.page-about {
  --ov-gap: clamp(24px, 4vw, 44px);
  background: var(--ink-900);
  color: var(--text);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .ov-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .ov-link:hover,
.page-about .ov-link:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 首屏 ---------- */
.page-about .ov-hero {
  display: grid;
  gap: var(--ov-gap);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .ov-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .ov-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 16px;
  border-top: 1px solid var(--line);
}

.page-about .ov-rail__link {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--cool);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-about .ov-rail__link:hover,
.page-about .ov-rail__link:focus-visible {
  color: var(--lime);
}

.page-about .ov-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .ov-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 7.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ov-hero__lede {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.9;
  color: var(--cool);
}

.page-about .ov-hero__figure {
  margin: 0 0 var(--ov-gap);
  border: 1px solid var(--line);
}

.page-about .ov-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}

.page-about .ov-hero__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .ov-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-stats__item {
  background: var(--ink-850);
  padding: 18px 16px;
}

.page-about .ov-stats dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cool);
}

.page-about .ov-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 38px);
  line-height: 1;
  color: var(--amber);
}

.page-about .ov-stats dd span {
  font-size: 0.45em;
  margin-left: 3px;
  color: var(--cool);
}

/* ---------- 三段主题带 ---------- */
.page-about .ov-band {
  margin: clamp(40px, 7vw, 80px) 0 0;
}

.page-about .ov-band__head {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ov-band__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-band__seg {
  background: var(--ink-850);
  padding: 22px 20px 26px;
  border-top: 2px solid var(--seg, var(--lime));
}

.page-about .ov-band__seg--lime { --seg: var(--lime); }
.page-about .ov-band__seg--amber { --seg: var(--amber); }
.page-about .ov-band__seg--ember { --seg: var(--ember); }

.page-about .ov-band__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--seg, var(--lime));
}

.page-about .ov-band__seg h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ov-band__seg p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 通用章节 ---------- */
.page-about .ov-section {
  padding: clamp(36px, 6vw, 72px) 0 0;
  margin-top: clamp(36px, 6vw, 72px);
  border-top: 1px solid var(--line);
}

.page-about .ov-section__head {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ov-section h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 3.6vw, 2.25rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ov-prose {
  max-width: 64ch;
}

.page-about .ov-prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .ov-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 场景要点 ---------- */
.page-about .ov-points {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-points__item {
  background: var(--ink-850);
  padding: 20px 18px;
}

.page-about .ov-points__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.page-about .ov-points__item h3 {
  margin: 10px 0 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .ov-points__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 归档结构图 ---------- */
.page-about .ov-diagram {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 18px 14px;
  border: 1px solid var(--line);
  background: var(--ink-850);
  overflow-x: auto;
}

.page-about .ov-diagram__svg {
  display: block;
  width: 100%;
  min-width: 520px;
  height: auto;
}

.page-about .ov-diagram__svg text {
  fill: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  text-anchor: middle;
}

.page-about .ov-diagram__svg .ov-diagram__sub {
  fill: var(--cool);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.page-about .ov-diagram__box rect {
  fill: var(--ink-800);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .ov-diagram__leaf rect {
  fill: var(--ink-900);
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .ov-diagram__arrow path {
  fill: none;
  stroke: var(--lime);
  stroke-width: 1.5;
}

.page-about .ov-diagram figcaption {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .ov-layers {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ov-layers__item {
  border-left: 2px solid var(--amber);
  padding-left: 16px;
}

.page-about .ov-layers__no {
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.18em;
}

.page-about .ov-layers__item h3 {
  margin: 6px 0 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .ov-layers__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 更新流程 ---------- */
.page-about .ov-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-flow__step {
  background: var(--ink-850);
  padding: 20px 18px;
  border-left: 2px solid var(--line-strong);
  transition: border-color 160ms var(--ease);
}

.page-about .ov-flow__step:hover {
  border-left-color: var(--lime);
}

.page-about .ov-flow__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .ov-flow__step h3 {
  margin: 10px 0 8px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .ov-flow__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 团队手风琴 ---------- */
.page-about .ov-team {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-team__panel {
  background: var(--ink-850);
  padding: 0 18px;
}

.page-about .ov-team__panel summary {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
  transition: color 160ms var(--ease);
}

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

.page-about .ov-team__panel summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--amber);
}

.page-about .ov-team__panel[open] summary {
  color: var(--lime);
}

.page-about .ov-team__panel[open] summary::after {
  content: "–";
  color: var(--lime);
}

.page-about .ov-team__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cool);
}

.page-about .ov-team__panel p {
  margin: 0;
  padding: 0 0 20px;
  max-width: 60ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--cool);
}

/* ---------- 历程 ---------- */
.page-about .ov-history {
  display: grid;
  gap: var(--ov-gap);
}

.page-about .ov-history__figure {
  margin: 0;
  border: 1px solid var(--line);
  order: -1;
}

.page-about .ov-history__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .ov-history__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .ov-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line);
}

.page-about .ov-timeline__item {
  position: relative;
  padding: 0 0 28px 4px;
}

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

.page-about .ov-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--ember);
  transition: background 160ms var(--ease);
}

.page-about .ov-timeline__item:hover::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ov-timeline__stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ember);
}

.page-about .ov-timeline__item h3 {
  margin: 6px 0 8px;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .ov-timeline__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cool);
}

/* ---------- 服务与备案 ---------- */
.page-about .ov-facts {
  margin: clamp(20px, 3vw, 28px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ov-facts__item {
  background: var(--ink-850);
  padding: 16px 16px 18px;
}

.page-about .ov-facts dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cool);
}

.page-about .ov-facts dd {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ov-facts dd.num {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- 协作 ---------- */
.page-about .ov-collab {
  display: grid;
  gap: var(--ov-gap);
}

.page-about .ov-collab__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .ov-collab__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .ov-collab__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .ov-collab__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--cool);
}

.page-about .ov-tags {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 底部行动区 ---------- */
.page-about .ov-cta {
  margin-top: clamp(40px, 7vw, 80px);
  padding: clamp(26px, 5vw, 48px) clamp(20px, 4vw, 40px);
  border: 1px solid var(--line-strong);
  background: var(--ink-800);
}

.page-about .ov-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.3rem, 3.2vw, 2rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ov-cta p {
  margin: 0 0 22px;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--cool);
}

.page-about .ov-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ov-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .ov-hero {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .ov-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ov-rail__list {
    grid-template-columns: 1fr;
    gap: 0;
  }

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

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

  .page-about .ov-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ov-history {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ov-history__figure {
    order: 0;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ov-collab {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .ov-section h2 {
    max-width: 24ch;
  }
}

@media (min-width: 1180px) {
  .page-about .ov-hero {
    grid-template-columns: 264px minmax(0, 1fr);
  }

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

抱歉，我重复输出了标记。正确输出应为一次 MAIN_HTML 与一次 PAGE_CSS。以上内容中，PAGE_CSS 区块内的 CSS 完整有效，请以第一次出现的  之后的样式为准。