.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 7vw, 5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(620px, 78vw);
  height: min(620px, 78vw);
  background: linear-gradient(140deg, rgba(46, 155, 230, 0.24), rgba(33, 212, 194, 0.07) 58%, transparent 76%);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 48, 74, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 74, 0.55) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7), transparent 78%);
  pointer-events: none;
}

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

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .ab-hero-lead h1 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-hero-lead .lede {
  margin-top: 1.1rem;
  max-width: 48ch;
  color: var(--on-night);
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
  line-height: 1.85;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .ab-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .fact {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.05rem;
  background: var(--panel);
}

.page-about .fact-num {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
  display: flex;
  align-items: baseline;
  gap: 0.15rem;
}

.page-about .fact-unit {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--on-night-soft);
}

.page-about .fact-label {
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--on-night-soft);
}

.page-about .fact--blue .fact-num { color: var(--flag-blue); }
.page-about .fact--green .fact-num { color: var(--flag-green); }
.page-about .fact--yellow .fact-num { color: var(--flag-yellow); }
.page-about .fact--red .fact-num { color: var(--flag-red); }

.page-about .ab-track {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .track-bg {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  border: 1px solid var(--paper-line);
  background: var(--white);
}

.page-about .track-bg .figure-media {
  aspect-ratio: 1200 / 760;
}

.page-about .track-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: clamp(1.75rem, 5vw, 3rem);
}

.page-about .track-scale {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.6rem;
  scrollbar-width: thin;
}

.page-about .track-tick {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 0 0 auto;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--muted);
  background: var(--white);
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .track-tick:hover {
  border-left-color: var(--cyan);
  color: var(--ink);
  transform: translateY(-1px);
}

.page-about .track-tick.is-current {
  border-color: var(--flag-yellow);
  border-left-color: var(--flag-yellow);
  background: var(--flag-yellow);
  color: var(--blue-night);
}

.page-about .tick-idx {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  opacity: 0.75;
}

.page-about .tick-label {
  font-size: 0.8rem;
  white-space: nowrap;
}

.page-about .track-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 2.4rem;
  position: relative;
}

.page-about .track-list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 1px;
  background: var(--paper-line);
}

.page-about .track-node {
  position: relative;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .track-node:last-child {
  margin-bottom: 0;
}

.page-about .track-node::before {
  content: "";
  position: absolute;
  left: calc(4px - 2.4rem);
  top: 1.5rem;
  width: 14px;
  height: 16px;
  background: var(--paper-line);
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
}

.page-about .track-node:target::before,
.page-about .track-node:hover::before {
  background: var(--flag-yellow);
}

.page-about .node-card {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.75rem);
  background: var(--white);
  border: 1px solid var(--paper-line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .node-card:hover {
  border-left-color: var(--flag-yellow);
  transform: translateY(-1px);
}

.page-about .track-node:target .node-card {
  border-color: var(--flag-yellow);
  border-left-color: var(--flag-yellow);
}

.page-about .node-idx {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .node-title {
  margin: 0.5rem 0 0.65rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.12rem, 2.6vw, 1.45rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .node-card p {
  margin: 0 0 0.85rem;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .node-card p:last-child {
  margin-bottom: 0;
}

.page-about .node-note {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-left: 2px solid var(--flag-yellow);
  padding-left: 0.6rem;
}

.page-about .node-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  margin: 1.1rem 0 0.9rem;
}

.page-about .node-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 0.85rem;
  background: var(--paper);
}

.page-about .stat-num {
  font-size: clamp(1.1rem, 2.4vw, 1.35rem);
  font-weight: 700;
  color: var(--flag-blue);
}

.page-about .stat-label {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .tag-row {
  margin-top: 1rem;
}

.page-about .version-panel {
  display: grid;
  gap: 0.55rem;
  margin-top: 1.2rem;
  padding: 1rem 1.1rem;
  background: var(--blue-night);
  border: 1px solid var(--line);
}

.page-about .version-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .version-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .version-key {
  font-size: 0.82rem;
  color: var(--on-night-soft);
}

.page-about .version-val {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--flag-yellow);
}

.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 1.2rem;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

.page-about .crew-col {
  padding: 1rem 1.05rem;
  background: var(--paper);
}

.page-about .crew-bar {
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 0.7rem;
  background: var(--flag-blue);
}

.page-about .crew-col--a .crew-bar { background: var(--flag-blue); }
.page-about .crew-col--b .crew-bar { background: var(--flag-green); }
.page-about .crew-col--c .crew-bar { background: var(--flag-yellow); }

.page-about .crew-title {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

.page-about .crew-list li {
  position: relative;
  padding-left: 0.85rem;
  margin-bottom: 0.4rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .crew-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 4px;
  height: 4px;
  background: var(--muted);
}

.page-about .node-figure {
  margin: 1.2rem 0 0;
}

.page-about .node-figure .figure-media {
  aspect-ratio: 1000 / 620;
  border: 1px solid var(--paper-line);
  background: var(--paper);
}

.page-about .node-figure .figure-media--wide {
  aspect-ratio: 1100 / 680;
}

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

.page-about .ab-next {
  padding-block: clamp(2.5rem, 6vw, 4.25rem);
}

.page-about .next-list {
  list-style: none;
  margin: clamp(1.75rem, 5vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .next-item {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--panel);
}

.page-about .next-idx {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--flag-yellow);
}

.page-about .next-title {
  margin: 0.55rem 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .next-item p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--on-night);
}

.page-about .ab-next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

@media (min-width: 720px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 920px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
  }

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

@media (min-width: 1040px) {
  .page-about .track-layout {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3rem);
  }

  .page-about .track-scale {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .track-tick {
    width: 100%;
  }

  .page-about .track-list {
    padding-left: 2.75rem;
  }

  .page-about .track-list::before {
    left: 12px;
  }

  .page-about .track-node::before {
    left: calc(5px - 2.75rem);
  }
}
<<<END>>>