.page-about {
  --about-rail-w: 168px;
  --about-cut: polygon(0 14px, 14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  --about-cut-sm: polygon(0 8px, 8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  display: block;
  background:
    linear-gradient(180deg, rgba(216, 162, 74, .05) 0%, rgba(13, 14, 17, 0) 340px),
    var(--obsidian);
}

.page-about .about-gilt {
  font-style: normal;
  color: var(--gilt);
}

.page-about .about-crumb-wrap {
  padding-top: clamp(88px, 11vw, 116px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 0;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--about-cut);
  border: 1px solid var(--rock-line);
  background: var(--rock-deep);
}

.page-about .about-hero-caption {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 54px);
  line-height: 1.16;
  letter-spacing: -.012em;
  color: var(--bone);
}

.page-about .about-hero-lede {
  margin: 0;
  max-width: 44em;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-hero-facts {
  margin: clamp(24px, 4vw, 36px) 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .about-hero-facts > div {
  background: var(--rock-deep);
  padding: 14px 16px;
}

.page-about .about-hero-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
}

.page-about .about-hero-facts dd {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--gilt);
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: center;
  }
}

/* ---------- 骨架：左侧时间线 + 右侧内容 ---------- */

.page-about .about-body {
  padding-top: clamp(56px, 9vw, 104px);
  padding-bottom: clamp(64px, 10vw, 120px);
}

.page-about .about-rail {
  display: none;
}

.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(64px, 9vw, 108px);
}

.page-about .about-chapter {
  max-width: 100%;
  scroll-margin-top: 120px;
}

.page-about .about-chapter h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 32px);
  line-height: 1.24;
  letter-spacing: -.008em;
  color: var(--bone);
}

.page-about .about-chapter .about-lead {
  margin: 0 0 clamp(28px, 4vw, 40px);
  max-width: 46em;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    display: block;
  }

  .page-about .about-rail-sticky {
    position: sticky;
    top: 128px;
    display: grid;
    gap: 16px;
    align-content: start;
  }

  .page-about .about-rail-index {
    margin: 0;
    font-size: 30px;
    line-height: 1;
    color: var(--gilt);
    letter-spacing: .02em;
  }

  .page-about .about-rail-line {
    display: block;
    width: 1px;
    height: clamp(180px, 34vh, 300px);
    background: linear-gradient(180deg, var(--gilt-hi) 0%, var(--gilt) 18%, var(--copper) 52%, var(--rock-line) 100%);
  }

  .page-about .about-rail-cap {
    margin: 0;
    font-size: 11px;
    letter-spacing: .14em;
    color: var(--mist);
    writing-mode: vertical-rl;
  }

  .page-about .about-chapter:nth-child(1) { max-width: 660px; }
  .page-about .about-chapter:nth-child(2) { max-width: 760px; }
  .page-about .about-chapter:nth-child(3) { max-width: 820px; }
  .page-about .about-chapter:nth-child(4) { max-width: 880px; }
  .page-about .about-chapter:nth-child(5) { max-width: 920px; }
}

/* ---------- 时间线节点 ---------- */

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  padding: 26px 0 30px 24px;
  border-left: 1px solid var(--rock-line);
  transition: border-color .45s var(--ease);
}

.page-about .about-node:last-child {
  padding-bottom: 8px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 32px;
  width: 7px;
  height: 7px;
  background: var(--rock-line);
  transform: rotate(45deg);
  transition: background .45s var(--ease), box-shadow .45s var(--ease);
}

.page-about .about-node:hover {
  border-left-color: var(--copper);
}

.page-about .about-node:hover::before {
  background: var(--gilt-hi);
  box-shadow: 0 0 12px rgba(216, 162, 74, .55);
}

.page-about .about-node-year {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--copper);
}

.page-about .about-node h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-node-copy {
  margin: 0;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 插图 ---------- */

.page-about .about-inset {
  margin: clamp(36px, 5vw, 56px) 0 0;
}

.page-about .about-inset img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--about-cut);
  border: 1px solid var(--rock-line);
  background: var(--rock-deep);
}

.page-about .about-inset-cap {
  margin: 12px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--copper);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队三栏 ---------- */

.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  padding: 26px 22px 24px;
  background: linear-gradient(160deg, var(--rock-deep) 0%, #12141a 100%);
  border: 1px solid var(--rock-line);
  clip-path: var(--about-cut);
  transition: border-color .4s var(--ease), transform .4s var(--ease);
}

.page-about .about-team-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 1px;
  background: linear-gradient(90deg, var(--gilt) 0%, rgba(216, 162, 74, 0) 100%);
}

.page-about .about-team-card:hover {
  border-color: var(--copper);
  transform: translateY(-3px);
}

.page-about .about-team-num {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gilt);
}

.page-about .about-team-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--bone);
}

.page-about .about-team-line {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--clay);
}

.page-about .about-team-more {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--rock-line);
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
  opacity: .74;
  transition: opacity .4s var(--ease);
}

.page-about .about-team-card:hover .about-team-more {
  opacity: 1;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: 1.45fr 1fr 1.2fr;
    gap: 18px;
    align-items: start;
  }

  .page-about .about-team-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-team-card:nth-child(3) {
    margin-top: 12px;
  }
}

/* ---------- 原则 ---------- */

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

.page-about .about-principle {
  padding: 26px 22px;
  background: var(--obsidian);
}

.page-about .about-principle-num {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gilt);
}

.page-about .about-principle h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.42;
  color: var(--bone);
}

.page-about .about-principle p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

@media (min-width: 900px) {
  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-principle {
    padding: 30px 24px 34px;
  }

  .page-about .about-principle:nth-child(2) {
    background: var(--rock-deep);
  }
}

/* ---------- 规模数据 ---------- */

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--rock-line);
  border: 1px solid var(--rock-line);
}

.page-about .about-metric {
  background: var(--rock-deep);
  padding: 22px 18px 20px;
}

.page-about .about-metric-num {
  margin: 0;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1;
  color: var(--gilt-hi);
  letter-spacing: -.02em;
}

.page-about .about-metric-label {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--mist);
}

.page-about .about-chart-block {
  margin-top: clamp(30px, 4vw, 44px);
  padding: 24px 20px 20px;
  border: 1px solid var(--rock-line);
  clip-path: var(--about-cut);
  background: linear-gradient(180deg, rgba(23, 26, 32, .9) 0%, rgba(13, 14, 17, .9) 100%);
}

.page-about .about-chart-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 6px;
}

.page-about .about-chart-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  color: var(--bone);
}

.page-about .about-chart-note {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .about-chart {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: 12px;
}

.page-about .about-chart-line {
  fill: none;
  stroke: var(--copper);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart-fill {
  fill: rgba(180, 101, 58, .16);
  stroke: none;
}

.page-about .about-chart-dot {
  fill: var(--gilt-hi);
  stroke: var(--obsidian);
  stroke-width: 2;
  transition: r .3s var(--ease);
}

.page-about .about-chart-dot:hover {
  r: 6;
}

.page-about .about-chart-dot--now {
  fill: var(--patina);
}

.page-about .about-chart-cap {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-legal {
  margin: 26px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 下一步与联系 ---------- */

.page-about .about-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-next-list li {
  padding: 20px 20px 22px;
  border: 1px solid var(--rock-line);
  clip-path: var(--about-cut-sm);
  background: rgba(23, 26, 32, .72);
  transition: border-color .4s var(--ease);
}

.page-about .about-next-list li:hover {
  border-color: var(--copper);
}

.page-about .about-next-list h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.42;
  color: var(--gilt);
}

.page-about .about-next-list p {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 48px);
  padding: clamp(24px, 4vw, 36px);
  border: 1px solid var(--rock-line);
  border-left: 2px solid var(--gilt);
  clip-path: var(--about-cut);
  background: linear-gradient(135deg, rgba(180, 101, 58, .14) 0%, rgba(13, 14, 17, .96) 58%);
}

.page-about .about-cta-text {
  margin: 0 0 22px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--bone);
}

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

.page-about .about-cta-links {
  margin: 20px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .about-cta-links a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--rock-line);
  padding-bottom: 3px;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-cta-links a:hover {
  color: var(--gilt-hi);
  border-bottom-color: var(--gilt);
}

@media (min-width: 900px) {
  .page-about .about-next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node::before,
  .page-about .about-team-card,
  .page-about .about-team-more,
  .page-about .about-chart-dot,
  .page-about .about-next-list li {
    transition: none;
  }
}
<<<END>>>