.page-about {
  --about-rail-w: 216px;
  --about-ink-soft: #C4CBD3;
  --about-paper-soft: #4C5661;
  --about-gap: clamp(28px, 4vw, 56px);
  background: var(--ink);
  color: var(--paper);
}

.page-about .mono {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs { margin-bottom: clamp(20px, 3vw, 34px); }

.page-about .crumbs ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crumbs__item {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .crumbs__item + .crumbs__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--line);
}

.page-about .crumbs__item a {
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: end;
  margin-top: clamp(16px, 3vw, 32px);
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 0.85fr);
  }
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.05;
  font-size: clamp(34px, 6.4vw, 78px);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .meta-chip {
  background: var(--ink);
  padding: 16px 18px;
}

.page-about .meta-chip__k {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .meta-chip__v {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 0.95;
  color: var(--paper);
}

.page-about .meta-chip__u {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-hero__figure {
  margin-top: clamp(32px, 5vw, 60px);
}

/* ---------- 年份坐标轴 ---------- */
.page-about .about-axis__lede,
.page-about .about-roles__lede,
.page-about .about-flow__lede,
.page-about .about-cq__lede,
.page-about .about-seasons__lede {
  margin: 16px 0 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .axis-layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 46px);
}

@media (min-width: 960px) {
  .page-about .axis-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }
}

.page-about .axis-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

@media (min-width: 960px) {
  .page-about .axis-rail {
    position: sticky;
    top: clamp(88px, 12vh, 128px);
    align-self: start;
  }

  .page-about .axis-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 18px;
    border-left: 1px solid var(--line);
  }
}

.page-about .axis-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}

@media (min-width: 960px) {
  .page-about .axis-rail__link {
    position: relative;
    border: 0;
    padding: 13px 8px 13px 0;
    background: none;
  }

  .page-about .axis-rail__link::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 50%;
    width: 9px;
    height: 1px;
    background: var(--muted);
    transform: translateY(-50%);
    transition: width 220ms var(--ease), left 220ms var(--ease), background 220ms var(--ease);
  }
}

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

@media (min-width: 960px) {
  .page-about .axis-rail__link:hover::before,
  .page-about .axis-rail__link:focus-visible::before {
    width: 26px;
    left: -18px;
    background: var(--pulse);
  }
}

.page-about .axis-rail__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
}

.page-about .axis-rail__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .axis-main {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .axis-node {
  position: relative;
  padding: clamp(26px, 4vw, 42px) 0 clamp(26px, 4vw, 42px) clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

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

.page-about .axis-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(clamp(26px, 4vw, 42px) + 14px);
  width: 8px;
  height: 2px;
  background: var(--node-color, var(--line));
}

.page-about .axis-node--spring { --node-color: var(--spring); }
.page-about .axis-node--summer { --node-color: var(--summer); }
.page-about .axis-node--autumn { --node-color: var(--autumn); }
.page-about .axis-node--winter { --node-color: var(--winter); }

.page-about .axis-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--node-color, var(--muted));
}

.page-about .axis-node__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .axis-node__text {
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

.page-about .axis-node__link {
  color: var(--winter);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 194, 240, 0.4);
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .axis-node__link:hover,
.page-about .axis-node__link:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

/* ---------- 团队职能地图 ---------- */
.page-about .role-map {
  display: grid;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .role-map { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1120px) {
  .page-about .role-map { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .role-map__item {
  position: relative;
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(22px, 2.6vw, 30px);
  background: var(--ink-raise);
  transition: background 240ms var(--ease);
}

.page-about .role-map__item::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: var(--role, var(--muted));
  transform: scaleX(0.2);
  transform-origin: left center;
  transition: transform 300ms var(--ease);
}

.page-about .role-map__item:hover::before,
.page-about .role-map__item:focus-within::before { transform: scaleX(1); }

.page-about .role-map__item--ops { --role: var(--spring); }
.page-about .role-map__item--data { --role: var(--winter); }
.page-about .role-map__item--design { --role: var(--autumn); }
.page-about .role-map__item--service { --role: var(--summer); }

.page-about .role-map__item--ops:hover { background: #16241f; }
.page-about .role-map__item--data:hover { background: #141f28; }
.page-about .role-map__item--design:hover { background: #241f14; }
.page-about .role-map__item--service:hover { background: #241a14; }

.page-about .role-map__mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--role, var(--muted));
}

.page-about .role-map__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .role-map__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(36px, 4.6vw, 54px);
  line-height: 0.9;
  color: var(--role, var(--paper));
}

.page-about .role-map__u {
  margin-left: 6px;
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .role-map__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-roles__note {
  display: block;
  margin-top: 18px;
  color: var(--muted);
}

/* ---------- 数据路径 ---------- */
.page-about .flow {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 46px);
}

@media (min-width: 1000px) {
  .page-about .flow {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
}

.page-about .flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 26px);
  padding: clamp(20px, 2.8vw, 30px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .flow__idx {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--pulse);
}

.page-about .flow__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .flow__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

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

@media (min-width: 1000px) {
  .page-about .flow__fig { position: sticky; top: clamp(88px, 12vh, 128px); }
}

/* ---------- 重庆协作（纸面分区） ---------- */
.page-about .section--paper { color: var(--ink-raise); }

.page-about .section--paper .section__title { color: var(--ink-raise); }

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

.page-about .cq-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 46px);
}

@media (min-width: 1000px) {
  .page-about .cq-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .cq-text p {
  margin: 0;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--about-paper-soft);
}

.page-about .cq-list {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-paper);
}

.page-about .cq-list li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px solid var(--line-paper);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-raise);
}

.page-about .cq-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 10px;
  height: 2px;
  background: var(--summer);
}

.page-about .cq-fig { margin: 0; }

/* ---------- 四季色彩 ---------- */
.page-about .seasons-band {
  display: grid;
  gap: 1px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-block: 1px solid var(--line);
}

@media (min-width: 700px) {
  .page-about .seasons-band { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .page-about .seasons-band { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .season-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(22px, 2.6vw, 32px);
  background: var(--ink);
}

.page-about .season-card__chip {
  width: 38px;
  height: 4px;
  background: var(--season, var(--muted));
}

.page-about .season-card h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--season, var(--paper));
}

.page-about .season-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .season-card .label { color: var(--muted); }

.page-about .season-card--spring { --season: var(--spring); }
.page-about .season-card--summer { --season: var(--summer); }
.page-about .season-card--autumn { --season: var(--autumn); }
.page-about .season-card--winter { --season: var(--winter); }

.page-about .about-seasons__tail {
  margin-top: clamp(24px, 3vw, 36px);
  padding-left: clamp(16px, 2vw, 24px);
  border-left: 2px solid var(--pulse);
}

.page-about .about-seasons__tail p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-ink-soft);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next__panel {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(28px, 4vw, 48px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 900px) {
  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.02em;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.15;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 右缘刻度尺 ---------- */
.page-about .about-gauge {
  display: none;
  position: fixed;
  right: 12px;
  top: 50%;
  z-index: 30;
  flex-direction: column;
  gap: 7px;
  transform: translateY(-50%);
  pointer-events: none;
}

@media (min-width: 1440px) {
  .page-about .about-gauge { display: flex; }
}

.page-about .about-gauge__tick {
  display: block;
  width: 8px;
  height: 1px;
  background: var(--line);
}

.page-about .about-gauge__tick:nth-child(5n + 1) {
  width: 18px;
  background: var(--muted);
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .axis-rail__link,
  .page-about .axis-rail__link::before,
  .page-about .role-map__item,
  .page-about .role-map__item::before {
    transition: none;
  }
}
<<<END>>>