.page-about {
  background: var(--night);
  color: var(--text);
  padding-bottom: clamp(40px, 6vw, 80px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 40px) 0 clamp(40px, 7vw, 96px);
  border-bottom: var(--edge) solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon), transparent);
  opacity: 0.45;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(24px, 4vw, 56px);
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(42px, 9.4vw, 118px);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 40ch;
  color: var(--muted);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__side {
  position: relative;
  border: var(--edge) solid var(--line);
  background: var(--panel);
  padding: 20px 18px;
  box-shadow: 6px 6px 0 var(--shadow);
}

.page-about .about-hero__side .annotation {
  position: absolute;
  top: 18px;
  right: 12px;
}

.page-about .stat-strip {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stat-strip li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .stat-strip li:last-child {
  border-bottom: 0;
}

.page-about .stat-num {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: -0.01em;
  min-width: 5.5em;
}

.page-about .stat-unit {
  font-size: 0.52em;
  margin-left: 3px;
  color: var(--teal);
}

.page-about .stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 通用小节头 ---------- */
.page-about .section-head {
  max-width: 62ch;
}

.page-about .section-head h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(27px, 4.2vw, 50px);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-about .section-lede {
  margin: 0;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .team-card {
  padding: 22px 20px;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--neon);
  box-shadow: 8px 8px 0 var(--shadow);
}

.page-about .team-card__count {
  display: block;
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
  letter-spacing: -0.02em;
}

.page-about .team-card__count::after {
  content: "人";
  margin-left: 6px;
  font-size: 14px;
  color: var(--muted);
}

.page-about .team-card h3 {
  margin: 14px 0 8px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-card__scope {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px !important;
  color: var(--text) !important;
  opacity: 0.82;
}

.page-about .team-media {
  margin: clamp(36px, 5vw, 64px) 0 0;
}

.page-about .team-media figcaption,
.page-about .flow-media figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 流程 ---------- */
.page-about .flow-line {
  display: block;
  width: 100%;
  height: clamp(56px, 9vw, 110px);
  margin: clamp(26px, 4vw, 46px) 0 clamp(20px, 3vw, 32px);
}

.page-about .flow-line polyline {
  fill: none;
  stroke: var(--neon);
  stroke-width: 2;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.page-about .flow-line circle {
  fill: var(--night);
  stroke: var(--teal);
  stroke-width: 2;
}

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

.page-about .flow-step {
  border: var(--edge) solid var(--line);
  background: var(--panel);
  box-shadow: 5px 5px 0 var(--shadow);
  transition: border-color 180ms var(--ease);
}

.page-about .flow-step[open] {
  border-color: var(--neon);
}

.page-about .flow-step summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 16px 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .flow-step summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-step__no {
  font-size: 13px;
  color: var(--neon);
  letter-spacing: 0.08em;
}

.page-about .flow-step__name {
  font-size: 16.5px;
  font-weight: 600;
}

.page-about .flow-step__body {
  padding: 0 16px 18px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .flow-step__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow-step__time {
  margin-top: 10px !important;
  color: var(--amber) !important;
  font-size: 13px !important;
  letter-spacing: 0.04em;
}

.page-about .flow-media {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-layout {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .timeline-rail h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.08;
}

.page-about .timeline-rail p {
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .rail-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  border-top: var(--edge) solid var(--line);
}

.page-about .rail-facts li {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

.page-about .rail-facts .mono {
  color: var(--neon);
  font-size: 15px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--teal) 55%, transparent);
}

.page-about .timeline-node {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--neon);
  border-radius: 50%;
  background: var(--night);
}

.page-about .timeline-year {
  margin: 0;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  color: var(--neon);
  letter-spacing: 0.03em;
  line-height: 1;
}

.page-about .timeline-node h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 600;
}

.page-about .timeline-node p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
  max-width: 46ch;
}

.page-about .timeline-media {
  list-style: none;
  padding-bottom: clamp(26px, 4vw, 42px);
  max-width: 420px;
}

/* ---------- 产品思路 ---------- */
.page-about .craft-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .craft-card {
  padding: 22px 20px;
}

.page-about .craft-card .tag {
  margin-bottom: 14px;
}

.page-about .craft-card h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 700;
  line-height: 1.25;
}

.page-about .craft-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .craft-card--lead {
  border-color: var(--teal);
  background: linear-gradient(160deg, var(--panel), var(--deep));
}

.page-about .craft-card--lead h3 {
  font-size: clamp(24px, 3vw, 36px);
  font-family: var(--font-display);
}

.page-about .craft-note {
  margin-top: 16px !important;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--neon) !important;
  font-size: 13px !important;
  letter-spacing: 0.03em;
}

/* ---------- 链路与数据管理 ---------- */
.page-about .ops-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .ops-col {
  padding: clamp(20px, 3vw, 30px);
  border: var(--edge) solid var(--line);
  background: var(--deep);
  box-shadow: 6px 6px 0 var(--shadow);
}

.page-about .ops-col--link {
  border-top: 6px solid var(--neon);
}

.page-about .ops-col--data {
  border-top: 6px solid var(--violet);
}

.page-about .ops-col h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.1;
}

.page-about .ops-col p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .ops-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .ops-list li {
  position: relative;
  padding: 9px 0 9px 20px;
  font-size: 14px;
  color: var(--text);
  border-bottom: 1px solid var(--line);
}

.page-about .ops-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon);
}

.page-about .ops-col--data .ops-list li::before {
  background: var(--violet);
}

/* ---------- 协作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  padding: 20px 18px;
  border-left: 3px solid var(--line);
  background: var(--deep);
}

.page-about .eco-item:hover {
  border-left-color: var(--neon);
}

.page-about .eco-no {
  grid-row: span 2;
  font-size: 22px;
  font-weight: 700;
  color: var(--teal);
  line-height: 1.1;
}

.page-about .eco-item h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.page-about .eco-item p {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .eco-note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 16px 18px;
  border: 1px dashed var(--line);
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  border-bottom: 0;
}

.page-about .next-inner h2 {
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.08;
}

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

.page-about .next-note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.03em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .craft-card--wide {
    grid-column: span 2;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .timeline-rail {
    position: sticky;
    top: clamp(84px, 12vh, 120px);
  }

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

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

  .page-about .team-card:nth-child(even) {
    transform: translateY(20px);
  }

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

  .page-about .craft-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-areas:
      "lead lead side1"
      "lead lead side2"
      "wide wide wide";
  }

  .page-about .craft-card--lead {
    grid-area: lead;
  }

  .page-about .craft-card--wide {
    grid-area: wide;
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .flow-step,
  .page-about .eco-item {
    transition: none;
  }
}
<<<END>>>