/* Overlay background */
    #popupOverlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0, 0, 0, 0.5);
      display: none; /* hidden initially */
      justify-content: center;
      align-items: center;
      z-index: 9999;
    }

    /* Popup container */
    #popup {
      position: relative;
      background: white;
      padding: 20px 30px;
      border-radius: 8px;
      max-width: 400px;
      width: 90%;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
      text-align: center;
      font-family: Arial, sans-serif;
    }

    /* Close button - hidden initially */
    #closeBtn {
      position: absolute;
      top: 10px;
      right: 15px;
      font-size: 28px;
      font-weight: bold;
      cursor: pointer;
      display: none;
      user-select: none;
    }

    /* Image slider container */
    #imageSlider {
      position: relative;
      width: 100%;
      overflow: hidden;
      border-radius: 6px;
      margin-bottom: 15px;
    }

    /* Slider images */
    #imageSlider img {
      width: 100%;
      object-fit: cover;
      position: absolute;
      top: 0;
      left: 0;
      opacity: 0;
      transition: opacity 0.6s ease-in-out;
    }

    /* Active slide visible */
    #imageSlider img.active {
      opacity: 1;
      position: relative;
    }

    /* Countdown text */
    #countdownText {
      font-size: 14px;
      color: #555;
    }