.page-about {
  --about-top-gap: clamp(20px, 4vw, 36px);
  --about-sec-gap: clamp(40px, 7vw, 76px);
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: clip;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: var(--about-top-gap) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .crumb {
  color: var(--mist);
  text-decoration: none;
}

.page-about a.crumb:hover {
  color: var(--cyan);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  padding: clamp(18px, 3vw, 30px) 0 clamp(26px, 4vw, 44px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  align-items: start;
}

.page-about .about-title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.06;
  letter-spacing: .005em;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: clamp(22px, 4vw, 34px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  padding: 14px 0 13px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-stat--signal .about-stat__num {
  color: var(--signal);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- .page-about layout ---------- */

.page-about .about-body {
  padding-top: clamp(26px, 4vw, 44px);
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 12px;
  margin: 0 0 8px;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail .anchor-nav__link {
  flex: none;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail .anchor-nav__link:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .about-rail .anchor-nav__link[aria-current="true"] {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
}

/* ---------- sections ---------- */

.page-about .about-sec {
  margin-bottom: var(--about-sec-gap);
  scroll-margin-top: 96px;
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-sec__title {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.14;
  color: var(--paper);
}

.page-about .about-sec__lead {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-mini {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-cols {
  display: grid;
  gap: 16px;
}

.page-about .about-cols__item {
  padding: 16px 16px 14px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(14, 36, 56, .55);
}

.page-about .about-cols__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- timeline ---------- */

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(var(--cyan), var(--line) 70%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 24px;
  transition: transform var(--dur) var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 227, 208, .1);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 227, 208, .18);
}

.page-about .tl-item__tag {
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .tl-item__title {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .tl-item p {
  margin: 0 0 8px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .tl-item p.tl-item__note {
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--signal);
  font-size: 13.5px;
  color: var(--paper);
}

.page-about .tl-item p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 208, .4);
}

.page-about .tl-item p a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- tiers ---------- */

.page-about .tiers {
  display: grid;
  gap: 12px;
}

.page-about .tier {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tier:hover {
  border-color: rgba(47, 227, 208, .5);
}

.page-about .tier__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .tier__idx {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .tier__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--paper);
}

.page-about .tier__meter {
  position: relative;
  display: block;
  height: 2px;
  margin: 12px 0 12px;
  background: var(--line);
}

.page-about .tier__meter::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 25%;
  background: var(--cyan);
}

.page-about .tier:nth-child(2) .tier__meter::after {
  width: 50%;
}

.page-about .tier:nth-child(3) .tier__meter::after {
  width: 75%;
}

.page-about .tier:nth-child(4) .tier__meter::after {
  width: 100%;
  background: var(--signal);
}

.page-about .tier__desc {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .tier__fit {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
}

/* ---------- scenes filter ---------- */

.page-about .scenes {
  margin-top: clamp(22px, 3.5vw, 30px);
  padding-top: clamp(16px, 3vw, 22px);
  border-top: 1px solid var(--line-soft);
}

.page-about .scenes__label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .scenes__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .filter-btn {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.2;
  padding: 8px 13px;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--paper);
  border-color: var(--signal);
  background: var(--signal-soft);
}

.page-about .scenes__count {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .scenes__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .scene {
  padding: 13px 14px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(14, 36, 56, .55);
}

.page-about .scene__title {
  margin: 0 0 5px;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .scene__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- coverage ---------- */

.page-about .cover {
  display: grid;
  gap: 20px;
}

.page-about .cover__map {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 18% 8%, rgba(47, 227, 208, .1), transparent 62%),
    var(--ink-800);
}

.page-about .cover__nodes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.page-about .cover-node {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 8px;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  font-size: 12.5px;
  color: var(--mist);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .cover-node__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 227, 208, .1);
  transition: box-shadow var(--dur) var(--ease);
}

.page-about .cover-node:hover {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(47, 227, 208, .07);
}

.page-about .cover-node:hover .cover-node__dot {
  box-shadow: 0 0 0 5px rgba(47, 227, 208, .2);
}

.page-about .cover__legend {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-about .cover__figure {
  margin: 12px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: 2px;
  overflow: hidden;
}

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

.page-about .cover__side {
  padding-top: 4px;
}

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

.page-about .sync-list li {
  display: grid;
  gap: 3px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .sync-list li:first-child {
  border-top: 1px dashed var(--line-soft);
}

.page-about .sync-list strong {
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .sync-list span {
  font-size: 13px;
  line-height: 1.62;
  color: var(--mist);
}

.page-about .sync-list .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .cover__hint {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .cover__hint a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--signal);
  padding-bottom: 1px;
}

.page-about .cover__hint a:hover {
  color: var(--signal);
}

/* ---------- team ecosystem ---------- */

.page-about .eco {
  display: grid;
  gap: 12px;
}

.page-about .eco-node {
  padding: 15px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .eco-node--core {
  background: linear-gradient(115deg, rgba(255, 106, 43, .16), rgba(47, 227, 208, .09) 70%, rgba(14, 36, 56, .9));
  border-color: rgba(255, 106, 43, .42);
}

.page-about .eco-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  color: var(--paper);
}

.page-about .eco-node__text {
  margin: 7px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .eco-node ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .eco-node li {
  position: relative;
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--mist);
}

.page-about .eco-node li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--cyan);
  border-radius: 1px;
}

.page-about .eco-figure {
  margin: 14px 0 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

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

/* ---------- next links ---------- */

.page-about .about-next {
  display: grid;
  gap: 10px;
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .about-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-link:hover {
  border-color: var(--signal);
  background: rgba(255, 106, 43, .07);
}

.page-about .about-link__arrow {
  flex: none;
  color: var(--signal);
  font-size: 15px;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-link:hover .about-link__arrow {
  transform: translateX(4px);
}

/* ---------- responsive ---------- */

@media (min-width: 600px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stat {
    padding: 16px 18px 15px;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .about-stat:first-child {
    padding-left: 0;
  }

  .page-about .about-stat:last-child {
    border-right: 0;
  }

  .page-about .cover__nodes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .eco-node--core {
    grid-column: 1 / -1;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: 188px minmax(0, 1fr);
    gap: clamp(26px, 4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    flex-direction: column;
    overflow: visible;
    gap: 6px;
    padding: 0;
    margin: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding-left: 12px;
  }

  .page-about .about-rail .anchor-nav__link {
    border-color: transparent;
    border-radius: 2px;
    padding: 7px 10px;
    white-space: normal;
  }

  .page-about .about-rail .anchor-nav__link[aria-current="true"] {
    color: var(--paper);
    background: var(--signal-soft);
    border-color: var(--signal);
  }

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

  .page-about .about-sec__lead {
    font-size: 16px;
  }

  .page-about .cover {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(22px, 3vw, 34px);
  }

  .page-about .tiers {
    gap: 14px;
  }

  .page-about .eco-figure {
    margin-top: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .about-link__arrow,
  .page-about .filter-btn,
  .page-about .cover-node,
  .page-about .tl-item,
  .page-about .tier {
    transition: none;
  }
}
<<<END>>>