.page-about {
  --ab-muted: #A8B7B5;
  --ab-radius: 2px;
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(32px, 7vh, 76px)) 0 clamp(56px, 9vh, 104px);
  background:
    radial-gradient(90% 70% at 88% 6%, rgba(0, 230, 195, 0.12), transparent 62%),
    radial-gradient(70% 60% at 0% 100%, rgba(42, 42, 92, 0.38), transparent 72%),
    var(--ink);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.22;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .ab-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin: 0 0 clamp(22px, 4vh, 40px);
}

.page-about .ab-hero-inner {
  display: grid;
  gap: clamp(30px, 4vw, 48px);
  align-items: end;
}

.page-about .ab-hero-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(33px, 6.2vw, 74px);
  line-height: 1.03;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .ab-hero-lede {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--white);
}

.page-about .ab-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin-top: clamp(26px, 4vh, 44px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .ab-fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .ab-fact-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(21px, 2.8vw, 30px);
  font-weight: 500;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-fact-label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grey);
}

.page-about .ab-hero-visual {
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(18, 38, 31, 0.6);
  padding: clamp(14px, 1.8vw, 20px);
}

.page-about .ab-visual-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .ab-coord-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- Section basics ---------- */
.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.2vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.008em;
  color: var(--white);
}

.page-about .ab-intro {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ab-muted);
}

/* ---------- Timeline ---------- */
.page-about .ab-timeline-grid {
  margin-top: clamp(34px, 5vh, 62px);
  display: grid;
  gap: clamp(22px, 3vw, 44px);
}

.page-about .ab-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .ab-axis-item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ab-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-axis-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.2s var(--ease);
}

.page-about .ab-axis-item:hover,
.page-about .ab-axis-item:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .ab-axis-item:hover::before,
.page-about .ab-axis-item:focus-visible::before {
  background: var(--cyan);
}

.page-about .ab-years {
  display: grid;
  gap: clamp(24px, 3.4vh, 40px);
}

.page-about .ab-year {
  padding-bottom: clamp(22px, 3.4vh, 38px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-year:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-year-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-year-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-year-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(19px, 2.4vw, 26px);
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .ab-year-text {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ab-muted);
}

/* ---------- Team ---------- */
.page-about .ab-team-grid {
  margin-top: clamp(30px, 5vh, 54px);
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-team-item {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .ab-team-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--ab-muted);
}

.page-about .ab-team-media,
.page-about .ab-scale-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .ab-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 950;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
}

.page-about .ab-scale-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.6) brightness(0.86);
}

.page-about .ab-figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--grey);
}

/* ---------- Flow ---------- */
.page-about .ab-flow-media {
  margin: clamp(28px, 4.6vh, 46px) 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .ab-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1920 / 720;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .ab-flow-steps {
  list-style: none;
  margin: clamp(30px, 4.6vh, 52px) 0 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.page-about .ab-step {
  position: relative;
  padding: clamp(22px, 3vh, 30px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px var(--ink);
}

.page-about .ab-step-idx {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--grey);
}

.page-about .ab-step-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2.1vw, 20px);
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-step-text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ab-muted);
}

.page-about .ab-step-note {
  max-height: 200px;
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--cyan);
  overflow: hidden;
  transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease), margin-top 0.32s var(--ease);
}

/* ---------- Scale ---------- */
.page-about .ab-scale-grid {
  display: grid;
  gap: clamp(30px, 4.6vw, 54px);
  align-items: start;
}

.page-about .ab-stats {
  list-style: none;
  margin: clamp(26px, 4vh, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .ab-stat {
  display: grid;
  gap: 8px;
  align-content: end;
  min-height: clamp(108px, 15vw, 148px);
  padding: clamp(15px, 2.2vw, 22px) clamp(13px, 1.8vw, 20px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease);
}

.page-about .ab-stat:hover {
  background: rgba(0, 230, 195, 0.07);
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(25px, 4vw, 42px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-stat-unit {
  margin-left: 4px;
  font-size: 0.5em;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-stat-label {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

/* ---------- Stable panel ---------- */
.page-about .ab-stable-panel {
  padding: clamp(26px, 4.6vw, 56px);
  border-radius: var(--ab-radius);
}

.page-about .ab-stable-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-stable-copy .ab-intro {
  color: rgba(237, 243, 241, 0.82);
}

.page-about .ab-stable-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-stable-list li {
  position: relative;
  padding: 15px 0 15px 20px;
  border-top: 1px solid rgba(237, 243, 241, 0.2);
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--white);
}

.page-about .ab-stable-list li:last-child {
  border-bottom: 1px solid rgba(237, 243, 241, 0.2);
}

.page-about .ab-stable-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
}

/* ---------- Why ---------- */
.page-about .ab-why-list {
  list-style: none;
  margin: clamp(28px, 4vh, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-why-item {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 2.8vh, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-why-idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .ab-why-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .ab-why-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--ab-muted);
}

.page-about .ab-cta-row {
  margin-top: clamp(28px, 4vh, 46px);
}

.page-about .ab-cta-note {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--grey);
}

.page-about .ab-cta-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 230, 195, 0.4);
  padding-bottom: 1px;
}

.page-about .ab-cta-link:hover,
.page-about .ab-cta-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
  outline: none;
}

/* ---------- Reveal ---------- */
.page-about [data-reveal].is-visible {
  animation: ab-reveal 0.58s var(--ease) both;
}

@keyframes ab-reveal {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Breakpoints ---------- */
@media (min-width: 800px) {
  .page-about .ab-team-item {
    grid-template-columns: 148px minmax(0, 1fr);
    align-items: baseline;
    gap: 22px;
  }

  .page-about .ab-flow-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .ab-step-note {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
  }

  .page-about .ab-step:hover .ab-step-note,
  .page-about .ab-step:focus-within .ab-step-note {
    max-height: 200px;
    margin-top: 10px;
    opacity: 1;
  }

  .page-about .ab-why-item {
    grid-template-columns: 52px minmax(0, 190px) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }

  .page-about .ab-timeline-grid {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(28px, 3vw, 52px);
  }

  .page-about .ab-axis {
    position: sticky;
    top: calc(var(--header-h-scrolled) + 34px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-axis-item {
    position: relative;
    display: block;
    padding: 15px 10px 15px 20px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    margin-left: -1px;
    font-size: 12px;
    letter-spacing: 0.14em;
  }

  .page-about .ab-axis-item::before {
    position: absolute;
    left: -4px;
    top: 50%;
    margin-top: -3px;
    background: var(--ink);
    border: 1px solid var(--line);
  }

  .page-about .ab-axis-item:hover,
  .page-about .ab-axis-item:focus-visible {
    color: var(--orange);
    border-left-color: var(--orange);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

  .page-about .ab-axis-item:hover::before,
  .page-about .ab-axis-item:focus-visible::before {
    background: var(--orange);
    border-color: var(--orange);
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-scale-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .ab-stable-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal].is-visible {
    animation: none;
  }

  .page-about .ab-step-note,
  .page-about .ab-stat,
  .page-about .ab-axis-item {
    transition: none;
  }
}
<<<END>>>