.page-about {
  background:
    radial-gradient(1100px 620px at 88% -8%, rgba(36, 42, 92, 0.55), transparent 62%),
    radial-gradient(760px 520px at 4% 46%, rgba(74, 31, 44, 0.42), transparent 66%),
    var(--ink-950);
  color: var(--ivory);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0;
}

.page-about figure {
  margin: 0;
}

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

.page-about a {
  color: var(--aqua);
  text-decoration: none;
}

.page-about a:hover,
.page-about a:focus-visible {
  color: var(--aqua-soft);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(24px, 4vw, 48px) clamp(40px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(36, 42, 92, 0.34), rgba(6, 24, 20, 0) 58%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-hero__text h1 {
  font-size: clamp(34px, 8.4vw, 72px);
  margin-block: 14px 20px;
  color: var(--ivory);
}

.page-about .about-hero__lead {
  max-width: 40ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  padding: 14px 0 12px;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__facts li:nth-child(odd) {
  padding-right: 14px;
}

.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--aqua);
  line-height: 1;
}

.page-about .about-hero__facts span {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.02em;
}

.page-about .about-hero__figure {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-950));
  overflow: hidden;
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(47, 243, 208, 0.09) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(to bottom, rgba(47, 243, 208, 0.09) 0 1px, transparent 1px 56px);
  opacity: 0.55;
}

.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-hero__figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--aqua-soft);
  background: rgba(6, 24, 20, 0.82);
  border-top: 1px solid var(--line-lit);
  border-right: 1px solid var(--line-lit);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__cols {
  display: grid;
  gap: clamp(16px, 2.6vw, 32px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-origin__cols .prose {
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ivory);
}

.page-about .about-origin__aside {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--flare);
  background: rgba(11, 42, 35, 0.68);
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-origin__aside .tag {
  margin-right: 10px;
}

/* ---------- 阶段脊线 ---------- */
.page-about .about-track {
  border-bottom: 1px solid var(--line);
}

.page-about .about-track__layout {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-track__index-title {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin: 0 0 10px;
}

.page-about .about-track__index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

.page-about .about-track__index li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .about-track__index a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  background: var(--ink-900);
  color: var(--mist);
  font-size: 13px;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-track__index a .mono {
  font-size: 11px;
  color: var(--aqua);
  letter-spacing: 0.08em;
}

.page-about .about-track__index a:hover,
.page-about .about-track__index a:focus-visible {
  border-color: var(--line-lit);
  color: var(--ivory);
}

.page-about .about-track__spine {
  position: relative;
  padding-left: 26px;
}

.page-about .about-track__spine::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--aqua), rgba(47, 243, 208, 0.16) 72%, transparent);
}

.page-about .stage {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  margin-bottom: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  background: var(--ink-900);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .stage::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 30px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--aqua);
  background: var(--ink-950);
  transform: rotate(45deg);
}

.page-about .stage:hover {
  transform: translateY(-2px);
  border-color: var(--line-lit);
}

.page-about .stage__num {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--flare);
}

.page-about .stage h3 {
  font-size: clamp(20px, 2.6vw, 27px);
  margin-bottom: 10px;
  color: var(--ivory);
}

.page-about .stage__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .stage__more {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .stage__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--aqua);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .stage__more summary::-webkit-details-marker {
  display: none;
}

.page-about .stage__more summary::before {
  content: "+";
  display: inline-flex;
  width: 18px;
  height: 18px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-lit);
  font-size: 12px;
}

.page-about .stage__more[open] summary::before {
  content: "–";
}

.page-about .stage__more dl {
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .stage__more dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .stage__more dd {
  margin: 2px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ivory);
}

/* ---------- 生产链 ---------- */
.page-about .about-chain {
  background: linear-gradient(180deg, rgba(74, 31, 44, 0.34), rgba(11, 42, 35, 0.1));
  border-bottom: 1px solid var(--line);
}

.page-about .about-chain__figure {
  border: 1px solid var(--line);
  margin-bottom: clamp(24px, 3.4vw, 40px);
  overflow: hidden;
}

.page-about .about-chain__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .about-chain__grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .chain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
  display: grid;
  gap: 1px;
}

.page-about .chain-list li {
  background: var(--ink-900);
  padding: 18px;
  display: grid;
  gap: 8px;
}

.page-about .chain-list__time {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--aqua);
}

.page-about .chain-list h3 {
  font-size: 19px;
  margin-bottom: 6px;
  color: var(--ivory);
}

.page-about .chain-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-chain__aside {
  border-left: 2px solid var(--aqua);
  padding-left: 18px;
}

.page-about .about-chain__aside p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-chain__note {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--aqua-soft);
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .about-team__intro h2 {
  font-size: clamp(24px, 4.2vw, 42px);
  margin-block: 10px 16px;
}

.page-about .about-team__intro p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 46ch;
}

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

.page-about .about-team__figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .network {
  list-style: none;
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .network__node {
  background: var(--ink-900);
  padding: 18px 18px 20px;
  position: relative;
  transition: background var(--dur) var(--ease);
}

.page-about .network__node:hover,
.page-about .network__node:focus-within {
  background: var(--ink-800);
}

.page-about .network__dot {
  display: block;
  width: 8px;
  height: 8px;
  margin-bottom: 12px;
  background: var(--aqua);
  box-shadow: 0 0 0 3px rgba(47, 243, 208, 0.14);
}

.page-about .network__node h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--ivory);
}

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

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  border-bottom: 1px solid var(--line);
}

.page-about .about-figures {
  list-style: none;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures li {
  background: var(--ink-900);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-figures b {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--aqua);
}

.page-about .about-figures li:nth-child(2) b { color: var(--aqua-soft); }
.page-about .about-figures li:nth-child(3) b { color: var(--flare); }

.page-about .about-figures span {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-coverage__cols {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-coverage__cols article {
  background: var(--ink-900);
  padding: 20px 18px 22px;
}

.page-about .about-coverage__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-coverage__cols h3 {
  font-size: 19px;
  margin-bottom: 10px;
  color: var(--ivory);
}

.page-about .about-coverage__cols p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
}

.page-about .about-coverage__foot {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  border-left: 1px solid var(--line-lit);
  padding-left: 16px;
}

/* ---------- 打磨 ---------- */
.page-about .about-craft {
  background: linear-gradient(180deg, rgba(36, 42, 92, 0.4), rgba(6, 24, 20, 0.1));
  border-bottom: 1px solid var(--line);
}

.page-about .craft-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .craft-list li {
  border: 1px solid var(--line);
  background: rgba(11, 42, 35, 0.7);
  padding: 18px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .craft-list li:hover {
  transform: translateY(-2px);
  border-color: var(--line-lit);
}

.page-about .craft-list__num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--flare);
}

.page-about .craft-list h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--ivory);
}

.page-about .craft-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(48px, 6vw, 88px);
}

.page-about .about-next__cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-next__card {
  position: relative;
  display: block;
  background: var(--ink-900);
  padding: clamp(20px, 3vw, 30px);
  color: var(--ivory);
  transition: background var(--dur) var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--ink-800);
  color: var(--ivory);
}

.page-about .about-next__card p.mono {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--aqua);
  text-transform: uppercase;
}

.page-about .about-next__card h3 {
  font-size: clamp(20px, 2.8vw, 26px);
  margin-bottom: 10px;
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--mist);
  max-width: 40ch;
}

.page-about .about-next__go {
  display: block;
  margin-top: 16px;
  font-family: var(--font-mono);
  color: var(--aqua);
}

.page-about .about-next__links {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-next__links a {
  margin-inline: 4px;
  border-bottom: 1px solid rgba(47, 243, 208, 0.45);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 3px;
}

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

  .page-about .about-hero__facts li {
    border-bottom: none;
    border-right: 1px solid var(--line);
    padding: 14px 14px 12px;
  }

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

  .page-about .about-hero__facts li:last-child {
    border-right: none;
  }

  .page-about .chain-list li {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-origin__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-track__layout {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-track__index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-track__index ol {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
  }

  .page-about .about-track__index a {
    width: 100%;
    white-space: normal;
  }

  .page-about .about-chain__grid {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 44px);
    align-items: start;
  }

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

  .page-about .network {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .craft-list li,
  .page-about .network__node,
  .page-about .about-next__card {
    transition: opacity var(--dur) var(--ease);
    transform: none;
  }
}
<<<PAGE_CSS_END>>>