.page-about {
  --ch-space: clamp(3.5rem, 9vw, 8rem);
  --ch-gap: clamp(1rem, 3vw, 2.5rem);
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad) clamp(3rem, 6vw, 5rem);
  color: var(--white);
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--cold);
  padding: clamp(1.25rem, 4vw, 2.5rem) 0 0;
}
.page-about .breadcrumb a {
  color: var(--cold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
  outline: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.75rem, 5vw, 3.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}
.page-about .about-kicker {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grass);
  margin: 0 0 clamp(1rem, 3vw, 1.75rem);
}
.page-about .about-hero h1 {
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(2.5rem, 8.5vw, 5rem);
  line-height: 1.03;
  letter-spacing: -.015em;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  max-width: 15ch;
}
.page-about .about-hero h1 span {
  display: block;
  color: var(--signal);
}
.page-about .about-lead {
  max-width: 60ch;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  color: var(--cold);
  margin: 0;
}
.page-about .about-facts {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-facts li {
  background: var(--field);
  padding: 1rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: .35rem;
  min-width: 0;
}
.page-about .fact-n {
  font-family: var(--mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  line-height: 1;
  font-weight: 700;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}
.page-about .fact-l {
  font-size: .8125rem;
  color: var(--cold);
  letter-spacing: .04em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapters {
  max-width: none;
}
.page-about .about-chapter {
  padding: var(--ch-space) 0;
  border-bottom: 1px solid rgba(70, 86, 94, .65);
}
.page-about .about-chapter--last {
  border-bottom: 0;
}
.page-about .chapter-grid {
  display: grid;
  gap: var(--ch-gap);
  grid-template-columns: minmax(0, 1fr);
}
.page-about .chapter-num {
  font-family: var(--narrow);
  font-weight: 800;
  font-size: clamp(3.4rem, 15vw, 6.5rem);
  line-height: .82;
  letter-spacing: -.04em;
  color: var(--grass);
  margin: 0;
  font-variant-numeric: tabular-nums;
}
.page-about .chapter-body h2 {
  font-family: var(--narrow);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.4vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -.005em;
  margin: 0 0 1rem;
  color: var(--white);
}
.page-about .chapter-body p {
  color: var(--cold);
  max-width: 64ch;
  margin: 0 0 1rem;
}
.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}
.page-about .chapter-body strong {
  color: var(--white);
  font-weight: 500;
}
.page-about .inline-link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 194, 75, .45);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
  outline: none;
}

/* ---------- 层级示意 ---------- */
.page-about .layer-diagram {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 1.75rem 0 .5rem;
}
.page-about .diagram-caption {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--grass);
  margin: 0 0 1.25rem;
}

/* ---------- 标签分组 ---------- */
.page-about .tag-groups {
  margin: 1.75rem 0;
  display: grid;
  gap: .75rem;
}
.page-about .tag-groups li {
  background: var(--field);
  border-left: 3px solid var(--grass);
  padding: .9rem 1.1rem;
}
.page-about .tag-groups h3 {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 .35rem;
  letter-spacing: .02em;
}
.page-about .tag-groups p {
  font-size: .9rem;
  color: var(--cold);
  margin: 0;
  max-width: none;
}

/* ---------- 口径清单 ---------- */
.page-about .spec-list {
  margin: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}
.page-about .spec-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .25rem;
  padding: .85rem 0;
  border-bottom: 1px solid rgba(70, 86, 94, .65);
}
.page-about .spec-row dt {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--grass);
}
.page-about .spec-row dd {
  margin: 0;
  font-size: .95rem;
  color: var(--white);
}

/* ---------- 版本时间线 ---------- */
.page-about .version-timeline {
  margin: 1.75rem 0 0;
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
}
.page-about .version-timeline li {
  position: relative;
  padding-bottom: 2.25rem;
}
.page-about .version-timeline li:last-child {
  padding-bottom: .25rem;
}
.page-about .version-timeline li::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 4.5px);
  top: .6rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--grass);
  box-shadow: 0 0 0 3px var(--ink);
}
.page-about .version-timeline li:last-child::before {
  background: var(--signal);
}
.page-about .version-tag {
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--grass);
  margin: 0 0 .35rem;
}
.page-about .version-timeline li:last-child .version-tag {
  color: var(--signal);
}
.page-about .version-timeline h3 {
  font-family: var(--narrow);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .01em;
  color: var(--white);
  margin: 0 0 .35rem;
}
.page-about .version-timeline p {
  font-size: .92rem;
  color: var(--cold);
  margin: 0;
  max-width: 56ch;
}

/* ---------- 图片区块 ---------- */
.page-about .method-visual,
.page-about .team-photo {
  margin: 2rem 0 0;
  border: 1px solid var(--line);
  background: var(--field);
}
.page-about .method-visual img,
.page-about .team-photo img,
.page-about .version-band img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  filter: saturate(.7) brightness(.78) contrast(1.05);
}
.page-about .method-visual figcaption,
.page-about .team-photo figcaption {
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--cold);
  padding: .65rem .9rem;
  border-top: 1px solid var(--line);
}
.page-about .version-band {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.page-about .version-band img {
  aspect-ratio: 1400 / 600;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  margin: 1.75rem 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .team-cell {
  background: var(--field);
  padding: 1.1rem 1rem;
  min-width: 0;
}
.page-about .team-n {
  font-family: var(--mono);
  font-size: 1.5rem;
  line-height: 1;
  font-weight: 700;
  color: var(--signal);
  margin: 0 0 .55rem;
  font-variant-numeric: tabular-nums;
}
.page-about .team-cell h3 {
  font-family: var(--sans);
  font-size: .95rem;
  font-weight: 700;
  color: var(--white);
  margin: 0 0 .35rem;
}
.page-about .team-cell p {
  font-size: .84rem;
  line-height: 1.6;
  color: var(--cold);
  margin: 0;
  max-width: none;
}

/* ---------- 校对流程 ---------- */
.page-about .process-pair {
  display: grid;
  gap: .75rem;
  margin-top: 1.5rem;
}
.page-about .process-step {
  border: 1px solid var(--line);
  padding: 1rem 1.1rem;
  background: rgba(16, 46, 34, .55);
}
.page-about .step-label {
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--amber);
  margin: 0 0 .45rem;
}
.page-about .process-step p:last-child {
  font-size: .9rem;
  color: var(--cold);
  margin: 0;
  max-width: none;
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  margin-top: clamp(3rem, 8vw, 5.5rem);
  padding: clamp(2rem, 6vw, 3.5rem) clamp(1.25rem, 4vw, 3rem);
  background: var(--field);
  border-left: 3px solid var(--signal);
}
.page-about .about-outro h2 {
  font-family: var(--narrow);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--white);
}
.page-about .about-outro p {
  color: var(--cold);
  max-width: 64ch;
  margin: 0 0 1.75rem;
}
.page-about .outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .chapter-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(1.5rem, 4vw, 3rem);
  }
  .page-about .chapter-num {
    position: sticky;
    top: 5.5rem;
  }
  .page-about .spec-row {
    grid-template-columns: minmax(9rem, 12rem) minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .process-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .method-visual,
  .page-about .team-photo {
    margin-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .chapter-grid {
    grid-template-columns: minmax(7rem, 15rem) minmax(0, 1fr) minmax(0, 20rem);
    gap: clamp(1.5rem, 3vw, 2.75rem);
  }
  .page-about .chapter-body {
    grid-column: 2 / 3;
  }
  .page-about .method-visual,
  .page-about .team-photo {
    grid-column: 3 / 4;
    grid-row: 1 / 2;
    align-self: start;
  }
  .page-about .layer-diagram {
    max-width: 380px;
  }
}

/* ---------- 窄屏收拢 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero h1 {
    max-width: none;
  }
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .outro-actions .btn {
    width: 100%;
    text-align: center;
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .breadcrumb a,
  .page-about .inline-link {
    transition: none;
  }
  .page-about .chapter-num {
    position: static;
  }
}
<<<END>>>