.page-about {
  --about-rail: 76px;
  --about-ink-soft: rgba(7, 19, 31, 0.74);
  --about-line-dark: rgba(7, 19, 31, 0.16);
  position: relative;
  isolation: isolate;
  background-color: var(--c-abyss);
  color: var(--c-light);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(var(--line-soft) 1px, transparent 1px);
  background-size: 100% 104px;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-crumb-row {
  padding-top: clamp(92px, 13vw, 132px);
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-steel);
}

.page-about .crumbs a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-lead {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
  padding-top: clamp(22px, 4vw, 38px);
  padding-bottom: clamp(40px, 7vw, 76px);
}

.page-about .about-lead__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-lead__kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background-color: var(--c-cyan);
}

.page-about .about-lead h1 {
  margin: 16px 0 0;
  max-width: 15em;
  font-size: clamp(2rem, 5.4vw, 4.1rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-light);
}

.page-about .about-lead__deck {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12.5px;
  color: var(--c-steel);
}

.page-about .about-facts span {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-light);
}

.page-about .about-facts em {
  font-style: normal;
}

/* 资料抽屉 */

.page-about .about-drawer {
  background-color: var(--c-navy);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 26px) clamp(18px, 3vw, 24px);
}

.page-about .about-drawer__title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}

.page-about .about-drawer__hint {
  margin: 8px 0 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-steel);
}

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

.page-about .about-drawer__link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  column-gap: 12px;
  row-gap: 3px;
  padding: 14px 6px;
  border-top: 1px solid var(--line-soft);
  text-decoration: none;
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-drawer__link:hover,
.page-about .about-drawer__link:focus-visible {
  background-color: rgba(47, 212, 196, 0.07);
}

.page-about .about-drawer__idx {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-orange);
}

.page-about .about-drawer__label {
  grid-column: 2;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--c-light);
}

.page-about .about-drawer__desc {
  grid-column: 2;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-steel);
}

.page-about .about-drawer__link:hover .about-drawer__desc,
.page-about .about-drawer__link:focus-visible .about-drawer__desc {
  color: var(--c-mist);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  display: grid;
  gap: 16px;
  padding-block: clamp(36px, 6vw, 64px);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 100px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-chapter__num {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--c-orange);
}

.page-about .about-chapter__tick {
  flex: 1;
  height: 1px;
  min-width: 44px;
  background-color: var(--line-strong);
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__body > h2 {
  margin: 0 0 18px;
  font-size: clamp(1.4rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--c-light);
}

.page-about .about-prose {
  max-width: 36em;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-mist);
}

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

.page-about .about-prose--after {
  margin-top: 26px;
}

.page-about .about-tail {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-steel);
}

.page-about .about-tail a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 212, 196, 0.42);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--c-navy);
}

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

.page-about .about-figure .figure__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--c-steel);
}

/* ---------- 批注 ---------- */

.page-about .about-note {
  max-width: 34em;
  margin-top: 24px;
  padding: 14px 16px;
  background-color: var(--c-sand);
  border-left: 3px solid var(--c-amber);
  color: var(--c-ink);
}

.page-about .about-note summary {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-about .about-note summary::-webkit-details-marker {
  display: none;
}

.page-about .about-note summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .about-note[open] summary::before {
  content: "–";
}

.page-about .about-note p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 修订规则 ---------- */

.page-about .about-rules {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-rules li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rules .mono {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .about-rules h3 {
  grid-column: 2;
  grid-row: 1;
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-light);
}

.page-about .about-rules p {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  border: 1px solid var(--line);
  background-color: var(--line-soft);
}

.page-about .about-team__lane {
  padding: 22px 20px;
  background-color: var(--c-navy);
}

.page-about .about-team__count {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .about-team__lane h3 {
  margin: 12px 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-light);
}

.page-about .about-team__lane p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 版本刻度（浅砂分区） ---------- */

.page-about .about-milestones {
  margin-top: clamp(20px, 4vw, 40px);
  padding-block: clamp(32px, 5vw, 56px);
  background-color: var(--c-sand);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(7, 19, 31, 0.045) 0 1px,
    transparent 1px 40px
  );
  color: var(--c-ink);
}

.page-about .about-milestones .about-chapter {
  border-top-color: var(--about-line-dark);
  padding-block: 0;
}

.page-about .about-milestones .about-chapter__tick {
  background-color: var(--about-line-dark);
}

.page-about .about-milestones .about-chapter__body > h2 {
  color: var(--c-ink);
}

.page-about .about-milestones__lead {
  margin: 0 0 8px;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background-image: linear-gradient(to bottom, var(--c-orange), rgba(7, 19, 31, 0.22));
}

.page-about .milestone {
  position: relative;
  padding: 0 0 26px 30px;
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--c-orange);
  border-radius: 50%;
  background-color: var(--c-sand);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .milestone:hover::before {
  background-color: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .milestone__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: #C24A16;
}

.page-about .milestone h3 {
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .milestone p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-milestones .about-figure {
  margin-top: 30px;
}

.page-about .about-milestones .figure__media {
  border-color: var(--about-line-dark);
  background-color: rgba(7, 19, 31, 0.06);
}

.page-about .about-milestones .figure__caption {
  color: var(--about-ink-soft);
}

/* ---------- 访问分布 ---------- */

.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  border: 1px solid var(--line-soft);
  background-color: var(--line-soft);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background-color: var(--c-abyss);
}

.page-about .about-stats__value {
  order: 1;
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--c-light);
}

.page-about .about-stats__label {
  order: 2;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--c-steel);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-block: clamp(36px, 6vw, 72px) clamp(48px, 8vw, 88px);
}

.page-about .about-cta__panel {
  display: grid;
  gap: 24px;
  padding: clamp(22px, 4vw, 38px);
  background-color: var(--c-navy);
  border: 1px solid var(--line-strong);
}

.page-about .about-cta__panel h2 {
  margin: 0;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1.38;
  color: var(--c-light);
}

.page-about .about-cta__panel p {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.page-about .about-cta__actions .link-quiet {
  font-size: 14px;
  color: var(--c-mist);
  transition: color var(--dur) var(--ease);
}

.page-about .about-cta__actions .link-quiet:hover,
.page-about .about-cta__actions .link-quiet:focus-visible {
  color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-lead {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(20px, 4vw, 48px);
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 100px;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .page-about .about-chapter__tick {
    flex: none;
    width: 1px;
    min-width: 0;
    height: clamp(56px, 10vw, 132px);
  }

  .page-about .about-figure--push {
    margin-left: clamp(0px, 5vw, 64px);
  }

  .page-about .about-figure--banner {
    margin-right: clamp(0px, 3vw, 40px);
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>