.page-about {
  --about-rail: 196px;
  --about-indent: clamp(32px, 3.6vw, 52px);
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  padding: clamp(24px, 3.4vw, 40px) 0 clamp(38px, 5.5vw, 76px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 165%;
  background:
    radial-gradient(46% 58% at 15% 0%, rgba(37, 225, 212, .17), transparent 72%),
    radial-gradient(42% 56% at 84% 10%, rgba(124, 92, 255, .15), transparent 74%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 4.6vw, 56px);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: .02em;
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-mid);
}

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

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(36px, 6.2vw, 84px);
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 0 0 clamp(18px, 2.4vw, 30px);
  max-width: 17ch;
}

.page-about .about-hero .lede {
  font-size: clamp(16px, 1.45vw, 19px);
  line-height: 1.82;
  color: var(--mist);
  max-width: 60ch;
  margin: 0;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(32px, 4.4vw, 56px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 700px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .hero-fact {
  background: var(--ink-0);
  padding: clamp(14px, 1.8vw, 22px) clamp(16px, 2vw, 26px);
}

.page-about .hero-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 8px;
}

.page-about .hero-fact dd {
  margin: 0;
  font-size: clamp(14px, 1.25vw, 17px);
  line-height: 1.55;
  color: var(--white);
}

.page-about .hero-fact .mono {
  font-family: var(--font-mono);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  padding-top: clamp(40px, 6vw, 88px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 104px);
  }
}

/* 左侧年份刻度 */
.page-about .about-rail {
  display: none;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-row-h) + 28px);
    align-self: start;
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }
}

.page-about .rail-title {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--mist);
  margin: 0 0 18px;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-link {
  position: relative;
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.page-about .rail-link::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 50%;
  width: 10px;
  height: 1px;
  background: var(--line-mid);
  transform: translateY(-50%);
  transition: width .22s var(--ease), background .22s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--white);
}

.page-about .rail-link:hover::before {
  width: 16px;
  background: var(--cyan);
}

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

.page-about .rail-link[aria-current="true"]::before {
  width: 18px;
  background: var(--cyan);
}

.page-about .rail-year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-link[aria-current="true"] .rail-year {
  color: var(--cyan);
}

/* ---------- 纵向主轴 ---------- */
.page-about .about-stream {
  position: relative;
  min-width: 0;
}

.page-about .about-stream::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 58%, var(--orange) 100%);
  opacity: .4;
}

.page-about .about-stream > * {
  padding-left: var(--about-indent);
}

/* ---------- 阶段 ---------- */
.page-about .stage {
  position: relative;
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-about .stage-node {
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
}

.page-about .node-ring {
  fill: none;
  stroke: rgba(37, 225, 212, .3);
  stroke-width: 1;
}

.page-about .node-dot {
  fill: var(--cyan);
}

.page-about .stage--milestone .node-ring {
  stroke: rgba(255, 90, 43, .38);
}

.page-about .stage--milestone .node-dot {
  fill: var(--orange);
}

.page-about .stage-year {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.05vw, 15px);
  letter-spacing: .18em;
  color: var(--cyan);
  margin: 0 0 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .stage--milestone .stage-year {
  color: var(--orange);
}

.page-about .stage-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(23px, 3.1vw, 38px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 clamp(14px, 1.9vw, 22px);
  max-width: 21ch;
}

.page-about .stage-copy p {
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 1em;
  max-width: 64ch;
}

.page-about .stage-copy p:last-child {
  margin-bottom: 0;
}

.page-about .stage-copy a,
.page-about .block-copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 225, 212, .35);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .stage-copy a:hover,
.page-about .block-copy a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .stage-grid {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

@media (min-width: 880px) {
  .page-about .stage--split .stage-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    align-items: start;
  }
}

/* ---------- 配图与展签 ---------- */
.page-about .stage-figure,
.page-about .block-figure,
.page-about .between-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--surface-0);
}

.page-about .stage-figure .media-img,
.page-about .block-figure .media-img,
.page-about .between-figure .media-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
  filter: saturate(.92) contrast(1.02);
}

.page-about .between-figure {
  margin-bottom: clamp(44px, 6vw, 84px);
}

.page-about .between-figure .media-img {
  aspect-ratio: 3 / 2;
}

.page-about .media-caption,
.page-about .between-figure figcaption {
  display: block;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
  padding: 12px 16px 14px;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- 叙事区块 ---------- */
.page-about .block {
  position: relative;
  border-top: 1px solid var(--line);
  padding-top: clamp(30px, 4vw, 52px);
  padding-bottom: clamp(44px, 6vw, 84px);
}

.page-about .block--last {
  padding-bottom: 0;
  border-bottom: 1px solid var(--line);
}

.page-about .block .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--violet);
  margin: 0 0 14px;
}

.page-about .block-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(22px, 2.9vw, 36px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 clamp(14px, 2vw, 22px);
  max-width: 26ch;
}

.page-about .block-copy p {
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 1em;
  max-width: 66ch;
}

.page-about .block-copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 740px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-cell--lead {
    grid-column: 1 / -1;
  }
}

.page-about .team-cell {
  background: var(--ink-0);
  padding: clamp(18px, 2.2vw, 28px);
  transition: background .22s var(--ease);
}

.page-about .team-cell:hover {
  background: var(--ink-1);
}

.page-about .team-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.3;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .team-cell--lead .team-name {
  color: var(--cyan);
}

.page-about .team-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  margin: 0;
  max-width: 62ch;
}

.page-about .team-desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 225, 212, .35);
}

.page-about .team-desc a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .block-figure {
  margin: clamp(24px, 3.2vw, 38px) 0 0;
}

/* ---------- 协作生态 ---------- */
.page-about .eco-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

@media (min-width: 780px) {
  .page-about .eco-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .eco-item {
  background: var(--ink-0);
  padding: clamp(18px, 2.2vw, 26px);
}

.page-about .eco-item dt {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  margin: 0 0 12px;
}

.page-about .eco-item dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .eco-quote {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  padding: clamp(18px, 2.4vw, 28px) clamp(18px, 2.6vw, 32px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--violet);
  background: linear-gradient(135deg, rgba(124, 92, 255, .1) 0%, rgba(37, 225, 212, .05) 100%);
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.4vw, 19px);
  line-height: 1.78;
  color: var(--white);
  max-width: 60ch;
}

/* ---------- 下一步 ---------- */
.page-about .next-list {
  list-style: none;
  margin: clamp(24px, 3.2vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .next-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(12px, 2vw, 24px);
  padding: clamp(20px, 2.4vw, 30px) 0;
  border-bottom: 1px solid var(--line);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}

.page-about .next-item:hover {
  transform: translateX(4px);
  border-bottom-color: var(--line-cyan);
}

.page-about .next-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}

.page-about .next-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: 88%;
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.35;
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .next-desc {
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 行动入口 ---------- */
.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .cta-links .btn {
  flex: 0 0 auto;
}

@media (max-width: 520px) {
  .page-about .cta-links .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link::before,
  .page-about .team-cell,
  .page-about .next-item {
    transition: none;
  }

  .page-about .next-item:hover {
    transform: none;
  }
}
</PAGE_CSS>>>