.page-about {
  --about-rail: 34px;
  --about-gap: 16px;
  --about-pad-x: 20px;
  background: var(--paper-50);
  color: var(--text-900);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--about-pad-x);
  box-sizing: border-box;
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--rock-500);
  padding-top: 6px;
}

.page-about .breadcrumb a {
  color: var(--rock-500);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--court-600);
}

.page-about .breadcrumb-sep {
  margin-inline: 8px;
  color: var(--line-300);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 26px 0 54px;
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(44, 107, 78, 0.12), transparent 62%),
    radial-gradient(90% 80% at 100% 0%, rgba(200, 94, 44, 0.08), transparent 58%),
    var(--paper-50);
  border-bottom: 1px solid var(--line-300);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
  margin-top: 26px;
}

.page-about .hero-copy .eyebrow {
  margin: 0;
}

.page-about .hero-copy h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(33px, 7.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .hero-copy .lede {
  margin: 22px 0 0;
  max-width: 54ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .hero-aside {
  border-top: 2px solid var(--court-600);
  padding-top: 16px;
}

.page-about .aside-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--rock-500);
}

.page-about .hero-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero-track li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .hero-track li:first-child {
  border-top: 1px solid var(--line-300);
}

.page-about .track-year {
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--court-600);
}

.page-about .track-text {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-700);
}

/* ---------- 编年史骨架 ---------- */

.page-about .chronicle {
  padding-top: 8px;
}

.page-about .chronicle--second {
  padding-top: 0;
}

.page-about .chapter {
  display: grid;
  grid-template-columns: var(--about-rail) minmax(0, 1fr);
  column-gap: var(--about-gap);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0 var(--about-pad-x) 56px;
  box-sizing: border-box;
}

.page-about .chapter-rail {
  position: relative;
  grid-column: 1;
  grid-row: 1 / -1;
  display: flex;
  justify-content: center;
}

.page-about .chapter-rail::before {
  content: "";
  position: absolute;
  top: var(--about-rail);
  bottom: -56px;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: var(--line-300);
}

.page-about .chapter--last .chapter-rail::before {
  display: none;
}

.page-about .chapter-mark {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: var(--about-rail);
  height: var(--about-rail);
  border-radius: 50%;
  border: 1px solid var(--line-300);
  background: var(--paper-50);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--rock-500);
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .chapter:hover .chapter-mark {
  background: var(--court-600);
  border-color: var(--court-600);
  color: var(--paper-50);
}

.page-about .chapter-main {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-about .chapter-aside {
  grid-column: 2;
  grid-row: 2;
  margin-top: 26px;
  min-width: 0;
}

.page-about .chapter--wide .chapter-main,
.page-about .chapter--solo .chapter-main {
  grid-column: 2 / -1;
}

.page-about .chapter-main h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .chapter-main p {
  margin: 0 0 0.9em;
  max-width: var(--measure);
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-900);
}

/* ---------- 旁注 ---------- */

.page-about .aside-figure {
  margin: 0;
}

.page-about .chapter-aside .media-frame {
  aspect-ratio: 4 / 3;
}

.page-about .aside-caption {
  margin: 11px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--rock-500);
}

.page-about .aside-note {
  background: var(--paper-200);
  border-left: 2px solid var(--court-600);
  padding: 16px 18px;
  margin-bottom: 16px;
}

.page-about .aside-note--plain {
  border-left-color: var(--line-300);
}

.page-about .aside-note .note-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--rock-500);
}

.page-about .aside-note p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 五项要素 ---------- */

.page-about .field-list {
  list-style: none;
  margin: 26px 0 30px;
  padding: 0;
  max-width: var(--measure);
  border-top: 1px solid var(--line-300);
}

.page-about .field-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .field-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--court-600);
  padding-top: 4px;
}

.page-about .field-list h3 {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .field-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-700);
}

/* ---------- 年份时间线 ---------- */

.page-about .era-figure {
  margin: 24px 0 30px;
}

.page-about .era-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 100%;
}

.page-about .era {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0;
  border-top: 1px solid var(--line-300);
}

.page-about .era:last-child {
  border-bottom: 1px solid var(--line-300);
}

.page-about .era-year {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8vw, 58px);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--court-600);
}

.page-about .era-body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .era-body p {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 纯文字区块 ---------- */

.page-about .creed {
  margin: 8px 0 0;
  padding: 56px 0;
  background: var(--ink-900);
  color: var(--paper-50);
}

.page-about .creed-rule {
  display: block;
  width: 52px;
  height: 3px;
  margin-bottom: 26px;
  background: var(--volt-400);
}

.page-about .creed-text {
  margin: 0;
  max-width: 26em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 4.6vw, 30px);
  line-height: 1.68;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .creed-foot {
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--court-300);
}

/* ---------- 团队 ---------- */

.page-about .team-list {
  margin: 24px 0 22px;
  max-width: var(--measure);
  border-top: 1px solid var(--line-300);
}

.page-about .team-list > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .team-list dt {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--court-600);
}

.page-about .team-list dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-700);
}

/* ---------- 四件事 ---------- */

.page-about .pledge-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  max-width: 100%;
}

.page-about .pledge-list li {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  padding: 19px 0;
  border-top: 1px solid var(--line-300);
}

.page-about .pledge-list li:last-child {
  border-bottom: 1px solid var(--line-300);
}

.page-about .pledge-num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--clay-700);
  padding-top: 4px;
}

.page-about .pledge-list h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .pledge-list p {
  margin: 0;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 规模表 ---------- */

.page-about .scale-list {
  list-style: none;
  margin: 24px 0 26px;
  padding: 0;
  max-width: 100%;
  border-top: 1px solid var(--line-300);
}

.page-about .scale-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 2px;
  border-bottom: 1px solid var(--line-300);
}

.page-about .scale-label {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-700);
}

.page-about .scale-value {
  flex: none;
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--court-600);
  white-space: nowrap;
}

.page-about .scale-value em {
  font-style: normal;
  font-size: 12.5px;
  color: var(--rock-500);
  margin-left: 3px;
}

.page-about .scale-tail {
  max-width: var(--measure);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about {
    --about-pad-x: 28px;
  }

  .page-about .team-list > div {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .era {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 44px;
    --about-gap: 44px;
    --about-pad-x: 40px;
  }

  .page-about .about-hero {
    padding: 34px 0 76px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 72px;
    align-items: start;
    margin-top: 44px;
  }

  .page-about .hero-copy .lede {
    font-size: 17.5px;
  }

  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 7fr) minmax(0, 4fr);
    column-gap: 48px;
    padding-bottom: 88px;
  }

  .page-about .chapter-rail {
    grid-row: 1;
  }

  .page-about .chapter-rail::before {
    bottom: -88px;
  }

  .page-about .chapter-main {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .chapter-aside {
    grid-column: 3;
    grid-row: 1;
    margin-top: 4px;
  }

  .page-about .chapter--wide .chapter-main,
  .page-about .chapter--solo .chapter-main {
    grid-column: 2 / -1;
  }

  .page-about .creed {
    padding: 104px 0;
  }

  .page-about .era {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 44px;
    padding: 26px 0;
  }

  .page-about .era-figure {
    margin: 30px 0 38px;
  }

  .page-about .scale-list {
    max-width: 760px;
  }

  .page-about .scale-value {
    font-size: 24px;
  }
}
<<<PAGE_CSS_END>>>