.page-about {
  --ab-card-bg: linear-gradient(158deg, rgba(19, 43, 64, .88), rgba(8, 26, 43, .68));
  --ab-line: rgba(141, 246, 244, .16);
  --ab-line-strong: rgba(25, 229, 230, .5);
  display: block;
  background: var(--ink);
  color: var(--mist);
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3.4vw, 42px);
  max-width: 74ch;
}

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

/* ---------- 首屏：品牌主张 + 数据说明牌 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(18px, 3vw, 36px) 0 clamp(44px, 6vw, 88px);
  background:
    radial-gradient(880px 500px at 8% -12%, rgba(25, 229, 230, .20), transparent 62%),
    radial-gradient(720px 460px at 104% 4%, rgba(242, 184, 75, .13), transparent 60%),
    var(--ink);
  border-bottom: 1px solid rgba(141, 246, 244, .14);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, rgba(141, 246, 244, .055) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 50px);
  align-items: start;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  max-width: 18ch;
  font-size: clamp(34px, 6.6vw, 68px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.022em;
  color: var(--mist);
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__note {
  margin: 20px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .ab-hero__aside {
  display: grid;
  gap: 18px;
}

.page-about .ab-hero__figure {
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 1px solid var(--ab-line);
}

.page-about .ab-hero__figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--haze);
  background: rgba(4, 18, 28, .72);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.page-about .ab-stat {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 16px 18px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-organic);
}

.page-about .ab-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .ab-stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--haze);
}

/* ---------- 本地服务 ---------- */
.page-about .ab-local {
  padding: clamp(44px, 6vw, 84px) 0;
  background: linear-gradient(180deg, rgba(16, 38, 63, .96), rgba(8, 26, 43, .96));
  border-top: 1px solid rgba(141, 246, 244, .12);
  border-bottom: 1px solid rgba(141, 246, 244, .12);
}

.page-about .ab-local__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-local__grid .card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-organic);
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .ab-local__grid .card:hover {
  border-color: var(--ab-line-strong);
  transform: translateY(-3px);
}

.page-about .card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .card__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--haze);
}

/* ---------- 发展历程：纵向叙事 + 时间线 ---------- */
.page-about .ab-history {
  padding: clamp(48px, 6.4vw, 96px) 0;
  background:
    radial-gradient(640px 420px at 4% 0%, rgba(25, 229, 230, .10), transparent 62%),
    var(--ink);
}

.page-about .ab-history__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .ab-history__text {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--haze);
}

.page-about .ab-history__figure {
  margin: 0;
  border-radius: 8px 22px 8px 22px;
  overflow: hidden;
  border: 1px solid var(--ab-line);
}

.page-about .ab-history__figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--haze);
  background: rgba(4, 18, 28, .72);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(25, 229, 230, .06));
}

.page-about .ab-tl {
  position: relative;
  padding: 16px 18px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-line);
  border-radius: 8px 22px 8px 22px;
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 24px;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(25, 229, 230, .12);
}

.page-about .ab-tl:hover,
.page-about .ab-tl:focus-within {
  border-color: var(--ab-line-strong);
  transform: translateY(-2px);
}

.page-about .ab-tl:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .ab-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-tl__title {
  margin: 7px 0 0;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-tl__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--haze);
}

.page-about .ab-tl__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gold-soft);
  transition: max-height .45s var(--ease), opacity .35s var(--ease), margin-top .45s var(--ease);
}

.page-about .ab-tl:hover .ab-tl__more,
.page-about .ab-tl:focus-within .ab-tl__more {
  max-height: 200px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 版本迭代 ---------- */
.page-about .ab-versions {
  padding: clamp(46px, 6vw, 92px) 0;
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
  border-top: 1px solid rgba(141, 246, 244, .10);
}

.page-about .ab-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .ab-chips__count {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--haze);
}

.page-about .ab-version-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-version {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-line);
  border-top: 3px solid rgba(242, 184, 75, .55);
  border-radius: 8px 22px 8px 22px;
  transition: border-color .35s var(--ease), transform .35s var(--ease);
}

.page-about .ab-version:hover {
  transform: translateY(-3px);
  border-color: var(--ab-line-strong);
  border-top-color: var(--gold);
}

.page-about .ab-version[hidden] {
  display: none;
}

/* ---------- 团队协作 ---------- */
.page-about .ab-team {
  padding: clamp(46px, 6vw, 92px) 0;
  background: var(--ink);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-team__grid .plate {
  padding: clamp(18px, 2.2vw, 24px);
  background: linear-gradient(162deg, rgba(19, 43, 64, .82), rgba(8, 26, 43, .58));
  border-radius: 8px 22px 8px 22px;
  border: 1px solid var(--ab-line);
}

.page-about .plate__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .plate__title {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.42;
  color: var(--mist);
}

.page-about .plate__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--haze);
}

/* ---------- 合作生态与质量控制 ---------- */
.page-about .ab-partners {
  padding: clamp(46px, 6vw, 92px) 0;
  background:
    radial-gradient(700px 430px at 94% 6%, rgba(242, 184, 75, .16), transparent 62%),
    linear-gradient(180deg, var(--ink-2), var(--ink-deep));
  border-top: 1px solid rgba(141, 246, 244, .12);
}

.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 48px);
  align-items: center;
}

.page-about .ab-partners__lead {
  margin: 0;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--haze);
}

.page-about .ab-partners__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-partners__list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-partners__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .ab-partners__figure {
  margin: 0;
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 1px solid rgba(242, 184, 75, .28);
}

.page-about .ab-partners__figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--haze);
  background: rgba(4, 18, 28, .72);
}

/* ---------- 收束行动区 ---------- */
.page-about .ab-cta {
  padding: clamp(46px, 6vw, 86px) 0;
  background:
    linear-gradient(118deg, rgba(25, 229, 230, .16), rgba(242, 184, 75, .10) 62%, transparent),
    var(--ink-2);
  border-top: 1px solid rgba(141, 246, 244, .16);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 16px;
  justify-items: start;
}

.page-about .ab-cta__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(26px, 3.8vw, 42px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.018em;
  color: var(--mist);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--haze);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

.page-about [data-reveal="1"] { transition-delay: .08s; }
.page-about [data-reveal="2"] { transition-delay: .16s; }
.page-about [data-reveal="3"] { transition-delay: .24s; }

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 触屏与窄屏适配 ---------- */
@media (hover: none) {
  .page-about .ab-tl__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (min-width: 700px) {
  .page-about .ab-local__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  }
}

@media (min-width: 940px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-about .ab-history__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-version-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .ab-tl,
  .page-about .ab-local__grid .card,
  .page-about .ab-version {
    transition: none;
  }

  .page-about .ab-tl__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 10px;
    transition: none;
  }
}