:root{ --fg:#0b0b0f; --muted:#666; --line:#eaeaea; --soft:#f7f9ff; --card:#fff; --accent:#111; }
*{box-sizing:border-box}
html,body{height:100%}
body{ margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif; color:var(--fg); background:#fafafa; }
.topbar{ display:flex; align-items:center; justify-content:space-between; padding:14px 18px; border-bottom:1px solid var(--line); background:#fff; position:sticky; top:0; z-index:2; }
.brand{font-weight:800; letter-spacing:.2px}
.tagline{color:var(--muted); font-size:14px}
.wrap{max-width:980px; margin:26px auto; padding:0 14px; display:grid; gap:18px}
.card{ background:var(--card); border:1px solid var(--line); border-radius:14px; padding:16px; box-shadow:0 2px 10px rgba(0,0,0,0.04); }
.label{font-weight:600; display:block; margin-bottom:8px}
.row{display:flex; gap:10px}
.input{ flex:1; padding:12px 14px; border:1px solid var(--line); border-radius:12px; font-size:16px; }
.btn{ padding:12px 16px; border-radius:12px; border:1px solid var(--line); background:#111; color:#fff; cursor:pointer; }
.btn:hover{opacity:.92}
.hint{color:var(--muted); margin-top:10px; font-size:14px}
.play .hud{display:flex; align-items:center; justify-content:space-between; margin-bottom:10px}
.title{font-weight:700}
.status{color:var(--muted); font-size:14px}
canvas{width:100%; height:auto; border:1px solid var(--line); border-radius:12px; background:#ffffff}
.foot{color:var(--muted); text-align:center; padding:24px 0}
@media (max-width:900px){ canvas{height:auto} }