.about-timeline-section {
  --timeline-progress: 0;
  position: relative;
  min-height: 800vh;
  padding: 150px 0 0;
  overflow: clip;
}

.about-timeline-intro {
  position: relative;
  z-index: 2;
}

.about-timeline-sticky {
  position: sticky;
  top: var(--nav-h);
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 48px 0 108px;
  overflow: hidden;
}

.about-timeline-viewport {
  width: 100%;
  overflow: visible;
}

.about-timeline-track {
  --timeline-shift: 0px;
  position: relative;
  display: flex;
  width: max-content;
  gap: clamp(28px, 4vw, 72px);
  align-items: stretch;
  padding: 0 max(64px, calc((100vw - var(--container)) / 2 + 64px));
  transform: translate3d(var(--timeline-shift), 0, 0);
  transition: transform 80ms linear;
  will-change: transform;
}

.about-timeline-card {
  position: relative;
  flex: 0 0 clamp(320px, 37vw, 540px);
  min-height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-top: 1px solid rgba(18, 42, 68, 0.16);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.38), rgba(255, 255, 255, 0.08)),
    rgba(250, 250, 247, 0.66);
  padding: 44px;
  opacity: 0.32;
  transform: scale(0.9);
  transition:
    opacity 420ms var(--ease-standard),
    transform 520ms var(--ease-out),
    border-color 320ms var(--ease-standard),
    background 420ms var(--ease-standard);
}

.about-timeline-card.has-photo {
  justify-content: flex-start;
  min-height: 560px;
  padding-top: 32px;
}

.about-timeline-card::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 44px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--c-brand);
  border-radius: 999px;
  background: var(--c-cream);
  box-shadow: 0 0 0 8px rgba(250, 250, 247, 0.88);
  transition:
    background 320ms var(--ease-standard),
    border-color 320ms var(--ease-standard),
    transform 420ms var(--ease-out);
}

.about-timeline-card.is-active {
  border-color: var(--c-brand);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.28)),
    rgba(250, 250, 247, 0.94);
  opacity: 1;
  transform: scale(1);
}

.about-timeline-card.is-active::before {
  border-color: var(--c-silver);
  background: var(--c-silver);
  transform: scale(1.28);
}

/* ── Photo frame ── */
.about-timeline-photo {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  margin: 0 0 28px;
  overflow: hidden;
  /* mat + thin frame + shadow */
  box-shadow:
    0 0 0 8px rgba(250, 250, 247, 0.96),
    0 0 0 9px rgba(18, 42, 68, 0.12),
    0 12px 40px rgba(18, 42, 68, 0.14);
  flex-shrink: 0;
}

.about-timeline-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.04);
  transition: transform 700ms var(--ease-out);
}

.about-timeline-card.is-active .about-timeline-photo img {
  transform: scale(1);
}

.about-timeline-brand {
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-timeline-brand img {
  width: 65%;
  height: auto;
  object-fit: contain;
  transform: scale(0.92);
  transition: transform 700ms var(--ease-out), opacity 420ms var(--ease-standard);
  opacity: 0.72;
}

.about-timeline-card.is-active .about-timeline-brand img {
  transform: scale(1);
  opacity: 1;
}

/* ── Rail of thumbnails ── */
.about-timeline-rail {
  position: absolute;
  bottom: 28px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  pointer-events: none;
}

.about-timeline-rail-track {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.about-timeline-rail-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  opacity: 0.35;
  transition:
    opacity 380ms var(--ease-standard),
    transform 380ms var(--ease-out);
}

.about-timeline-rail-thumb.is-active {
  opacity: 1;
  transform: translateY(-4px);
}

.about-timeline-rail-thumb img {
  width: 52px;
  height: 38px;
  object-fit: cover;
  display: block;
  box-shadow:
    0 0 0 3px rgba(250, 250, 247, 0.9),
    0 0 0 4px rgba(18, 42, 68, 0.14),
    0 3px 10px rgba(18, 42, 68, 0.12);
}

.about-timeline-rail-thumb span {
  font-family: var(--font-serif);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--c-brand);
  line-height: 1;
}

/* ── Year label ── */
.about-timeline-year {
  display: block;
  margin-bottom: 26px;
  color: var(--c-brand);
  font-family: var(--font-serif);
  font-size: clamp(72px, 8vw, 126px);
  font-weight: 300;
  line-height: 0.9;
  letter-spacing: 0;
}

.about-timeline-card.has-photo .about-timeline-year {
  font-size: clamp(52px, 6vw, 88px);
  margin-bottom: 16px;
}

.about-timeline-card p {
  max-width: 430px;
  margin: 0;
  color: var(--c-gray-700);
  font-size: 17px;
  line-height: 1.65;
}

.about-timeline-card.is-active p {
  color: var(--c-text);
}

@media (max-width: 920px) {
  .about-timeline-section {
    min-height: auto;
    padding: 96px 0;
  }

  .about-timeline-sticky {
    position: relative;
    top: auto;
    min-height: 0;
    display: block;
    padding: 0;
  }

  .about-timeline-track {
    width: auto;
    display: grid;
    gap: 28px;
    padding: 0 32px;
    transform: none !important;
  }

  .about-timeline-card,
  .about-timeline-card.is-active {
    min-height: 0;
    transform: none;
    opacity: 1;
    padding: 34px 28px;
  }

  .about-timeline-card.has-photo,
  .about-timeline-card.has-photo.is-active {
    justify-content: flex-start;
    padding-top: 28px;
  }

  .about-timeline-photo {
    box-shadow:
      0 0 0 6px rgba(250, 250, 247, 0.96),
      0 0 0 7px rgba(18, 42, 68, 0.12),
      0 6px 20px rgba(18, 42, 68, 0.12);
  }

  .about-timeline-photo img {
    transform: none;
  }

  .about-timeline-year {
    font-size: 58px;
  }

  .about-timeline-rail {
    display: none;
  }
}

@media (max-width: 560px) {
  .about-timeline-track {
    padding: 0 24px;
  }

  .about-timeline-card,
  .about-timeline-card.is-active {
    padding: 30px 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-timeline-section {
    min-height: auto;
  }

  .about-timeline-sticky {
    position: relative;
    top: auto;
  }

  .about-timeline-track {
    width: auto;
    display: grid;
    transform: none !important;
  }

  .about-timeline-card {
    opacity: 1;
    transform: none;
  }
}

.hero .hero__text {
  max-width: 720px;
}

.hero .display {
  font-size: 64px;
}

@media (max-width: 900px) {
  .hero .display {
    font-size: 48px;
  }
}