* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html, body {
    width: 100%;
    height: 100%;
    overflow: hidden; /* Prevent scrolling */
    background: #222; /* Dark background */
    font-family: sans-serif;
    color: #fff;
  }
  
  /* Screens */
  #titleScreen,
  #gameContainer,
  #gameOverScreen {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: none; 
    align-items: center;
    justify-content: center;
  }
  
  /* Title screen is shown by default */
  #titleScreen {
    display: flex;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.8);
  }
  
  /* Game Container */
  #gameContainer {
    position: relative;
  }
  
  /* Game Over Screen */
  #gameOverScreen {
    flex-direction: column;
    background: rgba(0, 0, 0, 0.8);
    text-align: center;
  }
  
  #gameCanvas {
    background-color: #444;
    display: block;
    width: 100%;
    height: 100%;
  }
  
  #scoreboard {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.2rem;
    display: flex;
    gap: 20px;
  }
  
  button {
    background-color: #0c9;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
    color: #000;
    border-radius: 5px;
    margin-top: 20px;
    transition: background 0.3s;
  }
  
  button:hover {
    background-color: #0bf;
  }