.page-about {
  --about-pad-x: clamp(20px, 4vw, 40px);
  --about-band: clamp(48px, 7vw, 88px);
  --about-band-pad: clamp(18px, 3vw, 32px);
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-top {
  border-bottom: var(--bw) solid var(--concrete);
  background: var(--ink);
}

.page-about .about-top__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 52px) var(--about-pad-x) clamp(32px, 5vw, 60px);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--iron);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .breadcrumb a {
  color: var(--bone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.page-about .breadcrumb a:hover {
  border-bottom-color: var(--red);
}

.page-about .breadcrumb__sep {
  color: var(--red);
  font-family: var(--font-mono);
}

.page-about .about-hero__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yellow);
  margin: 0 0 clamp(16px, 2vw, 22px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8vw, 88px);
  line-height: 0.96;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  max-width: 17ch;
  color: var(--bone);
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.8);
  max-width: 46ch;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 20px 0 0;
  border-top: var(--bw) solid var(--concrete);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 24px);
}

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

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--yellow);
}

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

/* ---------- 移动端章节目录 ---------- */

.page-about .about-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  background: var(--ink);
  border-bottom: var(--bw) solid var(--concrete);
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc ol {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0 var(--about-pad-x);
  min-width: max-content;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--bone);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}

.page-about .about-toc a:hover {
  border-bottom-color: var(--yellow);
}

.page-about .about-toc a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--red);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--about-pad-x);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 侧边章节轨 ---------- */

.page-about .about-rail {
  display: none;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    padding: 8px 0 var(--about-band);
    max-width: 150px;
  }
}

.page-about .about-rail__brand {
  margin: 0 0 28px;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.24em;
  line-height: 1;
  color: var(--iron);
  max-height: 180px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0 7px 12px;
  border-left: 3px solid var(--concrete);
  color: var(--iron);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.page-about .about-rail__link:hover {
  color: var(--bone);
  border-left-color: var(--iron);
}

.page-about .about-rail__link.is-active {
  color: var(--bone);
  border-left-color: var(--red);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--red);
}

.page-about .about-rail__link.is-active .about-rail__num {
  color: var(--yellow);
}

/* ---------- 章节 ---------- */

.page-about .chapter {
  padding: var(--about-band) 0;
  border-top: var(--bw) solid var(--concrete);
  min-width: 0;
}

.page-about .about-content > .chapter:first-child {
  border-top: 0;
}

.page-about .chapter--green {
  background: var(--green);
  border-top-color: rgba(245, 242, 234, 0.16);
  padding-left: var(--about-band-pad);
  padding-right: var(--about-band-pad);
  margin-left: calc(var(--about-band-pad) * -1);
  margin-right: calc(var(--about-band-pad) * -1);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  column-gap: clamp(14px, 2.6vw, 30px);
  margin-bottom: clamp(18px, 2.8vw, 30px);
}

.page-about .chapter-head__num {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(44px, 7vw, 82px);
  line-height: 0.78;
  letter-spacing: -0.02em;
  color: var(--red);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.005em;
  margin: 0;
  color: var(--bone);
  min-width: 0;
}

.page-about .chapter-lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.82);
  max-width: 48ch;
}

.page-about .chapter--green .chapter-lead {
  color: rgba(245, 242, 234, 0.88);
}

/* ---------- 01 时间轴 ---------- */

.page-about .timeline {
  --tl-pad: clamp(18px, 3vw, 30px);
  border-left: var(--bw) solid var(--concrete);
  padding-left: var(--tl-pad);
  display: grid;
  gap: 0;
}

.page-about .tl-node {
  position: relative;
  padding-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-pad) * -1 - 8px);
  top: 11px;
  width: 14px;
  height: 14px;
  background: var(--red);
  border: var(--bw) solid var(--ink);
}

.page-about .tl-node--yellow::before {
  background: var(--yellow);
}

.page-about .tl-node__summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 1.6vw, 18px);
  padding: 5px 0;
  color: var(--bone);
}

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

.page-about .tl-node__summary::marker {
  content: "";
}

.page-about .tl-node__summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--iron);
  transition: color 0.15s ease;
}

.page-about .tl-node[open] .tl-node__summary::after {
  content: "\2212";
  color: var(--yellow);
}

.page-about .tl-node__summary:hover::after {
  color: var(--bone);
}

.page-about .tl-node__year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(17px, 2.4vw, 23px);
  letter-spacing: -0.01em;
  color: var(--yellow);
}

.page-about .tl-node__name {
  font-size: clamp(15px, 1.7vw, 17px);
  font-weight: 600;
  color: var(--bone);
  min-width: 0;
}

.page-about .tl-node__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 242, 234, 0.74);
  max-width: 52ch;
}

/* ---------- 02 统计与规格 ---------- */

.page-about .stat-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: var(--bw) solid rgba(245, 242, 234, 0.18);
  background: rgba(10, 18, 32, 0.72);
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .stat-block {
  padding: clamp(18px, 2.8vw, 28px);
  min-width: 0;
}

.page-about .stat-block + .stat-block {
  border-top: var(--bw) solid rgba(245, 242, 234, 0.18);
}

@media (min-width: 760px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .stat-block + .stat-block {
    border-top: 0;
    border-left: var(--bw) solid rgba(245, 242, 234, 0.18);
  }
}

.page-about .stat-block__figure {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .stat-block__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--yellow);
}

.page-about .stat-block__unit {
  font-size: 15px;
  font-weight: 600;
  color: var(--bone);
}

.page-about .stat-block__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 242, 234, 0.72);
}

.page-about .spec-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 22px);
}

@media (min-width: 800px) {
  .page-about .spec-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .spec {
  border: var(--bw) solid rgba(245, 242, 234, 0.16);
  border-left: var(--bw) solid var(--yellow);
  background: rgba(10, 18, 32, 0.42);
  padding: clamp(16px, 2.4vw, 22px);
  min-width: 0;
}

.page-about .spec__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .spec__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 242, 234, 0.74);
}

/* ---------- 图文分栏 ---------- */

.page-about .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .split--media-left {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
  .page-about .split--media-right {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  }
}

.page-about .split__body {
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  border: var(--bw) solid var(--bone);
  background: var(--ink);
  box-shadow: 6px 6px 0 var(--red-dark);
  min-width: 0;
}

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

.page-about .about-figure figcaption {
  margin: 0;
  padding: 12px 14px;
  border-top: var(--bw) solid rgba(245, 242, 234, 0.2);
  font-size: 13px;
  line-height: 1.65;
  color: var(--iron);
  background: var(--ink);
}

.page-about .about-figure--wide {
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 03 值班表 ---------- */

.page-about .duty-list {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  display: grid;
  border-top: var(--bw) solid var(--concrete);
}

.page-about .duty-list__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: var(--bw) solid var(--concrete);
}

@media (min-width: 620px) {
  .page-about .duty-list__row {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .duty-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--red);
}

.page-about .duty-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(245, 242, 234, 0.78);
  min-width: 0;
}

/* ---------- 04 档案清单 ---------- */

.page-about .archive-list {
  list-style: none;
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .archive-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: var(--bw) solid rgba(245, 242, 234, 0.16);
}

.page-about .archive-list li:first-child {
  border-top: var(--bw) solid rgba(245, 242, 234, 0.16);
}

.page-about .archive-list__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--yellow);
}

.page-about .archive-list__txt {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(245, 242, 234, 0.82);
  min-width: 0;
}

/* ---------- 05 合作伙伴 ---------- */

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 22px);
}

@media (min-width: 800px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .partner-card {
  border: var(--bw) solid var(--concrete);
  border-top: var(--bw) solid var(--red);
  background: var(--concrete);
  padding: clamp(18px, 2.6vw, 26px);
  min-width: 0;
}

.page-about .partner-card__figure {
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
}

.page-about .partner-card__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--yellow);
}

.page-about .partner-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(245, 242, 234, 0.76);
}

.page-about .partner-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: var(--bw) solid var(--teal);
  font-size: 15px;
  line-height: 1.78;
  color: var(--bone);
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  background: var(--yellow);
  color: var(--ink);
  border-top: var(--bw) solid var(--ink);
}

.page-about .about-cta__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 6vw, 68px) var(--about-pad-x);
}

.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .about-cta__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.005em;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .cta-btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  border: var(--bw) solid var(--ink);
  background: var(--ink);
  color: var(--bone);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 4px 4px 0 rgba(10, 18, 32, 0.32);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .cta-btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 rgba(10, 18, 32, 0.32);
}

.page-about .cta-btn--ghost {
  background: transparent;
  color: var(--ink);
  box-shadow: none;
  border-color: var(--ink);
}

.page-about .cta-btn--ghost:hover {
  transform: none;
  background: rgba(10, 18, 32, 0.08);
}

.page-about .about-cta__hint {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(10, 18, 32, 0.78);
  max-width: 56ch;
}

.page-about .about-cta__hint a {
  color: var(--red-dark);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 桌面端栅格与轨 ---------- */

@media (min-width: 1024px) {
  .page-about .about-toc {
    display: none;
  }

  .page-about .about-layout {
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .chapter {
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .chapter--green {
    padding-left: var(--about-band-pad);
    padding-right: var(--about-band-pad);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb a,
  .page-about .about-rail__link,
  .page-about .tl-node__summary::after,
  .page-about .cta-btn {
    transition: none;
  }

  .page-about .cta-btn:hover {
    transform: none;
  }
}
<<<END>>>