.page-about {
  background: var(--night);
  color: var(--text);
}

/* 顶部上下文条 */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-topbar__stamp {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: 2rem;
  padding-top: 1.75rem;
  padding-bottom: 3.25rem;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  padding: 0.5rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(155deg, rgba(15, 77, 52, 0.55), transparent 58%),
    var(--deep);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 46px;
  height: 46px;
  background: var(--lime);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-hero__caption {
  margin-top: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-hero__title {
  margin: 0.75rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.5rem, 9vw, 5rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 40em;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* 章节骨架 */
.page-about .about-section {
  display: grid;
  gap: 1.25rem;
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  border-top: 1px solid var(--line);
}

.page-about .about-section__index {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.page-about .about-section__num {
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .about-section__kicker {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-section__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-section__body > p {
  margin: 0 0 1rem;
  max-width: 40em;
  line-height: 1.8;
}

.page-about .about-note {
  margin-top: 1.25rem !important;
  padding-left: 1rem;
  border-left: 2px solid var(--brand-green);
  color: var(--text);
  font-size: 0.9375rem;
}

.page-about .about-quote {
  margin: 1.75rem 0 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--lime);
  font-family: var(--font-display);
  font-size: 1.375rem;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-quote p {
  margin: 0;
}

/* 通用图块 */
.page-about .about-figure {
  margin: 1.75rem 0 0;
  border: 1px solid var(--line);
  background: var(--deep);
  padding: 0.5rem;
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure__caption {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--steel);
}

/* 团队 2×2 细线网格 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-card {
  background: var(--deep);
  padding: 1.35rem 1.15rem 1.5rem;
  transition: background 0.2s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: var(--panel);
}

.page-about .team-card__label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .team-card__desc {
  margin: 0.55rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

/* 四道工序 */
.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .step {
  background: var(--night);
  padding: 1.25rem 1.15rem 1.35rem;
}

.page-about .step__num {
  display: block;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .step__title {
  margin: 0.7rem 0 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--mist);
  letter-spacing: 0.01em;
}

.page-about .step__desc {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text);
}

/* 覆盖范围矩阵 */
.page-about .matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .matrix__cell {
  background: var(--deep);
  padding: 1.2rem 1rem 1.3rem;
}

.page-about .matrix__value {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.25rem;
  line-height: 1;
  color: var(--lime);
}

.page-about .matrix__label {
  margin: 0.45rem 0 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text);
}

/* 年份跳转 + 时间轴 */
.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .year-jump a {
  display: inline-block;
  padding: 0.32rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--steel);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .year-jump a:hover,
.page-about .year-jump a:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .timeline {
  position: relative;
  margin: 2rem 0 0;
  padding: 0 0 0 1.75rem;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), var(--brand-green) 45%, var(--line));
}

.page-about .tl-node {
  position: relative;
  padding-bottom: 1.9rem;
  scroll-margin-top: 5rem;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 0.5rem;
  width: 11px;
  height: 11px;
  background: var(--night);
  border: 1px solid var(--lime);
  border-radius: 50%;
}

.page-about .tl-node__year {
  display: inline-block;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .tl-node__title {
  margin: 0.35rem 0 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .tl-node__desc {
  margin: 0.45rem 0 0;
  max-width: 38em;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

/* 读者指标 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metrics__cell {
  background: var(--deep);
  padding: 1.15rem 1rem 1.2rem;
  outline: none;
  transition: background 0.18s var(--ease);
}

.page-about .about-metrics__cell:hover,
.page-about .about-metrics__cell:focus-visible {
  background: var(--panel);
}

.page-about .about-metrics__num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--mist);
}

.page-about .about-metrics__label {
  margin: 0.45rem 0 0;
  font-size: 0.8125rem;
  color: var(--steel);
}

.page-about .about-metrics__hint {
  margin: 0.5rem 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text);
  opacity: 0.55;
  transition: opacity 0.18s var(--ease);
}

.page-about .about-metrics__cell:hover .about-metrics__hint,
.page-about .about-metrics__cell:focus-visible .about-metrics__hint,
.page-about .about-metrics__cell:focus-within .about-metrics__hint {
  opacity: 1;
}

/* 合作 */
.page-about .coop-list {
  display: grid;
  gap: 1px;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .coop-item {
  display: grid;
  gap: 0.4rem;
  padding: 1rem 0;
  background: var(--night);
}

.page-about .coop-item__tag {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--yellow);
}

.page-about .coop-item__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-cta {
  margin-top: 2rem;
  padding: 1.5rem 1.15rem;
  border: 1px solid var(--brand-green);
  background: linear-gradient(140deg, rgba(15, 77, 52, 0.45), transparent 70%), var(--deep);
}

.page-about .about-cta__text {
  margin: 0 0 1.15rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-cta__text a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
  word-break: break-all;
}

/* 桌面布局 */
@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
    padding-top: 2.5rem;
    padding-bottom: 4.5rem;
  }

  .page-about .about-hero__lede {
    font-size: 1.125rem;
  }

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

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

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

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

  .page-about .coop-item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
    padding: 1.15rem 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-section {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 3rem;
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }

  .page-about .about-section__index {
    position: sticky;
    top: 2.5rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }

  .page-about .about-section__index::after {
    content: "";
    display: block;
    width: 34px;
    height: 2px;
    margin-top: 0.6rem;
    background: var(--lime);
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 1.75rem 1.75rem;
  }

  .page-about .about-cta__text {
    margin-bottom: 0;
    max-width: 46em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-metrics__cell,
  .page-about .about-metrics__hint,
  .page-about .year-jump a {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>