/* Accordion overview */

@layer application {
.chapter-accordion {
  display: flex;
  gap: clamp(1rem, calc(2 * var(--site-scale-unit)), 2rem);
  inline-size: 100%;
  block-size: 100%;
  min-block-size: 0;
  justify-self: start;
  opacity: 0;
  transition: opacity 420ms ease;
}

.route-stage.is-overview-revealed .chapter-accordion {
  opacity: 1;
}

.chapter-timeline-preview {
  display: grid;
  container-type: inline-size;
  min-inline-size: 0;
  block-size: 100%;
  min-block-size: 0;
  padding-block: clamp(1.25rem, calc(2.5 * var(--site-block-unit)), 2rem);
  opacity: 0;
  transform: translateX(clamp(2rem, calc(5 * var(--site-scale-unit)), 5rem));
  transition:
    opacity 680ms ease,
    transform 850ms var(--site-ease-out);
}

.route-stage.is-overview-aside-revealed .chapter-timeline-preview {
  opacity: 1;
  transform: translateX(0);
}

.chapter-timeline-preview__track {
  position: relative;
  min-block-size: 0;
  block-size: 100%;
}

.chapter-timeline-preview__path {
  position: absolute;
  z-index: 0;
  inset-block: 0;
  inset-inline-start: 0;
  inline-size: 100%;
  block-size: 100%;
  overflow: visible;
  /* Static counterpart of the main timeline's SVG neumorphism filter. */
  filter:
    drop-shadow(10px 12px 8px rgb(150 153 156 / 0.78))
    drop-shadow(-8px -9px 7px rgb(255 255 255 / 1))
    drop-shadow(4px 5px 2.8px rgb(159 162 165 / 0.72));
  pointer-events: none;
}

.chapter-timeline-preview__entries {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: repeat(var(--chapter-timeline-entry-count), minmax(0, 1fr));
  min-block-size: 0;
  block-size: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chapter-timeline-preview__entry {
  --chapter-timeline-card-gap: clamp(0.6rem, calc(0.9 * var(--site-scale-unit)), 0.95rem);
  --timeline-entry-fade-duration: 210ms;
  --timeline-entry-move-duration: 260ms;

  display: grid;
  grid-template-columns: minmax(0, 0.34fr) minmax(0, 0.66fr);
  align-items: center;
  min-block-size: 0;
}

.chapter-timeline-preview__entry:nth-child(even) {
  grid-template-columns: minmax(0, 0.66fr) minmax(0, 0.34fr);
}

.chapter-timeline-preview__marker {
  justify-self: center;
  cursor: pointer;
  text-decoration: none;
  transition:
    box-shadow 240ms var(--site-ease-out),
    transform 280ms var(--site-ease-spring);
}

.chapter-timeline-preview__entry:is(
  :hover,
  :focus-within,
  .is-accordion-highlighted
)
  .chapter-timeline-preview__marker {
  box-shadow:
    0.58rem 0.58rem 1.1rem rgb(95 95 95 / 0.36),
    -0.42rem -0.42rem 1rem rgb(255 255 255 / 0.9),
    inset 0 1px 0 rgb(255 255 255 / 0.38);
  outline: none;
  transform: scale(1.08);
}

.chapter-timeline-preview__entry:nth-child(even)
  .chapter-timeline-preview__marker {
  grid-row: 1;
  grid-column: 2;
}

.chapter-timeline-preview__card {
  min-inline-size: 0;
  min-block-size: 0;
  margin-inline-start: var(--chapter-timeline-card-gap);
  cursor: pointer;
  transition:
    box-shadow 240ms var(--site-ease-out),
    transform 280ms var(--site-ease-out);
}

.chapter-timeline-preview__entry:is(
  :hover,
  :focus-within,
  .is-accordion-highlighted
)
  .chapter-timeline-preview__card {
  box-shadow:
    0.7rem 0.7rem 1.4rem rgb(183 183 183 / 0.82),
    -0.6rem -0.6rem 1.3rem rgb(255 255 255 / 0.94);
  outline: none;
  transform: translateY(-0.16rem);
}

.chapter-timeline-preview__marker:focus-visible,
.chapter-timeline-preview__card:focus-visible {
  outline: 2px solid var(--timeline-accent);
  outline-offset: 3px;
}

.chapter-timeline-preview__entry:nth-child(even)
  .chapter-timeline-preview__card {
  grid-row: 1;
  grid-column: 1;
  margin-inline: 0 var(--chapter-timeline-card-gap);
}

.chapter-timeline-preview__card::before {
  position: absolute;
  z-index: 1;
  inset-block-start: 50%;
  inset-inline-start: -0.48rem;
  inline-size: 0.9rem;
  block-size: 0.9rem;
  border-block-end: var(--timeline-card-border-width) solid
    var(--timeline-card-border-color);
  border-inline-start: var(--timeline-card-border-width) solid
    var(--timeline-card-border-color);
  background: var(--timeline-card-surface);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.chapter-timeline-preview__entry:nth-child(even)
  .chapter-timeline-preview__card::before {
  inset-inline: auto -0.48rem;
  border: 0;
  border-block-start: var(--timeline-card-border-width) solid
    var(--timeline-card-border-color);
  border-inline-end: var(--timeline-card-border-width) solid
    var(--timeline-card-border-color);
}

.chapter-timeline-preview__card .timeline__title {
  display: -webkit-box;
  margin-block-start: 0;
  font-size: var(--type-size-accordion-timeline-card);
  white-space: normal;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  overflow-wrap: anywhere;
}

.chapter-timeline-preview__title-line {
  display: block;
}

.chapter-timeline-preview__subtitle {
  display: -webkit-box;
  overflow: hidden;
  hyphens: auto;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  line-clamp: 2;
}

@container (max-width: 13rem) {
  .chapter-timeline-preview__subtitle {
    font-size: var(--type-size-accordion-timeline-card-compact);
    -webkit-line-clamp: 3;
    line-clamp: 3;
  }
}

.chapter-accordion__item {
  position: relative;
  container-type: inline-size;
  flex: 1 1 0;
  min-inline-size: 0;
  block-size: 92%;
  align-self: center;
  overflow: visible;
  border: 1px solid var(--site-surface);
  border-radius: 0.75rem;
  background: var(--site-surface);
  box-shadow:
    calc(10px * var(--accordion-reveal))
    calc(10px * var(--accordion-reveal))
    calc(22px * var(--accordion-reveal))
    rgb(197 197 197 / var(--accordion-reveal)),
    calc(-10px * var(--accordion-reveal))
    calc(-10px * var(--accordion-reveal))
    calc(22px * var(--accordion-reveal))
    rgb(255 255 255 / var(--accordion-reveal));
  transition:
    flex-basis 420ms var(--site-ease-spring),
    flex-grow 420ms var(--site-ease-spring),
    block-size 420ms var(--site-ease-spring),
    box-shadow 300ms ease;
}

.chapter-accordion__item.is-active {
  flex: 0 0 var(--chapter-overview-block-size);
  block-size: 100%;
  aspect-ratio: 1;
  box-shadow:
    calc(12px * var(--accordion-reveal))
    calc(12px * var(--accordion-reveal))
    calc(26px * var(--accordion-reveal))
    rgb(197 197 197 / var(--accordion-reveal)),
    calc(-12px * var(--accordion-reveal))
    calc(-12px * var(--accordion-reveal))
    calc(26px * var(--accordion-reveal))
    rgb(255 255 255 / var(--accordion-reveal));
}

.chapter-accordion:has(> .chapter-accordion__item:nth-child(3))
  > .chapter-accordion__item {
  min-inline-size: 8rem;
}

.chapter-accordion:has(> .chapter-accordion__item:nth-child(3))
  > .chapter-accordion__item.is-active {
  flex-shrink: 1;
  aspect-ratio: auto;
}

/* A single card has no neighboring accordion state and uses the full card area. */
.chapter-accordion > .chapter-accordion__item:only-child {
  flex: 1 1 100%;
  inline-size: 100%;
  block-size: 100%;
  aspect-ratio: auto;
}

.chapter-accordion__trigger {
  position: relative;
  z-index: 2;
  display: flex;
  inline-size: 100%;
  block-size: 100%;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(1.25rem, calc(2.5 * var(--site-scale-unit)), 2.5rem);
  border: 0;
  background: transparent;
  color: #111;
  cursor: pointer;
  font: inherit;
  text-align: start;
  opacity: var(--accordion-reveal);
  border-radius: inherit;
  overflow: hidden;
}

.chapter-accordion__trigger::before {
  position: absolute;
  z-index: 1;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgb(0 0 0 / 0.28) 0%,
    transparent 42%,
    rgb(0 0 0 / 0.78) 100%
  );
  content: "";
  pointer-events: none;
}

.experience-accordion__logo {
  position: absolute;
  z-index: 0;
  inset-block-start: 50%;
  inset-inline-start: 50%;
  display: block;
  max-block-size: 100%;
  object-fit: contain;
  transform: translate(-50%, -50%);
  transition:
    inset-block-start 420ms var(--site-ease-spring),
    transform 420ms var(--site-ease-spring);
  pointer-events: none;
  user-select: none;
}

.chapter-accordion__item:not(.is-active) > .card-protected-preview {
  grid-template-columns: minmax(1rem, 1fr) auto minmax(1rem, 1fr);
  inline-size: min(calc(100% - 1.25rem), 12rem);
  gap: 0.45rem;
  opacity: 0.9;
  visibility: visible;
  pointer-events: auto;
}

.chapter-accordion__item.is-active > .card-protected-preview {
  /* The protected-image hint belongs to the media zone above the copy zone. */
  inset-block-start: 42%;
  opacity: 1;
  visibility: visible;
  transition:
    opacity 260ms ease 440ms,
    visibility 0s linear 440ms;
}

.chapter-accordion__item:not(.is-active) > .card-protected-preview .card-protected-preview__label {
  max-inline-size: 100%;
  justify-self: center;
  font-size: var(--type-size-accordion-protected-label-compact);
  hyphens: auto;
  letter-spacing: 0.08em;
  overflow-wrap: anywhere;
}

@container (max-width: 10rem) {
  .chapter-accordion__item:not(.is-active) > .card-protected-preview {
    grid-template-columns: 1fr;
    inline-size: min(calc(100% - 1.25rem), 10rem);
  }

  .chapter-accordion__item:not(.is-active) > .card-protected-preview .card-protected-preview__line {
    display: none;
  }
}

.experience-accordion__logo--cover {
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
  max-block-size: none;
  object-fit: cover;
  transform: none;
}

.chapter-accordion__item.is-active .chapter-accordion__trigger::before {
  background: linear-gradient(
    180deg,
    rgb(0 0 0 / 0.18) 0%,
    transparent 30%,
    rgb(0 0 0 / 0.08) 42%,
    rgb(0 0 0 / 0.28) 56%,
    rgb(0 0 0 / 0.62) 74%,
    rgb(0 0 0 / 0.88) 100%
  );
}

.chapter-accordion__image {
  position: absolute;
  z-index: 0;
  inset: 0;
  display: block;
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
  transition: filter 420ms ease, opacity 420ms ease;
  pointer-events: none;
  user-select: none;
}

.chapter-accordion__item--image-contain-blur
  .chapter-accordion__image--backdrop {
  object-fit: cover;
  filter: blur(1.4rem) brightness(0.72) saturate(0.82);
  opacity: 0.9;
  transform: scale(1.12);
}

.chapter-accordion__item--image-contain-blur
  .chapter-accordion__image--foreground {
  object-fit: contain;
  object-position: center 36%;
  padding: clamp(0.8rem, calc(2 * var(--site-scale-unit)), 1.5rem);
  padding-block-end: clamp(5.5rem, 19%, 8rem);
}

.chapter-accordion__item:not(.is-active) .chapter-accordion__image {
  filter: grayscale(0.72) saturate(0.45) brightness(0.72);
  opacity: 0.7;
}

.chapter-accordion__item--image-contain-blur:not(.is-active)
  .chapter-accordion__image--backdrop {
  filter: blur(1.4rem) grayscale(0.72) saturate(0.45) brightness(0.58);
  opacity: 0.78;
}

.chapter-accordion__trigger:focus-visible {
  outline: 2px solid #111;
  outline-offset: -0.75rem;
}

.chapter-accordion__prototype-label {
  position: absolute;
  display: inline-flex;
  box-sizing: border-box;
  inline-size: 100%;
  align-items: center;
  justify-content: center;
  padding: 0.42rem 0.72rem;
  border: 1px solid rgb(255 255 255 / 0.82);
  border-radius: 0.45rem;
  color: rgb(255 255 255 / 0.82);
  font-size: var(--type-size-accordion-prototype-label);
  font-weight: var(--type-weight-light);
  letter-spacing: 0.06em;
  line-height: 1;
  opacity: 0;
  text-shadow: 0 1px 8px rgb(0 0 0 / 0.72);
  visibility: hidden;
  white-space: nowrap;
  transition: opacity 160ms ease, visibility 0s;
  pointer-events: none;
}

.chapter-accordion__item.is-active .chapter-accordion__prototype-label {
  position: static;
  opacity: 1;
  visibility: visible;
  transition: opacity 260ms ease 360ms, visibility 0s linear 360ms;
}

.chapter-accordion__heading {
  display: grid;
  inline-size: 100%;
  min-inline-size: 0;
  justify-items: center;
}

.chapter-accordion__item.is-active .chapter-accordion__heading {
  inline-size: fit-content;
  max-inline-size: 100%;
  gap: clamp(0.45rem, calc(0.8 * var(--site-block-unit)), 0.65rem);
  justify-self: center;
}

.chapter-accordion__copy {
  position: absolute;
  z-index: 2;
  inset-inline: clamp(1.25rem, calc(2.5 * var(--site-scale-unit)), 2.5rem);
  inset-block-end: clamp(1.25rem, calc(2.5 * var(--site-scale-unit)), 2.5rem);
  display: grid;
  align-self: flex-end;
  gap: 0;
  min-inline-size: 0;
  color: #fff;
  text-align: center;
}

.chapter-accordion__item:not(.is-active) .chapter-accordion__copy {
  inset-inline: auto;
  inset-inline-start: 50%;
  inline-size: calc(100% - clamp(1.25rem, calc(2 * var(--site-scale-unit)), 2rem));
  justify-items: center;
  transform: translateX(-50%);
}

.chapter-accordion__title {
  display: block;
  inline-size: 100%;
  font-family: var(--type-family-display);
  font-size: var(--type-size-accordion-title);
  font-weight: var(--type-weight-light);
  line-height: 1.15;
  opacity: 0.82;
  overflow-wrap: anywhere;
  text-align: center;
  text-wrap: balance;
  text-shadow: 0 2px 12px rgb(0 0 0 / 0.65);
  transition: font-size 100ms ease, opacity 180ms ease;
}

.chapter-accordion__item.is-active .chapter-accordion__copy {
  gap: clamp(0.65rem, calc(1.4 * var(--site-block-unit)), 1rem);
}

.chapter-accordion__item.is-active .chapter-accordion__title {
  font-size: var(--type-size-accordion-title-active);
  opacity: 1;
  text-align: center;
  transition:
    font-size 240ms ease 420ms,
    opacity 240ms ease 420ms;
}

.chapter-accordion__description {
  display: block;
  position: absolute;
  max-block-size: 9rem;
  max-inline-size: 38rem;
  overflow: hidden;
  margin-inline: auto;
  font-size: var(--type-size-accordion-description);
  font-weight: var(--type-weight-light);
  hyphens: auto;
  line-height: 1.5;
  opacity: 0;
  text-align: justify;
  text-align-last: center;
  visibility: hidden;
  transition: opacity 100ms ease, visibility 0s;
}

.chapter-accordion__item.is-active .chapter-accordion__description {
  position: static;
  opacity: 0.92;
  visibility: visible;
  transition: opacity 320ms ease 440ms, visibility 0s linear 440ms;
}

/* Responsive and accessibility adjustments */

@media (max-width: 75rem) {
  :is(.chapter-accordion, .chapter-overview__layout) {
    block-size: min(
      calc(81.6 * var(--site-block-unit)),
      45.6rem,
      var(--chapter-overview-available-block-size, 45.6rem)
    );
    min-block-size: min(
      33.6rem,
      var(--chapter-overview-available-block-size, 33.6rem)
    );
  }

  .chapter-accordion {
    flex-direction: column;
    inline-size: 100%;
    justify-self: center;
  }

  .chapter-overview__layout {
    display: block;
  }

  .chapter-overview__layout:not(.chapter-overview__layout--accordion-only)::after {
    display: none;
  }

  .chapter-timeline-preview {
    display: none;
  }

  .chapter-accordion__item.is-active {
    flex-basis: 0;
    flex-grow: 2;
    block-size: auto;
    aspect-ratio: auto;
  }

  .chapter-accordion__item {
    inline-size: 100%;
    block-size: auto;
    align-self: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chapter-accordion,
  .chapter-accordion__item,
  .chapter-timeline-preview__marker,
  .chapter-timeline-preview__card,
  .brainfuel-icon-gallery__item,
  .brainfuel-icon-gallery__icon,
  .brainfuel-icon-gallery__satellites,
  .brainfuel-icon-gallery__satellite,
  .brainfuel-icon-gallery__satellite svg,
  .brainfuel-icon-gallery__satellite-label {
    transition: none;
  }
}
}