:root{
  --ink:#173447;
  --cream:#fff8e8;
  --teal:#1b6f7a;
  --teal2:#2d9ea2;
  --gold:#ffc84b;
  --violet:#7c58d5;
  --shadow:0 10px 24px rgba(38,48,70,.18);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;min-height:100%;font-family:Trebuchet MS,Arial,sans-serif;background:
 radial-gradient(circle at 20% 0%,rgba(255,255,255,.8),transparent 32%),
 linear-gradient(180deg,#c8eef2 0,#e7f7e6 34%,#f8eac1 100%);color:var(--ink)}
body{min-height:100vh;overflow-x:hidden}
.app-shell{width:min(100%,720px);margin:auto;min-height:100vh;padding:calc(env(safe-area-inset-top) + 10px) 4px calc(env(safe-area-inset-bottom) + 20px)}
.topbar{display:flex;align-items:center;justify-content:space-between;background:linear-gradient(180deg,#fffdf5,#f7edc8);border:3px solid #fff;border-radius:22px;padding:10px 12px;box-shadow:var(--shadow);margin-bottom:10px}
.brand{display:flex;align-items:center;gap:10px}.logo-badge{font-size:34px;width:52px;height:52px;display:grid;place-items:center;background:linear-gradient(145deg,#ffe171,#ff9e3d);border-radius:16px;border:3px solid #fff;box-shadow:0 5px 0 #c66f20}
h1{font-size:22px;line-height:1;margin:0;text-transform:uppercase;letter-spacing:.4px}.subtitle{font-size:12px;margin-top:5px;opacity:.72}
.icon-btn{border:0;background:linear-gradient(180deg,#57c4cf,#23838f);color:#fff;width:48px;height:48px;border-radius:15px;font-size:26px;font-weight:bold;box-shadow:0 5px 0 #155b64}
.icon-btn:active{transform:translateY(3px);box-shadow:0 2px 0 #155b64}
.hud{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:10px}.hud-card{background:linear-gradient(180deg,#23485b,#163546);color:#fff;border-radius:16px;padding:8px 7px;text-align:center;border:2px solid rgba(255,255,255,.35);box-shadow:0 6px 14px rgba(23,52,71,.18)}.hud-label{display:block;font-size:10px;text-transform:uppercase;opacity:.72;letter-spacing:.8px}.hud-card strong{font-size:20px;color:#ffe172}
.board-wrap{position:relative;background:linear-gradient(145deg,#7b4e2f,#4f301d);border:5px solid #fff;border-radius:22px;padding:15px;box-shadow:var(--shadow);overflow:visible}.board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-template-rows:repeat(4,minmax(0,1fr));aspect-ratio:3/4;width:100%;height:auto;background:#29190f;border:3px solid #29190f;touch-action:none;user-select:none;overflow:visible;border-radius:12px;align-items:stretch;justify-items:stretch}.tile{position:relative;width:100%;height:100%;min-width:0;min-height:0;overflow:hidden;touch-action:none;cursor:grab;background:#d0d0d0;contain:layout paint size}.tile:active{cursor:grabbing}.tile-inner{position:absolute;inset:0;width:100%;height:100%;background-size:200% 200%;background-repeat:no-repeat;transition:filter .12s ease;transform:none!important}.tile.locked{box-shadow:none}.tile.grouped .tile-inner{filter:saturate(1.08)}
.tile-edge{position:absolute;z-index:3;pointer-events:none;background:rgba(255,255,255,.42);box-shadow:0 0 0 .5px rgba(0,0,0,.18)}.tile-edge.top{left:0;right:0;top:0;height:1px}.tile-edge.right{top:0;bottom:0;right:0;width:1px}.tile-edge.bottom{left:0;right:0;bottom:0;height:1px}.tile-edge.left{top:0;bottom:0;left:0;width:1px}.tile.joined-top .tile-edge.top,.tile.joined-right .tile-edge.right,.tile.joined-bottom .tile-edge.bottom,.tile.joined-left .tile-edge.left{opacity:0}
.tile.snap-bond{z-index:5;animation:snapBond .26s cubic-bezier(.2,.9,.25,1)}@keyframes snapBond{0%{filter:brightness(1)}42%{filter:brightness(1.35)}100%{filter:brightness(1)}}
.join-flash{position:fixed;z-index:95;pointer-events:none;background:rgba(255,231,112,.95);box-shadow:0 0 10px 4px rgba(255,211,67,.8);border-radius:999px;animation:joinFlash .36s ease-out forwards}@keyframes joinFlash{0%{opacity:0;transform:scale(.4)}30%{opacity:1;transform:scale(1.25)}100%{opacity:0;transform:scale(1)}}
.fx-layer{position:absolute;inset:15px;pointer-events:none;border-radius:14px;overflow:hidden}.burst{position:absolute;border-radius:18px;background:radial-gradient(circle,rgba(255,255,255,.95),rgba(255,218,74,.75) 30%,rgba(255,177,47,.2) 55%,transparent 72%);animation:burst .75s ease-out forwards}.spark{position:absolute;font-size:22px;animation:spark .9s ease-out forwards}@keyframes burst{from{transform:scale(.35);opacity:1}to{transform:scale(1.7);opacity:0}}@keyframes spark{from{transform:translate(0,0) scale(.6);opacity:1}to{transform:translate(var(--dx),var(--dy)) scale(1.25);opacity:0}}
.help-card{margin-top:10px;background:rgba(255,253,245,.93);border:3px solid #fff;border-radius:20px;padding:12px 14px;box-shadow:var(--shadow)}.help-title{font-weight:900;font-size:15px;color:var(--violet);text-transform:uppercase;margin-bottom:4px}.help-card p{margin:4px 0;font-size:12px;line-height:1.35}
.toast{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom) + 24px);transform:translate(-50%,20px);background:#1b394a;color:white;padding:10px 16px;border-radius:999px;font-weight:800;opacity:0;pointer-events:none;transition:.2s;box-shadow:var(--shadow);z-index:20;white-space:nowrap}.toast.show{opacity:1;transform:translate(-50%,0)}
.modal{position:fixed;inset:0;background:rgba(13,33,44,.58);display:grid;place-items:center;padding:20px;z-index:40}.modal.hidden{display:none}.modal-card{width:min(100%,360px);background:linear-gradient(180deg,#fffdf2,#f7e8b4);border:4px solid #fff;border-radius:28px;padding:24px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.3)}.trophy{font-size:62px}.modal-card h2{font-size:34px;margin:6px 0;color:#673eb9}.modal-card p{margin:0 0 12px}.final-stats{display:flex;justify-content:center;gap:20px;font-size:20px;margin:16px 0}.primary-btn{border:0;border-radius:16px;padding:13px 22px;background:linear-gradient(180deg,#7fdc60,#3ca83c);color:white;font-weight:900;font-size:18px;box-shadow:0 6px 0 #2c7d2e}
@media (min-width:620px){h1{font-size:28px}.subtitle{font-size:13px}.help-card p{font-size:13px}}

/* V2 - chargement Internet + déplacement tactile continu */
.loading-overlay{position:fixed;inset:0;z-index:100;background:linear-gradient(180deg,rgba(200,238,242,.97),rgba(248,234,193,.98));display:grid;place-items:center;padding:24px}.loading-overlay.hidden{display:none}.loading-card{width:min(88vw,360px);background:linear-gradient(180deg,#fffdf5,#f7edc8);border:4px solid #fff;border-radius:26px;box-shadow:0 20px 50px rgba(23,52,71,.22);padding:22px;text-align:center;font-weight:900;line-height:1.35}.loading-puzzle{font-size:54px;margin-bottom:8px;animation:loadingBob 1s ease-in-out infinite alternate}.loading-dots{display:flex;justify-content:center;gap:7px;margin-top:15px}.loading-dots i{display:block;width:10px;height:10px;border-radius:50%;background:#2d9ea2;animation:loadingDot .8s ease-in-out infinite alternate}.loading-dots i:nth-child(2){animation-delay:.16s}.loading-dots i:nth-child(3){animation-delay:.32s}@keyframes loadingBob{to{transform:translateY(-7px) rotate(4deg)}}@keyframes loadingDot{to{transform:translateY(-8px);opacity:.45}}
body.is-loading{overflow:hidden}
.board{position:relative}.tile-inner{will-change:transform,filter;background-size:200% 200%;transition:filter .12s ease,opacity .12s ease}.tile.drag-origin .tile-inner{opacity:.18;filter:brightness(.75) saturate(.8)}
.drag-ghost{position:fixed;z-index:80;pointer-events:none;overflow:hidden;border:0;box-shadow:0 8px 18px rgba(19,42,55,.22);will-change:transform;transform-origin:center;backface-visibility:hidden;contain:layout paint size}.drag-ghost-inner{position:absolute;inset:0;background-size:200% 200%;background-repeat:no-repeat}
.tile.evaporating{z-index:4;animation:evaporateTile .68s cubic-bezier(.2,.8,.2,1) forwards}@keyframes evaporateTile{0%{transform:scale(1);opacity:1;filter:brightness(1)}55%{transform:scale(1.12);opacity:.92;filter:brightness(1.7) saturate(1.4)}100%{transform:scale(.08) rotate(14deg);opacity:0;filter:brightness(2.1)}}

/* V4 - grille iOS strictement 5x5, aucune variation de taille */
.board,.tile,.tile-inner,.drag-ghost,.drag-ghost-inner{box-sizing:border-box}
.drag-ghost{border-radius:0!important;transform-origin:0 0!important;contain:strict!important}
.drag-ghost-inner{width:100%!important;height:100%!important;transform:none!important}


/* V5 - groupes indivisibles, indice et validation manuelle des images complètes */
.top-actions{display:flex;align-items:center;gap:8px}.hint-btn{background:linear-gradient(180deg,#ffd966,#f1a928);box-shadow:0 5px 0 #b87516;color:#51380a}.hint-btn:active{box-shadow:0 2px 0 #b87516}.hint-btn:disabled{opacity:.45;filter:grayscale(.5);transform:none;box-shadow:0 3px 0 #9c9c9c}
.tile.hint-piece{z-index:8;animation:hintPulse .62s ease-in-out 4}.tile.hint-piece .tile-inner{filter:brightness(1.22) saturate(1.25)}@keyframes hintPulse{0%,100%{box-shadow:inset 0 0 0 0 rgba(255,213,65,0),0 0 0 0 rgba(255,213,65,0)}50%{box-shadow:inset 0 0 0 4px #ffe066,0 0 14px 5px rgba(255,199,47,.88)}}
.tile.blocked-bump{animation:blockedBump .18s ease-out}@keyframes blockedBump{0%{filter:brightness(1)}50%{filter:brightness(1.25)}100%{filter:brightness(1)}}
.completion-overlay{position:fixed;inset:0;z-index:90;display:grid;place-items:center;padding:22px;background:rgba(18,43,54,.52);backdrop-filter:blur(3px)}.completion-overlay.hidden{display:none}.completion-card{appearance:none;border:4px solid #fff;background:linear-gradient(180deg,#fffdf3,#f8e9b6);width:min(86vw,430px);border-radius:28px;padding:16px;box-shadow:0 22px 60px rgba(0,0,0,.35);display:flex;flex-direction:column;align-items:center;gap:10px;cursor:pointer;color:var(--ink);animation:completionArrive .34s cubic-bezier(.2,.9,.25,1)}.completion-card:focus-visible{outline:4px solid #ffe066;outline-offset:4px}.completion-kicker{font-size:20px;font-weight:900;text-transform:uppercase;color:#6844bd}.completion-card img{display:block;width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:20px;border:4px solid #fff;box-shadow:0 9px 22px rgba(20,50,60,.22)}.completion-tap{font-weight:900;font-size:14px;color:#315463}.completion-card.evaporate{animation:previewEvaporate .52s ease-in forwards}@keyframes completionArrive{from{opacity:0;transform:scale(.72)}to{opacity:1;transform:scale(1)}}@keyframes previewEvaporate{0%{opacity:1;transform:scale(1);filter:brightness(1)}55%{opacity:.95;transform:scale(1.06);filter:brightness(1.55)}100%{opacity:0;transform:scale(.15) rotate(8deg);filter:brightness(2)}}
body.preview-open{overflow:hidden}.preview-open .board{pointer-events:none}.preview-open #hintBtn,.preview-open #restartBtn{pointer-events:none;opacity:.55}

/* V7 - plateau portrait : images sources normalisees en 4:5, morceaux 4:5 */
.board{aspect-ratio:3/4!important;}
.tile,.tile-inner{transform:none!important;}

/* V8 - proportions de la capture de reference : chaque piece est au ratio 3:4 */
.board{aspect-ratio:3/4!important;}

/* V8.1 - verrouillage reel des proportions sur iOS */
.board{
  aspect-ratio:3/4!important;
  grid-template-columns:repeat(4,minmax(0,1fr))!important;
  grid-template-rows:repeat(4,minmax(0,1fr))!important;
}

/* V9 - aimantation des pieces seules */
.tile.magnet-target{
  z-index:6;
}
.tile.magnet-target::after{
  content:"";
  position:absolute;
  inset:3px;
  border:3px solid rgba(255,216,72,.98);
  border-radius:10px;
  box-shadow:0 0 0 2px rgba(255,255,255,.8),0 0 16px rgba(255,198,48,.9);
  pointer-events:none;
  animation:magnetPulse .7s ease-in-out infinite alternate;
}
@keyframes magnetPulse{
  from{opacity:.68;transform:scale(.97)}
  to{opacity:1;transform:scale(1)}
}
.tile.magnet-snap{
  animation:magnetSnap .24s cubic-bezier(.2,.9,.25,1);
}
@keyframes magnetSnap{
  0%{filter:brightness(1)}
  45%{filter:brightness(1.35)}
  100%{filter:brightness(1)}
}

/* V10 - la zone aimantee peut couvrir 1, 2 ou 3 cases */
.tile.magnet-target::after{
  border-width:3px;
  border-color:rgba(255,216,72,.98);
}

/* V14 - celebration 4 s, plus visible, sans clignotement du quadrillage interieur */
.tile.completion-celebrate{
  z-index:12;
  animation:completionCelebrateV14 4s ease-in-out both;
}
.tile.completion-celebrate .tile-inner{
  animation:completionImageGlowV14 4s ease-in-out both;
}
/* Pendant la célébration, aucune bordure intérieure ne doit réapparaître/clignoter. */
.tile.completion-celebrate.joined-top .tile-edge.top,
.tile.completion-celebrate.joined-right .tile-edge.right,
.tile.completion-celebrate.joined-bottom .tile-edge.bottom,
.tile.completion-celebrate.joined-left .tile-edge.left{
  display:none!important;
  opacity:0!important;
  animation:none!important;
}
@keyframes completionCelebrateV14{
  0%{filter:brightness(1) saturate(1);box-shadow:0 0 0 rgba(255,211,55,0)}
  12%{filter:brightness(1.48) saturate(1.3);box-shadow:0 0 24px rgba(255,211,55,.98),inset 0 0 0 3px rgba(255,245,170,.95)}
  28%{filter:brightness(1.10) saturate(1.08);box-shadow:0 0 8px rgba(255,211,55,.45),inset 0 0 0 2px rgba(255,245,170,.65)}
  44%{filter:brightness(1.55) saturate(1.35);box-shadow:0 0 30px rgba(255,211,55,1),inset 0 0 0 4px rgba(255,250,190,1)}
  62%{filter:brightness(1.12) saturate(1.1);box-shadow:0 0 10px rgba(255,211,55,.5),inset 0 0 0 2px rgba(255,245,170,.7)}
  80%{filter:brightness(1.5) saturate(1.32);box-shadow:0 0 28px rgba(255,211,55,.98),inset 0 0 0 4px rgba(255,250,190,.98)}
  100%{filter:brightness(1.28) saturate(1.18);box-shadow:0 0 18px rgba(255,211,55,.8),inset 0 0 0 3px rgba(255,245,170,.85)}
}
@keyframes completionImageGlowV14{
  0%,100%{filter:brightness(1) saturate(1.05)}
  22%,66%{filter:brightness(1.22) saturate(1.35)}
  44%,88%{filter:brightness(1.08) saturate(1.15)}
}
@media (prefers-reduced-motion:reduce){
  .tile.completion-celebrate,.tile.completion-celebrate .tile-inner{animation:none}
}

/* V12 - plateau 4x4, morceaux plus grands */
.board{
  grid-template-columns:repeat(4,minmax(0,1fr))!important;
  grid-template-rows:repeat(4,minmax(0,1fr))!important;
  aspect-ratio:3/4!important;
}

/* V12.1 - les cases vides restent utilisables comme destinations */
.tile:has(.tile-inner[style*="background-image: ;"]) {
  background:rgba(255,255,255,.08);
}
.tile.magnet-target{
  background-color:rgba(255,225,92,.14);
}

/* V13 - cases vides sombres et clairement identifiables */
.tile.empty-tile{
  background:#17242c!important;
}
.tile.empty-tile .tile-inner{
  background-image:none!important;
  background-color:#17242c!important;
}
.tile.empty-tile .tile-edge{
  background:rgba(255,255,255,.10);
  box-shadow:none;
}
.tile.empty-tile.magnet-target{
  background:#263942!important;
}

/* V14.1 - correction definitive du quadrillage pendant la celebration */
.tile.completion-celebrate{
  animation:none!important;
  filter:none!important;
  box-shadow:none!important;
}
.tile.completion-celebrate .tile-inner{
  animation:none!important;
  filter:none!important;
}
.tile.completion-celebrate .tile-edge{
  display:none!important;
  opacity:0!important;
  visibility:hidden!important;
  animation:none!important;
  transition:none!important;
}
.completion-unified{
  position:absolute;
  z-index:40;
  pointer-events:none;
  background-size:100% 100%;
  background-position:center;
  background-repeat:no-repeat;
  border-radius:5px;
  outline:3px solid rgba(255,245,170,.95);
  animation:completionUnifiedV141 4s ease-in-out both;
  transform-origin:center;
}
@keyframes completionUnifiedV141{
  0%{filter:brightness(1) saturate(1);box-shadow:0 0 0 rgba(255,211,55,0)}
  12%{filter:brightness(1.5) saturate(1.35);box-shadow:0 0 28px rgba(255,211,55,1)}
  28%{filter:brightness(1.08) saturate(1.08);box-shadow:0 0 8px rgba(255,211,55,.45)}
  44%{filter:brightness(1.58) saturate(1.4);box-shadow:0 0 34px rgba(255,211,55,1)}
  62%{filter:brightness(1.1) saturate(1.1);box-shadow:0 0 10px rgba(255,211,55,.5)}
  80%{filter:brightness(1.52) saturate(1.36);box-shadow:0 0 32px rgba(255,211,55,1)}
  100%{filter:brightness(1.3) saturate(1.2);box-shadow:0 0 20px rgba(255,211,55,.85)}
}

/* V15 - zone tampon autour de la grille pour rendre visible le halo des images terminees */
.board-wrap{
  padding:15px!important;
  overflow:visible!important;
}
.board{
  overflow:visible!important;
}
.completion-unified{
  z-index:60!important;
}

/* V16 - choix du theme Pexels */
.theme-overlay{
  position:fixed;inset:0;z-index:120;background:rgba(13,33,44,.78);
  display:grid;place-items:center;padding:18px;
}
.theme-overlay.hidden{display:none}
.theme-card{
  width:min(100%,430px);max-height:calc(100% - 24px);overflow:auto;
  background:linear-gradient(180deg,#fffdf2,#f4e6b5);
  border:4px solid #fff;border-radius:28px;padding:20px 16px;
  box-shadow:0 24px 70px rgba(0,0,0,.35);text-align:center
}
.theme-icon{font-size:46px}
.theme-card h2{margin:4px 0 6px;color:#673eb9;font-size:27px}
.theme-card p{margin:0 4px 16px;font-size:13px;line-height:1.35}
.theme-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.theme-btn{
  min-height:82px;border:3px solid #fff;border-radius:18px;
  background:linear-gradient(180deg,#59c7cf,#238895);color:#fff;
  box-shadow:0 5px 0 #155b64;font-family:inherit;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  font-size:15px;font-weight:900
}
.theme-btn span{font-size:30px}.theme-btn:active{transform:translateY(3px);box-shadow:0 2px 0 #155b64}
.theme-btn.theme-surprise{grid-column:1/-1;background:linear-gradient(180deg,#936de1,#6944b7);box-shadow:0 5px 0 #4b3186}
.theme-source{margin-top:16px;font-size:12px;color:#52616a}.theme-source a{color:#4a3599;font-weight:900}

/* Attribution Pexels dans la popup de reussite */
.photo-credit{
  font-size:12px;line-height:1.35;color:#3e5360;margin:9px 4px 12px;
}
.photo-credit a{color:#4d3aa2;font-weight:900;text-decoration:underline}
.completion-continue{
  border:0;border-radius:15px;padding:12px 18px;min-height:46px;
  background:linear-gradient(180deg,#7fdc60,#3ca83c);color:#fff;
  font-family:inherit;font-size:16px;font-weight:900;box-shadow:0 5px 0 #2c7d2e;
}
.completion-continue:active{transform:translateY(3px);box-shadow:0 2px 0 #2c7d2e}

/* V17 - cible d'echange entre paires de meme orientation */
.tile.magnet-target.grouped{
  outline:3px solid rgba(255,216,72,.95);
  outline-offset:-3px;
}