/* Body Styles */
body {
    margin: 0;
    height: 100vh;
    background-color: black;
    overflow: hidden;
    position: relative;
    z-index: 0; /* Background layer */
  }
  
  /* Watermark Styles */
  .watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-20deg);
    font-size: 100px;
    font-family: 'Times New Roman', Times, serif;
    color: rgba(255, 255, 255, 0.08); /* Transparent white */
    pointer-events: none;
    z-index: 1;
  }
  
  /* Footer Styles */
  .footer {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
      Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    font-weight: bold;
    position: fixed;
    bottom: 0;
    right: 0;
    padding: 10px;
    color: orangered;
    text-align: right;
    z-index: 3;
  }
  
  /* Centered Container */
  .center-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    z-index: 2;
  }
  
  /* Heading */
  h2.title {
    margin-top: 0;
    color: lime;
    font-size: 28px;
    text-align: center;
  }
  
  /* Score Board */
  .score-board {
    font-size: 22px;
    font-weight: 900;
    color: lime;
    text-align: center;
    margin-bottom: 10px;
  }
  
  /* Grid Container */
  .grid-container {
    display: grid;
    grid-template-columns: repeat(2, 150px);
    grid-template-rows: repeat(2, 150px);
    gap: 20px;
  }
  
  /* Game Buttons */
  .grid-button {
    width: 150px;
    height: 150px;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s ease;
  }
  
  .grid-button:active {
    transform: scale(0.9);
  }
  
  /* Button Colors */
  .green {
    background-color: #4caf50;
  }
  
  .red {
    background-color: #f44336;
  }
  
  .yellow {
    background-color: #ffeb3b;
  }
  
  .blue {
    background-color: #2196f3;
  }
  
  /* Button Hover */
  .grid-button:hover {
    opacity: 0.8;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }
  
  /* Button Active State */
  .grid-button.active {
    transform: scale(1.05);
    opacity: 1;
  }
  
  /* Start Button */
  button {
    padding: 10px 20px;
    font-size: 18px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    background-color: #ff5733;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    align-self: center;
  }
  
  button:hover {
    background-color: #ff7043;
    transform: scale(1.1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }
  
  /* Floating Icon */
  span {
    background: url("https://cdn4.iconfinder.com/data/icons/general-office/91/General_Office_54-512.png");
    width: 100px;
    height: 100px;
    position: absolute;
    pointer-events: none;
    background-size: cover;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    animation: animate 6s linear;
    z-index: 2;
  }
  
  @keyframes animate {
    0% {
      transform: translate(-50%, -50%);
      opacity: 1;
      filter: hue-rotate(0deg);
    }
  
    100% {
      transform: translate(-50%, -5000%);
      opacity: 0;
      filter: hue-rotate(720deg);
    }
  }