.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 128px 0 68px;
  background: linear-gradient(180deg, var(--night) 0%, var(--night-soft) 60%, var(--night) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero-media {
  position: absolute;
  inset: 0;
  opacity: .32;
  pointer-events: none;
}

.page-about .ab-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 78% at 10% 16%, rgba(18, 160, 107, .24), transparent 58%),
    linear-gradient(180deg, rgba(10, 20, 24, .3), var(--night) 90%);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-hero-title {
  margin: 20px 0 0;
  max-width: 17ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(31px, 6.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .ab-hero-lede {
  margin: 24px 0 0;
  max-width: 60ch;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .ab-hero-tags {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-layout {
  display: block;
  padding-top: 52px;
  padding-bottom: 88px;
}

.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-rail {
  margin-bottom: 36px;
}

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

.page-about .ab-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-rail-list a {
  display: block;
  white-space: nowrap;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .ab-rail-list a:hover,
.page-about .ab-rail-list a[aria-current="true"] {
  color: var(--whistle);
  border-color: rgba(255, 107, 53, .55);
  background: rgba(255, 107, 53, .08);
}

.page-about .ab-block {
  padding: 40px 0 54px;
  border-top: 1px solid var(--line);
}

.page-about .ab-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-note {
  margin: 22px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--pitch-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.page-about .ab-more {
  margin: 28px 0 0;
}

/* 起点 · 里程碑 */
.page-about .ab-milestones {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .ab-milestone {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--whistle);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(10px);
  transition: transform .3s ease, border-color .3s ease;
}

.page-about .ab-milestone:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  border-left-color: var(--whistle);
}

.page-about .ab-milestone-year {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 42px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--whistle);
}

.page-about .ab-milestone-title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-milestone p {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* 规模 */
.page-about .ab-scale-grid {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--line);
  overflow: hidden;
}

.page-about .ab-scale-item {
  padding: 26px 22px 28px;
  background: var(--night-soft);
}

.page-about .ab-scale-num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 72px);
  line-height: .92;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .ab-scale-item:nth-child(1) .ab-scale-num { color: var(--whistle); }
.page-about .ab-scale-item:nth-child(2) .ab-scale-num { color: var(--pitch-bright); }
.page-about .ab-scale-item:nth-child(3) .ab-scale-num { color: var(--loess); }
.page-about .ab-scale-item:nth-child(4) .ab-scale-num { color: var(--ink-dim); }

.page-about .ab-scale-cap {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.5;
}

.page-about .ab-scale-cap em {
  display: block;
  margin-top: 7px;
  font-family: var(--font-body);
  font-size: 14px;
  font-style: normal;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink-mute);
}

/* 数据链路 */
.page-about .ab-pipeline {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .ab-pipe-visual {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.page-about .ab-pipe-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-pipe-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 110, 79, .18), rgba(10, 20, 24, .55));
}

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

.page-about .ab-pipe-step {
  position: relative;
  margin-left: 15px;
  padding: 0 0 24px 46px;
  border-left: 1px solid var(--line-strong);
}

.page-about .ab-pipe-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-pipe-idx {
  position: absolute;
  left: -15px;
  top: 0;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--pitch-deep);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .ab-pipe-step h3 {
  margin: 3px 0 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-pipe-step p {
  margin: 8px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .ab-cadence {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .ab-cadence-row {
  padding: 20px 22px;
  background: var(--night-soft);
}

.page-about .ab-cadence-time {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 23px;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--whistle);
}

.page-about .ab-cadence-row p {
  margin: 9px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* 版本演进 */
.page-about .ab-versions {
  position: relative;
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--night-soft);
  overflow: hidden;
}

.page-about .ab-versions-bg {
  position: absolute;
  inset: 0;
  opacity: .22;
  pointer-events: none;
}

.page-about .ab-versions-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-versions::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(10, 20, 24, .93), rgba(10, 20, 24, .74) 55%, rgba(20, 82, 74, .68));
  pointer-events: none;
}

.page-about .ab-ver-list {
  position: relative;
  z-index: 2;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-ver {
  display: grid;
  gap: 10px;
  padding: 26px 22px;
  border-top: 1px solid var(--line);
}

.page-about .ab-ver:first-child {
  border-top: 0;
}

.page-about .ab-ver-badge {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--whistle);
}

.page-about .ab-ver-season {
  display: block;
  margin-top: 7px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--ink-mute);
}

.page-about .ab-ver p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-dim);
}

/* 团队构成 */
.page-about .ab-team {
  display: grid;
  gap: 22px;
  margin-top: 32px;
}

.page-about .ab-team-row {
  display: grid;
  gap: 9px;
}

.page-about .ab-team-row:nth-child(1) { --ab-team-c: var(--pitch-bright); }
.page-about .ab-team-row:nth-child(2) { --ab-team-c: var(--whistle); }
.page-about .ab-team-row:nth-child(3) { --ab-team-c: var(--loess); }
.page-about .ab-team-row:nth-child(4) { --ab-team-c: var(--ink-dim); }

.page-about .ab-team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .ab-team-role {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-team-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  color: var(--ab-team-c, var(--pitch-bright));
}

.page-about .ab-team-bar {
  height: 8px;
  border-radius: var(--radius-pill);
  background: rgba(242, 247, 244, .08);
  overflow: hidden;
}

.page-about .ab-team-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--ab-team-c, var(--pitch-bright));
  box-shadow: 0 0 16px -5px var(--ab-team-c, var(--pitch-bright));
}

.page-about .ab-team-row:nth-child(1) .ab-team-bar span { width: 31%; }
.page-about .ab-team-row:nth-child(2) .ab-team-bar span { width: 25%; }
.page-about .ab-team-row:nth-child(3) .ab-team-bar span { width: 18%; }
.page-about .ab-team-row:nth-child(4) .ab-team-bar span { width: 26%; }

.page-about .ab-team-desc {
  margin: 2px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* 合作与资质 */
.page-about .ab-alliance-grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .ab-alliance-card {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(9px);
  transition: transform .3s ease, border-color .3s ease, background-color .3s ease;
}

.page-about .ab-alliance-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--glass-strong);
}

.page-about .ab-alliance-idx {
  display: inline-block;
  margin-bottom: 14px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--pitch-bright);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--pitch-bright);
}

.page-about .ab-alliance-card:nth-child(2) .ab-alliance-idx {
  border-bottom-color: var(--whistle);
  color: var(--whistle);
}

.page-about .ab-alliance-card:nth-child(3) .ab-alliance-idx {
  border-bottom-color: var(--loess);
  color: var(--loess);
}

.page-about .ab-alliance-card:nth-child(4) .ab-alliance-idx {
  border-bottom-color: var(--ink-dim);
  color: var(--ink-dim);
}

.page-about .ab-alliance-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .ab-alliance-card p {
  margin: 10px 0 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* 持续关注 */
.page-about .ab-watch {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.page-about .ab-watch-main {
  min-width: 0;
}

.page-about .ab-watch-aside {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(11, 110, 79, .18), rgba(10, 20, 24, .45));
}

.page-about .ab-watch-aside-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--pitch-bright);
}

.page-about .ab-watch-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-watch-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-dim);
}

.page-about .ab-watch-list strong {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-watch-fact {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--loess);
}

@media (min-width: 700px) {
  .page-about .ab-milestones,
  .page-about .ab-alliance-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-pipeline {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .ab-ver {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 30px 32px;
  }

  .page-about .ab-watch {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .ab-layout {
    display: grid;
    grid-template-columns: 192px minmax(0, 1fr);
    gap: 54px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    max-height: calc(100vh - 148px);
    overflow-y: auto;
    margin-bottom: 0;
  }

  .page-about .ab-rail-title {
    display: block;
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .16em;
    color: var(--ink-mute);
  }

  .page-about .ab-rail-list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-rail-list a {
    margin-left: -2px;
    padding: 10px 0 10px 15px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    white-space: normal;
    background: none;
    line-height: 1.5;
  }

  .page-about .ab-rail-list a:hover,
  .page-about .ab-rail-list a[aria-current="true"] {
    background: none;
    border-left-color: var(--whistle);
    color: var(--whistle);
  }
}

@media (min-width: 1080px) {
  .page-about .ab-scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero {
    padding-top: 148px;
    padding-bottom: 84px;
  }

  .page-about .ab-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-milestone,
  .page-about .ab-alliance-card {
    transition: none;
  }

  .page-about .ab-milestone:hover,
  .page-about .ab-alliance-card:hover {
    transform: none;
  }
}
<<<END>>>