* { margin:0; padding:0; box-sizing:border-box; }

body, html {
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #0b0f1a;
  color: #fff;
  font-family: system-ui, sans-serif;
}

main {
  text-align: center;
}

canvas#game {
  background: #111827;
  border: 2px solid #1f2937;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  display: block;
  margin: 0 auto;
}

.controls {
  margin-top: 10px;
  display: flex;
  justify-content: center;
  gap: 20px;
}

.controls button {
  width: 60px;
  height: 60px;
  font-size: 24px;
  border-radius: 12px;
  border: none;
  background: #1f2937;
  color: #fff;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
  user-select: none;
}

.controls button:active {
  background: #374151;
}