.page-about {
  --about-ease: var(--ease);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: 88px;
}

.page-about .wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 20px;
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 32px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}
.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color .18s var(--about-ease);
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
}
.page-about .about-crumb-sep {
  color: var(--line);
}

/* 首屏 */
.page-about .about-hero {
  padding: 36px 0 52px;
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 16ch;
  font-size: clamp(32px, 6.4vw, 62px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.02em;
}
.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.9;
  color: var(--muted);
}
.page-about .about-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--muted);
}

/* 分屏骨架 */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  border-top: 1px solid var(--line);
  padding-top: 40px;
}
.page-about .about-canvas {
  min-width: 0;
}
@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 64px;
    padding-top: 56px;
  }
}

/* 左侧索引轨道 */
.page-about .about-rail {
  min-width: 0;
}
@media (min-width: 940px) {
  .page-about .about-rail {
    position: sticky;
    top: 32px;
    align-self: start;
  }
}
.page-about .about-rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--stone);
}
.page-about .about-rail-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-rail-list::-webkit-scrollbar {
  display: none;
}
@media (min-width: 940px) {
  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
}
.page-about .about-rail-list > li {
  flex: 0 0 auto;
}
@media (min-width: 940px) {
  .page-about .about-rail-list > li {
    flex: initial;
  }
}
.page-about .about-rail-list a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--about-ease), border-color .18s var(--about-ease), background-color .18s var(--about-ease);
}
@media (min-width: 940px) {
  .page-about .about-rail-list a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 10px 0 10px 14px;
    white-space: normal;
  }
}
.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(56, 224, 216, .07);
  outline: none;
}
.page-about .about-rail-list a:focus-visible {
  box-shadow: 0 0 0 2px rgba(56, 224, 216, .45);
}
.page-about .about-rail-years {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--gold);
}
.page-about .about-rail-name {
  font-size: 14px;
  line-height: 1.4;
}
.page-about .about-rail-foot {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--stone);
}
.page-about .about-rail-foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 224, 216, .35);
}

/* 章节通用结构 */
.page-about .about-sec {
  padding-bottom: 60px;
  scroll-margin-top: 28px;
}
.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line);
  padding-top: 56px;
}
.page-about .about-sec-head {
  margin: 0 0 22px;
}
.page-about .about-sec-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}
.page-about .about-sec h2 {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 32px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -0.015em;
}
.page-about .about-sec > p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
}
.page-about .about-linkline {
  margin: 22px 0 0;
}
.page-about .about-link {
  display: inline-block;
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 224, 216, .4);
  padding-bottom: 2px;
  transition: color .18s var(--about-ease), border-color .18s var(--about-ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--gold);
  border-color: rgba(232, 180, 74, .6);
}

/* 数字组 */
.page-about .stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
@media (min-width: 720px) {
  .page-about .stat-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .stat {
  background: var(--ink);
  padding: 22px 18px;
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.8vw, 36px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--cyan);
}
.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 图片容器 */
.page-about figure {
  margin: 0;
}
.page-about .about-figure {
  margin: 8px 0 0;
}
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}
.page-about .about-figure img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  background: var(--panel);
}

/* 阶段筛选 */
.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 30px 0 8px;
}
.page-about .about-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-chip {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: color .18s var(--about-ease), border-color .18s var(--about-ease), background-color .18s var(--about-ease);
}
.page-about .about-chip:hover {
  color: var(--paper);
  border-color: var(--stone);
}
.page-about .about-chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.page-about .about-chip[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}
.page-about .about-filter-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* 阶段条目 */
.page-about .stage-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}
.page-about .stage-item {
  display: grid;
  gap: 10px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 28px;
}
.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .stage-item[hidden] {
  display: none;
}
@media (min-width: 720px) {
  .page-about .stage-item {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}
.page-about .stage-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .stage-years {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--gold);
}
.page-about .stage-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.4;
}
.page-about .stage-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .stage-item:target {
  background: rgba(56, 224, 216, .05);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}
@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    gap: 44px;
    align-items: start;
  }
}
.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .role-item {
  padding: 18px 0 20px;
  border-top: 1px solid var(--line);
}
.page-about .role-item:last-child {
  border-bottom: 1px solid var(--line);
}
.page-about .role-key {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about .role-name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.5;
}
.page-about .role-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-figure--side {
  margin-top: 0;
}

/* 维护标准 */
.page-about .rule-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (min-width: 760px) {
  .page-about .rule-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .rule-item {
  background: var(--panel);
  padding: 22px 20px;
}
.page-about .rule-item h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: 0.01em;
}
.page-about .rule-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

/* 生态 */
.page-about .eco-row {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
@media (min-width: 780px) {
  .page-about .eco-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .eco-cell {
  background: var(--track);
  padding: 24px 20px;
}
.page-about .eco-num {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -0.01em;
}
.page-about .eco-label {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* 结尾行动区 */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(56, 224, 216, .12), transparent 58%),
    radial-gradient(110% 130% at 100% 100%, rgba(232, 180, 74, .1), transparent 60%),
    var(--panel);
}
@media (min-width: 780px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 34px 36px;
  }
}
.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-size: clamp(20px, 2.6vw, 24px);
  font-weight: 900;
  letter-spacing: -0.01em;
}
.page-about .about-cta p {
  margin: 0;
  max-width: 48ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}
.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 减弱动效 */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-chip,
  .page-about .about-link,
  .page-about .about-rail-list a,
  .page-about .breadcrumbs a {
    transition: none;
  }
}
<<<END>>>