body {
    --s: 25vmin;
    --p: calc(var(--s) / 2);
    --c1: pink;
    --c2: dodgerblue;
    --c3: white;
    --bg: var(--c3);
    --d: 8000ms;
    --e: cubic-bezier(0.76, 0, 0.24, 1);
  
    background-color: var(--bg);
    background-image:
      linear-gradient(45deg, var(--c1) 25%, transparent 25%),
      linear-gradient(-45deg, var(--c1) 25%, transparent 25%),
      linear-gradient(45deg, transparent 75%, var(--c2) 75%),
      linear-gradient(-45deg, transparent 75%, var(--c2) 75%);
    background-size: var(--s) var(--s);
    background-position: 
      calc(var(--p) *  1) calc(var(--p) *  0), 
      calc(var(--p) * -1) calc(var(--p) *  1), 
      calc(var(--p) *  1) calc(var(--p) * -1), 
      calc(var(--p) * -1) calc(var(--p) *  0);
    animation: 
      color var(--d) var(--e) infinite,
      position var(--d) var(--e) infinite;
  }
  
  @keyframes color {
    0%, 25% {
      --bg: var(--c3);
    }
    26%, 50% {
      --bg: var(--c1);
    }
    51%, 75% {
      --bg: var(--c3);
    }
    76%, 100% {
      --bg: var(--c2);
    }
  }
  
  @keyframes position {
    0% {
      background-position: 
        calc(var(--p) *  1) calc(var(--p) *  0), 
        calc(var(--p) * -1) calc(var(--p) *  1), 
        calc(var(--p) *  1) calc(var(--p) * -1), 
        calc(var(--p) * -1) calc(var(--p) *  0);
    }
    25% {
      background-position: 
        calc(var(--p) *  1) calc(var(--p) *  4), 
        calc(var(--p) * -1) calc(var(--p) *  5), 
        calc(var(--p) *  1) calc(var(--p) *  3), 
        calc(var(--p) * -1) calc(var(--p) *  4);
    }
    50% {
      background-position: 
        calc(var(--p) *  3) calc(var(--p) * 8), 
        calc(var(--p) * -3) calc(var(--p) * 9), 
        calc(var(--p) *  2) calc(var(--p) * 7), 
        calc(var(--p) * -2) calc(var(--p) * 8);
    }
    75% {
      background-position: 
        calc(var(--p) *  3) calc(var(--p) * 12), 
        calc(var(--p) * -3) calc(var(--p) * 13), 
        calc(var(--p) *  2) calc(var(--p) * 11), 
        calc(var(--p) * -2) calc(var(--p) * 12);
    }
    100% {    
      background-position: 
        calc(var(--p) *  5) calc(var(--p) * 16), 
        calc(var(--p) * -5) calc(var(--p) * 17), 
        calc(var(--p) *  5) calc(var(--p) * 15), 
        calc(var(--p) * -5) calc(var(--p) * 16);
    }
  }
  
  @media (prefers-reduced-motion) {
    body {
      animation: none;
    }
  }
  
  @keyframes stop {
    0%, 25% {
      animation-play-state: running;
    }
    26%, 50% {
      animation-play-state: paused;
    }
    51%, 75% {
      animation-play-state: running;
    }
    76%, 100% {
      animation-play-state: paused;
    }
  }
  
  body {
    overflow: hidden;
  }
  

  body {
    font-family: 'Sora', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

#game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#game-board {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #000000;
    background-color: #222;
}

.cell {
    width: 20px;
    height: 20px;
    position: absolute;
    background-color: #222;
}

.snake {
    background-image: url('block.png');
    background-size: cover;
}

.food {
    background-color: #d9534f;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    background-color: #8f1515;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background-color: #b30000;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.overlay.active {
    visibility: visible;
    opacity: 1;
}

.popup {
  background-color: #fff;
  padding: 5px;
  border-radius: 4px;
  text-align: center;
  opacity: 0;
  transform: scale(0.7);
  transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
}

.popup img {
  margin-bottom: 5px;
}

.popup h2 {
  margin-bottom: 5px;
}

.popup button {
  margin-top: 5px;
}

.overlay.active .popup {
    opacity: 1;
    transform: scale(1);
}

.countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: #000;
    opacity: 0;
    animation: fadeSlideUp 1s ease-in-out forwards;
}

@keyframes fadeSlideUp {
    0% {
        opacity: 0;
        transform: translateY(50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}