.page-about {
  --about-line: 1px solid var(--grid);
  --about-ease: 140ms var(--ease);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about .about-top {
  padding-top: 20px;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 14px;
  padding-bottom: 40px;
  scroll-margin-top: calc(var(--ticker-h) + 16px);
}

.page-about .about-kicker {
  margin: 0 0 16px;
}

.page-about .about-h1 {
  margin: 0 0 18px;
  font-family: var(--sans);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(1.85rem, 6.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-lead {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-lead--sub {
  font-size: 0.925rem;
  color: var(--muted);
}

.page-about .about-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__fig {
  align-self: end;
}

/* 章节索引条 */
.page-about .about-index {
  display: flex;
  overflow-x: auto;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index a {
  flex: 0 0 auto;
  padding: 12px 16px;
  border-right: var(--about-line);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--about-ease), background-color var(--about-ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--void);
  background: var(--cyan);
}

/* 章节骨架 */
.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 42px;
  padding-bottom: 42px;
  scroll-margin-top: calc(var(--ticker-h) + 16px);
}

.page-about .chapter::before {
  content: "";
  grid-column: 1 / -1;
  height: 1px;
  margin-bottom: 26px;
  background: var(--grid);
}

.page-about .chapter--end {
  padding-bottom: 64px;
}

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .chapter__num {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about .chapter__word {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

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

.page-about .chapter h2 {
  margin: 0 0 16px;
  font-size: clamp(1.3rem, 3.4vw, 1.95rem);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .chapter p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 0.975rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .chapter__hint {
  margin-top: 16px !important;
  font-size: 0.78rem !important;
  letter-spacing: 0.04em;
  color: var(--dim) !important;
}

.page-about .link-inline {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--cyan);
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--about-ease), border-color var(--about-ease);
}

.page-about .link-inline:hover,
.page-about .link-inline:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* 图片展签 */
.page-about .ab-fig {
  margin: 22px 0 0;
  border: var(--about-line);
  background: var(--panel);
}

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

.page-about .ab-fig__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 10px 12px;
  border-top: 1px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.page-about .ab-fig__no {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  white-space: nowrap;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 1px;
}

/* 版本时间轴 */
.page-about .tl {
  position: relative;
  margin: 26px 0 0;
}

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

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .tl__node {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px 12px;
  padding: 16px;
  border: var(--about-line);
  border-left: 3px solid var(--grid);
  background: var(--field);
  transition: border-color var(--about-ease), background-color var(--about-ease);
  outline-offset: 2px;
}

.page-about .tl__node:hover,
.page-about .tl__node:focus-visible {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--panel);
}

.page-about .tl__node--live {
  border-left-color: var(--orange);
}

.page-about .tl__node--live:hover,
.page-about .tl__node--live:focus-visible {
  border-left-color: var(--orange);
}

.page-about .tl__ver {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.45rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .tl__node .tag {
  grid-column: 1 / -1;
  justify-self: start;
}

.page-about .tl__cap {
  grid-column: 1 / -1;
  max-height: none;
  opacity: 1;
  margin-top: 6px;
  padding-top: 10px;
  border-top: var(--about-line);
  transition: opacity var(--about-ease);
}

.page-about .tl__cap p {
  margin: 0;
  max-width: none;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

/* 数据块矩阵 */
.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0;
  border: var(--about-line);
  background: var(--grid);
}

.page-about .metric {
  padding: 18px 14px;
  background: var(--field);
  transition: background-color var(--about-ease);
}

.page-about .metric:hover {
  background: var(--panel);
}

.page-about .metric__num {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  transition: color var(--about-ease);
}

.page-about .metric:hover .metric__num {
  color: var(--amber);
}

.page-about .metric__unit {
  margin-left: 4px;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}

.page-about .metric__label {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--muted);
}

/* 横向数据条 */
.page-about .strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 24px 0;
  border: var(--about-line);
  background: var(--panel);
}

.page-about .strip__item {
  padding: 16px;
  border-bottom: var(--about-line);
}

.page-about .strip__item:last-child {
  border-bottom: none;
}

.page-about .strip__num {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .strip__unit {
  margin-left: 3px;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about .strip__label {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 条目行 */
.page-about .rowlist {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .rowlist li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 13px 0;
  border-bottom: var(--about-line);
  transition: border-color var(--about-ease);
}

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

.page-about .rowlist__k {
  font-size: 0.875rem;
  color: var(--muted);
}

.page-about .rowlist__v {
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.page-about .rowlist--tight li {
  padding: 11px 0;
}

/* 联系出口 */
.page-about .reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 22px 0;
  border: var(--about-line);
  background: var(--grid);
}

.page-about .reach__cell {
  padding: 14px 16px;
  background: var(--field);
}

.page-about .reach__k {
  margin: 0 0 6px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .reach__v {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .reach__v--text {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--text);
}

.page-about .reach__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: none;
}

@media (min-width: 720px) {
  .page-about .metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .strip__item {
    border-bottom: none;
    border-right: var(--about-line);
  }

  .page-about .strip__item:last-child {
    border-right: none;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: var(--gutter);
    align-items: end;
    padding-top: 22px;
    padding-bottom: 60px;
  }

  .page-about .chapter {
    grid-template-columns: 116px minmax(0, 1fr);
    column-gap: 56px;
    row-gap: 0;
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .page-about .chapter::before {
    margin-inline: 96px;
    margin-bottom: 42px;
  }

  .page-about .chapter--end {
    padding-bottom: 92px;
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 0;
    align-self: start;
    position: sticky;
    top: calc(var(--ticker-h) + 32px);
  }

  .page-about .chapter__word {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    line-height: 1;
    letter-spacing: 0.32em;
  }

  .page-about .tl__rail {
    display: block;
    width: 100%;
    height: 10px;
    margin-bottom: 26px;
  }

  .page-about .tl__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gutter);
  }

  .page-about .tl__node {
    align-content: start;
    min-height: 84px;
  }

  .page-about .tl__cap {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    overflow: hidden;
    transition: max-height 220ms var(--ease), opacity 160ms var(--ease),
      margin-top 220ms var(--ease), padding-top 220ms var(--ease);
  }

  .page-about .tl__node:hover .tl__cap,
  .page-about .tl__node:focus-within .tl__cap,
  .page-about .tl__node:focus .tl__cap {
    max-height: 260px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--grid);
  }

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

  .page-about .ab-fig {
    margin-top: 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    column-gap: 48px;
  }

  .page-about .chapter {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .tl__node,
  .page-about .tl__cap,
  .page-about .metric,
  .page-about .metric__num,
  .page-about .rowlist li,
  .page-about .link-inline {
    transition: none;
  }
}

.page-about {
  --about-line: 1px solid var(--grid);
  --about-ease: 140ms var(--ease);
  color: var(--text);
  font-family: var(--sans);
  overflow-x: hidden;
}

.page-about .about-top {
  padding-top: 20px;
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 14px;
  padding-bottom: 40px;
  scroll-margin-top: calc(var(--ticker-h) + 16px);
}

.page-about .about-kicker {
  margin: 0 0 16px;
}

.page-about .about-h1 {
  margin: 0 0 18px;
  font-family: var(--sans);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(1.85rem, 6.2vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-lead {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-lead--sub {
  font-size: 0.925rem;
  color: var(--muted);
}

.page-about .about-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__fig {
  align-self: end;
}

.page-about .about-index {
  display: flex;
  overflow-x: auto;
  border-top: var(--about-line);
  border-bottom: var(--about-line);
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index a {
  flex: 0 0 auto;
  padding: 12px 16px;
  border-right: var(--about-line);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--about-ease), background-color var(--about-ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--void);
  background: var(--cyan);
}

.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: 42px;
  padding-bottom: 42px;
  scroll-margin-top: calc(var(--ticker-h) + 16px);
}

.page-about .chapter::before {
  content: "";
  grid-column: 1 / -1;
  height: 1px;
  margin-bottom: 26px;
  background: var(--grid);
}

.page-about .chapter--end {
  padding-bottom: 64px;
}

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .chapter__num {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about .chapter__word {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

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

.page-about .chapter h2 {
  margin: 0 0 16px;
  font-size: clamp(1.3rem, 3.4vw, 1.95rem);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .chapter p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 0.975rem;
  line-height: 1.8;
  color: var(--text);
}

.page-about .chapter__hint {
  margin-top: 16px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.page-about .link-inline {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--cyan);
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--about-ease), border-color var(--about-ease);
}

.page-about .link-inline:hover,
.page-about .link-inline:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-fig {
  margin: 22px 0 0;
  border: var(--about-line);
  background: var(--panel);
}

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

.page-about .ab-fig__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 10px 12px;
  border-top: 1px solid var(--ink);
  background: var(--cream);
  color: var(--ink);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.page-about .ab-fig__no {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink);
  white-space: nowrap;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 1px;
}

.page-about .tl {
  position: relative;
  margin: 26px 0 0;
}

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

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .tl__node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 8px 12px;
  padding: 16px;
  border: var(--about-line);
  border-left: 3px solid var(--grid);
  background: var(--field);
  outline-offset: 2px;
  transition: border-color var(--about-ease), background-color var(--about-ease);
}

.page-about .tl__node:hover,
.page-about .tl__node:focus-visible {
  border-color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--panel);
}

.page-about .tl__node--live {
  border-left-color: var(--orange);
}

.page-about .tl__node--live:hover,
.page-about .tl__node--live:focus-visible {
  border-left-color: var(--orange);
}

.page-about .tl__ver {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.45rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .tl__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .tl__node .tag {
  grid-column: 1 / -1;
  justify-self: start;
}

.page-about .tl__cap {
  grid-column: 1 / -1;
  max-height: none;
  opacity: 1;
  margin-top: 6px;
  padding-top: 10px;
  border-top: var(--about-line);
  overflow: hidden;
  transition: opacity var(--about-ease);
}

.page-about .tl__cap p {
  margin: 0;
  max-width: none;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0;
  border: var(--about-line);
  background: var(--grid);
}

.page-about .metric {
  padding: 18px 14px;
  background: var(--field);
  transition: background-color var(--about-ease);
}

.page-about .metric:hover {
  background: var(--panel);
}

.page-about .metric__num {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  transition: color var(--about-ease);
}

.page-about .metric:hover .metric__num {
  color: var(--amber);
}

.page-about .metric__unit {
  margin-left: 4px;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--muted);
}

.page-about .metric__label {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .strip {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: 24px 0;
  border: var(--about-line);
  background: var(--panel);
}

.page-about .strip__item {
  padding: 16px;
  border-bottom: var(--about-line);
}

.page-about .strip__item:last-child {
  border-bottom: none;
}

.page-about .strip__num {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .strip__unit {
  margin-left: 3px;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
}

.page-about .strip__label {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .rowlist {
  list-style: none;
  margin: 22px 0;
  padding: 0;
  border-top: var(--about-line);
}

.page-about .rowlist li {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 13px 0;
  border-bottom: var(--about-line);
  transition: border-color var(--about-ease);
}

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

.page-about .rowlist__k {
  font-size: 0.875rem;
  color: var(--muted);
}

.page-about .rowlist__v {
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.page-about .rowlist--tight li {
  padding: 11px 0;
}

.page-about .reach {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 22px 0;
  border: var(--about-line);
  background: var(--grid);
}

.page-about .reach__cell {
  padding: 14px 16px;
  background: var(--field);
}

.page-about .reach__k {
  margin: 0 0 6px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .reach__v {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .reach__v--text {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--text);
}

.page-about .reach__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: none;
}

@media (min-width: 720px) {
  .page-about .metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .strip__item {
    border-bottom: none;
    border-right: var(--about-line);
  }

  .page-about .strip__item:last-child {
    border-right: none;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: var(--gutter);
    align-items: end;
    padding-top: 22px;
    padding-bottom: 60px;
  }

  .page-about .chapter {
    grid-template-columns: 116px minmax(0, 1fr);
    column-gap: 56px;
    row-gap: 0;
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .page-about .chapter::before {
    margin-inline: 96px;
    margin-bottom: 42px;
  }

  .page-about .chapter--end {
    padding-bottom: 92px;
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 0;
    align-self: start;
    position: sticky;
    top: calc(var(--ticker-h) + 32px);
  }

  .page-about .chapter__word {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    line-height: 1;
    letter-spacing: 0.32em;
  }

  .page-about .tl__rail {
    display: block;
    width: 100%;
    height: 10px;
    margin-bottom: 26px;
  }

  .page-about .tl__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gutter);
  }

  .page-about .tl__node {
    align-content: start;
    min-height: 96px;
  }

  .page-about .tl__cap {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 220ms var(--ease), opacity 160ms var(--ease),
      margin-top 220ms var(--ease), padding-top 220ms var(--ease);
  }

  .page-about .tl__node:hover .tl__cap,
  .page-about .tl__node:focus-within .tl__cap,
  .page-about .tl__node:focus .tl__cap {
    max-height: 260px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--grid);
  }

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

  .page-about .ab-fig {
    margin-top: 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero {
    column-gap: 48px;
  }

  .page-about .chapter {
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index a,
  .page-about .tl__node,
  .page-about .tl__cap,
  .page-about .metric,
  .page-about .metric__num,
  .page-about .rowlist li,
  .page-about .link-inline {
    transition: none;
  }
}