.page-about {
  --ab-gap: clamp(18px, 2.6vw, 32px);
  display: block;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .about-shell {
  max-width: var(--wrap-w);
  margin-inline: auto;
  padding: 0 clamp(16px, 3.2vw, 40px) clamp(48px, 8vw, 96px);
}

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

/* ---------- 坐标刻度带 ---------- */
.page-about .about-rail {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 0;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line-hair);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--signal);
  border: 1px solid var(--line);
  padding: 4px 7px;
}

.page-about .about-rail__item {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
  text-decoration: none;
  padding: 5px 9px;
  border: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  color: var(--paper);
  border-color: var(--signal);
  background: rgba(255, 107, 26, 0.08);
  outline: none;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  margin: 22px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-crumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  padding: clamp(28px, 5vw, 64px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--signal);
}

.page-about .about-intro h1 {
  margin: 0 0 20px;
  font-size: clamp(32px, 6.2vw, 64px);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.page-about .about-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  background: var(--line-hair);
  border: 1px solid var(--line-hair);
}

.page-about .about-facts__item {
  background: var(--ink-900);
  padding: 14px 16px 16px;
  min-width: 0;
}

.page-about .about-facts dt {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-facts__unit {
  font-size: 12px;
  color: var(--signal-soft);
  margin-left: 3px;
  letter-spacing: 0.1em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(36px, 6vw, 88px) 0;
  border-bottom: 1px solid var(--line-hair);
  scroll-margin-top: calc(var(--hdr-h) + 20px);
}

.page-about .about-sec__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--signal);
  border: 1px solid var(--line);
  padding: 5px 7px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about [data-section][data-active] .about-sec__num {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
}

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

.page-about .about-sec__head h2 {
  margin: 0;
  font-size: clamp(21px, 3vw, 32px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.005em;
}

.page-about .about-sec__kicker {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--mist);
}

/* ---------- 双栏与正文 ---------- */
.page-about .about-grid {
  display: grid;
  gap: var(--ab-gap);
  min-width: 0;
}

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

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

.page-about .about-copy p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-copy p:first-child {
  color: var(--paper);
}

.page-about .about-copy--lead {
  margin: 0 0 clamp(20px, 3vw, 28px);
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-formula {
  margin: 24px 0 0 !important;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--signal);
  font-family: var(--font-mono);
  font-size: clamp(16px, 2.2vw, 22px);
  letter-spacing: 0.08em;
  color: var(--signal-soft) !important;
}

/* ---------- 图片 ---------- */
.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(0deg, transparent 0 39px, var(--line-hair) 39px 40px),
    repeating-linear-gradient(90deg, transparent 0 39px, var(--line-hair) 39px 40px),
    linear-gradient(160deg, var(--ink-800), var(--ink-700));
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .about-fig--wide .figure__media img {
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-fig--portrait .figure__media img {
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.page-about .about-fig--square .figure__media img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 24px 20px;
  border-left: 1px solid var(--line-soft);
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--signal);
  transition: transform 160ms var(--ease), background 160ms var(--ease);
}

.page-about .tl-node__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.12em;
  color: var(--signal-soft);
}

.page-about .tl-node__title {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .tl-node__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tl-node:hover::before {
  transform: scale(1.5);
  background: var(--pitch);
}

/* ---------- 数据工坊流程 ---------- */
.page-about .about-fig--wide {
  margin-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .flow__item {
  background: var(--ink-900);
  padding: clamp(16px, 2.4vw, 26px);
  transition: background 160ms var(--ease);
}

.page-about .flow__item:hover {
  background: var(--ink-800);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--signal);
}

.page-about .flow__item h3 {
  margin: 10px 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-metrics {
  display: grid;
  gap: 1px;
  margin-top: 1px;
  background: var(--line-hair);
  border: 1px solid var(--line-hair);
  border-top: 0;
}

.page-about .about-metrics__item {
  background: var(--ink-800);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.05;
  color: var(--signal);
  letter-spacing: 0.02em;
}

.page-about .about-metrics__unit {
  font-size: 13px;
  color: var(--signal-soft);
  margin-left: 3px;
  letter-spacing: 0.08em;
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  border: 1px solid var(--line);
  padding: clamp(14px, 2vw, 22px);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
}

.page-about .crew-bar {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .crew-seg {
  transition: fill 160ms var(--ease), opacity 160ms var(--ease);
}

.page-about .crew-seg--eng {
  fill: var(--signal);
}

.page-about .crew-seg--content {
  fill: var(--ink-600);
}

.page-about .crew-seg--ops {
  fill: var(--pitch);
}

.page-about .crew-seg:hover {
  opacity: 0.75;
}

.page-about .crew-legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .crew-legend__row {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  border-top: 1px solid var(--line-hair);
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .crew-legend__row:first-child {
  border-top: 0;
}

.page-about .crew-legend__row:hover {
  background: var(--ink-700);
  transform: translateY(-2px);
}

.page-about .crew-legend__dot {
  width: 8px;
  height: 8px;
  display: block;
  background: var(--mist);
}

.page-about .crew-legend__row--eng .crew-legend__dot {
  background: var(--signal);
}

.page-about .crew-legend__row--content .crew-legend__dot {
  background: var(--ink-600);
}

.page-about .crew-legend__row--ops .crew-legend__dot {
  background: var(--pitch);
}

.page-about .crew-legend__key {
  font-size: 14px;
  color: var(--paper);
}

.page-about .crew-legend__val,
.page-about .crew-legend__pct {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .crew-legend__pct {
  color: var(--signal-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .eco-list__item {
  display: grid;
  grid-template-columns: minmax(62px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-hair);
}

.page-about .eco-list__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  color: var(--signal);
  letter-spacing: 0.02em;
}

.page-about .eco-list__item--year .eco-list__num {
  color: var(--paper);
  font-size: clamp(16px, 2.2vw, 20px);
}

.page-about .eco-list__txt {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 后续入口 ---------- */
.page-about .about-next {
  padding: clamp(36px, 6vw, 80px) 0 0;
}

.page-about .about-next h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.3;
}

.page-about .about-next__text {
  margin: 0 0 clamp(20px, 3vw, 28px);
  font-size: 15px;
  color: var(--mist);
  max-width: 56ch;
}

.page-about .about-next__links {
  display: grid;
  gap: 1px;
  background: var(--line-hair);
  border: 1px solid var(--line-hair);
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--ink-900);
  padding: 15px 18px;
  font-size: 15px;
  color: var(--paper);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .about-next__link span {
  color: var(--signal);
  font-family: var(--font-mono);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--ink-800);
  color: var(--signal-soft);
  padding-left: 24px;
  outline: none;
}

.page-about .about-next__link:focus-visible {
  box-shadow: inset 0 0 0 1px var(--signal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-grid--method {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.72fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-grid--crew {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-grid--eco {
    grid-template-columns: minmax(0, 0.58fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .tl {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: clamp(12px, 1.6vw, 22px);
  }

  .page-about .tl-node {
    border-left: 0;
    border-top: 1px solid var(--line-soft);
    padding: 18px 8px 0 0;
    transition: transform 160ms var(--ease), border-color 160ms var(--ease);
  }

  .page-about .tl-node::before {
    left: 0;
    top: -4px;
  }

  .page-about .tl-node:hover {
    transform: translateY(-2px);
    border-top-color: var(--signal);
  }

  .page-about .tl-node__year {
    font-size: 22px;
  }
}

@media (min-width: 1040px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    column-gap: clamp(22px, 3vw, 46px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--hdr-h) + 20px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    margin-bottom: 0;
    padding: 24px 12px 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-hair);
    overflow: visible;
  }

  .page-about .about-rail__item {
    text-align: center;
  }

  .page-about .about-sec__head {
    gap: 16px;
  }

  .page-about .about-sec__num {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: 0.3em;
    padding: 12px 5px;
    align-self: stretch;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item,
  .page-about .about-crumbs a,
  .page-about .about-sec__num,
  .page-about .tl-node,
  .page-about .tl-node::before,
  .page-about .flow__item,
  .page-about .crew-seg,
  .page-about .crew-legend__row,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .crew-legend__row:hover {
    transform: none;
  }
}
<<<END>>>