.page-about {
  --num-size: clamp(4rem, 18vw, 12.5rem);
  --chapter-space: clamp(4rem, 9vw, 8rem);
  --chapter-gap: clamp(1.5rem, 4vw, 4rem);
  background: var(--c-cream);
  color: var(--c-ink);
}

.page-about .breadcrumb {
  margin-top: 1rem;
}

.page-about .about-hero {
  position: relative;
  padding: 3rem 0 4rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 0%, transparent 62%, rgba(217,164,65,0.08) 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 2rem;
  align-items: stretch;
}

.page-about .about-hero__lead {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2.2rem);
  line-height: 1.35;
  margin: 1.5rem 0 0.75rem;
  color: var(--c-deep-green);
}

.page-about .about-hero__body {
  font-size: 1rem;
  line-height: 1.75;
  opacity: 0.82;
  max-width: 30rem;
}

.page-about .about-hero__anchor {
  margin-top: 1.5rem;
}

.page-about .about-hero__aside {
  background: var(--c-deep-green);
  color: rgba(255, 255, 255, 0.9);
  padding: clamp(1.25rem, 4vw, 2.25rem);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), 0 100%);
}

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

.page-about .hero-facts__item {
  padding: 1.1rem 0;
  border-bottom: 1px solid rgba(217, 164, 65, 0.25);
}

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

.page-about .hero-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .hero-facts__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.875rem;
  opacity: 0.78;
}

.page-about .archive-chapter {
  padding-block: var(--chapter-space);
}

.page-about .archive-chapter__grid {
  display: grid;
  gap: 1.5rem;
}

.page-about .archive-chapter__index {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  border-bottom: 3px solid var(--c-moss);
  padding-bottom: 0.75rem;
  margin-bottom: 0.5rem;
}

.page-about .archive-chapter__num {
  font-family: var(--font-mono);
  font-size: var(--num-size);
  font-weight: 700;
  line-height: 0.85;
  color: var(--c-deep-green);
  -webkit-text-stroke: 2px var(--c-gold);
  -webkit-text-fill-color: rgba(14, 59, 44, 0.08);
}

.page-about .archive-chapter__label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-deep-green);
}

.page-about .archive-chapter__content .section-head {
  margin-bottom: 1.5rem;
}

.page-about .archive-chapter__content h2 {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: 0.02em;
  color: var(--c-ink);
  margin: 0.75rem 0 0.5rem;
  position: relative;
  display: inline-block;
  transition: color 0.3s var(--ease-out);
}

.page-about .archive-chapter__content h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15em;
  height: 4px;
  width: 100%;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}

.page-about .archive-chapter__content h2:hover::after,
.page-about .archive-chapter__content h2:focus-within::after {
  transform: scaleX(1);
}

.page-about .archive-chapter__body p {
  font-size: 1rem;
  line-height: 1.85;
  margin: 0 0 1rem;
  opacity: 0.85;
}

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

.page-about .journey-list {
  list-style: none;
  margin: 2.2rem 0 0;
  padding: 0 0 0 1.5rem;
  border-left: 3px solid var(--c-moss);
}

.page-about .journey-list__item {
  position: relative;
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
}

.page-about .journey-list__item::before {
  content: "";
  position: absolute;
  left: -1.56rem;
  top: 1.15rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 999px;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px var(--c-cream);
}

.page-about .journey-list__year {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-deep-green);
}

.page-about .journey-list__note {
  font-size: 0.9375rem;
  opacity: 0.82;
}

.page-about .archive-figure {
  margin: 2.5rem 0 0;
  background: var(--c-mineral);
  padding: 1rem;
  border-radius: 4px;
}

.page-about .archive-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 2px;
}

.page-about .archive-figure figcaption {
  padding-top: 0.75rem;
  font-size: 0.8125rem;
  opacity: 0.7;
}

.page-about .hills-divider {
  max-width: 100%;
  overflow: hidden;
  line-height: 0;
}

.page-about .hills-divider svg {
  display: block;
  width: 100%;
  height: clamp(3rem, 8vw, 7rem);
}

.page-about .coverage-board {
  background: var(--c-cream);
  border-left: 6px solid var(--c-gold);
  border-top: 1px solid var(--c-moss);
  border-right: 1px solid var(--c-moss);
  border-bottom: 1px solid var(--c-moss);
  padding: 1.5rem 1rem 2rem;
  margin-top: 2rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.25rem), 0 100%);
}

.page-about .coverage-board__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem 1.5rem;
}

.page-about .coverage-board__cell {
  text-align: center;
}

.page-about .coverage-board__cell dt {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-deep-green);
}

.page-about .coverage-board__cell dd {
  margin: 0.4rem 0 0;
  font-size: 0.8125rem;
  opacity: 0.75;
}

.page-about .coverage-cards {
  display: grid;
  gap: 1rem;
  margin: 2rem 0 0;
}

.page-about .coverage-card {
  background: var(--c-deep-green);
  border: 1px solid rgba(217, 164, 65, 0.35);
  border-radius: 4px;
}

.page-about .coverage-card summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  transition: background-color 0.25s var(--ease-out);
}

.page-about .coverage-card summary::-webkit-details-marker {
  display: none;
}

.page-about .coverage-card summary:hover,
.page-about .coverage-card[open] summary {
  background: rgba(217, 164, 65, 0.12);
}

.page-about .coverage-card summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .coverage-card[open] summary::after {
  content: "−";
}

.page-about .coverage-card__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--c-gold);
  white-space: nowrap;
}

.page-about .coverage-card__track {
  flex: 1;
  height: 3px;
  background: rgba(217, 164, 65, 0.25);
}

.page-about .coverage-card__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--c-gold);
  white-space: nowrap;
}

.page-about .coverage-card__detail {
  margin: 0;
  padding: 0.9rem 1.25rem 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  border-top: 1px dashed rgba(217, 164, 65, 0.3);
}

.page-about .coverage-scale {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 2rem 0 0;
}

.page-about .coverage-scale__item {
  background: var(--c-mineral);
  padding: 1rem 0.5rem;
  text-align: center;
}

.page-about .coverage-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-deep-green);
}

.page-about .coverage-scale__label {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.8125rem;
  opacity: 0.75;
}

.page-about .member-tools {
  display: grid;
  gap: 1rem;
  margin: 2rem 0 0;
}

.page-about .member-tool {
  background: var(--c-mineral);
  border-top: 4px solid var(--c-gold);
  padding: 1.5rem 1.25rem;
}

.page-about .member-tool__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  display: block;
  color: var(--c-terracotta);
}

.page-about .member-tool__title {
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0.5rem 0 0.35rem;
  color: var(--c-deep-green);
}

.page-about .member-tool__desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  opacity: 0.78;
  margin: 0;
}

.page-about .member-boundary {
  margin: 2rem 0 0;
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  border-left: 6px solid var(--c-dark-red);
  background: rgba(158, 59, 51, 0.06);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-ink);
}

.page-about .chapter-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.75rem;
}

.page-about .anhui-row {
  display: grid;
  gap: 1.5rem;
  margin: 2rem 0 0;
}

.page-about .anhui-row__figure {
  margin: 0;
}

.page-about .anhui-row__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: 4px;
}

.page-about .anhui-row__figure figcaption {
  padding-top: 0.6rem;
  font-size: 0.8125rem;
  opacity: 0.7;
}

.page-about .anhui-row__text p {
  line-height: 1.8;
  margin: 0 0 1.2rem;
}

.page-about .anhui-points {
  list-style: none;
  margin: 0;
  padding: 0.2rem 0 0.2rem 1.25rem;
  border-left: 3px solid var(--c-gold);
}

.page-about .anhui-points li {
  padding: 0.4rem 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  opacity: 0.85;
}

.page-about .boundary-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.page-about .boundary-col {
  padding: 1.5rem 1.5rem 1.5rem 1.25rem;
  border-radius: 4px;
}

.page-about .boundary-col--provide {
  background: var(--c-mineral);
  border-left: 6px solid var(--c-gold);
}

.page-about .boundary-col--not {
  background: rgba(158, 59, 51, 0.06);
  border-left: 6px solid var(--c-dark-red);
}

.page-about .boundary-col__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.375rem;
  margin: 0 0 0.75rem;
  color: var(--c-deep-green);
}

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

.page-about .boundary-list li {
  position: relative;
  padding: 0.4rem 0 0.4rem 1.4rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  opacity: 0.88;
}

.page-about .boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--c-gold);
}

.page-about .boundary-col--not .boundary-list li::before {
  background: var(--c-dark-red);
}

.page-about .data-assurance {
  margin-top: 2rem;
}

.page-about .data-assurance dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 0;
  padding: 0;
}

.page-about .data-assurance dl div {
  background: var(--c-cream);
  border: 1px solid var(--c-moss);
  border-top: 4px solid var(--c-deep-green);
  padding: 1rem 0.75rem;
  text-align: center;
}

.page-about .data-assurance dt {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 700;
  color: var(--c-deep-green);
}

.page-about .data-assurance dd {
  margin: 0.35rem 0 0;
  font-size: 0.75rem;
  line-height: 1.5;
  opacity: 0.75;
}

.page-about .boundary-alert {
  background: var(--c-dark-red);
  color: #fff;
  border-radius: 4px;
  margin-top: 2rem;
}

.page-about .boundary-alert summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.25s var(--ease-out);
}

.page-about .boundary-alert summary::-webkit-details-marker {
  display: none;
}

.page-about .boundary-alert summary:hover,
.page-about .boundary-alert[open] summary {
  background: rgba(14, 59, 44, 0.25);
}

.page-about .boundary-alert__icon {
  background: var(--c-gold);
  color: var(--c-dark-red);
  border-radius: 999px;
  width: 1.6rem;
  height: 1.6rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .boundary-alert p {
  margin: 0;
  padding: 1rem 1.25rem;
  background: var(--c-deep-green);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .contact-panel {
  background: var(--c-deep-green);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  color: rgba(255, 255, 255, 0.9);
  margin-top: 2rem;
  border-radius: 4px;
}

.page-about .contact-line {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(217, 164, 65, 0.25);
}

.page-about .contact-line__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .contact-line__value {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.page-about .contact-panel__note {
  margin: 1.25rem 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  opacity: 0.78;
}

.page-about .contact-panel .btn {
  margin-top: 1.5rem;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .coverage-card summary,
  .page-about .archive-chapter__content h2,
  .page-about .archive-chapter__content h2::after {
    transition: none;
  }
}

@media (min-width: 48em) {
  .page-about .member-tools {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .boundary-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .coverage-board__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .anhui-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 64em) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr);
    align-items: end;
  }

  .page-about .archive-chapter__grid {
    grid-template-columns: minmax(11rem, 0.8fr) minmax(0, 2fr);
    gap: clamp(2rem, 5vw, 5rem);
  }

  .page-about .archive-chapter__index {
    display: block;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
    position: sticky;
    top: 7rem;
    align-self: start;
  }

  .page-about .archive-chapter__label {
    display: block;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 3px solid var(--c-gold);
    width: fit-content;
  }

  .page-about .archive-chapter__content {
    padding-top: 0.8rem;
  }

  .page-about .chapter-cta {
    flex-wrap: nowrap;
  }
}