:root{--bg: #0e1116;--panel: #181d25;--line: #2a323d;--ink: #eef3f7;--dim: #93a4b3;--accent: #2fb37a;--axis: #5b6b7a;--guess: #f2c14e;--found: #2fb37a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#16202a,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:520px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 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:#06201b}.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:#06201b;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0;flex-wrap:wrap}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:84px;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{width:min(94vw,440px);aspect-ratio:1;background:#0a0e13;border:1px solid var(--line);border-radius:8px;touch-action:none;cursor:crosshair}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080c10c7;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:340px}.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}.feedback{text-align:center;margin:12px auto 4px;min-height:26px}.feedback .dir{font:800 22px ui-monospace,monospace;color:var(--guess);letter-spacing:1px}.feedback .dir.found{color:var(--found)}.feedback .msg{color:var(--dim);font-size:13px;margin-top:2px}.history{margin:10px auto 0;max-width:440px;display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.chip{background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:4px 10px;font:700 12px ui-monospace,monospace;color:var(--ink)}.chip .arr{color:var(--guess);margin-left:4px}.chip.found .arr{color:var(--found)}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:12px;line-height:1.5}