/* Main-page chapter navigation, replacing the floating top header. */
html {
  scroll-padding-top: 24px;
}

.case-study-page .section {
  scroll-margin-top: 24px;
}

.case-study-page .hero {
  padding-top: 48px;
}

.case-study-page .chapter-rail {
  --chapter-progress: 0;
  position: fixed;
  z-index: 20;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  display: grid;
  gap: 11.5px;
  width: 163.3px;
  padding: 13.8px 11.5px;
  border: 1px solid #d1d5dc;
  border-radius: 18.4px;
  background: transparent;
  box-shadow: none;
}

.case-study-page .chapter-rail::before,
.case-study-page .chapter-rail::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: 39.1px;
  bottom: 39.1px;
  right: 23px;
  width: 4.6px;
  border-radius: 999px;
  background: #b5bcc6;
  pointer-events: none;
}

.case-study-page .chapter-rail::after {
  background: var(--navy);
  transform: scaleY(var(--chapter-progress));
  transform-origin: top;
}

.case-study-page .chapter-link {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 27.6px;
  align-items: center;
  justify-items: center;
  gap: 9.2px;
  width: 100%;
  height: 50.6px;
  border-radius: 9.2px;
  text-decoration: none;
}

.case-study-page .chapter-dot {
  width: 11.5px;
  height: 11.5px;
  border-radius: 50%;
  background: #858e9a;
  box-shadow: 0 0 0 3px var(--paper);
}

.case-study-page .chapter-link[data-complete] .chapter-dot {
  background: var(--navy);
}

.case-study-page .chapter-link[aria-current] .chapter-dot {
  background: var(--navy);
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px rgba(16, 43, 99, .18);
}

.case-study-page .chapter-label {
  justify-self: end;
  color: #666d78;
  font-size: 14.375px;
  font-weight: 700;
  line-height: 1.5;
  white-space: nowrap;
}

.case-study-page .chapter-link[aria-current] .chapter-label {
  color: var(--navy);
  font-weight: 800;
}

@media (max-width: 1200px) {
  .case-study-page .chapter-rail {
    right: 10px;
    width: 128.8px;
    padding: 9.2px 6.9px;
  }

  .case-study-page .chapter-rail::before,
  .case-study-page .chapter-rail::after {
    top: 34.5px;
    bottom: 34.5px;
    right: 14.95px;
  }

  .case-study-page .chapter-link {
    grid-template-columns: minmax(0, 1fr) 20.7px;
    gap: 4.6px;
  }

  .case-study-page .chapter-label {
    font-size: 12.65px;
  }

  .case-study-page .section,
  .case-study-page .hero,
  .case-study-page .case-study-footer {
    padding-right: 154px;
  }
}

@media (max-width: 700px) {
  .case-study-page .chapter-rail {
    right: 4px;
    width: 110.4px;
    gap: 9.2px;
  }

  .case-study-page .chapter-label {
    font-size: 12.075px;
  }

  /* Keep the enlarged labels and touch targets clear of the content. */
  .case-study-page .section,
  .case-study-page .hero,
  .case-study-page .case-study-footer {
    padding-right: 128px;
  }

  .case-study-page .hero {
    padding-top: 32px;
  }
}

@media (max-height: 320px) {
  .case-study-page .chapter-rail {
    gap: 4px;
    padding-block: 8px;
    max-height: calc(100svh - 16px);
    overflow-y: auto;
  }

  .case-study-page .chapter-link {
    height: 44px;
  }

  .case-study-page .chapter-rail::before,
  .case-study-page .chapter-rail::after {
    top: 30px;
    bottom: 30px;
  }
}