.page-about {
  --ab-rail: 52px;
  --ab-gap: 16px;
  --ab-node-pad: clamp(36px, 6vw, 80px);
  display: block;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

@media (min-width: 900px) {
  .page-about {
    --ab-rail: 96px;
    --ab-gap: 32px;
    font-size: 17px;
  }
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  color: var(--white);
  letter-spacing: -0.01em;
}

.page-about p {
  margin: 0 0 1.05em;
  max-width: 36em;
}

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

.page-about a {
  color: var(--blue-mist);
  text-decoration: none;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(28px, 4.5vw, 52px) 0 clamp(40px, 6vw, 78px);
  background:
    linear-gradient(180deg, rgba(31, 91, 255, 0.16), rgba(11, 14, 19, 0) 68%),
    var(--ink);
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(to right, var(--rule) 1px, transparent 1px);
  background-size: clamp(88px, 11vw, 176px) 100%;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--blue) 0%, var(--orange) 52%, var(--lime) 100%);
  opacity: 0.85;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 56px);
  margin-top: clamp(24px, 4vw, 44px);
}

@media (min-width: 1000px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(40px, 5vw, 88px);
  }
}

.page-about .ab-hero__main {
  position: relative;
}

.page-about .ab-hero__eyebrow {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--blue-mist);
  text-transform: uppercase;
}

.page-about .ab-hero__num {
  color: var(--lime);
  font-size: 14px;
}

.page-about .ab-hero__title {
  font-size: clamp(34px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.06;
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  font-size: clamp(16px, 1.55vw, 18px);
  line-height: 1.8;
  color: var(--fog);
  max-width: 34em;
}

.page-about .ab-hero__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .ab-hero__side {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .ab-kpi {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.2vw, 24px);
  background: var(--ink-2);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-kpi:hover {
  background: #182029;
}

.page-about .ab-kpi__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 600;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-kpi__unit {
  font-size: 0.52em;
  color: var(--lime);
  margin-left: 2px;
}

.page-about .ab-kpi__lb {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fog);
}

/* ---------- 纵向时间轨 ---------- */

.page-about .ab-track {
  padding-bottom: clamp(48px, 8vw, 110px);
}

.page-about .ab-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  gap: 0 var(--ab-gap);
  padding-block: var(--ab-node-pad);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: calc(var(--ab-rail) / 2);
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--rule);
  transform: translateX(-0.5px);
}

.page-about .ab-node:first-child::before {
  top: calc(var(--ab-node-pad) + 5px);
}

.page-about .ab-node:first-child {
  padding-top: clamp(44px, 6vw, 84px);
}

.page-about .ab-node + .ab-node {
  border-top: 1px solid transparent;
}

.page-about .ab-node__rail {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: calc(var(--ab-node-pad) + 5px);
}

.page-about .ab-node__dot {
  position: relative;
  z-index: 1;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--blue);
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .ab-node.is-active .ab-node__dot {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: 0 0 0 6px rgba(200, 255, 60, 0.14);
}

.page-about .ab-node__body {
  position: relative;
  min-width: 0;
}

.page-about .ab-node__ghost {
  position: absolute;
  top: -0.34em;
  right: 0;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: clamp(68px, 13vw, 148px);
  font-weight: 600;
  line-height: 0.8;
  color: var(--white);
  opacity: 0.05;
  pointer-events: none;
  user-select: none;
}

.page-about .ab-node__head {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .ab-node__eyebrow {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--blue-mist);
}

.page-about .ab-node__idx {
  color: var(--lime);
  font-size: 14px;
}

.page-about .ab-node__title {
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  text-wrap: balance;
}

.page-about .ab-node__body > p {
  position: relative;
  z-index: 1;
  max-width: 36em;
}

/* ---------- 引文叠层 ---------- */

.page-about .ab-quote {
  position: relative;
  z-index: 1;
  margin: clamp(26px, 4vw, 44px) clamp(6px, 1.4vw, 18px) clamp(26px, 4vw, 44px) 0;
  padding: clamp(20px, 3vw, 32px) clamp(22px, 3.4vw, 38px);
  background: var(--indigo);
  border: 1px solid var(--rule);
  transform: rotate(-0.6deg);
  transition:
    transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .ab-quote::after {
  content: "";
  position: absolute;
  inset: 8px -8px -8px 8px;
  border: 1px solid var(--rule);
  pointer-events: none;
  transition: border-color var(--dur) var(--ease);
  z-index: -1;
}

.page-about .ab-quote:hover,
.page-about .ab-quote:focus-within {
  transform: rotate(0deg) translateY(-2px);
  border-color: var(--blue-mist);
}

.page-about .ab-quote:hover::after,
.page-about .ab-quote:focus-within::after {
  border-color: var(--blue);
}

.page-about .ab-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--white);
  max-width: 26em;
}

.page-about .ab-quote__from {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-style: normal;
  letter-spacing: 0.16em;
  color: var(--lime);
}

/* ---------- 团队分工 ---------- */

.page-about .ab-roles {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

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

.page-about .ab-roles__item {
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.2vw, 26px);
  background: var(--ink-2);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-roles__item:hover {
  background: #182029;
}

.page-about .ab-roles__ttl {
  font-size: 16px;
  font-weight: 800;
  color: var(--blue-mist);
  margin-bottom: 10px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .ab-roles__item p {
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 数据链路 ---------- */

.page-about .ab-flow-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .ab-flow-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
    gap: clamp(36px, 4.5vw, 64px);
  }
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-flow__item {
  position: relative;
  padding-left: 26px;
}

.page-about .ab-flow__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 10px;
  background: var(--lime);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-flow__item:hover::before {
  background: var(--orange);
}

.page-about .ab-flow__ttl {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  margin-bottom: 6px;
}

.page-about .ab-flow__item p {
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .ab-flow__figure {
  margin: 0;
}

.page-about .ab-flow__out {
  position: relative;
  z-index: 1;
  margin-top: clamp(26px, 3.6vw, 42px);
  padding-left: clamp(16px, 2vw, 22px);
  border-left: 3px solid var(--orange);
  font-size: clamp(16px, 1.7vw, 18px);
  color: var(--white);
  max-width: 36em;
}

/* ---------- 版本轨道 ---------- */

.page-about .ab-versions {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(16px, 2.2vw, 22px);
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .ab-ver {
  --v: var(--blue);
  position: relative;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.8vw, 32px);
  background: var(--ink-2);
  border-left: 3px solid var(--v);
  transition:
    background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.page-about .ab-ver:hover {
  background: #182029;
  transform: translateX(3px);
}

.page-about .ab-ver--1 { --v: var(--blue); }
.page-about .ab-ver--2 { --v: var(--orange); }
.page-about .ab-ver--3 { --v: var(--lime); }

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

.page-about .ab-ver__gen {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--v);
  border: 1px solid var(--v);
  padding: 3px 9px;
}

.page-about .ab-ver__ttl {
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .ab-ver__text {
  font-size: 15.5px;
  line-height: 1.78;
  max-width: 38em;
}

.page-about .ab-ver__more {
  margin-top: 14px;
}

.page-about .ab-ver__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--v);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-ver__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-ver__more summary::after {
  content: "+";
  font-size: 16px;
  line-height: 1;
  transition: transform var(--dur) var(--ease);
}

.page-about .ab-ver__more[open] summary::after {
  transform: rotate(45deg);
}

.page-about .ab-ver__more summary:hover,
.page-about .ab-ver__more summary:focus-visible {
  color: var(--white);
}

.page-about .ab-ver__more ul {
  margin: 12px 0 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.page-about .ab-ver__more li {
  font-size: 15px;
  line-height: 1.72;
  color: var(--fog);
}

.page-about .ab-ver__more li::marker {
  color: var(--v);
}

/* ---------- 版本对比条 ---------- */

.page-about .ab-chart {
  position: relative;
  z-index: 1;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 32px);
  border: 1px solid var(--rule);
  background: rgba(20, 26, 34, 0.6);
  display: grid;
  gap: 14px;
}

.page-about .ab-chart__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--fog);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-chart__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 12px;
}

.page-about .ab-chart__lb {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white);
  letter-spacing: 0.04em;
}

.page-about .ab-chart__track {
  position: relative;
  display: block;
  height: 10px;
  background: rgba(42, 52, 65, 0.75);
  overflow: hidden;
}

.page-about .ab-chart__fill {
  display: block;
  height: 100%;
  width: 0;
  transition: width var(--dur-slow) var(--ease);
}

.page-about .ab-chart__row--1 .ab-chart__fill { width: 32%; background: var(--blue); }
.page-about .ab-chart__row--2 .ab-chart__fill { width: 66%; background: var(--orange); }
.page-about .ab-chart__row--3 .ab-chart__fill { width: 100%; background: var(--lime); }

.page-about .ab-chart__val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---------- 合作生态 ---------- */

.page-about .ab-partner-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .ab-partner-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4vw, 60px);
  }
}

.page-about .ab-partner__text p {
  max-width: 34em;
}

.page-about .ab-partner__figure {
  margin: 0;
}

/* ---------- 三条坚持 ---------- */

.page-about .ab-principles {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 22px);
  counter-reset: none;
}

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

.page-about .ab-principles__item {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px) clamp(18px, 2.4vw, 28px) clamp(22px, 2.8vw, 32px);
  background: var(--ink-2);
  border-top: 4px solid var(--blue);
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .ab-principles__item--2 { border-top-color: var(--orange); }
.page-about .ab-principles__item--3 { border-top-color: var(--lime); }

.page-about .ab-principles__item:hover {
  background: #182029;
  border-top-color: var(--white);
}

.page-about .ab-principles__ttl {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 900;
  margin-bottom: 10px;
}

.page-about .ab-principles__item p {
  font-size: 15.5px;
  line-height: 1.78;
}

/* ---------- 收尾 ---------- */

.page-about .ab-outro {
  position: relative;
  z-index: 1;
  margin-top: clamp(32px, 4.6vw, 56px);
  padding: clamp(22px, 3vw, 34px) clamp(20px, 2.8vw, 36px);
  background:
    linear-gradient(120deg, rgba(31, 91, 255, 0.22), rgba(255, 106, 24, 0.12) 78%),
    var(--ink-2);
  border-left: 4px solid var(--lime);
}

.page-about .ab-outro p {
  color: var(--white);
  font-size: clamp(16px, 1.7vw, 18px);
  max-width: 40em;
}

.page-about .ab-outro__act {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

/* ---------- 图片容器补充 ---------- */

.page-about .figure {
  margin: clamp(24px, 3.6vw, 40px) 0;
}

.page-about .figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--rule);
  background: var(--ink-2);
}

.page-about .figure--wide img {
  aspect-ratio: 1200 / 640;
}

.page-about .ab-flow__figure img {
  aspect-ratio: 1000 / 700;
}

.page-about .ab-partner__figure img {
  aspect-ratio: 900 / 600;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

/* ---------- 交互降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

.page-about .btn:focus-visible,
.page-about .ab-ver__more summary:focus-visible,
.page-about a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
<<<END>>>