.page-about {
  --about-gap: clamp(18px, 2.4vw, 30px);
  background: var(--ink-900);
  color: var(--text-100);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + var(--rail-h) + clamp(28px, 5vw, 56px)) 0 clamp(36px, 6vw, 68px);
  background:
    repeating-linear-gradient(0deg, rgba(69, 240, 208, 0.05) 0 1px, transparent 1px 5px),
    radial-gradient(120% 90% at 88% -10%, rgba(69, 240, 208, 0.16), transparent 62%),
    radial-gradient(90% 80% at 0% 110%, rgba(255, 177, 59, 0.13), transparent 58%),
    var(--ink-900);
  border-bottom: var(--border);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  align-items: center;
  margin-top: 18px;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.18;
  letter-spacing: 0.03em;
  margin: 10px 0 18px;
  color: var(--text-100);
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted-300);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(122px, 1fr));
  gap: 14px;
}

.page-about .about-hero__facts li {
  position: relative;
  border-top: 2px solid var(--line-500);
  padding-top: 12px;
}

.page-about .about-hero__facts li::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 38px;
  height: 2px;
  background: var(--amber-400);
}

.page-about .about-hero__facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--amber-400);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.page-about .about-hero__facts span {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted-300);
}

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

.page-about .about-hero__media {
  margin: 0;
  outline: 2px solid var(--teal-400);
  outline-offset: 6px;
}

.page-about .about-hero__media .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- Body layout ---------- */
.page-about .about-body {
  padding: clamp(34px, 6vw, 74px) 0 clamp(44px, 7vw, 88px);
  background:
    linear-gradient(180deg, rgba(16, 50, 71, 0.55), transparent 240px),
    var(--ink-900);
}

.page-about .about-body__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

/* ---------- TOC ---------- */
.page-about .about-toc__title {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal-400);
  margin: 0 0 10px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-500);
  color: var(--muted-300);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--teal-400);
  border-color: var(--teal-400);
}

.page-about .about-toc__idx {
  font-size: 11px;
  color: var(--amber-400);
  letter-spacing: 0.08em;
}

/* ---------- Sections ---------- */
.page-about .about-main {
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  background: var(--paper-100);
  color: var(--ink-900);
  border: 2px solid var(--line-500);
  padding: clamp(20px, 3.2vw, 38px);
  margin-bottom: 24px;
  box-shadow: 8px 8px 0 rgba(43, 82, 102, 0.5);
  overflow-wrap: break-word;
}

.page-about .about-section:last-child {
  margin-bottom: 0;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber-600);
  margin: 0;
}

.page-about .about-section h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.1vw, 31px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin: 10px 0 16px;
  color: var(--ink-900);
}

.page-about .about-section h3 {
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.45;
  letter-spacing: 0.02em;
  margin: 0 0 6px;
  color: var(--ink-900);
}

.page-about .about-section p {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 14px;
}

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

.page-about .about-section strong {
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-section ul {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-section ul > li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-section ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 7px;
  background: var(--teal-700);
}

.page-about .hl {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink-900);
  border-bottom: 2px solid var(--amber-600);
  padding-bottom: 1px;
}

.page-about .about-note {
  border-left: 4px solid var(--teal-700);
  background: var(--paper-200);
  padding: 12px 16px;
  font-size: 14px !important;
  line-height: 1.75;
  margin: 18px 0 0 !important;
}

/* ---------- Trio ---------- */
.page-about .about-trio {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 4px 0 20px;
}

.page-about .about-trio > div {
  border: 1px solid var(--line-500);
  background: rgba(226, 210, 184, 0.62);
  padding: 14px 15px 16px;
}

.page-about .about-trio__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--teal-700);
  margin-bottom: 8px;
}

.page-about .about-trio p {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

/* ---------- Flow ---------- */
.page-about .flow {
  list-style: none;
  counter-reset: flowstep;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .flow > li {
  counter-increment: flowstep;
  position: relative;
  padding: 12px 14px 12px 52px;
  border: 1px solid var(--line-500);
  background: rgba(226, 210, 184, 0.55);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .flow > li::before {
  content: counter(flowstep, decimal-leading-zero);
  position: absolute;
  left: 13px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--teal-400);
  padding: 1px 6px;
  content: counter(flowstep, decimal-leading-zero);
}

/* ---------- Data strip ---------- */
.page-about .data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: 10px;
  margin: 6px 0 20px;
}

.page-about .data-strip > div {
  background: var(--ink-800);
  border-top: 3px solid var(--amber-400);
  padding: 12px 14px 14px;
}

.page-about .data-strip__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 23px;
  font-weight: 700;
  color: var(--amber-400);
  line-height: 1.15;
}

.page-about .data-strip__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted-300);
}

/* ---------- Timeline ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0 0 24px;
  padding: 0 0 0 24px;
  border-left: 2px solid var(--line-500);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 16px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 13px;
  height: 13px;
  background: var(--teal-400);
  border: 2px solid var(--ink-900);
}

.page-about .timeline__node > summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 3px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--teal-700);
}

.page-about .timeline__node[open] > summary::after {
  content: "–";
}

.page-about .timeline__node > summary:focus-visible {
  outline: 2px solid var(--amber-600);
  outline-offset: 3px;
}

.page-about .timeline__year {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber-600);
}

.page-about .timeline__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .timeline__desc {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  padding-left: 2px;
  border-left: 2px solid var(--teal-700);
  padding: 2px 0 2px 12px;
}

/* ---------- Figures ---------- */
.page-about .about-figure {
  margin: 22px 0;
  border: 2px solid var(--line-500);
}

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

/* ---------- Aside ---------- */
.page-about .about-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  min-width: 0;
}

.page-about .data-card {
  position: relative;
  background: var(--ink-800);
  border: 2px solid var(--line-500);
  border-top: 3px solid var(--teal-400);
  padding: 16px 16px 18px;
}

.page-about .data-card__field {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted-300);
  opacity: 0.72;
  transition: opacity 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .data-card__value {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.8vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber-400);
}

.page-about .data-card__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-100);
}

.page-about .data-card:hover .data-card__field,
.page-about .data-card:focus-within .data-card__field {
  opacity: 1;
  color: var(--teal-400);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  background:
    repeating-linear-gradient(90deg, rgba(69, 240, 208, 0.05) 0 1px, transparent 1px 6px),
    linear-gradient(120deg, rgba(255, 177, 59, 0.12), transparent 60%),
    var(--ink-800);
  border-top: 2px solid var(--line-500);
  padding: clamp(44px, 7vw, 82px) 0 clamp(52px, 8vw, 92px);
  clip-path: polygon(0 0, 100% 2.6%, 100% 100%, 0 100%);
}

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

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin: 10px 0 16px;
  color: var(--text-100);
}

.page-about .about-cta p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted-300);
  margin: 0 0 18px;
  max-width: 62ch;
}

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

.page-about .about-cta__meta {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--teal-400);
}

.page-about .about-cta__links {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-cta__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  border: 2px solid var(--line-500);
  background: var(--ink-900);
  color: var(--text-100);
  font-size: 15px;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--teal-400);
  transform: translateX(4px);
}

.page-about .about-cta__arrow {
  color: var(--amber-400);
  font-size: 15px;
}

/* ---------- Responsive ---------- */
@media (min-width: 700px) {
  .page-about .about-trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }

  .page-about .about-cta__grid {
    grid-template-columns: 1.15fr 1fr;
    align-items: start;
    gap: 54px;
  }
}

@media (min-width: 820px) {
  .page-about .about-layout {
    grid-template-columns: 162px minmax(0, 1fr);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + var(--rail-h) + 18px);
  }

  .page-about .about-toc__list {
    display: grid;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }

  .page-about .about-toc__link {
    border: 0;
    border-left: 2px solid var(--line-500);
    padding: 8px 10px;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: var(--teal-400);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }

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

@media (min-width: 1160px) {
  .page-about .about-layout {
    grid-template-columns: 172px minmax(0, 1fr) 264px;
    gap: 30px;
  }

  .page-about .about-aside {
    grid-column: auto;
    grid-template-columns: minmax(0, 1fr);
    position: sticky;
    top: calc(var(--header-h) + var(--rail-h) + 18px);
  }

  .page-about .about-section {
    box-shadow: 10px 10px 0 rgba(43, 82, 102, 0.5);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-cta__link,
  .page-about .data-card__field {
    transition: none;
  }

  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}