.page-about {
  --about-tick: clamp(54px, 9vw, 92px);
  --about-gap: clamp(32px, 5vw, 64px);
  --about-sec: clamp(42px, 6vw, 78px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(34px, 5vw, 62px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(24px, 4vw, 46px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 60px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  line-height: .92;
  letter-spacing: -.01em;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 34em;
}

/* 档案数值条 */
.page-about .about-fact {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-fact__title {
  margin: 0;
  padding: 10px 0;
  color: var(--mist);
}

.page-about .about-fact__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-fact__k {
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-fact__v {
  font-family: var(--font-num);
  font-size: clamp(19px, 2.2vw, 25px);
  line-height: 1;
  color: var(--butter);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, .85fr);
  }
}

/* ---------- 主体栅格 ---------- */
.page-about .about-layout {
  padding-top: clamp(38px, 5vw, 76px);
  padding-bottom: clamp(56px, 8vw, 110px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

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

.page-about .about-toc__title {
  margin: 0 0 12px;
  color: var(--mist);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-toc__link {
  display: block;
  margin-left: -1px;
  padding: 9px 0 9px 14px;
  border-left: 2px solid transparent;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  border-left-color: var(--orange);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--butter);
  border-left-color: var(--butter);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: clamp(150px, 16vw, 214px) minmax(0, 1fr);
  }
  .page-about .about-toc {
    display: block;
    position: sticky;
    top: clamp(24px, 7vh, 84px);
    align-self: start;
  }
}

/* ---------- 区块 ---------- */
.page-about .about-sec {
  padding-block: var(--about-sec);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: none;
}

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

.page-about .about-sec .section__intro {
  max-width: 40em;
}

/* ---------- 记录边界 ---------- */
.page-about .about-statement {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-statement__cell {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-statement__no {
  margin: 0 0 10px;
  color: var(--teal);
}

.page-about .about-statement__cell .prose {
  margin: 0;
  max-width: 36em;
}

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

/* ---------- 沿革时间线 ---------- */
.page-about .about-lineage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: calc(var(--about-tick) + 8px);
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-tick) minmax(0, 1fr);
  column-gap: clamp(16px, 2.6vw, 36px);
  padding-bottom: clamp(30px, 4vw, 50px);
}

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

.page-about .about-tl__item::after {
  content: "";
  position: absolute;
  left: calc(var(--about-tick) + 4px);
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--night);
  border: 1px solid var(--mist);
  transition: background-color 220ms ease, border-color 220ms ease;
}

.page-about .about-tl__item.is-revealed::after {
  background: var(--butter);
  border-color: var(--butter);
}

.page-about .about-tl__item:hover::after {
  border-color: var(--orange);
}

.page-about .about-tl__year {
  text-align: right;
  font-size: clamp(17px, 2.2vw, 25px);
  line-height: 1.1;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
  transition: color 200ms ease;
}

.page-about .about-tl__item:hover .about-tl__year {
  color: var(--white);
}

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

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(18px, 2.3vw, 24px);
  letter-spacing: .02em;
  color: var(--white);
}

.page-about .about-tl__text {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-tl__note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: var(--teal);
  max-width: 40em;
}

.page-about .about-tl__note a {
  color: var(--teal);
}

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

.page-about .about-lineage__fig .figure__media {
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

@media (min-width: 1000px) {
  .page-about .about-lineage {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 330px);
    align-items: start;
  }
  .page-about .about-lineage__fig {
    position: sticky;
    top: clamp(24px, 7vh, 84px);
  }
}

/* ---------- 小组构成 ---------- */
.page-about .about-crew {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-crew__unit {
  padding: clamp(18px, 2.4vw, 28px) clamp(4px, 1.2vw, 18px) clamp(20px, 2.6vw, 30px) 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-crew__no {
  display: block;
  color: var(--teal);
}

.page-about .about-crew__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(17px, 2.1vw, 21px);
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .about-crew__count {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-num);
  font-size: clamp(38px, 5vw, 58px);
  line-height: .9;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .about-crew__unitlabel {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-crew__desc {
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-crew__fig {
  margin: clamp(30px, 4vw, 52px) 0 0;
}

.page-about .about-crew__fig .figure__media {
  aspect-ratio: 14 / 9;
  overflow: hidden;
}

@media (min-width: 640px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-crew__unit {
    padding-right: clamp(16px, 2vw, 28px);
  }
  .page-about .about-crew__unit:nth-child(odd) {
    border-right: 1px solid var(--line);
  }
}

@media (min-width: 1080px) {
  .page-about .about-crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-crew__unit {
    border-right: 1px solid var(--line);
    padding-left: clamp(14px, 1.6vw, 22px);
  }
  .page-about .about-crew__unit:first-child {
    padding-left: 0;
  }
  .page-about .about-crew__unit:last-child {
    border-right: none;
  }
}

/* ---------- 流程链 ---------- */
.page-about .about-pipeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-flow {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-flow__spine {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-flow__node rect {
  fill: var(--night);
  stroke: var(--mist);
  stroke-width: 1;
}

.page-about .about-flow__node--roll rect {
  fill: var(--butter);
  stroke: var(--butter);
}

.page-about .about-flow text {
  fill: var(--mist);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 28px);
}

.page-about .about-steps__item {
  position: relative;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-steps__no {
  color: var(--butter);
}

.page-about .about-steps__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(16px, 2vw, 19px);
  letter-spacing: .04em;
  color: var(--white);
}

.page-about .about-steps__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-pipeline__tail {
  margin-top: clamp(24px, 3.4vw, 38px);
  padding-top: clamp(16px, 2vw, 24px);
  border-top: 1px solid var(--line-strong);
  max-width: 38em;
}

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

.page-about .about-pipeline__fig .figure__media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 36px);
  }
}

@media (min-width: 860px) {
  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 1fr) minmax(200px, 286px);
    align-items: start;
  }
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 更正路径 ---------- */
.page-about .about-correct {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-correct__text {
  max-width: 38em;
}

.page-about .about-correct__text p {
  margin: 0 0 16px;
}

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

.page-about .about-correct__req {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
  align-self: start;
}

.page-about .about-correct__reqtitle {
  margin: 0 0 14px;
  color: var(--mist);
}

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

.page-about .about-correct__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--white);
}

.page-about .about-correct__list li .index {
  color: var(--teal);
  flex: none;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
}

@media (min-width: 900px) {
  .page-about .about-correct {
    grid-template-columns: minmax(0, 1.6fr) minmax(260px, 1fr);
  }
}

/* ---------- 通用图片行为 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
<<<END>>>