.page-about {
  --ab-rail: 136px;
  background: var(--night);
  color: var(--mist);
  padding-top: var(--header-h);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 36px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .ab-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 46px) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(110% 80% at 8% 0%, rgba(53, 241, 208, 0.13), transparent 62%),
    radial-gradient(90% 90% at 100% 6%, rgba(214, 168, 75, 0.12), transparent 58%),
    linear-gradient(180deg, var(--night) 0%, var(--control) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(214, 168, 75, 0) 62%);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  align-items: end;
}

.page-about .ab-hero-main h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 6vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--mist);
}

.page-about .ab-hero-lead {
  margin: 20px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.9;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 28px;
}

.page-about .ab-hero-aside {
  border-left: 2px solid var(--cyan);
  padding-left: 16px;
}

.page-about .ab-aside-label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .ab-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 16px 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hero-facts > div {
  background: rgba(11, 30, 51, 0.9);
  padding: 14px 16px;
}

.page-about .ab-hero-facts dt {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .ab-hero-facts dd {
  margin: 6px 0 0;
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 600;
  color: var(--gold);
  line-height: 1.1;
}

.page-about .ab-aside-foot {
  margin: 14px 0 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 起源 ---------- */
.page-about .ab-origin {
  background: var(--control);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-origin-grid {
  align-items: start;
  row-gap: clamp(26px, 4vw, 40px);
}

.page-about .ab-origin-text h2 {
  margin: 14px 0 20px;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .ab-origin-text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.88;
}

.page-about .ab-origin-text .ab-quiet {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  font-size: 14px;
  color: var(--steel);
  opacity: 1;
}

.page-about .ab-origin-media {
  margin: 0;
}

.page-about .ab-origin-media .media-cap {
  margin-top: 12px;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  background:
    linear-gradient(180deg, var(--control) 0%, var(--night) 22%, var(--night) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .ab-head .section-title {
  color: var(--mist);
}

.page-about .ab-head-lead {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .ab-chips {
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .ab-chips .chip {
  text-decoration: none;
  white-space: nowrap;
}

.page-about .ab-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 10px;
  left: 7px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 38%, var(--line) 100%);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px) 30px;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--cyan);
}

.page-about .ab-node-year {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  margin-bottom: 12px;
}

.page-about .ab-node-year .mono {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .ab-node-body {
  position: relative;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--slate);
  border-left: 2px solid transparent;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .ab-node-body h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  letter-spacing: -0.005em;
  color: var(--mist);
}

.page-about .ab-node-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .ab-node-body .link-arrow {
  margin-top: 14px;
  display: inline-block;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: var(--control);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team-grid {
  align-items: start;
  row-gap: clamp(26px, 4vw, 40px);
}

.page-about .ab-team-text h2 {
  margin: 14px 0 16px;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .ab-team-text > p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.88;
}

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

.page-about .ab-role-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "num role"
    "num desc";
  gap: 2px 14px;
  padding: 14px 16px;
  background: rgba(6, 17, 31, 0.62);
}

.page-about .ab-role-list .mono {
  grid-area: num;
  align-self: center;
  font-size: 22px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .ab-role-list strong {
  grid-area: role;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .ab-role-list li > span:last-child {
  grid-area: desc;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .ab-team-media {
  margin: 0;
}

.page-about .ab-team-media .media-cap {
  margin-top: 12px;
}

/* ---------- 覆盖数字 ---------- */
.page-about .ab-numbers {
  background:
    linear-gradient(180deg, var(--night) 0%, var(--control) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-plates {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .ab-plate {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--slate);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .ab-plate::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--gold);
}

.page-about .ab-plate-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .ab-plate .stat-num {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .ab-plate .stat-num span {
  font-size: 0.55em;
  color: var(--cyan);
  margin-left: 2px;
}

.page-about .ab-plate-unit {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .ab-plate-note {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .ab-plate .link-arrow {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
}

/* ---------- 合作与准则 ---------- */
.page-about .ab-partners {
  background: var(--night);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-partners-grid {
  align-items: start;
  row-gap: clamp(26px, 4vw, 40px);
}

.page-about .ab-partners-text h2 {
  margin: 14px 0 18px;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .ab-partners-text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.88;
}

.page-about .ab-principles {
  margin: 22px 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .ab-principles li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .ab-principles-mark {
  display: block;
  width: 12px;
  height: 2px;
  margin-top: 9px;
  background: var(--clay);
  transform: rotate(-24deg);
}

.page-about .ab-partners-media {
  margin: 0;
}

.page-about .ab-partners-media .media-cap {
  margin-top: 12px;
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-cadence {
  background: linear-gradient(180deg, var(--control) 0%, var(--night) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow li {
  padding: 20px 18px 22px;
  background: var(--control);
  border-top: 2px solid var(--line);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .ab-flow li:hover {
  border-top-color: var(--cyan);
  background: var(--slate);
}

.page-about .ab-flow-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-flow h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-flow p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  background: var(--night);
  padding-bottom: clamp(46px, 6vw, 78px);
}

.page-about .ab-cta-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(22px, 3.4vw, 38px);
  background:
    linear-gradient(120deg, rgba(214, 168, 75, 0.12) 0%, rgba(11, 30, 51, 0) 48%),
    var(--slate);
  border-left: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}

.page-about .ab-cta-copy h2 {
  margin: 12px 0 12px;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .ab-cta-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
  max-width: 56ch;
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 14px;
  align-items: center;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .ab-hero-aside {
    padding-bottom: 4px;
  }

  .page-about .ab-track::before {
    left: var(--ab-rail);
  }

  .page-about .ab-node {
    display: grid;
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(24px, 3vw, 44px);
    padding: 0 0 clamp(30px, 3.4vw, 46px) 0;
  }

  .page-about .ab-node::before {
    left: var(--ab-rail);
    margin-left: -7px;
    top: 8px;
  }

  .page-about .ab-node-year {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 0;
    padding-left: 20px;
  }

  .page-about .ab-node-body {
    padding: clamp(20px, 2.2vw, 30px);
  }

  .page-about .ab-plates {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-plate {
    grid-column: span 3;
  }

  .page-about .ab-plate--wide {
    grid-column: span 6;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 26px;
    align-items: center;
  }

  .page-about .ab-plate--wide .ab-plate-num {
    grid-column: 1 / -1;
  }

  .page-about .ab-plate--wide .stat-num {
    grid-row: 2 / span 3;
    margin-top: 12px;
  }

  .page-about .ab-plate--wide .ab-plate-unit,
  .page-about .ab-plate--wide .ab-plate-note,
  .page-about .ab-plate--wide .link-arrow {
    grid-column: 2;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --ab-rail: 158px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-flow li,
  .page-about .ab-crumb a {
    transition: none;
  }
}
<<<END>>>