.page-about {
  --about-gap: clamp(56px, 8vw, 116px);
  --about-ink: #10141F;
  background: var(--bg);
  color: var(--txt);
  overflow-x: clip;
}

.page-about a {
  color: var(--accent-text);
}

.page-about a.btn {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding: 20px 0 4px;
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 24px 0 clamp(48px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% auto auto;
  width: min(620px, 78vw);
  height: min(620px, 78vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(107, 78, 255, 0.22), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero__lead .annot {
  display: block;
  margin: 0 0 16px;
  color: var(--accent-text);
}

.page-about .about-hero__lead h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 62px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.28);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--txt-dim);
}

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

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

.page-about .stat-card {
  background: var(--surf);
  border: 2px solid var(--nebula);
  box-shadow: var(--shadow-mid);
  padding: 20px 20px 22px;
}

.page-about .stat-card .num {
  display: block;
  margin-bottom: 8px;
  color: var(--data);
}

.page-about .stat-card__cap {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--txt-dim);
}

/* ---------- 章节引导条 ---------- */
.page-about .chapter {
  margin-bottom: 30px;
}

.page-about .chapter__title {
  max-width: 22ch;
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stage {
  padding: var(--about-gap) 0 0;
}

.page-about .about-stage__figure {
  margin: 0 0 42px;
  border: 2px solid var(--line-2);
  box-shadow: var(--shadow-hard);
  background: var(--surf-2);
}

.page-about .about-stage__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .about-stage__figure .frame__cap {
  display: block;
  padding: 10px 14px;
  border-top: 2px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--txt-dim);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(180deg, var(--nebula) 0%, var(--cyan) 55%, var(--ember) 100%);
  opacity: 0.6;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 52px;
  margin-bottom: 20px;
}

.page-about .timeline__node {
  position: absolute;
  left: 0;
  top: 18px;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  border: 2px solid var(--nebula);
  background:
    radial-gradient(circle at 50% 50%, var(--cyan) 0 3px, transparent 4px),
    var(--bg);
  box-shadow: 0 0 0 5px rgba(107, 78, 255, 0.16);
}

.page-about .timeline__card {
  background: var(--paper-solid);
  color: var(--about-ink);
  border: 2px solid var(--void-deep);
  box-shadow: var(--shadow-mid);
}

.page-about .timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline__head::-webkit-details-marker {
  display: none;
}

.page-about .timeline__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--indigo);
}

.page-about .timeline__name {
  flex: 1 1 12ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .timeline__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 2px solid var(--indigo);
  color: var(--indigo);
}

.page-about .timeline__card[open] .timeline__meta {
  border-color: var(--nebula);
  background: var(--nebula);
  color: #fff;
}

.page-about .timeline__body {
  padding: 0 18px 18px;
  border-top: 2px dashed rgba(16, 20, 31, 0.2);
  margin-top: 0;
}

.page-about .timeline__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #2b303d;
}

/* ---------- 数据链路 ---------- */
.page-about .about-chain {
  padding: var(--about-gap) 0 0;
}

.page-about .chain {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .chain__steps {
  display: grid;
  gap: 14px;
}

.page-about .chain__step {
  border: 2px solid var(--line-2);
  border-left: 6px solid var(--nebula);
  background: var(--surf-2);
  box-shadow: var(--shadow-mid);
}

.page-about .chain__step[open] {
  border-left-color: var(--cyan);
}

.page-about .chain__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .chain__head::-webkit-details-marker {
  display: none;
}

.page-about .chain__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 7px;
  border: 2px solid var(--cyan);
  color: var(--cyan);
}

.page-about .chain__label {
  flex: 1 1 10ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--txt);
}

.page-about .chain__val {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ember);
}

.page-about .chain__step p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--txt-dim);
}

.page-about .chain__aside {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .chain__figure {
  margin: 0;
  border: 2px solid var(--line-2);
  box-shadow: var(--shadow-hard);
  background: var(--bg-deep);
}

.page-about .chain__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 9 / 7;
}

.page-about .chain__figure .frame__cap {
  display: block;
  padding: 10px 14px;
  border-top: 2px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--txt-dim);
}

.page-about .chain__note {
  padding: 18px;
  border: 2px solid var(--cyan);
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1), transparent 70%);
}

.page-about .chain__note .num {
  display: block;
  color: var(--data);
  margin-bottom: 8px;
}

.page-about .chain__note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--txt-dim);
}

/* ---------- 内容团队 ---------- */
.page-about .about-team {
  position: relative;
  margin-top: var(--about-gap);
  padding: clamp(48px, 7vw, 96px) 0;
  background: var(--bg-deep);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  isolation: isolate;
}

.page-about .about-team__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.page-about .about-team__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.page-about .about-team__lede {
  max-width: 68ch;
  margin: 0 0 34px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--txt-dim);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .team-card {
  padding: 22px 20px 24px;
  background: var(--paper-solid);
  color: var(--about-ink);
  border: 2px solid var(--void-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .team-card__k {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 8vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo);
}

.page-about .team-card__h {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--about-ink);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #2b303d;
}

.page-about .team-types {
  margin-top: 34px;
  padding: 24px 20px;
  border: 2px solid var(--line-2);
  background: rgba(28, 36, 56, 0.72);
}

.page-about .team-types__h {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  color: var(--txt);
}

.page-about .team-types__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .team-types__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding-left: 10px;
  border-left: 3px solid transparent;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--txt-dim);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .team-types__list li:hover {
  transform: translateX(6px);
  border-left-color: var(--cyan);
}

.page-about .team-types__list .tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border: 2px solid var(--nebula);
  color: var(--txt);
}

.page-about .team-types__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--txt-dim);
}

/* ---------- 安全与合规 ---------- */
.page-about .about-trust {
  padding: var(--about-gap) 0 0;
}

.page-about .trust-band {
  background: linear-gradient(112deg, var(--indigo) 0%, rgba(58, 46, 122, 0.35) 58%, transparent 100%);
  border: 2px solid var(--line-2);
  box-shadow: var(--shadow-hard);
  padding: 26px 20px;
}

.page-about .trust-band__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .trust-item .annot {
  display: block;
  margin-bottom: 10px;
  color: var(--cyan-soft);
}

.page-about .trust-item__h {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  color: var(--txt);
}

.page-about .trust-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--txt-dim);
}

.page-about .trust-band__foot {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 2px solid rgba(216, 222, 233, 0.22);
  font-size: 14px;
  line-height: 1.8;
  color: var(--txt-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: var(--about-gap) 0 0;
}

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

.page-about .eco__text p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--txt-dim);
}

.page-about .eco__figure {
  margin: 0;
  border: 2px solid var(--line-2);
  background: radial-gradient(circle at 50% 45%, rgba(107, 78, 255, 0.18), transparent 68%), var(--surf-2);
  box-shadow: var(--shadow-hard);
}

.page-about .constellation {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .constellation__links line {
  stroke: rgba(0, 229, 255, 0.35);
  stroke-width: 1.5;
  stroke-dasharray: 5 6;
}

.page-about .constellation__node circle {
  fill: rgba(11, 15, 26, 0.9);
  stroke: var(--nebula);
  stroke-width: 2;
  transition: stroke 0.22s var(--ease), fill 0.22s var(--ease);
}

.page-about .constellation__node text {
  fill: var(--txt);
  font-family: var(--font-mono);
  font-size: 15px;
  text-anchor: middle;
  font-variant-numeric: tabular-nums;
}

.page-about .constellation__node .constellation__sub {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--txt-dim);
  letter-spacing: 0.06em;
}

.page-about .constellation__node:hover circle {
  stroke: var(--cyan);
  fill: rgba(0, 229, 255, 0.12);
}

.page-about .eco__figure .frame__cap {
  display: block;
  padding: 10px 14px;
  border-top: 2px solid var(--line-2);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--txt-dim);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: var(--about-gap);
  padding: clamp(44px, 6vw, 76px) 0 clamp(56px, 8vw, 96px);
  background: linear-gradient(180deg, transparent, rgba(255, 138, 61, 0.09));
  border-top: 2px solid var(--line);
}

.page-about .about-cta__h {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.25;
  color: var(--txt);
}

.page-about .about-cta__p {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--txt-dim);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-hero__side {
    padding-top: 12px;
  }

  .page-about .timeline__item {
    padding-left: 66px;
  }

  .page-about .timeline::before {
    left: 21px;
  }

  .page-about .timeline__node {
    width: 45px;
    height: 45px;
    top: 16px;
  }

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

  .page-about .trust-band {
    padding: 36px 32px;
  }

  .page-about .trust-band__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about .chain {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 1.05fr);
    gap: 46px;
    align-items: center;
  }

  .page-about .about-hero {
    padding-top: 40px;
  }

  .page-about .timeline__item {
    padding-left: 84px;
  }

  .page-about .timeline::before {
    left: 25px;
  }

  .page-about .timeline__node {
    width: 53px;
    height: 53px;
  }

  .page-about .timeline__card {
    max-width: 78ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-types__list li,
  .page-about .constellation__node circle {
    transition: opacity 0.12s linear;
  }

  .page-about .team-types__list li:hover {
    transform: none;
  }
}