.diagnostic-intro-scroll__track {
  --scroll-progress: 1;
  --scroll-progress-headline: var(--scroll-progress);
  --diagnostic-intro-offset-rise: 1.5rem;
  --diagnostic-intro-what-threshold: 0.62;
  --diagnostic-intro-button-delay: 0.2s;
  --diagnostic-intro-what-grid-duration: 1s;
  --diagnostic-intro-what-duration: 1s;
  --diagnostic-intro-what-delay: 0.12s;
  --diagnostic-intro-what-ease: cubic-bezier(0.33, 1, 0.68, 1);

  height: 120svh;
  position: relative;
}

.diagnostic-intro-scroll__stage {
  position: sticky;
  top: 0;
  height: 100svh;
  overflow-x: clip;
  overflow-y: visible;
  background-color: var(--color-warm);
}

.diagnostic-intro-scroll__stage .diagnostic-intro {
  position: relative;
  z-index: 1;
  min-height: 100svh;
}

.diagnostic-intro-scroll__stage .diagnostic-intro__inner {
  z-index: 2;
  min-height: 100svh;
}

.diagnostic-intro-scroll__stage
  .diagnostic-intro__title-line:not(.diagnostic-intro__title-line--offset),
.diagnostic-intro-scroll__stage .diagnostic-intro__title-rest {
  opacity: var(--scroll-progress-headline);
  transform: translateY(
    calc((1 - var(--scroll-progress-headline)) * var(--motion-reveal-distance, 1.5rem))
  );
  will-change: transform, opacity;
}

.diagnostic-intro-scroll__stage .diagnostic-intro__title-phrase {
  opacity: 1;
  transform: none;
}

.diagnostic-intro-scroll__stage .btn {
  opacity: 0;
  pointer-events: none;
}

.diagnostic-intro-scroll__track.is-button-visible .diagnostic-intro-scroll__stage .btn {
  opacity: 1;
  pointer-events: auto;
  animation: diagnostic-intro-btn-in var(--motion-reveal-duration) var(--motion-reveal-ease)
    var(--diagnostic-intro-button-delay) both;
}

@keyframes diagnostic-intro-btn-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.diagnostic-intro-scroll__stage .diagnostic-intro__title-what-inner {
  opacity: 0;
  transform: translate3d(0, var(--diagnostic-intro-offset-rise), 0);
  backface-visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--diagnostic-intro-what-duration) var(--diagnostic-intro-what-ease)
      var(--diagnostic-intro-what-delay),
    transform var(--diagnostic-intro-what-duration) var(--diagnostic-intro-what-ease)
      var(--diagnostic-intro-what-delay);
  will-change: transform, opacity;
}

.diagnostic-intro-scroll__track.is-what-visible .diagnostic-intro__title-what-inner {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (max-width: 1024px) {
  .diagnostic-intro-scroll__track {
    --diagnostic-intro-what-threshold: 0.3;
    height: 108svh;
  }

  .diagnostic-intro-scroll__stage {
    height: 88svh;
  }

  .diagnostic-intro-scroll__stage .diagnostic-intro {
    min-height: 88svh;
  }

  .diagnostic-intro-scroll__stage .diagnostic-intro__inner {
    min-height: 88svh;
  }

  .diagnostic-intro-scroll__stage
    .diagnostic-intro__title-line:not(.diagnostic-intro__title-line--offset),
  .diagnostic-intro-scroll__stage .diagnostic-intro__title-rest {
    opacity: 1;
    transform: none;
    will-change: auto;
  }

  .diagnostic-intro-scroll__stage .btn {
    opacity: 1;
    pointer-events: auto;
    animation: none;
  }
}

@media (max-width: 767px) {
  .diagnostic-intro-scroll__track {
    --diagnostic-intro-what-threshold: 0.2;
    height: 102svh;
  }

  .diagnostic-intro-scroll__stage {
    height: 85svh;
  }

  .diagnostic-intro-scroll__stage .diagnostic-intro {
    min-height: 85svh;
  }

  .diagnostic-intro-scroll__stage .diagnostic-intro__inner {
    min-height: 85svh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .diagnostic-intro-scroll__track {
    height: auto;
  }

  .diagnostic-intro-scroll__stage {
    position: relative;
    height: auto;
    min-height: 100svh;
  }

  .diagnostic-intro-scroll__stage
    .diagnostic-intro__title-line:not(.diagnostic-intro__title-line--offset),
  .diagnostic-intro-scroll__stage .diagnostic-intro__title-rest,
  .diagnostic-intro-scroll__stage .diagnostic-intro__title-what-inner,
  .diagnostic-intro-scroll__stage .btn {
    opacity: 1;
    transform: none;
    transition: none;
    pointer-events: auto;
  }

  .diagnostic-intro-scroll__track.is-button-visible .diagnostic-intro-scroll__stage .btn {
    opacity: 1;
    animation: none;
  }

  .diagnostic-intro-scroll__track.is-what-visible .diagnostic-intro__title-phrase,
  .diagnostic-intro-scroll__track .diagnostic-intro__title-phrase {
    grid-template-columns: 1fr auto;
  }
}