.page-about {
  --about-rule: rgba(143, 163, 184, .18);
  --about-rule-soft: rgba(143, 163, 184, .10);
  background: var(--ink-1);
  color: var(--paper);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(115% 90% at 88% -10%, rgba(53, 224, 232, .16), transparent 62%),
    radial-gradient(90% 70% at 0% 110%, rgba(255, 106, 43, .12), transparent 60%),
    linear-gradient(180deg, var(--ink-2), var(--ink-1));
  border-bottom: 1px solid var(--about-rule);
}

.page-about .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: start;
}

.page-about .about-hero__lead {
  min-width: 0;
}

.page-about .about-hero__lead .kicker {
  color: var(--signal);
}

.page-about .about-hero__lead h1 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 8.2vw, 78px);
  font-weight: 800;
  line-height: .98;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 40ch;
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: #D5DFEA;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-collage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}

.page-about .about-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px 16px;
  background: var(--ink-3);
  border-top: 3px solid var(--signal);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: transform .18s var(--ease), background-color .18s var(--ease);
}

.page-about .about-tile:hover {
  transform: translateY(-3px);
  background: #14315C;
}

.page-about .about-tile--wide {
  grid-column: 1 / -1;
}

.page-about .about-tile--lava {
  border-top-color: var(--flag-yellow);
  background: linear-gradient(140deg, var(--lava), #E2531C);
  color: var(--ink-0);
}

.page-about .about-tile--lava:hover {
  background: linear-gradient(140deg, #FF7C45, #E2531C);
}

.page-about .about-tile__num {
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-tile--lava .about-tile__num {
  color: var(--ink-0);
}

.page-about .about-tile__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-tile--lava .about-tile__label {
  color: rgba(2, 7, 13, .74);
  font-weight: 600;
}

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  min-width: 0;
  border-bottom: 1px solid var(--about-rule);
  padding-bottom: 20px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--paper);
  text-decoration: none;
  background: var(--ink-3);
  border-left: 2px solid transparent;
  transition: border-color .16s var(--ease), color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-left-color: var(--signal);
  background: #14315C;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
}

.page-about .about-rail__timeline {
  margin-top: 20px;
}

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

.page-about .about-rail__year {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 6px 0;
  font-size: 13px;
  color: #C3D0DD;
  text-decoration: none;
  border-bottom: 1px dashed var(--about-rule-soft);
}

.page-about .about-rail__year span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--lava);
  letter-spacing: .06em;
}

.page-about .about-rail__year:hover,
.page-about .about-rail__year:focus-visible {
  color: var(--signal);
}

.page-about .about-rail__jump {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding: clamp(26px, 3.6vw, 44px) 0;
  border-top: 1px solid var(--about-rule);
  scroll-margin-top: 110px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(23px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-prose p {
  max-width: 42ch;
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: #C7D4E1;
}

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

.page-about .about-map {
  margin: clamp(18px, 2.6vw, 28px) 0;
  padding: 10px;
  background: var(--ink-2);
  border-left: 3px solid var(--signal);
}

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

.page-about .about-figure {
  margin: clamp(18px, 2.8vw, 28px) 0;
  background: var(--ink-2);
  border: 1px solid var(--about-rule-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border-top: 2px solid var(--line-signal);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px 16px;
  background: var(--ink-2);
  transition: background-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-stat:hover {
  background: var(--ink-3);
  transform: translateY(-2px);
}

.page-about .about-stat__value {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 800;
  line-height: 1.05;
  color: var(--signal);
  letter-spacing: .01em;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-steps {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  border-left: 3px solid var(--lava);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0 16px 14px;
  border-bottom: 1px dashed var(--about-rule);
}

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

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--lava);
  padding-top: 3px;
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: #BFCEDD;
}

.page-about .about-milestones {
  position: relative;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--signal), rgba(255, 106, 43, .8));
}

.page-about .about-milestone {
  position: relative;
  padding-bottom: 24px;
}

.page-about .about-milestone:last-child {
  padding-bottom: 0;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--ink-1);
  border: 2px solid var(--signal);
  transform: rotate(45deg);
}

.page-about .about-milestone__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--flag-yellow);
}

.page-about .about-milestone__title {
  margin: 4px 0 6px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-milestone__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: #BFCEDD;
}

.page-about .about-note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 16px 18px;
  background: linear-gradient(100deg, rgba(53, 224, 232, .12), rgba(11, 31, 58, .2));
  border-left: 3px solid var(--signal);
}

.page-about .about-note p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: #DCE6F0;
}

.page-about .about-close {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(22px, 3.6vw, 40px);
  background: linear-gradient(135deg, var(--ink-3), var(--ink-2) 70%);
  border-top: 3px solid var(--lava);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-close__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-close__text {
  margin: 0 0 18px;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.85;
  color: #C7D4E1;
}

.page-about .about-close__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-bottom: 0;
    padding-bottom: 0;
    border-left: 2px solid var(--about-rule);
    padding-left: 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow-x: visible;
  }

  .page-about .about-rail__link {
    background: transparent;
    padding: 6px 0;
    border-left: 0;
    border-bottom: 1px dashed var(--about-rule-soft);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    color: var(--signal);
    border-bottom-color: var(--signal);
  }

  .page-about .about-figure {
    max-width: 82%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tile,
  .page-about .about-stat,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-tile:hover,
  .page-about .about-stat:hover {
    transform: none;
  }
}
<<<END>>>