.page-about {
  --about-line: rgba(42, 33, 28, 0.14);
  --about-line-light: rgba(246, 240, 228, 0.24);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .media-frame {
  margin: 0;
  overflow: hidden;
  background: var(--paper-deep);
  border: 1px solid var(--sand);
}

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

.page-about .breadcrumb {
  padding-top: clamp(0.75rem, 2vw, 1.25rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(1.5rem, 3vw, 2.5rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(3rem, 9vw, 7rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin: 0.15em 0 0.35em;
}

.page-about .about-hero__lede {
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 40em;
  margin: 0;
}

.page-about .about-hero__aside {
  display: grid;
  gap: 0.55rem;
  align-content: start;
  margin: 0;
}

.page-about .about-hero__meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--azurite);
  margin: 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--sand);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7.5fr) minmax(0, 3fr);
    gap: 3.5rem;
    align-items: end;
  }
  .page-about .about-hero__aside {
    padding-bottom: 0.6rem;
  }
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  background: var(--paper-deep);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-index__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.4rem;
  padding-block: 0.85rem;
}

.page-about .about-index__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__link {
  display: inline-block;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
  outline: none;
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-section--paper {
  background: var(--paper-deep);
}

.page-about .about-head {
  display: grid;
  gap: 1rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--about-line);
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-head__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ember);
}

.page-about .about-head__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 4.2vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0.3em 0 0;
}

.page-about .about-head__note {
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--ink-soft);
  padding-left: 0.95rem;
  border-left: 2px solid var(--ochre);
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-head {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3.5fr);
    gap: 2.5rem;
    align-items: end;
  }
}

.page-about .about-copy {
  max-width: 42rem;
}

.page-about .about-copy p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

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

/* ---------- 起点 ---------- */
.page-about .origin-layout {
  display: grid;
  gap: 1.75rem;
}

.page-about .origin-figure {
  aspect-ratio: 4 / 3;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

@media (min-width: 900px) {
  .page-about .origin-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 3.5rem;
    align-items: start;
  }
}

/* ---------- 目录沿革 ---------- */
.page-about .catalog-figure {
  aspect-ratio: 16 / 6;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
  clip-path: polygon(0 16px, 16px 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.42rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--sand);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -1.36rem;
  top: 1.15rem;
  width: 0.62rem;
  height: 0.62rem;
  background: var(--ember);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--paper-deep);
}

.page-about .about-timeline__fold {
  background: var(--paper);
  border-left: 3px solid var(--ochre);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-timeline__fold[open] {
  border-left-color: var(--cinnabar);
}

.page-about .about-timeline__fold > summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 2.6rem 0.95rem 1.1rem;
}

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

.page-about .about-timeline__fold > summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  top: 0.82rem;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--azurite);
  transition: transform 0.2s var(--ease);
}

.page-about .about-timeline__fold[open] > summary::after {
  content: "–";
  color: var(--cinnabar);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--azurite);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-timeline__body {
  padding: 0 1.1rem 1.05rem;
}

.page-about .about-timeline__body p {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    padding-left: 2.25rem;
  }
  .page-about .about-timeline__item {
    max-width: 43rem;
  }
  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 3.25rem;
  }
}

/* ---------- 团队 ---------- */
.page-about .team-ledger {
  display: grid;
  gap: 1rem;
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .team-role {
  position: relative;
  padding: 1.15rem 1.15rem 1.35rem;
  background: var(--paper);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .team-role::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--ochre);
}

.page-about .team-role--review::after {
  background: var(--azurite);
}

.page-about .team-role--tech::after {
  background: var(--cinnabar);
}

.page-about .team-role--contact::after {
  background: var(--pine);
}

.page-about .team-role__count {
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin: 0 0 0.35rem;
}

.page-about .team-role__name {
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--ink);
  margin: 0 0 0.45rem;
}

.page-about .team-role__desc {
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--ink-soft);
  margin: 0;
}

@media (min-width: 680px) {
  .page-about .team-ledger {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .team-ledger {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team-review {
  display: grid;
  gap: 1.25rem;
  padding: 1.25rem 0 1.5rem;
  border-top: 1px solid var(--about-line);
}

.page-about .team-review__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
  margin: 0 0 0.5rem;
}

.page-about .team-review__text {
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
  max-width: 40rem;
}

.page-about .review-chain {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 0.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .review-step {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--ink);
}

.page-about .review-step__num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--pine);
  padding: 0.18rem 0.4rem;
}

.page-about .review-step + .review-step::before {
  content: "→";
  color: var(--ember);
  margin-right: 0.15rem;
}

@media (min-width: 860px) {
  .page-about .team-review {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 2.5rem;
    align-items: center;
  }
}

.page-about .team-figure {
  aspect-ratio: 9 / 7;
  margin-top: 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

/* ---------- 服务场景 ---------- */
.page-about .scenario-grid {
  display: grid;
  gap: 1rem;
}

.page-about .scenario {
  padding: 1.25rem 1.25rem 1.45rem;
  background: var(--paper);
  border-left: 3px solid var(--sand);
}

.page-about .scenario:nth-child(1) {
  border-left-color: var(--cinnabar);
}

.page-about .scenario:nth-child(2) {
  border-left-color: var(--azurite);
}

.page-about .scenario:nth-child(3) {
  border-left-color: var(--ochre);
}

.page-about .scenario:nth-child(4) {
  border-left-color: var(--pine);
}

.page-about .scenario h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.38;
  color: var(--ink);
  margin: 0.7rem 0 0.5rem;
}

.page-about .scenario p:last-child {
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--ink-soft);
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }
  .page-about .scenario:nth-child(even) {
    margin-top: 1.75rem;
  }
}

/* ---------- 本地与生态 ---------- */
.page-about .about-local {
  background: var(--pine);
  color: var(--paper);
}

.page-about .about-local .about-head {
  border-top-color: var(--about-line-light);
}

.page-about .about-local .about-head__num {
  color: var(--ochre);
}

.page-about .about-local .about-head__title {
  color: var(--paper);
}

.page-about .about-local .about-head__note {
  color: rgba(246, 240, 228, 0.78);
  border-left-color: var(--ochre);
}

.page-about .local-layout {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-local .about-copy p {
  color: rgba(246, 240, 228, 0.82);
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--about-line-light);
}

.page-about .eco-item:first-child {
  padding-top: 0;
}

.page-about .eco-item__num {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--ochre);
  letter-spacing: -0.02em;
}

.page-about .eco-item__text {
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(246, 240, 228, 0.82);
}

@media (min-width: 860px) {
  .page-about .local-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 3.5rem;
    align-items: start;
  }
}

/* ---------- 信任与荣誉 ---------- */
.page-about .about-honor {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-honor .about-head {
  border-top-color: var(--about-line-light);
}

.page-about .about-honor .about-head__num {
  color: var(--ember);
}

.page-about .about-honor .about-head__title {
  color: var(--paper);
}

.page-about .about-honor .about-head__note {
  color: rgba(246, 240, 228, 0.72);
  border-left-color: var(--ochre);
}

.page-about .honor-grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .honor-item {
  padding-top: 1rem;
  border-top: 1px solid var(--about-line-light);
}

.page-about .honor-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ochre);
  margin: 0;
}

.page-about .honor-unit {
  font-family: var(--font-body);
  font-size: 0.8rem;
  letter-spacing: 0;
  color: rgba(246, 240, 228, 0.68);
  margin-left: 0.25rem;
}

.page-about .honor-label {
  font-size: 0.84rem;
  line-height: 1.7;
  color: rgba(246, 240, 228, 0.76);
  margin: 0.65rem 0 0;
}

@media (min-width: 700px) {
  .page-about .honor-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }
}

@media (min-width: 1080px) {
  .page-about .honor-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .honor-note {
  margin-top: 1.75rem;
  padding: 1rem 1.15rem;
  background: rgba(246, 240, 228, 0.06);
  border-left: 2px solid var(--sand);
}

.page-about .honor-note p {
  font-size: 0.88rem;
  line-height: 1.78;
  color: rgba(246, 240, 228, 0.78);
  margin: 0;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.page-about .about-cta .btn--ghost {
  border-color: rgba(246, 240, 228, 0.45);
  color: var(--paper);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--ochre);
  color: var(--ochre);
}

.page-about .about-cta .btn--quiet {
  color: rgba(246, 240, 228, 0.72);
}

.page-about .about-cta .btn--quiet:hover,
.page-about .about-cta .btn--quiet:focus-visible {
  color: var(--ochre);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-timeline__fold,
  .page-about .about-timeline__fold > summary::after {
    transition: none;
  }
}
<<<END>>>