.page-about {
  --about-cardgap: 12px;
  --about-rail-top: calc(var(--frame-top) + 24px);
  padding-bottom: 80px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 20px;
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumbs li {
  color: var(--tide);
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin: 0 8px;
  color: rgba(122, 152, 168, .7);
}
.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
  transition: color .18s ease, border-color .18s ease;
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--ice);
  border-color: var(--line-strong);
}

/* ---------- 首屏 ---------- */
.page-about .hero-grid {
  display: grid;
  gap: 26px;
  padding-top: 26px;
  align-items: start;
}
.page-about .hero-kicker {
  display: inline-block;
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--yellow);
  background: rgba(255, 210, 63, .08);
  border: 1px solid rgba(255, 210, 63, .3);
  border-radius: var(--radius);
  padding: 5px 10px;
}
.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 52px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 15ch;
}
.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 84px;
  height: 3px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--ice), var(--orange) 60%, transparent);
}
.page-about .about-hero .lead {
  margin: 0 0 22px;
  max-width: 38ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .hero-tags li {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ice);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 5px 12px;
  background: rgba(111, 233, 224, .06);
}
.page-about .hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
  box-shadow: 0 24px 48px -32px rgba(0, 0, 0, .95);
}
.page-about .hero-figure::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(4, 18, 31, .1) 0%, rgba(4, 18, 31, .72) 100%);
}
.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .hero-figure .media-caption {
  position: absolute;
  z-index: 3;
  left: 14px;
  right: 14px;
  bottom: 12px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 移动端章节速览 ---------- */
.page-about .about-toc {
  margin-top: 34px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}
.page-about .about-toc ul {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-toc ul::-webkit-scrollbar {
  display: none;
}
.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
}
.page-about .about-toc a[aria-current="true"] {
  color: var(--ink);
  background: var(--ice);
  border-color: var(--ice);
}

/* ---------- 主体分屏 ---------- */
.page-about .about-story {
  margin-top: 46px;
}
.page-about .story-grid {
  display: grid;
  gap: 34px;
  align-items: start;
}
.page-about .story-main {
  display: flex;
  flex-direction: column;
  gap: 56px;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  min-width: 0;
  scroll-margin-top: calc(var(--frame-top) + 20px);
}
.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.page-about .chapter-num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--yellow);
  flex: 0 0 auto;
}
.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 5.4vw, 30px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .chapter-body p {
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 40ch;
}
.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}
.page-about .chapter-body strong {
  color: var(--paper);
  font-weight: 700;
  border-bottom: 2px solid rgba(111, 233, 224, .45);
  padding-bottom: 1px;
}
.page-about .chapter-body a,
.page-about .chapter-link a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}
.page-about .chapter-body a:hover,
.page-about .chapter-link a:hover {
  border-bottom-color: var(--orange);
  color: var(--yellow);
}
.page-about .chapter-link {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--tide);
  max-width: 40ch;
}
.page-about .gloss {
  border-bottom: 1px dashed rgba(111, 233, 224, .6);
  cursor: help;
  color: var(--paper);
}
.page-about .chapter-figure {
  position: relative;
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}
.page-about .chapter-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .chapter-figure .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 14px 10px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mist);
  background: linear-gradient(180deg, rgba(4, 18, 31, 0) 0%, rgba(4, 18, 31, .92) 100%);
}

/* ---------- 服务版图数据卡 ---------- */
.page-about .reach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-cardgap);
  margin: 22px 0 0;
}
.page-about .reach-card {
  position: relative;
  padding: 16px 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--mid) 0%, var(--deep) 62%, var(--ink) 100%);
  overflow: hidden;
}
.page-about .reach-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--ice), transparent 78%);
}
.page-about .reach-card::after {
  content: "";
  position: absolute;
  right: -26px;
  bottom: -26px;
  width: 74px;
  height: 74px;
  border: 1px solid rgba(111, 233, 224, .18);
  border-radius: 50%;
}
.page-about .reach-value {
  display: block;
  font-size: clamp(26px, 7vw, 38px);
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1;
  color: var(--yellow);
}
.page-about .reach-unit {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ice);
}
.page-about .reach-note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--tide);
}

/* ---------- 团队卡（纸张叠层） ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--about-cardgap);
  margin: 22px 0 0;
}
.page-about .team-card {
  position: relative;
  padding: 14px 13px 16px;
  background: var(--chart);
  color: var(--ink);
  border: 1px solid rgba(4, 18, 31, .14);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 rgba(111, 233, 224, .22);
}
.page-about .team-card::after {
  content: "";
  position: absolute;
  top: 8px;
  right: 8px;
  width: 14px;
  height: 14px;
  border-top: 2px solid var(--orange);
  border-right: 2px solid var(--orange);
}
.page-about .team-num {
  display: block;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #0A2A43;
  line-height: 1;
}
.page-about .team-role {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: #10405E;
}
.page-about .team-card p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: #2C4A5C;
}

/* ---------- 里程碑轨道 ---------- */
.page-about .milestone-track {
  display: flex;
  gap: 0;
  margin: 26px 0 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.page-about .ms-node {
  position: relative;
  flex: 0 0 74%;
  min-width: 0;
  padding: 34px 18px 0 0;
  scroll-snap-align: start;
}
.page-about .ms-node::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line-strong);
}
.page-about .ms-node::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ice);
  box-shadow: 0 0 0 4px rgba(111, 233, 224, .16);
}
.page-about .ms-node:last-child::after {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, .2);
}
.page-about .ms-ver {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--yellow);
  border-radius: 2px;
  padding: 3px 8px;
}
.page-about .ms-node:last-child .ms-ver {
  background: var(--orange);
  color: var(--paper);
}
.page-about .ms-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 结尾行动 ---------- */
.page-about .about-next {
  position: relative;
  margin-top: 26px;
  padding: 26px 20px 28px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background:
    linear-gradient(150deg, rgba(16, 64, 94, .9) 0%, rgba(4, 18, 31, .96) 70%),
    var(--ink);
  overflow: hidden;
}
.page-about .about-next::before {
  content: "";
  position: absolute;
  top: -46px;
  right: -46px;
  width: 150px;
  height: 150px;
  border: 1px solid rgba(255, 90, 31, .34);
  border-radius: 50%;
}
.page-about .next-kicker {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
}
.page-about .next-copy h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 5vw, 26px);
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .next-copy p {
  margin: 0;
  max-width: 38ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 右侧航线刻度 ---------- */
.page-about .about-rail {
  display: none;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 720px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ms-node {
    flex: 1 1 0;
    padding-right: 20px;
  }
  .page-about .about-next {
    padding: 32px 30px 34px;
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: 42px;
    align-items: end;
    padding-top: 40px;
  }
  .page-about .about-toc {
    display: none;
  }
  .page-about .about-story {
    margin-top: 62px;
  }
  .page-about .story-grid {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
  }
  .page-about .story-main {
    gap: 68px;
  }
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: var(--about-rail-top);
  }
  .page-about .about-rail .rail-inner {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px 20px 24px;
    background: linear-gradient(180deg, rgba(16, 64, 94, .5) 0%, rgba(4, 18, 31, .9) 100%);
  }
  .page-about .rail-kicker {
    margin: 0 0 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .18em;
    color: var(--yellow);
  }
  .page-about .rail-lead {
    margin: 0 0 18px;
    font-size: 12px;
    line-height: 1.7;
    color: var(--tide);
  }
  .page-about .rail-list {
    position: relative;
    margin: 0;
    padding: 0 0 0 20px;
    list-style: none;
  }
  .page-about .rail-list::before {
    content: "";
    position: absolute;
    left: 5px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: var(--line);
  }
  .page-about .rail-link {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0;
    font-size: 13px;
    color: var(--tide);
    text-decoration: none;
    transition: color .18s ease;
  }
  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 16px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--mid);
    border: 1px solid var(--line-strong);
    transition: background .18s ease, box-shadow .18s ease, border-color .18s ease;
  }
  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    color: var(--paper);
  }
  .page-about .rail-link[aria-current="true"] {
    color: var(--paper);
    font-weight: 700;
  }
  .page-about .rail-link[aria-current="true"]::before {
    background: var(--ice);
    border-color: var(--ice);
    box-shadow: 0 0 0 4px rgba(111, 233, 224, .18);
  }
  .page-about .rail-num {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    color: var(--yellow);
    flex: 0 0 auto;
  }
  .page-about .rail-foot {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
  }
  .page-about .rail-foot p {
    margin: 0 0 8px;
    font-size: 12px;
    line-height: 1.72;
    color: var(--tide);
  }
  .page-about .rail-foot p.mono {
    color: var(--ice);
    letter-spacing: .1em;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero .lead {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .rail-link::before,
  .page-about .breadcrumbs a {
    transition: none;
  }
}
<<<END>>>