/* ===== BASE ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --orange: #ff7f2a;
  --jaune: #ffd84d;
  --violet: #7c3aed;
  --vert: #22c55e;
  --rouge: #ef4444;
  --bleu: #3b82f6;
  --fond: #fffbf0;
  --texte: #1e1b4b;
  --rayon: 18px;
}

body {
  font-family: 'Nunito', 'Segoe UI', Arial, sans-serif;
  background: var(--fond);
  color: var(--texte);
  font-size: 20px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== HEADER ===== */
.site-header {
  background: linear-gradient(135deg, #7c3aed, #3b82f6);
  color: white;
  text-align: center;
  padding: 24px 20px 20px;
  position: relative;
}

.site-header .emoji-header { font-size: 3rem; display: block; margin-bottom: 6px; }
.site-header h1 { font-size: 2rem; font-weight: 900; letter-spacing: -0.5px; }
.site-header p { font-size: 1rem; opacity: 0.9; margin-top: 4px; }

/* ===== NAV ===== */
.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.4);
  color: white;
  border-radius: 30px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  margin-top: 14px;
  transition: background 0.2s;
}
.nav-back:hover { background: rgba(255,255,255,0.35); }

/* ===== MAIN ===== */
main { max-width: 720px; margin: 0 auto; padding: 30px 20px 60px; }

/* ===== CARDS ACCUEIL ===== */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 10px;
}

.card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: white;
  border-radius: var(--rayon);
  padding: 22px 24px;
  text-decoration: none;
  color: var(--texte);
  box-shadow: 0 4px 0 #0001, 0 2px 12px #0001;
  border: 3px solid transparent;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  cursor: pointer;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 0 #0001, 0 4px 20px #0002;
}
.card.bleu   { border-color: #bfdbfe; }
.card.vert   { border-color: #bbf7d0; }
.card.orange { border-color: #fed7aa; }
.card.violet { border-color: #ddd6fe; }

.card .icon {
  font-size: 2.8rem;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.card.bleu   .icon { background: #eff6ff; }
.card.vert   .icon { background: #f0fdf4; }
.card.orange .icon { background: #fff7ed; }
.card.violet .icon { background: #f5f3ff; }

.card .card-body { flex: 1; }
.card .card-body h2 { font-size: 1.15rem; font-weight: 800; margin-bottom: 3px; }
.card .card-body p  { font-size: 0.88rem; color: #666; }
.card .stars { font-size: 1rem; margin-top: 5px; }

.card .arrow {
  font-size: 1.6rem;
  opacity: 0.35;
  transition: opacity 0.15s, transform 0.15s;
}
.card:hover .arrow { opacity: 1; transform: translateX(4px); }

/* ===== BADGE NIVEAU ===== */
.badge-niveau {
  display: inline-block;
  background: linear-gradient(135deg, #7c3aed, #3b82f6);
  color: white;
  border-radius: 20px;
  padding: 6px 18px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 24px;
}

/* ===== SECTION FICHE ===== */
.retiens-box {
  background: linear-gradient(135deg, #fef9c3, #fef3c7);
  border-radius: var(--rayon);
  border: 3px solid #f59e0b;
  padding: 22px 24px;
  margin-bottom: 28px;
  box-shadow: 0 2px 0 #f59e0b33;
}
.retiens-box .retiens-title {
  font-size: 1rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #92400e;
  margin-bottom: 12px;
}
.retiens-box .fraction-cards {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.frac-pill {
  background: var(--fond);
  border: 2px solid var(--jaune);
  border-radius: 12px;
  padding: 10px 18px;
  text-align: center;
  flex: 1;
  min-width: 90px;
}
.frac-pill .sym { font-size: 2rem; font-weight: 900; color: var(--violet); }
.frac-pill .nom { font-size: 0.8rem; color: #555; margin-top: 2px; }
.f { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 2px; line-height: 1.1; }
.fn { border-bottom: 2.5px solid currentColor; padding: 0 4px 2px; text-align: center; min-width: 0.8em; }
.fd { padding: 2px 4px 0; text-align: center; min-width: 0.8em; }

/* ===== EXERCICE ===== */
.exercice-block {
  background: white;
  border-radius: var(--rayon);
  padding: 24px;
  margin-bottom: 22px;
  box-shadow: 0 2px 12px #0001;
  border: 2px solid #f0f0f0;
}
.exercice-block .ex-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px dashed #e5e7eb;
  display: flex;
  align-items: center;
  gap: 10px;
}
.ex-badge {
  background: var(--violet);
  color: white;
  border-radius: 8px;
  padding: 2px 12px;
  font-size: 0.82rem;
  font-weight: 700;
}

/* Grille figures colorier */
.figures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 14px;
  margin: 10px 0;
}
.figure-card {
  background: #f8f7ff;
  border: 2px solid #ede9fe;
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}
.figure-card .frac-big { font-size: 1.5rem; font-weight: 900; color: var(--violet); margin-bottom: 8px; }
.squares-row { display: flex; flex-wrap: wrap; gap: 5px; justify-content: center; margin: 8px 0; }
.sq {
  width: 34px; height: 34px;
  border: 2px solid var(--violet);
  border-radius: 6px;
  background: white;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  user-select: none;
}
.sq:hover { background: #ede9fe; transform: scale(1.08); }
.sq.filled { background: var(--violet); }
.sq.filled:hover { background: #5b21b6; }
.sq.correct { background: var(--vert); border-color: #16a34a; }
.sq.wrong   { background: var(--rouge); border-color: #b91c1c; }
.figure-feedback {
  font-size: 0.82rem;
  font-weight: 800;
  margin-top: 8px;
  min-height: 18px;
  transition: color 0.2s;
}
.figure-card .hint { font-size: 0.75rem; color: #888; }

/* Questions liste */
.q-list { list-style: none; }
.q-list li {
  background: #f8f7ff;
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
  border: 2px solid #ede9fe;
  font-size: 0.95rem;
}
.line { display: inline-block; border-bottom: 2px dashed #c4b5fd; min-width: 70px; }

/* VF boutons */
.vf-item {
  background: #f8f7ff;
  border-radius: 12px;
  padding: 14px 18px;
  margin-bottom: 10px;
  border: 2px solid #ede9fe;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.93rem;
}
.vf-btns { display: flex; gap: 8px; }
.btn-v, .btn-f {
  border-radius: 20px;
  padding: 5px 16px;
  font-weight: 800;
  font-size: 0.85rem;
  border: 2px solid;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn-v { border-color: var(--vert); color: var(--vert); background: white; }
.btn-f { border-color: var(--rouge); color: var(--rouge); background: white; }
.btn-v:hover { background: var(--vert); color: white; }
.btn-f:hover { background: var(--rouge); color: white; }
.btn-v.active { background: var(--vert); color: white; }
.btn-f.active { background: var(--rouge); color: white; }

/* Calcul grille */
.calcul-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.calcul-item {
  background: #fff7ed;
  border: 2px solid #fed7aa;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.calcul-item .num-badge {
  background: var(--orange);
  color: white;
  border-radius: 8px;
  padding: 2px 8px;
  font-size: 0.8rem;
  font-weight: 800;
}
.input-rep {
  border: none;
  border-bottom: 2px dashed #fb923c;
  background: transparent;
  width: 40px;
  text-align: center;
  font-size: 1rem;
  font-weight: 800;
  color: var(--texte);
  outline: none;
}

/* Problème */
.probleme-box {
  background: #fffbf0;
  border: 3px solid var(--jaune);
  border-radius: 14px;
  padding: 20px 22px;
}
.probleme-box .pb-enonce {
  font-style: italic;
  color: #555;
  margin-bottom: 14px;
  font-size: 0.95rem;
  line-height: 1.7;
}
.pb-q { margin-bottom: 10px; font-size: 0.95rem; }

/* ===== DROITE GRADUÉE ===== */
.droite-vis {
  background: #f0fdf4;
  border: 2px dashed var(--vert);
  border-radius: 12px;
  padding: 20px 24px 10px;
  margin: 14px 0;
}
.droite-vis .labels { display: flex; justify-content: space-between; font-weight: 800; color: var(--vert); font-size: 1rem; }
.droite-vis .ligne { height: 4px; background: var(--vert); border-radius: 2px; margin: 8px 0; }
.droite-eleve .zone { height: 40px; border-bottom: 3px solid var(--vert); margin: 10px 0; position: relative; }

/* Comparer grid */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.compare-item {
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
}
.compare-item .rep-circle {
  width: 42px; height: 42px;
  border: 2px dashed var(--vert);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.sign-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sign-item {
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 1rem;
  font-weight: 700;
  display: flex; align-items: center; gap: 8px;
}
.sign-box {
  width: 38px; height: 34px;
  border: 2px dashed var(--vert);
  border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
}

/* ===== FOOTER ===== */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.85rem;
  color: #aaa;
  border-top: 2px dashed #e5e7eb;
  margin-top: 40px;
}
.site-footer a { color: var(--violet); text-decoration: none; font-weight: 700; }

/* Responsive */
@media (max-width: 500px) {
  .calcul-grid, .compare-grid, .sign-grid { grid-template-columns: 1fr; }
  .figures-grid { grid-template-columns: repeat(2, 1fr); }
  body { font-size: 17px; }
}

/* ================================================================
   DESIGN ENRICHI — Inspiré Duolingo
   ================================================================ */

/* ── Animations ────────────────────────────────────────────── */
@keyframes _popIn  { from { opacity:0; transform:scale(0.88) translateY(8px); } to { opacity:1; transform:scale(1) translateY(0); } }
@keyframes _bounce { 0%,100% { transform:scale(1); } 45% { transform:scale(1.14); } }
@keyframes _shake  { 0%,100% { transform:translateX(0); } 20%,60% { transform:translateX(-8px); } 40%,80% { transform:translateX(8px); } }
@keyframes _xpFly  { to { opacity:0; transform:translateY(-50px) scale(1.35); } }

/* ── XP Float ──────────────────────────────────────────────── */
._xpf {
  position: fixed;
  font-size: 1rem;
  font-weight: 900;
  color: #16a34a;
  pointer-events: none;
  z-index: 9999;
  animation: _xpFly 0.95s ease forwards;
}

/* ── q-block amélioré ──────────────────────────────────────── */
.q-block {
  background: white;
  border: 2.5px solid #e5e7eb;
  border-radius: 16px;
  padding: 16px 18px;
  margin-bottom: 14px;
  box-shadow: 0 4px 0 #e5e7eb;
  animation: _popIn 0.3s ease both;
  position: relative;
}
.q-block:last-child { margin-bottom: 0; }

/* ── Boutons QCM ── version Duolingo ───────────────────────── */
.btn-choice {
  background: white;
  border: 2.5px solid #e5e7eb;
  border-radius: 14px;
  padding: 11px 24px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  color: #374151;
  transition: all 0.12s;
  box-shadow: 0 4px 0 #d1d5db;
  font-family: inherit;
}
.btn-choice:hover:not([disabled]) {
  border-color: #7c3aed;
  color: #7c3aed;
  background: #f5f3ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #c4b5fd;
}
.btn-choice:active:not([disabled]) { transform: translateY(2px); box-shadow: 0 2px 0 #d1d5db; }
.btn-choice.correct {
  background: #16a34a; border-color: #15803d; color: white;
  box-shadow: 0 4px 0 #166534;
  animation: _bounce 0.35s ease;
}
.btn-choice.wrong {
  background: #ef4444; border-color: #dc2626; color: white;
  box-shadow: 0 4px 0 #b91c1c;
  animation: _shake 0.4s ease;
}
.btn-choice:disabled { opacity: 0.65; cursor: default; transform: none; box-shadow: none; }

/* Vrai / Faux styles spéciaux */
.btn-vrai { background:#dcfce7 !important; border-color:#22c55e !important; color:#166534 !important;
            box-shadow: 0 4px 0 #bbf7d0 !important; font-size:1.05rem !important; }
.btn-faux { background:#fee2e2 !important; border-color:#ef4444 !important; color:#991b1b !important;
            box-shadow: 0 4px 0 #fecaca !important; font-size:1.05rem !important; }
.btn-vrai:hover:not([disabled]) { background:#bbf7d0 !important; transform:translateY(-2px); }
.btn-faux:hover:not([disabled]) { background:#fecaca !important; transform:translateY(-2px); }

/* ── Feedback ───────────────────────────────────────────────── */
.feedback-line {
  font-size: 0.95rem;
  font-weight: 800;
  margin-top: 10px;
  min-height: 24px;
  border-radius: 10px;
  padding: 0;
  transition: all 0.2s;
}
.fb-ok { color: #166534; background: #dcfce7; padding: 6px 12px; }
.fb-ko { color: #991b1b; background: #fee2e2; padding: 6px 12px; }
.fb-warn { color: #92400e; background: #fef3c7; padding: 6px 12px; }

/* ── Carte affichage (ex-card) ─────────────────────────────── */
.ex-card {
  font-size: 2.2rem;
  font-weight: 900;
  text-align: center;
  padding: 14px 20px;
  border-radius: 16px;
  margin-bottom: 14px;
  letter-spacing: 1px;
  line-height: 1.3;
}
.ex-hint { font-size:0.82rem; color:#6b7280; margin-bottom:8px; font-style:italic; }

/* ── Exercice block amélioré ──────────────────────────────── */
.exercice-block {
  background: white;
  border-radius: 20px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 6px 0 #e5e7eb, 0 2px 20px #0001;
  border: 2.5px solid #f0f0f0;
  position: relative;
  overflow: hidden;
}
.exercice-block::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 6px;
  background: var(--accent, var(--violet));
  border-radius: 20px 0 0 20px;
}
.exercice-block .ex-title {
  font-size: 1.05rem;
  font-weight: 900;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px dashed #e5e7eb;
  display: flex;
  align-items: center;
  gap: 10px;
}
.ex-badge {
  background: var(--violet);
  color: white;
  border-radius: 10px;
  padding: 3px 14px;
  font-size: 0.82rem;
  font-weight: 900;
  box-shadow: 0 3px 0 #5b21b6;
}
/* Type badges */
.badge-qcm  { background: #7c3aed; }
.badge-vf   { background: #0ea5e9; }
.badge-ordre{ background: #f59e0b; }
.badge-tri  { background: #10b981; }
.badge-paires{background: #ec4899; }

/* ── Retiens box améliorée ────────────────────────────────── */
.retiens-box {
  background: linear-gradient(135deg, #fffbeb, #fef3c7);
  border-radius: 20px;
  border: 3px solid #f59e0b;
  padding: 22px 24px;
  margin-bottom: 28px;
  box-shadow: 0 4px 0 #f59e0b44;
  position: relative;
}
.retiens-box .retiens-title {
  font-size: 1rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #92400e;
  margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
/* Retiens visual cards (inside retiens-box) */
.concept-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.concept-card {
  background: white;
  border: 2px solid #fbbf24;
  border-radius: 14px;
  padding: 12px 10px;
  text-align: center;
  box-shadow: 0 3px 0 #fbbf24;
}
.concept-card .c-big   { font-size: 1.6rem; font-weight: 900; color: #92400e; }
.concept-card .c-label { font-size: 0.72rem; color: #78350f; margin-top: 4px; font-weight: 700; }

/* ── Actions (valider / reset) ────────────────────────────── */
.ex-actions { margin-top: 12px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn-validate {
  background: #7c3aed; color: white; border: none; border-radius: 14px;
  padding: 11px 28px; font-weight: 900; font-size: 0.95rem; cursor: pointer;
  font-family: inherit; box-shadow: 0 4px 0 #5b21b6; transition: all 0.12s;
}
.btn-validate:hover { background: #6d28d9; transform: translateY(-2px); box-shadow: 0 6px 0 #5b21b6; }
.btn-validate:active { transform: translateY(2px); box-shadow: 0 2px 0 #5b21b6; }
.btn-reset {
  background: #9ca3af; color: white; border: none; border-radius: 14px;
  padding: 11px 20px; font-weight: 800; font-size: 0.95rem; cursor: pointer;
  font-family: inherit; box-shadow: 0 4px 0 #6b7280;
}
.btn-reset:hover { background: #6b7280; }

/* ── Exercice ORDRE ───────────────────────────────────────── */
.ordre-pool {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0;
}
.ordre-hint, .tri-hint {
  font-size: 0.78rem; color: #9ca3af; margin-bottom: 6px; font-style: italic;
}
.ordre-item {
  background: white; border: 2.5px solid #d1d5db; border-radius: 12px;
  padding: 9px 18px; font-weight: 800; font-size: 1rem; cursor: pointer;
  transition: all 0.12s; font-family: inherit;
  box-shadow: 0 3px 0 #d1d5db;
}
.ordre-item:hover:not([disabled]):not(.used) {
  border-color: #7c3aed; background: #f5f3ff; color: #7c3aed; transform: translateY(-2px);
}
.ordre-item.used { opacity: 0.25; pointer-events: none; box-shadow: none; }
.ordre-zone {
  display: flex; gap: 8px; flex-wrap: wrap; min-height: 56px;
  border: 2.5px dashed #9ca3af; border-radius: 14px; padding: 8px;
  align-items: center; background: #f9fafb; margin-top: 4px;
}
.ordre-chip {
  background: #ede9fe; border: 2.5px solid #7c3aed; border-radius: 10px;
  padding: 8px 16px; font-weight: 800; cursor: pointer; font-size: 0.95rem;
  font-family: inherit; transition: all 0.12s;
}
.ordre-chip:hover { background: #fce7f3; border-color: #ec4899; }

/* ── Exercice TRI ──────────────────────────────────────────── */
.tri-pool {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0;
}
.tri-chip {
  background: white; border: 2.5px solid #d1d5db; border-radius: 12px;
  padding: 9px 18px; font-weight: 800; cursor: pointer; transition: all 0.12s;
  user-select: none; font-family: inherit; box-shadow: 0 3px 0 #d1d5db;
}
.tri-chip:hover:not(.tri-used) { border-color: #7c3aed; background: #f5f3ff; color: #7c3aed; }
.tri-chip.tri-sel  { box-shadow: 0 0 0 3px #7c3aed55; border-color: #7c3aed; background: #ede9fe; color: #7c3aed; }
.tri-chip.tri-used { opacity: 0.25; pointer-events: none; box-shadow: none; }
.tri-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin-top: 8px;
}
.tri-col {
  background: #f9fafb; border: 2.5px dashed #9ca3af; border-radius: 14px;
  padding: 10px; min-height: 90px; transition: border-color 0.15s, background 0.15s;
  cursor: default;
}
.tri-col.tri-target { border-color: #7c3aed; background: #f5f3ff; cursor: pointer; }
.tri-col-title {
  font-size: 0.82rem; font-weight: 900; text-align: center; margin-bottom: 8px;
  padding: 4px 8px; background: white; border-radius: 8px; border: 1.5px solid #e5e7eb;
}
.tri-col-items { display: flex; flex-wrap: wrap; gap: 6px; min-height: 36px; }
.tri-placed {
  background: white; border: 2px solid #9ca3af; border-radius: 8px;
  padding: 5px 12px; font-weight: 800; font-size: 0.88rem; cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.tri-placed:hover { border-color: #ef4444; background: #fef2f2; }
.tri-placed.ok { border-color: #22c55e; background: #f0fdf4; cursor: default; }
.tri-placed.ko { border-color: #ef4444; background: #fef2f2; cursor: default; }

/* ── Exercice PAIRES ──────────────────────────────────────── */
.paires-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 10px;
}
.paires-col { display: flex; flex-direction: column; gap: 8px; }
.paires-btn {
  background: white; border: 2.5px solid #d1d5db; border-radius: 12px;
  padding: 12px; font-weight: 800; cursor: pointer; text-align: center;
  transition: all 0.12s; font-family: inherit; font-size: 0.95rem; width: 100%;
  box-shadow: 0 3px 0 #d1d5db;
}
.paires-btn:hover:not([disabled]):not(.p-ok) { border-color: #7c3aed; background: #f5f3ff; color: #7c3aed; }
.paires-btn.p-sel { border-color: #7c3aed; background: #ede9fe; color: #7c3aed; box-shadow: 0 0 0 3px #7c3aed33; }
.paires-btn.p-ok  { background: #f0fdf4; border-color: #22c55e; color: #166534; opacity: 0.75; cursor: default; box-shadow: none; }
.paires-btn.p-ko  { border-color: #ef4444; background: #fef2f2; animation: _shake 0.4s ease; }

/* ── Badge niveau ─────────────────────────────────────────── */
.badge-niveau {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #7c3aed, #3b82f6);
  color: white;
  border-radius: 20px;
  padding: 6px 20px;
  font-size: 0.85rem;
  font-weight: 900;
  margin-bottom: 24px;
  box-shadow: 0 3px 0 #5b21b6;
  letter-spacing: 0.5px;
}

/* ── pb-enonce amélioré ───────────────────────────────────── */
.pb-enonce {
  background: linear-gradient(135deg, #fef9c3, #fef3c7);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 12px;
  font-size: 0.93rem;
  color: #78350f;
  line-height: 1.65;
  font-weight: 700;
  border-left: 4px solid #f59e0b;
}

/* ── Header enrichi ────────────────────────────────────────── */
.site-header {
  position: relative;
  overflow: hidden;
}
.site-header::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 28px;
  background: var(--fond);
  border-radius: 28px 28px 0 0;
}

/* ── frac-card améliorée ───────────────────────────────────── */
.frac-card {
  font-size: 2rem;
  font-weight: 900;
  text-align: center;
  padding: 14px;
  border-radius: 16px;
  margin-bottom: 14px;
  box-shadow: 0 4px 0 rgba(0,0,0,0.1);
  letter-spacing: 1px;
}

/* ── Responsive enrichi ───────────────────────────────────── */
@media (max-width: 500px) {
  .paires-wrap { grid-template-columns: 1fr; }
  .tri-grid    { grid-template-columns: 1fr 1fr; }
  .btn-choice  { padding: 10px 16px; font-size: 0.95rem; }
  .ex-card     { font-size: 1.7rem; }
  .frac-card   { font-size: 1.7rem; }
}