.page-about {
  --about-pad: clamp(56px, 7vw, 108px);
  --about-hair: 1px solid var(--c-moss);
  background: var(--c-ink);
  color: var(--c-text);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  color: var(--c-mist);
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 0;
}

.page-about h1 {
  font-size: clamp(2.2rem, 1.2rem + 4.6vw, 4.4rem);
  letter-spacing: -0.035em;
  margin-block: 14px 20px;
}

.page-about h2 {
  font-size: var(--fs-700);
  margin-block: 10px 18px;
}

.page-about h3 {
  font-size: var(--fs-500);
  margin-block: 0 10px;
}

.page-about p {
  line-height: 1.78;
  margin: 0 0 14px;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

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

.page-about figcaption {
  font-size: var(--fs-200);
  color: var(--c-silver);
  margin-block-start: 10px;
  line-height: 1.6;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-block-start: calc(-1 * var(--header-h));
  padding-block: calc(var(--header-h) + 36px) clamp(44px, 6vw, 84px);
  background:
    radial-gradient(120% 88% at 88% -12%, rgba(200, 255, 61, 0.16), transparent 62%),
    radial-gradient(96% 80% at 4% 108%, rgba(255, 107, 44, 0.12), transparent 64%),
    var(--c-ink);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-lime), var(--c-mint), var(--c-orange), transparent);
  opacity: 0.5;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-hero__copy .eyebrow {
  color: var(--c-lime);
}

.page-about .about-hero__lede {
  font-size: var(--fs-400);
  color: var(--c-text);
  max-width: 46ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: 22px;
}

.page-about .about-hero__figure {
  margin: 0;
  order: -1;
}

.page-about .about-hero__figure img {
  aspect-ratio: 3 / 2;
  border-radius: 26px 6px 26px 6px;
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-hero__cap {
  display: block;
  padding-inline-start: 12px;
  border-inline-start: 2px solid var(--c-orange);
}

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--c-moss);
  border: var(--about-hair);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .about-fig {
  background: var(--c-pine);
  padding: 16px 16px 18px;
}

.page-about .about-fig dt {
  font-size: var(--fs-100);
  letter-spacing: 0.12em;
  color: var(--c-dim);
  text-transform: uppercase;
}

.page-about .about-fig dd {
  margin: 8px 0 0;
  font-size: var(--fs-500);
  color: var(--c-mist);
  font-weight: 600;
}

.page-about .about-fig dd .num {
  color: var(--c-lime);
  font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2.1rem);
  margin-inline-end: 2px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding-block: var(--about-pad);
  border-block-end: var(--about-hair);
}

.page-about .about-origin__aside {
  border-inline-start: 2px solid var(--c-moss);
  padding-inline-start: 16px;
  transition: border-color 240ms var(--ease);
}

.page-about .about-origin.is-current .about-origin__aside {
  border-inline-start-color: var(--c-lime);
}

.page-about .about-origin__note {
  font-size: var(--fs-200);
  color: var(--c-silver);
  max-width: 30ch;
}

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

.page-about .about-line {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding-block: 20px;
  border-block-start: var(--about-hair);
}

.page-about .about-line:last-child {
  border-block-end: var(--about-hair);
}

.page-about .about-line__no {
  margin: 0;
  font-size: var(--fs-200);
  color: var(--c-orange);
  padding-block-start: 4px;
}

.page-about .about-line p:last-child {
  margin: 0;
  font-size: var(--fs-300);
  color: var(--c-silver);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding-block: var(--about-pad);
  background: linear-gradient(180deg, var(--c-ink), var(--c-charcoal) 45%, var(--c-ink));
}

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

.page-about .about-index {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index a {
  display: inline-block;
  padding: 7px 13px;
  border: var(--about-hair);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  color: var(--c-silver);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--c-ink);
  background: var(--c-lime);
  border-color: var(--c-lime);
}

.page-about .about-timeline__readout {
  display: none;
  margin-block-start: 20px;
  padding-block-start: 14px;
  border-block-start: var(--about-hair);
  font-size: var(--fs-100);
  color: var(--c-dim);
}

.page-about .about-timeline__readout-label {
  display: block;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-block-end: 6px;
}

.page-about .about-timeline__readout .num {
  color: var(--c-mint);
  font-size: var(--fs-200);
}

.page-about .about-timeline__stream {
  position: relative;
  padding-inline-start: 20px;
}

.page-about .about-timeline__stream::before {
  content: "";
  position: absolute;
  inset-block: 6px 6px;
  inset-inline-start: 3px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--c-moss) 8%, var(--c-moss) 92%, transparent);
}

.page-about .about-year {
  position: relative;
  padding-block: 6px 30px;
}

.page-about .about-year::before {
  content: "";
  position: absolute;
  inset-inline-start: -20px;
  top: 22px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-moss);
  transition: background 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-year.is-current::before {
  background: var(--c-lime);
  box-shadow: 0 0 0 5px rgba(200, 255, 61, 0.14);
}

.page-about .about-year__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.6rem, 1.6rem + 4.4vw, 4.4rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--c-moss);
  margin: 0 0 8px;
  transition: color 240ms var(--ease);
}

.page-about .about-year.is-current .about-year__num {
  color: var(--c-lime);
}

.page-about .about-year__title {
  font-size: var(--fs-600);
  color: var(--c-mist);
  margin-block-end: 10px;
}

.page-about .about-year p:last-child {
  color: var(--c-silver);
  max-width: 60ch;
}

.page-about .about-timeline__figure {
  margin: 8px 0 34px;
}

.page-about .about-timeline__figure img {
  aspect-ratio: 4 / 5;
  border-radius: 4px 30px 4px 30px;
  border: var(--about-hair);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-pad);
  border-block-start: var(--about-hair);
}

.page-about .about-team__head {
  max-width: 62ch;
}

.page-about .about-team__intro {
  color: var(--c-silver);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 40px);
  margin-block-start: 30px;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure img {
  aspect-ratio: 3 / 2;
  border-radius: 22px 4px 22px 4px;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
}

.page-about .about-roles {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-role {
  background: var(--c-pine);
  border: var(--about-hair);
  border-radius: var(--r-md);
  padding: 16px 18px;
  transition: border-color 200ms var(--ease);
}

.page-about .about-role[open] {
  border-color: rgba(200, 255, 61, 0.45);
}

.page-about .about-role summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-role summary:focus-visible {
  outline: 2px solid var(--c-mint);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-about .about-role__num {
  font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.1rem);
  font-weight: 700;
  color: var(--c-lime);
  min-width: 2.4ch;
}

.page-about .about-role__name {
  font-size: var(--fs-400);
  font-weight: 600;
  color: var(--c-mist);
}

.page-about .about-role p {
  margin: 12px 0 0;
  font-size: var(--fs-300);
  color: var(--c-silver);
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  padding-block: var(--about-pad);
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(117, 230, 193, 0.08), transparent 70%),
    var(--c-charcoal);
  border-block: var(--about-hair);
}

.page-about .about-process__head {
  max-width: 58ch;
}

.page-about .about-process__head p:last-child {
  color: var(--c-silver);
}

.page-about .about-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-moss);
  border: var(--about-hair);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-step {
  background: var(--c-ink);
  padding: 20px 18px 22px;
}

.page-about .about-step__no {
  font-size: var(--fs-200);
  color: var(--c-orange);
  margin: 0 0 10px;
}

.page-about .about-step h3 {
  font-size: var(--fs-400);
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: 0;
  margin-block-end: 8px;
}

.page-about .about-step p:last-child {
  margin: 0;
  font-size: var(--fs-300);
  color: var(--c-silver);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  padding-block: var(--about-pad);
}

.page-about .about-network__body p {
  color: var(--c-silver);
}

.page-about .about-network__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-network__list li {
  display: grid;
  gap: 4px;
  padding-block-end: 12px;
  border-block-end: var(--about-hair);
}

.page-about .about-network__list strong {
  font-family: var(--font-mono);
  font-size: var(--fs-200);
  letter-spacing: 0.06em;
  color: var(--c-mint);
  font-weight: 600;
}

.page-about .about-network__list span {
  font-size: var(--fs-300);
  color: var(--c-silver);
}

.page-about .about-network__cta {
  margin-block-start: 22px;
  font-size: var(--fs-300);
}

.page-about .about-network__cta a {
  color: var(--c-lime);
  text-decoration: none;
  border-block-end: 1px solid var(--c-moss);
  padding-block-end: 1px;
}

.page-about .about-network__cta a:hover,
.page-about .about-network__cta a:focus-visible {
  border-block-end-color: var(--c-lime);
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-net {
  width: 100%;
  height: auto;
  display: block;
  background: radial-gradient(60% 60% at 50% 50%, rgba(16, 35, 28, 0.9), transparent 72%);
}

.page-about .about-net__lines line {
  stroke: var(--c-moss);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.page-about .about-net__node circle {
  fill: var(--c-pine);
  stroke: var(--c-moss);
  stroke-width: 1.5;
  transition: fill 200ms var(--ease), stroke 200ms var(--ease);
}

.page-about .about-net__node text {
  fill: var(--c-silver);
  font-family: var(--font-body);
  font-size: 15px;
  text-anchor: middle;
  transition: fill 200ms var(--ease);
}

.page-about .about-net__node--core circle {
  fill: rgba(200, 255, 61, 0.1);
  stroke: var(--c-lime);
}

.page-about .about-net__node--core text {
  fill: var(--c-lime);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
}

.page-about .about-net__node:hover circle,
.page-about .about-net__node:focus-visible circle {
  fill: rgba(200, 255, 61, 0.18);
  stroke: var(--c-lime);
}

.page-about .about-net__node:hover text,
.page-about .about-net__node:focus-visible text {
  fill: var(--c-mist);
}

.page-about .about-net__node:focus-visible {
  outline: none;
}

/* ---------- 联系收束 ---------- */
.page-about .about-contact {
  padding-block: var(--about-pad) calc(var(--about-pad) + 20px);
  background:
    linear-gradient(180deg, transparent, rgba(255, 107, 44, 0.06)),
    var(--c-pine);
  border-block-start: var(--about-hair);
}

.page-about .about-contact__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
}

.page-about .about-contact__copy p {
  color: var(--c-silver);
  max-width: 52ch;
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-block-start: 20px;
}

.page-about .about-contact__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--c-moss);
  border: var(--about-hair);
  border-radius: var(--r-md);
  overflow: hidden;
  align-content: start;
}

.page-about .about-contact__list li {
  background: var(--c-ink);
  padding: 16px 18px;
  display: grid;
  gap: 6px;
}

.page-about .about-contact__key {
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: 0.1em;
  color: var(--c-orange);
  text-transform: uppercase;
}

.page-about .about-contact__val {
  font-size: var(--fs-300);
  color: var(--c-text);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline__readout {
    display: block;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-hero__figure {
    order: 0;
  }

  .page-about .about-hero__figures {
    grid-column: 1 / -1;
    margin-block-start: 10px;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__index {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .about-index {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-index a {
    background: none;
    border: 0;
    padding: 0;
    font-size: var(--fs-200);
    border-inline-start: 1px solid var(--c-moss);
    padding-inline-start: 12px;
    border-radius: 0;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    color: var(--c-lime);
    background: none;
    border-inline-start-color: var(--c-lime);
  }

  .page-about .about-timeline__stream {
    padding-inline-start: 34px;
  }

  .page-about .about-year::before {
    inset-inline-start: -34px;
    top: 30px;
    width: 9px;
    height: 9px;
  }

  .page-about .about-year {
    padding-block: 10px 44px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

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

  .page-about .about-network__body {
    order: 2;
  }

  .page-about .about-network__figure {
    order: 1;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-contact__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lede {
    font-size: var(--fs-500);
  }

  .page-about .about-year_
  .page-about .about-year p:last-child {
    font-size: var(--fs-400);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-year__num,
  .page-about .about-year::before,
  .page-about .about-index a,
  .page-about .about-net__node circle,
  .page-about .about-net__node text {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
</main>