/* ============================================
   PREMIUM LEARNING HUB - Final Polish
   Modern Driving Theory Learning Platform
   ============================================ */

/* Color System */
:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --primary-lightest: #dbeafe;
  --secondary: #4f46e5;
  --accent: #06b6d4;
  --success: #16a34a;
  --success-light: #22c55e;
  --success-bg: #dcfce7;
  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --warning-bg: #fef3c7;
  --error: #dc2626;
  --error-light: #ef4444;
  --error-bg: #fee2e2;
  --info: #0ea5e9;
  --info-light: #38bdf8;
  --info-bg: #e0f2fe;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --bg-page: #f8fbff;
  --bg-white: #ffffff;
  --bg-light: #f5f7fb;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 250ms ease;
}

/* Premium Breadcrumb */
.learning-breadcrumb-premium {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  margin-bottom: 0.75rem;
  margin-top: 0;
  flex-wrap: wrap;
}

.breadcrumb-link {
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast);
  font-weight: 500;
}

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

.breadcrumb-separator {
  color: var(--text-muted);
  font-weight: 300;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 600;
}

/* Hero Sign Section */
.learning-hero-card {
  position: relative;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  border-radius: var(--radius-xl);
  padding: 25px 1.5rem;
  margin-bottom: 0.875rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-background-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.1;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
}

/* Hero Title Section */
.hero-title-section {
  text-align: center;
  margin-top: 0.5rem;
  margin-bottom: 0.375rem;
}

.hero-title-text {
  font-size: 1.875rem;
  font-weight: 700;
  color: white;
  margin: 0;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.01em;
}

/* Hero Explanation */
.hero-explanation {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 0.75rem 1rem;
  max-width: 1200px;
  width: 100%;
  margin-top: 0;
}

.hero-explanation-icon {
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--info);
  font-size: 1rem;
  flex-shrink: 0;
}

.hero-explanation-text {
  flex: 1;
}

.hero-explanation-text p {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-xl);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition-fast);
}

.hero-badge:hover {
  transform: translateY(-1px);
}

.hero-badge i {
  color: var(--primary);
}

/* Sign Image Card - Enhanced */
.sign-image-card {
  background: transparent;
  border-radius: var(--radius-lg);
  padding: 0.875rem;
  box-shadow: none;
  transition: all var(--transition-normal);
  width: 155px;
  height: 155px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  position: relative;
  overflow: visible;
}

.sign-image-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: -1;
}

.sign-image-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.sign-image-card:hover::before {
  opacity: 1;
}

.sign-image {
  max-width: 205px;
  max-height: 205px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.sign-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  padding: 2rem;
}

/* Unified Lesson Card */
.lesson-card-unified {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-normal);
}

.lesson-card-unified:hover {
  box-shadow: var(--shadow-lg);
}

/* Status Pills */
.lesson-status-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-light);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  transition: transform var(--transition-fast);
}

.status-pill:hover {
  transform: translateY(-1px);
}

.pill-primary {
  background: var(--primary-lightest);
  color: var(--primary-dark);
}

.pill-info {
  background: var(--info-bg);
  color: #0369a1;
}

.pill-warning {
  background: var(--warning-bg);
  color: #d97706;
}

.pill-success {
  background: var(--success-bg);
  color: #15803d;
}

.pill-secondary {
  background: #f1f5f9;
  color: var(--text-secondary);
}

/* Lesson Sections */
.lesson-explanation-section {
  margin-bottom: 0;
}

.lesson-quiz-section {
  margin-top: 0;
}

.lesson-section-header {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 0.75rem;
}

.lesson-section-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.lesson-section-icon:hover {
  transform: scale(1.05);
}

.explanation-icon {
  background: linear-gradient(135deg, var(--info-light), var(--info));
  color: white;
  box-shadow: var(--shadow-sm);
}

.quiz-icon {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: var(--shadow-sm);
}

.lesson-section-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.01em;
}

.lesson-section-subtitle {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0.25rem 0 0 0;
  font-weight: 500;
}

.lesson-explanation-content {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.lesson-explanation-content p {
  margin: 0;
}

.lesson-section-divider {
  height: 1px;
  background: var(--border-light);
  margin: 1.5rem 0;
}

/* Integrated Quiz Section */
.quiz-section-integrated {
  margin-top: 0;
}

/* Question Header with Icon */
.quiz-question-header-integrated {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  margin-bottom: 0.75rem;
}

.quiz-question-text-integrated {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.6;
  letter-spacing: -0.01em;
  flex: 1;
  padding-top: 0.25rem;
}

/* Quiz Options - Vertical Stack */
.quiz-options-grid-integrated {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-bottom: 0.875rem;
  width: 100%;
}

.quiz-option-card-integrated {
  position: relative;
  display: block;
  width: 100%;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-option-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.quiz-option-content-integrated {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1.125rem;
  background: var(--bg-white);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  width: 100%;
  box-sizing: border-box;
}

.quiz-option-card-integrated:hover .quiz-option-content-integrated {
  border-color: var(--primary-light);
  background: var(--primary-lightest);
  transform: translateX(2px);
}

.quiz-option-card-integrated.selected .quiz-option-content-integrated {
  border-color: var(--primary);
  background: var(--primary-lightest);
  box-shadow: var(--shadow-glow);
}

.quiz-option-card-integrated.correct .quiz-option-content-integrated {
  border-color: var(--success);
  background: var(--success-bg);
  animation: pulseSuccess 0.4s ease;
}

.quiz-option-card-integrated.incorrect .quiz-option-content-integrated {
  border-color: var(--error);
  background: var(--error-bg);
  animation: shake 0.4s ease;
}

.quiz-option-number-integrated {
  width: 32px;
  height: 32px;
  background: var(--bg-light);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option-card-integrated.selected .quiz-option-number-integrated {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.quiz-option-card-integrated.correct .quiz-option-number-integrated {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

.quiz-option-card-integrated.incorrect .quiz-option-number-integrated {
  background: var(--error);
  border-color: var(--error);
  color: white;
}

.quiz-option-text-integrated {
  flex: 1;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
}

.quiz-option-check-integrated {
  opacity: 0;
  color: var(--primary);
  font-size: 1.125rem;
  transition: opacity var(--transition-fast);
}

.quiz-option-card-integrated.selected .quiz-option-check-integrated {
  opacity: 1;
}

/* Quiz Submit Button */
.btn-quiz-submit-integrated {
  width: 100%;
  padding: 0.9375rem 1.75rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  letter-spacing: 0.01em;
}

.btn-quiz-submit-integrated:hover:not(.disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
}

.btn-quiz-submit-integrated:active:not(.disabled) {
  transform: translateY(0);
}

.btn-quiz-submit-integrated.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-quiz-submit-icon {
  font-size: 1rem;
}

/* Quiz Feedback */
.quiz-feedback-integrated {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  animation: slideDown 0.3s ease;
}

.feedback-content-integrated {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
}

.feedback-icon-wrapper-integrated {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feedback-icon {
  font-size: 1.125rem;
}

.feedback-text-wrapper-integrated {
  flex: 1;
}

.feedback-title-integrated {
  font-weight: 600;
  margin: 0 0 0.375rem 0;
  font-size: 0.9375rem;
  line-height: 1.4;
}

.feedback-message-integrated {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.feedback-success {
  background: var(--success-bg);
  border: 2px solid var(--success);
}

.feedback-success .feedback-icon-wrapper-integrated {
  background: var(--success);
  color: white;
}

.feedback-success .feedback-title-integrated {
  color: #15803d;
}

.feedback-success .feedback-message-integrated {
  color: #15803d;
}

.feedback-error {
  background: var(--error-bg);
  border: 2px solid var(--error);
}

.feedback-error .feedback-icon-wrapper-integrated {
  background: var(--error);
  color: white;
}

.feedback-error .feedback-title-integrated {
  color: #b91c1c;
}

.feedback-error .feedback-message-integrated {
  color: #b91c1c;
}

.feedback-warning {
  background: var(--warning-bg);
  border: 2px solid var(--warning);
}

.feedback-warning .feedback-icon-wrapper-integrated {
  background: var(--warning);
  color: white;
}

.feedback-warning .feedback-title-integrated {
  color: #d97706;
}

.feedback-warning .feedback-message-integrated {
  color: #d97706;
}

.feedback-info {
  background: var(--info-bg);
  border: 2px solid var(--info);
}

.feedback-info .feedback-icon-wrapper-integrated {
  background: var(--info);
  color: white;
}

.feedback-info .feedback-title-integrated {
  color: #0284c7;
}

.feedback-info .feedback-message-integrated {
  color: #0284c7;
}

/* Premium Navigation */
.learning-nav-premium {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 0.875rem;
  margin-top: 0.875rem;
  border-top: 2px solid var(--border-light);
  flex-wrap: wrap;
}

.nav-group {
  flex: 1;
  min-width: 120px;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.25rem;
  background: var(--bg-white);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
  width: 100%;
}

.btn-nav:hover {
  border-color: var(--primary);
  background: var(--primary-lightest);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-nav-prev {
  justify-content: flex-start;
}

.btn-nav-next {
  justify-content: flex-end;
}

.btn-nav-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-nav-thumb {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 6px;
  flex-shrink: 0;
}

/* Progress Dashboard Card */
.progress-dashboard-card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 1rem;
}

.progress-dashboard-card.progress-stats-collapsed {
  opacity: 0;
  transform: translateY(-24px);
  pointer-events: none;
}

.progress-dashboard-card.progress-stats-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  animation: slideDown 0.4s ease forwards;
}

.progress-header {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.875rem;
  border-bottom: 2px solid var(--border-light);
}

.progress-header-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--info));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.125rem;
  box-shadow: var(--shadow-sm);
}

.progress-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.01em;
}

/* Overall Progress */
.progress-overall {
  margin-bottom: 1.5rem;
}

.progress-bar-wrapper {
  width: 100%;
  height: 12px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.5rem;
  transition: width 0.5s ease;
  position: relative;
}

.progress-bar-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.progress-bar-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
  font-weight: 500;
}

/* Stats Grid */
.progress-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin-bottom: 1.5rem;
}

.progress-stat-card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem;
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.progress-stat-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.stat-learned {
  background: linear-gradient(135deg, #dbeafe, #bfdbfe);
  border-left: 4px solid var(--primary);
}

.stat-correct {
  background: linear-gradient(135deg, #dcfce7, #bbf7d0);
  border-left: 4px solid var(--success);
}

.stat-review {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-left: 4px solid var(--warning);
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.stat-learned .stat-icon {
  background: var(--primary);
  color: white;
}

.stat-correct .stat-icon {
  background: var(--success);
  color: white;
}

.stat-review .stat-icon {
  background: var(--warning);
  color: white;
}

.stat-content {
  flex: 1;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Success Rate */
.progress-success-rate {
  padding-top: 1.25rem;
  border-top: 2px solid var(--border-light);
}

.success-rate-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.success-rate-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.success-rate-value {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--success);
}

.success-rate-bar-wrapper {
  width: 100%;
  height: 8px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.success-rate-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--success-light), var(--success));
  border-radius: var(--radius-sm);
  transition: width 0.5s ease;
}

/* Animations */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseSuccess {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-4px);
  }
  75% {
    transform: translateX(4px);
  }
}

/* Category Grid (for index pages) */
.learning-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
  width: 100%;
}

/* Centered grid for group selection page */
.learning-category-grid-centered {
  justify-items: center;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  max-width: 1200px;
  margin: 0 auto;
}

@media (min-width: 576px) {
  .learning-category-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 2rem;
  }
  
  .learning-category-grid-centered {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (min-width: 992px) {
  .learning-category-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 2rem;
  }
  
  .learning-category-grid-centered {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}

.learning-category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1.5rem;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
  min-height: 240px;
  width: 100%;
}

.learning-category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-light);
  color: inherit;
}

.learning-category-card-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 2rem;
  background: linear-gradient(135deg, var(--primary-lightest), var(--info-bg));
  color: var(--primary);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.learning-category-card:hover .learning-category-card-icon {
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

/* Traffic Sign Shapes */
.traffic-sign-shape {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  position: relative;
}

.traffic-sign-shape i {
  font-size: 2rem;
  z-index: 2;
  position: relative;
}

/* Warning Sign - Triangle (White with Red Border) - Realistic */
.traffic-sign-warning .traffic-sign-shape.triangle {
  width: 80px;
  height: 70px;
  position: relative;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
}

.traffic-sign-warning .traffic-sign-shape.triangle::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 80px;
  height: 70px;
  clip-path: polygon(50% 5%, 5% 95%, 95% 95%);
  background: #dc2626;
  z-index: 1;
}

.traffic-sign-warning .traffic-sign-shape.triangle::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 6px;
  width: 68px;
  height: 58px;
  clip-path: polygon(50% 5%, 5% 95%, 95% 95%);
  background: white;
  z-index: 2;
}

.traffic-sign-warning .traffic-sign-shape.triangle i {
  position: absolute;
  top: 55%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #dc2626;
  font-size: 1.75rem;
  z-index: 3;
  font-weight: 900;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.traffic-sign-warning {
  background: transparent !important;
}

/* Regulatory Sign - Circle (White with Red Border) - Realistic */
.traffic-sign-regulatory .traffic-sign-shape.circle {
  width: 85px;
  height: 85px;
  border-radius: 50%;
  background: white;
  border: 6px solid #dc2626;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
  position: relative;
}

.traffic-sign-regulatory .traffic-sign-shape.circle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #dc2626;
  opacity: 0.15;
  z-index: 1;
}

.traffic-sign-regulatory .traffic-sign-shape.circle i {
  color: #dc2626;
  font-size: 2rem;
  position: relative;
  z-index: 2;
  font-weight: 900;
}

.traffic-sign-regulatory {
  background: transparent !important;
}

/* Information Sign - Square (Blue) */
.traffic-sign-information .traffic-sign-shape.square {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  background: #2563eb;
  border: 3px solid white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.traffic-sign-information .traffic-sign-shape.square i {
  color: white;
  font-size: 1.75rem;
}

.traffic-sign-information {
  background: transparent !important;
}

/* Parking Sign - Rectangle (Blue) */
.traffic-sign-parking .traffic-sign-shape.rectangle {
  width: 70px;
  height: 90px;
  border-radius: 6px;
  background: #2563eb;
  border: 3px solid white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.traffic-sign-parking .traffic-sign-shape.rectangle i {
  color: white;
  font-size: 2.5rem;
  font-weight: bold;
}

.traffic-sign-parking {
  background: transparent !important;
}

.learning-category-card-icon .learning-category-card-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-lg);
  max-width: 100%;
  max-height: 100%;
  padding: 0;
}

/* Remove blue/gradient box when card shows actual sign image (Trafik Polisi, Trafik Işıkları, Yol Çizgileri, Trafik İşaretleri items) */
.learning-category-card-icon:has(.learning-category-card-img) {
  background: transparent;
  box-shadow: none;
}

/* Traffic sign image icon for buttons - Maximum size within container */
.traffic-sign-image-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-lg);
  display: block;
  max-width: 100%;
  max-height: 100%;
}

/* Ensure icon container displays images properly - Maximum size with no padding */
.traffic-sign-warning .traffic-sign-image-icon,
.traffic-sign-regulatory .traffic-sign-image-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0;
  max-width: 100%;
  max-height: 100%;
}

/* Remove background for containers with actual sign images */
.traffic-sign-warning,
.traffic-sign-regulatory {
  background: transparent !important;
  padding: 0;
}

.learning-category-card-title {
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  color: var(--text-primary);
  width: 100%;
}

/* Empty State */
.learning-empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-light);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
}

/* Page Background */
.section-white {
  background: var(--bg-page);
}

/* Compact spacing for learning detail pages */
.section-white.section-standard {
  padding-top: 2px !important;
}

.section-white.section-standard .container {
  padding-top: 0;
}

/* Responsive Design */
@media (max-width: 991.98px) {
  .learning-hero-card {
    padding: 30px 1.25rem;
  }

  .sign-image-card {
    width: 142px;
    height: 142px;
    padding: 0.75rem;
  }

  .sign-image {
    max-width: 123px;
    max-height: 123px;
  }

  .progress-dashboard-card {
    position: static;
    margin-top: 1.5rem;
  }

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

  .learning-nav-premium {
    flex-direction: column;
  }

  .nav-group {
    width: 100%;
  }
}

@media (max-width: 767.98px) {
  .learning-breadcrumb-premium {
    font-size: 0.75rem;
    margin-bottom: 1.25rem;
  }

  .learning-hero-card {
    padding: 25px 1rem;
    border-radius: var(--radius-lg);
  }

  .sign-image-card {
    width: 130px;
    height: 130px;
    padding: 0.625rem;
  }

  .sign-image {
    max-width: 114px;
    max-height: 114px;
  }

  .lesson-card-unified {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
  }

  .lesson-status-pills {
    gap: 0.375rem;
  }

  .status-pill {
    font-size: 0.6875rem;
    padding: 0.3125rem 0.625rem;
  }

  .progress-stats-grid {
    grid-template-columns: 1fr;
  }

  .progress-dashboard-card {
    border-radius: var(--radius-lg);
  }
}

@media (max-width: 575.98px) {
  .learning-hero-card {
    padding: 20px 0.75rem;
  }

  .hero-badge {
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
  }

  .sign-image-card {
    width: 117px;
    height: 117px;
    padding: 0.5rem;
  }

  .sign-image {
    max-width: 104px;
    max-height: 104px;
  }

  .lesson-card-unified {
    padding: 1.25rem;
  }

  .quiz-option-content-integrated {
    padding: 0.75rem 1rem;
  }

  .btn-quiz-submit-integrated {
    padding: 0.8125rem 1.5rem;
    font-size: 0.875rem;
  }
}