html, 

 /* index.html */

  #indexBody {
    margin: 0;
    padding: 0;
    overflow: hidden;
    width: 100%;
    height: 100%;
    background: #000;
    font-family: Arial, sans-serif;
    touch-action: none;
  }

  #circleWipe {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: #000;
    pointer-events: none;
    clip-path: circle(0% at 50% 50%);
    transition: clip-path 1s ease-in-out;
    z-index: 20;
  }

   /* categories.html */
  #categoriesBody {
      margin: 0;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #fff; /* white background */
      font-family: Arial, sans-serif;
      overflow: hidden; /* prevent scrollbars */
    }

    /* Overlay for reverse circle wipe */
    #overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #000;
      clip-path: circle(100% at 50% 50%);
      z-index: 100;
    }


     /* Buttons */

    #buyButton {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    padding: 15px 30px;
    font-size: 20px;
    font-weight: bold;
    color: white;
    background-color: #1e90ff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.5);
    z-index: 10;
    transition: background-color 0.3s;
  }
  #buyButton:hover { background-color: #104e8b; }

    /* Buttons container */
    .button-container {
      position: absolute;
      display: flex;
      flex-direction: column;
      gap: 20px;
      align-items: center;
      z-index: 200; /* above 3D canvas */
      opacity: 0; /* hidden initially */
      transition: opacity 0.8s ease-in-out; /* smooth fade-in */
    }

    .btn {
      padding: 15px 40px;
      font-size: 20px;
      font-weight: bold;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      text-decoration: none;
      color: #fff;
      transition: transform 0.2s;
    }

    .btn:hover {
      transform: scale(1.05);
    }

    .btn-blue {
      background-color: #007BFF;
    }

    .btn-red {
      background-color: #FF4136;
    }