:root{--bg: #0d1218;--panel: #161d27;--line: #28323f;--ink: #eef4fa;--dim: #91a3b6;--accent: #5a8fc0;--ok: #4ec98a;--bad: #d65b6a;--paper: #f4f1e8;--paperline: #2a2a2a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#14202c,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:560px;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:#06131f}.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:#06131f;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 20px 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}.scene{display:flex;gap:10px;align-items:stretch;justify-content:center}.shaft{display:flex;flex-direction:column;width:64px;background:#0a0e13;border:1px solid var(--line);border-radius:8px;overflow:hidden}.shaft .floor{flex:1 1 0;min-height:16px;display:flex;align-items:center;justify-content:space-between;padding:0 6px;border-bottom:1px solid #161d27;color:var(--dim);font:700 11px ui-monospace,monospace}.shaft .floor:last-child{border-bottom:none}.shaft .floor.done{background:#122230;color:#79b0d8}.shaft .floor.here{background:#1d3850;color:var(--ink)}.shaft .floor .car{font-size:15px}.staffwrap{flex:1;background:var(--paper);border:1px solid var(--line);border-radius:8px;display:flex;align-items:center;justify-content:center;padding:6px;min-height:220px}#staff{width:100%;height:100%;max-height:240px}.staffline{stroke:var(--paperline);stroke-width:1.4}.ledger{stroke:var(--paperline);stroke-width:1.8}.stem{stroke:#111;stroke-width:2}.head{fill:#111}.clef{fill:#111;font-size:64px;font-family:serif}.prompttext{fill:#555;font:700 13px system-ui}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080c10cc;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;line-height:1.5}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.keyboard{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;max-width:520px;margin:14px auto 0}.key{background:var(--paper);color:#1a1a1a;border:1px solid #c8c2b0;border-radius:0 0 6px 6px;padding:14px 0 8px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px;font-family:ui-monospace,monospace;transition:background .08s,transform .05s}.key:hover{background:#fff}.key:active{transform:translateY(1px)}.key .kl{font:800 16px ui-monospace,monospace}.key .ko{font:600 10px ui-monospace,monospace;color:#777}.key.ok{background:var(--ok);color:#06231a}.key.bad{background:var(--bad);color:#2a0a0e}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:14px;line-height:1.5}.hint b{color:var(--accent)}