.page-about {
  --ab-line: rgba(148, 166, 184, 0.28);
  background: var(--fx-ink);
  color: var(--fx-white);
}

.page-about .fx-h2 {
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
}

.page-about .fx-h3 {
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  line-height: 1.3;
  margin: 8px 0 8px;
}

.page-about .fx-p {
  color: var(--fx-slate);
  margin: 14px 0 0;
  max-width: 38em;
}

.page-about .fx-lede {
  color: rgba(255, 255, 255, 0.82);
}

.page-about .fx-media img,
.page-about .ab-plate__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .fx-section--paper {
  color: var(--fx-ink);
}

.page-about .fx-section--paper .fx-p {
  color: var(--fx-paper-text);
}

.page-about .fx-section--paper .fx-kicker {
  color: var(--fx-cyan-deep);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 104px 0 56px;
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 88% -10%, rgba(36, 224, 200, 0.16), transparent 62%),
    radial-gradient(90% 70% at 6% 112%, rgba(255, 90, 31, 0.16), transparent 60%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  font-size: clamp(2.2rem, 8.4vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 15em;
}

.page-about .ab-hero__lede {
  margin-top: 22px;
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  line-height: 1.75;
  max-width: 36em;
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 44px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--fx-hair);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .ab-stat__num {
  font-size: clamp(1.9rem, 5.6vw, 2.7rem);
  line-height: 1;
  color: var(--fx-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--fx-slate);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  padding: 64px 0;
}

.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

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

.page-about .ab-plate__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--fx-hair);
  background: linear-gradient(155deg, rgba(18, 48, 80, 0.92), rgba(4, 11, 18, 0.96));
}

.page-about .fx-section--paper .ab-plate__frame {
  border-color: var(--fx-hair-ink);
  background: linear-gradient(155deg, var(--fx-paper-shade), rgba(227, 217, 200, 0.6));
}

.page-about .ab-plate figcaption {
  margin-top: 12px;
  padding-left: 11px;
  border-left: 2px solid var(--fx-orange);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--fx-slate);
}

.page-about .fx-section--paper .ab-plate figcaption {
  color: var(--fx-paper-text);
}

/* ---------- 时间线 ---------- */
.page-about .ab-path {
  padding: 64px 0;
}

.page-about .ab-path__lede {
  margin-top: 14px;
  max-width: 32em;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 38px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--fx-orange) 0%, var(--ab-line) 26%, var(--ab-line) 72%, transparent 100%);
}

.page-about .ab-phase {
  position: relative;
  padding-bottom: 40px;
}

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

.page-about .ab-phase::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--fx-orange);
  box-shadow: 0 0 0 5px rgba(255, 90, 31, 0.16);
}

.page-about .ab-phase__year {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--fx-cyan);
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-phase .fx-p {
  max-width: 34em;
}

.page-about .ab-more {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--fx-hair);
  max-width: 34em;
}

.page-about .ab-more > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--fx-cyan);
  list-style: none;
}

.page-about .ab-more > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-more > summary::after {
  content: "+";
  font-family: var(--fx-mono);
  font-size: 14px;
}

.page-about .ab-more[open] > summary::after {
  content: "–";
}

.page-about .ab-more p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fx-slate);
}

.page-about .ab-more a,
.page-about .ab-note a {
  color: var(--fx-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 规模 ---------- */
.page-about .ab-scale {
  padding: 64px 0;
}

.page-about .ab-scale__lede {
  margin-top: 16px;
  max-width: 34em;
}

.page-about .ab-scale__grid {
  margin: 34px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--fx-hair);
  background: var(--fx-hair);
}

.page-about .ab-scale__cell {
  padding: 20px 16px;
  background: rgba(10, 25, 41, 0.92);
  min-width: 0;
}

.page-about .ab-scale__cell dt {
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--fx-slate);
}

.page-about .ab-scale__cell dd {
  margin: 12px 0 0;
  font-family: var(--fx-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.55rem, 4.4vw, 2.1rem);
  line-height: 1.1;
  color: var(--fx-orange);
  font-weight: 700;
}

.page-about .ab-scale__cell dd small {
  display: block;
  margin-top: 8px;
  font-family: var(--fx-sans);
  font-weight: 400;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--fx-slate);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: 64px 0;
}

.page-about .ab-team__fig {
  margin: 0 0 34px;
}

.page-about .ab-team__fig .ab-plate__frame {
  aspect-ratio: 14 / 9;
}

.page-about .ab-team__fig figcaption {
  margin-top: 12px;
  padding-left: 11px;
  border-left: 2px solid var(--fx-cyan-deep);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--fx-paper-text);
}

.page-about .ab-team__lede {
  margin-top: 16px;
}

.page-about .ab-team__grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-team__card {
  padding: 20px 18px;
  border: 1px solid rgba(10, 25, 41, 0.16);
  background: rgba(227, 217, 200, 0.48);
  transition: border-color 200ms var(--fx-ease), transform 200ms var(--fx-ease);
}

.page-about .ab-team__card:hover {
  border-color: rgba(10, 25, 41, 0.42);
  transform: translateY(-3px);
}

.page-about .ab-team__card .fx-h3 {
  margin: 0 0 8px;
  color: var(--fx-ink);
}

.page-about .ab-team__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fx-paper-text);
}

/* ---------- 合作 ---------- */
.page-about .ab-partners {
  padding: 64px 0;
}

.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .ab-partners__col--notes {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .ab-note {
  border: 1px solid var(--fx-hair);
  border-left: 2px solid var(--fx-orange);
  padding: 16px 16px 18px;
  background: linear-gradient(150deg, rgba(18, 48, 80, 0.55), rgba(4, 11, 18, 0.55));
}

.page-about .ab-note__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fx-cyan);
  margin-bottom: 8px;
}

.page-about .ab-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
}

/* ---------- 成果 ---------- */
.page-about .ab-outcome {
  padding: 64px 0;
}

.page-about .ab-outcome__grid {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border-top: 1px solid var(--fx-hair);
  border-bottom: 1px solid var(--fx-hair);
  background: var(--fx-hair);
}

.page-about .ab-outcome__item {
  padding: 22px 4px 22px 0;
  background: var(--fx-tide);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-outcome__num {
  font-size: clamp(2rem, 6.4vw, 3rem);
  line-height: 1;
  color: var(--fx-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-outcome__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fx-slate);
}

.page-about .ab-outcome__text {
  margin-top: 26px;
  max-width: 36em;
}

/* ---------- 收尾 ---------- */
.page-about .ab-outro {
  padding: 56px 0 72px;
}

.page-about .ab-outro__fig {
  margin: 0 0 30px;
}

.page-about .ab-outro__fig .ab-plate__frame {
  aspect-ratio: 8 / 3;
}

.page-about .ab-outro__copy {
  max-width: 40em;
}

.page-about .ab-outro__actions {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 焦点了可见性 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--fx-cyan);
  outline-offset: 3px;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero {
    padding: 120px 0 68px;
  }

  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-origin,
  .page-about .ab-path,
  .page-about .ab-scale,
  .page-about .ab-team,
  .page-about .ab-partners,
  .page-about .ab-outcome {
    padding: 84px 0;
  }

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

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

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

  .page-about .ab-outcome__item {
    padding: 26px 22px;
  }
}

/* ---------- 宽屏：展签式两栏 ---------- */
@media (min-width: 980px) {
  .page-about .ab-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-origin__plate {
    order: -1;
  }

  .page-about .ab-timeline {
    padding-left: 34px;
    margin-top: 46px;
  }

  .page-about .ab-phase {
    padding-bottom: 46px;
  }

  .page-about .ab-phase::before {
    left: -40px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .ab-outro {
    padding: 64px 0 96px;
  }

  .page-about .ab-outro__fig {
    margin-bottom: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card {
    transition: none;
  }

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