.page-about {
  --ab-cut: 18px;
  --ab-rail-w: 7.5rem;
  --ab-glow-a: rgba(139, 92, 246, 0.30);
  --ab-glow-b: rgba(244, 114, 182, 0.16);
  background: var(--space-950);
  color: var(--star-white);
  overflow-x: clip;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.45rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--star-white);
  margin: 0.45rem 0 0;
  max-width: 24ch;
  text-wrap: balance;
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--star-white);
  margin: 0 0 0.4rem;
}

.page-about .section-head {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .section-head__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--cyan-gold);
  text-transform: uppercase;
}

.page-about .ab-crumb {
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
}

.page-about .ab-section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2.25rem, 6vw, 4.5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  z-index: -2;
  top: -34%;
  right: -18%;
  width: min(760px, 96vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 55% 45%, var(--ab-glow-a), transparent 58%),
    radial-gradient(circle at 28% 74%, var(--ab-glow-b), transparent 55%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  bottom: -46%;
  left: -24%;
  width: min(600px, 82vw);
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line-blue);
  border-radius: 50%;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.15rem, 6.4vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  margin: 0 0 1.15rem;
  color: var(--star-white);
  text-wrap: balance;
}

.page-about .ab-hero__title span {
  color: var(--cyan-gold);
  display: inline-block;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.78;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .ab-hero__panel {
  padding: clamp(1.15rem, 3vw, 1.85rem);
  background: linear-gradient(158deg, var(--indigo-800) 0%, var(--indigo-900) 100%);
  box-shadow: inset 0 0 0 1px var(--line-blue);
}

.page-about .ab-hero__panel-title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--cyan-gold);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1rem;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  color: var(--star-white);
  line-height: 1.1;
}

.page-about .ab-stat__label {
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.5;
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-origin__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .ab-origin__text p {
  margin: 0 0 1rem;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.82;
}

.page-about .ab-origin__text p:first-child {
  color: var(--star-white);
}

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

.page-about .ab-origin__figure {
  margin: 0;
  align-self: start;
}

/* ---------- 服务原则 ---------- */
.page-about .ab-principles__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.page-about .ab-principle {
  position: relative;
  padding: clamp(1.2rem, 3vw, 1.85rem);
  background: linear-gradient(155deg, var(--indigo-800) 0%, var(--indigo-900) 100%);
  box-shadow: inset 0 0 0 1px var(--line-blue);
  clip-path: polygon(
    0 0,
    calc(100% - var(--ab-cut)) 0,
    100% var(--ab-cut),
    100% 100%,
    var(--ab-cut) 100%,
    0 calc(100% - var(--ab-cut))
  );
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-principle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--cyan-gold);
  opacity: 0.55;
  transition: width var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .ab-principle:hover::before,
.page-about .ab-principle:focus-within::before {
  width: 96px;
  opacity: 1;
}

.page-about .ab-principle:hover,
.page-about .ab-principle:focus-within {
  box-shadow: inset 0 0 0 1px rgba(84, 242, 208, 0.45);
  transform: translateY(-3px);
}

.page-about .ab-principle__idx {
  margin: 0.35rem 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .ab-principle h3 {
  font-size: 1.3rem;
  color: var(--cyan-gold);
  margin-bottom: 0.6rem;
}

.page-about .ab-principle__lead {
  margin: 0 0 0.75rem;
  color: var(--star-white);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .ab-principle__note {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line-blue);
  color: var(--mist);
  font-size: 0.8125rem;
  line-height: 1.7;
  opacity: 0.75;
  transition: opacity var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-principle:hover .ab-principle__note,
.page-about .ab-principle:focus-within .ab-principle__note {
  opacity: 1;
  color: var(--star-white);
}

/* ---------- 分类标签 ---------- */
.page-about .ab-tax__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

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

.page-about .ab-chain {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
}

.page-about .ab-chain__item {
  position: relative;
  padding: 0.85rem 0 0.85rem 3rem;
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-chain__item:last-child {
  border-bottom: 1px solid var(--line-blue);
}

.page-about .ab-chain__idx {
  position: absolute;
  left: 0;
  top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan-gold);
}

.page-about .ab-chain__item h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.page-about .ab-chain__item p {
  margin: 0;
  color: var(--mist);
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .ab-tax__note {
  margin: 0;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: 60ch;
}

/* ---------- 版本演进 ---------- */
.page-about .ab-timeline {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-timeline__rail {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0.35rem;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail__link {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--line-blue);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ink);
  background: var(--cyan-gold);
  border-color: var(--cyan-gold);
}

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

.page-about .ab-ver {
  position: relative;
  display: grid;
  grid-template-columns: 1.5rem minmax(0, 1fr);
  gap: 0.5rem;
}

.page-about .ab-ver::before {
  content: "";
  position: absolute;
  left: calc(0.75rem - 0.5px);
  top: 1.6rem;
  bottom: 0;
  width: 1px;
  background: var(--line-blue);
}

.page-about .ab-ver:last-child::before {
  background: linear-gradient(var(--line-blue), transparent);
}

.page-about .ab-ver::after {
  content: "";
  position: absolute;
  left: calc(0.75rem - 4px);
  top: 1.35rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--space-950);
  box-shadow: 0 0 0 1.5px var(--line-blue);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ab-ver:has(details[open])::after {
  background: var(--cyan-gold);
  box-shadow: 0 0 0 1.5px var(--cyan-gold), 0 0 12px rgba(84, 242, 208, 0.55);
}

.page-about .ab-ver__box {
  grid-column: 2;
  min-width: 0;
}

.page-about .ab-ver__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.75rem;
  padding: 0.85rem 0;
  list-style: none;
  cursor: pointer;
  border-bottom: 1px solid var(--line-blue);
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .ab-ver__head:hover {
  border-bottom-color: rgba(84, 242, 208, 0.5);
}

.page-about .ab-ver__year {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--cyan-gold);
}

.page-about .ab-ver__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--star-white);
}

.page-about .ab-ver__head .tag {
  margin-left: auto;
}

.page-about .ab-ver__body {
  padding: 0.85rem 0 0.35rem;
}

.page-about .ab-ver__body p {
  margin: 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .ab-team__figure {
  margin: 0;
  align-self: start;
}

.page-about .ab-team__lead {
  margin: 0 0 1.4rem;
  max-width: 56ch;
  color: var(--mist);
  line-height: 1.8;
}

.page-about .ab-team__facts {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7.5rem, 1fr));
  gap: 0.85rem;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-fact__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--star-white);
}

.page-about .ab-fact__label {
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .ab-team__note {
  margin: 0 0 1.4rem;
  max-width: 56ch;
  color: var(--mist);
  font-size: 0.875rem;
  line-height: 1.8;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners__panel {
  padding: clamp(1.35rem, 4vw, 2.75rem);
  background:
    radial-gradient(circle at 88% 10%, rgba(139, 92, 246, 0.22), transparent 55%),
    linear-gradient(160deg, var(--indigo-800) 0%, var(--indigo-900) 100%);
  box-shadow: inset 0 0 0 1px var(--line-blue);
}

.page-about .ab-partners__lead {
  margin: 0 0 1.4rem;
  max-width: 62ch;
  color: var(--mist);
  line-height: 1.8;
}

.page-about .ab-partners__list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .ab-partners__list li {
  display: grid;
  grid-template-columns: 0.85rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
  color: var(--star-white);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.page-about .ab-partners__mark {
  width: 0.45rem;
  height: 0.45rem;
  margin-top: 0.55rem;
  background: var(--cyan-gold);
  transform: rotate(45deg);
}

/* ---------- 下一站 ---------- */
.page-about .ab-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-next__link {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  grid-template-areas:
    "idx label"
    "idx desc";
  gap: 0.15rem 0.5rem;
  padding: 1rem 0.25rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line-blue);
  transition: background-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  background: rgba(84, 242, 208, 0.06);
  padding-left: 0.75rem;
}

.page-about .ab-next__idx {
  grid-area: idx;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--cyan-gold);
  padding-top: 0.3rem;
}

.page-about .ab-next__label {
  grid-area: label;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--star-white);
}

.page-about .ab-next__desc {
  grid-area: desc;
  font-size: 0.8125rem;
  color: var(--mist);
  line-height: 1.6;
}

/* ---------- 响应式 ---------- */
@media (min-width: 780px) {
  .page-about .ab-principles__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-timeline {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 3rem);
  }

  .page-about .ab-timeline__rail {
    position: sticky;
    top: 6.5rem;
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0.35rem;
    overflow: visible;
  }

  .page-about .ab-rail__link {
    display: block;
    border: 0;
    border-left: 1px solid var(--line-blue);
    padding: 0.2rem 0 0.2rem 0.75rem;
    background: none;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    color: var(--cyan-gold);
    background: none;
    border-left-color: var(--cyan-gold);
  }
}

@media (min-width: 960px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-tax__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: center;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-principle,
  .page-about .ab-principle::before,
  .page-about .ab-principle__note,
  .page-about .ab-next__link,
  .page-about .ab-ver::after,
  .page-about .ab-rail__link {
    transition: none;
  }

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