.page-about {
  background: var(--cream);
  color: var(--ink);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* 首屏 */
.page-about .about-hero {
  padding: clamp(1.5rem, 5vw, 4rem) 0 clamp(2rem, 6vw, 4.5rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-hero__lead h1 {
  margin: 0.5rem 0 1.1rem;
  line-height: 0.94;
}

.page-about .about-hero__lead .lede {
  max-width: 36ch;
}

.page-about .about-kw {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-kw__item {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-kw__item--accent {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  letter-spacing: 0.06em;
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-jump__link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.1rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  color: var(--vermilion);
  border-bottom-color: var(--orange);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  box-shadow: 9px 9px 0 rgba(31, 74, 58, 0.14);
}

.page-about .about-hero__media .media__frame {
  aspect-ratio: 8 / 5;
  overflow: hidden;
}

.page-about .about-hero__media img,
.page-about .about-method__media img,
.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-hero__media .media__caption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--ink-70);
}

/* 左右分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-plate {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  margin: 0 0 0.9rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-plate__no {
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  color: var(--vermilion);
}

.page-about .about-plate__label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-70);
}

.page-about .about-note {
  margin: 0;
  padding-left: 0.9rem;
  border-left: 3px solid var(--orange);
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--ink-70);
  max-width: 32ch;
}

.page-about .about-split__body h2 {
  margin: 0 0 1rem;
}

.page-about .about-split__body p {
  max-width: 44ch;
  margin-bottom: 1rem;
}

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

/* 三步查法 */
.page-about .about-method {
  position: relative;
  overflow: hidden;
}

.page-about .about-method__head {
  max-width: 46rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-method__head h2 {
  margin: 0.5rem 0 0.9rem;
}

.page-about .about-method__head .lede {
  max-width: 40ch;
}

.page-about .about-svg {
  display: block;
  width: 100%;
  height: clamp(60px, 10vw, 110px);
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-method__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-step {
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid var(--line-light);
  background: rgba(247, 238, 221, 0.05);
}

.page-about .about-step__no {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
  color: var(--cyan);
}

.page-about .about-step__title {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--cream-70);
}

.page-about .about-method__media {
  margin: 0;
  align-self: start;
  border: 1px solid var(--line-light);
  background: var(--pine-deep);
}

.page-about .about-method__media .media__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.page-about .about-method__media .media__caption {
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--line-light);
  font-size: 0.8rem;
  color: var(--cream-70);
}

/* 团队 */
.page-about .about-team__stat {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 1.2rem 0 1rem;
}

.page-about .about-team__stat .score {
  font-size: clamp(2.6rem, 7vw, 4rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__stat-label {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--ink-70);
}

.page-about .about-roles {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-role {
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
}

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

.page-about .about-role__title {
  position: relative;
  padding-left: 1.4rem;
  font-size: 1rem;
}

.page-about .about-role__title::before {
  content: "+";
  position: absolute;
  left: 0;
  top: -0.05em;
  font-family: var(--font-mono);
  color: var(--orange);
}

.page-about .about-role[open] .about-role__title::before {
  content: "−";
}

.page-about .about-role__count {
  font-size: 0.85rem;
  color: var(--vermilion);
  white-space: nowrap;
}

.page-about .about-role__body {
  margin: 0;
  padding: 0 1rem 1rem 2.4rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--ink-70);
  max-width: 46ch;
}

/* 发展历程 */
.page-about .about-timeline__head {
  display: grid;
  gap: clamp(1.25rem, 4vw, 2.25rem);
  margin-bottom: clamp(1.75rem, 5vw, 3rem);
}

.page-about .about-timeline__head h2 {
  margin: 0.5rem 0 0.9rem;
}

.page-about .about-timeline__head .lede {
  max-width: 38ch;
}

.page-about .about-timeline__media {
  margin: 0;
  border: 1px solid var(--line-strong);
}

.page-about .about-timeline__media .media__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.page-about .about-timeline__media .media__caption {
  padding: 0.55rem 0.8rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--ink-70);
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 1rem;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-track__item {
  padding-top: 0.9rem;
  border-top: 2px solid var(--line-strong);
}

.page-about .about-track__year {
  display: block;
  font-size: clamp(1.6rem, 4.5vw, 2.4rem);
  line-height: 1;
  color: var(--vermilion);
  letter-spacing: 0.02em;
}

.page-about .about-track__card {
  margin-top: 0.7rem;
  padding: 0.9rem 1rem;
  background: var(--paper);
  border-left: 4px solid var(--orange);
}

.page-about .about-track__title {
  margin: 0 0 0.45rem;
  font-size: 1rem;
}

.page-about .about-track__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-70);
  max-width: 40ch;
}

/* 合作与认可 */
.page-about .about-partner-grid {
  display: grid;
  gap: 0.8rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-partner {
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--line-strong);
  background: var(--paper);
}

.page-about .about-partner__num {
  display: block;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--pine);
}

.page-about .about-partner__label {
  margin: 0.55rem 0 0;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--ink-70);
}

.page-about .about-partner--accent {
  background: var(--pine);
  border-color: var(--pine-deep);
}

.page-about .about-partner--accent .about-partner__num {
  color: var(--cyan);
}

.page-about .about-partner--accent .about-partner__label {
  color: var(--cream-70);
}

.page-about .about-partners__more {
  margin-top: 1.2rem;
  font-size: 0.92rem;
  color: var(--ink-70);
  max-width: 52ch;
}

.page-about .about-partners__more a,
.page-about .about-coverage__item a,
.page-about .about-cta__inner a:not(.btn) {
  color: var(--vermilion);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

/* 覆盖范围 */
.page-about .about-coverage {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-coverage__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-coverage__lead h2 {
  margin: 0.5rem 0 0.9rem;
}

.page-about .about-coverage__lead p {
  max-width: 40ch;
  color: var(--ink-70);
}

.page-about .about-coverage__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-coverage__item {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--amber);
  background: var(--cream);
}

.page-about .about-coverage__k {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--pine);
}

.page-about .about-coverage__v {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink-70);
}

/* 收尾 */
.page-about .about-cta {
  padding: clamp(2rem, 6vw, 4rem) 0 clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.4rem, 4vw, 2.5rem);
  background: var(--pine);
  color: var(--cream);
  border-left: 8px solid var(--orange);
}

.page-about .about-cta__inner h2 {
  margin: 0.5rem 0 0.8rem;
  color: var(--cream);
}

.page-about .about-cta__inner p {
  max-width: 42ch;
  color: var(--cream-70);
}

.page-about .about-cta__inner a:not(.btn) {
  color: var(--cyan);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-start;
}

/* 渐进显现 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 380ms var(--ease), transform 380ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* 窄屏保护 */
.page-about .about-split,
.page-about .about-method__grid,
.page-about .about-coverage__inner,
.page-about .about-timeline__head {
  min-width: 0;
}

.page-about img,
.page-about svg {
  max-width: 100%;
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

/* 桌面 */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
    gap: clamp(2rem, 4vw, 4rem);
  }

  .page-about .about-hero__media {
    margin-bottom: 0.6rem;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 2rem;
    align-self: start;
  }

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
  }

  .page-about .about-timeline__head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-track {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem 2.5rem;
    padding-bottom: 3.5rem;
  }

  .page-about .about-track__item:nth-child(even) {
    transform: translateY(2.25rem);
  }

  .page-about .about-coverage__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

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

@media (min-width: 1180px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
<<<END>>>
```