/* Dynamic CSS with animations and responsiveness */
:root {
  --primary-color: #4CAF50;
  --secondary-color: #FF5722;
  --background-color: #87CEEB;
  --text-color: #000;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, var(--background-color), #98D8E8);
  font-family: 'Arial', sans-serif;
  transition: background 0.3s ease;
}

#game-container {
  position: relative;
  text-align: center;
  max-width: 90vw;
  animation: fadeIn 1s ease-in;
}

#game-canvas {
  border: 3px solid var(--primary-color);
  background-color: #fff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.3s ease;
}

#game-canvas:hover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

#score {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 1.5rem;
  color: var(--text-color);
  background: rgba(255, 255, 255, 0.9);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  animation: pulse 2s infinite;
}

#game-over {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.9);
  color: #fff;
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
  animation: slideIn 0.5s ease-out;
}

#restart-btn {
  padding: 0.75rem 1.5rem;
  font-size: 1.125rem;
  cursor: pointer;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 0.5rem;
  transition: background 0.3s ease, transform 0.2s ease;
}

#restart-btn:hover {
  background: var(--secondary-color);
  transform: scale(1.05);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes slideIn {
  from { transform: translate(-50%, -60%); opacity: 0; }
  to { transform: translate(-50%, -50%); opacity: 1; }
}

/* Responsive design */
@media (max-width: 768px) {
  #game-canvas {
    width: 100%;
    height: auto;
  }
  #score {
    font-size: 1.25rem;
  }
  #game-over {
    padding: 1rem;
  }
}