.page-about {
  display: block;
  padding-bottom: clamp(64px, 9vw, 120px);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(880px 420px at 10% -12%, rgba(43, 232, 181, .13), transparent 62%),
    radial-gradient(700px 380px at 94% 6%, rgba(255, 177, 60, .11), transparent 60%);
}
.page-about .about-hero > .shell {
  position: relative;
}
.page-about .about-hero h1 {
  margin: 20px 0 0;
  max-width: 17ch;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(38px, 6.4vw, 92px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper);
}
.page-about .about-lead {
  margin: 26px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 首屏数字 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 42px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--neon);
}
.page-about .stat-num.is-gold {
  color: var(--gold);
}
.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 首屏图 ---------- */
.page-about .about-hero-figure {
  position: relative;
  margin: clamp(28px, 4vw, 48px) 0 0;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  overflow: hidden;
  background: linear-gradient(155deg, var(--court), var(--ink));
}
.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 32vw, 480px);
  object-fit: cover;
}
.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(5, 7, 13, .06) 0%, rgba(5, 7, 13, .72) 100%),
    repeating-linear-gradient(180deg, rgba(43, 232, 181, .06) 0 1px, transparent 1px 42px);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  padding-top: clamp(40px, 6vw, 84px);
}

/* ---------- 章节索引 ---------- */
.page-about .toc-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--steel);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.page-about .toc {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}
.page-about .toc::-webkit-scrollbar {
  display: none;
}
.page-about .toc-link {
  flex: 0 0 auto;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--steel);
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}
.page-about .toc-link:hover {
  color: var(--paper);
  border-color: var(--line-2);
}
.page-about .toc-link[aria-current="true"] {
  color: var(--paper);
  border-color: rgba(43, 232, 181, .7);
  background: rgba(43, 232, 181, .12);
}

/* ---------- 时间线 ---------- */
.page-about .about-flow {
  position: relative;
  min-width: 0;
}
.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(180deg, rgba(43, 232, 181, .85), rgba(43, 232, 181, .2) 50%, rgba(43, 232, 181, 0));
}
.page-about .about-stage {
  position: relative;
  padding-left: 46px;
  padding-bottom: clamp(48px, 7vw, 92px);
}
.page-about .stage-node {
  position: absolute;
  left: 0;
  top: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid rgba(255, 177, 60, .55);
  background: var(--ink);
  display: grid;
  place-items: center;
}
.page-about .stage-node::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 12px rgba(255, 177, 60, .75);
}
.page-about .stage-node::after {
  content: "";
  position: absolute;
  inset: -7px;
  border-radius: 50%;
  border: 1px dashed rgba(43, 232, 181, .4);
  opacity: 0;
  transform: scale(.78);
  transition: opacity .24s var(--ease), transform .5s var(--ease);
}
.page-about .about-stage:hover .stage-node::after,
.page-about .about-stage:focus-within .stage-node::after {
  opacity: 1;
  transform: scale(1);
}

.page-about .stage-year {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 13px;
  border: 1px solid rgba(255, 177, 60, .35);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gold);
}
.page-about .stage-title {
  margin: 0 0 18px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.1vw, 40px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}
.page-about .stage-body p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(237, 230, 214, .82);
}
.page-about .stage-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 要点列表 ---------- */
.page-about .stage-points {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}
.page-about .stage-points li {
  position: relative;
  padding: 12px 16px 12px 36px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(23, 35, 58, .35);
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
  transition: border-color .22s var(--ease), color .22s var(--ease), transform .22s var(--ease);
}
.page-about .stage-points li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
}
.page-about .stage-points li:hover {
  border-color: rgba(43, 232, 181, .45);
  color: var(--paper);
  transform: translateY(-2px);
}

/* ---------- 数据胶囊 ---------- */
.page-about .stage-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}
.page-about .metric {
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(12, 20, 36, .65);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--steel);
}
.page-about .metric b {
  color: var(--gold);
  font-weight: 600;
}

/* ---------- 配图 ---------- */
.page-about .stage-figure {
  margin: 26px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  overflow: hidden;
  background: linear-gradient(155deg, var(--court), var(--ink));
}
.page-about .stage-figure img {
  display: block;
  width: 100%;
  height: clamp(170px, 24vw, 320px);
  object-fit: cover;
}
.page-about .stage-figure figcaption {
  padding: 12px 18px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 团队分栏 ---------- */
.page-about .stage-split {
  display: grid;
  gap: 26px;
}
.page-about .stage-split .stage-figure {
  margin-top: 0;
}
.page-about .stage-figure--team img {
  height: clamp(180px, 26vw, 280px);
}

/* ---------- 角色分工 ---------- */
.page-about .role-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.page-about .role-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .role-num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  color: var(--neon);
}
.page-about .role-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}
.page-about .role-desc {
  grid-column: 2 / -1;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 收尾链接 ---------- */
.page-about .about-next {
  margin-top: clamp(12px, 2vw, 24px);
  padding-top: clamp(26px, 4vw, 42px);
  border-top: 1px solid var(--line);
}
.page-about .about-next-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .18em;
  color: var(--steel);
}
.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .next-list li + li {
  border-top: 1px solid var(--line);
}
.page-about .next-list a {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 4px;
  font-size: clamp(16px, 1.9vw, 21px);
  color: var(--paper);
  transition: color .2s var(--ease), padding-left .26s var(--ease);
}
.page-about .next-list a::after {
  content: "↗";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--neon);
}
.page-about .next-list a:hover {
  color: var(--neon);
  padding-left: 14px;
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px 26px;
  }
  .page-about .stage-points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 18px;
  }
  .page-about .role-list li {
    grid-template-columns: 60px 130px minmax(0, 1fr);
    align-items: center;
  }
  .page-about .role-desc {
    grid-column: auto;
  }
}

/* ---------- 团队分栏展开 ---------- */
@media (min-width: 900px) {
  .page-about .stage-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 38px;
    align-items: start;
  }
}

/* ---------- 桌面：左侧固定索引 ---------- */
@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 84px);
  }
  .page-about .about-toc {
    position: sticky;
    top: 116px;
    align-self: start;
  }
  .page-about .toc {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .toc-link {
    white-space: normal;
    padding: 10px 0 10px 16px;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
  }
  .page-about .toc-link:hover {
    border-color: var(--line-2);
  }
  .page-about .toc-link[aria-current="true"] {
    background: linear-gradient(90deg, rgba(43, 232, 181, .16), transparent 78%);
    border-left-color: var(--neon);
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .stage-node::after,
  .page-about .stage-points li,
  .page-about .toc-link,
  .page-about .next-list a {
    transition: none;
  }
  .page-about .stage-points li:hover,
  .page-about .about-stage:hover .stage-node::after {
    transform: none;
  }
}
<<<END>>>