.page-about {
  --about-line: rgba(124, 146, 167, 0.18);
  background: var(--ink);
  color: var(--text);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 46px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::before {
  width: 560px;
  height: 560px;
  top: -230px;
  right: -150px;
  background: radial-gradient(circle, rgba(37, 224, 208, 0.2), transparent 68%);
}

.page-about .about-hero::after {
  width: 420px;
  height: 420px;
  bottom: -190px;
  left: -130px;
  background: radial-gradient(circle, rgba(255, 77, 157, 0.16), transparent 70%);
}

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

.page-about .hero-crumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .hero-copy {
  min-width: 0;
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.page-about .hero-version {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--faint);
  border-left: 1px solid var(--line);
  padding-left: 12px;
}

.page-about h1 {
  margin: 16px 0 20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.5rem, 8vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .hero-accent {
  color: var(--cyan);
}

.page-about .lede {
  max-width: 44ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.8;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--panel);
}

.page-about .fact-num {
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .fact-label {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--faint);
}

.page-about .hero-media {
  margin: 0;
  border: 1px solid var(--line);
}

/* ---------- 章节锚点 ---------- */
.page-about .chapter-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(7, 18, 31, 0.92);
  backdrop-filter: blur(10px);
}

.page-about .chapter-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .chapter-rail ol::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-rail a {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 13px;
  font-size: 0.84rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .chapter-rail a:hover,
.page-about .chapter-rail a:focus-visible {
  color: var(--text);
  border-bottom-color: var(--cyan);
  outline: none;
}

.page-about .chapter-rail .mono {
  font-size: 0.72rem;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(44px, 7vw, 92px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .section-grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: start;
}

.page-about .section-head {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
}

.page-about .section-head .mono-index {
  font-size: clamp(2.2rem, 5.4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(37, 224, 208, 0.85);
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .section-body {
  min-width: 0;
}

.page-about .section-body > p {
  max-width: 46ch;
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .section-body > p:last-child {
  margin-bottom: 0;
}

.page-about .section-body strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 做事原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .principle {
  padding: 20px 20px 20px 22px;
  background: var(--panel);
  border-left: 3px solid var(--cyan);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .principle:nth-child(2) {
  border-left-color: var(--magenta);
}

.page-about .principle:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .principle:hover {
  background: var(--layer);
  transform: translateX(4px);
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .principle p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.75;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 20px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta) 60%, rgba(255, 180, 84, 0.55));
  opacity: 0.55;
}

.page-about .timeline-node {
  position: relative;
  padding-left: 32px;
  outline: none;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .timeline-node:hover::before,
.page-about .timeline-node:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 224, 208, 0.18);
}

.page-about .timeline-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .node-year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .timeline-node h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .timeline-node p {
  margin: 0;
  max-width: 48ch;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.72;
}

.page-about .timeline-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .team-stats {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .team-stat {
  padding: 16px;
  background: var(--panel);
}

.page-about .team-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 2.6vw, 1.65rem);
  font-weight: 600;
  color: var(--cyan);
}

.page-about .team-stat span {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--faint);
}

.page-about .column-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .column-list li {
  padding: 7px 12px;
  border: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 24px;
}

.page-about .partner-copy {
  min-width: 0;
}

.page-about .partner-copy > p {
  max-width: 46ch;
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .service-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .service-item {
  padding: 16px 18px;
  background: var(--panel);
  transition: background 0.18s var(--ease);
}

.page-about .service-item:hover {
  background: var(--layer);
}

.page-about .service-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .service-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about .partner-cta {
  margin: 22px 0 0;
}

.page-about .partner-figure {
  margin: 0;
  border: 1px solid var(--line);
}

/* ---------- 数字与持续服务 ---------- */
.page-about .number-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .number-cell {
  padding: 18px 16px;
  background: linear-gradient(160deg, var(--panel), rgba(23, 50, 74, 0.55));
  border: 1px solid var(--line);
}

.page-about .number-value {
  display: block;
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .number-value i {
  font-style: normal;
  font-size: 0.58em;
  color: var(--cyan);
  margin-left: 2px;
}

.page-about .number-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--faint);
}

.page-about .cadence {
  margin: 26px 0;
  padding-left: 18px;
  border-left: 2px solid var(--amber);
  display: grid;
  gap: 10px;
}

.page-about .cadence p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .cadence strong {
  color: var(--text);
  font-weight: 600;
}

.page-about .about-cta {
  margin-top: 34px;
  padding: clamp(20px, 4vw, 32px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: rgba(14, 32, 51, 0.85);
  border: 1px solid var(--line-strong);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .team-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 940px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .section-grid {
    grid-template-columns: minmax(0, 0.36fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .section-head {
    position: sticky;
    top: calc(var(--header-h) + 74px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-rail a,
  .page-about .principle,
  .page-about .service-item,
  .page-about .timeline-node::before {
    transition: none;
  }

  .page-about .principle:hover {
    transform: none;
  }
}
<<<END>>>