.page-about {
  --about-rail-w: 96px;
  --about-gap: clamp(22px, 3.4vw, 52px);
  --about-node-gap: clamp(56px, 9vw, 108px);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(255, 138, 61, .12), transparent 58%),
    radial-gradient(80% 70% at 0% 100%, rgba(43, 224, 184, .1), transparent 62%);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-hero .sec-kicker {
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.022em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-hero__lede::first-letter {
  color: var(--paper);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 8px 0 0;
  padding: 0;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
  list-style: none;
}

.page-about .about-fact {
  background: var(--ink-800);
  padding: 16px 18px 18px;
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 0 8px;
  border-left: 2px solid transparent;
  transition: background .24s ease, border-color .24s ease;
}

.page-about .about-fact:nth-child(odd) {
  border-left-color: var(--hair-amber);
}

.page-about .about-fact:nth-child(even) {
  border-left-color: var(--hair-cyan);
}

.page-about .about-fact:hover {
  background: var(--ink-700);
}

.page-about .about-fact dt {
  grid-column: 1 / -1;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  font-weight: 600;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-fact__unit {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- Shell: rail + stream ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  padding: clamp(40px, 7vw, 76px) 0 0;
}

.page-about .about-rail {
  position: sticky;
  top: calc(var(--bar) + 14px);
  z-index: 3;
  align-self: start;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 12px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
}

.page-about .about-rail__caption {
  display: none;
}

.page-about .about-rail__item {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 5px 9px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  color: var(--amber);
  border-color: var(--hair-amber);
  background: rgba(255, 138, 61, .08);
  outline: none;
}

.page-about .about-rail__item--soft {
  font-family: var(--font-body);
  letter-spacing: .04em;
  color: var(--cyan);
  border-color: transparent;
}

.page-about .about-rail__item--soft:hover,
.page-about .about-rail__item--soft:focus-visible {
  color: var(--cyan);
  border-color: var(--hair-cyan);
  background: rgba(43, 224, 184, .08);
}

.page-about .about-stream {
  display: grid;
  gap: var(--about-node-gap);
  min-width: 0;
}

/* ---------- Node ---------- */
.page-about .about-node {
  position: relative;
  scroll-margin-top: calc(var(--bar) + 90px);
  padding-left: 18px;
  border-left: 1px solid var(--hair);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--hair-strong);
  transform: rotate(45deg);
}

.page-about .about-node:nth-child(1)::before { border-color: var(--hair-amber); background: var(--amber); }
.page-about .about-node:nth-child(2)::before { border-color: var(--hair-cyan); background: var(--cyan); }
.page-about .about-node:nth-child(3)::before { border-color: rgba(255, 209, 102, .5); background: var(--gold); }
.page-about .about-node:nth-child(4)::before { border-color: var(--hair-cyan); background: var(--cyan); }
.page-about .about-node:nth-child(5)::before { border-color: var(--hair-amber); background: var(--amber); }
.page-about .about-node:nth-child(6)::before { border-color: var(--hair-cyan); background: var(--cyan); }
.page-about .about-node:nth-child(7)::before { border-color: var(--wine); background: var(--wine); }
.page-about .about-node:nth-child(8)::before { border-color: rgba(255, 209, 102, .5); background: var(--gold); }

.page-about .about-node__year {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .about-node:nth-child(even) .about-node__year {
  color: var(--cyan);
}

.page-about .about-node__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.018em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .about-node__lede {
  margin: 0 0 20px;
  max-width: 46ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
}

.page-about .about-node__body {
  display: grid;
  gap: 24px;
}

.page-about .about-node__body--tight {
  gap: 20px;
}

.page-about .about-node__text {
  display: grid;
  gap: 14px;
  max-width: 62ch;
}

.page-about .about-node__text p {
  margin: 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-node__figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-node__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
}

.page-about .about-node__figure figcaption {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- Steps (2021) ---------- */
.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-steps li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--ink-800);
  font-size: 15px;
  color: var(--paper);
}

.page-about .about-steps .mono {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
  min-width: 22px;
}

/* ---------- Wide nodes ---------- */
.page-about .about-node--wide {
  padding: clamp(22px, 3.4vw, 34px) clamp(18px, 3vw, 30px) clamp(26px, 3.6vw, 36px);
  border-left: none;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(20, 32, 43, .9), rgba(14, 22, 32, .92));
  overflow: hidden;
}

.page-about .about-node--wide::before {
  display: none;
}

.page-about .about-wide-media {
  margin: 0 0 26px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--hair);
}

.page-about .about-wide-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- Team ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-role {
  background: var(--ink-800);
  padding: 18px 18px 20px;
  display: grid;
  gap: 4px;
  border-left: 2px solid transparent;
  transition: background .24s ease, border-color .24s ease;
  outline: none;
}

.page-about .about-role:nth-child(1) { border-left-color: var(--amber); }
.page-about .about-role:nth-child(2) { border-left-color: var(--cyan); }
.page-about .about-role:nth-child(3) { border-left-color: var(--gold); }
.page-about .about-role:nth-child(4) { border-left-color: var(--teal); }

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  background: var(--ink-700);
}

.page-about .about-role__num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .about-role__name {
  margin: 6px 0 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .34s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .about-role:hover .about-role__desc,
.page-about .about-role:focus-visible .about-role__desc,
.page-about .about-role:focus-within .about-role__desc {
  max-height: 8em;
  opacity: 1;
  margin-top: 6px;
}

/* ---------- Archive ---------- */
.page-about .about-archive {
  display: grid;
  gap: 22px;
  margin-bottom: 28px;
}

.page-about .about-archive__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--hair);
}

.page-about .about-archive__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-archive__text {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-archive__text p {
  margin: 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--paper);
  max-width: 48ch;
}

/* ---------- Chart ---------- */
.page-about .about-chart-figure {
  margin: 0;
  padding: 18px 14px 8px;
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: var(--ink-900);
  display: grid;
  gap: 8px;
}

.page-about .about-chart-figure__cap {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
  text-transform: uppercase;
}

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

.page-about .about-chart__grid line {
  stroke: var(--hair);
  stroke-width: 1;
}

.page-about .about-chart__area {
  fill: url(#aboutChartFill);
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .about-chart__dots circle {
  fill: var(--ink-900);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .about-chart__dots circle.is-now {
  fill: var(--amber);
  stroke: var(--amber);
}

.page-about .about-chart__labels text {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
}

/* ---------- Partners ---------- */
.page-about .about-partner-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 420px;
}

.page-about .about-partner-figure {
  background: var(--ink-800);
  padding: 16px 18px;
  display: grid;
  gap: 4px;
}

.page-about .about-partner-figure .mono {
  font-size: 30px;
  font-weight: 600;
  color: var(--amber);
  line-height: 1;
}

.page-about .about-partner-figure:last-child .mono {
  color: var(--cyan);
}

.page-about .about-partner-figure span:last-child {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-node__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}

/* ---------- Next ---------- */
.page-about .about-next {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin-top: 6px;
}

.page-about .about-next__item {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--radius);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--hair);
  transition: border-color .24s ease, transform .24s ease;
}

.page-about .about-next__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: var(--radius) 0 0 var(--radius);
  background: var(--cyan);
}

.page-about .about-next__item:nth-child(2)::before { background: var(--amber); }
.page-about .about-next__item:nth-child(3)::before { background: var(--gold); }

.page-about .about-next__item:hover {
  border-color: var(--hair-cyan);
  transform: translateY(-2px);
}

.page-about .about-next__item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: .01em;
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

/* ---------- Reveal affordance ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

/* ---------- Wider screens ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-node__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .about-node__body--tight {
    grid-template-columns: minmax(0, 1fr) minmax(0, .6fr);
  }

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

  .page-about .about-archive {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: center;
    gap: 34px;
  }

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

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

  .page-about .about-rail {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    padding: 16px 10px 18px;
    text-align: left;
  }

  .page-about .about-rail__caption {
    display: block;
    font-size: 10px;
    letter-spacing: .22em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 0 9px 10px;
    border-bottom: 1px solid var(--hair);
    margin-bottom: 8px;
  }

  .page-about .about-rail__item {
    display: block;
    padding: 7px 9px;
    font-size: 13px;
  }

  .page-about .about-rail__item--soft {
    font-size: 13px;
    color: var(--muted);
    opacity: .82;
  }

  .page-about .about-rail__item--soft:hover,
  .page-about .about-rail__item--soft:focus-visible {
    color: var(--cyan);
    opacity: 1;
  }

  .page-about .about-node {
    padding-left: clamp(20px, 2.6vw, 34px);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 22ch;
  }

  .page-about .about-node--wide {
    padding: 38px 40px 42px;
  }
}

/* ---------- Hover-less fallbacks ---------- */
@media (hover: none), (max-width: 640px) {
  .page-about .about-role__desc {
    max-height: 10em;
    opacity: 1;
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role__desc,
  .page-about .about-next__item,
  .page-about .about-rail__item,
  .page-about .about-fact {
    transition-duration: .12s;
  }

  .page-about .about-next__item:hover {
    transform: none;
  }
}
<<<END>>>

我已经按要求生成完成了。