:root{--bg: #15100e;--panel: #241b18;--line: #3a2c27;--ink: #f5ede9;--dim: #b59a90;--accent: #c75d4a;--wall: #120d0b;--plain: #2c211d;--op: #2a3340;--cond: #3a3322;--good: #3e7d5a;--bad: #6a2b2b}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#221713,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:28px;letter-spacing:5px;font-weight:800;color:var(--accent)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px;text-align:center}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:8px 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 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a0c08}.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(--accent)}.btn.primary{background:var(--accent);color:#1a0c08;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0;flex-wrap:wrap}.readout{background:#0c0807;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:92px;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}.grid{display:grid;gap:3px;background:var(--line);border:2px solid var(--line);border-radius:8px;padding:3px;width:min(94vw,460px);aspect-ratio:1}.cell{position:relative;display:flex;align-items:center;justify-content:center;font-weight:700;aspect-ratio:1;border-radius:4px;overflow:hidden;font-size:clamp(11px,3.4vw,18px)}.cell.wall{background:var(--wall)}.cell.plain{background:var(--plain)}.cell.op{background:var(--op);color:#add3ec}.cell.cond{background:var(--cond);color:#ecd9a8}.cell .lbl{z-index:1}.cell.start{box-shadow:inset 0 0 0 2px var(--good)}.cell.exit{box-shadow:inset 0 0 0 2px var(--accent)}.cell .extag{position:absolute;top:2px;left:0;right:0;text-align:center;font-size:9px;color:var(--accent);font-weight:800;z-index:1}.cell.reach{cursor:pointer;outline:2px dashed rgba(199,93,74,.55);outline-offset:-3px}.cell.reach:hover{filter:brightness(1.25)}.cell.here .lbl{opacity:.25}.cell .pawn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at 50% 40%,var(--accent),#7e3527);color:#fff;font-weight:900;font-size:clamp(12px,4vw,22px);border-radius:50%;margin:auto;width:78%;height:78%;z-index:2;box-shadow:0 2px 8px #00000080}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0c0807cc;border-radius:8px;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:320px}.card h2{margin:0 0 6px;font-size:24px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.howto{margin:14px auto 0;max-width:460px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:4px 14px}.howto summary{cursor:pointer;color:var(--accent);font-weight:700;padding:6px 0}.howto p{color:var(--dim);font-size:13px;line-height:1.5}.howto b{color:var(--ink)}