.page-about {
  --ab-aside: 176px;
  --ab-rule: rgba(216, 200, 180, 0.55);
  --ab-grid-line: rgba(216, 200, 180, 0.38);
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about .container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 40px) clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background-color: var(--paper);
  background-image:
    linear-gradient(160deg, rgba(255, 249, 239, 0.92) 0%, rgba(246, 238, 223, 0.55) 62%, rgba(181, 58, 45, 0.06) 100%),
    repeating-linear-gradient(0deg, transparent 0 31px, var(--ab-grid-line) 31px 32px),
    repeating-linear-gradient(90deg, transparent 0 31px, var(--ab-grid-line) 31px 32px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .about-hero__mark {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  min-width: 0;
}

.page-about .about-hero__seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  background-color: var(--cinnabar);
  color: var(--white);
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.1;
  writing-mode: vertical-rl;
  box-shadow: 4px 4px 0 0 rgba(140, 47, 39, 0.18);
}

.page-about .about-hero__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--indigo);
  text-transform: uppercase;
  white-space: nowrap;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: 0.005em;
  color: var(--ink);
  max-width: 18em;
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(0.95rem, 1.6vw, 1.0625rem);
  color: var(--ink);
}

.page-about .about-hero__index {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__index li {
  background-color: var(--paper-hi);
  min-width: 0;
}

.page-about .about-hero__index a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 12px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-hero__index a:hover,
.page-about .about-hero__index a:focus-visible {
  background-color: var(--cinnabar);
  color: var(--white);
}

.page-about .about-hero__idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cinnabar);
}

.page-about .about-hero__index a:hover .about-hero__idx,
.page-about .about-hero__index a:focus-visible .about-hero__idx {
  color: var(--paper-hi);
}

/* ---------- Divider ---------- */
.page-about .about-divider {
  color: var(--bronze);
  opacity: 0.62;
  padding-inline: var(--gutter);
  max-width: var(--wrap);
  margin-inline: auto;
}

.page-about .about-divider svg {
  display: block;
  width: 100%;
  height: 22px;
}

/* ---------- Chapter shell ---------- */
.page-about .chapter {
  padding-block: clamp(38px, 6vw, 76px);
}

.page-about .chapter--tint {
  background-color: rgba(255, 249, 239, 0.62);
  border-block: 1px solid var(--line);
}

.page-about .chapter--dark {
  background-color: var(--ink);
  color: var(--paper-hi);
  border-block: 1px solid var(--ink);
}

.page-about .chapter__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .chapter__aside {
  min-width: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.page-about .chapter--dark .chapter__aside {
  border-bottom-color: rgba(246, 238, 223, 0.28);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5.6vw, 2.9rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--cinnabar);
  font-weight: 700;
}

.page-about .chapter--dark .chapter__num {
  color: var(--bronze);
}

.page-about .chapter__year {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--indigo);
}

.page-about .chapter--dark .chapter__year {
  color: #E4C98F;
}

.page-about .chapter__kicker {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--jade);
  margin-left: auto;
}

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

.page-about .chapter__body h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.4vw, 2.05rem);
  line-height: 1.25;
  color: var(--ink);
}

.page-about .chapter--dark .chapter__body h2 {
  color: var(--paper-hi);
}

.page-about .chapter__lead {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 34em;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .chapter--dark .chapter__lead {
  color: rgba(255, 249, 239, 0.86);
}

.page-about .chapter__body .prose {
  max-width: 34em;
}

.page-about .chapter__body .prose p {
  margin: 0 0 1.05em;
}

.page-about .chapter--dark .chapter__body .prose p {
  color: rgba(255, 249, 239, 0.9);
}

/* ---------- Figures ---------- */
.page-about .about-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
  border: 1px solid var(--line);
  background-color: var(--paper-hi);
}

.page-about .chapter--dark .about-figure {
  border-color: rgba(246, 238, 223, 0.3);
  background-color: rgba(255, 249, 239, 0.06);
}

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

.page-about .about-figure .img-frame__cap {
  display: block;
  padding: 8px 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--indigo);
}

.page-about .chapter--dark .about-figure .img-frame__cap {
  border-top-color: rgba(246, 238, 223, 0.3);
  color: #E4C98F;
}

/* ---------- Principles ---------- */
.page-about .about-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-principles__item {
  background-color: var(--paper-hi);
  padding: 18px clamp(14px, 3vw, 24px) 20px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  transition: background-color 0.26s var(--ease);
}

.page-about .about-principles__item:hover {
  background-color: #FFFFFF;
}

.page-about .about-principles__no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--cinnabar);
  padding-top: 5px;
}

.page-about .about-principles__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-principles__text {
  margin: 4px 0 0;
  grid-column: 2;
  font-size: 0.9375rem;
  color: var(--ink);
}

.page-about .about-link {
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  font-weight: 500;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cinnabar-deep);
  border-bottom-width: 2px;
}

/* ---------- Evolution timeline ---------- */
.page-about .evo {
  display: grid;
  gap: 12px;
  counter-reset: evo;
}

.page-about .evo__item {
  border: 1px solid var(--line);
  border-left: 3px solid var(--cinnabar);
  background-color: var(--paper-hi);
}

.page-about .evo__details > summary {
  list-style: none;
  cursor: pointer;
}

.page-about .evo__details > summary::-webkit-details-marker {
  display: none;
}

.page-about .evo__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 12px;
  min-height: 44px;
  padding: 14px 16px;
  transition: background-color 0.24s var(--ease);
}

.page-about .evo__head:hover {
  background-color: rgba(181, 58, 45, 0.06);
}

.page-about .evo__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--indigo);
}

.page-about .evo__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ink);
}

.page-about .evo__sum {
  grid-column: 2 / 3;
  font-size: 0.875rem;
  color: rgba(42, 33, 28, 0.76);
}

.page-about .evo__toggle {
  grid-column: 3;
  grid-row: 1 / span 2;
  position: relative;
  width: 22px;
  height: 22px;
  flex: none;
}

.page-about .evo__toggle::before,
.page-about .evo__toggle::after {
  content: "";
  position: absolute;
  inset: 50% 0 auto 0;
  height: 1px;
  background-color: var(--cinnabar);
  transition: transform 0.26s var(--ease);
}

.page-about .evo__toggle::after {
  transform: rotate(90deg);
}

.page-about .evo__details[open] .evo__toggle::after {
  transform: rotate(0deg);
}

.page-about .evo__body {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .evo__body p {
  margin: 0 0 0.85em;
  max-width: 34em;
  font-size: 0.9375rem;
}

.page-about .evo__list {
  margin: 0 0 0.9em;
  padding-left: 1.1em;
  max-width: 34em;
  font-size: 0.9375rem;
}

.page-about .evo__list li {
  margin-bottom: 0.35em;
}

.page-about .evo__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--jade);
  margin: 0;
}

/* ---------- Evidence ---------- */
.page-about .evidence {
  display: grid;
  gap: 1px;
  background-color: rgba(246, 238, 223, 0.28);
  border: 1px solid rgba(246, 238, 223, 0.28);
}

.page-about .evidence__cell {
  background-color: var(--ink);
  padding: 18px 16px 20px;
  min-width: 0;
  transition: background-color 0.26s var(--ease);
}

.page-about .evidence__cell:hover {
  background-color: #35291F;
}

.page-about .evidence__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bronze);
  letter-spacing: -0.01em;
}

.page-about .evidence__label {
  display: block;
  margin-top: 8px;
  font-size: 0.875rem;
  color: var(--paper-hi);
}

.page-about .evidence__scene {
  margin: 8px 0 0;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(255, 249, 239, 0.72);
}

/* ---------- Badges ---------- */
.page-about .about-badges {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-badges__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border-left: 3px solid var(--bronze);
  background-color: var(--paper-hi);
  font-size: 0.9375rem;
  color: var(--ink);
}

.page-about .about-badges__no {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--indigo);
  flex: none;
}

/* ---------- Audience ---------- */
.page-about .about-audience {
  display: grid;
  gap: 1px;
  background-color: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-audience__row {
  background-color: var(--paper-hi);
  padding: 16px clamp(14px, 3vw, 20px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 12px;
}

.page-about .about-audience__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ink);
}

.page-about .about-audience__pct {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cinnabar);
}

.page-about .about-audience__track {
  grid-column: 1 / -1;
  display: block;
  height: 4px;
  background-color: rgba(216, 200, 180, 0.75);
}

.page-about .about-audience__bar {
  display: block;
  height: 100%;
  background-color: var(--jade);
}

.page-about .about-audience__note {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 0.875rem;
  color: rgba(42, 33, 28, 0.82);
  max-width: 40em;
}

.page-about .about-audience__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 40em;
  font-size: 0.9375rem;
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  background-color: var(--cinnabar-deep);
  color: var(--paper-hi);
  padding-block: clamp(34px, 5vw, 58px);
  border-top: 4px solid var(--cinnabar);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
}

.page-about .about-cta .eyebrow {
  color: #F3D9A4;
}

.page-about .about-cta h2 {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  line-height: 1.2;
  color: var(--paper-hi);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 36em;
  font-size: 0.9375rem;
  color: rgba(255, 249, 239, 0.9);
}

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

.page-about .about-cta__links .btn {
  text-decoration: none;
}

.page-about .about-cta__links .btn--solid {
  background-color: var(--paper-hi);
  color: var(--cinnabar-deep);
  border-color: var(--paper-hi);
}

.page-about .about-cta__links .btn--ghost {
  color: var(--paper-hi);
  border-color: rgba(255, 249, 239, 0.65);
}

.page-about .about-cta__links .btn--ghost:hover,
.page-about .about-cta__links .btn--ghost:focus-visible {
  background-color: rgba(255, 249, 239, 0.16);
}

.page-about .about-cta__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.8;
  color: rgba(255, 249, 239, 0.78);
}

/* ---------- Wider screens ---------- */
@media (min-width: 640px) {
  .page-about .evidence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-hero__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-right: 20px;
    border-right: 1px solid var(--line);
    align-self: stretch;
  }

  .page-about .about-hero__seal {
    width: 64px;
    height: 136px;
    font-size: 1.4rem;
  }

  .page-about .chapter__grid {
    grid-template-columns: var(--ab-aside) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 68px);
    align-items: start;
  }

  .page-about .chapter__aside {
    position: sticky;
    top: 96px;
    display: block;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding-left: 16px;
  }

  .page-about .chapter--dark .chapter__aside {
    border-left-color: rgba(246, 238, 223, 0.3);
  }

  .page-about .chapter__num {
    display: block;
  }

  .page-about .chapter__year {
    display: block;
    margin-top: 10px;
  }

  .page-about .chapter__kicker {
    display: block;
    margin: 14px 0 0;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: 32px;
  }

  .page-about .about-cta__meta {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(255, 249, 239, 0.28);
    padding-top: 14px;
  }
}

@media (min-width: 1080px) {
  .page-about .evidence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-audience__row {
    grid-template-columns: 12em auto minmax(0, 1fr);
    align-items: center;
    column-gap: 16px;
  }

  .page-about .about-audience__track {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about .about-audience__note {
    grid-column: 1 / -1;
  }

  .page-about .evo__head {
    grid-template-columns: auto 12em minmax(0, 1fr) auto;
    gap: 4px 16px;
  }

  .page-about .evo__sum {
    grid-column: 3;
  }

  .page-about .evo__toggle {
    grid-row: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__index a,
  .page-about .about-principles__item,
  .page-about .evo__head,
  .page-about .evidence__cell,
  .page-about .evo__toggle::before,
  .page-about .evo__toggle::after {
    transition: none;
  }
}
<<<END>>>