.page-about {
  --rail-w: 210px;
  --about-gap: clamp(22px, 4vw, 56px);
  background-color: var(--ink-800);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 340px at 8% -12%, rgba(0, 229, 255, 0.16), transparent 68%),
    radial-gradient(560px 300px at 94% 6%, rgba(255, 107, 53, 0.12), transparent 70%);
}

.page-about .about-title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 56px);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--text);
  max-width: 22em;
}

.page-about .about-lead {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .stat-strip {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ink-900);
  transition: background 0.3s var(--ease);
}

.page-about .stat:hover {
  background: var(--panel);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-unit {
  margin-left: 2px;
  font-size: 0.58em;
  color: var(--mist);
}

.page-about .stat-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding: clamp(26px, 4vw, 60px) 0 clamp(48px, 7vw, 88px);
}

/* ---------- 左侧目录 ---------- */
.page-about .rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .rail-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
}

.page-about .rail-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 4px 8px 0;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cyan-soft);
}

.page-about .rail-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--panel-hi);
  border: 1px solid var(--line);
  transition: background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .rail-link:hover .rail-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.16);
}

.page-about .rail-idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .rail-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

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

.page-about .chapter-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .chapter-num {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .chapter-num::after {
  content: "";
  width: 36px;
  height: 1px;
  background: var(--line);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: var(--text);
  transition: color 0.3s var(--ease);
}

.page-about .chapter:target .chapter-title {
  color: var(--cyan-soft);
}

.page-about .chapter-lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .chapter-lead a,
.page-about .chapter-text a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 233, 245, 0.35);
}

.page-about .chapter-lead a:hover,
.page-about .chapter-text a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .chapter-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

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

.page-about .chapter-note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 双轴示意 ---------- */
.page-about .axis-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .axis-cell {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(160deg, rgba(0, 229, 255, 0.07), transparent 62%),
    var(--panel);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .axis-cell--list {
  background:
    linear-gradient(160deg, rgba(255, 107, 53, 0.09), transparent 62%),
    var(--panel);
}

.page-about .axis-cell strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

/* ---------- 图文错位 ---------- */
.page-about .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  align-items: start;
}

.page-about .shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
}

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

.page-about .shot figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .version-list {
  position: relative;
  list-style: none;
  display: grid;
  gap: clamp(18px, 3vw, 26px);
  margin: 0;
  padding: 0;
}

.page-about .version-list::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 25px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(0, 229, 255, 0.6) 58%, transparent);
}

.page-about .version-item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: clamp(14px, 2.5vw, 22px);
  align-items: start;
}

.page-about .version-badge {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 14.5px;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .version-item--current .version-badge {
  border-color: rgba(0, 229, 255, 0.55);
  color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.08);
}

.page-about .version-body h3 {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

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

/* ---------- 团队条带 ---------- */
.page-about .team-bands {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .band {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .band:hover {
  background: var(--panel-hi);
}

.page-about .band--content {
  border-left-color: var(--cyan);
}

.page-about .band--tech {
  border-left-color: var(--gold);
}

.page-about .band--support {
  border-left-color: var(--orange);
}

.page-about .band-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .band-name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .band-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan-soft);
  font-variant-numeric: tabular-nums;
}

.page-about .band-bar {
  height: 5px;
  margin: 12px 0 10px;
  border-radius: 3px;
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .band-bar > span {
  display: block;
  height: 100%;
  border-radius: 3px;
}

.page-about .band--content .band-bar > span {
  width: 40%;
  background: var(--cyan);
}

.page-about .band--tech .band-bar > span {
  width: 27%;
  background: var(--gold);
}

.page-about .band--support .band-bar > span {
  width: 33%;
  background: var(--orange);
}

.page-about .band-desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 治理流程 ---------- */
.page-about .gov-steps {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .gov-step {
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(0, 229, 255, 0.05), transparent 58%),
    var(--ink-900);
  transition: border-top-color 0.3s var(--ease);
}

.page-about .gov-step:hover {
  border-top-color: var(--cyan);
}

.page-about .gov-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .gov-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .gov-step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .chapter--cta .chapter-title {
  margin-bottom: 10px;
}

/* ---------- 生态 ---------- */
.page-about .shot--wide {
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-about .eco-metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .eco-metrics li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 12px;
  background: var(--ink-900);
}

.page-about .eco-num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .eco-label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .eco-partners h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

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

.page-about .partner-list li {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .partner-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .partner-list strong {
  margin-right: 6px;
  font-weight: 500;
  color: var(--text);
}

.page-about .partner-tag {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  margin-right: 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--cyan-soft);
  vertical-align: middle;
}

/* ---------- 回入口 ---------- */
.page-about .about-cta {
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(520px 220px at 88% 0%, rgba(0, 229, 255, 0.14), transparent 70%),
    radial-gradient(380px 200px at 0% 100%, rgba(255, 107, 53, 0.1), transparent 72%),
    linear-gradient(180deg, var(--panel), var(--ink-900));
}

.page-about .cta-text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 24px);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .gov-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .axis-map {
    grid-template-columns: 34% minmax(0, 1fr);
    gap: 12px;
  }
}

@media (min-width: 800px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(24px, 3.5vw, 40px);
  }

  .page-about .split--media-left {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  }

  .page-about .split--media-right {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
  }

  .page-about .split--media-right .shot {
    margin-top: 46px;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 44px);
    align-items: start;
  }

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

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .rail {
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 4px 0 0 20px;
  }

  .page-about .rail-inner {
    position: sticky;
    top: 96px;
  }

  .page-about .rail-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .rail-link {
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stat,
  .page-about .band,
  .page-about .gov-step,
  .page-about .chapter-title,
  .page-about .rail-link,
  .page-about .rail-dot {
    transition: none;
  }
}
<<<END>>>