.page-about {
  --ab-gap: clamp(3rem, 7vw, 6rem);
  --ab-pad: clamp(1.25rem, 4vw, 3rem);
  display: block;
  background: var(--ink-800);
  color: var(--mist);
}

.page-about .section {
  padding-block: var(--ab-gap);
  border-top: 1px solid var(--line-soft);
}

.page-about .section__eyebrow {
  display: flex;
  align-items: center;
  gap: .625rem;
  font-family: var(--font-head);
  font-size: .8125rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0 0 1rem;
}

.page-about .coord {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--gold);
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
  padding: .125rem .375rem;
}

.page-about .section__title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: .04em;
  color: var(--mist);
  margin: 0;
}

.page-about .section__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--grey);
  margin: 1rem 0 0;
  max-width: 62ch;
}

.page-about .section__head {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 1.75rem;
  max-width: 58ch;
}

.page-about .ab-link {
  font-family: var(--font-head);
  font-size: .9375rem;
  letter-spacing: .04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 2px;
}

.page-about .ab-link:hover {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(5rem, 11vw, 8.5rem) clamp(2.5rem, 6vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(114deg, rgba(20, 30, 74, 0) 40%, rgba(20, 30, 74, .72) 40.2%, rgba(7, 12, 34, .95) 100%),
    radial-gradient(120% 90% at 10% 6%, rgba(63, 191, 160, .16), transparent 56%),
    radial-gradient(90% 80% at 92% 96%, rgba(242, 178, 66, .13), transparent 62%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: stretch;
}

.page-about .ab-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: .625rem;
  font-family: var(--font-head);
  font-size: .8125rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--grey);
  margin: 0 0 1rem;
}

.page-about .ab-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4.2vw, 3.25rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: .04em;
  color: var(--mist);
  margin: 0 0 1.5rem;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.75rem;
}

.page-about .ab-hero__stat {
  background: rgba(11, 18, 48, .9);
  padding: .875rem 1rem 1rem;
}

.page-about .ab-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  line-height: 1.2;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .ab-hero__stat-label {
  display: block;
  margin-top: .375rem;
  font-family: var(--font-head);
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--grey);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .ab-hero__visual {
  margin: 0;
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-700);
  aspect-ratio: 4 / 5;
  max-height: 420px;
}

.page-about .ab-hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 12, 34, 0) 45%, rgba(7, 12, 34, .72) 100%);
  pointer-events: none;
}

.page-about .ab-hero__visual img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 平台在做什么 ---------- */

.page-about .grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.page-about .col-4,
.page-about .col-8 {
  grid-column: span 12;
  min-width: 0;
}

.page-about .ab-what__body p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
  margin: 0 0 1.25rem;
}

.page-about .ab-what__list {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-what__list li {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: .875rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .ab-what__k {
  font-family: var(--font-head);
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--jade);
  padding-top: .2rem;
}

/* ---------- 四条产品线 ---------- */

.page-about .ab-lines {
  padding-block: var(--ab-gap);
  border-top: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(20, 30, 74, .55), rgba(11, 18, 48, 0) 38%);
}

.page-about .ab-lines__head {
  margin-bottom: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .ab-lines__rail {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: .75rem;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-lines__rail::-webkit-scrollbar {
  height: 6px;
}

.page-about .ab-lines__rail::-webkit-scrollbar-track {
  background: rgba(43, 58, 133, .3);
  border-radius: 3px;
}

.page-about .ab-lines__rail::-webkit-scrollbar-thumb {
  background: var(--ink-600);
  border-radius: 3px;
}

.page-about .ab-lines__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 78vw);
  gap: 1rem;
  padding-inline: var(--ab-pad);
  align-items: stretch;
}

.page-about .ab-line {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: .625rem;
  padding: 1.125rem 1.125rem 1.25rem;
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .24s ease, transform .24s ease;
}

.page-about .ab-line:hover {
  border-color: var(--gold-line);
  transform: translateY(-2px);
}

.page-about .ab-line__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--jade);
  margin: 0;
}

.page-about .ab-line__title {
  font-family: var(--font-head);
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--mist);
  margin: 0;
}

.page-about .ab-line__for {
  font-family: var(--font-head);
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--gold-hi);
  margin: 0;
  padding-left: .75rem;
  border-left: 2px solid var(--gold-line);
}

.page-about .ab-line__text {
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--grey);
  margin: 0;
  flex: 1 1 auto;
}

.page-about .ab-line__link {
  align-self: flex-start;
  margin-top: .25rem;
  font-family: var(--font-head);
  font-size: .875rem;
  letter-spacing: .04em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-line);
  padding-bottom: 2px;
}

.page-about .ab-line__link:hover {
  color: var(--gold-hi);
}

.page-about .ab-line--media {
  margin: 0;
  padding: 0;
  overflow: hidden;
  border-color: var(--line);
  background: var(--ink-900);
}

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

/* ---------- 场景摘录 ---------- */

.page-about .ab-quote-band {
  padding-block: clamp(2rem, 5vw, 3.5rem);
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-quote {
  margin: 0;
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--gold);
}

.page-about .ab-quote p {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  line-height: 1.75;
  color: var(--mist);
  max-width: 68ch;
}

/* ---------- 版本档案 ---------- */

.page-about .ab-tl__head {
  margin-bottom: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .ab-tl {
  display: grid;
  gap: .625rem;
}

.page-about .ab-tl__node {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
  transition: border-color .24s ease;
}

.page-about .ab-tl__node:hover {
  border-color: var(--gold-line);
}

.page-about .ab-tl__node[open] {
  border-color: var(--gold-line);
}

.page-about .ab-tl__summary {
  display: grid;
  grid-template-columns: 4.75rem minmax(0, 1fr) 1.75rem;
  align-items: center;
  gap: .75rem;
  padding: 1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__year {
  position: relative;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--gold);
  padding-left: 1rem;
  white-space: nowrap;
}

.page-about .ab-tl__year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -4px;
  border-radius: 50%;
  border: 1.5px solid var(--gold);
  background: var(--ink-800);
}

.page-about .ab-tl__label {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-tl__toggle {
  position: relative;
  width: 1.75rem;
  height: 1.75rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .ab-tl__toggle::before,
.page-about .ab-tl__toggle::after {
  content: "";
  position: absolute;
  background: var(--grey);
}

.page-about .ab-tl__toggle::before {
  left: .375rem;
  right: .375rem;
  top: 50%;
  height: 1.5px;
  margin-top: -.75px;
}

.page-about .ab-tl__toggle::after {
  top: .375rem;
  bottom: .375rem;
  left: 50%;
  width: 1.5px;
  margin-left: -.75px;
  transition: transform .24s ease, opacity .24s ease;
}

.page-about .ab-tl__node[open] .ab-tl__toggle::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-tl__panel {
  padding: 1rem 1rem 1.25rem;
  border-top: 1px dashed var(--line-soft);
}

.page-about .ab-tl__panel p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--grey);
  max-width: 66ch;
}

/* ---------- 团队 ---------- */

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .ab-team__copy p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
  margin: 0 0 1.25rem;
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px;
  margin: 1.75rem 0 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-team__stat {
  background: var(--ink-700);
  padding: 1rem 1.125rem 1.125rem;
}

.page-about .ab-team__stat dt {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  line-height: 1.15;
  color: var(--jade);
  letter-spacing: .01em;
}

.page-about .ab-team__stat dd {
  margin: .5rem 0 0;
  font-family: var(--font-head);
  font-size: .8125rem;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--grey);
}

.page-about .ab-team__media {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1000 / 667;
  object-fit: cover;
}

/* ---------- 服务流程 ---------- */

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-flow__step {
  background: var(--ink-800);
  padding: 1.25rem 1.125rem 1.5rem;
}

.page-about .ab-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: .75rem;
}

.page-about .ab-flow__step h3 {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--mist);
  margin: 0 0 .5rem;
}

.page-about .ab-flow__step p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .875rem;
  line-height: 1.75;
  color: var(--grey);
}

/* ---------- 长期运行 ---------- */

.page-about .ab-trust__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .ab-trust__copy p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--grey);
  margin: 0 0 1.25rem;
}

.page-about .ab-trust__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-trust__list li {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: .75rem;
  align-items: baseline;
  padding: .875rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-body);
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-trust__n {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--jade);
}

.page-about .ab-trust__more {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1.75rem 0 0;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  background:
    linear-gradient(135deg, rgba(242, 178, 66, .12), rgba(30, 122, 102, .16)),
    var(--ink-900);
  border-top: 1px solid var(--gold-line);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 1.75rem;
  align-items: center;
}

.page-about .ab-cta__title {
  font-family: var(--font-head);
  font-size: clamp(1.375rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.35;
  color: var(--mist);
  margin: 0 0 .875rem;
}

.page-about .ab-cta__text {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--grey);
  max-width: 62ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-lines__track {
    grid-auto-columns: minmax(17rem, 20rem);
  }
}

@media (min-width: 900px) {
  .page-about .col-4 {
    grid-column: span 4;
  }

  .page-about .col-8 {
    grid-column: span 8;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .58fr);
    align-items: center;
  }

  .page-about .ab-hero__visual {
    aspect-ratio: 3 / 4;
    max-height: 30rem;
  }

  .page-about .ab-tl__panel {
    padding-left: calc(1rem + 4.75rem + .75rem);
  }

  .page-about .ab-tl__node:nth-child(2) {
    margin-inline-start: 3%;
  }

  .page-about .ab-tl__node:nth-child(3) {
    margin-inline-start: 6%;
  }

  .page-about .ab-tl__node:nth-child(4) {
    margin-inline-start: 9%;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1280px) {
  .page-about .ab-lines__track {
    padding-inline: max(1.25rem, calc((100vw - var(--shell)) / 2));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line,
  .page-about .ab-tl__node,
  .page-about .ab-tl__toggle::after {
    transition: none;
  }

  .page-about .ab-line:hover {
    transform: none;
  }
}