.page-about {
  --about-era-rail: 148px;
  --mod-accent: var(--peacock);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: 26px 0 6px;
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border: var(--frame) solid var(--deep);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
  padding: 30px 20px 34px;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(115deg, rgba(15, 110, 140, 0.055) 0 2px, transparent 2px 26px),
    repeating-linear-gradient(-25deg, rgba(194, 94, 42, 0.045) 0 2px, transparent 2px 34px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  font-size: clamp(2rem, 5vw, 3.4rem);
  color: var(--deep);
  margin: 16px 0 18px;
}

.page-about .about-hero__lede {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 24px;
  max-width: 40em;
}

.page-about .about-hero__ledger {
  border-left: 4px solid var(--cyan);
  background: var(--paper-dim);
  padding: 4px 16px;
}

/* ---------- 发展阶段 ---------- */
.page-about .era-figure {
  margin: 0 0 40px;
}

.page-about .era-flow {
  position: relative;
}

.page-about .era-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .era-item {
  display: grid;
  gap: 10px;
  padding-bottom: 34px;
  position: relative;
}

.page-about .era-item:last-child {
  padding-bottom: 0;
}

.page-about .era-mark {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--peacock);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .era-mark::after {
  content: "";
  flex: 1;
  height: 3px;
  background: var(--line);
}

.page-about .era-item__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--deep);
  margin: 0 0 10px;
}

.page-about .era-item__body p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 服务模块带 ---------- */
.page-about .mod-band {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .mod {
  border: 3px solid var(--deep);
  border-bottom-width: 0;
  background: var(--paper);
  padding: 28px 18px 24px;
  box-shadow: inset 0 6px 0 var(--mod-accent);
}

.page-about .mod:last-child {
  border-bottom-width: 3px;
}

.page-about .mod:nth-child(1) { --mod-accent: var(--peacock); }
.page-about .mod:nth-child(2) { --mod-accent: var(--ochre); }
.page-about .mod:nth-child(3) { --mod-accent: var(--gold); }
.page-about .mod:nth-child(4) { --mod-accent: var(--cyan); }
.page-about .mod:nth-child(5) { --mod-accent: var(--ink); }

.page-about .mod:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .mod__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mod-accent);
  border: 2px solid var(--mod-accent);
  padding: 2px 7px;
}

.page-about .mod__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--deep);
  margin: 14px 0 8px;
}

.page-about .mod__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .mod__scene {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--ink);
  border-left: 3px solid var(--mod-accent);
  padding-left: 10px;
  transition: max-height 0.24s var(--ease), opacity 0.24s var(--ease), margin-top 0.24s var(--ease);
}

.page-about .mod:hover .mod__scene,
.page-about .mod:focus-within .mod__scene {
  max-height: 14em;
  opacity: 1;
  margin-top: 12px;
}

.page-about .mod-figure {
  margin: 44px 0 0;
}

/* ---------- 区域对接 ---------- */
.page-about .region-grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .region {
  border: 3px solid var(--deep);
  background: var(--paper);
  box-shadow: var(--shadow-hard-sm);
}

.page-about .region[open] {
  background: var(--paper-dim);
  box-shadow: var(--shadow-hard);
}

.page-about .region__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .region__head::-webkit-details-marker {
  display: none;
}

.page-about .region__head:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: -3px;
}

.page-about .region__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--paper);
  background: var(--deep);
  padding: 3px 7px;
}

.page-about .region__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  color: var(--deep);
}

.page-about .region__toggle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--peacock);
}

.page-about .region__toggle::after {
  content: "展开";
}

.page-about .region[open] .region__toggle::after {
  content: "收起";
}

.page-about .region__panel {
  padding: 0 16px 18px;
  border-top: 2px dashed var(--line);
}

.page-about .region__panel p {
  margin: 14px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .region__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about .region__meta span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--deep);
  border: 2px solid var(--line);
  background: var(--paper);
  padding: 2px 8px;
}

.page-about .region-figure {
  margin: 44px 0 0;
}

/* ---------- 行业场景 ---------- */
.page-about .industry-grid {
  margin-top: 26px;
}

.page-about .industry-card {
  border-left: 5px solid var(--gold);
}

/* ---------- 合作支持 ---------- */
.page-about .support-grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .support {
  border: 3px solid var(--deep);
  background: var(--paper);
  padding: 22px 18px 24px;
  box-shadow: var(--shadow-hard-sm);
}

.page-about .support__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ochre);
  margin: 0 0 12px;
}

.page-about .support__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  color: var(--deep);
  margin: 0 0 10px;
}

.page-about .support__body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 备案档案 ---------- */
.page-about .record-card {
  position: relative;
  display: grid;
  gap: 26px;
  border: 3px solid var(--deep);
  background: var(--paper);
  box-shadow: var(--shadow-hard);
  padding: 32px 20px 28px;
  overflow: hidden;
}

.page-about .record-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 58px;
  height: 58px;
  background: linear-gradient(225deg, var(--gold) 0 50%, transparent 50%);
}

.page-about .record-card__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.375rem, 3.4vw, 1.875rem);
  letter-spacing: -0.015em;
  color: var(--deep);
  margin: 14px 0 12px;
}

.page-about .record-card__body {
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .record-card__ledger {
  border-top: 3px solid var(--cyan);
  background: var(--paper-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .region-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .support-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 800px) {
  .page-about .era-item {
    grid-template-columns: var(--about-era-rail) 1fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .era-mark {
    display: block;
    text-align: right;
    padding-top: 3px;
  }

  .page-about .era-mark::after {
    display: none;
  }

  .page-about .era-list::before {
    content: "";
    position: absolute;
    left: calc(var(--about-era-rail) + 17px);
    top: 10px;
    bottom: 10px;
    width: 3px;
    background: repeating-linear-gradient(to bottom, var(--line) 0 12px, transparent 12px 22px);
  }

  .page-about .era-item::before {
    content: "";
    position: absolute;
    left: calc(var(--about-era-rail) + 13px);
    top: 6px;
    width: 11px;
    height: 11px;
    background: var(--cyan);
    border: 2px solid var(--deep);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.45fr 1fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .about-hero__frame {
    padding: 44px 40px 48px;
  }

  .page-about .mod-band {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    margin-top: 40px;
  }

  .page-about .mod {
    border-left-width: 0;
    border-bottom-width: 3px;
    padding: 30px 16px 26px;
  }

  .page-about .mod:first-child {
    border-left-width: 3px;
  }

  .page-about .record-card {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 44px 40px 40px;
    align-items: start;
  }
}

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

@media (hover: none) {
  .page-about .mod__scene {
    max-height: 14em;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .mod__scene {
    transition: none;
  }
}
<<<END>>>