.page-about {
  --ab-rail: 208px;
  --ab-gap: clamp(28px, 5vw, 72px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 52px) 0 clamp(38px, 6vw, 72px);
  background:
    linear-gradient(180deg, rgba(3, 18, 14, .9) 0%, rgba(6, 35, 28, 0) 42%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(143, 247, 226, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 247, 226, .05) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(ellipse at 22% 30%, #000 0%, transparent 72%);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__slab {
  position: absolute;
  right: -8%;
  bottom: -38%;
  width: min(560px, 78vw);
  height: min(560px, 78vw);
  background: linear-gradient(148deg, rgba(43, 243, 200, .16) 0%, rgba(255, 90, 43, .08) 58%, transparent 78%);
  clip-path: polygon(20% 0, 100% 0, 100% 80%, 0 100%);
  pointer-events: none;
  z-index: -1;
}

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

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.6vw, 92px);
  line-height: .96;
  letter-spacing: -.012em;
  color: var(--white);
  margin: 14px 0 0;
}

.page-about .ab-hero__lede {
  margin-top: clamp(18px, 3vw, 28px);
  max-width: 68ch;
}

.page-about .ab-hero__marks {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
}

.page-about .ab-hero__marks li {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cyan-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  background: rgba(43, 243, 200, .04);
}

.page-about .ab-hero__marks .num {
  color: var(--cyan);
  font-size: 15px;
  letter-spacing: .02em;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .ab-team__lede > p {
  font-size: 17px;
  line-height: 1.75;
  color: var(--white);
  max-width: 66ch;
  margin: 0 0 clamp(22px, 3vw, 32px);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0 0 clamp(24px, 3vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 20px 6px 20px 6px;
  overflow: hidden;
}

.page-about .ab-stat {
  background: var(--ink);
  padding: clamp(16px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stat__v {
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--cyan);
  font-weight: 600;
}

.page-about .ab-stat__k {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-team__prose p + p {
  margin-top: 16px;
}

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

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 22px 6px 22px 6px;
  filter: saturate(.82) contrast(1.06);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-stage {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-stage__rail {
  border-left: 2px solid var(--line);
  padding-left: 18px;
}

.page-about .ab-stage__rail-label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 12px;
}

.page-about .ab-stage__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-stage__rail-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 30ch;
}

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

.page-about .ab-stage__item {
  position: relative;
  padding: 0 0 clamp(26px, 3.4vw, 38px) 24px;
  border-left: 1px solid var(--line);
}

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

.page-about .ab-stage__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--flare);
  box-shadow: 0 0 0 4px rgba(255, 90, 43, .14);
}

.page-about .ab-stage__item.is-hidden {
  display: none;
}

.page-about .ab-stage__no {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
  margin: 0 0 6px;
}

.page-about .ab-stage__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .ab-stage__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--cyan-soft);
  max-width: 62ch;
}

.page-about .ab-stage__figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .ab-stage__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px 22px 6px 22px;
  filter: saturate(.8) contrast(1.05);
}

/* ---------- 数据来源 ---------- */
.page-about .ab-src {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-src__chart {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 22px 6px 22px 6px;
  padding: clamp(12px, 2vw, 22px);
}

.page-about .ab-flow {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-flow__grid line {
  stroke: rgba(143, 247, 226, .07);
  stroke-width: 1;
}

.page-about .ab-flow__wire path {
  fill: none;
  stroke: rgba(43, 243, 200, .3);
  stroke-width: 1.5;
}

.page-about .ab-flow__node rect {
  fill: rgba(43, 243, 200, .06);
  stroke: rgba(43, 243, 200, .26);
  stroke-width: 1;
  transition: fill .22s var(--ease), stroke .22s var(--ease);
}

.page-about .ab-flow__node rect:hover {
  fill: rgba(43, 243, 200, .16);
  stroke: var(--cyan);
}

.page-about .ab-flow__sink rect {
  fill: rgba(43, 243, 200, .13);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-about .ab-flow text {
  font-family: var(--font-body);
  font-size: 14px;
  fill: var(--white);
  text-anchor: middle;
}

.page-about .ab-flow text.ab-flow__sub {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .06em;
  fill: var(--cyan);
}

.page-about .ab-src__text p + p {
  margin-top: 16px;
}

.page-about .ab-src__foot {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
  padding: 16px clamp(14px, 2vw, 22px);
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(43, 243, 200, .08), transparent 72%);
  border-radius: 0 18px 18px 0;
}

.page-about .ab-src__foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cyan-soft);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-scope {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-scope__row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 6px 16px;
  padding: clamp(15px, 2.2vw, 20px) clamp(2px, 1vw, 8px);
  background: var(--ink);
  transition: background .22s var(--ease);
}

.page-about .ab-scope__row:hover {
  background: var(--panel);
}

.page-about .ab-scope__k {
  font-size: 15px;
  color: var(--white);
  letter-spacing: .02em;
}

.page-about .ab-scope__v {
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1;
  color: var(--cyan);
  text-align: right;
  font-weight: 600;
}

.page-about .ab-scope__v--txt {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0;
  font-size: clamp(18px, 2.2vw, 22px);
}

.page-about .ab-scope__u {
  font-size: .62em;
  margin-left: 2px;
  color: var(--cyan-soft);
}

.page-about .ab-scope__d {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-scope__note {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  font-family: var(--font-data);
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: .02em;
  color: var(--mist);
  max-width: 74ch;
}

/* ---------- 被读懂 ---------- */
.page-about .ab-read {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-read__body p + p {
  margin-top: 16px;
}

.page-about .ab-read__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .ab-read__figure {
  margin: clamp(28px, 4vw, 46px) 0 0;
  position: relative;
}

.page-about .ab-read__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 22px 6px 22px 6px;
  filter: saturate(.7) brightness(.85) contrast(1.08);
}

.page-about .ab-read__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 22px 6px 22px 6px;
  background: linear-gradient(180deg, rgba(6, 35, 28, .1) 0%, rgba(3, 18, 14, .78) 100%);
  pointer-events: none;
}

.page-about .ab-read__figure .figure__cap {
  position: relative;
  z-index: 1;
  margin-top: -46px;
  padding: 0 clamp(16px, 3vw, 28px) 18px;
  color: var(--white);
}

/* ---------- 尾部合作条 ---------- */
.page-about .ab-tail {
  margin-top: clamp(46px, 7vw, 96px);
  padding: clamp(32px, 5vw, 60px) 0;
  background:
    linear-gradient(115deg, rgba(43, 243, 200, .1) 0%, rgba(6, 35, 28, 0) 52%),
    var(--ink-deep);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-tail__inner {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  align-items: end;
}

.page-about .ab-tail__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 48px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 10px 0 12px;
}

.page-about .ab-tail__text p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--cyan-soft);
  max-width: 60ch;
}

.page-about .ab-tail__btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-scope__row {
    grid-template-columns: minmax(150px, 220px) 132px 1fr;
    gap: 6px 24px;
  }

  .page-about .ab-scope__k {
    grid-column: 1;
  }

  .page-about .ab-scope__v {
    grid-column: 2;
    text-align: left;
  }

  .page-about .ab-scope__d {
    grid-column: 3;
  }
}

@media (min-width: 860px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-stage {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .ab-stage__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .ab-stage__item {
    padding-left: 32px;
  }

  .page-about .ab-stage__item::before {
    left: -4.5px;
  }

  .page-about .ab-src {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(34px, 4.6vw, 64px);
  }

  .page-about .ab-read {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-read__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .ab-read__actions .btn {
    text-align: center;
  }

  .page-about .ab-tail__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .ab-tail__btn {
    justify-self: end;
  }
}

@media (max-width: 480px) {
  .page-about .ab-hero__title br {
    display: none;
  }

  .page-about .ab-flSTAGE {
    display: none;
  }
}