.page-about {
  --spine: 44px;
  --about-line: rgba(88, 184, 232, .6);
  --about-measure: 34em;
  background: var(--snow);
  color: var(--ink);
}

/* 面包屑 */
.page-about .about-crumbs {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px var(--gutter) 0;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px var(--gutter) 44px;
}

.page-about .hero-frame {
  position: relative;
  padding: 30px 20px 28px;
  border: 1px solid rgba(201, 214, 226, .3);
  background:
    radial-gradient(120% 100% at 92% 4%, rgba(27, 111, 168, .45), transparent 58%),
    linear-gradient(180deg, var(--ice-night), var(--glacier));
  color: var(--snow);
  overflow: hidden;
  box-shadow: 0 30px 70px -40px rgba(10, 27, 42, .8);
}

.page-about .hero-frame::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, rgba(88, 184, 232, .75) 0 2px, transparent 2px 13px);
  opacity: .85;
}

.page-about .hero-frame::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -110px;
  width: 300px;
  height: 300px;
  border: 1px solid rgba(88, 184, 232, .22);
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, rgba(232, 112, 26, .16), transparent 68%);
  pointer-events: none;
}

.page-about .hero-corner {
  position: absolute;
  width: 15px;
  height: 15px;
  border: 1px solid var(--ice-bright);
  opacity: .7;
}

.page-about .hero-corner--tl { top: 14px; left: 14px; border-right: 0; border-bottom: 0; }
.page-about .hero-corner--tr { top: 14px; right: 14px; border-left: 0; border-bottom: 0; }
.page-about .hero-corner--bl { bottom: 14px; left: 14px; border-right: 0; border-top: 0; }
.page-about .hero-corner--br { bottom: 14px; right: 14px; border-left: 0; border-top: 0; }

.page-about .hero-eyebrow {
  position: relative;
  margin: 0;
  color: var(--ice-bright);
  letter-spacing: .2em;
}

.page-about .about-hero h1 {
  position: relative;
  margin: 14px 0 0;
  max-width: 13em;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: var(--fs-h1);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .hero-lead {
  position: relative;
  margin: 18px 0 0;
  max-width: var(--about-measure);
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .hero-stats {
  position: relative;
  list-style: none;
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(201, 214, 226, .2);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 16px 20px;
}

.page-about .hero-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .hero-stat .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1;
  color: var(--orange);
}

.page-about .hero-stat .stat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist);
}

/* ---------- 纵向流程线 ---------- */
.page-about .flow {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 4px var(--gutter) 0 var(--spine);
}

.page-about .flow::before {
  content: "";
  position: absolute;
  z-index: 2;
  top: 0;
  bottom: 0;
  left: calc(var(--spine) - 24px);
  width: 2px;
  background-image: repeating-linear-gradient(180deg, var(--about-line) 0 8px, transparent 8px 17px);
  pointer-events: none;
}

.page-about .flow-stop {
  position: relative;
  padding: 34px 0 40px;
}

.page-about .stop-node {
  position: absolute;
  left: -34px;
  top: 36px;
  width: 20px;
  height: 20px;
  border: 1px solid var(--ice-blue);
  background: var(--snow);
  box-shadow: inset 0 0 0 4px rgba(88, 184, 232, .22);
}

.page-about .stop-node::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  width: 14px;
  height: 0;
  border-top: 1px dashed rgba(27, 111, 168, .5);
}

.page-about .stop-num {
  margin: 0 0 8px;
  color: var(--ice-blue);
  letter-spacing: .18em;
}

.page-about .flow-stop h2 {
  margin: 0 0 14px;
  max-width: 16em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-h2);
  line-height: 1.08;
  letter-spacing: -.02em;
}

.page-about .flow-stop h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-h3);
  line-height: 1.15;
  letter-spacing: -.01em;
}

.page-about .stop-lead {
  margin: 0 0 24px;
  max-width: var(--about-measure);
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .prose {
  max-width: var(--about-measure);
  font-size: var(--fs-body);
  line-height: 1.78;
}

.page-about .prose p {
  margin: 0 0 1em;
  color: var(--graphite);
}

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

/* 图片 */
.page-about .figure-frame {
  margin: 0;
  background: var(--glacier);
  overflow: hidden;
}

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

.page-about .figure-caption {
  margin-top: 9px;
  color: var(--graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
}

/* ---------- 01 品牌主张 ---------- */
.page-about .claim-grid {
  display: grid;
  gap: 24px;
  align-items: start;
}

.page-about .claim-figure { margin-top: 2px; }

/* ---------- 02 团队构成 ---------- */
.page-about .team-figure { margin-bottom: 30px; }

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

.page-about .team-card {
  padding: 20px 18px 22px;
  background: linear-gradient(180deg, #ffffff, var(--snow));
  border-top: 3px solid var(--ice-blue);
}

.page-about .team-card--raise { border-top-color: var(--orange); }

.page-about .team-card:last-child { border-top-color: var(--grass); }

.page-about .team-code {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--graphite);
}

.page-about .team-role { color: var(--ink); }

.page-about .team-count {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--ice-blue);
}

.page-about .team-count .num {
  font-size: 26px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--graphite);
}

.page-about .team-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 9px;
}

.page-about .team-list li:last-child { margin-bottom: 0; }

.page-about .team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--ice-bright);
}

/* ---------- 03 内容体系 ---------- */
.page-about .dataline-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .dataline {
  display: grid;
  gap: 10px;
  padding: 20px 18px;
  background: #ffffff;
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--ice-bright);
}

.page-about .dataline:nth-child(2) { border-left-color: var(--orange); }
.page-about .dataline:nth-child(3) { border-left-color: var(--grass); }
.page-about .dataline:nth-child(4) { border-left-color: var(--ice-blue); }

.page-about .dataline-index {
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--graphite);
}

.page-about .dataline-body h3 { color: var(--ink); }

.page-about .dataline-body p {
  margin: 0 0 10px;
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .dataline-meta {
  margin: 0 0 14px;
  color: var(--ice-blue);
  letter-spacing: .1em;
}

/* ---------- 04 更新节奏（深色段） ---------- */
.page-about .about-dark {
  margin: 0 0 30px;
  padding: 28px 20px 30px;
  border: 1px solid rgba(201, 214, 226, .18);
  background:
    radial-gradient(90% 70% at 100% 0%, rgba(27, 111, 168, .38), transparent 62%),
    linear-gradient(180deg, var(--ice-night), var(--glacier));
  color: var(--mist);
}

.page-about .about-dark .stop-node { background: var(--ice-night); }
.page-about .about-dark .stop-num { color: var(--ice-bright); }
.page-about .about-dark h2,
.page-about .about-dark h3 { color: var(--snow); }
.page-about .about-dark .stop-lead { color: var(--mist); }
.page-about .about-dark .figure-caption { color: var(--mist); }

.page-about .about-timeline {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  border-left: 1px solid rgba(201, 214, 226, .26);
}

.page-about .about-timeline .timeline-item {
  position: relative;
  padding: 0 0 22px 22px;
}

.page-about .about-timeline .timeline-item:last-child { padding-bottom: 0; }

.page-about .about-timeline .timeline-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--ice-bright);
  background: var(--ice-night);
}

.page-about .about-timeline .timeline-item[data-state="current"]::before {
  background: var(--score);
  border-color: var(--score);
}

.page-about .about-timeline .timeline-item[data-state="done"]::before {
  background: var(--grass);
  border-color: var(--grass);
}

.page-about .about-timeline .timeline-item .micro {
  margin: 0 0 4px;
  color: var(--ice-bright);
  letter-spacing: .16em;
}

.page-about .about-timeline .timeline-item p {
  margin: 0;
  max-width: var(--about-measure);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-archive { margin-top: 4px; }

/* ---------- 05 发展节点 ---------- */
.page-about .about-tabs {
  display: flex;
  gap: 8px;
  margin: 4px 0 0;
  padding: 4px 2px 14px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-light);
  scrollbar-width: thin;
}

.page-about .about-tabs .tab {
  flex: 0 0 auto;
  padding: 9px 16px;
  border: 1px solid var(--mist);
  border-radius: var(--pill);
  background: transparent;
  color: var(--graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-tabs .tab:hover {
  border-color: var(--ice-bright);
  color: var(--ice-blue);
}

.page-about .about-tabs .tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--snow);
}

.page-about .about-tabs .tab:focus-visible {
  outline: 2px solid var(--ice-bright);
  outline-offset: 2px;
}

.page-about .about-panel { padding: 22px 0 0; }
.page-about .about-panel[hidden] { display: none; }

.page-about .stage-tag {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .stage-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  max-width: var(--about-measure);
}

.page-about .stage-list li {
  position: relative;
  padding: 0 0 0 20px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .stage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .66em;
  width: 10px;
  height: 2px;
  background: var(--ice-bright);
}

/* ---------- 06 合作与互认 ---------- */
.page-about .coop-grid {
  display: grid;
  gap: 16px;
  margin-top: 6px;
}

.page-about .coop-item {
  padding: 20px 18px 22px;
  background: #ffffff;
  border: 1px solid var(--line-light);
  border-top: 1px dashed rgba(27, 111, 168, .5);
}

.page-about .coop-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .coop-item a {
  color: var(--ice-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .coop-item a:hover { color: var(--orange); }

/* ---------- 收尾行动带 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 10px;
  padding: 40px var(--gutter) 48px;
  background: linear-gradient(180deg, var(--glacier), var(--ice-night));
  color: var(--snow);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, rgba(88, 184, 232, .7) 0 2px, transparent 2px 13px);
}

.page-about .cta-inner {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
}

.page-about .cta-eyebrow { margin: 0 0 8px; color: var(--ice-bright); letter-spacing: .2em; }

.page-about .about-cta h2 {
  margin: 0 0 12px;
  max-width: 18em;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: var(--fs-h2);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--snow);
}

.page-about .cta-lead {
  margin: 0 0 22px;
  max-width: var(--about-measure);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about { --spine: 76px; }

  .page-about .hero-frame { padding: 44px 44px 40px; }
  .page-about .flow-stop { padding: 44px 0 52px; }
  .page-about .stop-node { top: 46px; }

  .page-about .claim-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    gap: 36px;
  }

  .page-about .dataline {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 26px;
    padding: 24px 26px;
  }

  .page-about .about-dark { padding: 36px 34px 38px; }

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

  .page-about .about-cta { padding: 52px var(--gutter) 58px; }
}

@media (min-width: 1040px) {
  .page-about { --spine: 96px; }

  .page-about .team-grid {
    grid-template-columns: 1fr 1.12fr 1.28fr;
    align-items: start;
    gap: 22px;
    margin-top: 40px;
  }

  .page-about .team-card--raise { transform: translateY(-24px); }

  .page-about .flow-stop { padding: 52px 0 60px; }
  .page-about .stop-node { top: 54px; }
}
<<<END>>>