:root{--bg: #0f1216;--panel: #1a2028;--line: #2b343e;--ink: #eef3f7;--dim: #93a4b3;--gold: #ffc24a;--key: #4ad6c8;--wall: #3a444f;--diss: #c2563a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#19222b,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:540px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:26px;letter-spacing:4px;font-weight:800;color:var(--gold)}.sub{margin:3px 0 0;color:var(--dim);font-size:12.5px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:9px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 12px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--gold);color:#2a1c06}.lvlsel{background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:999px;padding:6px 12px;font:600 13px system-ui;cursor:pointer}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--gold)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#0c1116;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--gold);min-width:76px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative;display:flex;justify-content:center}.board{position:relative;display:grid;gap:0;background:#0c1116;border:2px solid var(--line);border-radius:12px;padding:6px;width:min(94vw,460px);aspect-ratio:calc(var(--w) / var(--h))}.cell{border:1px solid rgba(255,255,255,.04);border-radius:4px}.cell.wall{background:repeating-linear-gradient(45deg,var(--wall),var(--wall) 6px,#323b45 6px,#323b45 12px);border-color:#4a555f}.cell.dissolvable{background:repeating-linear-gradient(45deg,var(--diss),var(--diss) 6px,#9c4530 6px,#9c4530 12px);border-color:#d4674b;animation:pulse 1.6s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.55}}.cell.exit{box-shadow:inset 0 0 0 3px #ffc24aa6;border-radius:6px}.cell.exit:after{content:"EXIT";position:absolute;font:700 9px system-ui;color:var(--gold);transform:translate(3px,2px);pointer-events:none}.cell.trigger{box-shadow:inset 0 0 0 2px #4ad6c899;border-radius:6px}.cell.trigger.fired{box-shadow:inset 0 0 0 2px #4ad6c833}.block{display:flex;align-items:center;justify-content:center;background:var(--bc);border-radius:7px;margin:3px;cursor:pointer;font-size:20px;color:#0000008c;font-weight:800;box-shadow:0 2px #0000004d,inset 0 1px #ffffff2e;transition:filter .1s}.block:hover{filter:brightness(1.12)}.block.goal{color:#2a1c06}.block.key{color:#06302c}.block.selected{outline:3px solid #fff;outline-offset:-1px;z-index:2}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080c10c7;border-radius:12px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:340px}.card h2{margin:0 0 6px;font-size:24px;color:var(--gold)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px;flex-wrap:wrap}.controls{display:flex;gap:10px;justify-content:center;align-items:center;margin-top:12px;flex-wrap:wrap}.dpad{display:flex;flex-direction:column;align-items:center;gap:4px}.dpad-mid{display:flex;gap:36px}.pad{width:42px;height:36px;background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:8px;font-size:15px;cursor:pointer}.pad:hover{border-color:var(--gold)}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:12px;line-height:1.4}