.page-about {
  --about-rail-width: 250px;
  --about-gap: 60px;
  --about-hair: rgba(34, 28, 26, .14);
  --about-hair-strong: rgba(34, 28, 26, .26);
  display: block;
  background: var(--cream);
  color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: 22px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 34px 0 68px;
  background:
    radial-gradient(140% 110% at 90% -20%, rgba(159, 184, 196, .32) 0%, rgba(159, 184, 196, 0) 64%),
    var(--cream);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  padding-top: 24px;
  align-items: start;
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero__lead .title-xl {
  margin: 0 0 20px;
  color: var(--purple-deep);
  letter-spacing: -0.01em;
}

.page-about .about-hero__lead .lede {
  margin: 0 0 30px;
  max-width: 640px;
  color: var(--ink-soft);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__stats li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__stats .stat-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--purple-deep);
  line-height: 1;
}

.page-about .about-hero__stat-label {
  font-size: 14px;
  color: var(--mist-deep);
}

.page-about .about-hero__quote {
  border-left: 2px solid var(--gold);
  padding: 4px 0 4px 22px;
}

.page-about .about-hero__quote-text {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 19px;
  line-height: 1.7;
  color: var(--purple-deep);
}

.page-about .about-hero__quote-src {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist-deep);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 68px;
    align-items: center;
    padding-top: 40px;
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: 56px;
  padding-bottom: 0;
}

.page-about .about-body > * {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: var(--about-gap);
    padding-top: 88px;
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist-deep);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--about-hair-strong);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-rail__list .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold);
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__list li {
    flex: 0 0 auto;
    width: 100%;
  }

  .page-about .about-rail__list a {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
    padding: 12px 2px;
    border: 0;
    border-top: 1px solid var(--about-hair);
    border-radius: 0;
    background: none;
    font-size: 14.5px;
    color: var(--ink-soft);
    white-space: normal;
    line-height: 1.55;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    color: var(--purple-deep);
    border-top-color: var(--gold);
  }
}

/* ---------- 右侧内容 ---------- */
.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: 84px;
}

@media (min-width: 900px) {
  .page-about .about-content {
    gap: 120px;
  }
}

.page-about .about-ch {
  scroll-margin-top: 96px;
}

.page-about .about-ch .eyebrow {
  margin-bottom: 10px;
}

.page-about .about-ch .title-lg {
  margin: 0 0 24px;
  color: var(--purple-deep);
}

.page-about .about-ch__intro {
  margin: 0 0 34px;
  color: var(--ink-soft);
}

.page-about .about-ch__body p {
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-ch__body > p:first-of-type::first-letter {
  float: left;
  font-family: var(--font-head);
  font-size: 2.7em;
  line-height: .96;
  font-weight: 600;
  color: var(--purple-deep);
  padding: 6px 12px 0 0;
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
}

.page-about .about-ch__figure {
  margin: 0 0 26px;
}

.page-about .about-ch__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-ch__cap {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-deep);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  position: relative;
  margin-top: 8px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 1px;
  background: linear-gradient(180deg,
      var(--gold) 0%,
      rgba(200, 162, 39, .30) 68%,
      rgba(200, 162, 39, 0) 100%);
}

.page-about .about-tl__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 44px;
  list-style: none;
}

.page-about .about-tl__item {
  position: static;
}

.page-about .about-tl__dot {
  position: absolute;
  left: 9px;
  margin-top: 18px;
  width: 12px;
  height: 12px;
  display: block;
  line-height: 0;
}

.page-about .about-tl__dot svg {
  display: block;
  width: 12px;
  height: 12px;
}

.page-about .about-tl__fold {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-tl__sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  transition: color .18s var(--ease);
}

.page-about .about-tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-tl__sum:hover .about-tl__name,
.page-about .about-tl__sum:focus-visible .about-tl__name {
  color: var(--purple-mid);
}

.page-about .about-tl__year {
  flex: 0 0 auto;
  min-width: 58px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--purple-deep);
}

.page-about .about-tl__name {
  flex: 1 1 auto;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  transition: color .18s var(--ease);
}

.page-about .about-tl__caret {
  flex: 0 0 auto;
  align-self: center;
  width: 8px;
  height: 8px;
  margin-top: 3px;
  border-right: 1.5px solid var(--mist-deep);
  border-bottom: 1.5px solid var(--mist-deep);
  transform: rotate(45deg);
  transition: transform .18s var(--ease);
}

.page-about .about-tl__fold[open] .about-tl__caret {
  transform: rotate(-135deg);
  margin-top: -3px;
}

.page-about .about-tl__body {
  padding: 0 0 20px;
}

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

/* ---------- 深色权益面板 ---------- */
.page-about .about-ch--dark {
  background: var(--purple-deep);
  color: var(--cream);
  border-radius: 3px;
  padding: 34px 22px 36px;
  box-shadow: 8px 8px 0 rgba(24, 13, 38, .10);
}

.page-about .about-ch--dark .eyebrow {
  color: var(--gold-soft);
  margin-bottom: 10px;
}

.page-about .about-ch--dark .title-lg {
  color: var(--cream);
  margin: 0 0 16px;
}

.page-about .about-ch__dark-lede {
  margin: 0 0 6px;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(246, 241, 231, .80);
}

.page-about .about-tiers {
  display: grid;
  gap: 22px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tier {
  border-top: 1px solid rgba(235, 217, 164, .30);
  padding-top: 16px;
}

.page-about .about-tier__name {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 3px;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--gold-soft);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-tier p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(246, 241, 231, .82);
}

.page-about .about-ch__dark-note {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(235, 217, 164, .18);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 241, 231, .72);
}

@media (min-width: 760px) {
  .page-about .about-ch--dark {
    padding: 48px 44px 50px;
  }

  .page-about .about-tiers {
    grid-template-columns: 1fr 1fr;
    gap: 28px 36px;
  }
}

/* ---------- 引导条 ---------- */
.page-about .about-callout {
  margin-top: 32px;
  padding: 22px 20px;
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--gold);
  background: var(--paper);
  border-radius: 2px;
}

.page-about .about-callout__lead {
  margin: 0 0 12px;
  font-size: 14.5px;
  color: var(--mist-deep);
}

.page-about .about-callout__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-callout__links a {
  position: relative;
  display: inline-block;
  color: var(--purple-deep);
  font-size: 15.5px;
  font-weight: 500;
  text-decoration: none;
  padding-bottom: 3px;
}

.page-about .about-callout__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: width .18s var(--ease);
}

.page-about .about-callout__links a:hover::after,
.page-about .about-callout__links a:focus-visible::after {
  width: 100%;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 84px;
  padding: 52px 0 68px;
  border-top: 2px solid var(--gold);
  background: var(--paper);
}

.page-about .about-cta__title {
  margin: 0 0 28px;
  color: var(--purple-deep);
}

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

.page-about .about-cta__list li {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-cta__list a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
  align-items: baseline;
  padding: 18px 4px;
  color: var(--ink);
  text-decoration: none;
  transition: background .18s var(--ease);
}

.page-about .about-cta__list a:hover,
.page-about .about-cta__list a:focus-visible {
  background: rgba(200, 162, 39, .08);
}

.page-about .about-cta__num {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-cta__name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  color: var(--purple-deep);
  line-height: 1.5;
}

.page-about .about-cta__desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist-deep);
}

.page-about .about-cta__back {
  margin: 26px 0 0;
  font-size: 14.5px;
}

.page-about .about-cta__back a {
  color: var(--purple-mid);
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

@media (min-width: 760px) {
  .page-about .about-cta {
    margin-top: 120px;
    padding: 64px 0 84px;
  }

  .page-about .about-cta__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 34px;
  }

  .page-about .about-cta__list a {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 20px 2px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__caret,
  .page-about .about-callout__links a::after,
  .page-about .about-rail__list a {
    transition: none;
  }
}
<<<END>>>