.page-about {
  --about-block: clamp(56px, 8vw, 96px);
  --about-tight: clamp(32px, 5vw, 56px);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: var(--about-block);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: clamp(20px, 3vw, 32px) 0 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}
.page-about .breadcrumb a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--sky);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--stone);
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 40px);
}
.page-about .about-hero__kicker {
  color: var(--stone);
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.page-about .about-hero__title {
  margin: 0 0 clamp(24px, 4vw, 40px);
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(38px, 7vw, 96px);
  line-height: .98;
  letter-spacing: -.03em;
}
.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

/* 关键数字横排 */
.page-about .about-figures {
  margin-top: clamp(40px, 6vw, 72px);
  background: var(--night);
  color: var(--paper);
  padding: clamp(36px, 5vw, 56px) 0;
}
.page-about .about-figures__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 40px);
}
.page-about .about-figures__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--line-invert);
}
.page-about .about-figures__num {
  font-family: var(--mono);
  font-weight: 500;
  font-size: clamp(32px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--gold);
  align-self: flex-start;
}
.page-about .about-figures__unit {
  font-size: .55em;
  margin-left: 2px;
}
.page-about .about-figures__label {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
  color: var(--cloud);
}

/* 章节通用头部 */
.page-about .about-sec {
  margin: 0 0 clamp(28px, 4vw, 44px);
}
.page-about .about-sec__kicker {
  color: var(--saffron);
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.page-about .about-sec__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.25;
  letter-spacing: -.01em;
}
.page-about .about-sec__note {
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--stone);
}

/* 时间轴 */
.page-about .about-timeline {
  padding-top: var(--about-block);
}
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}
.page-about .tl__item {
  position: relative;
  padding-left: 40px;
  margin-bottom: clamp(24px, 3vw, 36px);
}
.page-about .tl__item:last-child {
  margin-bottom: 0;
}
.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 18px;
  width: 15px;
  height: 15px;
  background: var(--gold);
  border: 1px solid var(--ink);
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}
.page-about .tl__item:hover .tl__dot {
  background: var(--saffron);
  transform: scale(1.15);
}
.page-about .tl__card {
  border: 1px solid var(--line);
  background: var(--ice);
  padding: clamp(18px, 2.4vw, 28px);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}
.page-about .tl__item:nth-child(odd) .tl__card {
  max-width: 44em;
}
.page-about .tl__item:nth-child(even) .tl__card {
  max-width: 36em;
  margin-left: clamp(0px, 6vw, 96px);
}
.page-about .tl__card:hover {
  border-color: var(--line-strong);
  transform: translateX(4px);
}
.page-about .tl__season {
  margin: 0 0 10px;
  color: var(--sky);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.page-about .tl__title {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.4;
}
.page-about .tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* 团队 */
.page-about .about-team {
  padding-top: var(--about-block);
}
.page-about .about-team__inner {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .about-team__groups {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .about-team__group {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 8px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .about-team__idx {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: .1em;
  padding-top: 4px;
  border-bottom: 1px solid var(--gold);
  align-self: start;
}
.page-about .about-team__name {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .02em;
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}
.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;
  border: 1px solid var(--line);
}
.page-about .about-team__cap {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--stone);
}

/* 服务网络 */
.page-about .about-network {
  margin-top: var(--about-block);
  background: var(--cloud);
  padding: clamp(40px, 6vw, 72px) 0;
}
.page-about .about-network__figure {
  margin: 0 0 clamp(32px, 4vw, 48px);
}
.page-about .about-network__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}
.page-about .about-network__split {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .about-network__text p {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
}
.page-about .about-network__text .about-sec__title {
  color: var(--ink);
}
.page-about .about-network__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}
.page-about .about-network__stats dt {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--sky);
  text-transform: uppercase;
}
.page-about .about-network__stats dd {
  margin: 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
}
.page-about .about-network__map {
  background: var(--paper);
  border: 1px solid var(--line-strong);
  padding: clamp(16px, 2.5vw, 28px);
}
.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  color: var(--sky);
}
.page-about .about-map__links {
  opacity: .4;
}
.page-about .about-map__node circle {
  fill: var(--sky);
  transition: fill 180ms var(--ease);
}
.page-about .about-map__node text {
  font-family: var(--sans);
  font-size: 14px;
  fill: var(--ink);
  letter-spacing: .02em;
}
.page-about .about-map__node:hover circle {
  fill: var(--saffron);
}
.page-about .about-map__note {
  margin: 14px 0 0;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--stone);
}

/* 做事方式 */
.page-about .about-rules {
  padding-top: var(--about-block);
}
.page-about .about-rules__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}
.page-about .about-rules__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
}
.page-about .about-rules__num {
  color: var(--saffron);
  font-size: 13px;
  letter-spacing: .12em;
  padding-top: 4px;
}
.page-about .about-rules__title {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.4;
}
.page-about .about-rules__body p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

/* 合作生态 */
.page-about .about-partners {
  margin-top: var(--about-block);
  background: var(--ice);
  padding: clamp(40px, 6vw, 72px) 0;
}
.page-about .about-partners__inner {
  display: grid;
  gap: clamp(32px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .about-partners__figure {
  margin: 0;
}
.page-about .about-partners__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-strong);
}
.page-about .about-partners__list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}
.page-about .about-partners__item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .about-partners__item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .about-partners__item h3 {
  margin: 0 0 8px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .02em;
}
.page-about .about-partners__item p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}
.page-about .about-partners__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}
.page-about .about-partners__cta p {
  margin: 0;
  max-width: 26em;
  font-size: 15px;
  line-height: 1.8;
}
.page-about .about-partners__cta .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* 延伸入口 */
.page-about .about-next {
  padding-top: var(--about-block);
}
.page-about .about-next__kicker {
  margin: 0 0 20px;
  color: var(--stone);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}
.page-about .about-next__list li {
  border-bottom: 1px solid var(--line);
}
.page-about .about-next__list a {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 6px 20px;
  padding: 18px 0;
  text-decoration: none;
  color: var(--ink);
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}
.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--saffron);
  padding-left: 8px;
}
.page-about .about-next__list .mono {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--sky);
  padding-top: 3px;
}
.page-about .about-next__label {
  font-size: 15px;
  line-height: 1.7;
}

/* 媒体查询：平板及以上 */
@media (min-width: 720px) {
  .page-about .about-figures__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-rules__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(24px, 3vw, 40px);
  }
  .page-about .about-rules__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }
  .page-about .about-next__list a {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
  }
}

/* 媒体查询：桌面 */
@media (min-width: 1000px) {
  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }
  .page-about .about-network__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .95fr);
    align-items: start;
  }
  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }
  .page-about .about-next__list a {
    grid-template-columns: 140px minmax(0, 1fr);
  }
}

/* 动效降级 */
@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .tl__dot,
  .page-about .about-next__list a,
  .page-about .about-map__node circle {
    transition: none;
  }
  .page-about .tl__card:hover {
    transform: none;
  }
  .page-about .tl__item:hover .tl__dot {
    transform: none;
  }
  .page-about .about-next__list a:hover,
  .page-about .about-next__list a:focus-visible {
    padding-left: 0;
  }
}
<<<END>>>