:root{
  color-scheme:dark;
  --bg:#08090A;--panel:#0F1213;--cell:#151A1C;--line:#1E2224;--ink:#E7EAEA;--muted:#757C7F;
  --accent:#6E9BD8;--hot:#C4564E;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --sans:"Instrument Sans","Segoe UI",system-ui,sans-serif;
  box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
}
*,*::before,*::after{box-sizing:inherit}
html,body{height:100%}html{background:var(--bg)}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.6 var(--sans);-webkit-font-smoothing:antialiased;
  display:flex;flex-direction:column;align-items:center;padding:22px 16px 28px}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.top{width:min(100%,420px);display:flex;justify-content:space-between;align-items:center}
.brand{font:500 13px/1 var(--mono);color:var(--muted)}
.brand span{color:var(--ink)}
.app{width:min(100%,420px);margin-top:24px}
.hud{display:flex;gap:26px;margin-bottom:12px}
.hud .stat:last-child{margin-left:auto}
.stat{display:flex;flex-direction:column;gap:4px}
.stat .k{font:400 11px/1 var(--mono);color:var(--muted)}
.stat .v{font:500 17px/1 var(--mono);font-variant-numeric:tabular-nums}
.state{margin:0 0 12px;font:400 12px/1 var(--mono);color:var(--muted);height:12px}
.state.warn{color:var(--hot)}
.boardwrap{position:relative;aspect-ratio:1;padding:10px}
.board{position:absolute;inset:10px;display:grid;grid-template-columns:repeat(3,1fr);gap:10px;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:10px;
  rotate:0deg;transition:rotate .6s cubic-bezier(.6,0,.2,1)}
.notch{position:absolute;top:-1px;left:-1px;width:26px;height:26px;border-top:2px solid var(--accent);
  border-left:2px solid var(--accent);border-radius:14px 0 0 0}
.node{border:0;padding:0;background:var(--cell);border-radius:10px;cursor:pointer;
  box-shadow:inset 0 0 0 1px var(--line);transition:background .12s,box-shadow .12s}
.node::after{content:"";display:block;width:8px;height:8px;border-radius:50%;background:#2A2F31;margin:auto;
  position:relative;top:calc(50% - 4px)}
.node.on{background:var(--accent);box-shadow:inset 0 0 0 1px var(--accent),0 0 18px rgba(110,155,216,.35)}
.node.bad{background:var(--hot);box-shadow:inset 0 0 0 1px var(--hot)}
.board.lockout .node{cursor:default}
.overlay{position:absolute;inset:0;display:grid;place-items:center;padding:16px;background:rgba(8,9,10,.92);border-radius:14px;z-index:2}
.card{width:100%;max-width:330px}
.card h1{margin:0 0 10px;font:700 20px/1.2 var(--mono)}
.card h1.bad{color:var(--hot)}
.card p{margin:0 0 14px;color:var(--muted);font-size:14px}
.rules{margin:0 0 18px;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px}
.rules li{font:400 12.5px/1.55 var(--mono);color:var(--muted);padding-left:14px;position:relative}
.rules li::before{content:"·";position:absolute;left:2px;color:var(--line)}
.score-rows{margin:0 0 18px;font:400 12.5px/1.9 var(--mono);color:var(--muted)}
.score-rows div{display:flex;justify-content:space-between}
.score-rows b{color:var(--ink);font-weight:500}
.btn{background:var(--ink);color:var(--bg);border:0;border-radius:8px;font:600 14px/1 var(--sans);padding:12px 20px;cursor:pointer}
.btn:hover{opacity:.85}
.hint{margin:14px 0 0;font:400 11.5px/1.6 var(--mono);color:var(--muted);text-align:center}
.foot{margin-top:auto;padding-top:34px;font:400 11px/1 var(--mono);color:#43494B}
@media (max-width:600px){
  *,*::before,*::after{transition:none!important;animation:none!important}
  body{padding:16px 12px 20px}
  .node.on{box-shadow:inset 0 0 0 1px var(--accent)}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}