.page-about {
  --about-rail-w: 220px;
  --about-node-gap: 48px;
  --about-body: rgba(237, 241, 242, 0.78);
  --about-ink-soft: rgba(20, 49, 58, 0.78);
  --about-line-light: rgba(20, 49, 58, 0.16);
  background: var(--ink);
  color: var(--fog);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  background: var(--ink);
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(120% 96% at 10% 0%, rgba(42, 90, 99, 0.58), transparent 62%),
    radial-gradient(90% 72% at 92% 104%, rgba(228, 118, 42, 0.16), transparent 62%),
    var(--ink);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero__frame {
  position: relative;
  display: grid;
  gap: 20px;
  margin: 22px 0 48px;
  padding: 32px 20px 34px;
}

.page-about .about-hero__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-hero__route {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.85rem, 6vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(237, 241, 242, 0.86);
}

.page-about .about-hero__strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  margin: 8px 0 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-hero__strip li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-right: 22px;
  padding-right: 22px;
  border-right: 1px solid var(--rule-soft);
  font-size: 0.82rem;
  color: var(--cold);
}

.page-about .about-hero__strip li:last-child {
  margin-right: 0;
  padding-right: 0;
  border-right: 0;
}

.page-about .about-hero__strip .num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__anno {
  display: none;
}

/* ---------- 起点叙事 ---------- */
.page-about .about-origin {
  background: var(--fog);
  color: var(--ink);
  padding-block: 52px 56px;
}

.page-about .about-origin__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-origin__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-origin__pull {
  margin: 18px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--dai);
}

.page-about .about-origin__body p {
  margin: 0 0 1.15em;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--bridge);
}

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

.page-about .about-origin .eyebrow {
  color: var(--dai);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--ink);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding-block: 52px 60px;
}

.page-about .about-timeline__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-timeline__intro {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--cold);
}

.page-about .about-timeline__layout {
  display: grid;
  gap: 34px;
  margin-top: 34px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: 0.82rem;
  white-space: nowrap;
  color: var(--cold);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--amber);
  border-color: rgba(242, 178, 98, 0.55);
  background: rgba(242, 178, 98, 0.07);
}

.page-about .about-rail__num {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.page-about .about-nodes {
  display: grid;
  gap: var(--about-node-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  position: relative;
  padding-left: 26px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: calc(-1 * var(--about-node-gap));
  width: 1px;
  background: linear-gradient(180deg, rgba(42, 90, 99, 0.95), rgba(42, 90, 99, 0.12));
}

.page-about .about-node:last-child::before {
  bottom: 0;
}

.page-about .about-node__dot {
  position: absolute;
  left: -4px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(228, 118, 42, 0.15);
}

.page-about .about-node__year {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--teal);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.15rem, 3.2vw, 1.55rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.98rem;
  line-height: 1.88;
  color: var(--about-body);
}

.page-about .about-node__note {
  margin: 16px 0 0;
  padding-top: 12px;
  max-width: 66ch;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--cold);
}

.page-about .about-node__figure {
  margin: 20px 0 0;
  max-width: 620px;
}

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

.page-about .about-node__figure .media-frame__cap {
  color: var(--cold);
}

/* ---------- 规模数字 ---------- */
.page-about .about-scale {
  background: var(--fog);
  color: var(--ink);
  padding-block: 52px 58px;
}

.page-about .about-scale__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-scale__lead {
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-scale .eyebrow {
  color: var(--dai);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line-light);
  border: 1px solid var(--about-line-light);
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  padding: 20px 16px 22px;
}

.page-about .about-scale__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--dai);
}

.page-about .about-scale__item:nth-child(3) .about-scale__num,
.page-about .about-scale__item:nth-child(6) .about-scale__num {
  color: var(--orange);
}

.page-about .about-scale__label {
  display: block;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--bridge);
}

/* ---------- 通栏视觉 ---------- */
.page-about .about-visual {
  background: var(--ink);
}

.page-about .about-visual__frame {
  max-width: 1400px;
  margin: 0 auto;
  border-bottom: 1px solid var(--rule);
}

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

.page-about .about-visual__cap {
  padding: 14px 20px 18px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--cold);
}

/* ---------- 维护团队 ---------- */
.page-about .about-team {
  background: var(--paper);
  color: var(--bridge);
  padding-block: 52px 58px;
}

.page-about .about-team__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-team h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-team .eyebrow {
  color: var(--dai);
}

.page-about .about-team__lead {
  margin: 16px 0 0;
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .about-team__roles {
  display: grid;
  gap: 0;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-light);
}

.page-about .about-team__roles li {
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line-light);
}

.page-about .about-team__roles h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--dai);
}

.page-about .about-team__roles p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

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

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

.page-about .about-team__figure .media-frame__cap {
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  background: var(--fog);
  color: var(--bridge);
  padding-block: 52px 58px;
}

.page-about .about-partners h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-partners .eyebrow {
  color: var(--dai);
}

.page-about .about-partners__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .about-partners__list {
  display: grid;
  gap: 26px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__list h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--dai);
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-partners__count {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .about-partners__cta {
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--about-line-light);
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-partners__cta a {
  color: var(--dai);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-partners__cta a:hover,
.page-about .about-partners__cta a:focus-visible {
  color: var(--orange);
}

/* ---------- 长期可用 ---------- */
.page-about .about-durability {
  background: var(--ink);
  border-top: 1px solid var(--rule);
  padding-block: 52px 60px;
}

.page-about .about-durability h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-durability__list {
  display: grid;
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-durability__list li {
  background: var(--bridge);
  padding: 22px 18px 24px;
}

.page-about .about-durability__index {
  display: block;
  margin-bottom: 12px;
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--teal);
}

.page-about .about-durability__list h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-durability__list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(237, 241, 242, 0.74);
}

/* ---------- 出口 ---------- */
.page-about .about-next {
  background: var(--bridge);
  padding-block: 48px 60px;
}

.page-about .about-next__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-next h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.45rem, 4vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-next__text .eyebrow {
  color: var(--amber);
}

.page-about .about-next__text p {
  margin: 14px 0 0;
  font-size: 0.94rem;
  line-height: 1.85;
  color: rgba(237, 241, 242, 0.76);
}

.page-about .about-next__links {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.page-about .about-next__links li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-next__links a {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--teal);
  text-decoration: none;
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  color: var(--amber);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-next__links span {
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(237, 241, 242, 0.7);
}

/* ---------- 显现效果 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translate3d(0, 12px, 0);
    transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
  }

  .page-about [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 窄屏调整 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__frame {
    padding: 26px 14px 28px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__strip li {
    margin-right: 16px;
    padding-right: 16px;
  }
}

/* ---------- 中等屏 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero__frame {
    margin: 26px 0 56px;
    padding: 40px 34px 42px;
  }

  .page-about .about-next__links li {
    grid-template-columns: minmax(140px, 176px) minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .about-origin {
    padding-block: 68px 74px;
  }

  .page-about .about-scale,
  .page-about .about-team,
  .page-about .about-partners {
    padding-block: 66px 72px;
  }

  .page-about .about-timeline,
  .page-about .about-durability {
    padding-block: 66px 76px;
  }

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

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

  .page-about .about-partners__list li {
    padding: 4px 24px 4px 24px;
    border-left: 1px solid var(--about-line-light);
  }

  .page-about .about-partners__list li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-partners__list li:last-child {
    padding-right: 0;
  }

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

/* ---------- 桌面：非对称双栏与时间轴索引 ---------- */
@media (min-width: 1000px) {
  .page-about .about-origin__inner {
    grid-template-columns: minmax(240px, 4fr) minmax(0, 7fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-origin__head h2 {
    margin-top: 12px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 60px;
    margin-top: 40px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-left: 1px solid var(--rule-strong);
  }

  .page-about .about-rail__link {
    margin-left: -1px;
    padding: 10px 16px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(242, 178, 98, 0.06);
    border-left-color: var(--amber);
    border-radius: 0;
  }

  .page-about .about-rail__link:target,
  .page-about .about-rail__link:focus {
    color: var(--amber);
    border-left-color: var(--orange);
  }

  .page-about .about-node:nth-child(even) {
    padding-left: 44px;
  }

  .page-about .about-node:nth-child(even)::before {
    left: 18px;
  }

  .page-about .about-node:nth-child(even) .about-node__dot {
    left: 14px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .about-next__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-hero__anno {
    display: block;
    position: absolute;
    right: 8px;
    top: 44px;
    writing-mode: vertical-rl;
    font-size: 0.68rem;
    letter-spacing: 0.32em;
    color: var(--mist);
    pointer-events: none;
  }

  .page-about .about-hero__frame {
    padding: 46px 72px 46px 40px;
  }
}
<<<END>>>