.page-about {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-wrap {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem 1.25rem 5rem;
}

.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 2rem;
}

.page-about .breadcrumb__item a {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb__item a:hover {
  color: var(--accent);
}

.page-about .about-masthead {
  position: relative;
  padding-bottom: 2rem;
  margin-bottom: 2.75rem;
  border-bottom: 4px double var(--ink);
}

.page-about .about-issue {
  display: inline-block;
  background: var(--deep);
  color: var(--paper);
  padding: 0.4rem 0.9rem 0.35rem;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.page-about .about-masthead__title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4.2vw, 3.2rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  max-width: 15em;
}

.page-about .about-masthead__deck {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 44em;
  margin-bottom: 1.75rem;
}

.page-about .about-masthead__img {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  border: 1px solid var(--line);
  filter: sepia(0.15) contrast(1.02);
  box-shadow: 6px 6px 0 var(--paper-dark);
}

.page-about .about-masthead__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin-top: 1.25rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
  margin-top: 2.5rem;
}

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

.page-about .about-toc__label {
  display: block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.85rem;
}

.page-about .about-toc .toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-toc .toc__link {
  display: block;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link.is-active {
  border-left-color: var(--accent);
  background: var(--paper-dark);
  color: var(--accent);
}

.page-about .about-section {
  padding: 2.75rem 0 2rem;
  border-top: 2px solid var(--ink);
  display: grid;
  gap: 1.25rem;
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 1rem;
}

.page-about .about-section__index {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 900;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-section__category {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  flex-basis: 100%;
}

.page-about .about-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.95rem);
  line-height: 1.2;
  margin: 0.8rem 0 1.2rem;
  padding-bottom: 0.55rem;
  border-bottom: 3px double var(--line);
  color: var(--ink);
}

.page-about .about-section__body {
  font-family: var(--font-body);
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-section__body p {
  margin: 0 0 1.1rem;
}

.page-about .about-section__body a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
}

.page-about .about-section__body a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .migration-timeline {
  display: grid;
  gap: 0.85rem;
  margin: 1.75rem 0 1.25rem;
}

.page-about .migration-timeline__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 760px;
  margin-bottom: 0.35rem;
}

.page-about .migration-timeline__node {
  background: var(--paper-dark);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
}

.page-about .migration-timeline__node summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

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

.page-about .migration-timeline__phase {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .migration-timeline__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--ink);
}

.page-about .migration-timeline__node p {
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 40em;
}

.page-about .migration-timeline__node[open] summary {
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .module-ledger {
  margin: 1.75rem 0 1.5rem;
  border-top: 2px solid var(--ink);
}

.page-about .module-ledger__item {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.1rem 0.6rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .module-ledger__no {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 900;
  color: var(--accent);
  padding-top: 0.35rem;
}

.page-about .module-ledger__info h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  margin: 0 0 0.3rem;
  color: var(--ink);
}

.page-about .module-ledger__info p {
  margin: 0 0 0.45rem;
  font-family: var(--font-body);
  font-size: 0.89rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .module-ledger__info a {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
}

.page-about .module-ledger__info a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .about-content__img,
.page-about .principles-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--paper-dark);
  margin: 1.5rem 0;
  box-shadow: 5px 5px 0 var(--paper-dark);
}

.page-about .principles-figure img {
  max-width: 520px;
}

.page-about .about-content__img {
  max-width: 440px;
}

.page-about .principles-list {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .principles-list li {
  display: grid;
  gap: 0.3rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .principles-list__key {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--accent);
}

.page-about .principles-list__value {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .contact-list {
  list-style: none;
  margin: 1.5rem 0 1rem;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.2rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .contact-list__label {
  font-family: var(--font-display);
  font-size: 0.88rem;
  color: var(--muted);
  flex-basis: 7rem;
}

.page-about .contact-list__value {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
}

.page-about .contact-note {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.7;
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

@media (min-width: 760px) {
  .page-about .about-section {
    grid-template-columns: 190px 1fr;
    gap: 0 2.25rem;
  }

  .page-about .about-section__head {
    grid-column: 1;
    border-right: 1px solid var(--line);
    padding-right: 1.5rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-section__category {
    flex-basis: auto;
  }

  .page-about .about-section__title {
    width: 100%;
    margin-bottom: 0;
  }

  .page-about .about-section__body {
    grid-column: 2;
  }
}

@media (min-width: 980px) {
  .page-about .about-wrap {
    padding-left: clamp(3rem, 16vw, 17rem);
    padding-right: clamp(1.5rem, 5vw, 4rem);
  }

  .page-about .about-layout {
    grid-template-columns: minmax(140px, 210px) minmax(0, 760px);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 1.25rem;
    align-self: start;
  }
}