:root{
  --bg:#0f1724;
  --card:#0b1220;
  --accent:#60a5fa;
  --muted:#94a3b8;
  --success:#34d399;
  --danger:#fb7185;
  --glass: rgba(255,255,255,0.03);
  --font-sans: 'Segoe UI', Roboto, system-ui, -apple-system, 'Noto Sans', sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font-sans);
  background:linear-gradient(180deg,#021025 0%, #071327 100%);
  color:#e6eef8;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.container{
  width:100%;
  max-width:920px;
  background:var(--card);
  border-radius:12px;
  padding:18px;
  box-shadow:0 8px 30px rgba(2,6,23,0.6);
}
h1{margin:4px 0 6px;font-size:20px}
.desc{margin:0 0 12px;color:var(--muted)}
.hud{
  display:flex;
  gap:12px;
  justify-content:space-between;
  align-items:center;
  margin-bottom:10px;
  font-size:15px;
}
#game-wrap{
  display:flex;
  gap:18px;
  align-items:flex-start;
}
canvas{
  background:linear-gradient(180deg,#052037,#0b2030);
  border-radius:8px;
  border:4px solid rgba(255,255,255,0.03);
  image-rendering:pixelated;
  touch-action:none;
}
.overlay{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(2,6,23,0.6);
  border-radius:8px;
}
.hidden{display:none}
.overlay-inner{
  background:var(--glass);
  padding:16px 20px;
  border-radius:10px;
  text-align:center;
}
.controls{
  margin-top:14px;
  display:flex;
  gap:12px;
  align-items:center;
  flex-wrap:wrap;
}
.controls label{font-size:14px;color:var(--muted)}
.controls select, .controls button{padding:8px 10px;border-radius:8px;border:1px solid rgba(255,255,255,0.04);background:transparent;color:inherit}
.controls button{cursor:pointer}
.note{margin-top:12px;color:var(--muted);font-size:13px}

/* small screens */
@media (max-width:700px){
  .container{padding:12px}
  canvas{width:360px;height:360px}
  h1{font-size:18px}
}