.page-about {
  --about-railw: 176px;
  --about-gap: 48px;
  --about-body-max: 760px;
  --about-text: 34em;
  background-color: var(--ink);
  color: var(--paper);
}

.page-about a {
  color: inherit;
}

.page-about .about-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 160, 61, 0.45);
  padding-bottom: 1px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--amber-light);
  border-bottom-color: var(--amber-light);
  outline: none;
}

.page-about .about-sec--paper .about-link {
  color: var(--green);
  border-bottom-color: rgba(12, 59, 46, 0.4);
}

.page-about .about-sec--paper .about-link:hover,
.page-about .about-sec--paper .about-link:focus-visible {
  color: var(--green-lift);
  border-bottom-color: var(--green-lift);
}

/* ---------- 顶部面包屑条 ---------- */

.page-about .about-top {
  background-color: var(--ink);
  padding: 20px 0 18px;
  border-bottom: 1px solid var(--rule);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 0 60px;
  border-bottom: 1px solid var(--rule);
  background-image: linear-gradient(158deg, var(--green) 0%, var(--green-deep) 58%, var(--ink) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -1px;
  width: 46%;
  height: 72%;
  background-image: linear-gradient(202deg, rgba(43, 210, 255, 0.18), rgba(43, 210, 255, 0) 68%);
  clip-path: polygon(14% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-anchor {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 16px;
  border-left: 3px solid var(--amber);
  align-self: start;
}

.page-about .about-anchor__code,
.page-about .about-anchor__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-anchor__code {
  color: var(--volt);
}

.page-about .about-anchor__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-anchor__meta {
  color: var(--grey);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 32px;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .about-hero__text {
  margin: 0 0 30px;
  max-width: var(--about-text);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.82);
}

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

.page-about .about-fig {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background-color: var(--ink-2);
}

.page-about .about-fig__n {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-fig__l {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

/* ---------- 章节通用骨架 ---------- */

.page-about .about-sec {
  padding: 52px 0 60px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-sec--dark {
  background-color: var(--ink);
  color: var(--paper);
}

.page-about .about-sec--green {
  background-color: var(--green-deep);
  color: var(--paper);
}

.page-about .about-sec--paper {
  background-color: var(--paper);
  color: var(--paper-ink);
  --rule: rgba(26, 23, 18, 0.16);
}

.page-about .about-sec--last {
  border-bottom: none;
}

.page-about .about-row {
  display: grid;
  gap: 18px;
}

.page-about .about-rail__inner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 36px;
  line-height: 0.88;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-rail__coord {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--grey);
}

.page-about .about-sec--paper .about-rail__num {
  color: var(--green);
}

.page-about .about-sec--paper .about-rail__coord {
  color: rgba(26, 23, 18, 0.5);
}

.page-about .about-body {
  max-width: var(--about-body-max);
}

.page-about .about-h {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 27px;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: inherit;
}

.page-about .about-h::before {
  content: "";
  display: block;
  width: 34px;
  height: 2px;
  margin-bottom: 14px;
  background-color: var(--amber);
}

.page-about .about-sec--paper .about-h::before {
  background-color: var(--green);
}

.page-about .about-p {
  max-width: var(--about-text);
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-sec--dark .about-p,
.page-about .about-sec--green .about-p {
  color: rgba(244, 241, 232, 0.8);
}

.page-about .about-sec--paper .about-p {
  color: rgba(26, 23, 18, 0.78);
}

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

/* ---------- 团队 / 合作 数据行 ---------- */

.page-about .about-team {
  margin: 26px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-team__n {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.005em;
}

.page-about .about-team__desc {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(244, 241, 232, 0.7);
}

.page-about .about-sec--paper .about-team__n {
  color: var(--green);
}

.page-about .about-sec--paper .about-team__desc {
  color: rgba(26, 23, 18, 0.68);
}

.page-about .about-team--green .about-team__n {
  color: var(--amber-light);
}

/* ---------- 复核步骤 ---------- */

.page-about .about-steps {
  margin: 26px 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-steps__n {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--green);
  padding-top: 4px;
}

.page-about .about-steps__txt strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.005em;
}

.page-about .about-steps__txt p {
  margin: 0;
  max-width: var(--about-text);
  font-size: 15px;
  line-height: 1.78;
  color: rgba(26, 23, 18, 0.72);
}

/* ---------- 坐标覆盖矩阵 ---------- */

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 26px;
  padding: 0;
  list-style: none;
  background-color: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 12px 13px;
  background-color: var(--ink-2);
  transition: background-color 160ms var(--ease);
}

.page-about .about-cell:hover,
.page-about .about-cell:focus-within {
  background-color: var(--green);
}

.page-about .about-cell--soft {
  background-color: var(--ink-3);
}

.page-about .about-cell--soft:hover {
  background-color: var(--green-deep);
}

.page-about .about-cell__code {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--volt);
}

.page-about .about-cell--soft .about-cell__code {
  color: var(--grey);
}

.page-about .about-cell__note {
  font-size: 12px;
  line-height: 1.55;
  color: rgba(244, 241, 232, 0.62);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-timeline {
  margin: 26px 0 24px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-era {
  border-top: 1px solid var(--rule);
}

.page-about .about-era__sum {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 20px;
  gap: 14px;
  align-items: center;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-era__sum:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--green);
}

.page-about .about-era__name {
  font-size: 16px;
  line-height: 1.5;
  color: var(--paper-ink);
}

.page-about .about-era__mark {
  position: relative;
  justify-self: end;
  width: 12px;
  height: 12px;
  color: var(--green);
}

.page-about .about-era__mark::before,
.page-about .about-era__mark::after {
  content: "";
  position: absolute;
  background-color: currentColor;
}

.page-about .about-era__mark::before {
  top: 5px;
  left: 0;
  width: 12px;
  height: 2px;
}

.page-about .about-era__mark::after {
  top: 0;
  left: 5px;
  width: 2px;
  height: 12px;
  transition: transform 200ms var(--ease);
}

.page-about .about-era[open] .about-era__mark::after {
  transform: scaleY(0);
}

.page-about .about-era__body {
  padding: 0 0 20px 76px;
}

.page-about .about-era__body p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(26, 23, 18, 0.72);
}

.page-about .about-era__body .about-link {
  color: var(--green);
  border-bottom-color: rgba(12, 59, 46, 0.4);
}

/* ---------- 图片 ---------- */

.page-about .about-media {
  margin: 30px 0 0;
}

.page-about .about-media--sq {
  max-width: 440px;
}

.page-about .about-media--wide {
  max-width: 620px;
}

.page-about .about-media--full {
  max-width: 100%;
}

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

.page-about .about-media .media-frame__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
}

.page-about .about-sec--dark .about-media .media-frame__cap,
.page-about .about-sec--green .about-media .media-frame__cap {
  color: var(--grey);
}

.page-about .about-sec--paper .about-media .media-frame__cap {
  color: rgba(26, 23, 18, 0.55);
}

/* ---------- 结尾按钮组 ---------- */

.page-about .about-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-acts .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-team__row {
    grid-template-columns: 60px 150px minmax(0, 1fr);
  }

  .page-about .about-team__n {
    grid-row: auto;
  }
}

@media (min-width: 900px) {
  .page-about .about-top {
    padding: 26px 0 22px;
  }

  .page-about .about-hero {
    padding: 64px 0 84px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-hero__title {
    font-size: 46px;
  }

  .page-about .about-hero__text {
    font-size: 17px;
  }

  .page-about .about-sec {
    padding: 76px 0 84px;
  }

  .page-about .about-row {
    grid-template-columns: var(--about-railw) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 100px;
  }

  .page-about .about-rail__num {
    font-size: 50px;
  }

  .page-about .about-h {
    font-size: 34px;
  }

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

  .page-about .about-era__sum {
    grid-template-columns: 80px minmax(0, 1fr) 20px;
    gap: 20px;
  }

  .page-about .about-era__body {
    padding-left: 100px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-hero__title {
    font-size: 52px;
  }

  .page-about .about-h {
    font-size: 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cell,
  .page-about .about-link,
  .page-about .about-era__mark::after {
    transition: none;
  }
}
<<<END>>>