html, body {
  height: 100%;
  margin: 0;
  background: #0b1220;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
}
canvas {
  background: #071018;
  border: 4px solid #123;
  display: block;
}
#ui {
  position: fixed;
  left: 12px;
  top: 12px;
  color: #cfe;
}
#score { font-size: 18px; font-weight: 600; }
#info { font-size: 12px; opacity: 0.85; margin-top: 4px }

/* Responsive: keep canvas sharp but not too big */
@media (min-width: 900px) {
  canvas { transform: scale(1); }
}