body {
  margin: 0;
  background: #000;
  color: #fff;
  font-family: Arial, sans-serif;
  text-align: center;
}

.game-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  box-sizing: border-box;
}

.back-button {
  display: inline-block;
  margin: 10px 0 20px;
  padding: 10px 18px;
  background: linear-gradient(145deg, #00c853, #009624);
  color: #fff;
  text-decoration: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: bold;
  border: 2px solid #00ff88;
  box-shadow: 0 4px 10px rgba(0, 255, 100, 0.35);
}

.hud {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin: 10px 0 16px;
  font-size: 18px;
  font-weight: bold;
}

.instructions,
.controls-note {
  max-width: 620px;
  margin: 0 auto 14px;
  line-height: 1.5;
  font-size: 16px;
}

#gameCanvas {
  width: 100%;
  max-width: 760px;
  aspect-ratio: 1 / 1;
  background: #ffffff;
  border: 3px solid #00ff88;
  box-shadow: 0 0 18px rgba(0, 255, 120, 0.35);
  display: block;
  margin: 0 auto 16px;
  touch-action: none;
}