.page-about {
  --about-aside: 200px;
  --about-gap: clamp(22px, 3.4vw, 52px);
  --about-pad: clamp(38px, 5.6vw, 78px);
  position: relative;
  background:
    radial-gradient(760px 380px at 88% -4%, rgba(232, 162, 58, .13), transparent 68%),
    radial-gradient(620px 420px at -10% 22%, rgba(79, 183, 154, .08), transparent 70%),
    var(--ink-navy);
  color: var(--text-body);
  overflow-x: hidden;
}

.page-about .about-inline-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 162, 58, .45);
}
.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 34px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}
.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}
.page-about .about-hero__copy {
  min-width: 0;
}
.page-about .about-hero__copy h1 {
  margin: 10px 0 0;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: .04em;
  font-weight: 800;
  color: var(--paper);
  text-wrap: balance;
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: clamp(.95rem, 1.05vw, 1.0625rem);
  line-height: 1.85;
  color: var(--text-body);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .about-hero__marks {
  list-style: none;
  margin: 28px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--hair);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: .82rem;
  color: var(--fog);
}
.page-about .about-hero__marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.page-about .about-hero__marks .mono {
  color: var(--amber);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .02em;
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: linear-gradient(150deg, var(--archive), var(--ink-black));
  box-shadow: var(--shadow-panel);
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  opacity: .92;
}
.page-about .about-hero__cap {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 8px 15px;
  border-radius: var(--r-pill);
  background: rgba(7, 10, 16, .8);
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: .75rem;
  letter-spacing: .05em;
}
.page-about .about-hero__cap .mono {
  color: var(--signal);
  font-weight: 700;
}

/* ---------- chapters ---------- */
.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-chapter:last-of-type {
  border-bottom: 0;
}
.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .about-chapter__aside {
  min-width: 0;
}
.page-about .chapter-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  line-height: .92;
  letter-spacing: .04em;
  font-weight: 700;
  color: rgba(232, 162, 58, .2);
  -webkit-text-stroke: 1px rgba(232, 162, 58, .55);
}
.page-about .aside-list {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .aside-item {
  border-top: 1px dashed var(--hair);
  padding-top: 8px;
}
.page-about .aside-item dt {
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--fog);
}
.page-about .aside-item dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: .86rem;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.page-about .about-chapter__body {
  min-width: 0;
}
.page-about .chapter-title {
  margin: 0;
  font-size: clamp(1.45rem, 2.6vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: .03em;
  font-weight: 800;
  color: var(--paper);
}
.page-about .about-chapter__body > p {
  margin: 16px 0 0;
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--text-body);
}
.page-about .about-tail-link {
  margin: 24px 0 0;
}

/* ---------- archive map ---------- */
.page-about .about-map-wrap {
  display: none;
  margin: 26px 0 8px;
}
.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-map text {
  font-family: var(--font-sans);
}
.page-about .about-map .map-mono {
  font-family: var(--font-mono);
  letter-spacing: .04em;
}
.page-about .index-cards {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .index-card {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(22, 35, 61, .86), rgba(11, 19, 36, .55));
  overflow: hidden;
}
.page-about .index-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent, var(--amber));
  opacity: .85;
}
.page-about .index-card--a { --accent: var(--amber); }
.page-about .index-card--b { --accent: var(--signal); }
.page-about .index-card--c { --accent: var(--celadon); }
.page-about .index-card--d { --accent: var(--fog); }
.page-about .index-card__range {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--accent, var(--amber));
}
.page-about .index-card__title {
  margin: 10px 0 0;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
}
.page-about .index-card__text {
  margin: 9px 0 0;
  font-size: .88rem;
  line-height: 1.72;
  color: var(--fog);
}

/* ---------- v4 anchors ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(30, 58, 58, .5), rgba(22, 35, 61, .7));
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 11px 16px 13px;
  font-size: .76rem;
  line-height: 1.6;
  color: var(--fog);
  border-top: 1px solid var(--hair);
}
.page-about .anchor-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .anchor-item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(30, 58, 58, .42), rgba(22, 35, 61, .72));
  overflow: hidden;
}
.page-about .anchor-item[open] {
  border-color: rgba(232, 162, 58, .42);
}
.page-about .anchor-item__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .anchor-item__sum::-webkit-details-marker {
  display: none;
}
.page-about .anchor-item__date {
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .05em;
  color: var(--signal);
}
.page-about .anchor-item__name {
  flex: 1 1 100%;
  font-size: .9rem;
  color: var(--paper);
  line-height: 1.5;
}
.page-about .anchor-item__body {
  padding: 0 16px 16px;
}
.page-about .anchor-item__body ul {
  margin: 0;
  padding-left: 18px;
}
.page-about .anchor-item__body li {
  margin-top: 7px;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--fog);
}
.page-about .anchor-item__body li::marker {
  color: var(--celadon);
}

/* ---------- team ---------- */
.page-about .team-stats {
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .team-stat {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(22, 35, 61, .58);
}
.page-about .team-stat--lead {
  padding-bottom: 26px;
  border-color: rgba(232, 162, 58, .35);
  background: linear-gradient(160deg, rgba(232, 162, 58, .16), rgba(22, 35, 61, .82));
}
.page-about .team-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}
.page-about .team-stat--lead .team-stat__num {
  color: var(--amber);
}
.page-about .team-stat__label {
  display: block;
  margin-top: 9px;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--fog);
}
.page-about .step-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .step-flow__item {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(22, 35, 61, .5);
}
.page-about .step-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--celadon);
}
.page-about .step-flow__title {
  margin: 8px 0 0;
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
}
.page-about .step-flow__item p {
  margin: 7px 0 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- milestones ---------- */
.page-about .milestones {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .milestone {
  position: relative;
  padding-left: 26px;
}
.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(232, 162, 58, .14);
}
.page-about .milestone::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  bottom: -22px;
  width: 1px;
  background: var(--line-strong);
}
.page-about .milestone:last-child::after {
  display: none;
}
.page-about .milestone__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
}
.page-about .milestone p {
  margin: 7px 0 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--fog);
}

/* ---------- scope ---------- */
.page-about .scope-panel {
  margin-top: 26px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(420px 220px at 92% 6%, rgba(79, 183, 154, .16), transparent 68%),
    linear-gradient(160deg, rgba(22, 35, 61, .92), rgba(7, 10, 16, .86));
}
.page-about .scope-panel__title {
  margin: 0;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  line-height: 1.4;
  letter-spacing: .03em;
  font-weight: 700;
  color: var(--paper);
}
.page-about .scope-panel__text {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--text-body);
}
.page-about .contact-rows {
  margin: 22px 0 0;
  display: grid;
  gap: 12px;
}
.page-about .contact-row {
  border-top: 1px dashed var(--hair);
  padding-top: 10px;
}
.page-about .contact-row dt {
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--fog);
}
.page-about .contact-row dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: .88rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}
.page-about .scope-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

/* ---------- mobile fab ---------- */
.page-about .about-fab {
  display: none;
}

/* ---------- breakpoints ---------- */
@media (min-width: 520px) {
  .page-about .index-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .aside-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 18px;
  }
  .page-about .anchor-item__name {
    flex: 1 1 auto;
  }
}

@media (min-width: 620px) {
  .page-about .step-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-map-wrap {
    display: block;
  }
  .page-about .milestones {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
  .page-about .milestone {
    padding-left: 0;
    padding-top: 34px;
  }
  .page-about .milestone::before {
    left: 0;
    top: 6px;
  }
  .page-about .milestone::after {
    left: 13px;
    right: -24px;
    top: 10px;
    bottom: auto;
    width: auto;
    height: 1px;
  }
  .page-about .milestone:last-child::after {
    display: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }
  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-aside) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .chapter-num {
    margin-bottom: 18px;
  }
  .page-about .aside-list {
    grid-template-columns: 1fr;
  }
  .page-about .step-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
  .page-about .step-flow__item + .step-flow__item::before {
    content: "";
    position: absolute;
    left: -14px;
    top: 50%;
    width: 14px;
    height: 1px;
    background: var(--line-strong);
  }
}

@media (min-width: 1000px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }
}

@media (max-width: 899px) {
  .page-about .about-fab {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    right: 14px;
    bottom: 16px;
    z-index: 30;
    padding: 12px 20px;
    border-radius: var(--r-pill);
    background: var(--amber);
    color: var(--ink-black);
    font-size: .85rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-decoration: none;
    box-shadow: 0 14px 30px -14px rgba(0, 0, 0, .92);
  }
  .page-about .about-fab:active {
    background: var(--amber-deep);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fab {
    transition: none;
  }
}
<<<END>>>