:root {
  --bg: #0f1220;
  --panel: #181c2e;
  --panel2: #1f2440;
  --line: #2b3157;
  --text: #eef1ff;
  --muted: #aab0d4;
  --accent: #5b8cff;
  --accent2: #00c2a8;
  --danger: #ff5d6c;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  background: radial-gradient(1200px 700px at 70% -10%, #1c2146 0, transparent 60%), var(--bg);
  background-color: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}
header { text-align: center; padding: 26px 16px 8px; }
header h1 { margin: 0; font-size: 1.9rem; letter-spacing: .3px; }
header .tag { margin: 6px 0 0; color: var(--muted); }
footer { text-align: center; color: var(--muted); padding: 22px; font-size: .85rem;
  padding-bottom: calc(22px + env(safe-area-inset-bottom)); }

main { max-width: 1120px; margin: 0 auto;
  padding: 14px max(16px, env(safe-area-inset-left)) 30px max(16px, env(safe-area-inset-right)); }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: 0 18px 50px rgba(0,0,0,.35); }
.hidden { display: none !important; }

h2 { margin: 0 0 6px; font-size: 1.2rem; display: flex; align-items: center; gap: 10px; }
h2 .num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; font-size: .95rem; font-weight: 700; }
h3 { margin: 0 0 4px; font-size: 1.05rem; }
.help { color: var(--muted); font-size: .9rem; margin: 0 0 14px; line-height: 1.45; }

/* ---------- Étape 1 ---------- */
#step1 .palette { justify-content: center; }
.preview-solo { max-width: 640px; margin: 0 auto; }
.preview-solo .viewport { height: clamp(300px, 56vh, 480px); }

.palette { display: flex; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.swatch { position: relative; width: 44px; height: 44px; border-radius: 10px; border: 2px solid rgba(255,255,255,.15);
  cursor: pointer; transition: transform .08s, box-shadow .12s; -webkit-appearance: none; appearance: none; padding: 0; }
.swatch:hover { transform: translateY(-2px); }
.swatch.sel { border-color: #fff; box-shadow: 0 0 0 3px var(--accent); transform: translateY(-2px); }
.swatch-count { position: absolute; bottom: -7px; right: -7px; min-width: 18px; height: 18px; padding: 0 3px;
  display: grid; place-items: center; font-size: .72rem; font-weight: 700; border-radius: 9px;
  background: var(--danger); color: #fff; border: 1.5px solid var(--panel); font-variant-numeric: tabular-nums; }
.swatch.count-ok .swatch-count { background: var(--accent2); }

/* Zone d'action en entonnoir : utilitaires (ligne 1) → Vérifier → Résoudre (CTA) */
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
.actions .btn { width: 100%; }
.actions .util { font-size: .9rem; padding: 10px 12px; color: var(--muted); }
.actions #btn-scan { grid-column: 1 / -1; }
.actions #btn-check { grid-column: 1 / -1; }
.actions #btn-solve { grid-column: 1 / -1; font-size: 1.08rem; padding: 14px;
  box-shadow: 0 8px 24px rgba(91,140,255,.28); }
.error { background: rgba(255,93,108,.15); border: 1px solid var(--danger); color: #ffd0d5;
  padding: 10px 12px; border-radius: 10px; margin-top: 14px; font-size: .9rem; }
.error.ok { background: rgba(0,194,168,.15); border-color: var(--accent2); color: #b6ffef; }

.btn { background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  padding: 11px 18px; border-radius: 10px; cursor: pointer; font-size: .95rem; font-weight: 600;
  min-height: 44px; -webkit-appearance: none; appearance: none; touch-action: manipulation;
  transition: transform .08s, filter .12s, background .12s; }
.btn:hover:not(:disabled) { transform: translateY(-1px); filter: brightness(1.12); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); border: none; color: #fff; }
.btn.ghost { background: transparent; }
.btn:disabled.primary { position: relative; }
@keyframes spin { to { transform: rotate(360deg); } }
#btn-solve:disabled::after {
  content: ''; display: inline-block; width: 13px; height: 13px; margin-left: 9px; vertical-align: -2px;
  border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite;
}

/* ---------- Vue 3D ---------- */
.viewport-host { width: 100%; }
.viewport { position: relative; width: 100%; height: 360px; border-radius: 12px; cursor: pointer;
  background: radial-gradient(600px 400px at 50% 20%, #20264a 0, #11142a 70%);
  border: 1px solid var(--line); touch-action: none; }

/* Bouton flottant « recentrer la vue » posé dans le coin de la vue 3D */
.recenter-btn { position: absolute; top: 10px; right: 10px; z-index: 5;
  width: 42px; height: 42px; display: grid; place-items: center; padding: 0;
  font-size: 1.3rem; line-height: 1; color: var(--text); cursor: pointer;
  border-radius: 11px; border: 1px solid var(--line);
  background: rgba(24,28,46,.72); backdrop-filter: blur(6px);
  -webkit-appearance: none; appearance: none; touch-action: manipulation;
  transition: transform .12s, filter .12s, background .12s; }
.recenter-btn:hover { filter: brightness(1.25); background: rgba(31,36,64,.85); }
.recenter-btn:active { transform: scale(.92) rotate(-30deg); }

/* ---------- Étape 2 ---------- */
.solve-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 24px; align-items: start; margin-top: 8px; }
@media (max-width: 860px) { .solve-grid { grid-template-columns: 1fr; } }
.solve-3d .viewport { height: clamp(280px, 50vh, 440px); }

/* Barre de progression de la résolution */
.progress { height: 6px; border-radius: 999px; background: var(--panel2); border: 1px solid var(--line);
  overflow: hidden; margin: 12px 0 2px; }
.progress-bar { height: 100%; width: 0; border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .25s ease; }

.move-display { text-align: center; margin: 14px 0 6px; }
.badge { display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  font-size: 2.1rem; font-weight: 800; letter-spacing: 1px;
  background: var(--panel2); border: 1px solid var(--line); border-radius: 12px; padding: 6px 22px; min-width: 90px; }
.badge .b-move { font-variant-numeric: tabular-nums; }
.badge .b-dir { font-size: 1.5rem; font-weight: 600; color: var(--accent2); }
.hint { color: var(--text); margin-top: 10px; font-size: 1.05rem; min-height: 1.4em; }

.nav { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 10px; }
.nav .btn { min-width: 130px; }
.counter { color: var(--muted); min-width: 110px; text-align: center; font-variant-numeric: tabular-nums; }
.nav2 { display: flex; justify-content: center; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
#btn-play.playing { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border-color: transparent; }

.solve-side { background: var(--panel2); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.movelist { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 14px; max-height: 320px; overflow: auto; }
.mv { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px;
  font-weight: 700; font-family: ui-monospace, monospace; cursor: pointer;
  transition: background .1s, transform .06s, opacity .1s; }
.mv:hover { transform: translateY(-1px); filter: brightness(1.2); }
.mv.done { opacity: .42; }                                   /* mouvements déjà effectués */
.mv.next { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }  /* prochain */
.mv.active { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff;
  border-color: transparent; box-shadow: none; opacity: 1; transform: translateY(-1px); }
.legend { color: var(--muted); font-size: .82rem; line-height: 1.5; border-top: 1px solid var(--line); padding-top: 10px; }
.legend code { background: var(--panel); padding: 1px 5px; border-radius: 5px; }

/* ---------- Adaptations mobile / tablette ---------- */
@media (max-width: 680px) {
  /* En-tête réduit à l'essentiel : titre compact, sous-titre superflu masqué */
  header { padding: 10px 14px 2px; }
  header h1 { font-size: 1.25rem; }
  header .tag { display: none; }
  /* Pendant la résolution, le cube prime : on masque l'en-tête entièrement */
  body.solving header { display: none; }
  main { padding: 8px max(12px, env(safe-area-inset-left)) 24px max(12px, env(safe-area-inset-right)); }
  .panel { padding: 16px 14px; border-radius: 16px; }
  h2 { font-size: 1.1rem; }
  .help { font-size: .86rem; }

  /* Palette accessible : reste collée en haut pendant la peinture */
  #step1 .palette { position: sticky; top: 0; z-index: 20; justify-content: center;
    gap: 10px; margin: -16px -14px 14px; padding: 12px 10px;
    background: rgba(24,28,46,.92); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line); border-radius: 16px 16px 0 0; }
  .swatch { width: 46px; height: 46px; }

  /* Boutons d'action (l'entonnoir est défini en base) : marge resserrée */
  .actions { margin-top: 14px; }

  /* Étape 2 : le cube + le mouvement courant + Précédent/Suivant tiennent ensemble
     dans le premier écran ; la « Solution complète » est secondaire, sous le pli. */
  .solve-grid { gap: 14px; }
  .solve-3d .viewport { height: clamp(230px, 40vh, 440px); }
  .progress { margin: 10px 0 2px; }
  .move-display { margin: 10px 0 4px; }
  .nav { gap: 10px; margin-top: 8px; }
  .nav .btn { min-width: 0; flex: 1; padding: 14px 10px; }
  .counter { min-width: 0; flex: 0 0 auto; font-size: .85rem; }
  .nav2 { gap: 8px; margin-top: 12px; }
  .nav2 .btn { flex: 1; min-width: 0; font-size: .85rem; padding: 10px 8px; }

  .badge { font-size: 1.7rem; padding: 5px 18px; }
  .hint { font-size: .96rem; margin-top: 8px; min-height: 0; }
  .solve-side h3 { font-size: 1rem; }
  .movelist { max-height: 132px; }
  .mv { padding: 9px 12px; }      /* cibles tactiles plus grandes */
  footer { font-size: .78rem; padding: 16px; }
}

@media (max-width: 380px) {
  .palette { gap: 8px; }
  .swatch { width: 42px; height: 42px; }
  .badge { font-size: 1.5rem; }
}

/* ---------- Scanner (appareil photo) ---------- */
.scanner { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: rgba(8, 10, 20, .82); backdrop-filter: blur(6px);
  padding: max(12px, env(safe-area-inset-top)) 12px max(12px, env(safe-area-inset-bottom)); }
.scanner-card { width: 100%; max-width: 460px; max-height: 100%; overflow: auto;
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  padding: 16px; box-shadow: 0 24px 70px rgba(0,0,0,.55); }
.scanner-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.scanner-head h2 { font-size: 1.15rem; }
.scan-close { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--panel2); color: var(--text); font-size: 1.1rem; cursor: pointer; flex: 0 0 auto;
  -webkit-appearance: none; appearance: none; }
.scan-close:hover { filter: brightness(1.2); }
.scan-instr { color: var(--text); font-size: .95rem; line-height: 1.45; margin: 8px 0 12px; }

.scan-stage { position: relative; width: 100%; aspect-ratio: 1; border-radius: 14px;
  overflow: hidden; background: #000; border: 1px solid var(--line); }
.scan-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.scan-grid { position: absolute; top: 15%; left: 15%; width: 70%; height: 70%;
  display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr);
  gap: 0; pointer-events: none; }
.scan-cell { border: 2px solid rgba(255,255,255,.85); position: relative;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.45); display: grid; place-items: center; }
.scan-dot { width: 38%; height: 38%; border-radius: 6px; background: transparent;
  border: 1.5px solid rgba(0,0,0,.45); box-shadow: 0 1px 3px rgba(0,0,0,.4); }

.scan-faces { display: flex; justify-content: center; gap: 8px; margin: 14px 0 6px; flex-wrap: wrap; }
.scan-face-chip { width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel2); color: var(--muted);
  font-weight: 800; font-size: .95rem; -webkit-appearance: none; appearance: none;
  transition: transform .08s, box-shadow .12s; }
.scan-face-chip:hover { transform: translateY(-1px); }
.scan-face-chip.done { border-color: transparent; box-shadow: 0 2px 8px rgba(0,0,0,.35); }
.scan-face-chip.current { box-shadow: 0 0 0 3px var(--accent); }
.scan-status { color: var(--muted); font-size: .85rem; text-align: center; margin: 4px 0 12px; min-height: 1.2em; }

.scan-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.scan-actions .btn { width: 100%; }
.scan-actions .scan-capture { grid-column: 1 / -1; font-size: 1.02rem; padding: 13px; }

@media (max-width: 380px) {
  .scan-face-chip { width: 36px; height: 36px; }
}

/* Respecte la préférence « réduire les animations » */
@media (prefers-reduced-motion: reduce) {
  .btn, .swatch, .mv, .progress-bar { transition: none; }
}