.page-about {
  --about-rail: 228px;
  --about-gutter: 56px;
}

.page-about .about-hero {
  background: var(--paper);
  padding: 32px 0 clamp(64px, 11vw, 120px);
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(36px, 7vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 44px;
}

.page-about .about-hero__lede .display {
  margin: 18px 0 0;
  max-width: 15ch;
}

.page-about .about-hero__lede .lede {
  margin: 26px 0 0;
  max-width: 48ch;
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.page-about .about-hero__facts > div {
  padding: 0 16px;
  border-left: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-hero__facts > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-55);
  line-height: 1.5;
}

.page-about .about-hero__facts dd {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(230px, 0.75fr);
    gap: 72px;
    align-items: end;
  }

  .page-about .about-hero__facts {
    grid-template-columns: 1fr;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding-top: 0;
    padding-left: 32px;
  }

  .page-about .about-hero__facts > div {
    padding: 0 0 22px;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .page-about .about-hero__facts > div:last-child {
    padding-bottom: 0;
    border-bottom: 0;
  }
}

/* ---------- 通用区块头 ---------- */

.page-about .about-head {
  display: grid;
  gap: 14px;
  max-width: 66ch;
  margin-bottom: clamp(36px, 6vw, 64px);
}

.page-about .about-head .lede {
  margin: 0;
  max-width: 56ch;
}

/* ---------- 01 三个小组 ---------- */

.page-about .about-crew {
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-crew__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  position: relative;
}

.page-about .about-crew__item {
  position: relative;
  padding: 0 0 36px 40px;
}

.page-about .about-crew__item:last-child {
  padding-bottom: 0;
}

.page-about .about-crew__dot {
  position: absolute;
  left: 4px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-pill);
  z-index: 1;
}

.page-about .about-crew__dot--jade { background: var(--jade); }
.page-about .about-crew__dot--gold { background: var(--gold); }
.page-about .about-crew__dot--orange { background: var(--orange); }

.page-about .about-crew__flow::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 20px;
  width: 1px;
  background: var(--line);
}

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

.page-about .about-crew__item h3 {
  margin: 0 0 10px;
}

.page-about .about-crew__item p {
  margin: 0;
  color: var(--ink-70);
  max-width: 52ch;
}

.page-about .about-crew__handoff {
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--ink-70);
  max-width: 60ch;
}

@media (min-width: 860px) {
  .page-about .about-crew__flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-crew__flow::before {
    left: calc(100% / 6);
    right: calc(100% / 6);
    top: 15px;
    bottom: auto;
    height: 1px;
    width: auto;
    background: linear-gradient(90deg, var(--jade), var(--gold) 50%, var(--orange));
  }

  .page-about .about-crew__item {
    padding: 0 28px;
    text-align: center;
  }

  .page-about .about-crew__dot {
    position: absolute;
    left: 50%;
    top: 9px;
    transform: translateX(-50%);
  }

  .page-about .about-crew__item p {
    max-width: none;
  }
}

/* ---------- 02 时间线 ---------- */

.page-about .about-path {
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-path__figure {
  margin: 0 0 clamp(44px, 7vw, 76px);
  border-radius: var(--radius-l);
  overflow: hidden;
  aspect-ratio: 21 / 9;
  background: var(--butter);
}

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

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

.page-about .about-path__item {
  position: relative;
  padding: 0 0 44px 32px;
}

.page-about .about-path__item:last-child {
  padding-bottom: 0;
}

.page-about .about-path__dot {
  position: absolute;
  left: 4px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--gold);
  z-index: 1;
}

.page-about .about-path__rail {
  position: absolute;
  left: 8px;
  top: 24px;
  bottom: -6px;
  width: 1px;
  background: var(--line);
}

.page-about .about-path__item:last-child .about-path__rail {
  display: none;
}

.page-about .about-path__year {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 9vw, 68px);
  line-height: 1;
  color: var(--red);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-path__body {
  margin-top: 14px;
}

.page-about .about-path__body h3 {
  margin: 0 0 10px;
}

.page-about .about-path__body p {
  margin: 0;
  color: var(--ink-70);
  max-width: 54ch;
}

@media (min-width: 800px) {
  .page-about .about-path__item {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: var(--about-gutter);
    padding: 0 0 60px;
    align-items: start;
  }

  .page-about .about-path__dot {
    left: calc(200px + 28px - 4px);
    top: 20px;
  }

  .page-about .about-path__rail {
    left: calc(200px + 28px);
    top: 36px;
    bottom: -8px;
  }

  .page-about .about-path__year {
    text-align: right;
    font-size: clamp(56px, 6vw, 84px);
  }

  .page-about .about-path__body {
    margin-top: 6px;
  }
}

/* ---------- 03 三道确认 ---------- */

.page-about .about-verify {
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-verify__grid {
  display: grid;
  gap: 48px;
}

.page-about .about-verify__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 32px;
}

.page-about .about-verify__steps li {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-verify__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-dark);
  margin-bottom: 10px;
}

.page-about .about-verify__steps h3 {
  margin: 0 0 10px;
}

.page-about .about-verify__steps p {
  margin: 0;
  color: var(--ink-70);
  max-width: 52ch;
}

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

.page-about .about-verify__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--white);
}

.page-about .about-verify__figure figcaption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--ink-55);
  line-height: 1.7;
}

.page-about .about-verify__quarter {
  margin: clamp(36px, 6vw, 56px) 0 0;
  padding: 24px 28px;
  border-left: 3px solid var(--jade);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: var(--butter);
  color: var(--ink-70);
  max-width: 72ch;
}

@media (min-width: 900px) {
  .page-about .about-verify__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    gap: 64px;
    align-items: start;
  }
}

/* ---------- 04 工具 ---------- */

.page-about .about-tools {
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-tools__grid {
  display: grid;
  gap: 44px;
}

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

.page-about .about-tools__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background: var(--butter);
}

.page-about .about-tools__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.page-about .about-tools__list li {
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .about-tools__era {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .about-tools__list h3 {
  margin: 0 0 8px;
}

.page-about .about-tools__list p {
  margin: 0;
  color: var(--ink-70);
  max-width: 48ch;
}

@media (min-width: 900px) {
  .page-about .about-tools__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 64px;
    align-items: start;
  }
}

/* ---------- 05 研究协作 ---------- */

.page-about .about-research {
  padding: clamp(56px, 9vw, 104px) 0;
}

.page-about .about-research__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 34px;
}

.page-about .about-research__points li {
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-research__points h3 {
  margin: 0 0 10px;
}

.page-about .about-research__points p {
  margin: 0;
  color: var(--ink-70);
}

.page-about .about-research__points a {
  color: var(--red);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-about .about-research__points a:hover {
  color: var(--red-deep);
}

.page-about .about-research__tail {
  margin: clamp(32px, 5vw, 48px) 0 0;
  color: var(--ink-55);
  max-width: 62ch;
}

@media (min-width: 780px) {
  .page-about .about-research__points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 44px;
  }
}

/* ---------- 06 共建 ---------- */

.page-about .about-join {
  padding: clamp(56px, 9vw, 96px) 0;
}

.page-about .about-join__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-join__lede .sec-index {
  color: var(--gold);
}

.page-about .about-join__lede .h-sec {
  color: var(--paper);
  margin: 16px 0 0;
}

.page-about .about-join__lede p {
  margin: 20px 0 0;
  color: var(--paper-70);
  max-width: 54ch;
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-start;
}

@media (min-width: 860px) {
  .page-about .about-join__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    gap: 64px;
    align-items: end;
  }

  .page-about .about-join__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}
<<<END>>>