.page-about {
  --about-blob: 44% 56% 48% 52% / 54% 46% 54% 46%;
  --about-card-radius: 20px 8px 22px 10px;
}

/* ---------- 通用小件 ---------- */
.page-about .about-head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-head__note {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 46em;
}

.page-about .about-copy p {
  margin: 0 0 1.1em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(4px, 1.5vw, 16px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  max-width: 15ch;
  letter-spacing: -0.01em;
}

.page-about .about-hero__lede {
  max-width: 32em;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 0;
}

.page-about .about-facts__item {
  border-top: 1px solid var(--silver);
  padding-top: 10px;
  min-width: 0;
}

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--dai);
}

.page-about .about-facts dd .mono {
  font-size: 21px;
  letter-spacing: 0.01em;
}

.page-about .about-hero__media {
  margin: clamp(34px, 5vw, 64px) 0 0;
}

/* ---------- 为什么做 ---------- */
.page-about .about-why__split {
  display: grid;
  gap: clamp(22px, 3.5vw, 46px);
}

/* ---------- 档案库色块 ---------- */
.page-about .about-slip {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .about-slip::before {
  content: "";
  display: none;
}

.page-about .about-slip__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

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

.page-about .about-slip__lede {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 3vw, 27px);
  line-height: 1.5;
  margin: 10px 0 12px;
  color: var(--ink);
}

.page-about .about-slip__para {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 30em;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(22px, 3.5vw, 36px);
}

.page-about .about-timeline__rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-timeline__rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--silver);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--dai);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--paper-3);
}

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

.page-about .about-phase {
  padding: clamp(22px, 3.5vw, 34px) 0;
  scroll-margin-top: 108px;
}

.page-about .about-phase:first-child {
  padding-top: 0;
}

.page-about .about-phase + .about-phase {
  border-top: 1px solid var(--silver);
}

.page-about .about-phase__meta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-phase__meta::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-phase__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.45;
  margin: 10px 0 12px;
  color: var(--ink);
}

.page-about .about-phase__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

/* ---------- 团队 ---------- */
.page-about .about-team__top {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-bottom: clamp(30px, 4.5vw, 52px);
}

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

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.page-about .about-team__card {
  position: relative;
  background: var(--paper-3);
  border: 1px solid var(--silver);
  border-radius: var(--about-card-radius);
  padding: 20px 18px 22px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-team__card:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .about-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 10px 0 8px;
  color: var(--ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 专题 ---------- */
.page-about .about-album__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-album {
  color: var(--gold);
}

.page-about .about-album__line {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  fill: var(--gold);
}

.page-about .about-album__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-topics {
  display: grid;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-topic {
  background: var(--paper-3);
  border: 1px solid var(--silver);
  border-radius: 6px 20px 6px 20px;
  padding: 18px 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-topic:hover,
.page-about .about-topic:focus-within {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .about-topic__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-topic__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-topic__no {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .about-topic__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-topic__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.32s ease;
}

.page-about .about-topic__list {
  margin: 12px 0 0;
  padding: 12px 0 0 18px;
  border-top: 1px solid var(--silver);
  list-style: square;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-topic__list li::marker {
  color: var(--gold);
}

/* ---------- 线索与投稿 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 14px;
  padding: 20px 0;
  border-top: 1px solid var(--silver);
}

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

.page-about .about-steps__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
  padding-top: 4px;
}

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

.page-about .about-steps__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .about-contribute__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 36px);
}

/* ---------- 合作方式 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
}

.page-about .about-partners__item {
  display: block;
  position: relative;
  padding: 22px 20px 20px;
  background: var(--paper-3);
  border: 1px solid var(--silver);
  border-radius: 4px 22px 4px 22px;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-partners__item:hover,
.page-about .about-partners__item:focus-visible {
  transform: translateY(-2px);
  border-color: var(--gold);
}

.page-about .about-partners__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-partners__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-partners__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-partners__go {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dai);
  border-bottom: 1px solid var(--gold);
  padding-bottom: 2px;
}

/* ---------- 收尾 ---------- */
.page-about .about-next__inner {
  border-top: 1px solid var(--silver);
  padding-top: clamp(28px, 4vw, 44px);
}

.page-about .about-next__title {
  margin: 12px 0 14px;
}

.page-about .about-next__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 40em;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 焦点可达 ---------- */
.page-about a:focus-visible,
.page-about .about-topic:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-topics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-slip::before {
    display: block;
    position: absolute;
    z-index: 0;
    top: 4%;
    bottom: 22%;
    left: 5%;
    right: 46%;
    background: var(--dai);
    border-radius: var(--about-blob);
    transform: rotate(-1.6deg);
  }

  .page-about .about-slip__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-slip__figure {
    transform: translateY(-14px);
  }

  .page-about .about-slip__text {
    transform: translateY(26px);
  }

  .page-about .about-album__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    column-gap: clamp(36px, 5vw, 72px);
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    column-gap: clamp(40px, 6vw, 88px);
    align-items: end;
  }

  .page-about .about-hero__stats {
    padding-bottom: clamp(6px, 1.5vw, 20px);
  }

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

  .page-about .about-why__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: clamp(36px, 6vw, 80px);
  }

  .page-about .about-why__split > .about-copy:last-child {
    padding-top: clamp(24px, 3.5vw, 48px);
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 128px minmax(0, 1fr);
    column-gap: clamp(36px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-timeline__rail-list {
    flex-direction: column;
    gap: 22px;
    overflow: visible;
    padding: 0 0 0 22px;
    border-left: 1px solid var(--silver);
  }

  .page-about .about-rail__link {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    position: relative;
    font-size: 12.5px;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -26px;
    top: 0.42em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--silver);
    transition: background-color 0.2s ease, transform 0.2s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    color: var(--gold);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--gold);
    transform: scale(1.35);
  }

  .page-about .about-team__top {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    column-gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-team__intro {
    padding-top: clamp(16px, 3vw, 40px);
  }

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

@media (min-width: 1024px) {
  .page-about .about-partners {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-topic__body {
    max-height: none;
  }
}
<<<END>>>