.page-about {
  --ab-rail: 28px;
  position: relative;
  background: var(--abyss);
  color: var(--paper);
  padding-bottom: clamp(32px, 5vw, 60px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(1100px 520px at 84% -12%, rgba(45, 226, 230, .14), transparent 62%),
    radial-gradient(760px 460px at 4% 112%, rgba(110, 31, 58, .3), transparent 66%),
    var(--abyss);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .3;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 88px 88px;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-hero__lead h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.08;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .ab-hero__intro {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  color: var(--gold);
  line-height: 1.15;
}

.page-about .ab-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-hero__figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--glass);
  box-shadow: 0 26px 64px rgba(2, 10, 18, .55);
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-hero__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(6, 26, 43, .72);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 目录索引条 ---------- */
.page-about .ab-index {
  background: var(--archive);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-index__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding: 14px 0;
}

.page-about .ab-index__k {
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 6px;
}

.page-about .ab-index__list a {
  display: inline-block;
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--cyan);
  border-color: var(--line-strong);
  background: rgba(45, 226, 230, .08);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding: clamp(40px, 6vw, 82px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-section--tinted {
  background: linear-gradient(180deg, var(--abyss) 0%, var(--archive) 100%);
}

.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .index-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.16;
  color: var(--paper);
}

.page-about .ab-head {
  max-width: 74ch;
  margin-bottom: 26px;
}

.page-about .ab-head__lede,
.page-about .ab-timeline__lede,
.page-about .ab-team__lede {
  margin: 14px 0 0;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-layout__main p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-layout__main p:last-child {
  margin-bottom: 0;
}

.page-about .ab-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-points li {
  position: relative;
  padding: 12px 0 0 24px;
  border-top: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .ab-points li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 20px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  padding: clamp(40px, 6vw, 82px) 0;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--abyss) 0%, var(--archive) 62%, var(--abyss) 100%);
}

.page-about .ab-timeline__head {
  margin-bottom: 26px;
}

.page-about .ab-timeline__banner {
  margin: 0 0 34px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--glass);
}

.page-about .ab-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.page-about .ab-stages {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px var(--ab-rail);
}

.page-about .ab-stages::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--indigo) 58%, rgba(36, 59, 107, 0));
}

.page-about .ab-stage {
  position: relative;
  margin-bottom: 18px;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(140deg, rgba(11, 58, 69, .58), rgba(6, 26, 43, .9));
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .ab-stage:hover {
  border-color: var(--line-strong);
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: calc(7px - var(--ab-rail));
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(45, 226, 230, .1);
}

.page-about .ab-stage--current {
  border-color: var(--line-strong);
  background: linear-gradient(140deg, rgba(11, 58, 69, .72), rgba(36, 59, 107, .5));
}

.page-about .ab-stage--current::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(242, 184, 75, .14);
}

.page-about .ab-stage__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.page-about .ab-stage__ver {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .ab-stage__title {
  margin: 10px 0 6px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-stage__note {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__lede {
  margin-bottom: 20px;
}

.page-about .ab-team__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--archive);
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-team__card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--archive);
}

.page-about .ab-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
}

.page-about .ab-team__unit {
  margin-left: 3px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .ab-team__role {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-rhythm {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-rhythm__item {
  padding: 14px 16px;
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(45, 226, 230, .07);
}

.page-about .ab-rhythm__k {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-rhythm__item p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 区域伙伴 ---------- */
.page-about .ab-partners {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-partner {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(36, 59, 107, .5), rgba(6, 26, 43, .92));
}

.page-about .ab-partner__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .ab-partner__role {
  margin: 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 资质 ---------- */
.page-about .ab-trust {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-trust__card {
  position: relative;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--archive);
}

.page-about .ab-trust__card--gold {
  border-color: rgba(242, 184, 75, .42);
  background: linear-gradient(150deg, rgba(110, 31, 58, .38), var(--archive) 70%);
}

.page-about .ab-trust__mark {
  display: block;
  width: 26px;
  height: 26px;
  margin-bottom: 14px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, rgba(45, 226, 230, .55), transparent 68%);
}

.page-about .ab-trust__mark--gold {
  border-color: var(--gold);
  border-radius: var(--r-sm);
  transform: rotate(45deg);
  background: radial-gradient(circle at 30% 30%, rgba(242, 184, 75, .65), transparent 68%);
}

.page-about .ab-trust__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-trust__meta {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

/* ---------- 版本路线 ---------- */
.page-about .ab-roadmap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-roadmap__card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--indigo);
  border-radius: var(--r-md);
  background: rgba(6, 26, 43, .78);
}

.page-about .ab-roadmap__title {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  color: var(--paper);
}

.page-about .ab-roadmap__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 折叠面板微调 ---------- */
.page-about .ab-stage .accordion__summary {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .accordion__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 后续入口 ---------- */
.page-about .ab-next {
  padding: clamp(36px, 5.5vw, 72px) 0 clamp(20px, 3vw, 32px);
}

.page-about .ab-next__inner {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.4vw, 38px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background:
    radial-gradient(620px 320px at 90% 0%, rgba(45, 226, 230, .12), transparent 66%),
    linear-gradient(140deg, rgba(11, 58, 69, .7), rgba(36, 59, 107, .46));
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .ab-next__copy h2 {
  font-size: clamp(22px, 3vw, 32px);
}

.page-about .ab-next__copy p {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-next__links a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(6, 26, 43, .6);
  font-size: 15px;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .18s ease, background-color .18s ease, color .18s ease;
}

.page-about .ab-next__links a:hover,
.page-about .ab-next__links a:focus-visible {
  border-color: var(--line-strong);
  background: rgba(45, 226, 230, .1);
  color: var(--cyan);
}

.page-about .ab-next__links .mono {
  font-size: 12px;
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px 14px;
  }

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

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

@media (min-width: 768px) {
  .page-about .ab-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: center;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-layout {
    grid-template-columns: minmax(0, .36fr) minmax(0, .64fr);
    gap: clamp(32px, 4.5vw, 60px);
  }

  .page-about .ab-layout--top {
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-stages {
    padding-left: 44px;
  }

  .page-about .ab-stages::before {
    left: 20px;
  }

  .page-about .ab-stage::before {
    left: calc(-23px - (44px - 28px) + 0px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-stage,
  .page-about .ab-index__list a,
  .page-about .ab-next__links a {
    transition: none;
  }

  .page-about .ab-trust__mark--gold {
    transform: none;
  }
}
<<<END>>>