.page-about {
  --about-ink: var(--ink-900);
  --about-radius: var(--radius-lg);
  color: var(--text);
  padding-bottom: clamp(2rem, 5vw, 4.4rem);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 2.6vw, 1.6rem);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .1rem .55rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumb__list a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumb__list a:hover {
  color: var(--gold-soft);
}

.page-about .breadcrumb__list li:not(:first-child)::before {
  content: "/";
  margin-right: .55rem;
  color: var(--line);
}

.page-about .breadcrumb__list li[aria-current="page"] {
  color: var(--gold-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.6rem) 0 clamp(1.8rem, 4.5vw, 2.9rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(680px 300px at 10% -8%, rgba(53, 224, 208, .12), transparent 70%),
    radial-gradient(600px 280px at 94% 6%, rgba(216, 169, 74, .12), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.3rem, 3.4vw, 2.2rem);
  align-items: start;
}

.page-about .about-hero__copy .kicker {
  margin: 0 0 .7rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 7.4vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: .04em;
  font-weight: 800;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--gold-soft);
  border-bottom: 4px solid rgba(53, 224, 208, .5);
  padding-bottom: .05em;
}

.page-about .about-hero .lede {
  margin: clamp(.9rem, 2.2vw, 1.3rem) 0 0;
  max-width: 46rem;
  font-size: clamp(.98rem, 1.9vw, 1.08rem);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: clamp(1.1rem, 2.6vw, 1.6rem);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .95rem 1rem;
  margin: clamp(1.3rem, 3vw, 1.9rem) 0 0;
  padding: clamp(1rem, 2.4vw, 1.3rem) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.6vw, 1.65rem);
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

.page-about .about-stat__num small {
  font-size: .58em;
  margin-left: .1em;
  color: var(--muted);
}

.page-about .about-stat__label {
  display: block;
  margin-top: .3rem;
  font-size: .76rem;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-hero__fig {
  width: 100%;
}

.page-about .about-hero__rotate {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--gold);
  padding-left: .7rem;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(1.8rem, 4.5vw, 3rem);
}

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

.page-about .about-section {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1.2rem, 3vw, 1.9rem);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: .5rem .85rem;
  margin-bottom: .9rem;
}

.page-about .about-section__no {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--gold);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  padding: .18rem .6rem;
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.4vw, 1.95rem);
  line-height: 1.3;
  letter-spacing: .03em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-section__lede {
  margin: 0 0 1.1rem;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-section .prose p {
  margin: 0 0 .95rem;
  font-size: clamp(.94rem, 1.8vw, 1rem);
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .about-quote {
  margin: 1.2rem 0 0;
  padding: .9rem 1.1rem;
  border-left: 3px solid var(--cyan);
  background: linear-gradient(90deg, rgba(53, 224, 208, .12), rgba(53, 224, 208, 0) 72%);
  font-size: clamp(.96rem, 2vw, 1.08rem);
  line-height: 1.65;
  color: var(--text);
  letter-spacing: .02em;
}

/* ---------- 版本时间线 ---------- */
.page-about .tl {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 1.1rem 1.5rem;
  border-left: 1px solid var(--line);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: .45rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(216, 169, 74, .16);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}

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

.page-about .tl__item--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 224, 208, .18);
}

.page-about .tl__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--gold-soft);
  background: rgba(216, 169, 74, .1);
  border: 1px solid rgba(216, 169, 74, .32);
  border-radius: var(--radius-md);
  padding: .12rem .45rem;
}

.page-about .tl__item--current .tl__ver {
  color: var(--cyan);
  border-color: rgba(53, 224, 208, .42);
  background: rgba(53, 224, 208, .1);
}

.page-about .tl__name {
  margin: .55rem 0 .3rem;
  font-size: 1.02rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
  transition: color .22s var(--ease);
}

.page-about .tl__item:hover .tl__name,
.page-about .tl__item:focus-within .tl__name {
  color: var(--gold-soft);
}

.page-about .tl__text {
  margin: 0;
  font-size: .87rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-tl-fig {
  margin-top: clamp(1.2rem, 3vw, 1.7rem);
}

/* ---------- 团队分工 ---------- */
.page-about .team-bars {
  display: grid;
  gap: .85rem;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: minmax(5rem, auto) minmax(0, 1fr) 2.1rem;
  align-items: center;
  gap: .65rem;
}

.page-about .team-bar__label {
  font-size: .84rem;
  color: var(--text);
  letter-spacing: .02em;
}

.page-about .team-bar__track {
  display: block;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  transition: width .6s var(--ease);
}

.page-about .team-bar:nth-child(1) .team-bar__fill { width: 38.9%; }
.page-about .team-bar:nth-child(2) .team-bar__fill { width: 33.3%; background: linear-gradient(90deg, var(--gold), var(--gold-soft)); }
.page-about .team-bar:nth-child(3) .team-bar__fill { width: 27.8%; background: linear-gradient(90deg, var(--coral), var(--gold-soft)); }

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: .96rem;
  text-align: right;
  color: var(--gold-soft);
}

.page-about .about-team-fig {
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
}

/* ---------- 内容流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .8rem;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  padding: 1rem 1.05rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background:
    linear-gradient(180deg, rgba(18, 58, 49, .78), rgba(7, 28, 24, .55));
}

.page-about .flow__no {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .flow__name {
  margin: .5rem 0 .35rem;
  font-size: 1rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
}

.page-about .flow__text {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据卡 ---------- */
.page-about .stat-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat-card {
  padding: .95rem 1rem 1.05rem;
  border-radius: var(--about-radius);
  border-left: 3px solid var(--cyan);
}

.page-about .stat-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.85rem);
  line-height: 1.15;
  letter-spacing: .01em;
  color: var(--ink-800);
}

.page-about .stat-card__num small {
  font-size: .55em;
  margin-left: .1em;
}

.page-about .stat-card__label {
  margin: .4rem 0 0;
  font-size: .78rem;
  line-height: 1.6;
  color: #3C534B;
}

/* ---------- 服务范围与联系 ---------- */
.page-about .about-scope {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
}

.page-about .about-scope__lead {
  margin: 0 0 1.2rem;
  font-size: clamp(.94rem, 1.9vw, 1rem);
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-contact {
  display: grid;
  gap: .1rem;
  margin: 0;
  padding: 0;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .15rem;
  padding: .7rem 0;
  border-top: 1px solid rgba(46, 90, 78, .7);
}

.page-about .about-contact dt {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-contact dd {
  margin: 0;
  font-size: .93rem;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-contact dd a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .4);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-contact dd a:hover {
  color: var(--gold-soft);
  border-color: var(--gold-soft);
}

.page-about .about-contact__note {
  margin: 1rem 0 0;
  font-size: .8rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-scope__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1.2rem;
}

/* ---------- 右侧章节索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-toc {
  padding: 1.1rem 1.15rem 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
}

.page-about .about-toc__title {
  margin: 0 0 .75rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-toc .toc {
  display: grid;
  gap: .1rem;
}

.page-about .about-toc .toc-link {
  display: block;
  padding: .42rem .55rem .42rem .7rem;
  border-left: 2px solid transparent;
  font-size: .84rem;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-toc .toc-link:hover {
  color: var(--text);
  background: rgba(53, 224, 208, .07);
}

.page-about .about-toc .toc-link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 224, 208, .09);
}

.page-about .about-toc__foot {
  margin-top: 1rem;
  padding-top: .9rem;
  border-top: 1px solid var(--line);
}

.page-about .about-toc__foot p {
  margin: .55rem 0 .6rem;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-toc__link {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(240, 201, 120, .4);
}

.page-about .about-toc__link:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-contact__row {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .tl__item {
    padding-bottom: 1.3rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.34fr) minmax(0, .84fr) auto;
    gap: clamp(1.6rem, 3vw, 2.4rem);
  }

  .page-about .about-hero__rotate {
    writing-mode: vertical-rl;
    border-left: 0;
    border-top: 2px solid var(--gold);
    padding: .8rem 0 0;
    justify-self: end;
    max-height: 21rem;
  }

  .page-about .tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: .9rem;
  }

  .page-about .tl__item {
    padding: 1.4rem 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .page-about .tl__item::before {
    left: 0;
    top: -5px;
  }

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

  .page-about .team-bar {
    grid-template-columns: 8.5rem minmax(0, 1fr) 2.4rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-offset) + .8rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>