:root{
  --bg:#0f1420;
  --bg-2:#161d2c;
  --felt:#1b2433;
  --line:rgba(255,255,255,.10);
  --txt:#e9eef7;
  --txt-dim:#93a0b8;
  --accent:#4ad6a5;
  --accent-2:#7db7ff;
  --danger:#ff7a7a;
  --radius:14px;
  --safe-t:env(safe-area-inset-top,0px);
  --safe-b:env(safe-area-inset-bottom,0px);
  --safe-l:env(safe-area-inset-left,0px);
  --safe-r:env(safe-area-inset-right,0px);
}

*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--txt);
  font:16px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  overflow:hidden;
  overscroll-behavior:none;
  -webkit-tap-highlight-color:transparent;
  -webkit-text-size-adjust:100%;
}
button{font:inherit;color:inherit}

.screen{position:fixed;inset:0;display:none;flex-direction:column}
.screen.is-active{display:flex}

/* ---------- Accueil ---------- */
.home-head{
  padding:calc(var(--safe-t) + 22px) 20px 10px;
  text-align:center;
}
.home-head h1{
  margin:0;font-size:clamp(26px,7vw,40px);font-weight:800;letter-spacing:-.02em;
}
.home-head h1 span{
  background:linear-gradient(92deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.tagline{margin:6px 0 0;color:var(--txt-dim);font-size:14px}

.home-scroll{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:16px}
.level-grid{
  display:grid;gap:14px;max-width:960px;margin:0 auto;
  grid-template-columns:repeat(auto-fill,minmax(150px,1fr));
}
.level-card{
  position:relative;display:block;width:100%;padding:0;cursor:pointer;
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;text-align:left;transition:transform .12s ease,border-color .12s ease;
}
.level-card:active{transform:scale(.975)}
@media (hover:hover){.level-card:hover{border-color:rgba(122,214,180,.5)}}
.level-card canvas{display:block;width:100%;aspect-ratio:4/3;background:#0b0f18}
.level-card .lc-body{padding:9px 11px 11px}
.level-card .lc-name{font-weight:650;font-size:15px}
.level-card .lc-meta{font-size:12px;color:var(--txt-dim);margin-top:2px;min-height:17px}
.level-card .lc-badge{
  position:absolute;top:8px;right:8px;background:rgba(15,20,32,.82);
  border:1px solid var(--line);border-radius:999px;padding:2px 8px;font-size:11px;
}
.level-card .lc-badge.done{color:var(--accent);border-color:rgba(74,214,165,.45)}
.hint-footer{text-align:center;color:var(--txt-dim);font-size:12px;margin:18px 0 6px}

.home-foot{
  display:flex;gap:10px;justify-content:center;flex-wrap:wrap;
  padding:10px 16px calc(var(--safe-b) + 14px);border-top:1px solid var(--line);
}

/* ---------- Boutons ---------- */
.btn{
  border:1px solid var(--line);background:var(--bg-2);border-radius:11px;
  padding:11px 16px;min-height:44px;cursor:pointer;font-weight:600;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(180deg,#4ad6a5,#2fb98a);border-color:transparent;color:#06221a}
.btn-ghost{background:transparent}
.btn-danger{color:var(--danger)}
.icon-btn{
  width:44px;height:44px;flex:0 0 44px;border-radius:12px;cursor:pointer;
  background:rgba(22,29,44,.86);border:1px solid var(--line);
  display:grid;place-items:center;font-size:20px;line-height:1;backdrop-filter:blur(8px);
}
.icon-btn:active{transform:scale(.94)}

/* ---------- Jeu ---------- */
#screen-game{background:var(--felt)}
#board{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab}
#board.dragging{cursor:grabbing}

.hud{position:absolute;left:0;right:0;z-index:5;pointer-events:none}
.hud>*{pointer-events:auto}
.hud-top{
  top:0;display:flex;align-items:center;gap:10px;
  padding:calc(var(--safe-t) + 8px) calc(var(--safe-r) + 10px) 8px calc(var(--safe-l) + 10px);
  background:linear-gradient(180deg,rgba(15,20,32,.92),rgba(15,20,32,0));
}
.hud-info{flex:1;min-width:0;pointer-events:none}
.hud-title{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hud-sub{font-size:12px;color:var(--txt-dim);font-variant-numeric:tabular-nums}

.progress-ring{position:relative;width:44px;height:44px;flex:0 0 44px;pointer-events:none}
.progress-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.progress-ring circle{fill:none;stroke-width:3}
.ring-bg{stroke:rgba(255,255,255,.14)}
.ring-fg{stroke:var(--accent);stroke-linecap:round;stroke-dasharray:97.4;stroke-dashoffset:97.4;transition:stroke-dashoffset .25s ease}
.progress-ring span{
  position:absolute;inset:0;display:grid;place-items:center;font-size:10px;font-weight:700;
  font-variant-numeric:tabular-nums;
}

.hud-bottom{
  bottom:0;display:flex;align-items:flex-end;gap:8px;
  padding:14px calc(var(--safe-r) + 10px) calc(var(--safe-b) + 10px) calc(var(--safe-l) + 10px);
  background:linear-gradient(0deg,rgba(15,20,32,.92),rgba(15,20,32,0));
}
.tool-row{flex:1;display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.tool-row::-webkit-scrollbar{display:none}
.tool{
  flex:0 0 auto;min-width:62px;min-height:52px;border-radius:12px;cursor:pointer;
  background:rgba(22,29,44,.88);border:1px solid var(--line);backdrop-filter:blur(8px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:6px 8px;
}
.tool:active{transform:scale(.94)}
.tool[aria-pressed="true"]{border-color:var(--accent);color:var(--accent);background:rgba(74,214,165,.14)}
.tool:disabled{opacity:.38;cursor:default}
.tool-ico{font-size:18px;line-height:1}
.tool-lbl{font-size:10.5px;color:var(--txt-dim);white-space:nowrap}
.tool[aria-pressed="true"] .tool-lbl{color:inherit}
.zoom-row{display:flex;flex-direction:column;gap:6px}

.toast{
  position:absolute;left:50%;top:calc(var(--safe-t) + 66px);transform:translate(-50%,-8px);
  z-index:6;background:rgba(10,14,22,.92);border:1px solid var(--line);border-radius:999px;
  padding:8px 16px;font-size:13px;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;
  max-width:88vw;text-align:center;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- Modales ---------- */
.modal-layer{
  position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:16px;
  background:rgba(6,9,15,.72);backdrop-filter:blur(4px);overflow-y:auto;
}
.modal{
  width:min(420px,100%);background:var(--bg-2);border:1px solid var(--line);
  border-radius:18px;padding:18px;box-shadow:0 20px 60px rgba(0,0,0,.5);
  margin:auto;
}
.modal h2{margin:0 0 12px;font-size:20px}
.preview-wrap{border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#0b0f18}
.preview{display:block;width:100%;height:auto}
.field{display:block;margin:16px 0 6px}
.field-lbl{display:block;font-size:13px;color:var(--txt-dim);margin-bottom:8px}
input[type=range]{width:100%;height:36px;accent-color:var(--accent)}
.diff-readout{text-align:center;font-size:17px}
.diff-readout strong{font-size:22px;color:var(--accent)}
.muted{color:var(--txt-dim);font-size:13px}
.note{color:var(--txt-dim);font-size:12.5px;margin:10px 0 0;min-height:1em}
.resume-box{margin-top:14px;padding:12px;border:1px dashed rgba(125,183,255,.45);border-radius:12px;text-align:center}
.resume-box p{margin:0 0 10px;font-size:13px;color:var(--txt-dim)}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}
.modal-actions .btn{flex:1}
.switch{display:flex;align-items:center;gap:10px;padding:9px 0;font-size:14px;cursor:pointer}
.switch input{width:20px;height:20px;accent-color:var(--accent);flex:0 0 auto}
.win-line{text-align:center;margin:14px 0 0;font-size:14px;color:var(--txt-dim)}

/* ---------- Loader ---------- */
.loader{
  position:fixed;inset:0;z-index:30;display:flex;flex-direction:column;gap:14px;
  align-items:center;justify-content:center;background:rgba(15,20,32,.9);font-size:14px;color:var(--txt-dim);
}
.spinner{
  width:34px;height:34px;border-radius:50%;
  border:3px solid rgba(255,255,255,.14);border-top-color:var(--accent);
  animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

@media (max-width:420px){
  .tool{min-width:56px}
  .level-grid{grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:10px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
}