.page-about {
  --about-line: var(--rule);
  --about-line-soft: var(--rule-soft);
  background: var(--paper);
  color: var(--ink);
}

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

.page-about .media-frame {
  width: 100%;
  margin: 0;
}

.page-about .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 26px 0 40px;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 24px;
}

.page-about .about-hero h1 {
  margin: 12px 0 18px;
  font-size: clamp(30px, 7.6vw, 56px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.06;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  max-width: 58ch;
}

.page-about .about-hero-side {
  margin-top: 30px;
  padding-top: 6px;
  border-top: 3px solid var(--navy);
}

.page-about .hero-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin: 0;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-fact .mono {
  color: var(--navy);
  font-weight: 500;
  text-align: right;
}

/* ---------- 区块骨架 ---------- */

.page-about .about-block {
  padding: 48px 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-block .section-head {
  margin-bottom: 30px;
}

.page-about .about-block h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 5vw, 40px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.page-about .about-block .lede {
  margin-top: 14px;
  max-width: 56ch;
}

/* ---------- 01 两件事 ---------- */

.page-about .pillar {
  margin-top: 26px;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--navy);
}

.page-about .pillar--accent {
  border-left-color: var(--orange);
}

.page-about .pillar-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.page-about .pillar h3 {
  margin: 0 0 10px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .pillar p {
  margin: 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- 02 阶段轴 ---------- */

.page-about .about-banner {
  aspect-ratio: 16 / 7;
  margin-bottom: 38px;
  border: 1px solid var(--about-line);
}

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

.page-about .phase {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: 38px;
}

.page-about .phase::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 46px;
  bottom: 0;
  width: 1px;
  background: var(--about-line);
}

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

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

.page-about .phase-node {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--navy);
  background: var(--paper);
  color: var(--navy);
  font-size: 13px;
  line-height: 1;
}

.page-about .phase-body {
  padding-top: 2px;
}

.page-about .phase-tag {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .phase-body h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 3.8vw, 27px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.page-about .phase-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 03 团队 ---------- */

.page-about .team-cards {
  margin-top: 6px;
}

.page-about .team-card {
  margin-bottom: 16px;
  padding: 20px 18px 18px;
  background: var(--paper);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--navy);
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--teal);
}

.page-about .team-card:last-child {
  margin-bottom: 0;
}

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

.page-about .team-head h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
}

.page-about .team-count {
  margin: 0;
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  color: var(--navy);
}

.page-about .team-unit {
  margin-left: 3px;
  font-size: 12px;
  color: var(--muted);
}

.page-about .team-desc {
  margin: 10px 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .team-card .disclosure-panel ul {
  margin: 0;
  padding-left: 18px;
}

.page-about .team-card .disclosure-panel li {
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-card .disclosure-panel li:last-child {
  margin-bottom: 0;
}

.page-about .team-figure {
  aspect-ratio: 4 / 3;
  margin-top: 18px;
  border: 1px solid var(--about-line);
}

/* ---------- 04 服务标准 ---------- */

.page-about .std-list {
  margin: 0;
  padding: 0;
  max-width: 840px;
  border-top: 1px solid var(--about-line);
}

.page-about .std-row {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .std-key {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .std-val {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .std-note {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 05 数据来源 ---------- */

.page-about .source-layout {
  row-gap: 26px;
}

.page-about .source-copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .source-copy p:last-child {
  margin-bottom: 0;
}

.page-about .source-figure {
  aspect-ratio: 1 / 1;
  border: 1px solid var(--about-line);
}

/* ---------- 06 备案 ---------- */

.page-about .about-record {
  background: var(--cream);
}

.page-about .record-copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .record-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .record-card {
  margin-top: 24px;
  padding: 4px 0 0;
  border-top: 3px solid var(--navy);
}

.page-about .record-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin: 0;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
  color: var(--navy);
}

.page-about .record-line span:first-child {
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- 收尾 ---------- */

.page-about .about-next {
  background: var(--navy-deep);
  color: var(--paper);
  border-top: 0;
}

.page-about .about-next h2 {
  color: var(--paper);
  font-size: clamp(24px, 5vw, 38px);
}

.page-about .about-next .lede {
  color: var(--orange-mist);
  max-width: 52ch;
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 断点 ---------- */

@media (min-width: 600px) {
  .page-about .about-hero {
    padding: 36px 0 52px;
  }

  .page-about .about-block {
    padding: 56px 0;
  }

  .page-about .std-row {
    grid-template-columns: 168px minmax(0, 1fr);
    column-gap: 24px;
  }

  .page-about .std-key {
    padding-top: 3px;
  }

  .page-about .record-card {
    margin-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 64px;
  }

  .page-about .about-hero-side {
    margin-top: 0;
    padding-left: 22px;
    border-top: 0;
    border-left: 3px solid var(--navy);
  }

  .page-about .about-block {
    padding: 72px 0;
  }

  .page-about .about-block .section-head {
    margin-bottom: 42px;
  }

  .page-about .pillar {
    margin-top: 0;
    padding-left: 24px;
  }

  .page-about .pillar--offset {
    margin-top: 56px;
  }

  .page-about .about-banner {
    margin-bottom: 52px;
  }

  .page-about .phase {
    grid-template-columns: 48px minmax(0, 1fr);
    column-gap: 34px;
    padding-bottom: 92px;
  }

  .page-about .phase::before {
    left: 23px;
    top: 50px;
  }

  .page-about .phase-node {
    width: 48px;
    height: 48px;
    font-size: 14px;
  }

  .page-about .phase-body {
    padding-top: 6px;
  }

  .page-about .team-card:nth-child(2) {
    margin-left: 26px;
  }

  .page-about .team-card:nth-child(3) {
    margin-left: 52px;
  }

  .page-about .team-figure {
    margin-top: 0;
  }

  .page-about .std-row {
    grid-template-columns: 190px minmax(0, 1fr);
    column-gap: 32px;
    padding: 20px 0 20px 16px;
  }

  .page-about .std-row::before {
    content: "";
    position: absolute;
    left: 0;
    top: 14px;
    bottom: 14px;
    width: 3px;
    background: var(--orange);
    transform: scaleY(0);
    transform-origin: top center;
    transition: transform var(--dur) var(--ease);
  }

  .page-about .std-row:hover::before,
  .page-about .std-row:focus-within::before {
    transform: scaleY(1);
  }

  .page-about .std-row:hover .std-key,
  .page-about .std-row:focus-within .std-key {
    color: var(--navy);
  }

  .page-about .source-layout {
    align-items: start;
    row-gap: 0;
  }

  .page-about .record-layout {
    align-items: start;
  }

  .page-about .next-actions {
    margin-top: 0;
    justify-content: flex-end;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .std-note {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 220ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
  }

  .page-about .std-row:hover .std-note,
  .page-about .std-row:focus-within .std-note {
    max-height: 200px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .std-row::before,
  .page-about .std-note {
    transition: none;
  }

  .page-about .std-row:hover::before,
  .page-about .std-row:focus-within::before {
    transform: scaleY(1);
  }
}
<<<END>>>