/* CSS Variables for consistent theming */
:root {
  --bg: #0b0f14;
  --card: #121823;
  --muted: #76839a;
  --text: #e6efff;
  --accent: #6aa6ff;
  --accent-2: #78f0b8;
  --danger: #ff6b6b;
  --warn: #ffd166;
  --success: #78f0b8;
  --border: #1f2633;
  --border-light: #2c3a52;
  --shadow: rgba(0, 0, 0, 0.35);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Border radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;
  
  /* Transitions */
  --transition: 0.2s ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-modal: 2000;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
}

*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, var(--bg) 0%, #0e141d 100%);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* Focus styles for accessibility */
*:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Focus info section */
#focusInfo {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

#focusInfo p {
  margin: 0;
  line-height: 1.4;
}

#availableFocusAreas {
  font-family: monospace;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--accent);
  color: #041225;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: var(--z-dropdown);
}

.skip-link:focus {
  top: 6px;
}

/* Layout */
.wrap {
  max-width: 980px;
  margin: var(--spacing-lg) auto;
  padding: var(--spacing-md);
}

/* Header */
header {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

h1 {
  font-size: clamp(20px, 3vw, 28px);
  margin: 0;
  font-weight: 700;
  line-height: 1.2;
}

/* Controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
}

/* Buttons */
button {
  background: var(--accent);
  border: none;
  color: #041225;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  line-height: 1;
  min-height: 44px; /* Accessibility: minimum touch target size */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  user-select: none;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(106, 166, 255, 0.3);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

button:disabled:hover {
  transform: none;
  box-shadow: none;
}

button.secondary {
  background: #1e2a3d;
  color: var(--text);
  border: 1px solid var(--border-light);
}

button.secondary:hover {
  background: #2a3a4d;
  border-color: var(--accent);
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text);
}

button.ghost:hover {
  background: rgba(106, 166, 255, 0.1);
  border-color: var(--accent);
}

button.warn {
  background: var(--warn);
  color: #222;
}

button.warn:hover {
  background: #ffdb4d;
}

button.danger {
  background: var(--danger);
  color: #fff;
}

button.danger:hover {
  background: #ff5252;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: 0 15px 40px var(--shadow);
}

/* Grid and rows */
.row {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  align-items: center;
}

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

/* Meta text */
.meta {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

/* Pills */
.pill {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  background: #0f1520;
  color: var(--text);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Progress bar */
.progress {
  height: 10px;
  background: #0c1220;
  border: 1px solid #1a2235;
  border-radius: var(--radius-full);
  overflow: hidden;
  transition: var(--transition);
}

.progress > div {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #9ad0ff);
  width: 0%;
  transition: width 0.3s ease;
}

/* Question styles */
.q {
  padding: var(--spacing-lg);
}

.q h3 {
  margin: 0 0 var(--spacing-sm);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

/* Question metadata badges */
.question-meta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
  align-items: center;
}

.difficulty-badge,
.focus-badge,
.category-badge,
.multiple-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.difficulty-badge.easy {
  background: rgba(120, 240, 184, 0.2);
  color: var(--success);
  border: 1px solid rgba(120, 240, 184, 0.3);
}

.difficulty-badge.medium {
  background: rgba(255, 209, 102, 0.2);
  color: var(--warn);
  border: 1px solid rgba(255, 209, 102, 0.3);
}

.difficulty-badge.hard {
  background: rgba(255, 107, 107, 0.2);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.3);
}

.focus-badge {
  background: rgba(106, 166, 255, 0.2);
  color: var(--accent);
  border: 1px solid rgba(106, 166, 255, 0.3);
}

.category-badge {
  background: rgba(118, 131, 154, 0.2);
  color: var(--muted);
  border: 1px solid rgba(118, 131, 154, 0.3);
}

.multiple-badge {
  background: rgba(255, 107, 107, 0.2);
  color: var(--danger);
  border: 1px solid rgba(255, 107, 107, 0.3);
}

/* Choices */
.choices {
  display: grid;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.choice {
  border: 1px solid #293247;
  background: #101827;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-start;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.choice:hover {
  background: #1a2330;
  border-color: var(--accent);
  transform: translateX(2px);
}

.choice.selected {
  border-color: var(--accent);
  background: rgba(106, 166, 255, 0.1);
}

.choice input[type="radio"],
.choice input[type="checkbox"] {
  margin-top: 3px;
  cursor: pointer;
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.choice input[type="radio"]:focus + span,
.choice input[type="checkbox"]:focus + span {
  color: var(--accent);
}

.choice span {
  flex: 1;
  line-height: 1.4;
  cursor: pointer;
  user-select: none;
}

/* Choice states */
.choice.correct {
  border-color: rgba(120, 240, 184, 0.7);
  background: rgba(20, 48, 38, 0.35);
}

.choice.wrong {
  border-color: rgba(255, 107, 107, 0.7);
  background: rgba(57, 18, 18, 0.35);
}

/* Explanation */
.explain {
  margin-top: var(--spacing-sm);
  color: #a9b6cc;
  font-size: 14px;
  line-height: 1.5;
  padding: var(--spacing-sm);
  background: rgba(169, 182, 204, 0.1);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

/* Footer */
.footer {
  padding: var(--spacing-md);
  border-top: 1px solid #1c2435;
  background: #0f1626;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  justify-content: space-between;
}

/* Summary */
.summary {
  padding: var(--spacing-lg);
}

.summary h2 {
  margin: 0 0 var(--spacing-md);
  color: var(--text);
  font-size: 24px;
  font-weight: 600;
}

/* Score display */
.score {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  margin: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

/* Scoring info */
.scoring-info {
  border-left: 4px solid var(--accent);
}

.scoring-info ul {
  color: var(--text-muted);
}

.scoring-info li {
  margin: 4px 0;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-weight: bold;
  position: relative;
}

.score-circle.pass {
  background: linear-gradient(135deg, var(--success), #4ade80);
  color: #041225;
}

.score-circle.fail {
  background: linear-gradient(135deg, var(--danger), #ef4444);
  color: #fff;
}

.score-circle .percentage {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
}

.score-circle .label {
  font-size: 14px;
  margin-top: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.score-details {
  flex: 1;
  min-width: 200px;
}

.score-details p {
  margin: var(--spacing-xs) 0;
  font-size: 16px;
}

.score-details strong {
  color: var(--accent);
}

/* Review questions */
.review-question {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.review-question.correct {
  border-color: var(--success);
  background: rgba(120, 240, 184, 0.1);
}

.review-question.incorrect {
  border-color: var(--danger);
  background: rgba(255, 107, 107, 0.1);
}

.review-question h3 {
  margin: 0 0 var(--spacing-sm);
  color: var(--text);
  font-size: 18px;
}

.review-question p {
  margin: var(--spacing-xs) 0;
  line-height: 1.5;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* Points badge */
.points-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.points-badge.earned {
  background: var(--success);
  color: #041225;
}

.points-badge.missed {
  background: var(--danger);
  color: #fff;
}

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

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

/* Responsive design */
@media (max-width: 768px) {
  .wrap {
    margin: var(--spacing-md) auto;
    padding: var(--spacing-sm);
  }
  
  header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }
  
  .controls {
    justify-content: center;
  }
  
  .row {
    flex-direction: column;
    align-items: stretch;
  }
  
  .score {
    flex-direction: column;
    text-align: center;
  }
  
  .score-circle {
    width: 100px;
    height: 100px;
  }
  
  .score-circle .percentage {
    font-size: 24px;
  }
  
  .footer {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }
  
  .q {
    padding: var(--spacing-md);
  }
  
  .summary {
    padding: var(--spacing-md);
  }
  
  .question-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .wrap {
    margin: var(--spacing-sm) auto;
    padding: var(--spacing-xs);
  }
  
  h1 {
    font-size: 20px;
    text-align: center;
  }
  
  .card {
    border-radius: var(--radius-md);
  }
  
  button {
    padding: 12px 16px;
    font-size: 16px;
    width: 100%;
  }
  
  .choices {
    gap: var(--spacing-xs);
  }
  
  .choice {
    padding: var(--spacing-sm);
  }
  
  .difficulty-badge,
  .focus-badge,
  .category-badge,
  .multiple-badge {
    font-size: 11px;
    padding: var(--spacing-xs);
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #ffffff;
    --border-light: #ffffff;
    --text: #ffffff;
    --bg: #000000;
    --card: #1a1a1a;
  }
  
  button {
    border: 2px solid var(--border);
  }
  
  .choice {
    border: 2px solid var(--border);
  }
}

/* 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;
  }
  
  button:hover {
    transform: none;
  }
  
  .choice:hover {
    transform: none;
  }
}

/* Print styles */
@media print {
  .controls,
  .footer,
  button {
    display: none !important;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #000;
  }
  
  body {
    background: white;
    color: black;
  }
}

.error-boundary {
    background-color: #fee;
    color: #c33;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid #fcc;
    border-radius: 4px;
    display: none;
}

.success-message {
    background-color: #efe;
    color: #363;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid #cfc;
    border-radius: 4px;
    display: block;
}