.page-about {
  --about-rule: rgba(11, 15, 14, 0.12);
  --about-rule-soft: rgba(11, 15, 14, 0.06);
  background: var(--paper-50);
  color: var(--ink-950);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumbs {
  padding-top: clamp(20px, 4vw, 36px);
}

.page-about .breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.page-about .breadcrumbs-item + .breadcrumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--celadon-300);
}

.page-about .breadcrumbs-link {
  color: var(--slate-500);
  text-decoration: none;
}

.page-about .breadcrumbs-link:hover {
  color: var(--celadon-600);
}

.page-about .breadcrumbs-current {
  color: var(--ink-950);
}

/* ---------- hero split ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

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

.page-about .section-kicker {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--celadon-600);
}

.page-about .hero-title {
  margin: 0 0 24px;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(34px, 7vw, 76px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink-950);
}

.page-about .hero-lead {
  margin: 0 0 32px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--slate-500);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.page-about .hero-actions .btn {
  text-decoration: none;
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .hero-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .index-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.page-about .hero-fact-value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(16px, 2vw, 20px);
  color: var(--ink-950);
}

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

.page-about .hero-visual .media-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--celadon-50);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate-500);
}

/* ---------- story ---------- */
.page-about .page-section {
  padding: clamp(40px, 7vw, 88px) 0;
}

.page-about .story-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .section-title {
  margin: 0 0 24px;
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.28;
  color: var(--ink-950);
}

.page-about .story-body p {
  margin: 0 0 20px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate-500);
}

.page-about .story-body strong {
  color: var(--ink-950);
  font-weight: 500;
}

.page-about .story-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .story-pills .pill {
  border: 1px solid var(--celadon-300);
  background: var(--celadon-50);
  color: var(--pine-900);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .story-aside {
  align-self: start;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--celadon-50);
  border: 1px solid var(--celadon-300);
}

.page-about .aside-index {
  list-style: none;
  margin: 14px 0 24px;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .aside-index a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--about-rule-soft);
  color: var(--ink-950);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .aside-index a:hover {
  color: var(--celadon-600);
  padding-left: 4px;
}

.page-about .aside-note {
  padding-top: 18px;
  border-top: 1px solid var(--celadon-300);
}

.page-about .aside-note p {
  margin: 8px 0 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate-500);
}

.page-about .aside-link {
  display: inline-block;
  color: var(--celadon-600);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid var(--celadon-300);
  padding-bottom: 2px;
}

.page-about .aside-link:hover {
  color: var(--pine-900);
  border-bottom-color: var(--celadon-600);
}

/* ---------- timeline ---------- */
.page-about .about-timeline {
  background: var(--ink-950);
  color: var(--paper-50);
  border-radius: var(--radius-xl);
  margin: 0 clamp(12px, 2vw, 24px);
  padding-left: clamp(20px, 4vw, 56px);
  padding-right: clamp(20px, 4vw, 56px);
}

.page-about .about-timeline .section-kicker {
  color: var(--celadon-300);
}

.page-about .about-timeline .section-title {
  color: var(--paper-50);
}

.page-about .about-timeline .section-intro {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--celadon-300);
}

.page-about .section-head {
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold-500), rgba(200, 164, 93, 0.15));
}

.page-about .timeline-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  position: relative;
}

.page-about .timeline-node {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--celadon-300);
  background: var(--pine-900);
  border: 1px solid rgba(200, 164, 93, 0.45);
  transition: box-shadow 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .timeline-item:hover .timeline-node,
.page-about .timeline-item:focus-within .timeline-node {
  color: var(--gold-500);
  box-shadow: 0 0 0 4px rgba(200, 164, 93, 0.18);
}

.page-about .timeline-item--current .timeline-node {
  color: var(--ink-950);
  background: var(--gold-500);
  border-color: var(--gold-500);
}

.page-about .timeline-card {
  padding: 18px 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(247, 244, 236, 0.04);
  border: 1px solid rgba(247, 244, 236, 0.1);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .timeline-item:hover .timeline-card,
.page-about .timeline-item:focus-within .timeline-card {
  background: rgba(247, 244, 236, 0.08);
  border-color: rgba(200, 164, 93, 0.4);
  transform: translateY(-2px);
}

.page-about .timeline-card .index-label {
  color: var(--celadon-300);
}

.page-about .timeline-title {
  margin: 10px 0 12px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(19px, 2.4vw, 24px);
  color: var(--paper-50);
}

.page-about .timeline-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--celadon-300);
}

.page-about .timeline-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(168, 195, 181, 0.75);
}

.page-about .timeline-card .pill--gold {
  display: inline-block;
  background: var(--gold-500);
  color: var(--ink-950);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .timeline-link {
  display: inline-block;
  margin-top: 4px;
  color: var(--gold-500);
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 164, 93, 0.4);
  padding-bottom: 2px;
}

.page-about .timeline-link:hover {
  color: var(--paper-50);
  border-bottom-color: var(--paper-50);
}

/* ---------- system ---------- */
.page-about .section-head--split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: end;
}

.page-about .section-intro {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-500);
}

.page-about .theme-band--system {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .system-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border-radius: var(--radius-lg);
  min-height: 200px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about .system-tile:hover,
.page-about .system-tile:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.page-about .system-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  opacity: 0.65;
}

.page-about .system-tile h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 21px;
}

.page-about .system-tile p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  flex: 1;
}

.page-about .system-tile .system-link {
  font-size: 13px;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  align-self: flex-start;
  padding-bottom: 2px;
  opacity: 0.85;
}

.page-about .system-tile .system-link:hover {
  opacity: 1;
}

.page-about .system-tile--deep {
  background: var(--pine-900);
  color: var(--paper-50);
}

.page-about .system-tile--deep p {
  color: var(--celadon-300);
}

.page-about .system-tile--mid {
  background: var(--celadon-300);
  color: var(--pine-900);
}

.page-about .system-tile--light {
  background: var(--celadon-50);
  color: var(--ink-950);
  border: 1px solid var(--celadon-300);
}

.page-about .system-tile--light p {
  color: var(--slate-500);
}

.page-about .system-tile--cinnabar {
  background: var(--cinnabar-600);
  color: var(--paper-50);
}

.page-about .system-tile--cinnabar p {
  color: rgba(247, 244, 236, 0.85);
}

.page-about .system-figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .system-figure .media-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--celadon-50);
}

/* ---------- team ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .team-lead {
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-500);
  max-width: 64ch;
}

.page-about .role-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 20px;
}

.page-about .role-pill {
  font-family: var(--font-sans);
  font-size: 13px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--celadon-300);
  background: transparent;
  color: var(--pine-900);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .role-pill:hover {
  border-color: var(--celadon-600);
  color: var(--celadon-600);
}

.page-about .role-pill:focus-visible {
  outline: 2px solid var(--focus-400);
  outline-offset: 2px;
}

.page-about .role-pill.is-active {
  background: var(--celadon-600);
  border-color: var(--celadon-600);
  color: var(--paper-50);
}

.page-about .role-panel {
  display: none;
  padding: 20px 22px;
  border-radius: var(--radius-md);
  background: var(--celadon-50);
  border-left: 3px solid var(--celadon-600);
}

.page-about .role-panel.is-active {
  display: block;
}

.page-about .role-panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate-500);
}

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

.page-about .team-visual .media-frame {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--celadon-50);
}

/* ---------- partners ---------- */
.page-about .about-partners {
  background: var(--celadon-50);
  border-top: 1px solid var(--celadon-300);
  border-bottom: 1px solid var(--celadon-300);
}

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

.page-about .partners-main p {
  margin: 0 0 18px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-500);
}

.page-about .partner-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .partner-links .btn {
  text-decoration: none;
}

.page-about .partner-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--celadon-300);
  border: 1px solid var(--celadon-300);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .partner-stat {
  background: var(--paper-50);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .partner-stat-value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  color: var(--pine-900);
  line-height: 1;
}

.page-about .partner-stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate-500);
}

/* ---------- trust ---------- */
.page-about .trust-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .trust-copy > p {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate-500);
}

.page-about .trust-list {
  margin: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .trust-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-rule-soft);
  align-items: baseline;
}

.page-about .trust-row dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate-500);
}

.page-about .trust-row dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink-950);
  word-break: break-word;
}

.page-about .trust-row dd a {
  color: var(--celadon-600);
  text-decoration: none;
  border-bottom: 1px solid var(--celadon-300);
}

.page-about .trust-row dd a:hover {
  color: var(--pine-900);
}

.page-about .trust-seal {
  display: grid;
  gap: 20px;
}

.page-about .seal-box {
  padding: 32px 26px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gold-500);
  background: var(--ink-950);
  color: var(--paper-50);
  text-align: center;
  position: relative;
}

.page-about .seal-box::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(200, 164, 93, 0.28);
  border-radius: calc(var(--radius-xl) - 8px);
  pointer-events: none;
}

.page-about .seal-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 48px);
  letter-spacing: 0.06em;
  color: var(--gold-500);
}

.page-about .seal-title {
  margin: 8px 0 14px;
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 0.3em;
  color: var(--celadon-300);
}

.page-about .seal-text {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(247, 244, 236, 0.8);
}

.page-about .seal-line {
  display: block;
  width: 48px;
  height: 1px;
  margin: 0 auto 16px;
  background: var(--gold-500);
}

.page-about .seal-foot {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

.page-about .seal-note {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--celadon-50);
  border: 1px solid var(--celadon-300);
}

.page-about .seal-note p {
  margin: 8px 0 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-about .seal-note strong {
  color: var(--ink-950);
  font-weight: 500;
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .theme-band--system {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .partner-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .trust-row {
    grid-template-columns: 120px 1fr;
  }
}

@media (min-width: 960px) {
  .page-about .hero-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 72px);
  }
  .page-about .story-split {
    grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.7fr);
  }
  .page-about .story-aside {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
  .page-about .section-head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }
  .page-about .theme-band--system {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .system-tile {
    grid-column: span 2;
  }
  .page-about .system-tile:nth-child(4) {
    grid-column: span 3;
  }
  .page-about .system-tile:nth-child(5) {
    grid-column: span 3;
  }
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: clamp(36px, 5vw, 72px);
  }
  .page-about .partners-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
  .page-about .trust-split {
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
    gap: clamp(36px, 5vw, 72px);
  }
  .page-about .timeline-item {
    grid-template-columns: 56px 1fr;
    gap: 24px;
  }
  .page-about .timeline-node {
    width: 56px;
    height: 56px;
    font-size: 14px;
  }
  .page-about .timeline::before {
    left: 27px;
  }
  .page-about .timeline-card {
    padding: 24px 28px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-card,
  .page-about .timeline-node,
  .page-about .system-tile,
  .page-about .aside-index a {
    transition: none;
  }
  .page-about .system-tile:hover,
  .page-about .timeline-item:hover .timeline-card {
    transform: none;
  }
}
</