/* Experimental: progressive method figure, pinned to vertical scroll,
   with a left outline that toggles between steps */

#method {
  padding-bottom: 1.25rem;
}

#interactive-demo {
  padding-top: 1.25rem;
}

.exp-scrolly {
  position: relative;
  margin-top: 1.5rem;
}

.exp-scrolly-sticky {
  position: sticky;
  top: 24px;
  z-index: 2;
  background: #fff;
  padding-bottom: 1rem;
}

.exp-pinned-heading {
  margin-bottom: 1.5rem;
}

.exp-scrolly-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

.exp-outline {
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
  border-left: 2px solid #eaeaea;
  align-self: center;
}

.exp-outline-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  text-align: left;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  margin-left: -2px;
  padding: 0.1rem 0 0.1rem 1rem;
  cursor: pointer;
  color: #9a9a9a;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.exp-outline-item:hover {
  color: #4a4a4a;
}

.exp-outline-item.is-active {
  color: #1a1a1a;
  border-left-color: #3c5a99;
}

.exp-outline-index {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: #b7b7b7;
}

.exp-outline-item.is-active .exp-outline-index {
  color: #3c5a99;
}

.exp-outline-label {
  font-size: 1.15rem;
  line-height: 1.35;
  font-weight: 600;
}

.exp-flicker-wrap {
  position: relative;
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  aspect-ratio: 3696 / 1274;
  background: #fff;
  border-radius: 6px;
  overflow: hidden;
}

.exp-flicker-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  pointer-events: none;
}

.exp-flicker-img.is-active {
  opacity: 1;
}

.exp-text-block {
  max-width: 760px;
  margin: 1.3rem auto 0;
  text-align: left;
}

.exp-step-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: #1a1a1a;
}

.exp-step-text {
  font-size: 1rem;
  line-height: 1.6;
  color: #363636;
  text-align: justify;
  margin: 0;
}


.exp-scroll-track {
  position: relative;
  z-index: 1;
}

.exp-scroll-zone {
  min-height: 20px;
}

@media screen and (max-width: 768px) {
  .exp-scrolly-grid {
    grid-template-columns: 1fr;
  }

  .exp-outline {
    flex-direction: row;
    flex-wrap: wrap;
    border-left: none;
    border-bottom: 2px solid #eaeaea;
    padding: 0 0 0.6rem;
    gap: 0.5rem 1.2rem;
  }

  .exp-outline-item {
    border-left: none;
    border-bottom: 2px solid transparent;
    margin-left: 0;
    padding: 0 0 0.4rem;
  }

  .exp-outline-item.is-active {
    border-bottom-color: #3c5a99;
  }

  .exp-outline-label {
    font-size: 0.8rem;
  }
}