html,body{margin:0;padding:0;min-height:100%;background:radial-gradient(120% 90% at 50% 0%,#141d42 0%,#0a0a18 70%);
  color:#e2e8f0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;
  display:flex;flex-direction:column;align-items:center;touch-action:manipulation;
  -webkit-tap-highlight-color:transparent;user-select:none}
#stage{width:min(96vw,480px);display:flex;flex-direction:column;align-items:center}
#topbar{display:flex;gap:8px;margin:10px 0 8px;flex-wrap:wrap;justify-content:center}
.tab{font:inherit;font-size:.88rem;font-weight:700;min-height:44px;padding:8px 16px;border:1px solid #2b3564;
  background:rgba(20,26,53,.85);color:#94a3b8;border-radius:999px;cursor:pointer;transition:all .2s}
.tab.on{background:linear-gradient(135deg,#22d3ee,#a78bfa);border-color:transparent;color:#0b1020;
  box-shadow:0 0 14px rgba(34,211,238,.35)}
#hud{display:flex;gap:8px;align-items:center;margin-bottom:8px;flex-wrap:wrap;justify-content:center}
.stat{background:rgba(20,26,53,.85);border:1px solid #2b3564;border-radius:999px;padding:6px 12px;
  font-size:.82rem;color:#94a3b8;min-height:32px;display:flex;align-items:center}
.stat b{color:#e2e8f0;font-variant-numeric:tabular-nums}
.pill{font:inherit;font-size:.85rem;font-weight:700;min-height:44px;padding:8px 14px;
  border:1px solid #2b3564;background:rgba(20,26,53,.85);color:#e2e8f0;border-radius:999px;cursor:pointer}
.pill:hover{border-color:#22d3ee}
.pill:disabled{opacity:.4;cursor:default}
#comboPill{background:linear-gradient(135deg,#ffd54a,#ff9e40);color:#0b1020;border:0;border-radius:999px;
  padding:8px 12px;font-weight:900;font-size:.8rem;min-height:32px;display:flex;align-items:center}
#comboPill.pop{animation:cpop .35s cubic-bezier(.2,1.6,.4,1)}
@keyframes cpop{0%{transform:scale(1)}40%{transform:scale(1.25)}100%{transform:scale(1)}}
/* board + overlays */
#boardWrap{position:relative;padding:14px 10px;margin:0 -4px}
#grid{display:grid;grid-template-columns:repeat(var(--cols,6),1fr);gap:6px;width:min(92vw,440px)}
.tile{min-width:44px;min-height:44px;aspect-ratio:1/1;border-radius:12px;border:1px solid rgba(43,53,100,.9);
  background:rgba(20,26,53,.85);color:#e2e8f0;font-size:clamp(1.15rem,6.4vw,1.7rem);line-height:1;
  display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0;
  transition:transform .12s,border-color .15s,box-shadow .15s,opacity .3s}
.tile:hover{transform:translateY(-2px)}
.tile:focus-visible{outline:2px solid #22d3ee;outline-offset:2px}
.tile.sel{border-color:#00e5ff;box-shadow:0 0 14px rgba(0,229,255,.55),inset 0 0 10px rgba(0,229,255,.25);
  transform:translateY(-3px)}
.tile.kcur{outline:2px dashed #a78bfa;outline-offset:1px}
.tile.gone{visibility:hidden;pointer-events:none}
.tile.shake{animation:gshake .4s ease-out}
@keyframes gshake{0%,100%{transform:none}25%{transform:translateX(-6px)}60%{transform:translateX(5px)}}
.tile.hinted{animation:hglow 1.1s ease-in-out 2}
@keyframes hglow{0%,100%{box-shadow:0 0 4px rgba(255,213,74,.2)}50%{box-shadow:0 0 18px rgba(255,213,74,.9);transform:translateY(-2px)}}
.tile.flip{animation:flipin .4s ease-out}
@keyframes flipin{0%{transform:rotateY(90deg) scale(.8)}100%{transform:none}}
#links,#fx{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}
#links .lglow{fill:none;stroke:#ffd54a;stroke-width:9;stroke-opacity:.32;stroke-linecap:round;stroke-linejoin:round}
#links .lcore{fill:none;stroke:#ffd54a;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(0 0 4px rgba(255,213,74,.8))}
.pt{position:absolute;width:7px;height:7px;border-radius:50%;pointer-events:none;
  animation:pburst .6s ease-out forwards}
@keyframes pburst{0%{transform:translate(0,0) scale(1);opacity:1}
  100%{transform:translate(var(--dx),var(--dy)) scale(.2);opacity:0}}
#msg{min-height:22px;margin:8px 0;font-size:.9rem;text-align:center;font-weight:600;color:#7c8db5}
/* end panel */
.overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(5,5,20,.88);backdrop-filter:blur(4px);z-index:20}
.overlay.hide,.hide{display:none}
.panel{background:rgba(20,26,53,.95);border:1px solid rgba(34,211,238,.4);border-radius:16px;
  padding:22px 26px;text-align:center;max-width:min(92vw,420px);
  animation:panelin .4s cubic-bezier(.2,1.4,.4,1)}
@keyframes panelin{from{transform:translateY(30px) scale(.85);opacity:0}to{transform:none;opacity:1}}
.panel h2{margin:0 0 4px;font-size:1.3rem;background:linear-gradient(135deg,#22d3ee,#a78bfa);
  -webkit-background-clip:text;background-clip:text;color:transparent}
#epRank{font-size:1.5rem;font-weight:900;color:#ffd54a;margin-bottom:10px;text-shadow:0 0 14px rgba(255,213,74,.5)}
.er{display:flex;justify-content:space-between;gap:18px;font-size:.88rem;color:#94a3b8;
  padding:3px 0;border-bottom:1px dashed rgba(43,53,100,.6)}
.er b{color:#e2e8f0;font-variant-numeric:tabular-nums}
.panel p{margin:10px 0 12px;color:#94a3b8;font-size:.82rem}
.panel button{display:block;width:100%;font:inherit;font-weight:800;min-height:44px;margin-top:8px;
  border:0;border-radius:10px;background:linear-gradient(135deg,#22d3ee,#a78bfa);color:#0b1020;cursor:pointer}
.panel button:last-child{background:rgba(20,26,53,.9);color:#e2e8f0;border:1px solid #2b3564}
/* confetti */
.cf{position:fixed;top:-4%;width:8px;height:12px;border-radius:2px;pointer-events:none;z-index:21;
  animation:cfall 1.1s ease-in forwards}
@keyframes cfall{0%{transform:translate(0,0) rotate(0);opacity:1}
  100%{transform:translate(var(--dx),58vh) rotate(540deg);opacity:0}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}