.page-about {
  --about-shadow: 0 24px 60px rgba(3, 7, 16, .55);
  --about-inline: clamp(20px, 4vw, 34px);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 132px 0 72px;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(760px 420px at 88% 6%, rgba(53, 240, 160, .16), transparent 66%),
    radial-gradient(560px 380px at 4% 88%, rgba(255, 90, 43, .14), transparent 68%),
    linear-gradient(160deg, rgba(26, 42, 74, .72) 0%, rgba(7, 11, 20, 0) 58%);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(234, 241, 251, .16) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: .35;
  mask-image: linear-gradient(150deg, #000 0%, transparent 70%);
  -webkit-mask-image: linear-gradient(150deg, #000 0%, transparent 70%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb a {
  color: var(--muted);
  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(--neon);
  border-bottom-color: var(--neon);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  margin-top: 34px;
}

.page-about .about-hero__lead .eyebrow {
  color: var(--neon);
  letter-spacing: .22em;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.16;
  letter-spacing: -.01em;
  margin: 16px 0 20px;
  max-width: 15em;
}

.page-about .about-hero__lead .lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 34em;
  margin: 0 0 30px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  align-self: start;
}

.page-about .about-hero__stats .stat {
  background: var(--panel);
  padding: 22px 18px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  font-style: italic;
  letter-spacing: -.02em;
}

.page-about .about-hero__stats .stat__value--orange { color: var(--orange); }
.page-about .about-hero__stats .stat__value--cyan { color: var(--cyan); }
.page-about .about-hero__stats .stat__value--gold { color: var(--gold); }

.page-about .about-hero__stats .stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 运营脉络 ---------- */
.page-about .about-axis {
  position: relative;
}

.page-about .about-axis__head {
  display: grid;
  gap: 20px;
  margin-bottom: 40px;
}

.page-about .about-axis__head .eyebrow {
  color: var(--orange);
  letter-spacing: .2em;
}

.page-about .about-axis__desc {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: 42em;
}

.page-about .about-axis__media {
  margin: 0 0 40px;
}

.page-about .about-axis__filter {
  margin-bottom: 34px;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--cyan) 48%, rgba(255, 90, 43, .55) 78%, rgba(34, 48, 79, 0) 100%);
  opacity: .7;
}

.page-about .tl__item {
  position: relative;
  padding-left: 38px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 240, 160, .14);
  z-index: 1;
}

.page-about .tl__item[hidden],
.page-about .tl__item[data-filtered="false"] {
  display: none;
}

.page-about .tl__node {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color .24s var(--ease), background .24s var(--ease), transform .24s var(--ease);
}

.page-about .tl__node[open] {
  border-color: rgba(53, 240, 160, .5);
  background: linear-gradient(150deg, var(--panel-hi) 0%, var(--panel) 62%);
}

.page-about .tl__node:hover {
  transform: translateY(-2px);
}

.page-about .tl__sum {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 62px 1fr 22px;
  align-items: center;
  gap: 14px;
  padding: 18px var(--about-inline);
}

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

.page-about .tl__sum:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: var(--radius-md);
}

.page-about .tl__year {
  font-size: 15px;
  font-weight: 700;
  color: var(--neon);
  letter-spacing: .06em;
}

.page-about .tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
}

.page-about .tl__chev {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .tl__node[open] .tl__chev {
  transform: rotate(225deg) translate(-3px, -3px);
  border-color: var(--neon);
}

.page-about .tl__body {
  padding: 0 var(--about-inline) 20px;
  padding-left: calc(var(--about-inline) + 76px);
}

.page-about .tl__body p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 44em;
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions .section-head__title {
  max-width: 20em;
}

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

.page-about .ver-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px var(--about-inline) 28px;
  display: grid;
  gap: 12px;
  align-content: start;
  position: relative;
  overflow: hidden;
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .ver-card::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 240, 160, .2), transparent 70%);
  pointer-events: none;
}

.page-about .ver-card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 240, 160, .5);
}

.page-about .ver-card--current {
  border-color: rgba(255, 90, 43, .55);
  background: linear-gradient(155deg, rgba(255, 90, 43, .14) 0%, var(--panel) 58%);
}

.page-about .ver-card--current::after {
  background: radial-gradient(circle, rgba(255, 90, 43, .24), transparent 70%);
}

.page-about .ver-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ver-card__id {
  font-size: 26px;
  font-weight: 700;
  font-style: italic;
  letter-spacing: -.02em;
  color: var(--neon);
  line-height: 1;
}

.page-about .ver-card__id--cyan { color: var(--cyan); }
.page-about .ver-card__id--gold { color: var(--gold); }
.page-about .ver-card__id--orange { color: var(--orange); }

.page-about .ver-card__era {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .ver-card .h-card {
  margin: 0;
}

.page-about .ver-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 资料维护 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-flow__body .eyebrow {
  color: var(--cyan);
  letter-spacing: .2em;
}

.page-about .about-flow__body .h-section {
  max-width: 18em;
}

.page-about .about-flow__body > p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 38em;
  margin: 0 0 28px;
}

.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .flow-steps__item {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  align-items: start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .flow-steps__item:hover {
  background: var(--panel-hi);
  border-left-color: var(--neon);
}

.page-about .flow-steps__idx {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .08em;
  padding-top: 3px;
}

.page-about .flow-steps__item .h-card {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .flow-steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team .section-head__title {
  max-width: 22em;
}

.page-about .team-track {
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .team-node {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  display: grid;
  gap: 10px;
  align-content: start;
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .team-node:hover {
  transform: translateY(-4px);
  border-color: var(--neon);
}

.page-about .team-node__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--neon);
  font-weight: 700;
}

.page-about .team-node--cyan .team-node__num { color: var(--cyan); }
.page-about .team-node--gold .team-node__num { color: var(--gold); }
.page-about .team-node--orange .team-node__num { color: var(--orange); }

.page-about .team-node .h-card {
  margin: 0;
  font-size: 18px;
}

.page-about .team-node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-node__out {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text);
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  opacity: .85;
}

.page-about .team-node--cyan .team-node__out { color: var(--cyan); }
.page-about .team-node--gold .team-node__out { color: var(--gold); }
.page-about .team-node--orange .team-node__out { color: var(--orange); }

.page-about .about-team__media {
  margin: 28px 0 0;
}

/* ---------- 三条做法 ---------- */
.page-about .about-pledge .section-head__title {
  max-width: 18em;
}

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

.page-about .pledge-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px var(--about-inline) 30px;
  display: grid;
  gap: 12px;
  align-content: start;
  overflow: hidden;
}

.page-about .pledge-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--neon);
}

.page-about .pledge-card--cyan::before { background: var(--cyan); }
.page-about .pledge-card--orange::before { background: var(--orange); }

.page-about .pledge-card__mark {
  font-size: 34px;
  font-weight: 700;
  font-style: italic;
  letter-spacing: -.03em;
  color: var(--neon);
  line-height: 1;
  opacity: .85;
}

.page-about .pledge-card--cyan .pledge-card__mark { color: var(--cyan); }
.page-about .pledge-card--orange .pledge-card__mark { color: var(--orange); }

.page-about .pledge-card .h-card {
  margin: 0;
}

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

/* ---------- 合作与反馈 ---------- */
.page-about .about-partner__panel {
  background: linear-gradient(150deg, var(--panel-hi) 0%, var(--panel) 52%, var(--bg) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px var(--about-inline) 34px;
  display: grid;
  gap: 30px;
  box-shadow: var(--about-shadow);
  position: relative;
  overflow: hidden;
}

.page-about .about-partner__panel::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -100px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(53, 240, 160, .16), transparent 70%);
  pointer-events: none;
}

.page-about .about-partner__lead .eyebrow {
  color: var(--neon);
  letter-spacing: .2em;
}

.page-about .about-partner__lead .h-section {
  max-width: 16em;
}

.page-about .about-partner__lead > p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 18px;
  max-width: 40em;
}

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

.page-about .about-partner__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

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

.page-about .about-partner__note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
  max-width: 42em;
}

.page-about .about-partner__note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 160, .4);
  transition: border-color .2s var(--ease);
}

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

.page-about .about-partner__cta {
  display: grid;
  gap: 12px;
  align-content: start;
  position: relative;
  z-index: 1;
}

.page-about .about-partner__cta-label {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--muted);
  margin: 0 0 2px;
}

.page-about .about-partner__cta .btn {
  justify-content: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .pledge-card:last-child {
    grid-column: 1 / -1;
  }

  .page-about .about-partner__panel {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 168px 0 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

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

  .page-about .about-axis__head {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .tl__item {
    padding-left: 52px;
  }

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

  .page-about .tl__item::before {
    left: 15px;
    top: 26px;
  }

  .page-about .tl__sum {
    grid-template-columns: 84px 1fr 24px;
    gap: 22px;
    padding: 22px var(--about-inline);
  }

  .page-about .tl__year {
    font-size: 17px;
  }

  .page-about .tl__title {
    font-size: 18px;
  }

  .page-about .tl__body {
    padding-left: calc(var(--about-inline) + 106px);
    padding-bottom: 24px;
  }

  .page-about .ver-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-flow__media {
    margin-top: 12px;
  }

  .page-about .team-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 2px solid var(--line);
    padding-top: 0;
  }

  .page-about .team-node {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 30px 22px 26px;
    border-right: 1px solid var(--line);
  }

  .page-about .team-node:last-child {
    border-right: 0;
  }

  .page-about .team-node::before {
    content: "";
    position: absolute;
    top: -9px;
    left: 22px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg);
    border: 2px solid var(--neon);
  }

  .page-about .team-node--cyan::before { border-color: var(--cyan); }
  .page-about .team-node--gold::before { border-color: var(--gold); }
  .page-about .team-node--orange::before { border-color: var(--orange); }

  .page-about .team-node:hover {
    transform: translateY(-4px);
    border-color: var(--line);
    background: rgba(26, 42, 74, .5);
  }

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

  .page-about .pledge-card:last-child {
    grid-column: auto;
  }

  .page-about .about-partner__panel {
    padding: 48px 54px 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__node,
  .page-about .ver-card,
  .page-about .team-node,
  .page-about .tl__chev,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .tl__node:hover,
  .page-about .ver-card:hover,
  .page-about .team-node:hover {
    transform: none;
  }
}
<<<END>>>
</main>