.page-about {
  position: relative;
  overflow-x: hidden;
  background-color: var(--navy);
  background-image:
    linear-gradient(to right, rgba(242, 237, 228, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(242, 237, 228, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--ink);
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(22px, 4vw, 48px) 0 clamp(38px, 7vw, 84px);
}

.page-about .about-hero__wedge {
  position: absolute;
  right: -14%;
  bottom: -28%;
  width: min(820px, 88%);
  height: 132%;
  background: linear-gradient(148deg, rgba(193, 135, 60, 0.20), rgba(62, 143, 138, 0.13) 54%, rgba(14, 30, 51, 0) 80%);
  clip-path: polygon(100% 0, 100% 100%, 8% 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 26px;
}

.page-about .about-hero__rail {
  border-left: 1px solid var(--copper-line);
  padding-left: 14px;
}

.page-about .about-hero__rail .eyebrow {
  color: var(--copper);
}

.page-about .about-hero__rail-note {
  margin: 10px 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .about-hero__rail-line {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  max-width: 26ch;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.035em;
  color: var(--warm);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--ink-soft);
}

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

.page-about .about-hero__facts li {
  background: var(--navy-deep);
  padding: 13px 14px 15px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-mute);
}

.page-about .about-hero__facts .num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(20px, 5vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--copper);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

/* ---------- 图片与图注 ---------- */
.page-about .about-figure {
  margin: 0;
  padding: clamp(26px, 5vw, 52px) 0 0;
}

.page-about .about-figure__frame {
  aspect-ratio: 14 / 9;
  border: 1px solid var(--line);
  background: var(--navy-deep);
}

.page-about .about-figure__frame img,
.page-about .about-inline-figure__frame img,
.page-about .about-archive__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.03);
}

.page-about .about-figure__caption {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--copper-line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink-mute);
}

.page-about .about-figure__caption .meta-note {
  margin-left: 6px;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  border-top: 1px solid var(--line);
  padding: clamp(40px, 7vw, 88px) 0;
}

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

.page-about .about-rail__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.6vw, 30px);
  line-height: 1.24;
  letter-spacing: -0.03em;
  color: var(--warm);
}

.page-about .about-head {
  margin-bottom: 6px;
}

.page-about .about-head .eyebrow {
  color: var(--copper);
}

/* ---------- 竖向时间刻度 ---------- */
.page-about .about-scale {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .about-scale li {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-scale li:first-child {
  border-top: 1px solid var(--line-strong);
}

.page-about .about-scale a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 44px;
  padding: 12px 10px 12px 14px;
  border-left: 1px solid transparent;
  margin-left: -1px;
  text-decoration: none;
  font-size: 14px;
  color: var(--ink-soft);
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease;
}

.page-about .about-scale a:hover,
.page-about .about-scale a:focus-visible {
  color: var(--warm);
  border-left-color: var(--copper);
  background: rgba(193, 135, 60, 0.09);
}

.page-about .about-scale a:focus-visible {
  outline: 1px solid var(--seal);
  outline-offset: -1px;
}

.page-about .about-scale .num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .about-rail .meta-note {
  display: block;
  margin-top: 16px;
  max-width: 34ch;
  line-height: 1.7;
}

/* ---------- 沿革阶段 ---------- */
.page-about .milestone {
  border-top: 1px solid var(--line);
  padding: 22px 0 26px;
}

.page-about .milestone:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .milestone h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-h3);
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--warm);
}

.page-about .milestone p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-stamp-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
}

.page-about .about-stamp-line .meta-note {
  line-height: 1.6;
}

.page-about .about-inline-figure {
  margin: 8px 0 30px;
}

.page-about .about-inline-figure__frame {
  aspect-ratio: 12 / 7;
  border: 1px solid var(--line);
  background: var(--navy-deep);
}

/* ---------- 全幅统计带 ---------- */
.page-about .about-band {
  padding: clamp(30px, 5vw, 52px) 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-band .eyebrow {
  color: var(--clay);
}

.page-about .about-stats {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
}

.page-about .about-stats li {
  border-top: 1px solid rgba(14, 30, 51, 0.22);
  padding-top: 14px;
}

.page-about .about-stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--clay);
}

.page-about .about-stats .stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 标签页 ---------- */
.page-about .tabs {
  margin-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
}

.page-about .tab {
  appearance: none;
  flex: 1 1 auto;
  min-height: 46px;
  padding: 13px 16px;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  font: inherit;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--cool);
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease, background-color 120ms ease;
}

.page-about .tab:hover {
  color: var(--warm);
  background: rgba(242, 237, 228, 0.04);
}

.page-about .tab[aria-selected="true"] {
  color: var(--warm);
  border-bottom-color: var(--seal);
  background: rgba(166, 37, 43, 0.10);
}

.page-about .tab:focus-visible {
  outline: 1px solid var(--seal);
  outline-offset: -2px;
}

.page-about .tabpanel {
  padding: 24px 0 0;
}

.page-about .tabpanel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-h3);
  letter-spacing: -0.02em;
  color: var(--warm);
}

.page-about .tabpanel p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 门类九组 ---------- */
.page-about .about-groups {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .about-group {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 16px 22px;
  background: rgba(7, 19, 36, 0.42);
}

.page-about .about-group__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-group__name {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-group__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-group__items li {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--teal);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-soft);
}

.page-about .about-group:nth-child(3n + 2) .about-group__items li {
  border-left-color: var(--moss);
}

.page-about .about-group:nth-child(3n + 3) .about-group__items li {
  border-left-color: var(--clay);
}

.page-about #menlei > .container > .meta-note {
  display: block;
  margin-top: 16px;
  line-height: 1.7;
}

/* ---------- 表格 ---------- */
.page-about .table-scroll {
  margin-top: 24px;
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-about .about-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-table__caption {
  padding: 12px 14px;
  text-align: left;
  caption-side: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.6;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 9px 14px;
  min-height: 38px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-soft);
}

.page-about .about-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cool);
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}

.page-about .about-table tbody tr:nth-child(even) {
  background: rgba(7, 19, 36, 0.5);
}

.page-about .about-table .num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--copper);
  white-space: nowrap;
}

.page-about .about-table tfoot td {
  border-top: 1px solid var(--copper-line);
  border-bottom: 0;
  font-weight: 700;
  color: var(--warm);
}

/* ---------- 档案段 ---------- */
.page-about .about-archive {
  display: grid;
  gap: 26px;
}

.page-about .about-archive__body p {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-archive__body .eyebrow {
  color: var(--copper);
}

.page-about .about-archive__body .about-rail__title {
  margin-top: 12px;
}

.page-about .about-spec {
  margin: 24px 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-spec__row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-spec__row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cool);
}

.page-about .about-spec__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--warm);
}

.page-about .about-archive__body .about-stamp-line {
  margin-top: 22px;
}

.page-about .about-archive__media {
  margin: 0;
}

.page-about .about-archive__frame {
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  background: var(--navy-deep);
}

/* ---------- 校准与版本 ---------- */
.page-about .about-notes {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-note {
  border-bottom: 1px solid var(--line);
  border-left: 1px solid var(--copper-line);
  padding: 18px 16px 20px;
  background: rgba(7, 19, 36, 0.38);
}

.page-about .about-note h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16.5px;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-note p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 继续核对 ---------- */
.page-about .about-next {
  border-bottom: 1px solid var(--line);
}

.page-about .about-next .section-head__note {
  margin-top: 10px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-next__list li {
  border-bottom: 1px solid var(--line);
}

.page-about .about-next__list a {
  display: grid;
  gap: 6px;
  min-height: 48px;
  padding: 14px 14px 15px 12px;
  border-left: 1px solid transparent;
  text-decoration: none;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  background: rgba(193, 135, 60, 0.08);
  border-left-color: var(--copper);
}

.page-about .about-next__list a:focus-visible {
  outline: 1px solid var(--seal);
  outline-offset: -1px;
}

.page-about .about-next__path {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.page-about .about-next__label {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.page-about .about-next__list a:hover .about-next__label,
.page-about .about-next__list a:focus-visible .about-next__label {
  color: var(--warm);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-note:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .page-about .about-spec__row {
    grid-template-columns: minmax(120px, 1fr) minmax(0, 3fr);
    align-items: baseline;
    gap: 18px;
  }

  .page-about .about-next__list a {
    grid-template-columns: minmax(140px, 1fr) minmax(0, 5fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-archive {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .tabpanel {
    padding: 26px 0 0 24px;
    border-left: 1px solid var(--line);
  }

  .page-about .tab {
    flex: 0 0 auto;
    padding-inline: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(180px, 3fr) minmax(0, 8fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tab,
  .page-about .about-scale a,
  .page-about .about-next__list a {
    transition: opacity 120ms ease;
  }
}
<<<END>>>