.page-about {
  background: var(--bg);
  color: var(--fg);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(2.25rem, 6vw, 4rem);
  background:
    radial-gradient(120% 85% at 88% 0%, rgba(198, 255, 61, 0.12), transparent 62%),
    radial-gradient(90% 70% at 0% 100%, rgba(184, 116, 79, 0.14), transparent 65%),
    linear-gradient(180deg, var(--c-ink) 0%, var(--c-carbon) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .ab-hero__text {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.15rem, 7vw, 3.85rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.page-about .ab-hero__lead {
  margin: 1.15rem 0 0;
  max-width: 46ch;
  font-size: var(--step-2);
  line-height: 1.78;
  color: var(--fg-muted);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  margin: 1.85rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-stat {
  border-top: 1px solid var(--line-strong);
  padding-top: 0.65rem;
  min-width: 0;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1.15;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 0.28rem;
  font-size: var(--step-0);
  letter-spacing: 0.14em;
  color: var(--fg-dim);
}

/* 首屏右侧数据面板 */
.page-about .ab-viz {
  position: relative;
  padding: clamp(1.25rem, 3.4vw, 2rem);
  overflow: hidden;
  border-left: 2px solid var(--accent);
}

.page-about .ab-viz::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -30%;
  width: 62%;
  aspect-ratio: 1;
  border: 1px solid var(--line-strong);
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about .ab-viz__status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: var(--step-0);
  letter-spacing: 0.16em;
  color: var(--fg-muted);
}

.page-about .ab-viz__big {
  margin: 0.55rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(3.4rem, 13vw, 5.4rem);
  line-height: 0.9;
  color: var(--accent);
  letter-spacing: -0.04em;
}

.page-about .ab-viz__cap {
  margin: 0.6rem 0 0;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 24ch;
}

.page-about .ab-viz__rows {
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.page-about .ab-viz__rows li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line);
  font-size: var(--step-1);
  color: var(--fg-muted);
}

.page-about .ab-viz__rows b {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--fg);
  white-space: nowrap;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  padding: clamp(2rem, 5vw, 4rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-toc {
  min-width: 0;
  border-top: 1px solid var(--line-strong);
  padding-top: 0.9rem;
}

.page-about .ab-toc__title {
  margin: 0 0 0.75rem;
  font-size: var(--step-0);
  letter-spacing: 0.2em;
  color: var(--fg-dim);
}

.page-about .ab-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
}

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--line);
  color: var(--fg-muted);
  font-size: var(--step-1);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(198, 255, 61, 0.07);
}

.page-about .ab-toc__list .num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--fg-dim);
  letter-spacing: 0.06em;
}

.page-about .ab-toc__list a:hover .num {
  color: var(--accent);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  padding: clamp(1.75rem, 4.5vw, 3rem) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 1.5rem;
}

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

.page-about .ab-section__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .ab-section__title {
  margin: 0.5rem 0 1.15rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-4);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--fg);
  max-width: 22ch;
}

.page-about .ab-prose {
  max-width: 66ch;
}

.page-about .ab-prose p {
  margin: 0 0 1rem;
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--fg-muted);
}

.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-quote {
  margin: 1.6rem 0 0;
  padding: 1.1rem 1.25rem;
  background: var(--c-linen);
  border-left: 3px solid var(--c-ember);
  max-width: 58ch;
}

.page-about .ab-quote p {
  margin: 0;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--c-ink);
  font-weight: 600;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 1.75rem 0 0;
  border: 1px solid var(--line);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.03);
}

.page-about .ab-figure .media__caption {
  padding: 0.7rem 0.9rem;
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--fg-muted);
  border-top: 1px solid var(--line);
  background: rgba(30, 58, 50, 0.4);
}

/* ---------- 标签矩阵 ---------- */
.page-about .ab-tagmatrix {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-tagmatrix__cell {
  padding: 1rem 1.05rem;
  background: var(--c-carbon);
  min-width: 0;
  transition: background-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .ab-tagmatrix__cell:hover,
.page-about .ab-tagmatrix__cell:focus-within {
  background: var(--c-moss);
  box-shadow: inset 2px 0 0 0 var(--accent);
}

.page-about .ab-tagmatrix__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  color: var(--fg);
  letter-spacing: 0.01em;
}

.page-about .ab-tagmatrix__cell:hover .ab-tagmatrix__name {
  color: var(--accent);
}

.page-about .ab-tagmatrix__desc {
  display: block;
  margin-top: 0.45rem;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--fg-muted);
}

/* ---------- 生产流程 ---------- */
.page-about .ab-flow {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  counter-reset: none;
}

.page-about .ab-flow__item {
  position: relative;
  padding: 1.1rem 1.15rem 1.2rem;
  background: var(--bg-glass);
  border: 1px solid var(--line);
  border-top: 2px solid var(--c-clay);
  min-width: 0;
}

.page-about .ab-flow__step {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .ab-flow__name {
  margin: 0.45rem 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  color: var(--fg);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .ab-cadence {
  margin-top: 1.5rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border-left: 2px solid var(--accent);
}

.page-about .ab-cadence__title {
  margin: 0 0 0.8rem;
  font-size: var(--step-0);
  letter-spacing: 0.2em;
  color: var(--accent);
}

.page-about .ab-cadence__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.7rem;
}

.page-about .ab-cadence__list li {
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--fg-muted);
  padding-left: 0;
}

.page-about .ab-cadence__list .num {
  display: inline-block;
  min-width: 5.6em;
  margin-right: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  color: var(--fg);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-section--partners {
  border-top: 1px solid var(--line);
}

.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 1.4rem;
  padding: clamp(1.2rem, 3.4vw, 1.9rem);
  background:
    linear-gradient(-8deg, rgba(184, 116, 79, 0.18) 0%, rgba(184, 116, 79, 0.02) 58%),
    var(--c-moss);
  border: 1px solid var(--line);
}

.page-about .ab-partners__count {
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1rem;
}

.page-about .ab-partners__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(3rem, 12vw, 4.4rem);
  line-height: 0.9;
  color: var(--c-linen);
  letter-spacing: -0.04em;
}

.page-about .ab-partners__cap {
  margin: 0.5rem 0 0;
  font-size: var(--step-1);
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 20ch;
}

.page-about .ab-partners__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1.05rem;
}

.page-about .ab-partners__item h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  color: var(--fg);
}

.page-about .ab-partners__item p {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.78;
  color: var(--fg-muted);
}

.page-about .ab-partners__note {
  margin: 1.1rem 0 0;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .ab-partners__note a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, 0.45);
}

.page-about .ab-partners__note a:hover,
.page-about .ab-partners__note a:focus-visible {
  color: var(--c-linen);
  border-bottom-color: var(--c-linen);
}

/* ---------- 年代带 ---------- */
.page-about .ab-era {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 2px solid var(--c-clay);
}

.page-about .ab-era__item {
  background: var(--c-ink);
  padding: 1.05rem 1.05rem 1.25rem;
  min-width: 0;
  transition: background-color 0.22s ease, transform 0.22s ease;
}

.page-about .ab-era__item:hover {
  background: var(--c-carbon);
  transform: translateY(-3px);
}

.page-about .ab-era__year {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  background: var(--accent);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .ab-era__title {
  margin: 0.75rem 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.25;
  color: var(--fg);
}

.page-about .ab-era__text {
  margin: 0;
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .ab-figure--era img {
  filter: saturate(0.85) contrast(1.05) brightness(0.95);
}

/* ---------- 结尾入口 ---------- */
.page-about .ab-cta {
  margin-top: clamp(2rem, 5vw, 3.25rem);
  padding: clamp(1.4rem, 4vw, 2.4rem);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(255, 90, 54, 0.22), transparent 58%),
    var(--c-carbon);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--c-ember);
  min-width: 0;
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-4);
  line-height: 1.15;
  color: var(--fg);
  max-width: 24ch;
}

.page-about .ab-cta__lead {
  margin: 0.7rem 0 0;
  font-size: var(--step-2);
  line-height: 1.75;
  color: var(--fg-muted);
  max-width: 52ch;
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.35rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-layout {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.25rem);
    align-items: start;
  }

  .page-about .ab-toc {
    position: sticky;
    top: 1.5rem;
    border-top: 0;
    border-left: 2px solid var(--line-strong);
    padding: 0 0 0 1rem;
  }

  .page-about .ab-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0.35rem;
  }

  .page-about .ab-toc__list a {
    display: flex;
    width: 100%;
    padding: 0.42rem 0.6rem;
    border-color: transparent;
  }

  .page-about .ab-tagmatrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .ab-partners__count {
    border-bottom: 0;
    border-right: 1px solid var(--line-strong);
    padding: 0 1.25rem 0 0;
  }

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

  .page-about .ab-section__title {
    max-width: 26ch;
  }
}
<<<END>>>