.page-about {
  --ab-pad: clamp(56px, 8vw, 104px);
  --ab-gap: clamp(24px, 4vw, 48px);
  --ab-line: 2px solid var(--silver);
  --ab-shadow: 0 20px 44px rgba(7, 26, 51, 0.16);
  --ab-dark-card: rgba(6, 47, 92, 0.46);
  --ab-hairline: rgba(201, 210, 220, 0.3);
  background: var(--paper);
  color: var(--graphite);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
}

.page-about h2 {
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
}

.page-about h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
}

.page-about p {
  margin: 0;
  line-height: 1.8;
}

.page-about .ab-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
  padding-bottom: 4px;
  border-bottom: 2px solid currentColor;
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--orange-deep);
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 76px) 0 clamp(48px, 7vw, 92px);
  background: linear-gradient(155deg, var(--ink-900) 0%, var(--ink-800) 58%, #0a3a70 100%);
  color: var(--mist);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 70%;
  height: 90%;
  background: radial-gradient(closest-side, rgba(31, 182, 201, 0.24), transparent 72%);
  pointer-events: none;
}

.page-about .ab-hero .crumb,
.page-about .ab-hero .crumb a,
.page-about .ab-hero .crumb span {
  color: rgba(201, 210, 220, 0.78);
  font-size: 13px;
  text-decoration: none;
}

.page-about .ab-hero .crumb a:hover,
.page-about .ab-hero .crumb a:focus-visible {
  color: var(--orange);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-hero__main {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero h1 {
  margin: 12px 0 20px;
  max-width: 18ch;
  color: #ffffff;
  font-size: clamp(2.05rem, 5.6vw, 3.9rem);
}

.page-about .ab-hero__lead {
  max-width: 52ch;
  color: var(--silver);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.85;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .ab-hero__index {
  position: relative;
  z-index: 1;
  border: 2px solid rgba(201, 210, 220, 0.34);
  background: var(--ab-dark-card);
  padding: 20px 20px 12px;
  box-shadow: 10px 10px 0 rgba(11, 74, 143, 0.35);
}

.page-about .ab-hero__index-title {
  margin-bottom: 12px;
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--ab-hairline);
}

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

.page-about .ab-facts dt {
  color: var(--silver);
  font-size: 13px;
}

.page-about .ab-facts dd {
  margin: 0;
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
}

/* ---------- section shells ---------- */
.page-about .ab-sec {
  padding: var(--ab-pad) 0;
}

.page-about .ab-sec--light {
  background: var(--mist);
  color: var(--graphite);
}

.page-about .ab-sec--paper {
  background: var(--paper);
  color: var(--graphite);
}

.page-about .ab-sec--dark {
  background: linear-gradient(180deg, var(--ink-900), #082murmur 0%, var(--ink-800) 100%);
  color: var(--silver);
}

.page-about .ab-sec__head {
  max-width: 68ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .ab-sec__head h2 {
  margin: 10px 0 14px;
  color: #ffffff;
}

.page-about .ab-sec--dark .ab-sec__intro {
  color: rgba(201, 210, 220, 0.86);
}

.page-about .ab-sec__head--dark h2 {
  color: var(--ink-900);
}

.page-about .ab-sec__intro {
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.4vw, 1.06rem);
}

.page-about .ab-sec__head--dark .ab-sec__intro {
  color: #3a4a5c;
}

/* ---------- origin split ---------- */
.page-about .ab-split {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-split__text .prose {
  display: grid;
  gap: 16px;
  margin-top: 18px;
  color: #2b3948;
}

.page-about .ab-clients {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-clients li {
  border: 2px solid var(--blue);
  background: var(--paper);
  padding: 6px 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

.page-about .ab-figure {
  margin: 0;
  border: 3px solid var(--ink-900);
  background: var(--paper);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.02);
}

.page-about .ab-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .ab-figure__cap {
  border-top: 2px solid var(--ink-900);
  padding: 10px 14px;
  color: #3a4a5c;
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- timeline ---------- */
.page-about .ab-tl {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

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

.page-about .ab-tl__tick {
  flex: 0 0 auto;
  border: 2px solid rgba(201, 210, 220, 0.34);
  padding: 8px 14px;
  color: var(--silver);
  font-size: 13px;
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-tl__tick:hover,
.page-about .ab-tl__tick:focus-visible {
  border-color: var(--orange);
  background: var(--orange);
  color: var(--ink-900);
}

.page-about .ab-tl__items {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.4vw, 28px);
  padding-left: 30px;
}

.page-about .ab-tl__items::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(31, 182, 201, 0.12));
}

.page-about .ab-tl__item {
  position: relative;
  border: 2px solid var(--ab-hairline);
  background: var(--ab-dark-card);
  padding: clamp(18px, 2.4vw, 26px);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -29px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 182, 201, 0.18);
}

.page-about .ab-tl__item:hover,
.page-about .ab-tl__item:focus-within {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .ab-tl__year {
  margin-bottom: 8px;
  color: var(--orange);
  font-size: 14px;
  font-weight: 700;
}

.page-about .ab-tl__item h3 {
  margin-bottom: 8px;
  color: #ffffff;
}

.page-about .ab-tl__item p {
  color: rgba(201, 210, 220, 0.86);
  font-size: 15px;
}

/* ---------- cert tabs ---------- */
.page-about .ab-tabs {
  border-top: 3px solid var(--ink-900);
  padding-top: 24px;
}

.page-about .ab-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .ab-tabs .tab {
  border: 2px solid var(--silver);
  background: transparent;
  padding: 9px 16px;
  color: #3a4a5c;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-tabs .tab:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.page-about .ab-tabs .tab[aria-selected="true"] {
  border-color: var(--blue);
  background: var(--blue);
  color: #ffffff;
}

.page-about .ab-tabs .tab:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .tabpanel[hidden],
.page-about .tabpanel[aria-hidden="true"] {
  display: none;
}

.page-about .ab-panel__lead {
  margin-bottom: 18px;
  max-width: 62ch;
  color: #2b3948;
}

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

.page-about .ab-cert__row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  border-top: 1px solid var(--silver);
  padding: 14px 0;
}

.page-about .ab-cert__row:last-child {
  border-bottom: 1px solid var(--silver);
}

.page-about .ab-cert__num {
  display: block;
  background: var(--blue);
  padding: 4px 0;
  color: #ffffff;
  font-size: 12px;
  text-align: center;
}

.page-about .ab-cert__text {
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- team ---------- */
.page-about .ab-team {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 3.5vw, 40px);
}

.page-about .ab-team__card {
  border: 2px solid var(--ink-900);
  background: var(--paper);
  padding: 20px;
  box-shadow: 6px 6px 0 rgba(11, 74, 143, 0.16);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus {
  outline: none;
  transform: translateY(-4px);
  box-shadow: 10px 12px 0 rgba(11, 74, 143, 0.24);
}

.page-about .ab-team__city {
  margin-bottom: 8px;
  color: var(--orange-deep);
  font-size: 13px;
  letter-spacing: 0.14em;
}

.page-about .ab-team__role {
  margin-bottom: 10px;
  color: var(--ink-900);
}

.page-about .ab-team__desc {
  color: #3a4a5c;
  font-size: 14.5px;
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(26px, 3.5vw, 40px) 0 0;
  background: var(--silver);
}

.page-about .ab-metrics__item {
  background: var(--paper);
  padding: 18px 16px;
}

.page-about .ab-metrics dt {
  color: #3a4a5c;
  font-size: 13px;
}

.page-about .ab-metrics dd {
  margin: 8px 0 0;
  color: var(--blue);
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 700;
}

/* ---------- node ---------- */
.page-about .ab-node {
  background: var(--ink-900);
  color: var(--silver);
  padding-top: var(--ab-pad);
}

.page-about .ab-node__text {
  padding-bottom: clamp(32px, 5vw, 56px);
}

.page-about .ab-node__text h2 {
  margin: 10px 0 16px;
  max-width: 20ch;
  color: #ffffff;
}

.page-about .ab-node__text > p {
  max-width: 62ch;
  color: rgba(201, 210, 220, 0.86);
}

.page-about .ab-node__list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-node__list li {
  display: grid;
  gap: 4px;
  border-left: 3px solid var(--cyan);
  padding-left: 14px;
  font-size: 14.5px;
  line-height: 1.7;
}

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

.page-about .ab-node .ab-link {
  color: var(--orange);
}

.page-about .ab-node .ab-link:hover,
.page-about .ab-node .ab-link:focus-visible {
  color: #ffffff;
}

.page-about .ab-node__figure {
  position: relative;
  margin: 0;
  border-top: 3px solid var(--orange);
}

.page-about .ab-node__figure img {
  width: 100%;
  height: clamp(200px, 34vw, 420px);
  object-fit: cover;
  filter: saturate(0.8) brightness(0.86);
}

.page-about .ab-node__cap {
  position: absolute;
  right: 16px;
  bottom: 14px;
  background: rgba(7, 26, 51, 0.82);
  padding: 6px 12px;
  color: var(--silver);
  font-size: 11px;
  letter-spacing: 0.14em;
}

/* ---------- ecosystem ---------- */
.page-about .ab-eco {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-eco__text h2 {
  margin: 10px 0 16px;
  color: var(--ink-900);
}

.page-about .ab-eco__text p {
  margin-bottom: 14px;
  max-width: 62ch;
  color: #2b3948;
}

.page-about .ab-eco__tags {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-eco__tags li {
  border: 2px solid var(--ink-900);
  background: var(--mist);
  padding: 14px 16px;
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .ab-eco__tags li:nth-child(2n) {
  border-color: var(--blue);
  color: var(--blue);
}

/* ---------- next ---------- */
.page-about .ab-next {
  background: linear-gradient(140deg, var(--ink-800), var(--ink-900) 70%);
  color: var(--silver);
  padding: var(--ab-pad) 0;
}

.page-about .ab-next h2 {
  margin: 10px 0 14px;
  color: #ffffff;
}

.page-about .ab-next__lead {
  max-width: 58ch;
  color: rgba(201, 210, 220, 0.86);
}

.page-about .ab-next__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 3.5vw, 42px);
}

.page-about .ab-next__item {
  border-top: 3px solid var(--cyan);
  background: var(--ab-dark-card);
  padding: 20px;
}

.page-about .ab-next__num {
  margin-bottom: 10px;
  color: var(--orange);
  font-size: 20px;
}

.page-about .ab-next__item h3 {
  margin-bottom: 8px;
  color: #ffffff;
}

.page-about .ab-next__item p {
  color: rgba(201, 210, 220, 0.84);
  font-size: 14.5px;
}

/* ---------- cta ---------- */
.page-about .ab-cta {
  background: var(--paper);
  color: var(--graphite);
  padding: var(--ab-pad) 0;
  border-top: 3px solid var(--ink-900);
}

.page-about .ab-cta h2 {
  max-width: 24ch;
  margin-bottom: clamp(22px, 3vw, 34px);
  color: var(--ink-900);
}

.page-about .ab-cta__grid {
  display: grid;
  gap: 14px;
}

.page-about .ab-cta__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px 16px;
  border: 2px solid var(--ink-900);
  background: var(--mist);
  padding: 18px 20px;
  color: var(--ink-900);
  text-decoration: none;
  transition: background 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-cta__label {
  grid-column: 1 / -1;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .ab-cta__desc {
  font-size: 14.5px;
  line-height: 1.6;
}

.page-about .ab-cta__arrow {
  font-size: 20px;
  line-height: 1;
}

.page-about .ab-cta__card:hover,
.page-about .ab-cta__card:focus-visible {
  background: var(--orange);
  transform: translateY(-3px);
}

.page-about .ab-cta__card:hover .ab-cta__label,
.page-about .ab-cta__card:focus-visible .ab-cta__label {
  color: var(--ink-900);
}

.page-about .ab-cta__card:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

/* ---------- breakpoints ---------- */
@media (min-width: 640px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-eco__tags {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cta__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .ab-tl {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-tl__rail {
    position: sticky;
    top: 128px;
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .ab-tl__tick {
    text-align: center;
    letter-spacing: 0.08em;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-eco {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }

  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-team__desc {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
  }

  .page-about .ab-team__card:hover .ab-team__desc,
  .page-about .ab-team__card:focus .ab-team__desc {
    max-height: 220px;
    margin-top: 0;
    opacity: 1;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__item,
  .page-about .ab-team__card,
  .page-about .ab-cta__card,
  .page-about .ab-tl__tick {
    transition: none;
  }

  .page-about .ab-tl__item:hover,
  .page-about .ab-team__card:hover,
  .page-about .ab-cta__card:hover {
    transform: none;
  }
}
<<<END>>>