.page-about {
  --about-hair: 1px solid var(--rule-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  padding-block: 42px 46px;
  border-bottom: var(--about-hair);
}

.page-about .about-kicker {
  margin: 26px 0 20px;
  color: var(--lake-bright);
}

.page-about .about-title {
  margin: 0;
  max-width: 17em;
  font-size: clamp(2rem, 6.4vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: -.012em;
}

.page-about .about-lede {
  margin: 28px 0 0;
  max-width: 36em;
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 46px;
  margin: 40px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--rule-faint);
  list-style: none;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.page-about .about-facts__num {
  font-size: var(--step-5);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-facts__txt {
  font-size: var(--step-2);
  color: var(--text-dim);
}

/* ---------- 起步 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 36px;
}

.page-about .about-origin__body .label {
  display: inline-block;
  margin: 0 0 18px;
}

.page-about .about-origin__body .h2 {
  margin: 0 0 22px;
}

.page-about .about-origin__body .prose + .prose {
  margin-top: 18px;
}

.page-about .about-origin__figure {
  aspect-ratio: 10 / 7;
  margin: 0 0 22px;
}

.page-about .about-origin__note {
  padding: 20px 22px 22px;
}

.page-about .about-origin__note .label {
  display: inline-block;
  margin: 0 0 14px;
}

.page-about .about-origin__note-line {
  margin: 0 0 12px;
  font-size: var(--step-2);
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-origin__note-text {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.7;
  color: rgba(15, 20, 24, .68);
}

/* ---------- 内容生产机制（盐湖白纸面） ---------- */
.page-about .section--paper {
  color: var(--ink);
}

.page-about .section--paper .h2,
.page-about .section--paper .h3,
.page-about .section--paper .card__title {
  color: var(--ink);
}

.page-about .section--paper .prose {
  color: rgba(15, 20, 24, .78);
}

.page-about .section--paper .label {
  color: rgba(15, 20, 24, .56);
  border-color: rgba(15, 20, 24, .26);
}

.page-about .section--paper a {
  color: #0b6a61;
}

.page-about .about-engine__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-engine__body .label {
  display: inline-block;
  margin: 0 0 18px;
}

.page-about .about-engine__body .h2 {
  margin: 0 0 22px;
}

.page-about .about-engine__body .prose {
  margin: 0 0 18px;
}

.page-about .about-engine__figure {
  aspect-ratio: 3 / 2;
  margin: 0;
}

.page-about .about-lines {
  list-style: none;
  margin: 26px 0 24px;
  padding: 0;
  border-top: 1px solid rgba(15, 20, 24, .16);
}

.page-about .about-lines__item {
  padding: 20px 0;
  border-bottom: 1px solid rgba(15, 20, 24, .1);
}

.page-about .about-lines__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-lines__idx {
  font-size: var(--step-1);
  letter-spacing: .18em;
  color: #0b6a61;
}

.page-about .about-lines__text {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.75;
  color: rgba(15, 20, 24, .74);
}

/* ---------- 团队 ---------- */
.page-about .about-team__title {
  margin: 14px 0 20px;
  max-width: 24em;
}

.page-about .about-team__lede {
  margin: 0 0 34px;
  max-width: 42em;
}

.page-about .about-team__grid {
  gap: 18px;
}

.page-about .about-team__card {
  padding: 24px 22px 26px;
  border-color: var(--rule-soft);
}

.page-about .about-team__idx {
  margin: 0 0 14px;
  font-size: var(--step-1);
  letter-spacing: .2em;
  color: var(--lake-bright);
}

.page-about .about-team__card .card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--step-5);
}

.page-about .about-team__size {
  margin: 0 0 14px;
  font-size: var(--step-3);
  font-weight: 700;
}

.page-about .about-team__text {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.75;
  color: rgba(15, 20, 24, .74);
}

.page-about .about-team__foot {
  margin: 30px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--rule-faint);
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__title {
  margin: 14px 0 40px;
}

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

.page-about .timeline__item {
  position: relative;
  padding: 0 0 38px 34px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: -6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lake), var(--rule-faint));
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__node {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--lake);
}

.page-about .timeline__year {
  display: block;
  margin: 0 0 8px;
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--data);
}

.page-about .timeline__item .h3 {
  margin: 0 0 10px;
  font-size: var(--step-4);
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 40em;
  font-size: var(--step-3);
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__figure {
  margin: 0 0 34px;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-partners__body .label {
  display: inline-block;
  margin: 0 0 18px;
}

.page-about .about-partners__body .h2 {
  margin: 0 0 22px;
}

.page-about .about-partners__body .prose + .prose {
  margin-top: 18px;
}

.page-about .about-partners__stat {
  align-self: start;
  padding: 26px 24px 24px;
  border: 1px solid var(--rule-soft);
  background: rgba(18, 167, 154, .07);
}

.page-about .about-partners__stat-num {
  margin: 0;
  font-size: clamp(2.6rem, 9vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--data);
}

.page-about .about-partners__stat-num span {
  font-size: .55em;
  vertical-align: super;
}

.page-about .about-partners__stat-label {
  margin: 16px 0 0;
  font-size: var(--step-2);
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise__title {
  margin: 14px 0 32px;
}

.page-about .about-promise__card {
  padding: 8px 24px 10px;
}

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

.page-about .about-promise__row {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(15, 20, 24, .1);
}

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

.page-about .about-promise__row dt {
  font-family: var(--font-display);
  font-size: var(--step-4);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-promise__row dd {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.75;
  color: rgba(15, 20, 24, .75);
}

.page-about .about-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, .9fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-engine__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, .8fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-promise__row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1040px) {
  .page-about .about-mast {
    padding-block: 60px 58px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.75fr) minmax(0, .85fr);
    gap: 72px;
  }

  .page-about .about-engine__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 72px;
  }

  .page-about .about-engine__figure {
    position: sticky;
    top: 88px;
  }

  .page-about .about-partners__grid {
    gap: 80px;
  }
}

/* ---------- 动效退让 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-origin__figure,
  .page-about .about-engine__figure,
  .page-about .about-partners__figure {
    position: static;
  }
}
<<<END>>>