/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Nunito', 'Segoe UI', system-ui, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0.8rem 1.5rem;
  background: #16213e;
  border-bottom: 2px solid #0f3460;
}

header h1 {
  font-size: 1.3rem;
  color: #e0e0e0;
  white-space: nowrap;
}

#mode-tabs {
  display: flex;
  gap: 0.5rem;
}

.tab-btn {
  padding: 0.4rem 1.2rem;
  border: 2px solid #0f3460;
  background: transparent;
  color: #aaa;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.tab-btn:hover {
  border-color: #e2b96f;
  color: #e2b96f;
}

.tab-btn.active {
  background: #e2b96f;
  border-color: #e2b96f;
  color: #1a1a2e;
  font-weight: 600;
}

/* ===== LAYOUT PRINCIPAL ===== */
main {
  display: flex;
  flex: 1;
  min-height: 0;          /* essentiel pour que flex enfants ne débordent pas */
  gap: 1.2rem;
  padding: 1rem 1.2rem;
  align-items: stretch;
  overflow: hidden;
}

/* ===== SECTION ÉCHIQUIER ===== */
#board-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

#board-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

#board-row {
  display: flex;
  align-items: center;
  gap: 2px;
}

/* Coordonnées */
.coords {
  display: flex;
  color: #888;
  font-size: 0.7rem;
  font-weight: 600;
  user-select: none;
}

.coords-h {
  flex-direction: row;
  width: 448px;
  margin-left: 20px;
}

.coords-h span {
  flex: 1;
  text-align: center;
}

.coords-v {
  flex-direction: column;
  width: 18px;
}

.coords-v span {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Échiquier */
#board {
  display: grid;
  grid-template-columns: repeat(8, 56px);
  grid-template-rows: repeat(8, 56px);
  border: 2px solid #0f3460;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.square {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  cursor: pointer;
  position: relative;
  transition: background 0.15s;
  user-select: none;
}

.square.light { background: #f0d9b5; }
.square.dark  { background: #b58863; }

/* 11.1 Hover sur les cases (mode exercice uniquement) */
#board.interactive-mode .square:hover {
  filter: brightness(1.12);
}

/* Highlights */
.square.highlight-last {
  background: rgba(255, 214, 0, 0.5) !important;
}

.square.highlight-selected {
  background: rgba(0, 180, 255, 0.55) !important;
}

.square.highlight-legal::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.22);
  pointer-events: none;
  z-index: 1;
}

/* Case occupée par une pièce adverse : ring au lieu du point */
.square.highlight-legal.occupied::after {
  width: 90%;
  height: 90%;
  border-radius: 50%;
  background: transparent;
  border: 4px solid rgba(0, 0, 0, 0.22);
}

.square.highlight-correct {
  background: rgba(60, 200, 80, 0.55) !important;
}

.square.highlight-wrong {
  background: rgba(220, 50, 50, 0.55) !important;
}

/* Pièce */
.piece {
  line-height: 1;
  transition: transform 0.15s;
  pointer-events: none;
}

/* Pièces blanches : remplissage blanc, contour noir */
.piece.piece-w {
  color: #fff;
  text-shadow:
    0 0 2px #000,
    0 0 3px #000,
     1px  1px 0 #000,
    -1px  1px 0 #000,
     1px -1px 0 #000,
    -1px -1px 0 #000;
}

/* Pièces noires : remplissage noir, contour blanc pour les cases foncées */
.piece.piece-b {
  color: #1a1a1a;
  text-shadow:
    0 0 2px rgba(255,255,255,0.8),
     1px  1px 0 rgba(255,255,255,0.6),
    -1px  1px 0 rgba(255,255,255,0.6),
     1px -1px 0 rgba(255,255,255,0.6),
    -1px -1px 0 rgba(255,255,255,0.6);
}

/* ===== CONTRÔLES SOUS L'ÉCHIQUIER ===== */
#board-controls {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

/* 9.1 Indicateur de couleur jouée */
.player-indicator {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  user-select: none;
  letter-spacing: 0.02em;
}

.player-indicator.player-white {
  background: #f0d9b5;
  color: #1a1a2e;
  border: 2px solid #b58863;
}

.player-indicator.player-black {
  background: #2a2a2a;
  color: #f0d9b5;
  border: 2px solid #555;
}

/* ===== PANNEAU LATÉRAL ===== */
#panel {
  flex: 1;
  max-width: 360px;
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow: hidden;
}

.panel-mode {
  background: #16213e;
  border-radius: 10px;
  padding: 0.7rem 1rem;
  border: 1px solid #0f3460;
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
  overflow: hidden;
}

.panel-mode h2 {
  font-size: 0.95rem;
  color: #e2b96f;
  margin-bottom: 0.5rem;
  flex-shrink: 0;
}

.panel-mode h3 {
  font-size: 0.92rem;
  color: #e2b96f;
  margin-bottom: 0.3rem;
  flex-shrink: 0;
}

/* Catégories d'ouvertures — accordéon */
#opening-categories {
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  flex-shrink: 0;
  scrollbar-width: thin;
  scrollbar-color: #0f3460 transparent;
}

#opening-categories::-webkit-scrollbar { width: 4px; }
#opening-categories::-webkit-scrollbar-thumb { background: #0f3460; border-radius: 2px; }

.opening-category {
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.opening-category:last-child { border-bottom: none; }

/* En-tête cliquable de catégorie */
.opening-category h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: #888;
  letter-spacing: 0.06em;
  cursor: pointer;
  padding: 0.45rem 0.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: color 0.15s;
}

.opening-category h4:hover { color: #bbb; }

/* Flèche accordéon */
.opening-category h4::after {
  content: '▸';
  font-size: 0.65rem;
  color: #555;
  transition: transform 0.2s ease;
}

.opening-category.open h4::after {
  transform: rotate(90deg);
  color: #e2b96f;
}

/* Liste cachée par défaut */
.opening-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease-out, padding-bottom 0.25s;
  padding-bottom: 0;
}

/* Liste dépliée */
.opening-category.open .opening-list {
  max-height: 280px;
  padding-bottom: 0.4rem;
}

.opening-btn {
  background: #0f3460;
  border: 1px solid #1a4a80;
  color: #ccc;
  border-radius: 5px;
  padding: 0.4rem 0.7rem;
  text-align: left;
  cursor: pointer;
  font-size: 0.88rem;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.opening-btn:hover {
  background: #1a4a80;
  color: #fff;
}

.opening-btn.active {
  background: #e2b96f;
  color: #1a1a2e;
  font-weight: 600;
  border-color: #e2b96f;
}

.opening-btn .badge-done {
  margin-left: auto;
  color: #4caf50;
  font-size: 0.85rem;
}

/* Infos cours — zone scrollable quand le contenu déborde */
#cours-info {
  margin-top: 0.5rem;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  scrollbar-width: thin;
  scrollbar-color: #0f3460 transparent;
}

#cours-info p {
  font-size: 0.82rem;
  color: #aaa;
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

#cours-progress {
  font-size: 0.78rem;
  color: #888;
  margin-bottom: 0.35rem;
}

.comment-box {
  background: #0d1b2a;
  border-left: 3px solid #e2b96f;
  padding: 0.5rem 0.7rem;
  font-size: 0.85rem;
  color: #ccc;
  border-radius: 0 6px 6px 0;
  min-height: 2rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

#cours-controls {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
  flex-wrap: wrap;
}

/* Exercice */
#exercice-setup label {
  display: block;
  font-size: 0.88rem;
  color: #aaa;
  margin-bottom: 0.25rem;
}

#exo-opening-select {
  width: 100%;
  padding: 0.35rem 0.5rem;
  background: #0f3460;
  border: 1px solid #1a4a80;
  color: #e0e0e0;
  border-radius: 5px;
  font-size: 0.88rem;
  margin-bottom: 0.5rem;
}

#exo-submode {
  border: 1px solid #0f3460;
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  margin-bottom: 0.5rem;
}

#exo-submode legend {
  font-size: 0.8rem;
  color: #888;
  padding: 0 0.4rem;
}

#exo-submode label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: #ccc;
  margin-bottom: 0.25rem;
}

#exo-turn-indicator {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  padding: 0.25rem 0.5rem;
  border-radius: 5px;
  display: inline-block;
}

.turn-white { background: #f0d9b5; color: #1a1a2e; }
.turn-black { background: #333; color: #f0d9b5; border: 1px solid #555; }

.feedback-box {
  min-height: 1.6rem;
  padding: 0.3rem 0.7rem;
  border-radius: 5px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  transition: all 0.2s;
}

.feedback-correct { background: rgba(60,200,80,0.2); color: #4caf50; border: 1px solid #4caf50; }
.feedback-wrong   { background: rgba(220,50,50,0.2);  color: #f44336; border: 1px solid #f44336; }
.feedback-info    { background: rgba(33,150,243,0.15); color: #64b5f6; border: 1px solid #64b5f6; }

#exo-progress {
  display: flex;
  gap: 1rem;
  font-size: 0.78rem;
  color: #888;
  margin-bottom: 0.4rem;
}

/* Grille des boutons d'exercice */
#exercice-play .exo-btn-row {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.4rem;
}

#btn-hint {
  background: rgba(33,150,243,0.15);
  border-color: #1976d2;
  color: #64b5f6;
}

#btn-hint:hover { background: rgba(33,150,243,0.3); }

#btn-solution {
  background: rgba(255,152,0,0.12);
  border-color: #f57c00;
  color: #ffb74d;
}

#btn-solution:hover { background: rgba(255,152,0,0.25); }

#btn-reset-exo, #btn-back-setup {
  font-size: 0.82rem;
}

/* ===== SCORE SESSION ===== */
#session-score {
  background: #16213e;
  border-radius: 8px;
  padding: 0.3rem 0.8rem;
  border: 1px solid #0f3460;
  font-size: 0.8rem;
  color: #666;
  text-align: center;
  flex-shrink: 0;
}

/* ===== HISTORIQUE DES COUPS ===== */
#moves-history {
  background: #16213e;
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  border: 1px solid #0f3460;
  flex-shrink: 0;
}

#moves-history h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: #666;
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
}

#moves-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.4rem;
  font-size: 0.82rem;
  color: #ccc;
  max-height: 48px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #0f3460 transparent;
}

#moves-list::-webkit-scrollbar { width: 3px; }
#moves-list::-webkit-scrollbar-thumb { background: #0f3460; border-radius: 2px; }

.move-pair {
  white-space: nowrap;
  color: #aaa;
}

.move-pair .move-num {
  color: #666;
}

.move-pair .move-san {
  color: #ccc;
}

.move-pair .move-san.current {
  color: #e2b96f;
  font-weight: 600;
}

/* (score-session déplacé au-dessus de l'historique) */

/* ===== BOUTONS GÉNÉRAUX ===== */
button {
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  border: 1px solid #0f3460;
  background: #0f3460;
  color: #ccc;
  cursor: pointer;
  font-size: 0.88rem;
  transition: all 0.15s;
}

button:hover {
  background: #1a4a80;
  color: #fff;
  border-color: #1a4a80;
}

button:active {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
}

#btn-practice, #btn-start-exo {
  background: #e2b96f;
  border-color: #e2b96f;
  color: #1a1a2e;
  font-weight: 600;
  width: 100%;
  margin-top: 0.4rem;
}

#btn-practice:hover, #btn-start-exo:hover {
  background: #f0ca88;
  border-color: #f0ca88;
  color: #1a1a2e;
}

/* ===== UTILITAIRES ===== */
.hidden { display: none !important; }

/* ===== RESPONSIVE ===== */
@media (max-width: 860px) {
  body { height: auto; overflow: auto; }

  main {
    flex-direction: column;
    align-items: center;
    overflow: auto;
    padding: 0.8rem 1rem;
  }

  #panel {
    max-width: 100%;
    width: 100%;
    overflow: visible;
    min-height: unset;
  }

  .panel-mode { flex: unset; overflow: visible; }
  #cours-info  { overflow: visible; flex: unset; }

  .coords-h { width: 448px; }
}

@media (max-width: 520px) {
  #board {
    grid-template-columns: repeat(8, 44px);
    grid-template-rows: repeat(8, 44px);
  }

  .square { width: 44px; height: 44px; font-size: 1.8rem; }
  .coords-h { width: 352px; }
  .coords-v span { height: 44px; }
}

/* ── Collection : identité + retour hub + accessibilité ── */
header h1 { font-family: 'Nunito', sans-serif; font-weight: 800; }
.cred-atger { text-align:center; font-size:.8rem; font-weight:600; opacity:.7; margin:4px 0 0; color:#cdd8e6; }
.cred-atger a { color:#e2b96f; text-decoration:none; }
.cred-atger a:hover { text-decoration:underline; }
.back-hub { position:fixed; top:12px; left:12px; z-index:9999; display:inline-flex; align-items:center; gap:5px; background:rgba(15,20,30,.72); border:1px solid rgba(255,255,255,.18); color:#cdd8e6; text-decoration:none; font-size:.8rem; font-weight:700; padding:7px 14px; border-radius:50px; opacity:.9; transition:opacity .2s, transform .2s; backdrop-filter:blur(4px); font-family:'Nunito',sans-serif; }
.back-hub:hover { opacity:1; transform:translateX(-2px); }
:where(button,a,[tabindex],input,select,textarea):focus-visible { outline:3px solid #e2b96f; outline-offset:2px; border-radius:6px; }
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; } }