.page-about {
  --ab-rail: 176px;
  --ab-gap: clamp(20px, 4vw, 48px);
  --ab-block-pad: clamp(52px, 8vw, 104px);
  color: var(--mist);
}

.page-about .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .section {
  padding-block: var(--ab-block-pad);
}

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

/* ---------- Hero ---------- */
.page-about .ab-hero {
  padding-block: clamp(26px, 4.5vw, 52px) clamp(22px, 4vw, 44px);
}

.page-about .ab-hero-top {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .ab-hero-copy .display-1 {
  margin-top: 10px;
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.page-about .ab-h1-mark {
  color: var(--cyan);
  box-shadow: inset 0 -0.16em 0 rgba(43, 227, 200, .22);
}

.page-about .ab-hero-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-bottom: 4px;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-hero-figure {
  margin: clamp(26px, 4vw, 48px) 0 0;
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(120deg, var(--emerald) 0%, var(--ink-2) 58%, var(--indigo) 100%);
}

.page-about .ab-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(11, 13, 12, .72) 0%, rgba(11, 13, 12, .12) 46%, rgba(43, 227, 200, .16) 100%),
    repeating-linear-gradient(115deg, rgba(233, 241, 236, .06) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.page-about .ab-hero-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: .82;
}

.page-about .ab-hero-figure figcaption {
  position: absolute;
  left: clamp(16px, 3vw, 30px);
  bottom: clamp(14px, 2.5vw, 24px);
  z-index: 1;
  color: var(--amber-soft);
  max-width: 30ch;
}

/* ---------- 窄栏 + 宽栏 ---------- */
.page-about .ab-cols {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .ab-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .ab-rail .index-num {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--cyan);
  line-height: 1;
}

.page-about .ab-rail .tiny {
  color: var(--graphite);
}

.page-about .ab-main > h2 {
  margin-bottom: 18px;
}

.page-about .ab-main > p {
  max-width: 62ch;
  margin-bottom: 16px;
}

.page-about .ab-main a {
  color: var(--cyan);
  text-decoration-color: rgba(43, 227, 200, .45);
  text-underline-offset: 4px;
}

.page-about .ab-main a:hover {
  color: var(--amber);
}

/* ---------- 规模数字 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 26px);
  background: var(--ink-2);
}

.page-about .ab-stat--wide {
  grid-column: span 2;
  background: linear-gradient(118deg, var(--emerald) 0%, var(--emerald-mid) 100%);
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5.4vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .ab-stat--wide .ab-stat-num {
  color: var(--amber);
}

.page-about .ab-stat-unit {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

.page-about .ab-stat--wide .ab-stat-unit {
  color: var(--amber-soft);
}

/* ---------- 数据来源 ---------- */
.page-about .ab-block--emerald {
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(43, 227, 200, .12) 0%, transparent 58%),
    linear-gradient(180deg, var(--ink) 0%, var(--emerald) 100%);
}

.page-about .ab-source-grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(22px, 3.4vw, 40px);
}

.page-about .ab-source-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .ab-source-step {
  padding: 16px 18px;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: rgba(11, 13, 12, .42);
}

.page-about .ab-source-idx {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .ab-source-step p:last-child {
  margin: 0;
  font-size: 15px;
  color: var(--mist);
}

.page-about .ab-source-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--ink);
}

.page-about .ab-source-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: .88;
}

/* ---------- 团队 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.6vw, 40px);
}

.page-about .ab-team {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-lg);
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-top: 4px solid var(--emerald-mid);
}

.page-about .ab-team--b {
  border-top-color: var(--cyan);
  background: linear-gradient(180deg, rgba(43, 227, 200, .08) 0%, var(--ink-2) 62%);
}

.page-about .ab-team--c {
  border-top-color: var(--amber);
}

.page-about .ab-team-idx {
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--graphite);
}

.page-about .ab-team h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .ab-team p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  opacity: .86;
}

.page-about .ab-team-note {
  margin-top: clamp(18px, 2.6vw, 26px);
  padding-left: 16px;
  border-left: 2px solid var(--graphite);
  font-size: 14px;
  color: var(--graphite);
  max-width: 58ch;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-block--deep {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--ink) 0%, var(--indigo) 130%);
}

.page-about .ab-timeline-bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .ab-timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
}

.page-about .ab-block--deep .ab-cols {
  position: relative;
  z-index: 1;
}

.page-about .ab-timeline {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  border-left: 1px solid var(--line-strong);
}

.page-about .ab-tl-item {
  position: relative;
  padding-left: clamp(20px, 3vw, 32px);
  padding-bottom: 18px;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 227, 200, .16);
}

.page-about .ab-tl-item details {
  border-radius: var(--r-md);
  background: rgba(11, 13, 12, .48);
  border: 1px solid var(--line);
}

.page-about .ab-tl-item summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  padding: 16px clamp(16px, 2.4vw, 22px);
  cursor: pointer;
  list-style: none;
  transition: background var(--t-fast);
  border-radius: var(--r-md);
}

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

.page-about .ab-tl-item summary:hover {
  background: rgba(43, 227, 200, .07);
}

.page-about .ab-tl-item[open] summary {
  border-bottom: 1px solid var(--line);
  border-radius: var(--r-md) var(--r-md) 0 0;
}

.page-about .ab-tl-year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .ab-tl-ver {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid rgba(43, 227, 200, .4);
  border-radius: var(--r-pill);
  padding: 3px 10px;
}

.page-about .ab-tl-title {
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-tl-item details p {
  margin: 0;
  padding: 14px clamp(16px, 2.4vw, 22px) 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  opacity: .82;
  max-width: 58ch;
}

/* ---------- 质量指标 ---------- */
.page-about .ab-metrics {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.6vw, 38px);
}

.page-about .ab-metric {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--r-lg);
  background: var(--ink-2);
  border: 1px solid var(--line);
  outline: none;
  transition: transform var(--t-mid), border-color var(--t-mid);
}

.page-about .ab-metric:hover,
.page-about .ab-metric:focus-visible {
  transform: translateX(4px);
  border-color: var(--line-strong);
}

.page-about .ab-metric-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 12px;
}

.page-about .ab-metric-name {
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 700;
}

.page-about .ab-metric-tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--graphite);
}

.page-about .ab-metric-bar {
  height: 8px;
  border-radius: var(--r-pill);
  background: rgba(233, 241, 236, .09);
  overflow: hidden;
}

.page-about .ab-metric-bar span {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan-deep) 100%);
  transition: filter var(--t-fast);
}

.page-about .ab-metric-bar--amber span {
  background: linear-gradient(90deg, var(--amber) 0%, #b57d16 100%);
}

.page-about .ab-metric-bar--soft span {
  background: linear-gradient(90deg, var(--amber-soft) 0%, var(--graphite) 100%);
}

.page-about .ab-metric:hover .ab-metric-bar span,
.page-about .ab-metric:focus-visible .ab-metric-bar span {
  filter: brightness(1.2);
}

.page-about .ab-metric-desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  max-width: 58ch;
}

/* ---------- 纠错流程 ---------- */
.page-about .ab-block--wine {
  background:
    radial-gradient(110% 80% at 12% 0%, rgba(90, 31, 46, .55) 0%, transparent 62%),
    var(--ink);
}

.page-about .ab-steps {
  list-style: none;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: none;
}

.page-about .ab-step {
  padding: clamp(16px, 2.4vw, 22px);
  border-radius: var(--r-md);
  background: rgba(233, 241, 236, .035);
  border: 1px solid var(--line);
}

.page-about .ab-step-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.page-about .ab-step h3 {
  margin: 8px 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  opacity: .82;
}

.page-about .ab-inline-link {
  margin-top: clamp(20px, 3vw, 30px);
  font-size: 15px;
  color: var(--graphite);
}

/* ---------- 合作收束 ---------- */
.page-about .ab-final {
  padding-bottom: clamp(70px, 10vw, 130px);
}

.page-about .ab-final-panel {
  position: relative;
  padding: clamp(28px, 5vw, 62px) clamp(22px, 4.5vw, 58px);
  border-radius: var(--r-lg);
  overflow: hidden;
  background:
    linear-gradient(115deg, var(--emerald) 0%, var(--emerald-mid) 42%, var(--ink) 100%);
  border: 1px solid var(--line-strong);
}

.page-about .ab-final-panel::before {
  content: "";
  position: absolute;
  right: -14%;
  top: -40%;
  width: 62%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 178, 51, .2) 0%, transparent 68%);
  pointer-events: none;
}

.page-about .ab-final-panel > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-final-panel .eyebrow {
  color: var(--amber);
}

.page-about .ab-final-panel h2 {
  margin: 12px 0 16px;
  max-width: 22ch;
}

.page-about .ab-final-panel p {
  max-width: 62ch;
  margin-bottom: 14px;
}

.page-about .ab-final-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stat--wide {
    grid-column: span 2;
  }

  .page-about .ab-teams {
    grid-template-columns: 1.15fr 1fr .92fr;
    align-items: start;
  }

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

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

  .page-about .ab-source-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-top {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    align-items: end;
    gap: var(--ab-gap);
  }

  .page-about .ab-cols {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: var(--ab-gap);
  }

  .page-about .ab-rail {
    flex-direction: column;
    gap: 8px;
    padding-bottom: 0;
    border-bottom: none;
    border-top: 1px solid var(--line-strong);
    padding-top: 12px;
  }

  .page-about .ab-timeline {
    margin-left: 6px;
  }
}

@media (max-width: 420px) {
  .page-about .ab-hero-actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }

  .page-about .ab-stat-num {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-metric,
  .page-about .ab-metric-bar span,
  .page-about .ab-tl-item summary {
    transition: none;
  }

  .page-about .ab-metric:hover,
  .page-about .ab-metric:focus-visible {
    transform: none;
  }
}
<<<END>>>