.page-about {
  --ab-line: rgba(143, 166, 196, 0.32);
  --ab-line-dark: rgba(10, 22, 56, 0.16);
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  padding-top: 20px;
  padding-bottom: 40px;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  margin-top: 30px;
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--indigo);
}

.page-about .ab-kicker::before {
  content: "";
  width: 22px;
  height: 6px;
  background: var(--orange);
  transform: skewX(-20deg);
}

.page-about .ab-hero__title {
  margin: 0 0 18px;
  max-width: 15em;
  font-size: var(--fs-7);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .ab-hero__lede {
  margin: 0 0 24px;
  max-width: 34em;
  font-size: var(--fs-3);
  line-height: 1.75;
  color: var(--ink);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--indigo);
}

.page-about .ab-stat {
  padding: 16px 0 15px;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-stat__value {
  font-size: var(--fs-6);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--indigo);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat__unit {
  margin-left: 0.18em;
  font-size: var(--fs-4);
  font-weight: 800;
  color: var(--orange);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 7px;
  font-size: var(--fs-2);
  line-height: 1.6;
  color: #4a4038;
}

/* ============ 色带 ============ */
.page-about .ab-band {
  margin: 0 0 28px;
}

/* ============ 定位 ============ */
.page-about .ab-pos {
  padding-top: 20px;
  padding-bottom: 48px;
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 3px solid var(--cyan);
}

.page-about .ab-flow__step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0 12px 16px;
}

.page-about .ab-flow__step + .ab-flow__step {
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-flow__n {
  font-size: var(--fs-2);
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-flow__t {
  font-size: var(--fs-3);
  line-height: 1.6;
  color: var(--ink);
}

/* ============ 服务对象 ============ */
.page-about .ab-aud__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: 22px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-aud__row {
  padding: 22px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-aud__idx {
  display: block;
  margin-bottom: 10px;
  font-size: var(--fs-2);
  font-weight: 900;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-aud__title {
  margin: 0 0 8px;
  font-size: var(--fs-4);
  font-weight: 800;
  line-height: 1.3;
  color: var(--frost);
}

.page-about .ab-aud__text {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-3);
  line-height: 1.75;
  color: var(--mist);
}

/* ============ 发展历程 ============ */
.page-about .ab-tl-sec {
  padding-bottom: 56px;
}

.page-about .ab-tl__figure {
  margin: 0 0 40px;
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 242, 214, 0.14) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 7px;
  width: 14px;
  height: 14px;
  background: var(--midnight);
  border: 2px solid var(--cyan);
  border-radius: 2px;
  transform: rotate(45deg);
  transition: background-color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before,
.page-about .ab-tl__item:focus-visible::before {
  background: var(--cyan);
}

.page-about .ab-tl__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 2px;
}

.page-about .ab-tl__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 5px;
}

.page-about .ab-tl__ver {
  font-size: var(--fs-2);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__year {
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  font-weight: 800;
  line-height: 1.35;
  color: var(--frost);
}

.page-about .ab-tl__text {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-3);
  line-height: 1.72;
  color: var(--mist);
}

/* ============ 团队 ============ */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.page-about .ab-team__lede {
  margin: 0 0 22px;
  max-width: 30em;
  font-size: var(--fs-3);
  line-height: 1.75;
  color: #4a4038;
}

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

.page-about .ab-team__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--ab-line-dark);
  transition: border-color 160ms var(--ease);
}

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

.page-about .ab-team__row:hover,
.page-about .ab-team__row:focus-visible {
  border-top-color: var(--cyan);
}

.page-about .ab-team__row:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 2px;
}

.page-about .ab-team__num {
  font-size: var(--fs-6);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--indigo);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-team__name {
  margin: 0 0 6px;
  font-size: var(--fs-4);
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .ab-team__duty {
  margin: 0;
  max-width: 32em;
  font-size: var(--fs-3);
  line-height: 1.72;
  color: #4a4038;
}

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

/* ============ 合作生态 ============ */
.page-about .ab-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.page-about .ab-eco__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-eco__fact {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-eco__fnum {
  font-size: var(--fs-6);
  font-weight: 900;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-eco__ftext {
  font-size: var(--fs-3);
  line-height: 1.6;
  color: var(--frost);
}

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

/* ============ 覆盖与收束 ============ */
.page-about .ab-reach {
  padding-bottom: 60px;
}

.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 24px;
}

.page-about .ab-reach__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--cyan);
}

.page-about .ab-reach__stat {
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-reach__num {
  font-size: var(--fs-6);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-reach__cap {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-2);
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-cta {
  margin-top: 42px;
  padding-top: 24px;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-cta__text {
  margin: 0 0 16px;
  max-width: 32em;
  font-size: var(--fs-3);
  line-height: 1.7;
  color: var(--frost);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 断点 ============ */
@media (min-width: 700px) {
  .page-about .ab-hero__title {
    font-size: var(--fs-8);
  }

  .page-about .ab-aud__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 26px;
  }

  .page-about .ab-aud__row {
    border-bottom: 0;
    border-top: 1px solid var(--ab-line);
    padding-top: 20px;
  }

  .page-about .ab-aud__idx {
    margin-bottom: 14px;
  }

  .page-about .ab-eco__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 24px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding-top: 32px;
    padding-bottom: 56px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    margin-top: 46px;
  }

  .page-about .ab-hero__copy {
    grid-column: 1 / span 7;
  }

  .page-about .ab-hero__aside {
    grid-column: 8 / span 5;
    padding-left: 32px;
    border-left: 1px solid var(--ab-line-dark);
  }

  .page-about .ab-split {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    margin-top: 30px;
  }

  .page-about .ab-split__main {
    grid-column: 1 / span 7;
  }

  .page-about .ab-split__side {
    grid-column: 9 / span 4;
    padding-top: 6px;
  }

  .page-about .ab-tl {
    padding-left: 64px;
    max-width: 900px;
  }

  .page-about .ab-tl::before {
    left: 6px;
  }

  .page-about .ab-tl__item {
    padding-bottom: 30px;
    padding-right: 24px;
  }

  .page-about .ab-tl__item::before {
    left: -64px;
  }

  .page-about .ab-tl__item:nth-child(even) {
    margin-left: 42px;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    margin-top: 30px;
  }

  .page-about .ab-team__col {
    grid-column: 1 / span 7;
  }

  .page-about .ab-team__figure {
    grid-column: 9 / span 4;
    align-self: start;
  }

  .page-about .ab-eco {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    margin-top: 30px;
  }

  .page-about .ab-eco__intro {
    grid-column: 1 / span 6;
  }

  .page-about .ab-eco__figure {
    grid-column: 8 / span 5;
    align-self: start;
  }

  .page-about .ab-reach__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
    margin-top: 30px;
  }

  .page-about .ab-reach__main {
    grid-column: 1 / span 7;
  }

  .page-about .ab-reach__stats {
    grid-column: 9 / span 4;
    align-self: start;
  }

  .page-about .ab-cta {
    margin-top: 56px;
    padding-top: 30px;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
  }

  .page-about .ab-cta__text {
    margin: 0;
    max-width: 26em;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero__title {
    font-size: var(--fs-8);
  }

  .page-about .ab-tl__item:nth-child(even) {
    margin-left: 96px;
  }
}

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