.page-about {
  --about-rail: 100%;
  --about-gap: 26px;
  --about-tick: 15px;
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: 36px;
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: 26px;
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--paper-45);
}
.page-about .breadcrumbs a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  border-bottom-color: var(--neon);
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding-block: 26px 44px;
}
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--neon);
}
.page-about .hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8.4vw, 64px);
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .hero-copy .lede {
  margin: 18px 0 0;
  max-width: 40ch;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.9;
  color: var(--paper-70);
}
.page-about .hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 34px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 92px;
}
.page-about .hero-fact__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 23px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--neon);
}
.page-about .hero-fact__label {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--paper-45);
}
.page-about .hero-visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-850);
  overflow: hidden;
}
.page-about .hero-visual::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, rgba(6, 26, 20, 0) 0%, rgba(6, 26, 20, .82) 100%);
  pointer-events: none;
}
.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 年鉴骨架 ---------- */
.page-about .about-ledger {
  display: grid;
  gap: var(--about-gap);
  padding-bottom: 56px;
}
.page-about .ledger-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.page-about .ledger-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--paper-45);
}
.page-about .ledger-list {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .ledger-list::-webkit-scrollbar {
  display: none;
}
.page-about .ledger-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--paper-45);
  text-decoration: none;
  white-space: nowrap;
  transition: color .3s var(--ease);
}
.page-about .ledger-item::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--neon-dim);
  background: transparent;
  transition: background .3s var(--ease);
}
.page-about .ledger-item:hover,
.page-about .ledger-item:focus-visible {
  color: var(--neon);
}
.page-about .ledger-item:hover::before,
.page-about .ledger-item:focus-visible::before {
  background: var(--neon);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.page-about .chapter {
  position: relative;
  padding: 38px 0 34px;
  border-top: 1px solid var(--line);
}
.page-about .chapter:first-child {
  padding-top: 0;
  border-top: 0;
}
.page-about .chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}
.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--neon);
}
.page-about .chapter-title {
  margin: 0;
  flex: 1 1 220px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 5.6vw, 36px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .prose {
  max-width: 42ch;
  margin: 0 0 22px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.95;
  color: var(--paper-70);
}
.page-about .chapter-link-row {
  margin: 22px 0 0;
}
.page-about .chapter-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--neon-dim);
  padding-bottom: 3px;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}
.page-about .chapter-link::after {
  content: "→";
  font-family: var(--font-body);
  transition: transform .3s var(--ease);
}
.page-about .chapter-link:hover,
.page-about .chapter-link:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}
.page-about .chapter-link:hover::after,
.page-about .chapter-link:focus-visible::after {
  transform: translateX(4px);
}

/* ---------- 时间轴 ---------- */
.page-about .trail-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .trail-item {
  position: relative;
  padding: 0 0 30px 34px;
}
.page-about .trail-item:last-child {
  padding-bottom: 0;
}
.page-about .trail-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: var(--about-tick);
  height: var(--about-tick);
  border-radius: 50%;
  border: 1px solid var(--neon-dim);
  background: var(--ink-900);
}
.page-about .trail-item::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.page-about .trail-item:last-child::after {
  display: none;
}
.page-about .trail-year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: .04em;
  color: var(--neon);
}
.page-about .trail-body h3 {
  margin: 6px 0 7px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .trail-body p {
  margin: 0;
  max-width: 40ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper-70);
}

/* ---------- 四类栏目 ---------- */
.page-about .pivot-grid {
  display: grid;
  gap: 14px;
}
.page-about .pivot-card {
  padding: 20px 18px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 2px solid var(--neon);
}
.page-about .pivot-card__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--neon);
}
.page-about .pivot-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.34;
  color: var(--paper);
}
.page-about .pivot-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-70);
}

/* ---------- 流程 ---------- */
.page-about .flow-figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  background: var(--ink-850);
  overflow: hidden;
}
.page-about .flow-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}
.page-about .flow-steps {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.page-about .flow-step {
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  background: rgba(11, 42, 32, .55);
}
.page-about .flow-step__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--pulse);
}
.page-about .flow-step h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--paper);
}
.page-about .flow-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-70);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
}
.page-about .team-panel {
  padding: 24px 20px 26px;
  color: var(--paper);
}
.page-about .team-panel--data {
  background: var(--ink-800);
  border: 1px solid var(--line);
}
.page-about .team-panel--edit {
  background: var(--indigo);
}
.page-about .team-panel--tech {
  background: var(--wine);
}
.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .team-panel h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--paper);
}
.page-about .team-panel p {
  margin: 0;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.85;
  color: var(--paper-70);
}

/* ---------- 服务区域 ---------- */
.page-about .region-block {
  display: grid;
  gap: 22px;
}
.page-about .region-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-850);
  overflow: hidden;
}
.page-about .region-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.page-about .region-copy p {
  margin: 0 0 14px;
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.95;
  color: var(--paper-70);
}
.page-about .region-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}
.page-about .region-tags li {
  padding: 5px 11px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--neon);
}
.page-about .region-note {
  padding-left: 14px;
  border-left: 2px solid var(--pulse);
  color: var(--paper-70) !important;
}

/* ---------- 长期方向 ---------- */
.page-about .roadmap {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}
.page-about .roadmap-item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.page-about .roadmap-item:first-child {
  border-top: 0;
  padding-top: 4px;
}
.page-about .roadmap-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--neon);
}
.page-about .roadmap-item p {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--paper-70);
}

/* ---------- 中屏 ---------- */
@media (min-width: 700px) {
  .page-about .pivot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .region-block {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .roadmap-item {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }
}

/* ---------- 宽屏：左侧年鉴轨道 ---------- */
@media (min-width: 960px) {
  .page-about {
    --about-rail: 148px;
    --about-gap: 44px;
  }
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 40px;
    padding-block: 34px 56px;
  }
  .page-about .about-ledger {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }
  .page-about .ledger-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    border: 1px solid var(--line);
    background: var(--ink-850);
    padding: 20px 16px 22px;
  }
  .page-about .ledger-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about .ledger-item {
    width: 100%;
    padding: 7px 0;
  }
  .page-about .chapter {
    padding: 48px 0 42px;
  }
  .page-about .chapter-title {
    flex: 0 1 auto;
  }
  .page-about .flow-step {
    padding: 20px 18px 24px;
  }
  .page-about .team-panel {
    padding: 28px 22px 30px;
  }
}

@media (min-width: 1200px) {
  .page-about .chapter-head {
    gap: 18px;
  }
  .page-about .pivot-card {
    padding: 24px 22px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-link::after,
  .page-about .ledger-item,
  .page-about .ledger-item::before {
    transition: none;
  }
}