.page-about {
  --about-rail: 116px;
}

.page-about .about-crumbs {
  padding: 28px 0 0;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--steel);
}

.page-about .breadcrumbs__link {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumbs__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--line);
}

.page-about .breadcrumbs__current {
  color: var(--archive);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: 32px 0 56px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(60, 232, 206, .10), transparent 58%),
    var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__title {
  margin: 16px 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 8vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
  display: block;
}

.page-about .about-hero__lede {
  max-width: 52ch;
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.8;
  color: var(--paper);
  opacity: .86;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__aside {
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.page-about .about-aside__label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--steel);
}

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

.page-about .about-scale__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  text-decoration: none;
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-scale__link:hover,
.page-about .about-scale__link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.page-about .about-scale__mark {
  flex: 0 0 auto;
  min-width: 52px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .about-scale__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

.page-about .about-scale__link:hover .about-scale__label {
  color: var(--paper);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-body {
  padding: 0 0 80px;
  background: var(--ink);
}

.page-about .about-body > .container {
  max-width: 1180px;
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  padding: 44px 0 44px 20px;
  border-left: 1px solid var(--line);
  scroll-margin-top: 120px;
}

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 48px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  border: 1.5px solid var(--cyan);
}

.page-about .about-chapter__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-deep);
  background: var(--archive);
  padding: 3px 10px;
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-prose p {
  max-width: 62ch;
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--paper);
  opacity: .88;
}

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

.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-note {
  max-width: 62ch;
  margin: 26px 0 0;
  padding: 14px 0 0;
  border-top: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 图片位 ---------- */

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

.page-about .about-figure .figure__frame {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .about-figure .figure__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}

.page-about .about-figure .figure__frame--tall {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--inline,
.page-about .about-figure--banner {
  margin-top: 30px;
}

.page-about .about-figure .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 规模数字墙 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  padding: 20px 18px 22px;
  background: var(--ink-deep);
}

.page-about .about-metric__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.7rem, 6vw, 2.5rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .about-metric__unit {
  margin-left: 2px;
  font-size: .42em;
  font-weight: 500;
  color: var(--archive);
}

.page-about .about-metric__label {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-metric__desc {
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 五步流程 ---------- */

.page-about .about-steps {
  margin-top: 8px;
  border-top: 1px solid var(--line);
}

.page-about .about-step {
  border-bottom: 1px solid var(--line);
}

.page-about .about-step__summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  transition: background .2s var(--ease);
}

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

.page-about .about-step__summary:hover {
  background: rgba(60, 232, 206, .06);
}

.page-about .about-step__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  border: 1px solid var(--line);
  padding: 3px 7px;
}

.page-about .about-step__title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-step__hint {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--steel);
}

.page-about .about-step[open] .about-step__hint {
  color: var(--orange);
}

.page-about .about-step[open] .about-step__title {
  color: var(--cyan);
}

.page-about .about-step__body {
  max-width: 60ch;
  margin: 0;
  padding: 0 0 20px 44px;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__card {
  padding: 22px 20px 24px;
  background: var(--lift);
  transition: background .22s var(--ease), transform .22s var(--ease);
}

.page-about .about-team__card:hover {
  background: var(--ink-deep);
  transform: translateY(-4px);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--archive);
}

.page-about .about-team__role {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team__duty {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
  opacity: .55;
  max-height: 0;
  overflow: hidden;
  transition: opacity .24s var(--ease), max-height .24s var(--ease);
}

.page-about .about-team__card:hover .about-team__duty,
.page-about .about-team__card:focus-within .about-team__duty {
  opacity: 1;
  max-height: 12em;
}

@media (hover: none) {
  .page-about .about-team__duty {
    opacity: 1;
    max-height: none;
  }
}

/* ---------- 使用场景 ---------- */

.page-about .about-scenes {
  display: grid;
  gap: 22px;
  margin-top: 10px;
}

.page-about .about-scene {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: var(--ink-deep);
}

.page-about .about-scene__idx {
  position: absolute;
  top: 18px;
  right: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--line);
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-scene__text {
  margin: 0 0 14px;
  font-size: .94rem;
  line-height: 1.8;
  color: var(--paper);
  opacity: .84;
}

.page-about .about-scene__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, .45);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-scene__link:hover {
  color: var(--archive);
  border-bottom-color: var(--archive);
}

/* ---------- 认可与备案 ---------- */

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

.page-about .about-honor {
  position: relative;
  padding: 14px 0 14px 26px;
  border-bottom: 1px solid var(--line);
  font-size: .94rem;
  line-height: 1.8;
  color: var(--paper);
  opacity: .86;
}

.page-about .about-honor::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 10px;
  height: 2px;
  background: var(--archive);
}

.page-about .about-filing {
  padding: 22px 20px 24px;
  border: 1px solid var(--archive);
  background: rgba(228, 211, 163, .06);
}

.page-about .about-filing__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--archive);
}

.page-about .about-filing__value {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .about-filing__text {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 结尾行动区 ---------- */

.page-about .about-cta {
  margin-top: 20px;
  padding: 34px 24px 38px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cyan);
  background:
    linear-gradient(180deg, rgba(60, 232, 206, .07), transparent 70%),
    var(--ink-deep);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  max-width: 56ch;
  margin: 0 0 24px;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 进入视口 ---------- */

.page-about .about-chapter[data-reveal],
.page-about .about-cta[data-reveal] {
  opacity: 1;
}

.has-js .page-about .about-chapter[data-reveal],
.has-js .page-about .about-cta[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .36s var(--ease), transform .36s var(--ease);
}

.has-js .page-about .about-chapter[data-reveal].is-visible,
.has-js .page-about .about-cta[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 44px 0 68px;
  }

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

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
  }

  .page-about .about-scene {
    border: 0;
    border-top: 3px solid var(--orange);
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

  .page-about .about-split--wide {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  }

  .page-about .about-figure--inline,
  .page-about .about-figure--banner {
    margin-top: 34px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0 36px;
    padding: 56px 0 56px 30px;
  }

  .page-about .about-chapter::before {
    top: 60px;
  }

  .page-about .about-chapter__rail {
    padding-top: 4px;
  }

  .page-about .about-cta {
    padding: 46px 44px 50px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}
<<<END>>>