#intro-scroll-section {
    height: 250vh;
    position: relative;
  }

  #default-img-app {
    transition: opacity 0.2s;
    opacity: 0;
    width: 0px;
  }

  #intro-sticky-container {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-y: hidden;
    overflow-x: hidden;
    backface-visibility: visible;
  }

  #intro-image-wrapper {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    transform-origin: center;
    will-change: transform;
    contain: inline-size;
    overflow: clip;
    width: 100vw;
  }

  #intro-image {
    object-fit: cover;
    backface-visibility: hidden;
    overflow: hidden;
    justify-self: center;
  }

  .section-title {
    font-size: 2.5rem;
    font-weight: bold;
    color: #333;
  }

  .section-description {
    font-size: 1.25rem;
    color: #555;
    margin-bottom: 1rem;
  }

  .sticky-header-content {
    top: 115px;
    z-index: 10;
    background: transparent;
  }

  .sticky-phone-container {
    position: -webkit-sticky;
    position: sticky;
    transform: translate(0%, -50%);
    top: 50%;
    align-self: flex-start;
    overflow: hidden;
    z-index: 9;
    margin-bottom: -200px;
  }

  .mockup-phone {
    height: auto;
    display: block;
    justify-self: center;
  }

  .mockup-phone,
  .mockup-phone-overlay {
    display: block;
    height: auto;
  }

  .mockup-phone {
    z-index: 0;
    position: relative;
  }


  #card-stack {
    top: 29vh;
    z-index: 8;
    padding-top: 22vh;
    padding-bottom: 30vh;
  }

  .feature-card {
    background-color: #ffffff;
    border: 1px solid #e9ecef;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.07);
    border-radius: 28px;
    transition: transform 0.5s ease, opacity 0.2s ease;
    position: relative;
    background: #f1f1f1;
    margin-bottom: 50px;
  }

  .feature-card .card-img {
    border-radius: 28px 0px 0px 28px;
    object-fit: cover;
    height: 100%;
  }

  .feature-card.is-visible {
    opacity: 1;
    transform: translateY(0);
    z-index: 20;
  }

  .feature-card.is-past {
    position: sticky;
    top: 30vh;
    z-index: 1;
    transform: scale(0.95);
  }

  .feature-card.is-past:not(:last-of-type) {
    transform: scale(0.95);
  }

  #cards-scroll-section {
    margin-top: -60vh;
  }

  @media (max-width: 991.98px) {


    .feature-card.is-past {
      top: 10vh;
    }

    #cards-scroll-section {
      margin-top: -55vh;
    }

    .sticky-phone-container {
      position: relative;
      padding-bottom: 20px;
    }

    .sticky-header-content,
    #card-stack {
      position: static;
      background-color: transparent;
      max-height: none;
      overflow-y: visible;
      margin-top: 0;
      padding-top: 0;
      z-index: auto;
    }

    #card-stack {
      margin-top: 1.5rem;
      padding-right: 0;
    padding-top: 10vh;
    }

    .section-description {
      margin-bottom: 0;
    }

    .feature-card+.feature-card {
      margin-top: 1rem;
    }

    #default-img-app {
      /*transition: opacity 0.2s;*/
      opacity: 0;
      width: auto;
      justify-items: center;
      margin: 0 auto;
    }

  }

  @media (max-width: 767px) {
    .feature-card .card-img {
      border-radius: 28px 28px 0px 0px;
      object-fit: cover;
      height: 100%;
    }
  }

  .mockup-phone-wrapper {
    position: relative;

  }

  .mockup-phone-overlay {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    /*transition: opacity 0.2s ease;*/
    pointer-events: none;
    z-index: 1;
    width: 0px;
  }

  .card.feature-card.last-card.is-past {
    opacity: 1;
    transform: none;
  }

  .overlay-container {
    position: relative;
    display: inline-block;
  }

  .overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    pointer-events: none;
    text-align: center;
  }

  .overlay-text {
    font-size: 3.5rem;
    padding: 1rem;
    font-weight: 800;
  }