.page-about {
  --about-rail: 28px;
  --about-panel-accent: var(--cyan);
  display: block;
  background: var(--arena-900);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .mission-hero {
  position: relative;
  padding: clamp(20px, 3.4vw, 40px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(110% 82% at 86% -8%, rgba(43, 227, 242, 0.14), transparent 62%),
    radial-gradient(78% 62% at 2% 6%, rgba(255, 122, 47, 0.09), transparent 62%);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

.page-about .breadcrumb a {
  color: var(--ink-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.page-about .mission-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(38px, 6.2vw, 76px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .hero-lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.35vw, 16.5px);
  line-height: 1.78;
  color: var(--ink-muted);
}

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

.page-about .hero-actions .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-pill);
}

.page-about .hero-actions .btn-primary {
  background: var(--orange);
  color: var(--arena-900);
  border: 1px solid var(--orange);
}

.page-about .hero-actions .btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--hairline);
}

.page-about .hero-actions .btn-ghost:hover,
.page-about .hero-actions .btn-ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 18px;
  margin: 30px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
}

.page-about .hero-facts dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

.page-about .hero-facts dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 500;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-media {
  margin: 0;
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-hair);
  filter: contrast(1.06) saturate(0.96);
}

.page-about .hero-media figcaption {
  margin-top: 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

/* ---------- 通用区块 ---------- */
.page-about .mission-section {
  position: relative;
  padding: clamp(46px, 6vw, 86px) 0;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 3.2vw, 40px);
}

.page-about .section-head--flush {
  margin-bottom: 0;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .section-lede {
  max-width: 62ch;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-muted);
}

/* ---------- 缘起 ---------- */
.page-about .why-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .why-body {
  display: grid;
  gap: 16px;
}

.page-about .why-body p {
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-muted);
  max-width: 66ch;
}

.page-about .why-body p:first-child {
  color: var(--ink);
  font-size: 16px;
}

/* ---------- 三条业务线：分段切换 ---------- */
.page-about .segmented {
  margin-top: 6px;
  padding-top: 22px;
  border-top: 1px solid var(--hairline);
}

.page-about .segmented-track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .segmented-track::-webkit-scrollbar {
  display: none;
}

.page-about .seg-button {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--ink-muted);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .seg-button:hover {
  color: var(--ink);
  border-color: var(--steel);
}

.page-about .seg-button[aria-selected="true"] {
  color: var(--arena-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .seg-button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .seg-panel {
  margin-top: 28px;
  padding-top: 26px;
  border-top: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  animation: about-panel-in var(--dur-base) var(--ease) both;
}

.page-about .seg-panel[hidden] {
  display: none;
}

@keyframes about-panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about #line-panel-1 {
  --about-panel-accent: var(--cyan);
}

.page-about #line-panel-2 {
  --about-panel-accent: var(--orange);
}

.page-about #line-panel-3 {
  --about-panel-accent: var(--green);
}

.page-about .panel-lead {
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
  max-width: 62ch;
  padding-left: 14px;
  border-left: 2px solid var(--about-panel-accent);
}

.page-about .panel-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .panel-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--ink-muted);
}

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

.page-about .panel-cta {
  margin: 4px 0 0;
}

.page-about .panel-cta .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.page-about .panel-cta .btn:hover,
.page-about .panel-cta .btn:focus-visible {
  border-color: var(--about-panel-accent);
  color: var(--about-panel-accent);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-banner {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .timeline-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 6px 0 6px var(--about-rail);
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(43, 227, 242, 0.32) 44%, rgba(36, 54, 90, 0.9) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 36px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail) * -1);
  top: 12px;
  width: 11px;
  height: 11px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--arena-900);
  border: 1px solid var(--steel);
  transition: background var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}

.page-about .tl-item.is-in::before {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 0 5px rgba(77, 240, 138, 0.14);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-item p {
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--hairline);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-about .team-cell {
  background: var(--arena-900);
  padding: 26px 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 100%;
}

.page-about .team-index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .team-cell h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .team-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-muted);
}

.page-about .team-size {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 500;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

/* ---------- 数据来源色带 ---------- */
.page-about .mission-band {
  position: relative;
  padding: clamp(46px, 6.5vw, 92px) 0;
  background: var(--arena-800);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-about .mission-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(64% 58% at 6% 0%, rgba(43, 227, 242, 0.1), transparent 62%);
  pointer-events: none;
}

.page-about .mission-band .shell {
  position: relative;
  z-index: 1;
}

.page-about .data-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: center;
}

.page-about .data-copy {
  display: grid;
  gap: 16px;
}

.page-about .data-copy p {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-muted);
}

.page-about .data-media {
  margin: 0;
}

.page-about .data-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
}

.page-about .data-fields {
  list-style: none;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}

.page-about .data-fields li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 15px 14px;
  background: var(--arena-800);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .data-fields li::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  scrollbar-width: none;
}

.page-about .partner-grid::-webkit-scrollbar {
  display: none;
}

.page-about .partner-cell {
  background: var(--arena-900);
  padding: 22px 18px 24px;
}

.page-about .partner-cell h3 {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .partner-cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-muted);
}

.page-about .partner-note {
  margin: 26px 0 0;
  max-width: 68ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink-muted);
}

.page-about .partner-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 242, 0.45);
}

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

/* ---------- 下一步 ---------- */
.page-about .mission-next {
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.page-about .next-links li {
  border-bottom: 1px solid var(--hairline);
}

.page-about .next-links a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 18px;
  min-height: 44px;
  padding: 18px 4px;
  text-decoration: none;
  transition: padding-left var(--dur-fast) var(--ease);
}

.page-about .next-links a::after {
  content: "→";
  margin-left: auto;
  align-self: center;
  font-family: var(--font-data);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  padding-left: 10px;
}

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

.page-about .link-name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
  transition: color var(--dur-fast) var(--ease);
}

.page-about .link-note {
  flex: 1 1 200px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-muted);
}

.page-about .next-links a:hover .link-name,
.page-about .next-links a:focus-visible .link-name {
  color: var(--cyan);
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .seg-panel {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

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

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

@media (min-width: 920px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .why-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about .data-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
  }

  .page-about .next-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .data-fields {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .seg-panel {
    animation: none;
  }

  .page-about .next-links a {
    transition: none;
  }
}
<<<END>>>