.page-about {
  --ab-year-w: 52px;
  --ab-narrow: 58ch;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  background:
    radial-gradient(115% 78% at 10% -8%, rgba(58, 30, 92, 0.82), rgba(58, 30, 92, 0) 62%),
    radial-gradient(80% 60% at 96% 4%, rgba(53, 224, 214, 0.07), rgba(53, 224, 214, 0) 58%),
    var(--sm-ink);
  border-bottom: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-hero__kicker {
  margin: 22px 0 14px;
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--sm-font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--sm-bright);
  max-width: 20ch;
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--sm-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .ab-hero__status {
  margin: 24px 0 0;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 34px 0 0;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-stat {
  padding: 16px 14px 16px 0;
  border-bottom: var(--sm-line-w) solid var(--sm-line);
  min-width: 0;
}

.page-about .ab-stat__key {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sm-blue);
}

.page-about .ab-stat__num {
  margin: 0;
  font-family: var(--sm-font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.1;
  color: var(--sm-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat__num sup {
  font-size: 0.5em;
  vertical-align: super;
  color: var(--sm-gold-lift);
}

/* ---------- 时间线 ---------- */
.page-about .ab-epoch__lede {
  max-width: 60ch;
}

.page-about .ab-tlbanner {
  margin: 4px 0 0;
  border: var(--sm-line-w) solid var(--sm-line);
  overflow: hidden;
}

.page-about .ab-tlbanner__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .ab-timeline {
  position: relative;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-year-w) minmax(0, 1fr);
  gap: 16px;
  padding: 26px 0 26px 16px;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 52px;
  bottom: 0;
  width: var(--sm-line-w);
  background: var(--sm-line);
}

.page-about .ab-node:last-child::before {
  bottom: 26px;
}

.page-about .ab-node__year {
  position: relative;
  align-self: start;
  justify-self: start;
}

.page-about .ab-node__year::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--sm-gold);
  transform: rotate(45deg);
}

.page-about .ab-node__body {
  min-width: 0;
  max-width: var(--ab-narrow);
}

.page-about .ab-node__title {
  margin: 0;
  font-family: var(--sm-font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--sm-bright);
}

.page-about .ab-node__lead {
  margin: 8px 0 0;
  color: var(--sm-body);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ab-node .sm-fold {
  margin-top: 12px;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

/* ---------- 版本号规则 ---------- */
.page-about .ab-ver__lede {
  max-width: 62ch;
}

.page-about .ab-verseq {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sm-line-w);
  margin-top: 26px;
  background: var(--sm-line);
  border: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-verseq__part {
  margin: 0;
  padding: 22px 18px 24px;
  background: var(--sm-purple-deep);
  min-width: 0;
}

.page-about .ab-verseq__pos {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sm-blue);
}

.page-about .ab-verseq__num {
  margin: 8px 0 0;
  font-family: var(--sm-font-mono);
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--sm-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-verseq__name {
  margin: 10px 0 0;
  font-family: var(--sm-font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--sm-bright);
}

.page-about .ab-verseq__desc {
  margin: 8px 0 0;
  color: var(--sm-body);
  font-size: 14px;
  line-height: 1.85;
}

.page-about .ab-ver__note {
  margin-top: 20px;
  max-width: 72ch;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__lede {
  max-width: 62ch;
}

.page-about .ab-teamgrid {
  margin-top: 26px;
  align-items: start;
}

.page-about .ab-teamgrid__figure {
  margin-bottom: 22px;
}

.page-about .ab-teampic {
  margin: 0;
  border: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-team {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-team__item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  padding: 18px 0;
  border-bottom: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-team__num {
  grid-row: span 2;
  margin: 0;
  font-family: var(--sm-font-mono);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--sm-gold);
  font-variant-numeric: tabular-nums;
  align-self: start;
}

.page-about .ab-team__role {
  margin: 0;
  font-family: var(--sm-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--sm-bright);
}

.page-about .ab-team__desc {
  margin: 0;
  color: var(--sm-body);
  font-size: 14px;
  line-height: 1.8;
  min-width: 0;
}

/* ---------- 白名单 ---------- */
.page-about .ab-white__lede {
  max-width: 62ch;
}

.page-about .ab-whitegrid {
  margin-top: 24px;
  align-items: start;
}

.page-about .ab-white__cap {
  padding: 0 0 10px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--sm-blue);
}

.page-about .ab-white__foot {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--sm-body);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .ab-whitepic {
  margin: 24px 0 0;
  border: var(--sm-line-w) solid var(--sm-line);
}

/* ---------- 生态与覆盖 ---------- */
.page-about .ab-eco__lede {
  max-width: 62ch;
}

.page-about .ab-ecolist {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-ecolist__item {
  padding: 22px 0;
  border-bottom: var(--sm-line-w) solid var(--sm-line);
  min-width: 0;
}

.page-about .ab-ecolist__num {
  margin: 0;
  font-family: var(--sm-font-mono);
  font-size: clamp(34px, 5.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--sm-status);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-ecolist__key {
  margin: 10px 0 0;
  font-family: var(--sm-font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--sm-bright);
}

.page-about .ab-ecolist__desc {
  margin: 8px 0 0;
  color: var(--sm-body);
  font-size: 14px;
  line-height: 1.8;
  max-width: 46ch;
}

.page-about .ab-eco__tail {
  margin: 26px 0 0;
  max-width: 62ch;
  color: var(--sm-body);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 后续入口 ---------- */
.page-about .ab-next__list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--sm-line-w) solid var(--sm-line);
}

.page-about .ab-next__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: var(--sm-line-w) solid var(--sm-line);
  min-width: 0;
}

.page-about .ab-next__link {
  font-family: var(--sm-font-display);
  font-weight: 700;
  font-size: 16px;
  overflow-wrap: anywhere;
}

.page-about .ab-next__desc {
  color: var(--sm-body);
  font-size: 14px;
  line-height: 1.8;
  max-width: 60ch;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stat {
    padding-right: 18px;
  }

  .page-about .ab-verseq {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-ecolist {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--sm-line);
  }

  .page-about .ab-ecolist__item {
    border-bottom: 0;
    background: var(--sm-ink);
    padding: 24px 20px 26px 0;
  }

  .page-about .ab-ecolist__item + .ab-ecolist__item {
    padding-left: 20px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-year-w: 88px;
    --ab-narrow: 60ch;
  }

  .page-about .ab-hero {
    padding: 40px 0 64px;
  }

  .page-about .ab-hero__kicker {
    margin-top: 30px;
  }

  .page-about .ab-node {
    gap: 26px;
    padding: 34px 0 34px 22px;
  }

  .page-about .ab-node::before {
    left: 4px;
    top: 62px;
  }

  .page-about .ab-node:last-child::before {
    bottom: 34px;
  }

  .page-about .ab-node__year::before {
    left: -22px;
    top: 8px;
    width: 9px;
    height: 9px;
  }

  .page-about .ab-node__title {
    font-size: 22px;
  }

  .page-about .ab-node__lead {
    font-size: 16px;
  }

  .page-about .ab-verseq__part {
    padding: 28px 24px 30px;
  }

  .page-about .ab-teamgrid__figure {
    margin-bottom: 0;
  }

  .page-about .ab-whitepic {
    margin-top: 0;
  }

  .page-about .ab-next__item {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
    padding: 20px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__year::before,
  .page-about .ab-tlbanner__img {
    transition: none;
    animation: none;
  }
}
<<<END>>>