.page-about {
  --about-rail-top: calc(var(--header-h-compact) + 6px);
  --about-node-line: rgba(14, 122, 79, .35);
  --about-soft-line: rgba(227, 233, 230, .55);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(16px, 3vw, 28px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(120% 95% at 88% 0%, rgba(25, 227, 209, .18), transparent 58%),
    radial-gradient(85% 70% at 0% 100%, rgba(14, 122, 79, .38), transparent 62%);
}

.page-about .about-hero__frame {
  margin-top: clamp(20px, 3vw, 34px);
  padding: clamp(24px, 4vw, 48px) clamp(18px, 3.4vw, 44px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 6.6vw, 72px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: .012em;
  color: var(--c-white);
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 58ch;
  color: var(--on-dark-strong);
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-hero__stat {
  background: rgba(20, 42, 63, .72);
  padding: 18px 16px;
}

.page-about .about-hero__stat-v {
  display: block;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: .02em;
}

.page-about .about-hero__stat-l {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--on-dark);
}

/* ---------- 章节索引轨 ---------- */

.page-about .about-rail {
  position: sticky;
  top: var(--about-rail-top);
  z-index: 40;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  padding: 8px var(--gutter);
  background: rgba(11, 27, 43, .9);
  border-bottom: 1px solid var(--line-dark);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  scrollbar-width: none;
}

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

.page-about .about-rail .chapter-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  font-size: 13px;
  color: var(--on-dark);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail .chapter-index__link .mono {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-graphite);
}

.page-about .about-rail .chapter-index__link:hover,
.page-about .about-rail .chapter-index__link:focus-visible {
  color: var(--c-white);
  border-color: rgba(25, 227, 209, .45);
}

.page-about .about-rail .chapter-index__link.is-active {
  color: var(--c-ink);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .about-rail .chapter-index__link.is-active .mono {
  color: rgba(11, 27, 43, .62);
}

/* ---------- 通用文字 ---------- */

.page-about .about-lead {
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.8;
  font-weight: 500;
  color: var(--c-ink);
  margin: 0 0 20px;
}

.page-about .about-link {
  color: var(--c-grass);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 122, 79, .38);
  padding-bottom: 1px;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--c-grass-deep);
  border-bottom-color: var(--c-grass-deep);
}

.page-about .about-link--light {
  color: var(--c-cyan);
  border-bottom-color: rgba(25, 227, 209, .45);
}

.page-about .about-link--light:hover,
.page-about .about-link--light:focus-visible {
  color: var(--c-white);
  border-bottom-color: var(--c-white);
}

.page-about .band--ink h2,
.page-about .band--ink h3,
.page-about .band--grass h2,
.page-about .band--grass h3,
.page-about .band--grass-deep h2,
.page-about .band--grass-deep h3 {
  color: var(--c-white);
}

.page-about .band--ink p,
.page-about .band--grass p,
.page-about .band--grass-deep p {
  color: var(--on-dark);
}

/* ---------- 全景横幅 ---------- */

.page-about .about-panorama {
  padding: clamp(28px, 5vw, 64px) 0;
}

.page-about .about-panorama__media {
  margin: 0;
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
}

.page-about .about-panorama__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .about-panorama__media .media__caption {
  padding: 14px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-dark);
  background: rgba(20, 42, 63, .7);
}

/* ---------- 能力边界 ---------- */

.page-about .about-capability__grid {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-capability__copy p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

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

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

.page-about .about-focus__foot {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-graphite);
}

/* ---------- 团队 ---------- */

.page-about .about-team__lede {
  max-width: 56ch;
  color: var(--on-dark-strong);
}

.page-about .about-team__grid {
  margin-top: clamp(28px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__bars {
  display: grid;
  gap: 24px;
}

.page-about .about-bar__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-bar__num {
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: .02em;
}

.page-about .about-bar__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-bar__track {
  margin-top: 11px;
  height: 6px;
  border-radius: 3px;
  background: rgba(247, 250, 248, .18);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
  transition: filter .18s var(--ease), transform .18s var(--ease);
  transform-origin: left center;
}

.page-about .about-bar:hover .about-bar__fill,
.page-about .about-bar:focus-within .about-bar__fill {
  filter: brightness(1.18);
  transform: scaleY(1.5);
}

.page-about .about-bar__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 250, 248, .74);
  max-width: 52ch;
  transition: color .18s var(--ease);
}

.page-about .about-bar:hover .about-bar__note {
  color: var(--c-white);
}

.page-about .about-team__figure {
  margin: 28px 0 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid rgba(247, 250, 248, .22);
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(247, 250, 248, .72);
}

/* ---------- 内容流程 ---------- */

.page-about .about-process__lede {
  max-width: 52ch;
  color: var(--c-graphite);
}

.page-about .about-steps {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  padding: 24px 0 24px 14px;
  border-top: 1px solid var(--about-soft-line);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-cyan);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform .24s var(--ease);
}

.page-about .about-step:hover::before,
.page-about .about-step:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-step__num {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-orange);
  padding-top: 5px;
}

.page-about .about-step__body h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-step__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink-2);
  max-width: 60ch;
}

/* ---------- 历程 ---------- */

.page-about .about-timeline__lede {
  max-width: 44ch;
  color: var(--on-dark);
}

.page-about .about-timeline__grid {
  margin-top: clamp(28px, 4vw, 44px);
  align-items: start;
}

.page-about .about-chrono {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-chrono::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-grass) 0%, var(--c-cyan) 55%, var(--c-orange) 100%);
  opacity: .6;
}

.page-about .about-chrono__item {
  position: relative;
  padding: 0 0 32px;
}

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

.page-about .about-chrono__node {
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-grass);
  border: 2px solid var(--c-ink);
  box-shadow: 0 0 0 3px rgba(25, 227, 209, .2);
}

.page-about .about-chrono__item:last-child .about-chrono__node {
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 26, .22);
}

.page-about .about-chrono__year {
  margin: 0 0 6px;
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--c-cyan);
}

.page-about .about-chrono__body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 900;
}

.page-about .about-chrono__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark);
  max-width: 56ch;
}

.page-about .about-timeline__figure {
  margin: 34px 0 0;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid var(--line-dark);
}

.page-about .about-timeline__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-graphite);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners__lede {
  max-width: 58ch;
  color: var(--c-graphite);
}

.page-about .about-partners__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: 20px;
}

.page-about .about-node {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: var(--c-white);
  border: 1px solid var(--about-soft-line);
  border-left: 3px solid var(--c-grass);
  transition: transform .18s var(--ease), border-left-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  transform: translateY(-2px);
  border-left-color: var(--c-cyan);
  box-shadow: 0 12px 28px -18px rgba(11, 27, 43, .5);
}

.page-about .about-node__coord {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-orange);
}

.page-about .about-node__title {
  margin: 8px 0 10px;
  font-size: clamp(19px, 2.3vw, 24px);
  font-weight: 900;
  color: var(--c-ink);
}

.page-about .about-node__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .about-node__foot {
  margin: 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-graphite);
  padding-top: 12px;
  border-top: 1px dashed var(--about-soft-line);
}

/* ---------- 荣誉与标准 ---------- */

.page-about .about-honor__head .section__index {
  color: rgba(247, 250, 248, .6);
}

.page-about .about-honor__body {
  margin-top: 24px;
}

.page-about .about-honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-honor__item {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(247, 250, 248, .16);
}

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

.page-about .about-honor__mark {
  margin-top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(25, 227, 209, .22);
}

.page-about .about-honor__item p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-white);
}

.page-about .about-honor__foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--on-dark);
}

/* ---------- 尾段行动 ---------- */

.page-about .about-cta__inner {
  padding: clamp(28px, 4.4vw, 52px) clamp(20px, 3.6vw, 48px);
  background: linear-gradient(115deg, rgba(227, 233, 230, .8), rgba(247, 250, 248, .95) 58%);
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  color: var(--c-ink);
}

.page-about .about-cta__lede {
  margin-top: 16px;
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--c-ink-2);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-cta__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 24px 0 0;
  padding: 0;
  font-size: 14px;
}

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

/* ---------- 响应式 ---------- */

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

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

  .page-about .about-node:nth-child(2) {
    margin-top: 34px;
  }
}

@media (min-width: 900px) {
  .page-about .about-capability__aside {
    padding-left: 12px;
  }

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

  .page-about .about-timeline__figure {
    margin-top: 0;
  }

  .page-about .about-honor__body {
    margin-top: 0;
  }

  .page-about .about-step {
    grid-template-columns: 64px 1fr;
    padding: 28px 0 28px 20px;
  }

  .page-about .about-chrono__item {
    display: grid;
    grid-template-columns: 92px 1fr;
    gap: 20px;
  }

  .page-about .about-chrono__year {
    text-align: right;
    padding-top: 2px;
    margin-bottom: 0;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .about-node:nth-child(1) {
    grid-column: 1 / span 5;
    margin-top: 0;
  }

  .page-about .about-node:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 42px;
  }

  .page-about .about-node:nth-child(3) {
    grid-column: 3 / span 7;
    margin-top: 0;
  }
}

@media (min-width: 1480px) {
  .page-about .about-rail {
    position: fixed;
    top: 50%;
    left: calc(50% - 600px - 92px);
    transform: translateY(-50%);
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
    padding: 12px 10px;
    width: 78px;
    overflow: visible;
    border: 1px solid var(--line-dark);
    border-radius: 14px;
    border-bottom-color: var(--line-dark);
  }

  .page-about .about-rail .chapter-index__link {
    width: 100%;
    justify-content: flex-start;
    padding: 8px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bar__fill,
  .page-about .about-step::before,
  .page-about .about-node,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-bar:hover .about-bar__fill {
    transform: none;
  }

  .page-about .about-node:hover {
    transform: none;
  }
}
<<<END>>>