.page-about {
  --about-rail: 176px;
  --about-num: clamp(30px, 6.4vw, 58px);
  display: block;
}

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

/* ============ 首屏 ============ */
.page-about .story-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 40px) 0 48px;
  background:
    radial-gradient(85% 60% at 88% 2%, rgba(76, 255, 224, .12), transparent 62%),
    linear-gradient(170deg, var(--deep) 0%, var(--ink) 60%, var(--ink-2) 100%);
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(135deg, rgba(255, 91, 56, .10), transparent 46%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}

.page-about .story-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(29, 59, 50, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 59, 50, .55) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .85), transparent 78%);
  pointer-events: none;
}

.page-about .story-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  margin-bottom: 26px;
}

.page-about .story-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .story-hero__lead .eyebrow {
  margin: 0;
}

.page-about .story-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(34px, 8vw, 74px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .story-hero__lead .lede {
  margin: 18px 0 0;
  max-width: 58ch;
  color: var(--mist);
}

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

.page-about .story-hero__aside {
  position: relative;
  padding: 22px;
  border: 1px solid rgba(76, 255, 224, .28);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .story-hero__aside-label {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--muted);
}

.page-about .story-hero__aside-year {
  margin: 0;
  font-size: clamp(46px, 12vw, 62px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .story-hero__aside-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .story-hero__aside-rot {
  display: none;
}

/* ============ 主体骨架 ============ */
.page-about .story-shell {
  padding-top: 4px;
  padding-bottom: 56px;
}

.page-about .story-rail {
  margin: 22px 0 6px;
}

.page-about .story-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .story-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  white-space: nowrap;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .story-rail__link .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .story-rail__link:hover,
.page-about .story-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .story-rail__link.is-current {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .story-rail__link.is-current .mono {
  color: var(--ink);
}

/* ============ 章节 ============ */
.page-about .chapter {
  padding: 36px 0 10px;
  border-top: 1px solid var(--line);
}

.page-about .chapter:first-child {
  padding-top: 8px;
  border-top: 0;
}

.page-about .chapter__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--about-num);
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--line);
  transition: color .28s var(--ease);
}

.page-about .chapter:hover .chapter__num,
.page-about .chapter:focus-within .chapter__num {
  color: var(--cyan);
}

.page-about .chapter__kicker {
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(23px, 4.8vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .chapter__body > p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .chapter__body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .chapter__body--split {
  display: grid;
  gap: 22px;
}

.page-about .link-more {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(76, 255, 224, .45);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .link-more:hover,
.page-about .link-more:focus-visible {
  color: var(--mist);
  border-color: var(--mist);
}

/* ============ 数据流程 ============ */
.page-about .flow {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .flow__item {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .flow__item[open] {
  border-left-color: var(--cyan);
  background: linear-gradient(120deg, rgba(18, 59, 50, .55), var(--ink-2));
}

.page-about .flow__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow__sum:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .flow__idx {
  font-size: 13px;
  color: var(--cyan);
}

.page-about .flow__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .flow__meta {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .flow__body {
  padding: 0 16px 16px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 团队 ============ */
.page-about .team {
  display: grid;
  gap: 12px;
  margin: 20px 0 18px;
}

.page-about .team__card {
  padding: 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .team__card:hover {
  border-top-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .team__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .muted {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 版本历程 ============ */
.page-about .story-axis {
  display: block;
  width: 100%;
  height: auto;
  margin: 4px 0 18px;
}

.page-about .story-axis .axis-line {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .story-axis .axis-tick {
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .story-axis .axis-tick--end {
  stroke: var(--alert);
  stroke-width: 2;
}

.page-about .story-axis .axis-node {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 2;
}

.page-about .story-axis .axis-node--end {
  fill: var(--alert);
  stroke: var(--alert);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 70%, transparent);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 24px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1.5px solid var(--cyan);
}

.page-about .timeline__item:last-child::before {
  background: var(--alert);
  border-color: var(--alert);
}

.page-about .timeline__year {
  margin: 0 0 4px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .timeline__item p:last-child {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 覆盖范围 ============ */
.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 22px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cover-stats__cell {
  padding: 18px 16px;
  background: var(--ink-2);
}

.page-about .cover-stats__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--paper);
}

.page-about .cover-stats__num span {
  color: var(--cyan);
  font-size: .6em;
  vertical-align: super;
}

.page-about .cover-stats__label {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ============ 图片容器 ============ */
.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

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

.page-about .media-caption {
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  background: rgba(10, 29, 23, .9);
  border-top: 1px solid var(--line);
}

.page-about .chapter__figure img {
  aspect-ratio: 4 / 3;
}

.page-about .milestone-band {
  margin: 18px 0 10px;
}

.page-about .milestone-band img {
  aspect-ratio: 16 / 7;
  opacity: .62;
}

.page-about .turf-band {
  margin: 6px 0 4px;
}

.page-about .turf-band img {
  aspect-ratio: 16 / 8;
  opacity: .7;
}

/* ============ 结尾行动区 ============ */
.page-about .story-cta {
  margin-top: 36px;
}

.page-about .story-cta__inner {
  position: relative;
  overflow: hidden;
  padding: 28px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--ink-2), var(--deep));
}

.page-about .story-cta__inner::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 91, 56, .22), transparent 70%);
  pointer-events: none;
}

.page-about .story-cta__inner > * {
  position: relative;
  z-index: 1;
}

.page-about .story-cta__inner .eyebrow {
  margin: 0 0 10px;
}

.page-about .story-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 5vw, 36px);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .story-cta p {
  margin: 12px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .story-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

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

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

  .page-about .story-cta__inner {
    padding: 36px 34px;
  }
}

@media (min-width: 860px) {
  .page-about .chapter__body--split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .story-hero__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
    gap: 36px;
  }

  .page-about .chapter__head {
    gap: 22px;
  }

  .page-about .story-shell {
    padding-bottom: 80px;
  }
}

@media (min-width: 1000px) {
  .page-about .story-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .story-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    margin: 8px 0 0;
  }

  .page-about .story-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
  }

  .page-about .story-rail__link {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    padding: 10px 0 10px 14px;
    font-size: 13px;
  }

  .page-about .story-rail__link.is-current {
    background: transparent;
    color: var(--paper);
    border-left: 2px solid var(--cyan);
  }

  .page-about .story-rail__link.is-current .mono {
    color: var(--cyan);
  }

  .page-about .story-hero {
    padding: calc(var(--header-h) + 56px) 0 72px;
  }

  .page-about .story-hero__aside {
    padding: 26px 44px 30px 26px;
  }

  .page-about .story-hero__aside-rot {
    display: block;
    position: absolute;
    top: 24px;
    right: 12px;
    writing-mode: vertical-rl;
    font-size: 10px;
    letter-spacing: .34em;
    color: rgba(140, 168, 158, .5);
    pointer-events: none;
  }

  .page-about .chapter {
    padding: 52px 0 14px;
  }

  .page-about .chapter__body > p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team__card,
  .page-about .chapter__num,
  .page-about .story-rail__link {
    transition: none;
  }

  .page-about .team__card:hover {
    transform: none;
  }
}