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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0a0a2e 0%, #16213e 50%, #0f3460 100%);
  font-family: 'Courier New', monospace;
  overflow: hidden;
}

#gameContainer {
  position: relative;
  width: 800px;
  height: 600px;
  background: #000;
  border: 3px solid #00ffff;
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.5);
  overflow: hidden;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

#ui {
  position: absolute;
  top: 20px;
  left: 20px;
  color: #00ffff;
  font-size: 18px;
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.8);
  z-index: 10;
}

#gameOver {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: #ff0066;
  font-size: 48px;
  text-shadow: 0 0 20px rgba(255, 0, 102, 0.8);
  display: none;
  z-index: 20;
}

#gameOver button {
  margin-top: 20px;
  padding: 15px 40px;
  font-size: 20px;
  background: linear-gradient(45deg, #ff0066, #00ffff);
  border: none;
  color: #fff;
  cursor: pointer;
  border-radius: 10px;
  font-family: 'Courier New', monospace;
  font-weight: bold;
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.6);
  transition: transform 0.2s;
}

#gameOver button:hover {
  transform: scale(1.1);
}

.star {
  position: absolute;
  background: #fff;
  border-radius: 50%;
  animation: twinkle 2s infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

#controls {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 15px;
  z-index: 10;
}

.control-btn {
  width: 70px;
  height: 70px;
  background: rgba(0, 255, 255, 0.3);
  border: 2px solid #00ffff;
  border-radius: 10px;
  color: #00ffff;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
  user-select: none;
  transition: all 0.1s;
}

.control-btn:active {
  background: rgba(0, 255, 255, 0.6);
  transform: scale(0.95);
}

.control-btn:hover {
  background: rgba(0, 255, 255, 0.5);
}

#shootBtn {
  background: rgba(255, 255, 0, 0.3);
  border-color: #ffff00;
  box-shadow: 0 0 15px rgba(255, 255, 0, 0.5);
}

#shootBtn:active {
  background: rgba(255, 255, 0, 0.6);
}

#shootBtn:hover {
  background: rgba(255, 255, 0, 0.5);
}