.page-about {
  --about-grid: rgba(185, 199, 212, 0.07);
  --rail: 30px;
  --dot: 6px;
  background-color: var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  padding-top: var(--header-h);
  overflow-x: hidden;
}

.page-about .about-shell {
  background-image:
    linear-gradient(to right, var(--about-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: center top;
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb-item,
.page-about .breadcrumb-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-dark-strong);
}

.page-about .breadcrumb-item[aria-current="page"] {
  color: var(--green-soft);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--green);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 36px);
  padding-bottom: clamp(36px, 6vw, 72px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 8vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--white);
}

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

.page-about .about-lead {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--steel-soft);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 1px;
  list-style: none;
  background-color: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background-color: rgba(7, 19, 32, 0.82);
}

.page-about .fact-num {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--green-soft);
}

.page-about .fact-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero-media {
  margin: 0;
}

.page-about .about-hero-media .media-frame {
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--radius);
}

.page-about .about-hero-media .media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ---------- shared section head ---------- */
.page-about .about-section-head {
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-section-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.6vw, 42px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-section-lead {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--steel-soft);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- origin ---------- */
.page-about .about-origin {
  border-top: 1px solid var(--line-dark);
  background: linear-gradient(150deg, rgba(18, 61, 43, 0.55), rgba(12, 26, 43, 0) 68%);
}

.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 48px);
}

.page-about .about-origin-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-origin-body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel-soft);
  max-width: 38em;
}

.page-about .about-inline-link {
  margin-top: 8px;
}

.page-about .about-text-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--green-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 180, 90, 0.45);
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-text-link:hover,
.page-about .about-text-link:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ---------- axis / timeline ---------- */
.page-about .about-axis {
  background-color: var(--ink-950);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .axis-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--rail);
  list-style: none;
}

.page-about .axis-list::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--green) 0%, var(--line-dark-strong) 40%, var(--line-dark) 100%);
}

.page-about .axis-node {
  position: relative;
  padding-bottom: clamp(16px, 2.6vw, 28px);
}

.page-about .axis-node::before {
  content: "";
  position: absolute;
  left: calc(var(--rail) * -1);
  top: 20px;
  width: var(--dot);
  height: var(--dot);
  border-radius: 50%;
  background-color: var(--steel);
}

.page-about .axis-node--current::before {
  background-color: var(--green);
  box-shadow: 0 0 0 2px var(--orange);
}

.page-about .axis-node--figure {
  padding-bottom: clamp(20px, 3vw, 32px);
}

.page-about .axis-node--figure::before {
  background-color: var(--line-dark-strong);
}

.page-about .axis-details {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .axis-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  transition: color 200ms var(--ease);
}

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

.page-about .axis-summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 4px;
}

.page-about .axis-tag {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .axis-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 3vw, 26px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .axis-summary:hover .axis-title {
  color: var(--green-soft);
}

.page-about .axis-hint {
  margin-left: auto;
  font-size: 13px;
  color: var(--steel);
}

.page-about .axis-hint::after {
  content: "＋";
}

.page-about .axis-details[open] .axis-hint::after {
  content: "－";
}

.page-about .axis-details[open] .axis-hint {
  color: var(--green);
}

.page-about .axis-body {
  padding: 4px 0 18px;
  max-width: 62ch;
}

.page-about .axis-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel-soft);
}

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

.page-about .about-contrast .media-frame {
  border: 1px solid var(--line-dark);
}

.page-about .about-contrast .media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ---------- team ---------- */
.page-about .about-team {
  background-color: var(--paper);
  color: var(--text);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-team-copy h2 {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: #3b4a58;
  max-width: 38em;
}

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

.page-about .about-team-media .media-frame {
  border: 1px solid var(--paper-line);
}

.page-about .about-team-media .media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #6c8296;
}

.page-about .about-table-wrap {
  margin-top: clamp(28px, 4vw, 48px);
  overflow-x: auto;
  border-top: 2px solid var(--turf);
}

.page-about .about-fact-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.page-about .about-table-caption {
  padding: 12px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-align: left;
  color: #6c8296;
}

.page-about .about-fact-table th,
.page-about .about-fact-table td {
  padding: 14px 14px 14px 0;
  vertical-align: top;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-fact-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: #6c8296;
  white-space: nowrap;
}

.page-about .about-fact-table tbody th {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.page-about .about-fact-table td {
  color: #3b4a58;
  line-height: 1.7;
}

.page-about .about-fact-table td.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--turf);
  white-space: nowrap;
}

/* ---------- legacy ---------- */
.page-about .about-legacy {
  background-color: var(--ink-950);
  border-top: 1px solid var(--line-dark);
}

.page-about .legacy-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .legacy-old {
  padding: clamp(18px, 3vw, 28px);
  background-color: rgba(108, 134, 160, 0.1);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .legacy-new {
  padding: clamp(18px, 3vw, 28px);
  background-color: rgba(18, 61, 43, 0.55);
  transition: background-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .legacy-old .data-label,
.page-about .legacy-new .data-label {
  display: block;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .legacy-old .data-label {
  color: var(--steel);
}

.page-about .legacy-new .data-label {
  color: var(--green);
}

.page-about .legacy-pages {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background-color: rgba(185, 199, 212, 0.18);
}

.page-about .legacy-page {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  background-color: rgba(12, 26, 43, 0.9);
  transition: background-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .legacy-idx {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .legacy-lines {
  display: block;
  height: 22px;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(185, 199, 212, 0.4) 0,
    rgba(185, 199, 212, 0.4) 1px,
    transparent 1px,
    transparent 6px
  );
}

.page-about .legacy-page:hover,
.page-about .legacy-page:focus-within {
  background-color: rgba(23, 180, 90, 0.16);
}

.page-about .legacy-page:hover .legacy-idx {
  color: var(--green-soft);
}

.page-about .legacy-split:has(.legacy-page:hover) .legacy-new {
  background-color: rgba(23, 180, 90, 0.16);
  box-shadow: inset 0 0 0 1px var(--green);
}

.page-about .legacy-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: legacy-step;
}

.page-about .legacy-step {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(185, 199, 212, 0.16);
}

.page-about .legacy-step:last-child {
  border-bottom: 0;
}

.page-about .legacy-step-no {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .legacy-step-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel-soft);
}

.page-about .legacy-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .legacy-note--new {
  color: var(--green-soft);
}

.page-about .about-legacy-link {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

/* ---------- partners ---------- */
.page-about .about-partners {
  background: linear-gradient(155deg, var(--turf), var(--ink-950) 76%);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
}

.page-about .partner-item {
  padding-top: 16px;
  border-top: 1px solid var(--green);
}

.page-about .partner-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--green-soft);
}

.page-about .partner-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.6vw, 22px);
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .partner-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-soft);
}

/* ---------- credential ---------- */
.page-about .about-credential {
  background-color: var(--ink-950);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-credential-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-credential h2 {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 36px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-credential-text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel-soft);
  max-width: 36em;
}

.page-about .about-credential-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 0;
}

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

.page-about .credential-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .credential-key {
  flex: none;
  min-width: 72px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .credential-val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

/* ---------- media queries ---------- */
@media (min-width: 720px) {
  .page-about .about-br {
    display: inline;
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .legacy-old {
    border-bottom: 0;
    border-right: 1px solid var(--line-dark);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-hero-media {
    margin-top: clamp(20px, 4vw, 56px);
  }

  .page-about .about-origin-grid,
  .page-about .about-team-grid,
  .page-about .about-credential-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-team-media {
    margin-top: clamp(8px, 2vw, 24px);
  }

  .page-about .about-credential-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .legacy-old {
    padding: clamp(24px, 3vw, 36px);
  }

  .page-about .legacy-new {
    padding: clamp(24px, 3vw, 36px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-text-link,
  .page-about .legacy-new,
  .page-about .legacy-page,
  .page-about .axis-summary {
    transition: none;
  }
}