.page-about {
  --about-rail: 208px;
  --about-column-gap: 44px;
  --glass: rgba(18, 35, 60, 0.72);
  --glass-line: rgba(30, 53, 84, 0.92);
  --hairline: rgba(30, 53, 84, 0.7);
  --about-section-gap: 88px;
  padding-bottom: 104px;
}

.page-about .breadcrumbs {
  margin: 26px 0 0;
  font-size: 13px;
}

.page-about .breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--dim);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding: 40px 0 0;
}

.page-about .hero-copy .eyebrow {
  margin: 0 0 14px;
}

.page-about .hero-copy h1 {
  margin: 0 0 18px;
  font-size: clamp(28px, 6.4vw, 44px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .hero-lead {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 60ch;
}

.page-about .hero-facts {
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  border-top: 1px solid var(--hairline);
  padding-top: 22px;
}

.page-about .hero-facts .fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .hero-facts dt {
  order: 2;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.page-about .hero-facts dd {
  order: 1;
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--white);
}

.page-about .hero-facts .num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--gold);
}

.page-about .hero-facts .unit {
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-media {
  margin: 0;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: linear-gradient(160deg, rgba(30, 139, 255, 0.12), rgba(11, 23, 41, 0) 62%), var(--deep);
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .hero-media figcaption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  color: var(--muted);
  border-top: 1px solid var(--hairline);
}

/* ---------- 主体：左轨 + 内容 ---------- */

.page-about .about-body {
  margin-top: 64px;
}

.page-about .about-rail {
  margin-bottom: 34px;
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 6px;
}

.page-about .rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--glass-line);
  background: var(--glass);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease, background 180ms ease;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--white);
  border-color: rgba(47, 139, 255, 0.7);
  background: rgba(47, 139, 255, 0.14);
}

.page-about .rail-no {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--gold);
}

/* ---------- 章节 ---------- */

.page-about .about-section {
  padding-top: var(--about-section-gap);
  scroll-margin-top: calc(var(--header-h) + 22px);
}

.page-about .about-section:first-child {
  padding-top: 0;
}

.page-about .about-section .section-head h2 {
  margin: 10px 0 0;
  font-size: clamp(21px, 3.6vw, 27px);
  line-height: 1.32;
  letter-spacing: -0.005em;
  color: var(--white);
}

.page-about .section-lead {
  margin: 12px 0 0;
  max-width: 66ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 三块职责卡 ---------- */

.page-about .duty-grid {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.page-about .duty {
  position: relative;
  padding: 22px 22px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-line);
  background:
    linear-gradient(180deg, rgba(47, 139, 255, 0.07), rgba(11, 23, 41, 0) 58%),
    var(--glass);
  transition: border-color 220ms ease, transform 220ms ease;
}

.page-about .duty::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(47, 139, 255, 0));
  opacity: 0.5;
}

.page-about .duty-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.page-about .duty-head h3 {
  margin: 0;
  font-size: 18px;
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about .duty-body {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .duty-extra {
  margin: 0;
  padding-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--dim);
  font-size: 13.5px;
  line-height: 1.72;
  transition: max-height 340ms ease, opacity 260ms ease, padding-top 340ms ease;
}

/* ---------- 流程 ---------- */

.page-about .pipeline-figure {
  margin: 26px 0 0;
}

.page-about .pipeline-figure .figure-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: var(--deep);
}

.page-about .pipeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .pipeline-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--dim);
}

.page-about .pipeline-list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  counter-reset: pipeline;
}

.page-about .pipeline-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "no title"
    "no desc"
    "no role";
  gap: 2px 16px;
  padding: 0 0 26px;
}

.page-about .pipeline-step::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 40px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--grid), rgba(30, 53, 84, 0.15));
}

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

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

.page-about .pipeline-step .step-no {
  grid-area: no;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(47, 139, 255, 0.55);
  background: rgba(47, 139, 255, 0.12);
  color: var(--white);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
}

.page-about .pipeline-step h3 {
  grid-area: title;
  margin: 7px 0 0;
  font-size: 16px;
  color: var(--white);
}

.page-about .pipeline-step p {
  grid-area: desc;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .pipeline-step .step-role {
  grid-area: role;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 服务半径 ---------- */

.page-about .reach-grid {
  margin-top: 26px;
  display: grid;
  gap: 24px;
}

.page-about .reach-copy p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .reach-copy p:last-of-type {
  margin-bottom: 0;
}

.page-about .reach-links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .reach-figure {
  margin: 0;
}

.page-about .reach-figure .figure-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-line);
  background: var(--deep);
}

.page-about .reach-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 11 / 7;
  object-fit: cover;
  opacity: 0.88;
}

.page-about .reach-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--dim);
}

/* ---------- 时间线 ---------- */

.page-about .timeline-track {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .tl-node {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 18px;
  padding-bottom: 26px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 18px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--grid), rgba(30, 53, 84, 0.18));
}

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

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

.page-about .tl-dot {
  position: relative;
  z-index: 1;
  width: 14px;
  height: 14px;
  margin: 5px 0 0 6px;
  border-radius: 50%;
  background: var(--ink);
  border: 3px solid var(--blue);
  box-shadow: 0 0 0 4px rgba(47, 139, 255, 0.1);
}

.page-about .tl-node:nth-child(3) .tl-dot,
.page-about .tl-node:nth-child(4) .tl-dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 180, 65, 0.1);
}

.page-about .tl-node:nth-child(5) .tl-dot {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(39, 192, 138, 0.1);
}

.page-about .tl-card {
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  padding: 18px 20px 20px;
  transition: border-color 220ms ease, transform 220ms ease;
}

.page-about .tl-card h3 {
  margin: 12px 0 0;
  font-size: 17px;
  color: var(--white);
}

.page-about .tl-card p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.72;
}

/* ---------- 团队与规范 ---------- */

.page-about .team-grid {
  margin-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .stat-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 18px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-line);
  background:
    linear-gradient(200deg, rgba(242, 180, 65, 0.09), rgba(11, 23, 41, 0) 62%),
    var(--glass);
}

.page-about .stat-num {
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--white);
}

.page-about .stat-label {
  font-size: 13.5px;
  color: var(--white);
  opacity: 0.86;
}

.page-about .stat-note {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dim);
}

.page-about .team-notes h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  color: var(--white);
}

.page-about .team-notes h3:not(:first-child) {
  margin-top: 24px;
}

.page-about .team-notes p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.78;
}

.page-about .team-links {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */

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

  .page-about .duty-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .duty:hover,
  .page-about .duty:focus-within {
    border-color: rgba(47, 139, 255, 0.6);
    transform: translateY(-2px);
  }

  .page-about .duty:hover .duty-extra,
  .page-about .duty:focus-within .duty-extra {
    max-height: 220px;
    opacity: 1;
    padding-top: 12px;
  }

  .page-about .pipeline-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .pipeline-step {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "no"
      "title"
      "desc"
      "role";
    gap: 0;
    padding: 0 0 0;
  }

  .page-about .pipeline-step::before {
    left: 46px;
    top: 20px;
    bottom: auto;
    width: auto;
    right: -18px;
    height: 2px;
    background: linear-gradient(90deg, var(--grid), rgba(30, 53, 84, 0.18));
  }

  .page-about .pipeline-step h3 {
    margin-top: 14px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 48px;
    align-items: start;
    padding-top: 52px;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-column-gap);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    margin-bottom: 0;
    padding-right: 20px;
    border-right: 1px solid var(--hairline);
  }

  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
    padding-bottom: 0;
  }

  .page-about .rail-list a {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--radius-sm);
    border-color: transparent;
    background: transparent;
    padding: 10px 12px;
  }

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

  .page-about .timeline-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0 18px;
  }

  .page-about .tl-node {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding-bottom: 0;
  }

  .page-about .tl-node::before {
    left: 20px;
    top: 12px;
    bottom: auto;
    right: -18px;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--grid), rgba(30, 53, 84, 0.18));
  }

  .page-about .tl-node:last-child::before {
    display: block;
    background: linear-gradient(90deg, var(--grid), rgba(30, 53, 84, 0) 90%);
  }

  .page-about .tl-dot {
    margin: 0 0 0 14px;
  }

  .page-about .tl-card {
    margin-top: 18px;
    height: calc(100% - 18px);
  }

  .page-about .tl-card:hover {
    border-color: rgba(242, 180, 65, 0.55);
    transform: translateY(-2px);
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: 60px;
  }
}
<<<END>>>