.page-about {
  --about-gap: 24px;
  --about-ring: var(--c-amber-soft);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 10px;
}

.page-about .about-crumbs .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-graphite);
}

.page-about .about-crumbs .crumbs a {
  color: var(--c-deep-3);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumbs .crumbs a:hover,
.page-about .about-crumbs .crumbs a:focus-visible {
  border-bottom-color: var(--about-ring);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  padding: 40px 0 60px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -130px;
  width: 56%;
  height: 250px;
  background: var(--c-amber);
  opacity: .16;
  border-radius: 220px 0 0 220px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  min-width: 0;
}

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

.page-about .about-hero__ann {
  margin: 0 0 16px;
  color: var(--c-amber-soft);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 244, 238, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 22px;
}

.page-about .about-hero .btn--ghost {
  color: var(--c-paper);
  border-color: rgba(247, 244, 238, .45);
}

.page-about .about-hero .btn--ghost:hover,
.page-about .about-hero .btn--ghost:focus-visible {
  border-color: var(--about-ring);
  color: var(--c-amber-soft);
}

/* 概览牌 */
.page-about .about-hero__plate {
  min-width: 0;
  padding: 22px 20px;
  border-radius: var(--r-l);
  background: rgba(247, 244, 238, .07);
  border: 1px solid rgba(247, 244, 238, .18);
}

.page-about .about-hero__stamp {
  margin-bottom: 18px;
}

.page-about .about-figures {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-figures__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-top: 1px solid rgba(247, 244, 238, .14);
}

.page-about .about-figures__row:first-child {
  border-top: 0;
}

.page-about .about-figures dt {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(247, 244, 238, .66);
}

.page-about .about-figures dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 20px;
  color: var(--c-amber-soft);
}

/* ---------- 通用小节标题 ---------- */
.page-about .about-head {
  margin-bottom: 34px;
  min-width: 0;
}

.page-about .about-head .annotation {
  margin: 0 0 12px;
  color: var(--c-deep-3);
}

.page-about .about-head .section-title {
  margin: 0;
  color: var(--c-ink);
}

.page-about .about-head .section-lede {
  margin: 16px 0 0;
  max-width: 70ch;
  color: var(--c-graphite);
}

.page-about .about-head--split {
  display: grid;
  gap: 18px;
}

.page-about .about-head__note {
  margin: 0;
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-graphite);
}

.page-about .about-sub__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-textlink {
  display: inline-block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--c-deep-3);
  text-decoration: none;
  border-bottom: 2px solid var(--c-amber);
  padding-bottom: 2px;
}

.page-about .about-textlink:hover,
.page-about .about-textlink:focus-visible {
  color: var(--c-warn);
  border-bottom-color: var(--c-warn);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__grid {
  display: grid;
  gap: 36px;
  min-width: 0;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 2px solid var(--c-deep-3);
}

.page-about .about-timeline .timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline .timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c-fog);
  border: 3px solid var(--c-deep-3);
}

.page-about .about-timeline .timeline__item:last-child::before {
  background: var(--c-amber);
  border-color: var(--c-deep);
}

.page-about .about-timeline .timeline__date {
  margin: 0 0 4px;
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--c-warn);
}

.page-about .about-timeline .timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-timeline .timeline__body {
  margin: 0;
  max-width: 46ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-graphite);
}

.page-about .about-history__figure {
  margin: 0;
  border-radius: var(--r-l);
}

/* ---------- 分类体系 ---------- */
.page-about .about-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cat {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease),
    border-color 200ms var(--ease);
}

.page-about .about-cat--lg {
  background: var(--c-deep);
  color: var(--c-paper);
  font-size: 17px;
  padding: 0 24px;
}

.page-about .about-cat--md {
  background: var(--c-mist);
  color: var(--c-deep);
}

.page-about .about-cat--sm {
  background: transparent;
  border: 1px solid var(--c-mist);
  color: var(--c-graphite);
  font-weight: 500;
  font-size: 14px;
}

.page-about .about-cat:hover,
.page-about .about-cat:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--about-ring);
  outline: 2px solid var(--about-ring);
  outline-offset: 2px;
}

.page-about .about-cats__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 22px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 13px;
  color: var(--c-graphite);
}

.page-about .about-legend {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-legend::before {
  content: "";
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex: none;
}

.page-about .about-legend--lg::before {
  background: var(--c-deep);
}

.page-about .about-legend--md::before {
  background: var(--c-mist);
}

.page-about .about-legend--sm::before {
  background: transparent;
  border: 1px solid var(--c-mist);
}

.page-about .about-taxonomy__detail {
  display: grid;
  gap: 30px;
  margin-top: 42px;
  min-width: 0;
}

.page-about .about-taxonomy__text p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink);
}

.page-about .about-taxonomy__figure {
  margin: 0;
  border-radius: var(--r-l);
}

/* ---------- 校对标准 ---------- */
.page-about .about-proof__grid {
  display: grid;
  gap: 36px;
  min-width: 0;
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 20px 20px 20px 22px;
  border-radius: var(--r-m);
  background: var(--c-fog);
  border-left: 4px solid var(--c-deep-3);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-step:hover {
  border-left-color: var(--c-amber);
  transform: translateX(2px);
}

.page-about .about-step__no {
  font-size: 20px;
  line-height: 1.2;
  color: var(--c-deep-3);
}

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

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-step__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-graphite);
}

.page-about .about-proof__figure {
  margin: 0;
  border-radius: var(--r-l);
}

/* ---------- 团队 ---------- */
.page-about .about-team__list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  min-width: 0;
  padding: 24px 20px;
  border-radius: var(--r-m);
  background: var(--c-fog);
  border: 2px solid transparent;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease),
    box-shadow 200ms var(--ease);
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-visible {
  border-color: var(--about-ring);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  outline: none;
}

.page-about .about-team__num {
  margin: 0 0 4px;
  font-size: clamp(38px, 8vw, 54px);
  line-height: 1;
  color: var(--c-deep);
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .04em;
  color: var(--c-warn);
}

.page-about .about-team__desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-graphite);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-partner {
  min-width: 0;
  border-top: 4px solid var(--c-deep);
  border-radius: var(--r-m);
}

.page-about .about-partner__step {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-graphite);
}

.page-about .about-partner .card__title {
  margin: 0;
  font-size: 20px;
  color: var(--c-deep);
}

.page-about .about-partner .card__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-graphite);
}

.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin: 30px 0 0;
}

.page-about .about-partners__cta .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 22px;
}

/* ---------- 长期维护 ---------- */
.page-about .about-pledge__panel {
  display: grid;
  gap: 30px;
  padding: 34px 22px;
  border-radius: var(--r-l);
  background: var(--c-deep);
  color: var(--c-paper);
  position: relative;
  overflow: hidden;
}

.page-about .about-pledge__panel::after {
  content: "";
  position: absolute;
  left: -70px;
  top: -110px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: var(--c-amber);
  opacity: .12;
  pointer-events: none;
}

.page-about .about-pledge__intro {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about .about-pledge__intro .annotation {
  margin: 0 0 12px;
  color: var(--c-amber-soft);
}

.page-about .about-pledge__title {
  margin: 0 0 14px;
  color: var(--c-paper);
}

.page-about .about-pledge__intro p:last-child {
  margin: 0;
  max-width: 52ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 244, 238, .82);
}

.page-about .about-pledge__metrics {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 13px 0;
  border-top: 1px solid rgba(247, 244, 238, .16);
}

.page-about .about-metric:first-child {
  border-top: 0;
}

.page-about .about-metric__num {
  font-size: 24px;
  color: var(--c-amber-soft);
}

.page-about .about-metric__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(247, 244, 238, .7);
}

.page-about .about-metric__label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 14px;
  color: var(--c-paper);
}

/* ---------- 收束 ---------- */
.page-about .about-next__inner {
  padding: 30px 22px;
  border-radius: var(--r-l);
  background: var(--c-mist);
  display: grid;
  gap: 20px;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 52ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.55;
  color: var(--c-deep);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__links .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 22px;
}

/* ---------- 图片容器通用 ---------- */
.page-about .media {
  overflow: hidden;
}

.page-about .media__img,
.page-about .media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-l);
}

.page-about .media__caption {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-graphite);
}

/* ---------- 焦点统一 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--about-ring);
  outline-offset: 2px;
}

/* ---------- 滚动进入 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about {
    --about-gap: 28px;
  }

  .page-about .about-hero {
    padding: 56px 0 76px;
  }

  .page-about .about-hero__plate {
    padding: 26px 24px;
  }

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

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

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

  .page-about .about-next__inner {
    padding: 36px 32px;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 88px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, .6fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-head__note {
    padding-bottom: 6px;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-history__figure {
    position: sticky;
    top: calc(var(--top-h) + 24px);
  }

  .page-about .about-taxonomy__detail {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-proof__figure {
    position: sticky;
    top: calc(var(--top-h) + 24px);
  }

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

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

  .page-about .about-pledge__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
    padding: 48px 44px;
    align-items: center;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__grid {
    gap: 72px;
  }

  .page-about .about-history__grid {
    gap: 72px;
  }
}
<<<END>>>