.page-about {
  --about-gap: 48px;
  background: var(--paper);
  color: var(--ink);
  padding-bottom: 72px;
}

/* 面包屑与首屏 */
.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .breadcrumb__list a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--accent-deep);
  border-bottom-color: var(--accent);
}

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

.page-about .about-hero {
  position: relative;
  padding: 38px 0 52px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -80px;
  right: -100px;
  width: 260px;
  height: 260px;
  background: linear-gradient(140deg, var(--accent-tint), transparent 72%);
  border-radius: var(--radius-md);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--accent-deep);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 6.6vw, 50px);
  line-height: 1.26;
  letter-spacing: 0;
  max-width: 17em;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
  max-width: 38em;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 16px;
  background: var(--surface);
}

.page-about .hero-facts__num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--accent-deep);
}

.page-about .hero-facts__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--rock);
}

/* 章节骨架 */
.page-about .chapter {
  padding: var(--about-gap) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .chapter--next {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  background: var(--accent-tint);
  border: 1px solid var(--accent);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 5.2vw, 33px);
  line-height: 1.35;
}

.page-about .chapter__lead {
  margin: 0 0 26px;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--rock);
}

/* 品牌起点 */
.page-about .story-figure {
  margin: 0 0 26px;
}

.page-about .story-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--frost);
}

.page-about .story-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .story-copy p {
  margin: 0;
  line-height: 1.9;
}

.page-about .story-copy p:first-child {
  font-family: var(--font-serif);
  font-size: 17.5px;
  color: var(--ink);
}

.page-about .story-copy p + p {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--rock);
}

/* 四季 × 五栏矩阵 */
.page-about .matrix-scroll {
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-about .matrix {
  display: grid;
  grid-template-columns: 62px repeat(5, minmax(126px, 1fr));
  gap: 1px;
  min-width: 720px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .matrix__corner,
.page-about .matrix__col {
  display: flex;
  align-items: center;
  padding: 10px 8px;
  background: var(--frost);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

.page-about .matrix__corner {
  justify-content: center;
  color: var(--ink);
}

.page-about .matrix__row {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 4px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  color: #ffffff;
}

.page-about .matrix__row--spring {
  background: var(--moss);
}

.page-about .matrix__row--summer {
  background: var(--lake);
}

.page-about .matrix__row--autumn {
  background: var(--clay);
}

.page-about .matrix__row--winter {
  background: var(--indigo);
}

.page-about .matrix__cell {
  padding: 12px 10px;
  background: var(--surface);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--rock);
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .matrix__cell:hover {
  background: var(--frost);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.page-about .matrix__note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  font-size: 13px;
  line-height: 1.8;
  color: var(--rock);
}

/* 审校流程 */
.page-about .split {
  display: grid;
  gap: 26px;
}

.page-about .steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .steps__item {
  position: relative;
  padding: 0 0 22px 46px;
}

.page-about .steps__item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

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

.page-about .steps__item:last-child::before {
  display: none;
}

.page-about .steps__num {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-tint);
  border: 1px solid var(--accent);
  color: var(--accent-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .steps h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .steps p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .split__aside {
  margin: 0;
}

.page-about .split__aside img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--frost);
}

.page-about .split__aside figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .team-panel {
  margin-top: 28px;
  padding: 22px 18px;
  background: var(--frost);
  border-radius: var(--radius-md);
}

.page-about .team-panel__lead {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .team-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 11px;
  border-left: 2px solid var(--accent);
}

.page-about .team-list strong {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.1;
  color: var(--accent-deep);
}

.page-about .team-list span {
  font-size: 13px;
  color: var(--rock);
}

/* 服务规模与合作 */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat-card {
  padding: 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.page-about .stat-card--lead {
  grid-column: 1 / -1;
  background: var(--accent);
  border-color: var(--accent);
}

.page-about .stat-card__num {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--accent-deep);
}

.page-about .stat-card--lead .stat-card__num {
  color: #ffffff;
}

.page-about .stat-card__num small {
  margin-left: 3px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
}

.page-about .stat-card__label {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .stat-card--lead .stat-card__label {
  color: rgba(255, 255, 255, 0.9);
}

.page-about .coop {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .coop__item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .coop__item summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  font-size: 14.5px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: background 0.18s ease;
}

.page-about .coop__item summary::-webkit-details-marker {
  display: none;
}

.page-about .coop__item summary:hover,
.page-about .coop__item summary:focus-visible {
  background: var(--accent-tint);
  outline: none;
}

.page-about .coop__count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
}

.page-about .coop__sign {
  position: relative;
  margin-left: auto;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.page-about .coop__sign::before,
.page-about .coop__sign::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 0;
  width: 12px;
  height: 1px;
  background: var(--accent-deep);
  transition: transform 0.2s ease;
}

.page-about .coop__sign::after {
  transform: rotate(90deg);
}

.page-about .coop__item[open] .coop__sign::after {
  transform: rotate(0deg);
}

.page-about .coop__item p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .scale-figure {
  margin: 26px 0 0;
}

.page-about .scale-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--frost);
}

.page-about .scale-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* 发展节点 */
.page-about .journey {
  display: grid;
  gap: 22px;
}

.page-about .journey__entries {
  display: grid;
  gap: 16px;
}

.page-about .journey__entry {
  padding: 16px 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  scroll-margin-top: 96px;
}

.page-about .journey__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
}

.page-about .journey__entry h3 {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
}

.page-about .journey__entry p:not(.journey__year) {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .journey__rail {
  order: -1;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .journey__rail a {
  flex: 0 0 auto;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--rock);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.page-about .journey__rail a:hover,
.page-about .journey__rail a:focus-visible {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
  outline: none;
}

/* 下一步入口 */
.page-about .next-links {
  display: grid;
  gap: 12px;
}

.page-about .next-links a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px;
  text-decoration: none;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  border-color: var(--accent);
  background: var(--accent-tint);
  transform: translateY(-2px);
  outline: none;
}

.page-about .next-links em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
}

.page-about .next-links strong {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
}

.page-about .next-links span {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--rock);
}

/* 桌面端 */
@media (min-width: 860px) {
  .page-about {
    --about-gap: 72px;
    padding-bottom: 96px;
  }

  .page-about .about-crumb {
    padding-top: 30px;
  }

  .page-about .about-hero {
    padding: 52px 0 64px;
  }

  .page-about .about-hero::after {
    top: -110px;
    right: -60px;
    width: 400px;
    height: 400px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 38px;
  }

  .page-about .hero-facts__num {
    font-size: 28px;
  }

  .page-about .chapter__head {
    gap: 16px;
    margin-bottom: 22px;
  }

  .page-about .chapter__lead {
    font-size: 16px;
    margin-bottom: 32px;
  }

  .page-about .story-figure {
    margin-bottom: 32px;
  }

  .page-about .story-copy {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .story-copy p:first-child {
    font-size: 19px;
    line-height: 1.85;
  }

  .page-about .story-copy p + p {
    margin-top: 16px;
  }

  .page-about .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-panel {
    padding: 26px 28px;
    margin-top: 32px;
  }

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

  .page-about .stat-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .stat-card--lead {
    grid-column: span 3;
    padding: 26px 28px;
  }

  .page-about .stat-card--lead .stat-card__num {
    font-size: 46px;
  }

  .page-about .stat-card--lead .stat-card__label {
    font-size: 15px;
  }

  .page-about .coop {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    gap: 14px;
    margin-top: 24px;
  }

  .page-about .journey {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .journey__rail {
    order: 0;
    position: sticky;
    top: 104px;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .journey__rail a {
    padding: 9px 0 9px 16px;
    margin-left: -1px;
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    letter-spacing: 0.14em;
  }

  .page-about .journey__rail a:hover,
  .page-about .journey__rail a:focus-visible {
    color: var(--accent-deep);
    background: var(--accent-tint);
    border-left-color: var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  }

  .page-about .next-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-links a:hover,
  .page-about .next-links a:focus-visible {
    transform: none;
  }

  .page-about .coop__sign::before,
  .page-about .coop__sign::after {
    transition: none;
  }
}
<<<END>>>