/* ==============================
   QCM VISSERIE AÉRONAUTIQUE
   Thème : atelier technique / aviation industrielle
   ============================== */

:root {
  --bleu-acier: #1a2b4a;
  --bleu-ciel: #2563eb;
  --bleu-clair: #3b82f6;
  --orange-safran: #f97316;
  --jaune-warning: #fbbf24;
  --vert-ok: #22c55e;
  --rouge-ko: #ef4444;
  --gris-fond: #0f1c2e;
  --gris-carte: #1e2f47;
  --gris-bord: #2d4060;
  --texte: #e8edf5;
  --texte-dim: #8ca0be;
  --blanc: #ffffff;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--gris-fond);
  color: var(--texte);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── HEADER ── */
.header {
  width: 100%;
  background: linear-gradient(135deg, #0d1b35 0%, #1a2b4a 50%, #0d1b35 100%);
  border-bottom: 2px solid var(--orange-safran);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.header-icon { font-size: 28px; }

.header-title {
  flex: 1;
}

.header-title h1 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--blanc);
  text-transform: uppercase;
}

.header-title p {
  font-size: 0.72rem;
  color: var(--orange-safran);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.header-badge {
  background: var(--orange-safran);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: none;
}

/* ── SCREENS ── */
.screen {
  display: none;
  width: 100%;
  max-width: 820px;
  padding: 28px 20px 48px;
  animation: fadeIn 0.3s ease;
}

.screen.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── ACCUEIL ── */
.welcome-hero {
  text-align: center;
  padding: 24px 0 32px;
}

.welcome-hero .big-icon { font-size: 72px; line-height: 1; margin-bottom: 12px; }

.welcome-hero h2 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--blanc);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.welcome-hero .subtitle {
  color: var(--orange-safran);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.stats-bar {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.stat-chip {
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-radius: 8px;
  padding: 10px 18px;
  text-align: center;
}

.stat-chip .num {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--bleu-clair);
}

.stat-chip .lbl {
  font-size: 0.7rem;
  color: var(--texte-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── FORM PRÉNOM ── */
.form-section {
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.form-section label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--texte-dim);
  margin-bottom: 8px;
}

.form-section input[type="text"] {
  width: 100%;
  background: var(--bleu-acier);
  border: 1.5px solid var(--gris-bord);
  border-radius: 8px;
  color: var(--blanc);
  font-size: 1rem;
  padding: 12px 16px;
  outline: none;
  transition: border-color 0.2s;
}

.form-section input[type="text"]:focus {
  border-color: var(--bleu-clair);
}

/* ── MODE CARDS ── */
.mode-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--texte-dim);
  margin-bottom: 12px;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.mode-card {
  background: var(--gris-carte);
  border: 2px solid var(--gris-bord);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--gris-bord);
  transition: background 0.2s;
}

.mode-card:hover,
.mode-card.selected {
  border-color: var(--bleu-clair);
  background: #1e3358;
}

.mode-card.selected::before {
  background: var(--orange-safran);
}

.mode-card .mode-icon { font-size: 1.4rem; margin-bottom: 6px; }
.mode-card .mode-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--blanc);
  margin-bottom: 3px;
}
.mode-card .mode-desc { font-size: 0.72rem; color: var(--texte-dim); }

/* ── THEME SELECTOR ── */
.theme-selector {
  display: none;
  margin-bottom: 20px;
}
.theme-selector.visible { display: block; }

.theme-selector select {
  width: 100%;
  background: var(--bleu-acier);
  border: 1.5px solid var(--gris-bord);
  border-radius: 8px;
  color: var(--blanc);
  font-size: 0.9rem;
  padding: 10px 14px;
  outline: none;
  cursor: pointer;
}

/* ── BOUTON PRINCIPAL ── */
.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--orange-safran), #ea6500);
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 16px rgba(249,115,22,0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(249,115,22,0.5);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--gris-carte);
  border: 1.5px solid var(--gris-bord);
  border-radius: var(--radius);
  color: var(--texte);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 20px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--bleu-clair);
  color: var(--blanc);
}

/* ── QUIZ SCREEN ── */
.quiz-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}

.quiz-meta .cat-tag {
  background: rgba(37,99,235,0.25);
  border: 1px solid rgba(59,130,246,0.4);
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  color: var(--bleu-clair);
}

.quiz-meta .q-counter {
  font-size: 0.78rem;
  color: var(--texte-dim);
  font-weight: 600;
}

.timer-display {
  font-size: 0.78rem;
  color: var(--orange-safran);
  font-weight: 700;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--gris-bord);
  border-radius: 2px;
  margin-bottom: 20px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--bleu-clair), var(--orange-safran));
  border-radius: 2px;
  transition: width 0.4s ease;
}

.question-card {
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.multi-badge {
  display: inline-block;
  background: rgba(251,191,36,0.15);
  border: 1px solid var(--jaune-warning);
  color: var(--jaune-warning);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 10px;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--blanc);
  margin-bottom: 16px;
}

.question-img {
  width: 100%;
  max-width: 360px;
  border-radius: 8px;
  border: 1.5px solid var(--gris-bord);
  margin: 0 auto 16px;
  display: block;
  background: #000;
}

/* ── OPTIONS ── */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  width: 100%;
  background: var(--bleu-acier);
  border: 1.5px solid var(--gris-bord);
  border-radius: 8px;
  color: var(--texte);
  font-size: 0.92rem;
  text-align: left;
  padding: 13px 16px;
  cursor: pointer;
  transition: all 0.18s;
  display: flex;
  align-items: center;
  gap: 12px;
  line-height: 1.4;
}

.option-btn:hover:not(:disabled) {
  border-color: var(--bleu-clair);
  background: #1e3358;
}

.option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--gris-bord);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--texte-dim);
  transition: all 0.18s;
  flex-shrink: 0;
}

.option-btn:hover:not(:disabled) .option-letter {
  border-color: var(--bleu-clair);
  color: var(--bleu-clair);
}

/* Checkbox style for multi */
.option-check {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1.5px solid var(--gris-bord);
  background: transparent;
  transition: all 0.18s;
  flex-shrink: 0;
  font-size: 0.7rem;
  color: transparent;
}

.option-btn.checked .option-check {
  background: var(--bleu-clair);
  border-color: var(--bleu-clair);
  color: #fff;
}

/* States after answer */
.option-btn.correct {
  background: rgba(34,197,94,0.15);
  border-color: var(--vert-ok);
  color: var(--blanc);
}
.option-btn.correct .option-letter,
.option-btn.correct .option-check {
  background: var(--vert-ok);
  border-color: var(--vert-ok);
  color: #fff;
}

.option-btn.wrong {
  background: rgba(239,68,68,0.12);
  border-color: var(--rouge-ko);
  color: #e8a0a0;
}
.option-btn.wrong .option-letter,
.option-btn.wrong .option-check {
  background: var(--rouge-ko);
  border-color: var(--rouge-ko);
  color: #fff;
}

.option-btn.missed {
  background: rgba(34,197,94,0.08);
  border-color: rgba(34,197,94,0.4);
}

.option-btn:disabled { cursor: default; }

/* ── VALIDATION BUTTON (multi) ── */
.btn-validate {
  width: 100%;
  background: var(--bleu-acier);
  border: 1.5px solid var(--bleu-clair);
  border-radius: 8px;
  color: var(--bleu-clair);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 13px;
  cursor: pointer;
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: all 0.18s;
}

.btn-validate:hover {
  background: var(--bleu-clair);
  color: #fff;
}

/* ── EXPLICATION ── */
.explain-box {
  background: rgba(37,99,235,0.1);
  border-left: 3px solid var(--bleu-clair);
  border-radius: 0 8px 8px 0;
  padding: 14px 16px;
  margin-top: 16px;
  font-size: 0.88rem;
  color: var(--texte);
  line-height: 1.55;
  display: none;
  animation: fadeIn 0.3s ease;
}

.explain-box.correct-explain { border-color: var(--vert-ok); }
.explain-box.wrong-explain   { border-color: var(--rouge-ko); }
.explain-box .explain-head {
  font-weight: 700;
  margin-bottom: 4px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn-next {
  width: 100%;
  background: linear-gradient(135deg, var(--bleu-ciel), var(--bleu-clair));
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 0.92rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 14px;
  cursor: pointer;
  margin-top: 12px;
  display: none;
  transition: all 0.18s;
}

.btn-next:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.4);
}

/* ── RÉSULTATS ── */
.results-hero {
  text-align: center;
  padding: 28px 0 24px;
}

.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 5px solid var(--gris-bord);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  position: relative;
  background: var(--gris-carte);
}

.score-circle.excellent { border-color: var(--vert-ok); }
.score-circle.good      { border-color: var(--bleu-clair); }
.score-circle.medium    { border-color: var(--jaune-warning); }
.score-circle.low       { border-color: var(--rouge-ko); }

.score-pct {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--blanc);
}

.score-label {
  font-size: 0.7rem;
  color: var(--texte-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.result-verdict {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--blanc);
}

.result-detail {
  color: var(--texte-dim);
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.result-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.r-stat {
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-radius: 8px;
  padding: 10px 18px;
  text-align: center;
  min-width: 90px;
}

.r-stat .r-num {
  font-size: 1.3rem;
  font-weight: 800;
}

.r-stat .r-lbl {
  font-size: 0.65rem;
  color: var(--texte-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.r-stat.ok .r-num  { color: var(--vert-ok); }
.r-stat.ko .r-num  { color: var(--rouge-ko); }
.r-stat.time .r-num { color: var(--orange-safran); }

/* ── ERREURS LIST ── */
.errors-section {
  margin-bottom: 24px;
}

.errors-section h3 {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--texte-dim);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.error-item {
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-left: 3px solid var(--rouge-ko);
  border-radius: 0 8px 8px 0;
  padding: 12px 14px;
  margin-bottom: 8px;
  font-size: 0.84rem;
}

.error-item .eq { color: var(--blanc); margin-bottom: 4px; font-weight: 600; }
.error-item .ea { color: var(--rouge-ko); font-size: 0.78rem; }
.error-item .ec { color: var(--vert-ok); font-size: 0.78rem; }

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── CLASSEMENT ── */
.leaderboard-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--texte-dim);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.lb-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--gris-carte);
  border: 1px solid var(--gris-bord);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 6px;
  font-size: 0.85rem;
}

.lb-rank {
  min-width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  background: var(--gris-bord);
  color: var(--texte-dim);
  flex-shrink: 0;
}

.lb-rank.gold   { background: #f59e0b; color: #000; }
.lb-rank.silver { background: #94a3b8; color: #000; }
.lb-rank.bronze { background: #b45309; color: #fff; }

.lb-name { flex: 1; font-weight: 600; color: var(--blanc); }
.lb-mode { font-size: 0.68rem; color: var(--texte-dim); }
.lb-score { font-weight: 800; color: var(--bleu-clair); min-width: 48px; text-align: right; }
.lb-time  { font-size: 0.72rem; color: var(--texte-dim); min-width: 50px; text-align: right; }

.lb-empty {
  text-align: center;
  color: var(--texte-dim);
  font-style: italic;
  padding: 20px;
  font-size: 0.85rem;
}

.lb-loading {
  text-align: center;
  color: var(--texte-dim);
  padding: 20px;
  font-size: 0.85rem;
}

/* ── SKELETON / LOADING ── */
@keyframes pulse {
  0%,100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

.loading-dots::after {
  content: '';
  animation: dots 1.5s infinite;
}

@keyframes dots {
  0%  { content: '.'; }
  33% { content: '..'; }
  66% { content: '...'; }
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .mode-grid { grid-template-columns: 1fr; }
  .stats-bar { gap: 12px; }
  .welcome-hero h2 { font-size: 1.4rem; }
  .score-circle { width: 120px; height: 120px; }
  .score-pct { font-size: 2rem; }
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gris-fond); }
::-webkit-scrollbar-thumb { background: var(--gris-bord); border-radius: 3px; }