:root{--bg: #06101a;--panel: #0e1d2a;--accent: #4a9cc0;--text: #d8e6ef;--muted: #7e93a3}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased}#app{max-width:720px;margin:0 auto;padding:18px 16px 40px}header h1{margin:0;letter-spacing:6px;font-size:28px;color:var(--accent);text-shadow:0 0 18px rgba(74,156,192,.35)}header .sub{margin:4px 0 14px;color:var(--muted);font-size:13px}.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:10px}.seg{display:inline-flex;border:1px solid #1d3343;border-radius:8px;overflow:hidden}.seg button{background:transparent;color:var(--muted);border:none;padding:7px 12px;cursor:pointer;font-size:13px}.seg button.active{background:var(--accent);color:#04121a;font-weight:600}.btn{background:#15293a;color:var(--text);border:1px solid #21465c;border-radius:8px;padding:7px 14px;cursor:pointer;font-size:13px}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#04121a;font-weight:700}.status{font-size:12.5px;color:var(--muted);margin:6px 0 8px;min-height:18px}.stage{position:relative;display:inline-block;width:100%}canvas{width:100%;height:auto;display:block;border:1px solid #1d3343;border-radius:12px;background:#0a1620;touch-action:none}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#040c14b8;border-radius:12px}.overlay.hidden{display:none}.overlay .card{background:var(--panel);border:1px solid #21465c;border-radius:12px;padding:22px 26px;text-align:center;max-width:320px}.overlay .card h2{margin:0 0 6px;color:var(--accent)}.overlay .card p{margin:0 0 16px;color:var(--text);font-size:14px}.hint{margin-top:12px;font-size:12.5px;color:var(--muted);line-height:1.5}