:root {
  --bg: #0b1020;
  --panel: rgba(17, 24, 39, 0.82);
  --panel-2: rgba(30, 41, 59, 0.72);
  --line: rgba(148, 163, 184, 0.18);
  --text: #e5eefb;
  --muted: #95a6c6;
  --accent: #6ee7f9;
  --accent-2: #8b5cf6;
  --good: #22c55e;
  --warn: #eab308;
  --bad: #ef4444;
  --gold: #f59e0b;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(110, 231, 249, 0.14), transparent 28%),
    radial-gradient(circle at top right, rgba(139, 92, 246, 0.15), transparent 24%),
    linear-gradient(180deg, #09111f, #11182a 44%, #0f172a);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* Header */
.site-header {
  padding: 20px 0;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.site-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
}

.site-header h1 a {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-header p {
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 4px;
}

/* Subject Cards Grid */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.subject-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.subject-card:hover {
  transform: translateY(-2px);
  border-color: rgba(110, 231, 249, 0.35);
}

.subject-card.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.subject-card.disabled:hover {
  transform: none;
  border-color: var(--line);
}

.subject-card h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.subject-card .subtitle {
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 12px;
}

.subject-card .stats {
  display: flex;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--muted);
}

.stat-badge {
  padding: 3px 8px;
  border-radius: 8px;
  background: rgba(148, 163, 184, 0.1);
}

.stat-badge.official {
  background: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

/* Config View */
.config-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}

.config-section h2 {
  font-size: 1.3rem;
  margin-bottom: 24px;
}

.config-group {
  margin-bottom: 20px;
}

.config-group label {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.config-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.7);
  color: var(--text);
  appearance: auto;
}

.source-buttons {
  display: flex;
  gap: 8px;
}

.source-btn {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.source-btn.active {
  background: rgba(110, 231, 249, 0.16);
  color: var(--text);
  border-color: rgba(110, 231, 249, 0.35);
}

.source-btn:hover {
  background: rgba(110, 231, 249, 0.1);
}

/* Buttons */
.btn-primary {
  display: inline-block;
  padding: 14px 24px;
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #07111f;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  display: inline-block;
  padding: 12px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(148, 163, 184, 0.1);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.btn-secondary:hover { transform: translateY(-1px); }

/* Quiz Questions */
.question-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 14px;
}

.question-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.question-number {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--muted);
}

.badge {
  padding: 3px 10px;
  border-radius: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-official {
  background: rgba(245, 158, 11, 0.18);
  color: #fcd34d;
}

.badge-generated {
  background: rgba(148, 163, 184, 0.12);
  color: var(--muted);
}

.question-text-fr {
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.question-text-en {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 16px;
}

.choices-list {
  display: grid;
  gap: 8px;
}

.choice-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.choice-item:hover {
  border-color: rgba(110, 231, 249, 0.3);
  background: rgba(110, 231, 249, 0.04);
}

.choice-item.selected {
  border-color: rgba(110, 231, 249, 0.5);
  background: rgba(110, 231, 249, 0.08);
}

.choice-item input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--accent);
}

.choice-content {
  flex: 1;
}

.choice-fr {
  font-size: 0.92rem;
}

.choice-en {
  font-size: 0.8rem;
  color: var(--muted);
}

/* Results */
.score-display {
  text-align: center;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 18px;
}

.score-value {
  font-size: 3rem;
  font-weight: 800;
}

.score-value.good { color: var(--good); }
.score-value.warn { color: var(--warn); }
.score-value.bad { color: var(--bad); }

.score-label {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

.result-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 12px;
}

.result-block.correct {
  border-color: rgba(34, 197, 94, 0.3);
}

.result-block.wrong {
  border-color: rgba(239, 68, 68, 0.3);
}

.result-indicator {
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.result-indicator.correct { color: var(--good); }
.result-indicator.wrong { color: var(--bad); }

.result-choice {
  padding: 8px 12px;
  border-radius: 10px;
  margin-bottom: 6px;
  font-size: 0.88rem;
}

.result-choice.user-correct {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.result-choice.user-wrong {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.result-choice.correct-answer {
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.25);
}

.explanation {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.explanation-fr {
  font-size: 0.9rem;
  color: var(--text);
}

.explanation-en {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 4px;
}

.results-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

/* Loading & Error */
.loading, .error-msg {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

.error-msg {
  color: var(--bad);
}

.error-msg button {
  margin-top: 12px;
}

/* Utilities */
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }

/* Responsive */
@media (max-width: 520px) {
  .subjects-grid {
    grid-template-columns: 1fr;
  }

  .source-buttons {
    flex-wrap: wrap;
  }

  .score-value {
    font-size: 2.4rem;
  }

  .results-actions {
    flex-direction: column;
  }

  .results-actions button {
    width: 100%;
  }
}