.page-about {
  --about-mark: 56px;
  --about-aside: 244px;
  --about-note-line: rgba(203, 216, 230, 0.14);
  display: block;
  padding-top: 104px;
  padding-bottom: 0;
  background: var(--abyss);
  color: var(--ice);
}

.page-about .about-crumb {
  padding-bottom: 10px;
}

/* ——— 首屏 ——— */
.page-about .about-hero {
  padding-top: 12px;
  padding-bottom: 8px;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ice-mid);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 76px);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -0.015em;
  color: var(--sheen);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 40em;
  color: var(--ice);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

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

.page-about .about-hero__figure .figure__media {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ——— 锚点导航 ——— */
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  margin-top: 44px;
  padding: 14px 0;
  border-top: 1px solid var(--glass-line);
  border-bottom: 1px solid var(--glass-line);
}

.page-about .about-toc__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ice-dim);
  margin-right: 4px;
}

.page-about .about-toc .anchor-nav__link {
  font-size: 14px;
  color: var(--ice-mid);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-toc .anchor-nav__link:hover,
.page-about .about-toc .anchor-nav__link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ——— 章节骨架：主栏 + 旁注栏 ——— */
.page-about .about-chapter {
  padding-top: 66px;
  padding-bottom: 10px;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-chapter__marker {
  display: none;
}

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

.page-about .about-h2 {
  margin: 0 0 22px;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.28;
  color: var(--sheen);
}

.page-about .about-chapter__body .prose p {
  margin: 0 0 20px;
  color: var(--ice);
}

.page-about .about-chapter__body .prose a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 245, 160, 0.4);
}

.page-about .about-chapter__body .prose a:hover,
.page-about .about-chapter__body .prose a:focus-visible {
  border-bottom-color: var(--neon);
}

.page-about .about-chapter__body .prose > p:first-of-type::first-letter {
  float: left;
  margin: 6px 12px 0 0;
  font-family: var(--font-display);
  font-size: 3.1em;
  font-weight: 800;
  line-height: 0.78;
  color: var(--neon);
}

.page-about .about-lead-line {
  margin: -6px 0 30px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ice-mid);
}

/* ——— 旁注 ——— */
.page-about .about-chapter__aside,
.page-about .about-partners__aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-note {
  padding: 14px 16px 14px 16px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-left: 2px solid var(--ice-dim);
  border-radius: var(--radius);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ice-mid);
}

.page-about .about-note p {
  margin: 0;
}

.page-about .about-note__k {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--ice-dim);
  text-transform: uppercase;
}

.page-about .about-note__v {
  margin: 4px 0 8px;
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--neon);
}

/* ——— 引用块 ——— */
.page-about .about-quote {
  margin: 30px 0 0;
  padding: 22px 26px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-left: 2px solid var(--neon);
  border-radius: var(--radius);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ice);
}

/* ——— 宽幅数据条 ——— */
.page-about .about-databar {
  position: relative;
  margin: 64px 0;
  padding: 26px 0;
  background: var(--night);
  border-top: 1px solid var(--glass-line);
  border-bottom: 1px solid var(--glass-line);
}

.page-about .about-databar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 42%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), rgba(43, 245, 160, 0));
}

.page-about .about-databar--alt::before {
  background: linear-gradient(90deg, var(--flare), rgba(255, 91, 58, 0));
}

.page-about .about-databar__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
}

.page-about .about-databar__cell {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}

.page-about .about-databar__label {
  flex: 0 0 100%;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--ice-dim);
  text-transform: uppercase;
}

.page-about .about-databar__value {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.015em;
  color: var(--sheen);
}

.page-about .about-databar__unit {
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--ice-mid);
}

/* ——— 流程配图 ——— */
.page-about .about-process__figure {
  margin: 0 0 40px;
}

.page-about .about-process__figure .figure__media {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ——— 时间轴 ——— */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 6px 0 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 26px;
  left: 70px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon), var(--ice-dim) 26%, var(--ice-dim));
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 26px;
  padding-bottom: 32px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 64.5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--neon);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  transform: scale(1.35);
  box-shadow: 0 0 0 4px rgba(43, 245, 160, 0.16);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  padding-top: 6px;
  color: var(--ice-mid);
  text-align: right;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--sheen);
}

.page-about .about-timeline__text p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice-mid);
}

/* ——— 合作区块 ——— */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

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

.page-about .about-partners__figure .figure__media {
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-partners__body .prose p {
  margin: 0 0 20px;
  color: var(--ice);
}

.page-about .about-partners__body .about-chapter__marker {
  display: none;
}

/* ——— 尾部 CTA ——— */
.page-about .about-cta {
  margin-top: 72px;
  padding: 56px 0 84px;
  background: var(--night);
  border-top: 1px solid var(--glass-line);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.page-about .about-cta__copy p {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ice-mid);
}

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

/* ——— 窄屏 ——— */
@media (max-width: 640px) {
  .page-about {
    padding-top: 92px;
  }

  .page-about .about-hero__title {
    font-size: clamp(30px, 9vw, 40px);
  }

  .page-about .about-timeline::before {
    left: 60px;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-timeline__item::before {
    left: 54.5px;
  }

  .page-about .about-timeline__year {
    font-size: 11.5px;
  }

  .page-about .about-databar__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .about-chapter__body .prose > p:first-of-type::first-letter {
    font-size: 2.6em;
  }
}

/* ——— 中屏 ——— */
@media (min-width: 720px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

  .page-about .about-databar__inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
    gap: 40px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

/* ——— 宽屏 ——— */
@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 52px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-mark) minmax(0, 1fr) var(--about-aside);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-chapter__body {
    max-width: 660px;
  }

  .page-about .about-chapter__body--wide {
    max-width: none;
  }

  .page-about .about-chapter__marker {
    display: block;
    padding-top: 6px;
  }

  .page-about .about-chapter__num {
    display: block;
    writing-mode: vertical-rl;
    font-family: var(--font-display);
    font-size: 38px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0.04em;
    color: var(--ice-dim);
  }

  .page-about .about-chapter__aside {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 8px;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr) var(--about-aside);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-partners__body {
    max-width: 620px;
  }

  .page-about .about-partners__aside {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 8px;
  }

  .page-about .about-process__figure {
    margin-bottom: 52px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 22px;
  }

  .page-about .about-chapter {
    padding-top: 80px;
  }
}