.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(20px, 3vw, 36px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::before {
  width: min(96vw, 860px);
  aspect-ratio: 1 / 1;
  right: -26vw;
  top: -34vw;
  border: 1px solid var(--line-dark);
}

.page-about .about-hero::after {
  width: min(62vw, 500px);
  aspect-ratio: 1 / 1;
  right: -4vw;
  bottom: -22vw;
  border: 1px solid rgba(46, 196, 182, .24);
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(18px, 3vw, 32px);
}

.page-about .about-hero .c28-crumbs__link,
.page-about .about-hero .c28-crumbs__sep {
  color: var(--stone);
}

.page-about .about-hero .c28-crumbs__link:hover {
  color: var(--celadon);
}

.page-about .about-hero .c28-crumbs__current {
  color: var(--paper);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(20px, 3.5vw, 48px);
}

.page-about .about-hero__brand {
  display: grid;
  gap: 10px;
  align-content: start;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
}

.page-about .about-hero__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid var(--signal);
}

.page-about .about-hero__mark::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--celadon);
}

.page-about .about-hero__name {
  font-size: clamp(34px, 8vw, 60px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.045em;
  color: var(--paper);
}

.page-about .about-hero__since {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--celadon);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(30px, 5.2vw, 56px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.03em;
}

.page-about .about-hero__accent {
  color: var(--signal);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: rgba(244, 239, 230, .78);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-soft);
}

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

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 左侧章节轨道 + 正文 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 60px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-layout__rail-inner {
  display: block;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
}

.page-about .about-rail__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  transition: border-color .22s var(--ease), color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--signal);
  color: var(--ink);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(170px, 210px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-layout__rail-inner {
    position: sticky;
    top: 96px;
    padding-right: 14px;
    border-right: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 0 9px 14px;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(255, 106, 43, .07);
  }

  .page-about .about-rail__link[aria-current="true"] {
    border-left-color: var(--signal);
    color: var(--ink);
    font-weight: 700;
  }
}

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

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  scroll-margin-top: 96px;
}

.page-about .about-block + .about-block {
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: clamp(30px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-block__index {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--stone);
}

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

.page-about .about-block__title {
  margin: 12px 0 0;
  font-size: clamp(23px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -.02em;
  max-width: 26ch;
}

.page-about .about-block__prose p {
  margin: 14px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-block .c28-note {
  margin-top: clamp(18px, 3vw, 26px);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 32px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--signal);
  background: var(--white);
  transition: background-color .25s var(--ease);
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--signal);
  box-shadow: 0 14px 30px rgba(11, 27, 43, .09);
}

.page-about .about-timeline__item:hover::before {
  background: var(--signal);
}

.page-about .about-timeline__stage {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-timeline__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--slate);
}

@media (min-width: 820px) {
  .page-about .about-timeline {
    grid-auto-flow: column;
    grid-auto-columns: minmax(228px, 1fr);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    padding-bottom: 14px;
  }
}

/* ---------- 服务版图 ---------- */
.page-about .about-map {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-map__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

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

.page-about .about-map__nodes {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-map__node {
  position: relative;
  padding: 13px 15px 13px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .62);
  transition: transform .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-map__node::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 19px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--celadon);
}

.page-about .about-map__node:hover {
  transform: translateX(3px);
  border-color: var(--celadon);
  background: var(--white);
}

.page-about .about-map__node h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-map__node p {
  margin: 4px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--stone);
}

@media (min-width: 880px) {
  .page-about .about-map {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__stats {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-team__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-team__label {
  font-size: 13.5px;
  color: var(--stone);
}

.page-about .about-team__body .about-block__prose p:first-child {
  margin-top: 0;
}

@media (min-width: 880px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    align-items: start;
  }
}

/* ---------- 会员 ---------- */
.page-about .about-member {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-member__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink);
}

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

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

.page-about .about-member__level {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 10px 14px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color .22s var(--ease);
}

.page-about .about-member__level:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-member__level:hover {
  background: rgba(46, 196, 182, .08);
}

.page-about .about-member__tier {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--celadon-deep);
}

.page-about .about-member__level h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .about-member__level p {
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--slate);
}

@media (min-width: 880px) {
  .page-about .about-member {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__stats {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-eco__stat {
  padding: 18px;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-eco__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--stone);
}

.page-about .about-eco__directions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: grid;
  gap: 14px;
  margin-top: clamp(30px, 4.5vw, 52px);
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-cta__ring {
  position: absolute;
  right: -14%;
  top: -46%;
  width: min(58vw, 380px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(46, 196, 182, .28);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(21px, 2.7vw, 30px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -.02em;
  max-width: 22ch;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 239, 230, .78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}
<<<END>>>