.page-about {
  --about-sticky-top: calc(var(--header-h-compact) + 20px);
  background-color: var(--graphite);
  color: var(--offwhite);
  font-family: var(--font-body);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- HERO ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(18px, 4vw, 44px)) 0 clamp(30px, 5vw, 56px);
  background: linear-gradient(158deg, var(--ink) 0%, var(--teal-deep) 100%);
  border-bottom: 3px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(55, 240, 208, 0.07) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(55, 240, 208, 0.05) 0 1px, transparent 1px 88px);
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb,
.page-about .breadcrumb a {
  color: rgba(242, 239, 230, 0.72);
}

.page-about .breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 72px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--offwhite);
}

.page-about .about-hero__lede {
  max-width: 33em;
  margin: clamp(16px, 2vw, 24px) 0 0;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.78;
  color: rgba(242, 239, 230, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  background: var(--ink);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__cap {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: rgba(242, 239, 230, 0.6);
}

/* ---------- 关键数字 ---------- */

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  background: var(--line);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  background: var(--ink);
  padding: 16px 14px 14px;
}

.page-about .about-facts__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-facts__label {
  margin: 0 0 8px;
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(242, 239, 230, 0.66);
}

/* ---------- 主布局 ---------- */

.page-about .about-layout {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  padding-top: clamp(36px, 6vw, 72px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-column {
  min-width: 0;
}

.page-about .about-chapter {
  min-width: 0;
}

.page-about .about-chapter + .about-chapter {
  margin-top: clamp(32px, 4.6vw, 58px);
  padding-top: clamp(26px, 3.6vw, 44px);
  border-top: 2px solid var(--line);
}

.page-about .about-chapter__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 33px);
  line-height: 1.36;
  letter-spacing: 0.01em;
  color: var(--offwhite);
}

.page-about .about-chapter__body {
  margin-top: 16px;
}

.page-about .about-chapter__body p {
  max-width: 34em;
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(242, 239, 230, 0.84);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  background: var(--stone);
  border-top: 3px solid var(--cyan-dim);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  padding: 11px 14px;
  border-top: 2px solid var(--line);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.65;
  color: rgba(242, 239, 230, 0.62);
}

/* ---------- 流程链 ---------- */

.page-about .about-chain {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .about-chain__step {
  background: var(--stone);
  padding: 14px 16px;
  border-left: 3px solid var(--cyan-dim);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .about-chain__step:hover,
.page-about .about-chain__step:focus-within {
  border-left-color: var(--cyan);
  background: var(--moss);
  transform: translateX(2px);
}

.page-about .about-chain__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-chain__name {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--offwhite);
}

.page-about .about-chain__note {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(242, 239, 230, 0.7);
}

/* ---------- 版本号 ---------- */

.page-about .about-version {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--offwhite);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-version__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .about-version__code {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4vw, 38px);
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--teal-deep);
  word-break: break-word;
}

.page-about .about-version__parts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 18px 0 0;
  background: rgba(14, 31, 26, 0.22);
}

.page-about .about-version__parts > div {
  background: var(--offwhite);
  padding: 10px 12px;
}

.page-about .about-version__parts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--moss);
}

.page-about .about-version__parts dd {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--moss);
}

/* ---------- 年份账本 ---------- */

.page-about .about-ledger {
  min-width: 0;
}

.page-about .about-ledger__inner {
  background: var(--stone);
  border-top: 3px solid var(--cyan);
  padding: clamp(18px, 2.2vw, 28px);
}

.page-about .about-ledger__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(242, 239, 230, 0.55);
}

.page-about .about-ledger__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-ledger__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-ledger__row:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-ledger__year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-ledger__desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(242, 239, 230, 0.76);
}

/* ---------- 折线图 ---------- */

.page-about .about-chart {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 2px solid var(--line);
}

.page-about .about-chart__cap {
  margin: 0 0 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(242, 239, 230, 0.58);
}

.page-about .about-chart__svg {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-chart__grid line {
  stroke: rgba(61, 67, 64, 0.85);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.page-about .about-chart__axis line {
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .about-chart__area {
  fill: rgba(55, 240, 208, 0.1);
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.page-about .about-chart__pt circle {
  fill: var(--cyan-dim);
  stroke: var(--stone);
  stroke-width: 2;
  transition: fill 0.16s var(--ease), r 0.16s var(--ease);
}

.page-about .about-chart__pt:hover circle {
  fill: var(--cyan);
  r: 5.5;
}

.page-about .about-chart__pt text {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  text-anchor: middle;
  fill: rgba(242, 239, 230, 0.74);
  transition: fill 0.16s var(--ease);
}

.page-about .about-chart__pt:hover text {
  fill: var(--cyan);
}

.page-about .about-chart__yr {
  fill: rgba(242, 239, 230, 0.42);
  font-size: 7.5px;
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  background: var(--moss);
  border-top: 3px solid var(--line);
  border-bottom: 3px solid var(--line);
  padding: clamp(34px, 5vw, 64px) 0;
}

.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 48px);
}

.page-about .about-partners__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.35;
  color: var(--offwhite);
}

.page-about .about-partners__copy p {
  max-width: 34em;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.84);
}

.page-about .about-partners__copy .btn {
  margin-top: 22px;
}

.page-about .about-partners__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: rgba(14, 31, 26, 0.35);
  border-top: 2px solid rgba(242, 239, 230, 0.28);
  border-bottom: 2px solid rgba(242, 239, 230, 0.28);
}

.page-about .about-partners__stats li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  background: var(--moss);
}

.page-about .about-partners__num {
  flex: 0 0 auto;
  min-width: 2.2em;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-partners__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(242, 239, 230, 0.82);
}

/* ---------- 收束 ---------- */

.page-about .about-cta {
  background: var(--ink);
  padding: clamp(34px, 5vw, 64px) 0;
}

.page-about .about-cta__grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.35;
  color: var(--offwhite);
}

.page-about .about-cta p {
  max-width: 36em;
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(242, 239, 230, 0.82);
}

.page-about .about-cta__actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  width: 100%;
  text-align: center;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cta__actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .page-about .about-cta__actions .btn {
    width: auto;
  }
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-facts__item {
    padding: 20px 18px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-ledger__inner {
    position: sticky;
    top: var(--about-sticky-top);
  }
}
<<<END>>>