.page-about {
  --ab-rail: 7.5rem;
  --ab-rule: rgba(10, 27, 46, 0.16);
  --ab-shadow: 8px 8px 0 var(--space);
}

/* ============ 面包屑 ============ */
.page-about .ab-crumbbar {
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
  padding-bottom: 0.5rem;
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(158deg, var(--deepice) 0%, var(--space) 58%, #071322 100%);
  color: var(--snow);
  border-bottom: var(--bw) solid var(--space);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(115deg, transparent 48%, rgba(143, 216, 255, 0.13) 49%, transparent 50.5%),
    linear-gradient(-68deg, transparent 60%, rgba(94, 234, 212, 0.1) 61%, transparent 62.5%),
    linear-gradient(180deg, transparent 96%, rgba(143, 216, 255, 0.08) 100%);
  background-size: 230px 230px, 360px 360px, 100% 64px;
}

.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
}

.page-about .ab-hero__copy {
  min-width: 0;
}

.page-about .ab-hero__title {
  margin: 0.4rem 0 0;
  font-size: clamp(2.1rem, 6.2vw, 3.75rem);
  line-height: 1.12;
  letter-spacing: 0.03em;
  color: var(--snow);
}

.page-about .ab-hero__lead {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 2.1vw, 1.125rem);
  line-height: 1.85;
  color: rgba(247, 251, 255, 0.86);
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.1rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  border-top: 1px solid rgba(143, 216, 255, 0.28);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--aurora);
  line-height: 1.1;
}

.page-about .ab-stat__label {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: rgba(247, 251, 255, 0.7);
}

.page-about .ab-hero__actions {
  margin: 1.9rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.page-about .ab-hero__figure {
  margin: 0;
  border: var(--bw) solid var(--ice);
  box-shadow: 10px 10px 0 var(--orange);
  background: var(--space);
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .ab-hero__caption {
  padding: 0.7rem 0.9rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(247, 251, 255, 0.78);
  border-top: 1px solid rgba(143, 216, 255, 0.3);
}

/* ============ 章节锚点条 ============ */
.page-about .ab-anchors {
  background: var(--space);
  border-bottom: var(--bw) solid var(--deepice);
}

.page-about .ab-anchors__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.25rem;
  padding-block: 0.85rem;
}

.page-about .ab-anchors__label {
  color: var(--aurora);
  flex: 0 0 auto;
}

.page-about .ab-anchors__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}

.page-about .ab-anchors__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  color: var(--snow);
  font-size: 0.875rem;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .ab-anchors__list a:hover,
.page-about .ab-anchors__list a:focus-visible {
  color: var(--ice);
  border-bottom-color: var(--orange);
}

.page-about .ab-anchors__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--orange);
  letter-spacing: 0.05em;
}

/* ============ 通用区块 ============ */
.page-about .ab-section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .ab-paper {
  background: var(--paper);
  border-top: var(--bw) solid var(--space);
  border-bottom: var(--bw) solid var(--space);
}

.page-about .ab-section__head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .ab-section__head h2 {
  margin: 0.35rem 0 0;
  font-size: clamp(1.55rem, 3.6vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--space);
}

.page-about .ab-section__head .section__note {
  margin: 0.85rem 0 0;
  color: var(--char);
  line-height: 1.85;
}

/* ============ 起源 ============ */
.page-about .ab-origin {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .ab-origin__body h2 {
  margin: 0.35rem 0 1rem;
  font-size: clamp(1.6rem, 3.8vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--space);
}

.page-about .ab-origin__body p {
  margin: 0 0 1.05rem;
  line-height: 1.9;
  color: var(--char);
}

.page-about .ab-origin__aside {
  border: var(--bw) solid var(--space);
  background: var(--snow);
  box-shadow: var(--ab-shadow);
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
  align-self: start;
}

.page-about .ab-dossier__title {
  margin: 0 0 1rem;
  padding-bottom: 0.7rem;
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--deepice);
  border-bottom: 2px solid var(--silver);
}

.page-about .ab-dossier {
  margin: 0;
}

.page-about .ab-dossier__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.15rem;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--silver);
}

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

.page-about .ab-dossier__key {
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--char);
}

.page-about .ab-dossier__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--space);
  overflow-wrap: anywhere;
}

/* ============ 时间线 ============ */
.page-about .ab-timeline-section {
  background:
    linear-gradient(180deg, var(--snow) 0%, var(--snow) 100%);
}

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

.page-about .ab-tl__item {
  display: grid;
  gap: 0.6rem;
  min-width: 0;
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
  align-self: start;
}

.page-about .ab-tl__card {
  border: var(--bw) solid var(--space);
  background: var(--snow);
  padding: clamp(1rem, 2.4vw, 1.4rem);
  box-shadow: 6px 6px 0 var(--silver);
}

.page-about .ab-tl__card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  letter-spacing: 0.03em;
  color: var(--space);
}

.page-about .ab-tl__card p {
  margin: 0;
  line-height: 1.85;
  color: var(--char);
  font-size: 0.9375rem;
}

.page-about .ab-tl__media {
  margin: 0.4rem 0;
}

.page-about .ab-tl__media figure {
  margin: 0;
  border: var(--bw) solid var(--space);
  background: var(--space);
}

.page-about .ab-tl__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .ab-tl__media figcaption {
  padding: 0.7rem 0.9rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(247, 251, 255, 0.8);
  border-top: 1px solid rgba(143, 216, 255, 0.28);
}

/* ============ 服务理念 / 筛选 ============ */
.page-about .ab-values-section {
  background: linear-gradient(180deg, var(--ice-soft) 0%, rgba(247, 251, 255, 0.6) 70%, var(--snow) 100%);
  border-bottom: var(--bw) solid var(--space);
}

.page-about .ab-values__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding-bottom: 0.9rem;
  border-bottom: 2px solid var(--silver);
}

.page-about .ab-values__bar .chip {
  border: 2px solid var(--space);
  background: var(--snow);
  color: var(--space);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-values__bar .chip:hover {
  background: var(--ice);
}

.page-about .ab-values__bar .chip[aria-pressed="true"] {
  background: var(--space);
  color: var(--snow);
  border-color: var(--space);
  box-shadow: 3px 3px 0 var(--aurora);
}

.page-about .ab-values__status {
  margin: 0.85rem 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--deepice);
}

.page-about .ab-values__grid {
  display: grid;
  gap: 1rem;
}

.page-about .ab-value {
  position: relative;
  border: var(--bw) solid var(--space);
  background: var(--snow);
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  box-shadow: 6px 6px 0 var(--silver);
  min-width: 0;
}

.page-about .ab-value__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--orange);
  padding-bottom: 0.55rem;
}

.page-about .ab-value h3 {
  margin: 0 0 0.6rem;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
  color: var(--space);
}

.page-about .ab-value p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--char);
}

.page-about .filter-empty {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border: 2px dashed var(--deepice);
  color: var(--deepice);
  font-size: 0.9375rem;
}

/* ============ 团队 ============ */
.page-about .ab-team {
  background: linear-gradient(165deg, var(--space) 0%, var(--deepice) 100%);
  color: var(--snow);
}

.page-about .ab-section__head--dark h2 {
  color: var(--snow);
}

.page-about .ab-section__head--dark .section__note {
  color: rgba(247, 251, 255, 0.78);
}

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

.page-about .ab-team__city {
  border: 2px solid rgba(143, 216, 255, 0.45);
  background: rgba(143, 216, 255, 0.07);
  padding: clamp(1rem, 2.4vw, 1.35rem);
  min-width: 0;
}

.page-about .ab-team__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--aurora);
  margin-bottom: 0.5rem;
}

.page-about .ab-team__city h3 {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  letter-spacing: 0.06em;
  color: var(--snow);
}

.page-about .ab-team__city p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(247, 251, 255, 0.8);
}

.page-about .ab-team__note {
  margin: 1.6rem 0 0;
  padding: 1.1rem 1.25rem;
  border-left: 4px solid var(--orange);
  background: rgba(255, 107, 44, 0.1);
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(247, 251, 255, 0.9);
}

.page-about .ab-team__note a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-mono {
  font-family: var(--font-mono);
  color: var(--aurora);
  overflow-wrap: anywhere;
}

/* ============ 合作生态 ============ */
.page-about .ab-eco {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-eco__body h2 {
  margin: 0.35rem 0 1rem;
  font-size: clamp(1.55rem, 3.6vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: 0.03em;
  color: var(--space);
}

.page-about .ab-eco__body p {
  margin: 0 0 1rem;
  line-height: 1.9;
  color: var(--char);
}

.page-about .ab-eco__stats {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 1.25rem 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem;
  border-top: 2px solid var(--space);
}

.page-about .ab-eco__stats li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .ab-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--orange);
  line-height: 1.1;
}

.page-about .ab-eco__lab {
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--char);
}

.page-about .ab-eco__figure {
  margin: 0;
  border: var(--bw) solid var(--space);
  background: var(--snow);
  box-shadow: var(--ab-shadow);
  align-self: start;
}

.page-about .ab-eco__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .ab-eco__figure figcaption {
  padding: 0.7rem 0.9rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--char);
  border-top: 2px solid var(--space);
}

/* ============ 适合谁 ============ */
.page-about .ab-audience {
  background: var(--snow);
}

.page-about .ab-audience__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  counter-reset: ab-aud;
}

.page-about .ab-audience__item {
  position: relative;
  padding: 1.1rem 1.2rem 1.1rem 1.5rem;
  background: var(--snow);
  border: 2px solid var(--silver);
  border-left: 6px solid var(--ice);
  min-width: 0;
}

.page-about .ab-audience__item:nth-child(even) {
  border-left-color: var(--orange-soft);
}

.page-about .ab-audience__item h3 {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  letter-spacing: 0.05em;
  color: var(--space);
}

.page-about .ab-audience__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--char);
}

/* ============ 下一步 ============ */
.page-about .ab-next {
  background: linear-gradient(150deg, var(--deepice) 0%, var(--space) 100%);
  color: var(--snow);
  border-top: var(--bw) solid var(--space);
}

.page-about .ab-next__inner {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-next__lead h2 {
  margin: 0.35rem 0 0.85rem;
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: 0.03em;
  color: var(--snow);
}

.page-about .ab-next__lead p {
  margin: 0;
  max-width: 52ch;
  line-height: 1.9;
  color: rgba(247, 251, 255, 0.82);
}

.page-about .ab-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .ab-next__card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  border: 2px solid var(--ice);
  background: rgba(143, 216, 255, 0.07);
  color: var(--snow);
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  background: rgba(143, 216, 255, 0.18);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--orange);
}

.page-about .ab-next__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .ab-next__card strong {
  font-size: 1.0625rem;
  letter-spacing: 0.05em;
}

.page-about .ab-next__card span:last-child {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(247, 251, 255, 0.75);
}

/* ============ 响应式 ============ */
@media (min-width: 760px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-timeline {
    position: relative;
  }

  .page-about .ab-timeline::before {
    content: "";
    position: absolute;
    left: calc(var(--ab-rail) - 0.9rem);
    top: 0.6rem;
    bottom: 0.6rem;
    width: 2px;
    background: var(--silver);
  }

  .page-about .ab-tl__item {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 1.75rem;
    align-items: start;
  }

  .page-about .ab-tl__item::before {
    content: "";
    position: absolute;
    left: calc(var(--ab-rail) - 1.15rem);
    width: 12px;
    height: 12px;
    margin-top: 1.15rem;
    background: var(--orange);
    border: 2px solid var(--snow);
    box-shadow: 0 0 0 2px var(--space);
    border-radius: 50%;
    z-index: 1;
  }

  .page-about .ab-tl__item {
    position: relative;
  }

  .page-about .ab-tl__year {
    text-align: right;
    padding-right: 0.35rem;
  }

  .page-about .ab-tl__media {
    grid-column: 1 / -1;
    margin-left: 0;
  }

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

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

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

@media (min-width: 960px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
  }

  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-eco {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

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

@media (min-width: 1080px) {
  .page-about .ab-values__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-next__card {
    transition: none;
  }

  .page-about .ab-next__card:hover,
  .page-about .ab-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>