.page-about {
  display: block;
  padding-bottom: 96px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-wrap {
  padding-top: 26px;
}

/* ---------- 首屏声明 ---------- */
.page-about .about-lead {
  display: grid;
  gap: 20px;
  padding-top: 32px;
  padding-bottom: 52px;
}

.page-about .about-lead__title {
  margin: 0;
  font-size: clamp(32px, 8vw, 62px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 18em;
}

.page-about .about-lead__lede {
  margin: 0;
  max-width: 40em;
  color: var(--grey);
  line-height: 1.85;
}

.page-about .about-lead__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 20px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-lead__stats .stat {
  background: var(--panel);
  padding: 20px 16px;
  display: grid;
  gap: 6px;
}

.page-about .about-lead__stats .stat__value {
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-lead__stats .stat__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

/* ---------- 主体框架：左索引 + 右内容 ---------- */
.page-about .about-frame {
  display: grid;
  gap: 36px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  color: var(--grey);
}

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

.page-about .about-rail__list a {
  display: inline-block;
  white-space: nowrap;
  color: var(--grey);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding-bottom: 6px;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 内容流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 52px;
  background-image:
    linear-gradient(rgba(42, 51, 69, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 51, 69, 0.32) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
}

.page-about .about-block {
  display: grid;
  gap: 16px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(23px, 5vw, 36px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 20em;
}

.page-about .about-block__intro {
  margin: 0;
  max-width: 40em;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-prose {
  display: grid;
  gap: 16px;
  max-width: 42em;
}

.page-about .about-prose p {
  margin: 0;
  color: var(--grey);
  line-height: 1.85;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--ice), rgba(111, 168, 255, 0.08));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 7px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--ice);
  box-shadow: 0 0 0 4px rgba(111, 168, 255, 0.12), 0 0 14px rgba(111, 168, 255, 0.45);
}

.page-about .about-timeline__time {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-timeline__name {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 42em;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 图片 ---------- */
.page-about .about-photo {
  margin: 14px 0 0;
}

.page-about .about-photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-photo--wide img { aspect-ratio: 8 / 3; }
.page-about .about-photo--team img { aspect-ratio: 14 / 9; }
.page-about .about-photo--city img { aspect-ratio: 14 / 9; }

.page-about .about-photo__caption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

/* ---------- 团队比例条 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .team-bar {
  display: grid;
  gap: 9px;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .team-bar__name {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 800;
  color: var(--white);
}

.page-about .team-bar__num {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .team-bar__unit {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .team-bar__track {
  height: 6px;
  background: var(--raised);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
}

.page-about .team-bar--eng .team-bar__fill { width: 100%; }
.page-about .team-bar--ana .team-bar__fill { width: 60%; }
.page-about .team-bar--prod .team-bar__fill { width: 53.3%; }
.page-about .team-bar--ops .team-bar__fill { width: 40%; }
.page-about .team-bar--cs .team-bar__fill { width: 26.7%; }

.page-about .team-bar__duty {
  margin: 0;
  max-width: 46em;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 26px;
  margin-top: 6px;
}

.page-about .about-coverage__text {
  display: grid;
  gap: 16px;
}

.page-about .about-coverage__text p {
  margin: 0;
  max-width: 40em;
  color: var(--grey);
  line-height: 1.85;
}

.page-about .about-points {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-points li {
  background: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 4px;
}

.page-about .about-points__k {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  min-width: 62px;
}

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

/* ---------- 合作伙伴 ---------- */
.page-about .partner-figures {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
}

.page-about .partner-figure {
  display: grid;
  grid-template-columns: minmax(80px, 110px) 1fr;
  gap: 8px 20px;
  align-items: baseline;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-figure__num {
  font-family: var(--sans);
  font-size: clamp(44px, 12vw, 78px);
  font-weight: 800;
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-figure__desc {
  margin: 0;
  color: var(--grey);
  font-size: 14px;
  line-height: 1.8;
  max-width: 34em;
}

.page-about .partner-figure__desc strong {
  color: var(--white);
  font-weight: 800;
}

.page-about .about-honor {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  padding: 22px 20px;
  background: var(--panel);
  border-left: 3px solid var(--magenta);
}

.page-about .about-honor__num {
  margin: 0;
  font-size: clamp(30px, 7vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--magenta);
}

.page-about .about-honor__text {
  margin: 0;
  max-width: 40em;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 数据链路 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .flow-step__num {
  font-family: var(--mono);
  font-size: clamp(26px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  opacity: 0.55;
  font-variant-numeric: tabular-nums;
}

.page-about .flow-step__body {
  display: grid;
  gap: 8px;
}

.page-about .flow-step__name {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
}

.page-about .flow-step__text {
  margin: 0;
  max-width: 42em;
  color: var(--grey);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: 72px;
}

.page-about .about-next__inner {
  display: grid;
  gap: 22px;
  padding: 30px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 10px 0 0;
  font-size: clamp(22px, 5vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 16em;
}

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

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-lead__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-lead__stats .stat {
    padding: 24px 20px;
  }

  .page-about .about-flow {
    background-size: 48px 48px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-frame {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-rail {
    border-top: 0;
    border-bottom: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__label {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-rail__list a {
    display: block;
    padding: 3px 0 3px 12px;
    border-bottom: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--cyan);
    border-bottom-color: transparent;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 104px;
  }

  .page-about .about-flow {
    gap: 72px;
  }

  .page-about .about-block--offset {
    margin-left: 7%;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-photo--team,
  .page-about .about-photo--wide {
    margin-top: 20px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-frame {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 80px;
  }

  .page-about .about-block--offset {
    margin-left: 10%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .team-bar__fill {
    transition: none;
  }
}
<<<END>>>