:root{--bg: #0e1411;--panel: #182019;--line: #2a3730;--ink: #eef7f1;--dim: #93b3a4;--accent: #5a9c6a;--ok: #6fd08a;--bad: #d06a6a;--here: #1f3d2c}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#16221a,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:6px;font-weight:800;color:var(--accent)}.sub{margin:4px 0 0;color:var(--dim);font-size:13px}.sub b{color:var(--ink)}.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 16px;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 14px}.readout{background:#0a110d;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 20px 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}.tower{display:flex;flex-direction:column;gap:3px;max-width:460px;margin:0 auto 16px}.floor{display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--line);border-radius:7px;padding:6px 10px;opacity:.5;transition:opacity .15s,background .15s}.floor.below{opacity:.78}.floor.here{opacity:1;background:var(--here);border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}.fnum{font:800 14px ui-monospace,monospace;color:var(--accent);min-width:18px;text-align:center}.fkeys{font:700 13px ui-monospace,monospace;color:var(--ink);letter-spacing:2px;flex:1}.fnew{font:700 11px ui-monospace,monospace;color:var(--dim)}.floor.here .fnew{color:var(--ok)}.stage{position:relative;display:flex;justify-content:center;min-height:120px;align-items:center}.prompt{font:800 clamp(32px,11vw,56px) ui-monospace,monospace;letter-spacing:6px;text-align:center;padding:18px 10px;background:#0a110d;border:1px solid var(--line);border-radius:12px;width:100%;min-height:96px;display:flex;align-items:center;justify-content:center}.prompt .ch{color:var(--dim);padding:0 1px}.prompt .ch.ok{color:var(--ok)}.prompt .ch.bad{color:var(--bad);text-decoration:underline}.prompt .ch.cur{color:var(--ink);border-bottom:3px solid var(--accent)}.status{text-align:center;color:var(--dim);font-size:13px;margin:12px 0 0;min-height:18px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080e0ad1;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:320px}.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:1.6}.card p b{color:var(--ink)}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:16px;line-height:1.6}