html, body {
  margin: 0;
  padding: 0;
  background: #111;
  color: #fff;
  font-family: system-ui, sans-serif;
  text-align: center;
  overflow: hidden;
}

canvas {
  display: block;
  margin: 10px auto;
  background: #1a1a1a;
  border-radius: 12px;
  /* Responsive sizing */
  width: 100%;       /* scale to 90% of container width */
  max-width: 640px; /* optional: limit width on large screens */
  height: auto;     /* maintain original aspect ratio */
}

.hud {
  font-size: 14px;
  margin-top: 6px;
  color: #ccc;
}
.jump-btn {
  display: none;
  width: 100%;
  max-width: 640px;
  margin: 10px auto 0;
  padding: 14px;
  font-size: 20px;
  font-weight: bold;
  border: none;
  border-radius: 10px;
  background: #ff4444;
  color: #fff;
}

@media (max-width: 768px) {
  .jump-btn {
    display: block;
  }
}