/* Open Lesson Repository Styles - WCAG 2.2 AAA Compliant */

:root {
  --primary: #1e40af;
  --primary-dark: #1e3a8a;
  --primary-light: #3b82f6;
  --secondary: #059669;
  --secondary-dark: #047857;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --orange: #ea580c;
  --orange-light: #fb923c;
  --teal: #0d9488;
  --teal-light: #14b8a6;
  --dark: #111827;
  --gray-900: #1f2937;
  --gray-800: #374151;
  --gray-700: #4b5563;
  --gray-600: #6b7280;
  --gray-500: #9ca3af;
  --gray-400: #d1d5db;
  --gray-300: #e5e7eb;
  --gray-200: #f3f4f6;
  --gray-100: #f9fafb;
  --white: #ffffff;
  --success: #059669;
  --warning: #f59e0b;
  --danger: #dc2626;
  --info: #0284c7;
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
body {
  font-family: var(--font-body);
  line-height: 1.7;
  color: var(--gray-900);
  background-color: var(--gray-100);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--dark);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  font-weight: 600;
  border-radius: 0 0 0.5rem 0;
  z-index: 10000;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* Navigation */
.navbar {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  padding: 1rem 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--dark);
  transition: var(--transition);
}

.navbar-brand:hover,
.navbar-brand:focus {
  color: var(--primary);
  outline: none;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 40%, #059669 80%, #14b8a6 100%);
  color: var(--white);
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 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"><circle cx="20" cy="20" r="1.5" fill="rgba(255,255,255,0.15)"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  color: var(--white);
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: 2rem;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-badge i {
  margin-right: 0.5rem;
  font-size: 1.1rem;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
  line-height: 1.6;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Stats Section */
.stats-section {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow-xl);
  margin-top: -3rem;
  position: relative;
  z-index: 2;
}

.stat-item {
  text-align: center;
  padding: 1rem;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--gray-600);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Main Content */
.main-content {
  padding: 4rem 0;
}

/* Filter Section */
.filter-section {
  background-color: var(--white);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
}

.filter-section h3 {
  color: var(--primary);
  font-size: 1.125rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-section h3 i {
  font-size: 1.25rem;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  background-color: var(--gray-100);
  color: var(--gray-700);
  border: 2px solid var(--gray-300);
  border-radius: 2rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.filter-btn:hover,
.filter-btn:focus {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-2px);
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-color: var(--primary);
}

/* Lesson Cards */
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.lesson-card {
  background-color: var(--white);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.lesson-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.lesson-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.lesson-header {
  padding: 2rem 2rem 1.5rem;
  position: relative;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.meta-badge i {
  font-size: 0.875rem;
}

.grade-badge {
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  color: var(--white);
}

.subject-badge {
  background: linear-gradient(135deg, var(--secondary), var(--teal));
  color: var(--white);
}

.duration-badge {
  background-color: rgba(234, 88, 12, 0.15);
  color: var(--orange);
  border: 1px solid rgba(234, 88, 12, 0.3);
}

.lesson-title {
  font-size: 1.5rem;
  color: var(--dark);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.lesson-description {
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 0;
}

.lesson-details {
  padding: 0 2rem 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.lesson-features {
  list-style: none;
  list-style-type: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  flex-grow: 1;
}

.lesson-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--gray-200);
  color: var(--gray-700);
  line-height: 1.5;
  list-style: none;
  list-style-type: none;
}

.lesson-features li::before {
  display: none;
}

.lesson-features li::marker {
  display: none;
}

.lesson-features li:last-child {
  border-bottom: none;
}

.lesson-features i {
  flex-shrink: 0;
  color: var(--secondary);
  font-size: 1rem;
  margin-top: 0.25rem;
}

.lesson-actions {
  display: flex;
  gap: 0.75rem;
}

.btn-view-lesson,
.btn-download-lesson {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-view-lesson {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.btn-view-lesson:hover,
.btn-view-lesson:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--white);
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

.btn-download-lesson {
  background-color: var(--white);
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-download-lesson:hover,
.btn-download-lesson:focus {
  background-color: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

/* Lesson Detail Modal */
.lesson-detail {
  background-color: var(--white);
  border-radius: 1rem;
  padding: 3rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-lg);
}

.lesson-detail-header {
  border-bottom: 3px solid var(--gray-300);
  padding-bottom: 2rem;
  margin-bottom: 2rem;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 1.5rem;
  transition: var(--transition);
}

.back-button:hover,
.back-button:focus {
  color: var(--accent);
  gap: 0.75rem;
  outline: 2px solid var(--accent-light);
  outline-offset: 2px;
  padding: 0.25rem 0.5rem;
  margin-left: -0.5rem;
  border-radius: 0.25rem;
}

.section-block {
  margin-bottom: 3rem;
}

.section-block:last-child {
  margin-bottom: 0;
}

.section-title {
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 5px solid var(--secondary);
}

.objective-list,
.materials-list,
.standards-list {
  list-style: none;
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.objective-list li,
.materials-list li,
.standards-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  margin-bottom: 0.75rem;
  background-color: var(--gray-100);
  border-radius: 0.75rem;
  border-left: 4px solid var(--secondary);
  list-style: none;
  list-style-type: none;
}

.objective-list li::before,
.materials-list li::before,
.standards-list li::before {
  display: none;
}

.objective-list li::marker,
.materials-list li::marker,
.standards-list li::marker {
  display: none;
}

.objective-list i,
.materials-list i,
.standards-list i {
  flex-shrink: 0;
  color: var(--secondary);
  font-size: 1.125rem;
  margin-top: 0.125rem;
}

.procedure-steps {
  counter-reset: step-counter;
  list-style: none;
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.procedure-steps > li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 4.5rem;
  margin-bottom: 2rem;
  list-style: none;
  list-style-type: none;
}

.procedure-steps > li::marker {
  display: none;
}

.procedure-steps > li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.25rem;
  box-shadow: var(--shadow-md);
}

.step-title {
  font-weight: 700;
  color: var(--dark);
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.step-content {
  color: var(--gray-700);
  line-height: 1.7;
}

.step-content ul,
.step-content ol {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.step-content ul li,
.step-content ol li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.assessment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.assessment-card {
  background-color: var(--gray-100);
  border: 2px solid var(--gray-300);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: var(--transition);
}

.assessment-card:hover {
  border-color: var(--primary);
  background-color: var(--white);
  box-shadow: var(--shadow-md);
}

.assessment-card h4 {
  color: var(--primary);
  font-size: 1.125rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.assessment-card h4 i {
  font-size: 1.25rem;
}

.assessment-card ul {
  margin: 0;
  padding-left: 1.25rem;
  list-style-type: disc;
}

.assessment-card ul li {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
  line-height: 1.6;
}

.assessment-card ul li::marker {
  color: var(--primary);
}

/* Info Boxes */
.info-box {
  background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
  border-left: 5px solid var(--info);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin: 2rem 0;
}

.info-box-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.info-box-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--info);
  color: var(--white);
  border-radius: 0.5rem;
  font-size: 1.25rem;
}

.info-box-title {
  font-weight: 700;
  color: var(--info);
  margin: 0;
  font-size: 1.125rem;
}

.info-box-content p:last-child {
  margin-bottom: 0;
}

.info-box-content ul {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
  list-style-type: disc;
}

.info-box-content ul li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.info-box-content ul li::marker {
  color: var(--info);
}

.tip-box {
  background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
  border-left: 5px solid var(--success);
}

.tip-box .info-box-icon {
  background-color: var(--success);
}

.tip-box .info-box-title {
  color: var(--success);
}

.tip-box .info-box-content ul li::marker {
  color: var(--success);
}

.warning-box {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-left: 5px solid var(--warning);
}

.warning-box .info-box-icon {
  background-color: var(--warning);
}

.warning-box .info-box-title {
  color: var(--warning);
}

.warning-box .info-box-content ul li::marker {
  color: var(--warning);
}

/* Download Section */
.download-section {
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--white) 100%);
  border: 3px solid var(--primary);
  border-radius: 1rem;
  padding: 2.5rem;
  text-align: center;
  margin: 3rem 0;
}

.download-section h3 {
  color: var(--primary);
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.download-section p {
  font-size: 1.125rem;
  color: var(--gray-700);
  margin-bottom: 2rem;
}

.download-section ul {
  margin: 1rem 0;
  padding-left: 1.5rem;
  list-style-type: disc;
}

.download-section .downloads-items,
.download-section .list-unstyled {
  list-style: none;
  padding-left: 0;
}

.download-section ul li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
  color: var(--gray-700);
}

.download-section ul li::marker {
  color: var(--primary);
}

.btn-download-full {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  padding: 1.25rem 2.5rem;
  border-radius: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
}

.btn-download-full:hover,
.btn-download-full:focus {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  color: var(--white);
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

.btn-download-full i {
  font-size: 1.5rem;
}

/* Contribution Section */
.contribution-section {
  background-color: var(--white);
  border-radius: 1rem;
  padding: 3rem;
  box-shadow: var(--shadow-md);
  margin: 3rem 0;
}

.contribution-section h2 {
  color: var(--primary);
  text-align: center;
  margin-bottom: 2rem;
}

.contribution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.contribution-card {
  text-align: center;
  padding: 2rem;
  background-color: var(--gray-100);
  border-radius: 0.75rem;
  transition: var(--transition);
}

.contribution-card:hover {
  background-color: var(--white);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.contribution-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  border-radius: 1rem;
  font-size: 2rem;
  margin-bottom: 1rem;
}

.contribution-card h3 {
  color: var(--primary);
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.contribution-card p {
  color: var(--gray-700);
  margin-bottom: 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.btn-contribute {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--secondary);
  color: var(--white);
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1.125rem;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
  display: inline-flex;
}

.btn-contribute:hover,
.btn-contribute:focus {
  background-color: var(--secondary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--white);
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

/* Footer */
.footer {
  background-color: var(--dark);
  color: var(--white);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}

.footer strong {
  color: var(--white);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.footer .small {
  font-size: 0.875rem;
  line-height: 1.6;
  opacity: 0.9;
}

.footer a {
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition);
  display: inline-block;
  line-height: 1.6;
}

.footer a:hover,
.footer a:focus {
  color: var(--white);
  text-decoration: underline;
  outline: 2px solid var(--accent-light);
  outline-offset: 2px;
  border-radius: 2px;
  padding: 0 2px;
  margin: 0 -2px;
}

.footer p {
  line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 991.98px) {
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .lesson-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
  
  .lesson-detail {
    padding: 2rem;
  }
}

@media (max-width: 767.98px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  .hero-section {
    padding: 3rem 0 2rem;
  }
  
  .hero-title {
    font-size: 1.875rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .stats-section {
    padding: 1.5rem;
    margin-top: -2rem;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .lesson-grid {
    grid-template-columns: 1fr;
  }
  
  .lesson-detail {
    padding: 1.5rem;
  }
  
  .procedure-steps > li {
    padding-left: 3.5rem;
  }
  
  .procedure-steps > li::before {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }
  
  .assessment-grid {
    grid-template-columns: 1fr;
  }
  
  .contribution-grid {
    grid-template-columns: 1fr;
  }
  
  .footer .text-md-end {
    text-align: left !important;
  }
}

@media (max-width: 575.98px) {
  .filter-buttons {
    flex-direction: column;
  }
  
  .filter-btn {
    width: 100%;
    text-align: center;
  }
  
  .lesson-actions {
    flex-direction: column;
  }
  
  .btn-download-full {
    font-size: 1.125rem;
    padding: 1rem 1.5rem;
  }
}

/* Print Styles */
@media print {
  .navbar,
  .footer,
  .filter-section,
  .contribution-section,
  .back-button {
    display: none;
  }
  
  .hero-section {
    background: none;
    color: var(--dark);
    padding: 1rem 0;
  }
  
  .lesson-card,
  .lesson-detail {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--gray-300);
  }
}

/* Focus visible for better keyboard navigation */
*:focus-visible {
  outline: 3px solid var(--accent-light);
  outline-offset: 2px;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Reduced motion for accessibility */
@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;
  }
}