.page-about {
  --about-rule: 1px solid rgba(169, 179, 196, 0.22);
  --about-rule-strong: 1px solid rgba(169, 179, 196, 0.4);
  --about-pad: clamp(44px, 7vw, 92px);
  color: var(--paper);
}

.page-about .crumbs {
  padding: clamp(14px, 2.4vw, 22px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 54px) 0 var(--about-pad);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(216, 166, 43, 0.5), transparent);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__pledge {
  display: grid;
  gap: 0;
  margin: 0;
  border-top: var(--about-rule-strong);
}

.page-about .about-hero__pledge-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-hero__pledge-item dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-hero__pledge-item dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__caption {
  display: block;
  margin-top: 10px;
  color: var(--mist);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  background: var(--ink-2);
}

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

.page-about .about-index__label {
  color: var(--iron);
}

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

.page-about .about-index__list a {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid rgba(169, 179, 196, 0.3);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(24px, 3.6vw, 40px);
  padding-top: 16px;
  border-top: 3px solid var(--iron);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-head__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-pad) 0;
}

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

.page-about .about-team__cell {
  display: grid;
  gap: 10px;
  padding: 20px 20px 22px;
  background: var(--ink-2);
  border: 1px solid rgba(169, 179, 196, 0.18);
  border-left: 6px solid var(--gold);
}

.page-about .about-team__cell--build { border-left-color: var(--cyan); }
.page-about .about-team__cell--care { border-left-color: var(--magenta); }
.page-about .about-team__cell--edit { border-left-color: var(--lemon); }

.page-about .about-team__count {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 54px);
  font-weight: 700;
  line-height: 0.9;
  color: var(--gold);
}

.page-about .about-team__cell--build .about-team__num { color: var(--cyan); }
.page-about .about-team__cell--care .about-team__num { color: var(--magenta); }
.page-about .about-team__cell--edit .about-team__num { color: var(--lemon); }

.page-about .about-team__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

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

.page-about .about-team__foot {
  margin: 26px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: var(--about-pad) 0;
  background: var(--ink-2);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-timeline__track {
  position: relative;
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink);
  border: 1px solid rgba(169, 179, 196, 0.2);
  outline: none;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(21, 227, 212, 0.55);
}

.page-about .about-timeline__dot {
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: 12px;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(216, 166, 43, 0.22);
}

.page-about .about-timeline__node:nth-child(3n + 2) .about-timeline__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(21, 227, 212, 0.22);
}

.page-about .about-timeline__node:nth-child(3n + 3) .about-timeline__dot {
  background: var(--magenta);
  box-shadow: 0 0 0 3px rgba(255, 61, 139, 0.22);
}

.page-about .about-timeline__range {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-timeline__label {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-timeline__more {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed rgba(169, 179, 196, 0.26);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-versions {
  padding: var(--about-pad) 0;
}

.page-about .about-versions__layout {
  display: grid;
  gap: clamp(24px, 3.4vw, 42px);
}

.page-about .about-versions__list {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-version {
  background: var(--ink-2);
  border: 1px solid rgba(169, 179, 196, 0.2);
}

.page-about .about-version[open] {
  background: var(--ink-3);
  border-color: rgba(216, 166, 43, 0.55);
}

.page-about .about-version__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--dur) var(--ease);
}

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

.page-about .about-version__head:hover {
  background: rgba(216, 166, 43, 0.08);
}

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

.page-about .about-version__no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-version__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16px;
  color: var(--paper);
}

.page-about .about-version__stage {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-version__body {
  padding: 0 18px 18px;
  border-top: 1px dashed rgba(169, 179, 196, 0.24);
  margin-top: 0;
}

.page-about .about-version__body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-versions__note {
  margin: 8px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--lemon);
  background: rgba(166, 241, 74, 0.06);
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-versions__aside {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-versions__aside-note {
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: var(--about-pad) 0;
  background: var(--ink-2);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
  align-items: center;
}

.page-about .about-partners__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-partners__text {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-partners__list {
  display: grid;
  gap: 10px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper);
}

.page-about .about-partners__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-partners__cta {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-partners__cta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(21, 227, 212, 0.45);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 识别体系 ---------- */
.page-about .about-identity {
  padding: var(--about-pad) 0;
}

.page-about .about-identity__grid {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
}

.page-about .about-identity__swatches {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.page-about .about-identity__chip {
  display: block;
  height: 76px;
  border: 3px solid var(--iron);
  box-shadow: var(--shadow-tight);
}

.page-about .about-identity__chip--ink { background: var(--ink); }
.page-about .about-identity__chip--gold { background: var(--gold); }
.page-about .about-identity__chip--cyan { background: var(--cyan); }
.page-about .about-identity__chip--magenta { background: var(--magenta); }
.page-about .about-identity__chip--lemon { background: var(--lemon); }
.page-about .about-identity__chip--paper { background: var(--paper); }

.page-about .about-identity__prose p {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-identity__prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(21, 227, 212, 0.45);
}

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

/* ---------- 收束区 ---------- */
.page-about .about-next {
  padding: clamp(38px, 5.4vw, 68px) 0 clamp(48px, 7vw, 88px);
  border-top: 3px solid var(--iron);
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
}

.page-about .about-next__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-next__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .about-next__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-identity__swatches {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about .about-team__matrix {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team__matrix {
    grid-template-columns: 18fr 12fr 9fr 7fr;
    gap: 0;
    align-items: stretch;
    border: var(--border);
    background: var(--ink-2);
  }

  .page-about .about-team__cell {
    border: none;
    border-left: 1px solid rgba(169, 179, 196, 0.2);
    border-top: 5px solid var(--gold);
    background: transparent;
    padding: 24px 18px 28px;
  }

  .page-about .about-team__cell:first-child {
    border-left: none;
  }

  .page-about .about-team__cell--build { border-top-color: var(--cyan); }
  .page-about .about-team__cell--care { border-top-color: var(--magenta); }
  .page-about .about-team__cell--edit { border-top-color: var(--lemon); }

  .page-about .about-team__num {
    font-size: clamp(36px, 3.4vw, 52px);
  }

  .page-about .about-timeline__track {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0;
    padding-top: 34px;
  }

  .page-about .about-timeline__track::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 6px;
    height: 2px;
    background: var(--iron);
  }

  .page-about .about-timeline__node {
    background: transparent;
    border: none;
    border-left: 1px solid rgba(169, 179, 196, 0.18);
    padding: 22px 14px 20px;
  }

  .page-about .about-timeline__node:first-child {
    border-left: none;
    padding-left: 0;
  }

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus-visible {
    transform: translateY(-3px);
    background: rgba(21, 227, 212, 0.05);
  }

  .page-about .about-timeline__dot {
    position: absolute;
    top: -34px;
    left: 14px;
    margin-bottom: 0;
    width: 14px;
    height: 14px;
  }

  .page-about .about-timeline__node:first-child .about-timeline__dot {
    left: 0;
  }

  .page-about .about-versions__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-versions__aside {
    position: sticky;
    top: 24px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-identity__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__pledge-item {
    grid-template-columns: 104px 1fr;
  }

  .page-about .about-versions__layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

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

  .page-about .about-timeline__node:hover,
  .page-about .about-timeline__node:focus-visible {
    transform: none;
  }
}
<<<END>>>