.page-about {
  --about-r: 26px;
  --about-r-sm: 18px;
  --about-gap: 22px;
  padding: 22px 0 78px;
  color: var(--text);
  overflow-x: clip;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 24px;
  font-size: .82rem;
  color: var(--text-dim);
}

.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumb__sep {
  margin: 0 9px;
  color: var(--line);
}

.page-about h2,
.page-about h3 {
  margin: 0;
}

.page-about figure {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.95rem, 6.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-dim);
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .about-stats__cell {
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r-sm);
  background: linear-gradient(160deg, rgba(122, 77, 255, .16), rgba(11, 18, 38, .92));
}

.page-about .about-stats dt {
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .about-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: .92rem;
  color: var(--text);
}

.page-about .about-stats .num {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 里程碑 ---------- */
.page-about .about-timeline {
  padding: 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r);
  background:
    linear-gradient(200deg, rgba(122, 77, 255, .16), rgba(11, 18, 38, .94)),
    var(--ink-900);
}

.page-about .about-timeline__title {
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.page-about .milestones {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .milestone {
  border-left: 2px solid var(--line);
  border-radius: 0 var(--about-r-sm) var(--about-r-sm) 0;
  background: rgba(20, 27, 51, .6);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .milestone[open] {
  border-left-color: var(--cyan);
  background: rgba(20, 27, 51, .95);
}

.page-about .milestone:hover {
  border-left-color: var(--purple);
}

.page-about .milestone__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .milestone__stage {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .milestone__name {
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .milestone__body {
  padding: 0 15px 15px;
  font-size: .89rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .milestone__body p {
  margin: 0;
}

.page-about .about-timeline__foot {
  margin: 16px 0 0;
  font-size: .78rem;
  color: var(--text-dim);
}

/* ---------- 通用区块 ---------- */
.page-about .about-h2 {
  margin: 10px 0 18px;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.65rem, 4.6vw, 2.6rem);
  line-height: 1.3;
  color: var(--text);
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: .98rem;
  line-height: 1.88;
  color: var(--text-dim);
}

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

.page-about .prose strong {
  font-weight: 600;
  color: var(--text);
}

.page-about .about-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 22px 0 0;
  padding: 14px 16px;
  border: 1px dashed var(--line);
  border-radius: var(--about-r-sm);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--text);
  background: rgba(42, 212, 166, .06);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 74px;
}

.page-about .media {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-950));
}

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

.page-about .media__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--text);
  background: rgba(5, 7, 15, .72);
  border: 1px solid var(--line-soft);
}

/* ---------- 内容体系轨道 ---------- */
.page-about .about-system {
  margin-top: 78px;
}

.page-about .about-system__note,
.page-about .about-partners__note {
  max-width: 66ch;
  margin: 14px 0 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .track-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.page-about .track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px 20px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(20, 27, 51, .85), rgba(11, 18, 38, .95));
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .track::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--track-color);
}

.page-about .track--cyan { --track-color: var(--cyan); }
.page-about .track--purple { --track-color: var(--purple); }
.page-about .track--amber { --track-color: var(--amber); }
.page-about .track--red { --track-color: var(--red); }

.page-about .track:hover {
  transform: translateY(-4px);
  border-color: var(--track-color);
  box-shadow: 0 20px 44px rgba(5, 7, 15, .62);
}

.page-about .track__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--track-color);
}

.page-about .track__title {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .track__list {
  margin: 0;
  padding-left: 1.05em;
  font-size: .87rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .track__list li + li {
  margin-top: 6px;
}

.page-about .track__link {
  align-self: flex-start;
  margin-top: auto;
  padding-top: 6px;
  font-size: .86rem;
  font-weight: 600;
  color: var(--track-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.page-about .track__link:hover,
.page-about .track__link:focus-visible {
  border-bottom-color: currentColor;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: 78px;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 30px;
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .role {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r-sm);
  background: rgba(20, 27, 51, .55);
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .role:hover {
  transform: translateY(-3px);
  border-color: var(--purple);
  background: rgba(122, 77, 255, .16);
}

.page-about .role__name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .role__desc {
  margin: 10px 0 0;
  font-size: .87rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 节奏与覆盖 ---------- */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 78px;
}

.page-about .pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .pill-row .chip {
  display: inline-block;
  padding: 8px 16px;
  font-size: .84rem;
  color: var(--text);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  margin-top: 78px;
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .partner-card {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 22px;
  background: linear-gradient(170deg, rgba(11, 18, 38, .96), rgba(20, 27, 51, .7));
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .partner-card__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .partner-card__desc {
  margin: 10px 0 0;
  font-size: .87rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-partners__stats {
  display: grid;
  gap: 12px;
  margin-top: 22px;
  padding: 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r);
  background: linear-gradient(120deg, rgba(53, 224, 255, .1), rgba(5, 7, 15, .9) 60%);
}

.page-about .about-partners__stats p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-partners__stats .num {
  font-family: var(--font-mono);
  font-size: 1.28rem;
  font-weight: 600;
  color: var(--cyan);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 78px;
  padding: 30px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--about-r);
  background:
    radial-gradient(130% 150% at 6% 0%, rgba(122, 77, 255, .22), rgba(5, 7, 15, .92) 58%),
    var(--ink-900);
}

.page-about .about-next__title {
  margin-bottom: 12px;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.4rem, 4vw, 2rem);
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-next__text p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--text-dim);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .track-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 980px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 54px;
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-rhythm {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
    padding: 40px;
  }

  .page-about .about-partners__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(320px, .95fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-timeline {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
}

@media (min-width: 1180px) {
  .page-about .track-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .track,
  .page-about .role,
  .page-about .partner-card,
  .page-about .milestone {
    transition: none;
  }

  .page-about .track:hover,
  .page-about .role:hover,
  .page-about .partner-card:hover {
    transform: none;
  }
}