.page-about {
  --about-gap: clamp(56px, 9vw, 104px);
  --about-gold: var(--gold);
  counter-reset: limit;
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  padding: 22px 0 0;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(16px, 2vw, 26px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--rule);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, .62), rgba(255, 255, 255, .26) 60%, rgba(169, 207, 224, .22));
  padding: clamp(30px, 5vw, 58px) clamp(20px, 4vw, 52px) clamp(24px, 4vw, 46px);
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  height: 6px;
  background-image: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 18px);
  pointer-events: none;
}

.page-about .about-hero__frame::before { top: 10px; }
.page-about .about-hero__frame::after { bottom: 10px; opacity: .6; }

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px 20px;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-hero__stat dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cobalt);
}

.page-about .about-hero__stat dd {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--body-text);
}

.page-about .about-hero__stat dd .num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.05;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__figure {
  margin: clamp(18px, 3vw, 28px) 0 0;
}

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

/* ---------- 区块节奏 ---------- */
.page-about section + section {
  margin-top: var(--about-gap);
}

.page-about .about-link {
  color: var(--lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 139, 184, .45);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cobalt);
  border-bottom-color: var(--gold);
}

/* ---------- 站点性质 ---------- */
.page-about .about-nature__grid {
  display: grid;
  gap: 18px;
  padding-top: clamp(28px, 5vw, 40px);
  border-top: 1px solid var(--rule);
}

.page-about .about-nature__index {
  margin: 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-nature__kicker {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cobalt);
}

.page-about .about-nature__title {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-nature__main p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--body-text);
  max-width: 62ch;
}

.page-about .about-nature__note {
  margin-top: 20px !important;
  padding: 14px 18px;
  background: var(--glass);
  border-left: 2px solid var(--lake);
  font-size: 14px !important;
  color: var(--cobalt);
}

/* ---------- 沿革刻度 ---------- */
.page-about .about-rail {
  position: relative;
  margin-top: clamp(30px, 5vw, 48px);
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--rule), rgba(195, 210, 220, .25));
}

.page-about .rail-item {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 16px;
  padding-bottom: clamp(32px, 5vw, 48px);
}

.page-about .rail-item__dot {
  grid-column: 1;
  grid-row: 1;
  justify-self: center;
  align-self: start;
  width: 11px;
  height: 11px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--gold);
  border: 1px solid var(--gold);
}

.page-about .rail-item__dot--hollow {
  background: var(--paper);
  border-color: var(--gold);
}

.page-about .rail-item__label {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cobalt);
}

.page-about .rail-item__content {
  grid-column: 2;
  grid-row: 2;
  margin-top: 8px;
}

.page-about .rail-item__title {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .rail-item__content > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
  max-width: 58ch;
}

.page-about .rail-item__more {
  margin-top: 12px;
}

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

.page-about .rail-figure {
  margin: 0 0 clamp(32px, 5vw, 48px);
}

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

.page-about .rail-figure .figure-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--cobalt);
  letter-spacing: .02em;
}

.page-about .about-rail__foot {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body-text);
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--rule);
}

/* ---------- 三类口径 ---------- */
.page-about .about-scope .filter-bar {
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .scope-list {
  display: grid;
  gap: 18px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .scope-item {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 3vw, 28px);
  background: var(--glass);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--cobalt);
  backdrop-filter: blur(6px);
}

.page-about .scope-item[hidden] {
  display: none;
}

.page-about .scope-item__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .scope-item__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .scope-item__defs {
  display: grid;
  gap: 14px;
  margin: 8px 0 0;
}

.page-about .scope-item__def {
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid rgba(195, 210, 220, .75);
}

.page-about .scope-item__def dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cobalt);
}

.page-about .scope-item__def dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .about-scope__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--body-text);
}

/* ---------- 合作数量 ---------- */
.page-about .about-partners {
  padding-top: clamp(28px, 5vw, 40px);
  border-top: 1px solid var(--rule);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-partners__anchor {
  position: relative;
  padding-left: 20px;
}

.page-about .about-partners__anchor::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background-image: repeating-linear-gradient(to bottom, var(--rule) 0 5px, transparent 5px 13px);
}

.page-about .about-partners__anchor .anchor-num {
  margin: 8px 0 0;
}

.page-about .about-partners__anchor .anchor-num__value {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(64px, 14vw, 104px);
  line-height: .95;
  letter-spacing: -0.02em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__anchor .anchor-num__unit {
  margin-left: 8px;
  font-size: 18px;
  color: var(--ink);
}

.page-about .about-partners__anchor .anchor-num__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cobalt);
  max-width: 26ch;
}

.page-about .about-partners__title {
  margin: 0 0 16px;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-partners__body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body-text);
  max-width: 62ch;
}

.page-about .about-partners__link {
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  font-size: 14px !important;
}

/* ---------- 校订机制 ---------- */
.page-about .about-cycle__grid {
  display: grid;
  gap: 30px;
  margin-top: clamp(26px, 4vw, 36px);
}

.page-about .about-cycle__body > p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--body-text);
  max-width: 60ch;
}

.page-about .about-cycle__panel {
  margin: 0 0 20px;
  border: 1px solid var(--rule);
  background: var(--sheet);
}

.page-about .about-cycle__panel .status-panel__head {
  background: rgba(18, 69, 122, .06);
}

.page-about .about-cycle__panel .status-panel__row + .status-panel__row {
  border-top: 1px solid rgba(195, 210, 220, .7);
}

.page-about .about-cycle__panel .status-panel__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cobalt);
  white-space: nowrap;
}

.page-about .about-cycle__panel .status-panel__value {
  font-size: 14px;
  line-height: 1.7;
  color: var(--body-text);
}

.page-about .about-cycle__foot {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 13px !important;
  color: var(--cobalt);
}

.page-about .about-cycle__figure {
  margin: 0;
}

.page-about .about-cycle__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--rule);
}

.page-about .about-cycle__figure .figure-frame__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--cobalt);
}

/* ---------- 数据边界 ---------- */
.page-about .about-limits__grid {
  display: grid;
  gap: 22px;
  padding-top: clamp(28px, 5vw, 40px);
  border-top: 1px solid var(--rule);
}

.page-about .about-limits__index {
  margin: 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-limits__title {
  margin: 8px 0 0;
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.28;
  color: var(--ink);
  max-width: 14ch;
}

.page-about .limit-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .limit-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

.page-about .limit-list li::before {
  counter-increment: limit;
  content: counter(limit, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cobalt);
  padding-top: 4px;
}

.page-about .about-limits__foot {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--body-text);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .scope-item__def {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-nature__grid {
    grid-template-columns: 2fr 8fr;
    column-gap: 40px;
  }

  .page-about .rail-item {
    grid-template-columns: 22px 132px minmax(0, 1fr);
    column-gap: 22px;
  }

  .page-about .rail-item__label {
    grid-column: 2;
    grid-row: 1;
    padding-top: 4px;
  }

  .page-about .rail-item__content {
    grid-column: 3;
    grid-row: 1;
    margin-top: 0;
  }

  .page-about .rail-figure {
    margin-left: 176px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: 4fr 8fr;
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-cycle__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-limits__grid {
    grid-template-columns: 3fr 9fr;
    column-gap: 40px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-limits__title {
    max-width: 12ch;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>