.page-about {
  --about-marker: 44px;
  --about-dot: 30px;
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero-frame {
  padding: clamp(22px, 3.6vw, 44px);
}

.page-about .about-hero-frame .breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 0;
  font-size: clamp(1.95rem, 4.4vw, 3.2rem);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.012em;
  color: var(--bright);
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-hero-media {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-hero-media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- 锚点目录 ---------- */
.page-about .about-toc {
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-list a {
  display: inline-block;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

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

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.45rem, 2.7vw, 1.95rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--bright);
}

.page-about .about-head p {
  margin: 14px 0 0;
  max-width: 64ch;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-flow .prose p {
  color: var(--text);
}

.page-about .about-tail-link {
  margin: clamp(20px, 3vw, 30px) 0 0;
}

/* ---------- 起点侧栏 ---------- */
.page-about .about-facts {
  padding: clamp(18px, 2.4vw, 26px);
  border-left: 2px solid var(--orange);
}

.page-about .about-facts-title {
  margin: 0 0 16px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--bright);
}

.page-about .about-facts-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-facts-list li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 12px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-facts-key {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--amber);
  padding-top: 4px;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-marker) minmax(0, 1fr);
  gap: 0 14px;
  padding: 16px 14px 16px 0;
  border-radius: 2px;
  outline: none;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: calc(var(--about-marker) / 2 - 0.5px);
  top: calc(var(--about-dot) + 8px);
  bottom: -8px;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item:last-child::before {
  display: none;
}

.page-about .tl-dot {
  position: relative;
  z-index: 1;
  grid-column: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--about-dot);
  height: var(--about-dot);
  margin: 2px auto 0;
  border: 1px solid var(--line-soft);
  background: var(--panel);
  font-size: 0.72rem;
  color: var(--muted);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .tl-item--current .tl-dot {
  border-color: transparent;
  background: var(--grad);
  color: #08111b;
  font-weight: 700;
}

.page-about .tl-body {
  grid-column: 2;
}

.page-about .tl-era {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .tl-item--current .tl-era {
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 6px 0 0;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--bright);
}

.page-about .tl-sum {
  margin: 8px 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text);
}

.page-about .tl-more {
  max-height: 0;
  margin: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
  transition: max-height 200ms var(--ease), opacity 180ms var(--ease), margin 180ms var(--ease);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  background: var(--overlay);
}

.page-about .tl-item:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .tl-item:hover .tl-dot,
.page-about .tl-item:focus-visible .tl-dot,
.page-about .tl-item:focus-within .tl-dot {
  border-color: var(--orange);
  color: var(--bright);
}

.page-about .tl-item:not(.tl-item--current):hover .tl-dot,
.page-about .tl-item:not(.tl-item--current):focus-within .tl-dot {
  background: var(--panel);
}

.page-about .tl-item:not(.tl-item--current):hover .tl-dot {
  background: var(--overlay);
  color: var(--orange);
}

.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus-visible .tl-more,
.page-about .tl-item:focus-within .tl-more {
  max-height: 200px;
  margin-top: 8px;
  opacity: 1;
}

/* ---------- 产品原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 14px;
}

.page-about .principle {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-soft);
  background: var(--panel);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .principle:hover {
  transform: translateY(-3px);
  border-top-color: var(--orange);
}

.page-about .principle-index {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .principle-title {
  margin: 12px 0 0;
  font-size: 1.16rem;
  font-weight: 800;
  color: var(--bright);
}

.page-about .principle-text {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 团队 ---------- */
.page-about .about-team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-team-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 16px;
  border-left: 2px solid var(--line);
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.06), rgba(255, 107, 44, 0) 62%);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team-list li:hover {
  border-left-color: var(--cyan);
}

.page-about .team-name {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .team-desc {
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 本地连接 ---------- */
.page-about .about-nodes {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .node {
  position: relative;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .node::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 38%;
  height: 2px;
  background: var(--line-soft);
}

.page-about .node--accent::after {
  background: var(--grad);
}

.page-about .node-tag {
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--bright);
}

.page-about .node-text {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-local-stats {
  display: grid;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-local-stats .stat-num {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-local-stats .stat-label {
  margin-top: 4px;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-inline-link {
  margin: 18px 0 0;
  font-size: 0.94rem;
  color: var(--text);
}

.page-about .about-inline-link a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-team-media,
.page-about .about-node-media {
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-team-media img,
.page-about .about-node-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .partner-row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-key {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .partner-val {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  padding: clamp(22px, 3.4vw, 42px);
}

.page-about .about-cta-copy h2 {
  margin: 10px 0 0;
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  font-weight: 800;
  color: var(--bright);
}

.page-about .about-cta-copy p {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-local-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .partner-row {
    grid-template-columns: minmax(0, 160px) minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-team-list li {
    grid-template-columns: minmax(0, 110px) minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --about-marker: 52px;
    --about-dot: 32px;
  }

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

  .page-about .about-flow--flip > .about-flow-main {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-flow--flip > .about-flow-side {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .tl-item {
    padding-right: 20px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-cta-actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-more,
  .page-about .tl-item,
  .page-about .principle,
  .page-about .about-toc-list a,
  .page-about .tl-dot {
    transition: none;
  }

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