.page-about {
  --about-pad: clamp(20px, 4vw, 48px);
  --about-rule: 1px solid var(--ink);
  --about-rule-soft: 1px solid rgba(10, 30, 60, 0.25);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about .container {
  padding-top: 24px;
  padding-bottom: 112px;
}

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

.page-about .breadcrumb {
  margin-bottom: 24px;
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 14px;
}

.page-about .breadcrumb li + li::before {
  content: "／";
  margin-right: 8px;
  color: var(--gray);
}

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

.page-about .breadcrumb a:hover {
  text-decoration: underline;
  text-decoration-color: var(--acid);
}

.page-about .about-hero {
  display: grid;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--ink);
  margin-bottom: var(--space-5);
}

.page-about .about-hero__copy {
  max-width: 54em;
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.page-about .about-hero__index {
  font-family: var(--font-data);
  font-size: 13px;
  border: 1px solid var(--ink);
  padding: 4px 8px;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.page-about .about-hero__sheet {
  font-family: var(--font-comment);
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 0.06em;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(28px, 6vw, 52px);
  line-height: 1.1;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
  max-width: 12em;
}

.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.75;
  max-width: 48em;
  margin: 0;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .about-hero__media {
  margin: 0;
}

.page-about .about-hero__img {
  width: 100%;
  max-width: 420px;
  height: auto;
  aspect-ratio: 600 / 900;
  object-fit: cover;
  border: 1px solid var(--ink);
  background: var(--beige);
}

.page-about .about-hero__media figcaption {
  margin-top: 8px;
  font-family: var(--font-comment);
  font-size: 13px;
  color: var(--gray);
  border-left: 3px solid var(--acid);
  padding-left: 8px;
}

.page-about .about-story,
.page-about .about-team,
.page-about .about-next {
  padding: var(--about-pad) 0;
}

.page-about .about-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 12px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 12px;
  margin-bottom: 28px;
}

.page-about .about-index {
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.2;
  border: 1px solid var(--ink);
  padding: 4px 8px;
  color: var(--ink);
}

.page-about .about-title {
  font-family: var(--font-head);
  font-size: clamp(24px, 4.5vw, 38px);
  line-height: 1.15;
  margin: 0;
}

.page-about .about-section-head .annotate-v {
  margin-left: auto;
  font-family: var(--font-comment);
  font-size: 13px;
  color: var(--gray);
}

.page-about .story-layout {
  display: grid;
  gap: var(--space-4);
}

.page-about .story-copy {
  max-width: 62em;
}

.page-about .story-lead {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.6;
}

.page-about .story-pull {
  margin: 28px 0 0;
  padding: 16px 20px 16px 24px;
  background: var(--beige);
  border-left: 4px solid var(--gold);
  font-family: var(--font-comment);
}

.page-about .story-pull p {
  margin: 0;
  font-size: 16px;
}

.page-about .story-pull footer {
  margin-top: 10px;
  font-size: 13px;
  color: var(--gray);
  text-align: right;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--ink);
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 20px;
}

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

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--acid);
  border: 2px solid var(--ink);
  transition: transform var(--ease-fast), background var(--ease-fast);
}

.page-about .timeline-item:hover::before {
  transform: scale(1.25);
  background: var(--gold);
}

.page-about .timeline-trigger {
  padding: 8px 12px;
  cursor: default;
}

.page-about .timeline-trigger:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 2px;
}

.page-about .timeline-year {
  font-family: var(--font-data);
  font-size: 30px;
  line-height: 1;
  font-weight: 700;
  display: block;
}

.page-about .timeline-title {
  font-family: var(--font-head);
  font-size: 18px;
  margin: 6px 0 0;
}

.page-about .timeline-detail {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--gray);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--ease-slow), opacity var(--ease-fast);
}

.page-about .timeline-trigger:hover .timeline-detail,
.page-about .timeline-trigger:focus .timeline-detail {
  max-height: 180px;
  opacity: 1;
}

.page-about .about-capability {
  background: var(--beige);
  border-left: 6px solid var(--ink);
  border-bottom: 6px solid var(--gold);
  padding: var(--about-pad) var(--space-3);
  margin: var(--space-4) 0 var(--space-5);
}

.page-about .capability-intro {
  max-width: 66em;
}

.page-about .capability-intro p {
  margin: 0;
}

.page-about .capability-band {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .cap-card {
  background: var(--paper);
  border-top: 3px solid var(--ink);
  padding: 20px;
}

.page-about .cap-card:nth-child(2) {
  border-top-color: var(--acid);
}

.page-about .cap-card:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .cap-card__num {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 12px;
}

.page-about .cap-value {
  font-family: var(--font-data);
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .cap-unit {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--gray);
}

.page-about .cap-card__title {
  font-family: var(--font-head);
  font-size: 18px;
  margin: 0 0 8px;
}

.page-about .cap-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .capability-note {
  margin-top: 20px;
}

.page-about .team-layout {
  display: grid;
  gap: var(--space-4);
}

.page-about .team-copy {
  max-width: 54em;
}

.page-about .team-lead {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.6;
}

.page-about .team-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
}

.page-about .team-list li {
  border-left: 3px solid var(--acid);
  padding: 0 0 12px 16px;
  margin-left: 4px;
  font-size: 15px;
  color: var(--gray);
}

.page-about .team-list li:last-child {
  padding-bottom: 0;
}

.page-about .team-list strong {
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 700;
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure__img {
  width: 100%;
  height: auto;
  aspect-ratio: 800 / 600;
  object-fit: cover;
  border: 1px solid var(--ink);
  background: var(--beige);
}

.page-about .team-figure figcaption {
  margin-top: 8px;
  font-family: var(--font-comment);
  font-size: 13px;
  color: var(--gray);
  border-right: 3px solid var(--gold);
  padding-right: 8px;
  text-align: right;
}

.page-about .about-credential {
  background: var(--inkblue);
  color: var(--paper);
  border-top: 4px solid var(--acid);
  border-bottom: 4px solid var(--gold);
  padding: var(--about-pad) var(--space-3);
  margin: var(--space-5) 0;
}

.page-about .about-credential .about-section-head {
  border-bottom-color: var(--gold);
}

.page-about .about-credential .about-index {
  border-color: var(--paper);
  color: var(--acid);
}

.page-about .about-credential .about-title {
  color: var(--paper);
}

.page-about .about-credential .annotate-v {
  color: var(--gold);
}

.page-about .credential-wrap {
  display: grid;
  gap: var(--space-3);
}

.page-about .credential-visual {
  margin: 0;
}

.page-about .credential-visual__img {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  border: 2px dashed var(--acid);
  padding: 4px;
}

.page-about .credential-visual figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: rgba(247, 243, 232, 0.7);
}

.page-about .credential-copy {
  max-width: 62em;
}

.page-about .credential-copy p {
  margin: 0 0 10px;
}

.page-about .credential-copy__sub {
  font-size: 13px;
  color: rgba(247, 243, 232, 0.7);
}

.page-about .credential-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .cred-card {
  display: flex;
  gap: 16px;
  background: rgba(247, 243, 232, 0.06);
  border: 1px solid rgba(247, 243, 232, 0.4);
  padding: 18px;
}

.page-about .cred-badge {
  width: 88px;
  height: 88px;
  flex: 0 0 88px;
  position: relative;
  border-radius: 50%;
  display: grid;
  place-items: center;
  text-align: center;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  background: var(--paper);
  color: var(--ink);
}

.page-about .cred-badge__ring {
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 2px dashed var(--acid);
}

.page-about .cred-badge__ring--gold {
  border-style: solid;
  border-color: var(--gold);
}

.page-about .cred-card__body {
  min-width: 0;
}

.page-about .cred-card__title {
  font-family: var(--font-head);
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .cred-card__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(247, 243, 232, 0.75);
}

.page-about .cred-id {
  margin: 10px 0 0;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--acid);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height var(--ease-slow), opacity var(--ease-fast);
}

.page-about .cred-card:hover .cred-id,
.page-about .cred-card:focus-within .cred-id {
  max-height: 40px;
  opacity: 1;
}

.page-about .about-partners {
  background: var(--mist);
  border-right: 6px solid var(--ink);
  padding: var(--about-pad) var(--space-3);
  margin: var(--space-5) 0;
}

.page-about .partners-intro {
  max-width: 66em;
}

.page-about .partner-list {
  margin-top: 24px;
}

.page-about .partner-item {
  border-bottom: 1px solid var(--ink);
}

.page-about .partner-item summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: 17px;
  padding: 14px 4px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: padding-left var(--ease-fast);
}

.page-about .partner-item summary::-webkit-details-marker {
  display: none;
}

.page-about .partner-item summary::before {
  content: "＋";
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid var(--ink);
  font-family: var(--font-data);
  font-size: 14px;
  line-height: 1;
  background: var(--paper);
  transition: background var(--ease-fast), color var(--ease-fast), transform var(--ease-fast);
}

.page-about .partner-item[open] summary::before {
  content: "－";
  background: var(--acid);
  color: var(--ink);
}

.page-about .partner-item:hover summary {
  padding-left: 10px;
}

.page-about .partner-detail {
  padding: 0 20px 18px 40px;
  max-width: 64em;
}

.page-about .partner-detail p {
  margin: 0;
  font-size: 15px;
  color: var(--gray);
}

.page-about .about-next {
  margin-top: var(--space-5);
}

.page-about .next-grid {
  display: grid;
  gap: 18px;
  margin-top: var(--space-4);
}

.page-about .next-card {
  background: var(--beige);
  padding: 22px;
  border-top: 3px solid var(--ink);
}

.page-about .next-card:nth-child(2) {
  border-top-color: var(--acid);
}

.page-about .next-card:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .next-card .tag {
  display: inline-block;
}

.page-about .next-card__title {
  font-family: var(--font-head);
  font-size: 20px;
  margin: 12px 0 8px;
}

.page-about .next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

.page-about .btn {
  display: inline-block;
  margin-top: 16px;
  text-decoration: none;
}

.page-about .about-close {
  margin-top: var(--space-4);
  border-top: 1px solid var(--ink);
  border-left: 6px solid var(--gold);
  padding: 18px 0 0 16px;
  font-size: 14px;
  color: var(--gray);
  max-width: 52em;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 360px;
    align-items: end;
  }

  .page-about .about-hero__media {
    margin: 0;
  }

  .page-about .story-layout {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.75fr);
    column-gap: var(--space-5);
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 0.8fr);
    column-gap: var(--space-5);
    align-items: center;
  }

  .page-about .capability-band {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .credential-wrap {
    display: grid;
    grid-template-columns: 280px 1fr;
    column-gap: var(--space-4);
    align-items: end;
  }

  .page-about .credential-visual__img {
    max-width: 260px;
  }

  .page-about .credential-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: var(--space-4);
  }

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

@media (hover: none) {
  .page-about .timeline-detail,
  .page-about .cred-id {
    max-height: 180px;
    opacity: 1;
  }
}