/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
  /* Colors */
  --primary-color: #2196F3;
  --secondary-color: #4CAF50;
  --success-color: #4CAF50;
  --error-color: #f44336;
  --warning-color: #FF9800;
  --info-color: #2196F3;

  --text-primary: #212121;
  --text-secondary: #757575;
  --text-light: #BDBDBD;

  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --bg-tertiary: #EEEEEE;

  --correct-bg: #E8F5E9;
  --error-bg: #FFEBEE;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.16);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* Dark mode theme */
:root.dark-mode,
html.dark-mode,
body.dark-mode {
  --text-primary: #E0E0E0;
  --text-secondary: #A0A0A0;
  --text-light: #616161;

  --bg-primary: #121212;
  --bg-secondary: #1E1E1E;
  --bg-tertiary: #2A2A2A;

  --correct-bg: #1B5E20;
  --error-bg: #B71C1C;

  /* Adjust shadows for dark mode */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.8);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   App Container
   ============================================ */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Screen Base Styles
   ============================================ */
.screen {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: opacity var(--transition-base);
}

.screen.hidden {
  display: none;
  opacity: 0;
  pointer-events: none;
}

/* ============================================
   Loading Screen
   ============================================ */
.loading-screen {
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-screen p {
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* ============================================
   Welcome Screen
   ============================================ */
.welcome-screen {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-md);
}

.welcome-container {
  max-width: 500px;
  width: 100%;
}

.welcome-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.welcome-header h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-sm);
}

.welcome-header p {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

.welcome-illustration {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.car-emoji {
  font-size: 80px;
  animation: bounce 2s ease-in-out infinite;
}

.welcome-form {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--bg-tertiary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.welcome-features {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  color: var(--text-primary);
}

.welcome-features h3 {
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.welcome-features ul {
  list-style: none;
}

.welcome-features li {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-lg);
  position: relative;
}

.welcome-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 2px;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: none;
  font-family: var(--font-family);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-user-select: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-base), height var(--transition-base);
}

.btn:hover:not(:disabled)::before {
  width: 300px;
  height: 300px;
}

.btn:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn:active:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: #1565C0;
  color: white;
  border: 2px solid #1565C0;
  font-weight: 700;
}

.btn-primary:hover:not(:disabled) {
  background-color: #0D47A1;
  border-color: #0D47A1;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
  border: 2px solid var(--secondary-color);
  font-weight: 700;
}

.btn-secondary:hover:not(:disabled) {
  background-color: #388E3C;
  border-color: #388E3C;
}

.btn-tertiary {
  background-color: #E8E8E8;
  color: #212121;
  border: 2px solid #BDBDBD;
  font-weight: 700;
}

.btn-tertiary:hover:not(:disabled) {
  background-color: #D0D0D0;
  border-color: #1976D2;
  color: #212121;
}

.btn-danger {
  background-color: var(--error-color);
  color: white;
  border: 2px solid var(--error-color);
  font-weight: 700;
}

.btn-danger:hover:not(:disabled) {
  background-color: #d32f2f;
  border-color: #d32f2f;
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: var(--font-size-lg);
  width: 100%;
  margin-bottom: var(--spacing-md);
}

.btn-block {
  width: 100%;
  margin-bottom: var(--spacing-md);
}

.btn-icon {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  cursor: pointer;
  font-size: var(--font-size-2xl);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
  color: white;
}

.btn-icon:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* ============================================
   Dashboard Screen
   ============================================ */
.dashboard-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-md);
  gap: var(--spacing-md);
}

.dashboard-header h1 {
  font-size: var(--font-size-2xl);
}

.header-buttons {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.dashboard-main {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.stats-section {
  margin-bottom: var(--spacing-xl);
}

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

.stat-card {
  background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
  border: 1px solid rgba(33, 150, 243, 0.08);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, #FFFFFF 0%, #E3F2FD 100%);
}

.stat-card:hover::before {
  transform: scaleX(1);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: #212121;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 700;
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
}

.progress-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.progress-section h2 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
  color: #212121;
  font-weight: 700;
}

.progress-container {
  width: 100%;
}

.progress-bar-bg {
  width: 100%;
  height: 12px;
  background-color: var(--bg-tertiary);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
  position: relative;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 8px;
  transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  width: 0%;
  box-shadow: 0 2px 6px rgba(76, 175, 80, 0.4);
  position: relative;
  overflow: hidden;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.3) 50%,
    rgba(255, 255, 255, 0)
  );
  animation: shimmer 2s infinite;
}

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

.progress-text {
  font-size: var(--font-size-sm);
  color: #212121;
  font-weight: 600;
}

.actions-section {
  margin-bottom: var(--spacing-xl);
}

.category-stats-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.category-stats-section h3 {
  margin-bottom: var(--spacing-md);
}

.category-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.category-stat {
  padding: var(--spacing-md);
  border-left: 4px solid var(--primary-color);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.category-name {
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #212121;
}

.category-progress {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.progress-bar {
  flex: 1;
  height: 4px;
  background-color: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.category-percent {
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: #1565C0;
}

.category-details {
  font-size: var(--font-size-xs);
  color: #212121;
  font-weight: 600;
}

/* ============================================
   Practice Test Screen
   ============================================ */
.test-header {
  background: white;
  border-bottom: 1px solid var(--bg-tertiary);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.test-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: 600;
}

.test-main {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.category-badge {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: var(--spacing-lg);
  width: fit-content;
}

.question-section {
  margin-bottom: var(--spacing-xl);
}

.question-text {
  font-size: var(--font-size-xl);
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-primary);
}

.options-section {
  margin-bottom: var(--spacing-xl);
}

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

.answer-option {
  display: flex;
  width: 100%;
  padding: var(--spacing-lg);
  margin: 0;
  text-align: left;
  border: 2px solid var(--bg-tertiary);
  background-color: white;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: 60px;
  align-items: center;
  position: relative;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.answer-option::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(76, 175, 80, 0) 0%, rgba(76, 175, 80, 0.1) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.answer-option:hover:not(:disabled) {
  border-color: var(--primary-color);
  background-color: rgba(33, 150, 243, 0.08);
  transform: translateX(6px) translateY(-2px);
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.2);
}

.answer-option:hover:not(:disabled)::before {
  opacity: 1;
}

.answer-option:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.25), 0 4px 12px rgba(0, 0, 0, 0.1);
}

.answer-option:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

/* ============================================
   Feedback Container
   ============================================ */
.feedback-container {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  animation: slideInUp 0.4s ease-out;
}

.feedback-container.correct {
  background-color: var(--correct-bg);
  border-left: 4px solid var(--secondary-color);
}

.feedback-container.incorrect {
  background-color: var(--error-bg);
  border-left: 4px solid var(--error-color);
}

.feedback-container.hidden {
  display: none;
}

.feedback-message {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.checkmark,
.x-mark {
  font-size: var(--font-size-2xl);
  margin-right: var(--spacing-md);
}

.checkmark {
  color: var(--secondary-color);
}

.x-mark {
  color: var(--error-color);
}

.explanation {
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
}

.mastery-message {
  background-color: rgba(255, 193, 7, 0.2);
  border-left: 4px solid var(--warning-color);
  padding: var(--spacing-md);
  margin-top: var(--spacing-md);
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.test-navigation {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/* ============================================
   Test Complete Screen
   ============================================ */
.complete-header {
  background: linear-gradient(135deg, #4CAF50 0%, #2E7D32 100%);
  color: white;
  padding: var(--spacing-xl);
  text-align: center;
}

.complete-header h1 {
  font-size: var(--font-size-3xl);
}

.complete-main {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.results-section {
  margin-bottom: var(--spacing-xl);
}

.results-summary {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.score-circle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  margin: 0 auto;
}

.score-percentage {
  font-size: var(--font-size-3xl);
  font-weight: 700;
}

.score-text {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.score-breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.score-line {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.result-message {
  font-size: var(--font-size-base);
  color: #212121;
  font-weight: 600;
}

.category-breakdown-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.category-breakdown {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.category-breakdown h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.category-result {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary-color);
}

.category-result span:first-child {
  font-weight: 600;
}

.category-result span:last-child {
  color: #212121;
  font-weight: 600;
}

.complete-actions {
  margin-top: var(--spacing-xl);
}

/* ============================================
   Settings Screen
   ============================================ */
.settings-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-md);
  gap: var(--spacing-md);
}

.settings-header h1 {
  font-size: var(--font-size-2xl);
}

.settings-main {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.settings-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.settings-section h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  font-size: var(--font-size-lg);
}

.settings-section.info-section p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
  color: #212121;
  font-weight: 600;
}

.settings-section a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.settings-section a:hover {
  text-decoration: underline;
}

/* ============================================
   Error Notification
   ============================================ */
.error-notification {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--error-color);
  color: white;
  padding: var(--spacing-lg);
  text-align: center;
  z-index: 1000;
  animation: slideUp 0.3s ease-out;
  transition: transform 0.3s ease-out;
  transform: translateY(100%);
}

.error-notification.show {
  transform: translateY(0);
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

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

/* ============================================
   Dark Mode Explicit Overrides
   ============================================ */
html.dark-mode body,
body.dark-mode {
  background-color: #1E1E1E;
  color: #E0E0E0;
}

html.dark-mode .stat-card,
body.dark-mode .stat-card {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .progress-section,
body.dark-mode .progress-section {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .category-stats-section,
body.dark-mode .category-stats-section {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .settings-section,
body.dark-mode .settings-section {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .results-summary,
body.dark-mode .results-summary {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .category-breakdown-section,
body.dark-mode .category-breakdown-section {
  background-color: #2A2A2A;
  color: #E0E0E0;
}

html.dark-mode .test-header,
body.dark-mode .test-header {
  background-color: #1E1E1E;
  border-bottom-color: #2A2A2A;
}

html.dark-mode .answer-option,
body.dark-mode .answer-option {
  background-color: #2A2A2A;
  color: #E0E0E0;
  border-color: #3A3A3A;
}

html.dark-mode .answer-option:hover:not(:disabled),
body.dark-mode .answer-option:hover:not(:disabled) {
  background-color: rgba(33, 150, 243, 0.15);
  border-color: #2196F3;
}

html.dark-mode .progress-bar-bg,
body.dark-mode .progress-bar-bg {
  background-color: #2A2A2A;
}

html.dark-mode .category-stat,
body.dark-mode .category-stat {
  background-color: #2A2A2A;
  border-left-color: #2196F3;
}

html.dark-mode .form-group input,
html.dark-mode .form-group textarea,
html.dark-mode .form-group select,
body.dark-mode .form-group input,
body.dark-mode .form-group textarea,
body.dark-mode .form-group select {
  background-color: #2A2A2A;
  color: #E0E0E0;
  border-color: #3A3A3A;
}

html.dark-mode .form-group input:focus,
html.dark-mode .form-group textarea:focus,
html.dark-mode .form-group select:focus,
body.dark-mode .form-group input:focus,
body.dark-mode .form-group textarea:focus,
body.dark-mode .form-group select:focus {
  border-color: #2196F3;
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
}

/* Dark mode button contrast */
html.dark-mode .btn-tertiary,
body.dark-mode .btn-tertiary {
  background-color: #3A3A3A;
  color: #E0E0E0;
  border-color: #555555;
}

html.dark-mode .btn-tertiary:hover:not(:disabled),
body.dark-mode .btn-tertiary:hover:not(:disabled) {
  background-color: #4A4A4A;
  color: #E0E0E0;
}

html.dark-mode .btn-icon,
body.dark-mode .btn-icon {
  background: rgba(255, 255, 255, 0.15);
  color: white;
}

html.dark-mode .btn-icon:hover,
body.dark-mode .btn-icon:hover {
  background-color: rgba(255, 255, 255, 0.25);
}

/* Dark mode contrast fixes for secondary text */
html.dark-mode .stat-label,
body.dark-mode .stat-label {
  color: #E0E0E0 !important;
}

html.dark-mode .progress-text,
body.dark-mode .progress-text {
  color: #E0E0E0 !important;
}

html.dark-mode .progress-section h2,
body.dark-mode .progress-section h2 {
  color: #E0E0E0 !important;
}

html.dark-mode .category-name,
body.dark-mode .category-name {
  color: #E0E0E0 !important;
}

html.dark-mode .category-details,
body.dark-mode .category-details {
  color: #E0E0E0 !important;
}

html.dark-mode .result-message,
body.dark-mode .result-message {
  color: #E0E0E0 !important;
}

html.dark-mode .category-result span:last-child,
body.dark-mode .category-result span:last-child {
  color: #E0E0E0 !important;
}

html.dark-mode .settings-section.info-section p,
body.dark-mode .settings-section.info-section p {
  color: #E0E0E0 !important;
}

/* ============================================
   ACHIEVEMENTS SECTION
   ============================================ */

.achievements-section {
  background: linear-gradient(135deg, #fff5e1 0%, #fff9f0 100%);
  border-radius: 12px;
  padding: 20px;
  margin-top: 30px;
  box-shadow: 0 2px 8px rgba(255, 152, 0, 0.1);
}

.achievements-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.achievements-header h3 {
  margin: 0;
  color: #333;
  font-size: 1.3em;
}

.achievement-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: bold;
  color: #666;
}

.progress-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.mini-progress-bar {
  width: 120px;
  height: 6px;
  background: #e0e0e0;
  border-radius: 3px;
  overflow: hidden;
}

.mini-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #FF6B6B, #FFA500, #4CAF50);
  transition: width 0.5s ease;
}

.achievements-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.achievement-badge {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 10px;
  border-left: 4px solid #999;
  transition: all 0.3s ease;
}

.achievement-badge.earned {
  background: rgba(255, 255, 255, 0.95);
  border-left-color: #FFB300;
  box-shadow: 0 2px 6px rgba(255, 179, 0, 0.2);
}

.achievement-icon {
  font-size: 2em;
  flex-shrink: 0;
}

.achievement-info {
  flex-grow: 1;
}

.achievement-name {
  font-weight: bold;
  color: #333;
  margin-bottom: 4px;
}

.achievement-description {
  font-size: 0.85em;
  color: #666;
  line-height: 1.4;
}

.no-achievements {
  text-align: center;
  color: #999;
  padding: 20px;
  font-style: italic;
}

/* Achievement Notification */
.achievement-notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  animation: slideIn 0.5s ease;
}

.achievement-notification-content {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  text-align: center;
  max-width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}

.achievement-notification-content h3 {
  margin: 0 0 20px 0;
  color: #FFB300;
  font-size: 1.5em;
}

.achievement-unlocked {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  background: #f5f5f5;
  border-radius: 10px;
  margin-bottom: 15px;
}

.achievement-unlocked:last-child {
  margin-bottom: 0;
}

.achievement-icon-large {
  font-size: 3em;
  flex-shrink: 0;
}

.achievement-details {
  text-align: left;
}

.achievement-details .achievement-name {
  font-size: 1.1em;
}

.achievement-notification.fade-out {
  animation: slideOut 0.5s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translate(-50%, -60%);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes slideOut {
  from {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
  to {
    opacity: 0;
    transform: translate(-50%, -60%);
  }
}

/* Dark mode for achievements */
html.dark-mode .achievements-section,
body.dark-mode .achievements-section {
  background: linear-gradient(135deg, #2c2416 0%, #32291e 100%);
}

html.dark-mode .achievements-header h3,
body.dark-mode .achievements-header h3 {
  color: #E0E0E0;
}

html.dark-mode .achievement-progress,
body.dark-mode .achievement-progress {
  color: #B0B0B0;
}

html.dark-mode .achievement-name,
body.dark-mode .achievement-name {
  color: #E0E0E0;
}

html.dark-mode .achievement-description,
body.dark-mode .achievement-description {
  color: #B0B0B0;
}

html.dark-mode .achievement-badge,
body.dark-mode .achievement-badge {
  background: rgba(50, 50, 50, 0.7);
}

html.dark-mode .achievement-badge.earned,
body.dark-mode .achievement-badge.earned {
  background: rgba(60, 60, 60, 0.95);
}

html.dark-mode .no-achievements,
body.dark-mode .no-achievements {
  color: #999;
}

/* Responsive achievements */
@media (max-width: 768px) {
  .achievements-section {
    padding: 15px;
    margin-top: 20px;
  }

  .achievements-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .achievement-badge {
    flex-direction: column;
    text-align: center;
    gap: 10px;
  }

  .achievement-info {
    width: 100%;
  }

  .achievement-details {
    text-align: center;
  }
}

/* ============================================
   DETAILED STATISTICS SCREEN
   ============================================ */

.stats-screen {
  overflow-y: auto;
}

.stats-main {
  padding: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #e0e0e0;
  font-size: 0.95em;
}

.stat-row:last-child {
  border-bottom: none;
}

.stat-row span:first-child {
  color: #666;
  font-weight: 500;
}

.stat-row span:last-child {
  color: #333;
  font-weight: 600;
}

.detailed-category-item {
  margin-bottom: 20px;
  padding: 15px;
  background: #f9f9f9;
  border-radius: 8px;
}

.category-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
}

.category-score {
  color: #4CAF50;
  font-size: 1.1em;
}

.category-bar {
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.category-fill {
  height: 100%;
  background: linear-gradient(90deg, #1565C0, #42A5F5);
  transition: width 0.5s ease;
}

.category-detail {
  font-size: 0.85em;
  color: #999;
}

.milestone-message {
  margin-top: 15px;
  padding: 12px;
  background: #e3f2fd;
  border-left: 4px solid #1565C0;
  color: #0d47a1;
  border-radius: 4px;
  font-style: italic;
}

.journey-message {
  margin-top: 15px;
  padding: 12px;
  background: #fff3e0;
  border-left: 4px solid #FF9800;
  color: #e65100;
  border-radius: 4px;
  font-style: italic;
}

/* Dark mode stats */
html.dark-mode .stat-row,
body.dark-mode .stat-row {
  border-bottom-color: #444;
}

html.dark-mode .stat-row span:first-child,
body.dark-mode .stat-row span:first-child {
  color: #B0B0B0;
}

html.dark-mode .stat-row span:last-child,
body.dark-mode .stat-row span:last-child {
  color: #E0E0E0;
}

html.dark-mode .detailed-category-item,
body.dark-mode .detailed-category-item {
  background: #2a2a2a;
}

html.dark-mode .category-header,
body.dark-mode .category-header {
  color: #E0E0E0;
}

html.dark-mode .category-detail,
body.dark-mode .category-detail {
  color: #999;
}

html.dark-mode .category-bar,
body.dark-mode .category-bar {
  background: #444;
}

html.dark-mode .milestone-message,
body.dark-mode .milestone-message {
  background: #1a237e;
  color: #90caf9;
  border-left-color: #42a5f5;
}

html.dark-mode .journey-message,
body.dark-mode .journey-message {
  background: #e6550044;
  color: #ffb74d;
  border-left-color: #ffa726;
}

/* Responsive stats */
@media (max-width: 768px) {
  .stats-main {
    padding: 15px;
  }

  .stat-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }

  .detailed-category-item {
    padding: 12px;
    margin-bottom: 15px;
  }
}