.page-about {
  --ab-line: rgba(201, 233, 230, .14);
  --ab-line-strong: rgba(201, 233, 230, .22);
  --ab-cy-soft: rgba(22, 224, 210, .2);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: var(--sp-3);
  margin-bottom: var(--sp-4);
}

/* ---------- 共享图形容器 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-ink-2);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: var(--sp-4);
  padding-bottom: var(--sp-6);
}

.page-about .ab-hero__frame {
  position: relative;
  padding: var(--sp-5) var(--sp-4) var(--sp-5);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(130% 120% at 100% 0%, rgba(58, 46, 110, .62) 0%, rgba(58, 46, 110, 0) 58%),
    radial-gradient(90% 100% at 0% 100%, rgba(22, 224, 210, .12) 0%, rgba(22, 224, 210, 0) 62%),
    linear-gradient(180deg, var(--c-ink-2) 0%, var(--c-ink) 100%);
  overflow: hidden;
}

.page-about .ab-hero__frame::before,
.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  width: 42px;
  height: 42px;
  border: 2px solid var(--c-cyan);
  opacity: .5;
  pointer-events: none;
}

.page-about .ab-hero__frame::before {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .ab-hero__frame::after {
  right: 12px;
  bottom: 12px;
  border-left: 0;
  border-top: 0;
}

.page-about .ab-hero__title {
  margin: var(--sp-3) 0 var(--sp-3);
  font-family: var(--font-display);
  font-size: clamp(30px, 8.6vw, 60px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .01em;
  color: var(--c-white);
}

.page-about .ab-hero__lede {
  max-width: 64ch;
  margin: 0;
  color: var(--c-mist);
  font-size: var(--fs-3);
  line-height: 1.68;
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

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

.page-about .ab-stat {
  padding: var(--sp-3);
  background: var(--c-ink);
}

.page-about .ab-stat__label {
  margin: 0;
  font-size: var(--fs-1);
  letter-spacing: .12em;
  color: var(--c-slate);
}

.page-about .ab-stat__value {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--c-lime);
}

/* ---------- 运营脉络 ---------- */
.page-about .ab-story__head {
  display: grid;
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
}

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

.page-about .ab-lead {
  margin: var(--sp-3) 0 0;
  max-width: 68ch;
  font-size: var(--fs-3);
  line-height: 1.68;
  color: var(--c-mist);
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, rgba(22, 224, 210, .3) 58%, rgba(22, 224, 210, 0) 100%);
}

.page-about .ab-node {
  position: relative;
  padding-bottom: var(--sp-5);
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 2px solid rgba(22, 224, 210, .45);
  transition: border-color .3s ease, box-shadow .3s ease;
}

.page-about .ab-node.is-visible::before {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(22, 224, 210, .12);
}

.page-about .ab-node__mark {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  line-height: 1;
  letter-spacing: .05em;
  color: var(--c-lime);
}

.page-about .ab-node__title {
  margin: 0 0 8px;
  font-size: var(--fs-4);
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-white);
}

.page-about .ab-node__desc {
  margin: 0;
  max-width: 66ch;
  font-size: var(--fs-3);
  line-height: 1.64;
  color: var(--c-slate);
}

/* ---------- 数据工序 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: var(--sp-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-flow__step {
  position: relative;
  padding: var(--sp-4);
  border: 1px solid rgba(201, 233, 230, .18);
  border-radius: var(--radius-lg);
  background: rgba(7, 9, 13, .45);
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--sp-4);
  width: 42px;
  height: 3px;
  background: var(--c-cyan);
}

.page-about .ab-flow__idx {
  display: block;
  padding-top: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .2em;
  color: var(--c-cyan);
}

.page-about .ab-flow__time {
  display: inline-block;
  margin: var(--sp-2) 0 0;
  padding: 3px 9px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .04em;
  color: var(--c-ink);
  background: var(--c-lime);
}

.page-about .ab-flow__title {
  margin: var(--sp-3) 0 8px;
  font-size: var(--fs-4);
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-white);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.64;
  color: var(--c-mist);
}

.page-about .ab-flow__note {
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4);
  border-left: 2px solid var(--c-lime);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  background: rgba(7, 9, 13, .45);
  font-size: var(--fs-3);
  line-height: 1.62;
  color: var(--c-mist);
}

/* ---------- 版本刻度 ---------- */
.page-about .ab-vers__figure {
  margin: 0 0 var(--sp-5);
}

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

.page-about .ab-ver {
  position: relative;
  padding: 0 0 var(--sp-4) var(--sp-4);
  border-left: 1px solid var(--ab-cy-soft);
}

.page-about .ab-ver:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-ver::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 2px solid rgba(22, 224, 210, .45);
  transition: border-color .3s ease, box-shadow .3s ease;
}

.page-about .ab-ver.is-visible::before {
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(22, 224, 210, .12);
}

.page-about .ab-ver__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: .18em;
  color: var(--c-cyan);
}

.page-about .ab-ver__name {
  margin: 6px 0 6px;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .ab-ver__desc {
  margin: 0;
  font-size: var(--fs-2);
  line-height: 1.6;
  color: var(--c-slate);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: var(--sp-5);
}

.page-about .ab-role {
  padding-top: var(--sp-4);
  border-top: 2px solid var(--c-cyan);
}

.page-about .ab-role__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(52px, 15vw, 84px);
  font-weight: 700;
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--c-lime);
}

.page-about .ab-role__name {
  margin: var(--sp-3) 0 var(--sp-2);
  font-size: var(--fs-4);
  font-weight: 700;
  color: var(--c-white);
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.64;
  color: var(--c-slate);
}

.page-about .ab-role--note {
  border-top-color: rgba(201, 233, 230, .32);
}

.page-about .ab-role--note .ab-role__name {
  margin-top: 0;
}

.page-about .ab-role--note .ab-role__desc {
  margin-bottom: var(--sp-3);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .ab-partner {
  padding: var(--sp-4);
  background: var(--c-ink);
}

.page-about .ab-partner__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-5);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-cyan);
}

.page-about .ab-partner__no span {
  margin-left: 4px;
  font-size: var(--fs-2);
  font-weight: 400;
  color: var(--c-slate);
}

.page-about .ab-partner__name {
  margin: var(--sp-2) 0 var(--sp-2);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--c-white);
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.64;
  color: var(--c-mist);
}

/* ---------- 本地服务 ---------- */
.page-about .ab-local__grid {
  display: grid;
  gap: var(--sp-5);
}

.page-about .ab-local__list {
  display: grid;
  gap: 0;
  margin: var(--sp-5) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-local__item {
  display: grid;
  gap: 4px;
  padding: var(--sp-3) 0;
  border-bottom: 1px solid rgba(201, 233, 230, .16);
}

.page-about .ab-local__label {
  font-size: var(--fs-1);
  letter-spacing: .16em;
  color: rgba(201, 233, 230, .66);
}

.page-about .ab-local__val {
  font-family: var(--font-mono);
  font-size: var(--fs-3);
  line-height: 1.5;
  color: var(--c-white);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-about .ab-local__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-5);
}

.page-about .ab-local__figure {
  border-color: rgba(234, 244, 244, .2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-hero__frame {
    padding: var(--sp-6) var(--sp-5) var(--sp-6);
  }
}

@media (min-width: 880px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-5);
  }

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

@media (min-width: 900px) {
  .page-about .ab-story__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: var(--sp-6);
    align-items: start;
  }

  .page-about .ab-node {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: var(--sp-4);
    padding-bottom: var(--sp-6);
  }

  .page-about .ab-node__mark {
    margin: 0;
    padding-top: 3px;
  }

  .page-about .ab-node:last-child {
    padding-bottom: 0;
  }

  .page-about .ab-vers__scale {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .ab-ver {
    padding: 22px var(--sp-3) 0 0;
    border-left: 0;
  }

  .page-about .ab-ver::before {
    top: 6px;
    left: 0;
  }

  .page-about .ab-ver::after {
    content: "";
    position: absolute;
    top: 11px;
    left: 13px;
    right: 0;
    height: 1px;
    background: var(--ab-cy-soft);
  }

  .page-about .ab-ver:last-child {
    padding-bottom: 0;
  }

  .page-about .ab-ver:last-child::after {
    display: none;
  }

  .page-about .ab-local__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: var(--sp-6);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node::before,
  .page-about .ab-ver::before {
    transition: none;
  }
}