.page-about {
  --about-narr: 62ch;
  --about-pad: clamp(44px, 7vw, 88px);
  background: var(--void);
  color: var(--body-text);
  overflow-x: clip;
  isolation: isolate;
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--idx);
}
.page-about .breadcrumb a {
  color: var(--idx);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .crumb-sep {
  margin: 0 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 3vw, 32px) 0 clamp(28px, 5vw, 52px);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  right: -14%;
  top: 8%;
  width: min(58vw, 560px);
  height: min(34vw, 280px);
  background: linear-gradient(118deg, var(--glow-cyan), transparent 64%);
  transform: skewY(-8deg);
  pointer-events: none;
}
.page-about h1 {
  margin: 10px 0 0;
}
.page-about .hero-body {
  display: grid;
  gap: 26px;
  margin-top: clamp(22px, 4vw, 34px);
}
.page-about .hero-lede {
  max-width: 60ch;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--body-text);
}
.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .hero-stats .stat {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--rock);
  box-shadow: var(--shadow-hard-sm);
  transition: border-color var(--ease);
}
.page-about .hero-stats .stat:hover {
  border-color: var(--cyan);
}
.page-about .hero-stats .stat-value {
  display: block;
  font-size: clamp(20px, 3vw, 27px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .hero-stats .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--idx);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  display: flex;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}
.page-about .about-toc a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 16px;
  font-size: 13px;
  color: var(--idx);
  text-decoration: none;
  border-right: 1px solid var(--line);
  transition: color var(--ease), background var(--ease), box-shadow var(--ease);
}
.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--paper);
  background: var(--rock);
}
.page-about .about-toc a[aria-current="true"] {
  color: var(--paper);
  background: var(--rock);
  box-shadow: inset 0 -2px 0 var(--cyan);
}
.page-about .toc-num {
  font-size: 11px;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: var(--about-pad) 0;
  position: relative;
}
.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line);
}
.page-about .section-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 42px);
}
.page-about .section-title {
  margin: 0;
  font-size: clamp(23px, 3.3vw, 36px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.page-about .sec-num {
  margin-right: 12px;
  font-size: 0.48em;
  vertical-align: 0.28em;
  color: var(--cyan);
}
.page-about .section-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--idx);
}
.page-about .narr {
  max-width: var(--about-narr);
}
.page-about .narr p {
  margin: 0 0 1.35em;
  font-size: 16.5px;
  line-height: 1.8;
}
.page-about .narr p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-shell {
  position: relative;
  border: 1px solid var(--line);
  background: var(--void-2);
  overflow: hidden;
  box-shadow: 4px 4px 0 var(--ink);
}
.page-about .timeline-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.85);
}
.page-about .timeline-inner {
  position: relative;
  padding: clamp(20px, 4vw, 36px) 0 clamp(10px, 2vw, 18px);
}
.page-about .tl-rail {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0 clamp(14px, 3vw, 26px) 10px;
  scrollbar-width: thin;
}
.page-about .tl-rail:focus-visible {
  outline: 1px dashed var(--cyan);
  outline-offset: -4px;
}
.page-about .tnode {
  flex: 0 0 min(310px, 82vw);
  scroll-snap-align: start;
  padding: 0 18px 6px 20px;
  border-left: 1px solid rgba(46, 242, 214, 0.35);
}
.page-about .tnode-year {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 9px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--cyan);
  background: rgba(6, 10, 20, 0.65);
}
.page-about .tnode h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2.3vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}
.page-about .tnode p {
  margin: 0 0 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--body-text);
}
.page-about .tl-hint {
  margin: 0;
  padding: 0 clamp(14px, 3vw, 26px) 10px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--idx);
}

/* ---------- 团队 ---------- */
.page-about .crew-grid {
  display: grid;
  gap: 30px;
}
.page-about .crew-copy .narr p {
  font-size: 16px;
}
.page-about .crew {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}
.page-about .crew li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 13px 15px;
  background: var(--rock);
  transition: background var(--ease);
}
.page-about .crew li:hover {
  background: var(--void-2);
}
.page-about .crew-num {
  grid-row: span 2;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--cyan);
}
.page-about .crew-role {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
}
.page-about .crew-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--idx);
}
.page-about .team-figure {
  margin: 0;
}
.page-about .wide-figure {
  margin: 0 0 clamp(28px, 4.5vw, 48px);
}

/* ---------- 四道校对流程 ---------- */
.page-about .flow {
  display: grid;
  gap: 10px;
}
.page-about .flow-step {
  border: 1px solid var(--line);
  background: var(--rock);
  transition: border-color var(--ease);
}
.page-about .flow-step:hover {
  border-color: rgba(46, 242, 214, 0.45);
}
.page-about .flow-step[open] {
  border-color: rgba(46, 242, 214, 0.7);
}
.page-about .flow-step summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
}
.page-about .flow-step summary::-webkit-details-marker {
  display: none;
}
.page-about .flow-num {
  padding: 3px 6px;
  font-size: 11px;
  color: var(--cyan);
  border: 1px solid var(--line);
}
.page-about .flow-title {
  font-size: 15px;
  font-weight: 700;
}
.page-about .flow-body {
  padding: 0 16px 16px;
}
.page-about .checklist {
  margin: 0;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--body-text);
}
.page-about .checklist li {
  margin-bottom: 6px;
}
.page-about .checklist li:last-child {
  margin-bottom: 0;
}
.page-about .flow-arrow {
  width: 28px;
  height: 12px;
  justify-self: center;
  color: var(--cyan);
  transform: rotate(90deg);
}

/* ---------- 合作 ---------- */
.page-about .collab {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 20px;
}
.page-about .collab li {
  padding: 2px 0 2px 18px;
  border-left: 2px solid var(--violet);
}
.page-about .collab strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}
.page-about .collab span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--idx);
}

/* ---------- 位置与响应 ---------- */
.page-about .place {
  padding: clamp(26px, 4.5vw, 52px) clamp(18px, 4vw, 46px);
  background: var(--paper);
  color: var(--void);
  box-shadow: 4px 4px 0 var(--ink);
}
.page-about .place-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}
.page-about .place-head h2 {
  margin: 0 0 8px;
  font-size: clamp(22px, 3.1vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  color: #0A1224;
}
.page-about .place .sec-num {
  color: #0B7A6A;
}
.page-about .place-sub {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: #55637D;
}
.page-about .place-grid {
  display: grid;
  gap: 22px;
}
.page-about .place-body {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: #23304A;
}
.page-about .place-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border: 1px solid rgba(6, 10, 20, 0.16);
  background: rgba(6, 10, 20, 0.16);
}
.page-about .place-facts li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  background: var(--paper);
  font-size: 13.5px;
}
.page-about .pf-k {
  color: #55637D;
}
.page-about .pf-v {
  font-family: var(--mono);
  font-weight: 700;
  color: #0B2A55;
  text-align: right;
}

/* ---------- 下一步卡片 ---------- */
.page-about .archive {
  padding: var(--about-pad) 0 calc(var(--about-pad) + 8px);
  border-top: 1px solid var(--line);
}
.page-about .archive-grid {
  display: grid;
  gap: 16px;
}
.page-about .archive-card {
  display: block;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  background: var(--rock);
  box-shadow: var(--shadow-hard-sm);
  color: var(--body-text);
  text-decoration: none;
  transition: border-color var(--ease), transform var(--ease);
}
.page-about .archive-card:hover,
.page-about .archive-card:focus-visible {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  outline: none;
}
.page-about .archive-kicker {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--lava);
}
.page-about .archive-card h3 {
  margin: 9px 0 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .archive-lead {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--idx);
}
.page-about .archive-note {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cyan);
  transition: max-height var(--ease), opacity var(--ease), margin var(--ease);
}
.page-about .archive-card:hover .archive-note,
.page-about .archive-card:focus-visible .archive-note {
  max-height: 7em;
  margin-top: 12px;
  opacity: 1;
}
@media (hover: none) {
  .page-about .archive-note {
    max-height: none;
    margin-top: 12px;
    opacity: 1;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .hero-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
    align-items: start;
    gap: 44px;
  }
  .page-about .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .section-head {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: 40px;
  }
  .page-about .section-desc {
    max-width: 34ch;
    text-align: right;
    padding-top: 6px;
  }
  .page-about .collab {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 32px;
  }
  .page-about .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .archive-card:nth-child(2n) {
    margin-top: 38px;
  }
}

@media (min-width: 900px) {
  .page-about .narr {
    margin-left: 56px;
  }
  .page-about .crew-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
    gap: 52px;
    align-items: start;
  }
  .page-about .place-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 44px;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .flow {
    grid-template-columns: 1fr 30px 1fr 30px 1fr 30px 1fr;
    align-items: start;
    gap: 0;
  }
  .page-about .flow-arrow {
    transform: none;
    margin-top: 25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .archive-note,
  .page-about .archive-card,
  .page-about .about-toc a,
  .page-about .crew li {
    transition-duration: 0.01ms;
  }
}
<<<END>>>