.page-about {
  --about-rule: #DDE2EC;
  --about-gap: 44px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

.page-about .link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t), color var(--t);
}

.page-about .link:hover {
  color: var(--indigo);
  border-bottom-color: var(--cyan);
}

/* ---------------- 页头 ---------------- */

.page-about .about-head {
  position: relative;
  overflow: hidden;
  padding: 104px 0 64px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .about-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(27, 42, 91, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 42, 91, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
  pointer-events: none;
}

.page-about .about-head .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 36px;
}

.page-about .about-head__eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--blue);
  margin: 0;
}

.page-about .about-head__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.6vw, 58px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

.page-about .about-head__lede {
  margin: 26px 0 0;
  max-width: 760px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-head__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------------- 通用章节排版 ---------------- */

.page-about .chapter {
  max-width: 760px;
  margin-bottom: 44px;
}

.page-about .chapter__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .chapter__title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--indigo);
}

.page-about .chapter__lede {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 01 谁在用 ---------------- */

.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-intro__card {
  background: var(--white);
  padding: 28px 24px 30px;
  border-top: 3px solid var(--cyan);
  transition: background var(--t);
}

.page-about .about-intro__card:nth-child(2) {
  border-top-color: var(--indigo);
}

.page-about .about-intro__card:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .about-intro__card:hover {
  background: #FBF9F4;
}

.page-about .about-intro__tag {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-intro__title {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.45;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .about-intro__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.86;
}

/* ---------------- 02 时间轴 ---------------- */

.page-about .about-history {
  position: relative;
}

.page-about .about-timeline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.1;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-ruler,
.page-about .about-axis {
  position: relative;
  z-index: 1;
}

.page-about .about-ruler {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-ruler__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
}

.page-about .about-ruler__link {
  display: inline-block;
  padding: 6px 13px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  background: var(--white);
  border: 1px solid var(--about-rule);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t), border-color var(--t);
}

.page-about .about-ruler__link:hover,
.page-about .about-ruler__link:focus-visible {
  color: var(--indigo);
  border-color: var(--cyan);
}

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

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--about-rule);
}

.page-about .about-axis__item {
  position: relative;
  padding: 0 0 40px 42px;
}

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

.page-about .about-axis__dot {
  position: absolute;
  left: 0;
  top: 24px;
  width: 15px;
  height: 15px;
  background: var(--indigo);
}

.page-about .about-axis__item--now .about-axis__dot {
  background: var(--orange);
}

.page-about .about-axis__card {
  background: var(--white);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--cyan);
  padding: 20px 22px 24px;
  transition: border-color var(--t), transform var(--t);
}

.page-about .about-axis__item--now .about-axis__card {
  border-top-color: var(--orange);
}

.page-about .about-axis__card:hover {
  transform: translateY(-2px);
}

.page-about .about-axis__year {
  margin: 0 0 8px;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.page-about .about-axis__title {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .about-axis__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  opacity: 0.84;
}

/* ---------------- 03 栏目维护 ---------------- */

.page-about .about-maintain__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

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

.page-about .about-maintain .list-index__item {
  position: relative;
  padding: 22px 0 24px 46px;
  border-bottom: 1px solid var(--about-rule);
  transition: padding-left var(--t);
}

.page-about .about-maintain .list-index__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 24px;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--t);
}

.page-about .about-maintain .list-index__item:hover::before {
  transform: scaleY(1);
}

.page-about .about-maintain .list-index__no {
  position: absolute;
  left: 14px;
  top: 24px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-maintain .list-index__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .about-maintain .list-index__meta {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-maintain__figure {
  margin: 0;
  border: 1px solid var(--about-rule);
  background: var(--white);
  padding: 18px;
}

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

.page-about .about-maintain__figure .media__caption {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------------- 04 团队 ---------------- */

.page-about .about-team .chapter__num {
  color: var(--orange);
}

.page-about .about-team .chapter__title {
  color: var(--white);
}

.page-about .about-team .chapter__lede {
  color: var(--on-dark);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  padding: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(201, 211, 232, 0.24);
}

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

.page-about .about-team__figure .media__caption {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-dark-dim);
}

.page-about .about-team__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .about-team__row {
  padding-left: 14px;
  border-left: 2px solid transparent;
  transition: border-color var(--t);
}

.page-about .about-team__row:hover {
  border-left-color: var(--cyan);
}

.page-about .about-team__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__role {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__num {
  font-size: 14px;
  color: var(--cyan);
}

.page-about .about-team__bar {
  display: block;
  height: 8px;
  margin: 10px 0 10px;
  background: var(--cyan);
  transition: opacity var(--t);
}

.page-about .about-team__row:nth-child(1) .about-team__bar { width: 43.75%; }
.page-about .about-team__row:nth-child(2) .about-team__bar { width: 28.13%; background: var(--blue); }
.page-about .about-team__row:nth-child(3) .about-team__bar { width: 15.63%; background: var(--orange); }
.page-about .about-team__row:nth-child(4) .about-team__bar { width: 12.5%; background: var(--on-dark-dim); }

.page-about .about-team__row:hover .about-team__bar {
  opacity: 0.72;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--on-dark);
}

/* ---------------- 05 体量 ---------------- */

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 26px 22px 28px;
  background: var(--white);
}

.page-about .about-scale__num {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--indigo);
}

.page-about .about-scale__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-scale__note {
  margin: 30px 0 0;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 06 接下来 ---------------- */

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

.page-about .about-next__item {
  background: var(--white);
  padding: 26px 24px 30px;
  border-bottom: 3px solid var(--indigo);
  transition: border-bottom-color var(--t);
}

.page-about .about-next__item:hover {
  border-bottom-color: var(--orange);
}

.page-about .about-next__no {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .about-next__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 720px) {
  .page-about .about-intro__grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .page-about .about-team__grid {
    grid-template-columns: 1fr 1fr;
    gap: 44px;
  }

  .page-about .about-maintain__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .about-head {
    padding: 132px 0 84px;
  }

  .page-about .about-timeline {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-ruler {
    position: sticky;
    top: 116px;
    align-self: start;
    overflow: visible;
  }

  .page-about .about-ruler__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-ruler__link {
    display: block;
    padding: 12px 0 12px 16px;
    background: transparent;
    border: 0;
    position: relative;
  }

  .page-about .about-ruler__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 8px;
    height: 1px;
    background: var(--about-rule);
    transition: width var(--t), background var(--t);
  }

  .page-about .about-ruler__link:hover::before {
    width: 16px;
    background: var(--cyan);
  }

  .page-about .about-ruler__link:hover {
    color: var(--indigo);
  }

  .page-about .about-axis::before {
    left: 50%;
  }

  .page-about .about-axis__item {
    width: calc(50% - 44px);
    padding: 0 0 48px 0;
    text-align: right;
  }

  .page-about .about-axis__item:nth-child(even) {
    margin-left: auto;
    text-align: left;
  }

  .page-about .about-axis__item:nth-child(even) {
    padding-bottom: 48px;
  }

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

  .page-about .about-axis__dot {
    left: auto;
    right: -52px;
  }

  .page-about .about-axis__item:nth-child(even) .about-axis__dot {
    left: -52px;
    right: auto;
  }
}

@media (min-width: 1180px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-intro__card,
  .page-about .about-axis__card,
  .page-about .about-maintain .list-index__item,
  .page-about .about-maintain .list-index__item::before,
  .page-about .about-team__row,
  .page-about .about-team__bar,
  .page-about .about-next__item,
  .page-about .about-ruler__link {
    transition: none;
  }

  .page-about .about-axis__card:hover {
    transform: none;
  }
}
<<<END>>>