:root{
  --bg:#f9f9f7; --card:#fcfcfb; --text:#0b0b0b; --text2:#52514e; --muted:#898781;
  --grid:#e1e0d9; --border:rgba(11,11,11,.10); --accent:#2a78d6;
  --ok:#0ca30c; --warn:#fab219; --bad:#d03b3b;
  --cell:#fcfcfb; --cellGiven:#f1f0ea; --cellShare:#f6f1e6;
  --hl:#e8eef8; --hlSame:#d8e6fb; --sel:#2a78d6;
  --pad:#f2f1ec;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0d0d0d; --card:#1a1a19; --text:#fff; --text2:#c3c2b7; --muted:#898781;
    --grid:#2c2c2a; --border:rgba(255,255,255,.10); --accent:#3987e5;
    --cell:#161615; --cellGiven:#232320; --cellShare:#262218;
    --hl:#1e2a3a; --hlSame:#25384f; --sel:#3987e5;
    --pad:#141413;
  }
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;overflow:hidden;overscroll-behavior:none}
body{
  background:var(--bg); color:var(--text);
  font:15px/1.35 system-ui,-apple-system,"Segoe UI",sans-serif;
  display:flex; flex-direction:column;
  height:100dvh; user-select:none;
}
.muted{color:var(--muted)}

#bar{
  display:flex; align-items:center; gap:10px; padding:calc(env(safe-area-inset-top) + 8px) 12px 8px;
  background:var(--card); border-bottom:1px solid var(--border); flex:0 0 auto;
}
#gridInfo{flex:1;min-width:0}
#gridName{font-weight:650;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#gridRule{font-size:11.5px;color:var(--text2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#progress{font-size:13px;color:var(--text2);font-variant-numeric:tabular-nums}
#progressNum{font-weight:650;color:var(--text)}
.icon{
  background:none;border:0;color:var(--text);font-size:20px;line-height:1;
  padding:6px 8px;border-radius:8px;cursor:pointer;
}
.icon:active{background:var(--hl)}

/* прозрачности заливок судоку — отдельно для светлой и тёмной темы */
.tone{opacity:.10}
.tone.share{opacity:.16}
.disj{opacity:.17}
.xdiag{opacity:.16}
.sumc{opacity:.22}
@media (prefers-color-scheme: dark){
  .tone{opacity:.13}
  .tone.share{opacity:.20}
  .disj{opacity:.10}
  .xdiag{opacity:.14}
  .sumc{opacity:.20}
}

#stage{flex:1 1 auto;position:relative;overflow:hidden;touch-action:none;background:var(--bg)}
#canvasWrap{position:absolute;inset:0;transform-origin:0 0;will-change:transform}
#board{display:block}
#loader{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--text2);background:var(--bg);font-size:14px;text-align:center;padding:20px;
}
#loader.hidden{display:none}
.round{
  position:absolute;right:12px;bottom:12px;width:42px;height:42px;border-radius:50%;
  border:1px solid var(--border);background:var(--card);color:var(--text);font-size:18px;
  box-shadow:0 2px 8px rgba(0,0,0,.12);cursor:pointer;
}
.round:active{background:var(--hl)}

#pad{
  flex:0 0 auto;background:var(--pad);border-top:1px solid var(--border);
  padding:8px 8px calc(env(safe-area-inset-bottom) + 8px);
}
.row{display:flex;gap:5px;max-width:560px;margin:0 auto}
.row+.row{margin-top:6px}
.nums button{
  flex:1;min-width:0;height:46px;border-radius:10px;border:1px solid var(--border);
  background:var(--card);color:var(--text);font-size:21px;font-weight:600;cursor:pointer;
  display:flex;align-items:center;justify-content:center;position:relative;
}
.nums button:active{background:var(--hlSame)}
.nums button.done{color:var(--muted);background:transparent}
.tools button{
  flex:1;height:40px;border-radius:10px;border:1px solid var(--border);background:var(--card);
  color:var(--text);font-size:16px;cursor:pointer;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:1px;
}
.tools button span{font-size:9.5px;color:var(--text2);letter-spacing:.01em}
.tools button.on{background:var(--accent);color:#fff;border-color:transparent}
.tools button.on span{color:rgba(255,255,255,.85)}
.tools button:active{background:var(--hlSame)}

#sheet{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:20;display:flex;align-items:flex-end}
#sheet.hidden,#toast.hidden,#win.hidden{display:none}
.sheetInner{
  background:var(--card);width:100%;max-height:85dvh;overflow:auto;
  border-radius:16px 16px 0 0;padding:14px 16px calc(env(safe-area-inset-bottom) + 16px);
}
.sheetHead{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.lead{color:var(--text2);font-size:13px;margin:4px 0 12px}
.btns{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.btns button{
  flex:1;min-width:120px;padding:11px 8px;border-radius:10px;border:1px solid var(--border);
  background:var(--bg);color:var(--text);font-size:14px;cursor:pointer;
}
.btns button.danger{color:var(--bad)}
.btns button:active{background:var(--hl)}
#rules{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.ruleItem{display:flex;gap:9px;align-items:flex-start;font-size:12.5px;color:var(--text2)}
.ruleItem b{color:var(--text);font-weight:600;font-size:13px;display:block}
.swatch{width:13px;height:13px;border-radius:3px;flex:0 0 auto;margin-top:2px;border:1px solid var(--border)}
.foot{font-size:11px;color:var(--muted);margin:14px 0 0;text-align:center}

#toast{
  position:fixed;left:50%;transform:translateX(-50%);bottom:calc(env(safe-area-inset-bottom) + 110px);
  background:var(--text);color:var(--bg);padding:9px 14px;border-radius:20px;font-size:13px;z-index:30;
  max-width:88vw;text-align:center;box-shadow:0 4px 14px rgba(0,0,0,.2);
}
#win{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:40;display:flex;align-items:center;justify-content:center}
.winInner{background:var(--card);border-radius:16px;padding:24px;text-align:center;max-width:320px;width:86%}
.winInner .big{font-size:46px}
.winInner h2{margin:6px 0}
.winInner p{color:var(--text2);font-size:13.5px}
.winInner button{
  margin-top:10px;padding:11px 18px;border-radius:10px;border:0;background:var(--accent);
  color:#fff;font-size:15px;cursor:pointer;
}