body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f8f8f8;
  color: #333;
}

header {
  background: #333;
  color: #fff;
  padding: 15px;
  text-align: center;
}

nav a {
  color: #fff;
  margin: 0 10px;
  text-decoration: none;
}

main {
  max-width: 600px;
  margin: auto;
  padding: 20px;
}

.game-container {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

footer {
  text-align: center;
  padding: 10px;
  background: #eee;
  margin-top: 40px;
}

#winOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.8s ease;
}

#winOverlay.show {
  opacity: 1;
}

#winMessage {
  text-align: center;
  margin-top: 10px;
  font-weight: bold;
  color: #4caf50;
}

#winMessage {
  text-align: center;
  margin-top: 10px;
  font-weight: bold;
  color: #4caf50;
}

.powerupMessage {
  text-align: center;
  margin-top: 10px;
  font-weight: bold;
  color: #ffd700;
}

#gameCanvas {
  border: 4px solid #444;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
  border-radius: 8px;
}