.page-about {
  background: var(--night);
  color: var(--cold);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(36px, 6vw, 88px) clamp(40px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(47, 167, 154, 0.16), transparent 62%),
    radial-gradient(90% 70% at 4% 100%, rgba(232, 179, 58, 0.09), transparent 60%);
  overflow: hidden;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(30px, 4vw, 64px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(30px, 7vw, 56px);
  max-width: 20ch;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--gold);
}

.page-about .ab-lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.82);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
  align-self: end;
}

.page-about .ab-stat {
  padding: 18px 16px 20px;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .ab-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(232, 241, 236, 0.7);
}

@media (min-width: 960px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 通用正文 ---------- */
.page-about .ab-text {
  margin: 0 0 20px;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.84);
}

.page-about .ab-rail {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}

.page-about .ab-rail .v-label {
  color: var(--gold);
}

.page-about .ab-rail__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(232, 241, 236, 0.62);
  border-left: 1px solid var(--line-strong);
  padding-left: 14px;
  max-width: 24ch;
}

.page-about .ab-figure {
  margin: 34px 0 0;
  position: relative;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .ab-figure--axis {
  max-width: 720px;
}

.page-about .ab-figure .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(232, 241, 236, 0.6);
}

/* section--light 内的文字与图注改走深色 */
.page-about .section--light .ab-text,
.page-about .section--light .ab-rail__note {
  color: rgba(11, 42, 34, 0.78);
}

.page-about .section--light .ab-figure .media__caption {
  color: rgba(11, 42, 34, 0.6);
}

/* ---------- 窄注释条 ---------- */
.page-about .ab-quiet {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-quiet__inner {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ab-quiet__line {
  margin: 0;
  font-size: clamp(20px, 3.4vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
  max-width: 26ch;
}

.page-about .ab-quiet__aside {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

@media (min-width: 900px) {
  .page-about .ab-quiet__inner {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 40px;
  }
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
  margin-top: 40px;
}

.page-about .timeline__rail {
  position: relative;
  padding-left: 46px;
}

.page-about .timeline__axis {
  position: absolute;
  left: 0;
  top: 6px;
  width: 24px;
  height: calc(100% - 12px);
  color: var(--grid);
  opacity: 0.55;
}

.page-about .timeline__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .timeline__nodes li {
  margin: 0;
}

.page-about .chapter-node {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cold);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .chapter-node:hover,
.page-about .chapter-node:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

.page-about .chapter-node.is-active {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--night);
}

.page-about .timeline__stages {
  display: grid;
  gap: 0;
}

.page-about .stage {
  padding: 24px 0 26px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
}

.page-about .stage:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .stage__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--violet);
  transition: color var(--dur) var(--ease);
}

.page-about .stage.is-active .stage__year {
  color: var(--gold);
}

.page-about .stage__title {
  margin: 0;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .stage__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.76);
}

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  }

  .page-about .timeline__rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding-left: 46px;
  }

  .page-about .timeline__nodes {
    flex-direction: column;
    gap: 26px;
  }
}

/* ---------- 全宽停顿 ---------- */
.page-about .ab-pause {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-pause__inner {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
}

.page-about .ab-pause__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(72px, 18vw, 176px);
  line-height: 0.9;
  color: var(--teal);
  letter-spacing: -0.04em;
}

.page-about .ab-pause__title {
  margin: 0 0 14px;
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.35;
  max-width: 22ch;
}

.page-about .ab-pause__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.78);
}

@media (min-width: 900px) {
  .page-about .ab-pause__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 48px;
  }
}

/* ---------- 流程 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: none;
}

.page-about .flow-step {
  position: relative;
  padding: 26px 0 28px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow-step__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--red);
}

.page-about .flow-step__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
}

.page-about .flow-step__text {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.76);
}

@media (min-width: 760px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }

  .page-about .flow-step:nth-child(2) {
    border-top-color: var(--line);
  }
}

@media (min-width: 1200px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 36px;
  }
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 30px;
}

.page-about .team-card {
  position: relative;
  padding: 24px 20px 26px;
  border: 1px solid var(--line-strong);
  background: rgba(11, 42, 34, 0.04);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--teal);
}

.page-about .team-card--red::before {
  background: var(--red);
}

.page-about .team-card--gold::before {
  background: var(--gold);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  background: rgba(11, 42, 34, 0.09);
  transform: translateY(-3px);
  outline: none;
}

.page-about .team-card__count {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(11, 42, 34, 0.6);
}

.page-about .team-card__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--night);
}

.page-about .team-card__detail {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(11, 42, 34, 0.78);
}

@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 栏目 ---------- */
.page-about .ab-columns {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 34px;
}

.page-about .col-item {
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  padding: 24px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .col-item--red {
  border-top-color: var(--red);
}

.page-about .col-item--gold {
  border-top-color: var(--gold);
}

.page-about .col-item--indigo {
  border-top-color: var(--indigo);
}

.page-about .col-item__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
}

.page-about .col-item__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.76);
}

.page-about .col-item__link {
  align-self: flex-start;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .col-item__link:hover,
.page-about .col-item__link:focus-visible {
  color: var(--cold);
  border-color: var(--cold);
}

@media (min-width: 760px) {
  .page-about .ab-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .ab-columns {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 坚持 ---------- */
.page-about .ab-pledges {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .pledge {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0 24px;
  border-top: 1px solid var(--line);
}

.page-about .pledge:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .pledge__index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .pledge__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
}

.page-about .pledge__text {
  margin: 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(232, 241, 236, 0.76);
}

/* ---------- CTA ---------- */
.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}

@media (max-width: 560px) {
  .page-about .ab-cta .btn {
    width: 100%;
    justify-content: center;
  }

  .page-about .ab-pause__num {
    font-size: clamp(60px, 22vw, 110px);
  }
}
<<<END>>>