* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%; height: 100%;
  background: #050510;
  overflow: hidden;
  font-family: 'Segoe UI', Arial, sans-serif;
}
#game-container {
  position: relative;
  width: 100vw; height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #050510;
}
#gameCanvas {
  display: block;
  max-width: 100vw;
  max-height: 100vh;
  object-fit: contain;
  background: #050510;
}
#score-display {
  position: absolute;
  top: 18px; right: 24px;
  font-size: 32px;
  font-weight: 900;
  color: #fff;
  text-shadow: 0 2px 12px #f39c1288;
  letter-spacing: 2px;
  z-index: 10;
  pointer-events: none;
}
#game-over-overlay, #start-overlay {
  position: absolute;
  inset: 0;
  background: rgba(5,5,16,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
}
#game-over-overlay.hidden, #start-overlay.hidden {
  display: none;
}
#game-over-box, #start-box {
  background: linear-gradient(135deg, #111133 60%, #1a0a2e 100%);
  border-radius: 18px;
  padding: 36px 40px;
  text-align: center;
  box-shadow: 0 0 40px #f39c1233;
  border: 2px solid #f39c1244;
}
#game-over-box h1, #start-box h1 {
  color: #f39c12;
  font-size: 32px;
  margin-bottom: 12px;
  text-shadow: 0 0 18px #f39c1266;
}
#game-over-box p, #start-box p {
  color: #b0c4de;
  font-size: 17px;
  margin-bottom: 8px;
}
#restart-btn, #start-btn {
  margin-top: 18px;
  padding: 14px 44px;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 4px 18px #f39c1255;
  transition: transform 0.12s;
}
#restart-btn:active, #start-btn:active {
  transform: scale(0.95);
}