.page-about {
  --about-rail: 200px;
  display: block;
  background:
    radial-gradient(900px 620px at 88% -8%, rgba(25, 224, 210, 0.13), transparent 70%),
    radial-gradient(760px 520px at 4% 24%, rgba(255, 107, 74, 0.09), transparent 66%),
    var(--ink);
  color: var(--snow);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: clamp(28px, 5vw, 48px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(104px, 13vw, 168px) 0 clamp(48px, 6vw, 76px);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  align-items: end;
}

.page-about .hero-copy .display {
  margin: 14px 0 0;
  letter-spacing: -0.01em;
}

.page-about .hero-copy .lede {
  margin-top: 22px;
  max-width: 62ch;
  color: var(--mist);
  font-size: clamp(16px, 1.6vw, 18px);
}

.page-about .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .hero-media {
  position: relative;
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(140deg, rgba(25, 224, 210, 0.16), transparent 46%),
    linear-gradient(320deg, rgba(255, 107, 74, 0.14), transparent 52%);
  pointer-events: none;
}

.page-about .media-frame img,
.page-about .hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .hero-stats {
  list-style: none;
  margin: clamp(38px, 5vw, 60px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 2px solid var(--line);
  border-left: 2px solid var(--line);
}

.page-about .hero-stats li {
  padding: 18px 16px 20px;
  border-right: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .stat-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .hero-stats li:nth-child(3) .stat-num,
.page-about .hero-stats li:nth-child(4) .stat-num {
  color: var(--snow);
}

.page-about .stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 档案布局 ---------- */
.page-about .archive-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .chapter-rail {
  border-top: 2px solid var(--line);
  padding-top: 14px;
}

.page-about .rail-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 2px solid var(--line);
  color: var(--snow);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  background: var(--ink-2);
  transition: border-color 0.22s ease, color 0.22s ease, background 0.22s ease;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--panel);
}

.page-about .rail-num {
  color: var(--coral);
  font-size: 11px;
}

.page-about .archive-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(36px, 6vw, 64px) 0;
  border-top: 2px solid var(--line);
}

.page-about .about-section > .heading {
  margin: 10px 0 0;
}

.page-about .about-section .lede {
  margin-top: 18px;
  max-width: 64ch;
  color: var(--mist);
}

.page-about .about-section .prose {
  margin-top: 20px;
  max-width: 68ch;
  color: var(--mist);
}

.page-about .about-section .prose p + p {
  margin-top: 16px;
}

.page-about .about-section--panel {
  background: var(--ink-2);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard-sm);
  padding: clamp(26px, 4vw, 44px);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-section--deep {
  background:
    linear-gradient(160deg, rgba(16, 42, 68, 0.92), rgba(11, 30, 51, 0.98));
  border: 2px solid var(--line);
  padding: clamp(26px, 4vw, 44px);
  margin: clamp(24px, 4vw, 40px) 0;
}

/* ---------- 起点 ---------- */
.page-about .origin-points {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .origin-points li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--ink-2);
  font-size: 15px;
  color: var(--snow);
}

.page-about .coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
  flex: 0 0 auto;
  padding-top: 2px;
}

/* ---------- 版本路线 ---------- */
.page-about .version-map {
  margin: 30px 0 0;
  border: 2px solid var(--line);
  background: var(--ink);
  overflow: hidden;
}

.page-about .version-map img {
  aspect-ratio: 16 / 7;
}

.page-about .media-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  margin: 0;
}

.page-about .timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 4px;
}

.page-about .tl-item {
  position: relative;
  padding: 18px 18px 20px 26px;
  border-left: 2px solid var(--line);
  transition: background 0.24s ease, border-color 0.24s ease;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 28px;
  width: 12px;
  height: 12px;
  background: var(--panel);
  border: 2px solid var(--line);
  transform: rotate(45deg);
  transition: border-color 0.24s ease, background 0.24s ease;
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  background: var(--panel);
  border-left-color: var(--cyan);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--panel);
  -webkit-text-stroke: 1.4px var(--line);
  text-stroke: 1.4px var(--line);
}

.page-about .tl-item--next .tl-year {
  -webkit-text-stroke: 1.4px var(--coral);
}

.page-about .tl-title {
  margin: 10px 0 0;
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--snow);
}

.page-about .tl-detail {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .rail-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 0;
}

/* ---------- 目录维护 ---------- */
.page-about .flow-figure {
  margin: 32px 0 0;
  border: 2px solid var(--line);
  background: var(--ink-2);
}

.page-about .flow-svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  padding: 18px 12px 8px;
  box-sizing: border-box;
}

.page-about .flow-num {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--cyan);
}

.page-about .flow-text {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  fill: var(--pale);
}

.page-about .maint-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .maint-card {
  border: 2px solid var(--line);
  border-top: 3px solid var(--coral);
  padding: 20px 18px;
  background: var(--ink-2);
}

.page-about .maint-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .maint-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  margin-top: 22px;
  align-items: start;
}

.page-about .coverage-copy .lede {
  margin-top: 0;
}

.page-about .coverage-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .coverage-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 2px solid var(--line);
  background: rgba(6, 18, 31, 0.6);
  font-size: 15px;
  line-height: 1.65;
  color: var(--snow);
}

.page-about .coverage-figure {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard-sm);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background: var(--ink);
}

.page-about .metric-band {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .metric-band li {
  background: var(--ink-2);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .metric-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .metric-text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  align-items: center;
  margin-top: 22px;
  padding: clamp(22px, 3.5vw, 34px);
  border: 2px solid var(--line);
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .team-copy .prose {
  margin-top: 0;
  color: var(--mist);
}

.page-about .team-copy .prose + .prose {
  margin-top: 14px;
}

.page-about .team-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .team-facts {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 2px solid var(--line);
}

.page-about .team-facts > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: baseline;
  padding: 14px 4px;
  border-bottom: 2px solid var(--line);
}

.page-about .team-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
  min-width: 78px;
}

.page-about .team-facts dd {
  margin: 0;
  font-size: 15px;
  color: var(--snow);
  word-break: break-word;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 52px);
  padding: clamp(26px, 4vw, 44px);
  border: 2px solid var(--line);
  background:
    linear-gradient(120deg, rgba(25, 224, 210, 0.14), transparent 52%),
    linear-gradient(300deg, rgba(255, 107, 74, 0.16), transparent 56%),
    var(--ink-2);
}

.page-about .about-cta .heading {
  margin: 0 0 22px;
}

.page-about .cta-links {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .cta-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 18px 20px;
  border: 2px solid var(--line);
  background: var(--ink);
  color: var(--snow);
  text-decoration: none;
  transition: border-color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .cta-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--coral);
  letter-spacing: 0.1em;
  padding-top: 4px;
}

.page-about .cta-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.3;
}

.page-about .cta-desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .page-about .maint-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .cta-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .metric-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-band {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-about .team-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-facts > div:nth-last-child(2) {
    border-bottom: 2px solid var(--line);
  }
}

@media (min-width: 1080px) {
  .page-about .archive-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(48px, 6vw, 88px);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-list li + li {
    margin-top: 6px;
  }

  .page-about .rail-link {
    display: flex;
    width: 100%;
    box-sizing: border-box;
    white-space: normal;
    border-width: 0 0 0 2px;
    background: transparent;
    padding: 8px 0 8px 12px;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .page-about .origin-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .tl-item {
    padding-left: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .tl-item,
  .page-about .tl-item::before,
  .page-about .cta-link {
    transition: none;
  }

  .page-about .cta-link:hover,
  .page-about .cta-link:focus-visible {
    transform: none;
  }
}
<<<END>>>