.page-about {
  --about-pad: clamp(44px, 7vw, 104px);
  --about-index: 236px;
  --about-muted: rgba(243, 246, 239, 0.74);
  --about-line-soft: rgba(34, 53, 42, 0.65);
  background: var(--ink);
  color: var(--chalk);
  padding-bottom: 0;
}

.page-about .about-crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .breadcrumbs {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .breadcrumbs a {
  color: var(--sage);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--volt);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--chalk);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(28px, 4vw, 56px) 0 clamp(36px, 5vw, 72px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62%;
  height: 170%;
  background: linear-gradient(165deg, var(--turf) 0%, rgba(27, 68, 46, 0) 72%);
  transform: skewX(-9deg);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero-copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 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(--ink);
  padding: 14px 16px;
}

.page-about .about-facts .num {
  display: block;
  font-size: 28px;
  line-height: 1.1;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .about-hero-figure {
  margin: 0;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 10;
}

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

/* ---------- 正文两栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  padding-top: var(--about-pad);
  padding-bottom: var(--about-pad);
}

.page-about .about-aside .eyebrow {
  margin: 0 0 10px;
  color: var(--sage);
}

.page-about .toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  overflow-x: auto;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 13px;
  line-height: 1.4;
  color: var(--sage);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .toc-link .num {
  font-size: 11px;
  color: var(--tactical);
}

.page-about .toc-link:hover {
  color: var(--chalk);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--volt);
  border-left-color: var(--volt);
}

.page-about .toc-link[aria-current="true"] .num {
  color: var(--volt);
}

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: clamp(48px, 7vw, 96px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
}

.page-about .section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 0 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 26px;
}

.page-about .section-head .section-num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--volt);
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .prose {
  max-width: 38em;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-muted);
}

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

/* ---------- 01 阶段列表 ---------- */

.page-about .about-phases {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-phases li {
  background: var(--ink);
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px 24px;
  padding: 20px 0;
}

.page-about .about-phase-year {
  font-size: 20px;
  color: var(--volt);
  letter-spacing: 0.02em;
}

.page-about .about-phases h3 {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-phases p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 02 场景 ---------- */

.page-about .about-scenes {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-scenes li {
  background: var(--turf);
  padding: 20px 18px;
}

.page-about .about-scene-num {
  display: inline-block;
  font-size: 12px;
  color: var(--volt);
  letter-spacing: 0.16em;
}

.page-about .about-scenes h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--chalk);
}

.page-about .about-scenes p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(243, 246, 239, 0.8);
}

/* ---------- 03 方法与步骤 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .about-method-figure {
  margin: 0;
  border: 1px solid var(--line);
  aspect-ratio: 4 / 3;
}

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

.page-about .about-steps {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
}

.page-about .about-steps li {
  background: var(--ink);
  border-top: 1px solid var(--line);
  padding: 18px 0 6px;
}

.page-about .about-steps .num {
  font-size: 12px;
  color: var(--tactical);
  letter-spacing: 0.12em;
}

.page-about .about-steps h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--chalk);
}

.page-about .about-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-muted);
}

/* ---------- 04 团队（浅色说明牌区） ---------- */

.page-about .about-paper {
  background: var(--paper);
  color: var(--carbon);
  padding: clamp(22px, 3.4vw, 40px);
  border-left: 4px solid var(--volt);
}

.page-about .about-paper-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(17, 21, 18, 0.16);
}

.page-about .about-paper-head .eyebrow {
  margin: 0 0 8px;
  color: var(--tactical);
}

.page-about .about-paper-head h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.2;
  color: var(--carbon);
}

.page-about .about-paper-head p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(17, 21, 18, 0.78);
}

.page-about .about-crew-figure {
  margin: 0;
  border: 1px solid rgba(17, 21, 18, 0.2);
  aspect-ratio: 4 / 3;
}

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

.page-about .about-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(17, 21, 18, 0.14);
}

.page-about .about-crew li {
  background: var(--paper);
  padding: 20px 4px 18px;
  border-top: 1px solid rgba(17, 21, 18, 0.16);
}

.page-about .about-crew-num {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--tactical);
}

.page-about .about-crew h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--carbon);
}

.page-about .about-crew p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(17, 21, 18, 0.78);
}

/* ---------- 05 合作 ---------- */

.page-about .about-partners {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
}

.page-about .about-partners li {
  background: var(--ink);
  padding: 22px 0 18px;
  border-top: 1px solid var(--line);
}

.page-about .about-partner-num {
  display: block;
  font-size: 38px;
  line-height: 1;
  color: var(--volt);
}

.page-about .about-partners h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--chalk);
}

.page-about .about-partners p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-muted);
}

/* ---------- 06 横向时间轴 ---------- */

.page-about .about-timeline-wrap {
  margin-top: 30px;
  border-top: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 18px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(190px, 1fr);
  scroll-snap-type: x mandatory;
}

.page-about .about-milestone {
  position: relative;
  scroll-snap-align: start;
  padding: 30px 22px 6px 0;
  border-right: 1px solid var(--line);
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 14px;
  background: var(--tactical);
}

.page-about .about-ms-year {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-milestone p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .about-milestone--now::before {
  background: var(--volt);
}

.page-about .about-milestone--now .about-ms-year {
  color: var(--volt);
}

/* ---------- CTA ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: linear-gradient(118deg, var(--turf) 0%, var(--ink) 68%);
  padding: clamp(40px, 6vw, 80px) 0;
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: end;
}

.page-about .about-cta-copy .eyebrow {
  margin: 0 0 10px;
  color: var(--volt);
}

.page-about .about-cta-copy h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.1;
  color: var(--chalk);
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta-actions .btn {
  text-decoration: none;
  white-space: nowrap;
}

/* ---------- 断点 ---------- */

@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
    background: none;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 24px;
    background: none;
  }

  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
    background: none;
  }
}

@media (min-width: 760px) {
  .page-about .about-phases li {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-paper-head {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }

  .page-about .about-cta-inner {
    grid-template-columns: 1.4fr 0.6fr;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero-grid {
    grid-template-columns: 1.12fr 0.88fr;
  }

  .page-about .about-split {
    grid-template-columns: 1.05fr 0.95fr;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .toc {
    overflow-x: visible;
    padding-top: 14px;
  }

  .page-about .about-timeline {
    grid-auto-columns: minmax(210px, 1fr);
  }
}

已在上方输出，无需重复。

.page-about {
  --line-soft: transparent;
}