.page-about {
  --ab-rail: 20rem;
  --ab-gap: clamp(24px, 4vw, 56px);
  background: var(--night);
  color: var(--text);
  overflow-x: clip;
}

.page-about a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  padding: clamp(16px, 2.4vw, 26px) 0 clamp(40px, 6vw, 72px);
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(760px 380px at 92% -6%, rgba(155, 123, 255, 0.20), transparent 68%),
    radial-gradient(620px 320px at 4% 0%, rgba(57, 244, 224, 0.13), transparent 70%),
    var(--night);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .ab-hero-main {
  min-width: 0;
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.035em;
  color: #F4F7FC;
  max-width: 16em;
}

.page-about .ab-lede {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--steel);
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .ab-stat {
  min-width: 0;
  border-top: 2px solid var(--accent);
  padding-top: 10px;
}

.page-about .ab-stat-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--steel);
}

/* ---------- hero index rail ---------- */
.page-about .ab-hero-rail {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  box-shadow: 0 26px 64px -40px rgba(0, 0, 0, 0.95);
}

.page-about .ab-rail-head {
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(21, 26, 35, 0.22);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(21, 26, 35, 0.6);
}

.page-about .ab-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-index-link {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 6px;
  border-left: 2px solid transparent;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.page-about .ab-index-link:hover,
.page-about .ab-index-link:focus-visible {
  background: rgba(21, 26, 35, 0.07);
  border-left-color: var(--orange);
  transform: translateX(2px);
}

.page-about .ab-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(21, 26, 35, 0.55);
}

/* ---------- shell ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  padding: clamp(34px, 5vw, 64px) 0 clamp(48px, 7vw, 88px);
}

.page-about .ab-narrative {
  min-width: 0;
}

/* ---------- sections ---------- */
.page-about .ab-sec {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--grid);
}

.page-about .ab-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-sec-title {
  margin: 8px 0 0;
  max-width: 22em;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: #F2F6FD;
}

.page-about .ab-sec-note {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .ab-prose p {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-prose a:hover {
  color: var(--accent-2);
}

/* ---------- figures ---------- */
.page-about .ab-figure {
  margin: 24px 0 0;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-deep);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--grid);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- team quad ---------- */
.page-about .ab-quad {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-quad-item {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
}

.page-about .ab-quad-item > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-quad-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-quad-num {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.4;
  padding: 1px 5px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: var(--accent);
}

.page-about .ab-quad-role {
  font-size: 15.5px;
  font-weight: 700;
  color: #EFF4FC;
}

.page-about .ab-quad-count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--steel);
  white-space: nowrap;
}

.page-about .ab-quad-body {
  padding: 0 16px 16px;
}

.page-about .ab-quad-body p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--grid);
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .ab-quad-item[open] {
  border-left-color: var(--accent-2);
}

/* ---------- workflow steps ---------- */
.page-about .ab-steps {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-step {
  min-width: 0;
  border-top: 3px solid var(--accent);
  padding-top: 12px;
}

.page-about .ab-step-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.page-about .ab-step-title {
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 800;
  color: #EFF4FC;
}

.page-about .ab-step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- method list + paper note ---------- */
.page-about .ab-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--grid);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .ab-list li > span:first-child {
  font-family: var(--mono);
  color: var(--orange);
}

.page-about .ab-list strong {
  color: #EFF4FC;
  font-weight: 700;
}

.page-about .ab-note {
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--paper);
  color: var(--ink);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
}

.page-about .ab-note h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-note p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(21, 26, 35, 0.82);
}

/* ---------- network metrics ---------- */
.page-about .ab-metrics {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-metric {
  min-width: 0;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-top: 2px solid var(--accent-2);
  border-radius: var(--radius);
}

.page-about .ab-metric-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(20px, 3vw, 26px);
  color: var(--accent-2);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-metric-label {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- milestones ---------- */
.page-about .ab-milestones {
  --ab-pad: clamp(14px, 2.4vw, 26px);
  margin-top: 24px;
  padding-left: var(--ab-pad);
  border-left: 1px solid var(--grid);
  display: grid;
  gap: 10px;
}

.page-about .ab-milestone {
  position: relative;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
}

.page-about .ab-milestone::before {
  content: "";
  position: absolute;
  top: 19px;
  left: calc(-1 * var(--ab-pad) - 4.5px);
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--night);
}

.page-about .ab-milestone[open]::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .ab-milestone > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-milestone > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-ms-year {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ms-title {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.6;
  color: #EFF4FC;
}

.page-about .ab-milestone > p {
  margin: 0;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--grid);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- cta ---------- */
.page-about .ab-cta {
  margin-top: clamp(30px, 4vw, 48px);
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(57, 244, 224, 0.10), rgba(155, 123, 255, 0.14)),
    var(--panel-deep);
}

.page-about .ab-cta-title {
  margin: 8px 0 0;
  font-size: clamp(20px, 2.8vw, 27px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: #F2F6FD;
}

.page-about .ab-cta p {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .ab-cta .btn-row {
  margin-top: 20px;
}

/* ---------- aside ---------- */
.page-about .ab-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  min-width: 0;
  align-content: start;
}

.page-about .ab-card {
  min-width: 0;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
}

.page-about .ab-card--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: transparent;
}

.page-about .ab-card-title {
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--grid);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .ab-card--paper .ab-card-title {
  color: rgba(21, 26, 35, 0.6);
  border-bottom-color: rgba(21, 26, 35, 0.22);
}

.page-about .ab-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-roster li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 7px;
  border-bottom: 1px dashed var(--grid);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text);
}

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

.page-about .ab-card--paper .ab-roster li {
  color: var(--ink);
  border-bottom-color: rgba(21, 26, 35, 0.18);
}

.page-about .ab-roster li > span:last-child {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--accent);
  white-space: nowrap;
}

.page-about .ab-card--paper .ab-roster li > span:last-child {
  color: #8A4B12;
}

.page-about .ab-roster--years li {
  display: block;
  padding-bottom: 7px;
}

.page-about .ab-yearlink {
  display: block;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 8px;
  transition: color 0.18s ease, border-color 0.18s ease, padding-left 0.18s ease;
}

.page-about .ab-yearlink:hover,
.page-about .ab-yearlink:focus-visible {
  color: var(--accent);
  border-left-color: var(--accent);
  padding-left: 12px;
}

/* ---------- responsive ---------- */
@media (min-width: 520px) {
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 700px) {
  .page-about .ab-quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .ab-step {
    padding-right: clamp(16px, 2vw, 26px);
  }

  .page-about .ab-step + .ab-step {
    border-left: 1px solid var(--grid);
    padding-left: clamp(16px, 2vw, 26px);
  }

  .page-about .ab-step:last-child {
    padding-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1fr) 19rem;
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .ab-hero-rail {
    margin-top: 6px;
  }
}

@media (min-width: 980px) {
  .page-about .ab-shell {
    grid-template-columns: minmax(0, 1fr) var(--ab-rail);
    align-items: start;
  }

  .page-about .ab-aside {
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index-link,
  .page-about .ab-yearlink {
    transition: none;
  }

  .page-about .ab-index-link:hover,
  .page-about .ab-index-link:focus-visible {
    transform: none;
  }
}