.page-about {
  --axis-w: 230px;
  --block-gap: clamp(40px, 6vw, 72px);
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px) 0 clamp(32px, 5vw, 56px);
  border-bottom: 2px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(47, 243, 214, 0.14), transparent 62%),
    radial-gradient(90% 70% at 4% 96%, rgba(255, 122, 43, 0.1), transparent 60%),
    repeating-linear-gradient(90deg, rgba(28, 74, 58, 0.5) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: end;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  max-width: 18ch;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 54ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero__stats .stat {
  border-top: 2px solid var(--line);
  padding-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}

.page-about .about-hero__stats .stat--orange .stat__value {
  color: var(--orange);
}

.page-about .about-hero__stats .stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--haze);
}

.page-about .about-hero__fig {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06) brightness(0.86);
}

.page-about .about-hero__fig figcaption {
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dim);
  border-top: 2px solid var(--line);
  background: rgba(6, 17, 13, 0.6);
}

/* ---------- 索引轴 + 内容流 ---------- */
.page-about .about-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(32px, 5vw, 56px);
}

.page-about .about-axis {
  position: sticky;
  top: 62px;
  z-index: 4;
  background: var(--ink-900);
  padding-bottom: 8px;
}

.page-about .about-axis__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .about-axis__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-axis__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  color: var(--haze);
  font-size: 13.5px;
  text-decoration: none;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease),
    background-color var(--speed) var(--ease);
}

.page-about .about-axis__num {
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-axis__link:hover,
.page-about .about-axis__link:focus-visible {
  color: var(--paper);
  border-color: var(--teal);
}

.page-about .about-axis__link.is-current {
  color: var(--paper);
  border-color: var(--orange);
}

.page-about .about-axis__link.is-current .about-axis__num {
  color: var(--orange);
}

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: var(--block-gap);
  min-width: 0;
}

.page-about .about-block {
  scroll-margin-top: 120px;
  border-top: 2px solid var(--line);
  padding-top: clamp(20px, 3vw, 30px);
}

.page-about .about-block h2 {
  margin: 8px 0 0;
  max-width: 22ch;
}

.page-about .about-block__text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--haze);
  max-width: 62ch;
}

.page-about .about-block__text + .about-block__text {
  margin-top: 12px;
}

.page-about .about-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--teal-deep);
  font-size: 14px;
  line-height: 1.8;
  color: var(--dim);
  max-width: 60ch;
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--teal);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid var(--teal-deep);
  padding-bottom: 2px;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

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

/* ---------- 业务范围列表 ---------- */
.page-about .about-index {
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .about-index .index-list__item {
  border-top: 2px solid var(--line);
  padding: 20px 0 22px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
}

.page-about .about-index .index-list__item:last-child {
  border-bottom: 2px solid var(--line);
}

.page-about .about-index .index-list__num {
  grid-row: 1 / span 3;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .about-index .index-list__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.4vw, 22px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-index .index-list__desc {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-index .about-inline-link {
  grid-column: 2;
  justify-self: start;
  margin-top: 4px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 26px;
  border: 2px solid var(--line);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard-sm);
  border-radius: var(--radius);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 18px 20px;
  border-bottom: 2px solid var(--line);
  transition: background-color var(--speed) var(--ease);
}

.page-about .about-team__row:last-child {
  border-bottom: 0;
}

.page-about .about-team__row:hover {
  background: rgba(28, 74, 58, 0.35);
}

.page-about .about-team__head {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-team__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 24px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--teal);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  padding: 2px 8px;
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
  max-width: 60ch;
}

/* ---------- 流程 ---------- */
.page-about .about-process {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  border: 2px solid var(--line);
  border-left: 6px solid var(--teal-deep);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  background: linear-gradient(160deg, rgba(12, 32, 25, 0.95), rgba(6, 17, 13, 0.9));
  transition: border-color var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--teal);
  border-left-color: var(--orange);
  transform: translateX(4px);
}

.page-about .about-step__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-900);
  background: var(--teal);
  border-radius: 2px;
  padding: 2px 8px;
}

.page-about .about-step__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--paper);
}

.page-about .about-step__text {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-step__meta {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
  border-top: 1px dashed var(--line);
  padding-top: 8px;
  transition: color var(--speed) var(--ease);
}

.page-about .about-step:hover .about-step__meta {
  color: var(--orange);
}

.page-about .about-process__fig {
  margin: 0;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-process__fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05) brightness(0.82);
}

.page-about .about-process__fig figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dim);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-block--wide {
  border-top: 2px solid var(--line);
}

.page-about .about-timeline-fig {
  margin: 24px 0 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-timeline-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  filter: saturate(0.9) brightness(0.85);
}

.page-about .about-rail {
  margin-top: 22px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 12px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 4px;
}

.page-about .about-rail__track {
  display: flex;
  gap: 14px;
  width: max-content;
  align-items: flex-start;
  padding-bottom: 4px;
}

.page-about .about-node {
  scroll-snap-align: start;
  width: 232px;
  flex: 0 0 auto;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  position: relative;
  overflow: hidden;
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--teal-deep) 0 8px, transparent 8px 16px);
}

.page-about .about-node:hover {
  border-color: var(--teal);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .about-node__trigger {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  padding: 16px 14px 12px;
  cursor: pointer;
}

.page-about .about-node__trigger:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: -4px;
}

.page-about .about-node__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-node__name {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-node .expand-panel {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows var(--speed) var(--ease);
}

.page-about .about-node[data-open="false"] .expand-panel {
  grid-template-rows: 0fr;
}

.page-about .about-node .expand-panel__inner {
  overflow: hidden;
}

.page-about .about-node__text {
  margin: 0;
  padding: 0 14px 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-node[data-open="true"] {
  border-color: var(--orange);
}

/* ---------- 内容来源 ---------- */
.page-about .about-partners {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-partners__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-partners__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 14px 12px;
  transition: border-color var(--speed) var(--ease);
}

.page-about .about-partners__cell:hover {
  border-color: var(--teal);
}

.page-about .about-partners__k {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
}

.page-about .about-partners__cell:nth-child(2) .about-partners__k {
  color: var(--orange);
}

.page-about .about-partners__v {
  font-size: 13px;
  line-height: 1.6;
  color: var(--haze);
}

/* ---------- 结尾指引 ---------- */
.page-about .about-cta {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(47, 243, 214, 0.14), transparent 58%),
    var(--ink-800);
  padding: clamp(22px, 3.5vw, 34px);
  scroll-margin-top: 120px;
}

.page-about .about-cta h2 {
  margin: 0;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
  max-width: 62ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-index .index-list__item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 6px 16px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-process {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-map {
    grid-template-columns: var(--axis-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-axis {
    top: 96px;
    padding-bottom: 0;
  }

  .page-about .about-axis__list {
    display: block;
    overflow: visible;
    border-left: 2px solid var(--line);
    padding: 4px 0 4px 0;
  }

  .page-about .about-axis__link {
    position: relative;
    display: flex;
    width: 100%;
    border: 0;
    background: transparent;
    border-radius: 0;
    padding: 9px 0 9px 18px;
    font-size: 14px;
  }

  .page-about .about-axis__link::before {
    content: "";
    position: absolute;
    left: -7px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border: 2px solid var(--line);
    background: var(--ink-900);
    border-radius: 50%;
    transition: background-color var(--speed) var(--ease), border-color var(--speed) var(--ease);
  }

  .page-about .about-axis__link:hover::before,
  .page-about .about-axis__link:focus-visible::before {
    border-color: var(--teal);
    background: var(--teal-deep);
  }

  .page-about .about-axis__link.is-current::before {
    border-color: var(--orange);
    background: var(--orange);
  }

  .page-about .about-team__row {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr);
    gap: 4px 24px;
    align-items: start;
  }

  .page-about .about-team__head {
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-team__count {
    align-self: flex-start;
  }

  .page-about .about-node {
    width: 252px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node .expand-panel,
  .page-about .about-step,
  .page-about .about-node,
  .page-about .about-axis__link {
    transition: none;
  }

  .page-about .about-step:hover {
    transform: none;
  }
}
<<<END>>>