.page-about .ab-breadcrumb {
  margin-top: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}

.page-about .ab-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  padding-block: clamp(2rem, 5vw, 4.5rem) clamp(2.5rem, 6vw, 5rem);
  position: relative;
}

.page-about .ab-hero__titlebox {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__titlebox::after {
  content: "";
  display: block;
  width: 72px;
  height: 10px;
  margin-top: 1.6rem;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 62%, var(--color-tag) 62%, var(--color-tag) 100%);
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .ab-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin: 0 0 1rem;
}

.page-about .ab-hero__kicker::before {
  content: "";
  width: 2.4rem;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}

.page-about .ab-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
  color: var(--color-ink);
}

.page-about .ab-hero__lead {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.9;
  color: var(--color-ink-soft);
  max-width: 34em;
  margin: 0 0 1.8rem;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about .ab-hero__statbox {
  position: relative;
  background: var(--color-ink);
  color: var(--color-card);
  padding: 1.8rem 1.6rem;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.page-about .ab-hero__stat-label {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-tag);
}

.page-about .ab-hero__stat-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(3rem, 6vw, 4.5rem);
  line-height: 1;
  color: var(--color-card);
}

.page-about .ab-hero__stat-desc {
  font-size: 1rem;
  font-weight: 700;
}

.page-about .ab-hero__stat-meta {
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: rgba(255, 253, 248, 0.7);
  margin-top: 0.4rem;
}

.page-about .ab-hero__stat-line {
  display: block;
  width: 100%;
  height: 1px;
  background: rgba(255, 253, 248, 0.2);
  margin: 0.75rem 0 0.5rem;
}

.page-about .ab-hero__stat-note {
  font-size: 0.85rem;
  color: rgba(255, 253, 248, 0.75);
}

.page-about .ab-hero__fig {
  margin: 0;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

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

.page-about .ab-story {
  position: relative;
}

.page-about .ab-story__head {
  padding-left: 2rem;
  border-left: 4px solid var(--color-accent);
}

.page-about .ab-story__layout {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-story__text p {
  margin: 0 0 1.2rem;
  line-height: 1.9;
  color: var(--color-ink-soft);
  max-width: 45em;
}

.page-about .ab-story__meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 1rem;
  align-items: baseline;
  padding: 1.5rem 1.2rem;
  background: var(--color-card);
  border-left: 6px solid var(--color-accent);
}

.page-about .ab-story__meta-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--color-ink);
}

.page-about .ab-story__meta-label {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
}

.page-about .ab-philosophy__grid {
  display: grid;
  gap: 1.2rem;
}

.page-about .ab-principle {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 1.6rem 1.4rem;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .ab-principle--accent {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-card);
}

.page-about .ab-principle__num {
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.page-about .ab-principle__num::after {
  content: "";
  width: 2.2rem;
  height: 1px;
  background: var(--color-accent);
}

.page-about .ab-principle--accent .ab-principle__num {
  color: var(--color-tag);
}

.page-about .ab-principle__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.25rem;
  margin: 0 0 0.6rem;
}

.page-about .ab-principle p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-about .ab-principle--accent p {
  color: rgba(255, 253, 248, 0.78);
}

.page-about .ab-milestones__layout {
  display: grid;
  gap: 2rem;
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  padding-left: 2.2rem;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 0.6rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent) 0%, var(--color-accent) 16%, var(--color-line) 16%, var(--color-line) 100%);
}

.page-about .ab-timeline__item {
  position: relative;
  margin-bottom: 1.2rem;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  top: 1.1rem;
  left: -2.1rem;
  width: 12px;
  height: 12px;
  background: var(--color-bg);
  border: 3px solid var(--color-accent);
  transform: rotate(45deg);
}

.page-about .ab-timeline__card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 0.25rem 1.2rem 0.75rem;
}

.page-about .ab-timeline__card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.8rem;
  padding: 0.8rem 0;
  margin: 0;
}

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

.page-about .ab-timeline__card summary::after {
  content: "+";
  margin-left: auto;
  order: 3;
  font-family: var(--font-data);
  font-size: 1rem;
  color: var(--color-accent);
  transition: transform 0.25s var(--ease);
}

.page-about .ab-timeline__card[open] summary::after {
  transform: rotate(45deg);
}

.page-about .ab-timeline__ver {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 0.82rem;
  color: var(--color-accent);
  background: rgba(224, 90, 51, 0.1);
  padding: 0.2rem 0.5rem;
}

.page-about .ab-timeline__meta {
  flex: 1;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-ink-soft);
}

.page-about .ab-timeline__title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-ink);
  flex-basis: 100%;
  order: 4;
}

.page-about .ab-timeline__desc {
  padding: 0 0 0.9rem;
  border-top: 1px dashed var(--color-line);
}

.page-about .ab-timeline__desc p {
  margin: 0.8rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-about .ab-milestones__aside {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 1.6rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  align-self: start;
  position: relative;
}

.page-about .ab-milestones__aside::before {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-accent);
  position: relative;
}

.page-about .ab-milestones__aside-note {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--color-ink-soft);
}

.page-about .ab-milestones__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px dashed var(--color-line);
  padding-top: 1.2rem;
}

.page-about .ab-milestones__facts li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--color-line);
}

.page-about .ab-milestones__facts li:last-child {
  border-bottom: none;
}

.page-about .ab-milestones__facts span {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
}

.page-about .ab-milestones__facts strong {
  font-family: var(--font-data);
  font-size: 1.15rem;
  color: var(--color-accent);
}

.page-about .ab-cert__grid {
  display: grid;
  gap: 1.2rem;
  margin-bottom: 1.8rem;
}

.page-about .ab-cert {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.page-about .ab-cert__head {
  margin-bottom: 0.8rem;
}

.page-about .ab-cert__badge {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-card);
  background: var(--color-accent);
  padding: 0.3rem 0.7rem;
  margin-bottom: 0.8rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.page-about .ab-cert__name {
  font-size: 1.05rem;
  font-weight: 900;
  margin: 0;
  line-height: 1.5;
  color: var(--color-ink);
}

.page-about .ab-cert__desc {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--color-ink-soft);
  margin: 0 0 1rem;
}

.page-about .ab-cert__code {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  border-top: 1px dashed var(--color-line);
  padding-top: 0.75rem;
}

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

@media (hover: hover) {
  .page-about .ab-cert__code {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    border-top: none;
    transform: translateY(4px);
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), transform 0.3s var(--ease), border-color 0.3s var(--ease);
  }

  .page-about .ab-cert:hover .ab-cert__code,
  .page-about .ab-cert:focus-within .ab-cert__code {
    max-height: 90px;
    opacity: 1;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--color-line);
    transform: none;
  }
}

.page-about .ab-cert__foot {
  display: grid;
  gap: 1.2rem;
}

.page-about .ab-cert__note {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-ink-soft);
  background: var(--color-card);
  border-left: 6px solid var(--color-tag);
  padding: 1.2rem;
  margin: 0;
}

.page-about .ab-cert__fig {
  margin: 0;
}

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

.page-about .ab-team__layout {
  display: grid;
  gap: 1.8rem;
  align-items: center;
}

.page-about .ab-team__fig {
  margin: 0;
}

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

.page-about .ab-team__roles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
}

.page-about .ab-role {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 1.2rem;
}

.page-about .ab-role__count {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--color-accent);
  margin-bottom: 0.8rem;
}

.page-about .ab-role__name {
  font-size: 0.98rem;
  font-weight: 900;
  margin: 0 0 0.4rem;
  color: var(--color-ink);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-about .ab-ecosystem {
  background: var(--color-footer);
  color: var(--color-card);
  margin-inline: calc(var(--page-pad) * -1);
  padding-inline: var(--page-pad);
  padding-block: clamp(2.5rem, 6vw, 4rem);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .ab-ecosystem .section-desc {
  color: rgba(255, 253, 248, 0.66);
}

.page-about .ab-ecosystem .section-title {
  color: var(--color-card);
}

.page-about .ab-ecosystem .section-index {
  color: var(--color-tag);
}

.page-about .ab-ecosystem__main {
  max-width: 42em;
}

.page-about .ab-ecosystem__main > p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: rgba(255, 253, 248, 0.82);
}

.page-about .ab-ecosystem__list {
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .ab-ecosystem__item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  border-left: 3px solid var(--color-tag);
  padding: 0.6rem 0 0.6rem 0.9rem;
  background: rgba(255, 253, 248, 0.05);
}

.page-about .ab-ecosystem__tag {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--color-tag);
  text-transform: uppercase;
}

.page-about .ab-ecosystem__item span:last-child {
  color: var(--color-card);
  font-size: 0.9rem;
  line-height: 1.6;
}

.page-about .ab-next__inner {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  padding: clamp(1.5rem, 4vw, 3rem);
  position: relative;
}

.page-about .ab-next__inner::before {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  background: var(--color-accent);
  margin-bottom: 1.5rem;
}

.page-about .ab-next__label {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.page-about .ab-next__title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900;
  margin: 0 0 0.75rem;
  color: var(--color-ink);
}

.page-about .ab-next__text {
  color: var(--color-ink-soft);
  max-width: 32em;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: center;
}

.page-about .ab-next__link {
  font-family: var(--font-data);
  font-size: 0.85rem;
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--color-blue);
  padding-bottom: 2px;
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    grid-template-columns: 1.15fr 0.85fr;
    grid-template-areas: "titlebox statbox" "fig fig";
    gap: 2rem;
  }

  .page-about .ab-hero__titlebox {
    grid-area: titlebox;
    align-self: end;
    padding-top: 2rem;
  }

  .page-about .ab-hero__statbox {
    grid-area: statbox;
    align-self: end;
    margin-bottom: 0;
  }

  .page-about .ab-hero__fig {
    grid-area: fig;
  }

  .page-about .ab-story__layout {
    grid-template-columns: 1fr auto;
    gap: 4rem;
    align-items: start;
  }

  .page-about .ab-story__meta {
    min-width: 220px;
    margin-top: 0.5rem;
  }

  .page-about .ab-philosophy__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
  }

  .page-about .ab-principle {
    padding: 2rem 1.6rem;
  }

  .page-about .ab-principle--accent {
    transform: translateY(-0.8rem);
  }

  .page-about .ab-milestones__layout {
    grid-template-columns: 3fr 2fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .ab-cert__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
  }

  .page-about .ab-cert__foot {
    grid-template-columns: 260px 1fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about .ab-team__layout {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .ab-team__roles {
    gap: 1rem;
  }

  .page-about .ab-role {
    padding: 1.5rem;
  }

  .page-about .ab-ecosystem__main {
    max-width: 56em;
  }

  .page-about .ab-ecosystem__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }

  .page-about .ab-ecosystem__item {
    padding: 1rem;
  }
}