modal-section-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--gray-200);
}

.modal-section-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.modal-section-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

/* Modal Units Container */
.modal-units-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.modal-unit-group {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: white;
    box-shadow: var(--shadow-sm);
}

.modal-unit-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.modal-unit-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.modal-unit-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    flex: 1;
}

.modal-unit-count {
    font-size: var(--text-sm);
    color: var(--gray-600);
    background-color: var(--gray-100);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
}

.modal-lessons-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modal-lesson-item {
    border-bottom: 1px solid var(--gray-100);
}

.modal-lesson-item:last-child {
    border-bottom: none;
}

.modal-lesson-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--gray-700);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
}

.modal-lesson-link:hover {
    background-color: var(--gray-50);
    padding-left: calc(var(--space-4) + 4px);
}

.modal-lesson-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.modal-lesson-icon {
    font-size: 1.25rem;
    color: var(--gray-400);
    flex-shrink: 0;
}

.modal-lesson-link:hover .modal-lesson-icon {
    color: var(--brand-primary);
}

.modal-lesson-content {
    flex: 1;
}

.modal-lesson-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--gray-800);
    line-height: 1.4;
}

.modal-lesson-arrow {
    font-size: 1.25rem;
    color: var(--gray-400);
    transition: all var(--transition-fast);
}

.modal-lesson-link:hover .modal-lesson-arrow {
    color: var(--brand-primary);
    transform: translateX(4px);
}

/* Modal Footer */
.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    flex-wrap: wrap;
    gap: var(--space-3);
}

.modal-footer-info {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--gray-600);
    font-size: var(--text-sm);
}

.modal-footer-buttons {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.btn-modal-close {
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--gray-300);
    background-color: white;
    color: var(--gray-700);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    text-decoration: none;
}

.btn-modal-close:hover {
    background-color: var(--gray-100);
    border-color: var(--gray-400);
    color: var(--gray-900);
}

.btn-modal-primary {
    padding: var(--space-3) var(--space-5);
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    text-decoration: none;
    box-shadow: var(--shadow-md);
}

.btn-modal-primary:hover {
    background: linear-gradient(135deg, var(--brand-primary-dark), var(--brand-primary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* Modal Responsive Adjustments */
@media (max-width: 767.98px) {
    .modal-stats-row {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .modal-stat-item {
        display: flex;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }
    
    .modal-stat-icon {
        margin-bottom: 0;
    }
    
    .modal-footer {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-footer-buttons {
        flex-direction: column;
    }
    
    .btn-modal-close,
    .btn-modal-primary {
        width: 100%;
        justify-content: center;
    }
}

/* ═══════════════════════════════════════════════════════════════
   16. WCAG AAA CONTRAST FIXES FOR BOOTSTRAP COMPONENTS
   ═══════════════════════════════════════════════════════════════ */

/* Fix bg-success text contrast - use darker green for AAA compliance */
.card .card-header.bg-success,
.card-header.bg-success.text-white,
div.card-header.bg-success,
.card > .card-header.bg-success {
    background-color: #0f5132 !important; /* Darker green for 7:1 contrast with white */
    background-image: none !important;
    color: #ffffff !important;
}

.card-header.bg-success.text-white *,
.card .card-header.bg-success *,
.card-header.bg-success h1,
.card-header.bg-success h2,
.card-header.bg-success h3,
.card-header.bg-success h4,
.card-header.bg-success h5,
.card-header.bg-success h6,
.card-header.bg-success p,
.card-header.bg-success span,
.card-header.bg-success i {
    color: #ffffff !important;
}

/* Fix bg-danger text contrast - use darker red for AAA compliance */
.card .card-header.bg-danger,
.card-header.bg-danger.text-white,
div.card-header.bg-danger,
.card > .card-header.bg-danger {
    background-color: #991b1b !important; /* Darker red for 7:1 contrast with white */
    background-image: none !important;
    color: #ffffff !important;
}

.card-header.bg-danger.text-white *,
.card .card-header.bg-danger *,
.card-header.bg-danger h1,
.card-header.bg-danger h2,
.card-header.bg-danger h3,
.card-header.bg-danger h4,
.card-header.bg-danger h5,
.card-header.bg-danger h6,
.card-header.bg-danger p,
.card-header.bg-danger span,
.card-header.bg-danger i {
    color: #ffffff !important;
}

/* Ensure global bg-success/bg-danger utility backgrounds stay dark with white text */
.bg-success {
    background-color: #0f5132 !important;
    background-image: none !important;
    color: #ffffff !important;
}

.bg-danger {
    background-color: #991b1b !important;
    background-image: none !important;
    color: #ffffff !important;
}

/* ═══════════════════════════════════════════════════════════════
   END OF STYLESHEET
   ═══════════════════════════════════════════════════════════════ */