.page-about {
  --ab-border: 2px solid var(--ink-green);
  --ab-shadow: 6px 6px 0 var(--ink-green);
  --ab-radius: 0 0 18px 0;
  display: block;
  background: var(--ivory);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 76px);
  background:
    linear-gradient(140deg, rgba(31, 122, 90, 0.12) 0%, rgba(245, 240, 227, 0) 58%),
    var(--ivory);
  overflow: hidden;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(31, 122, 90, 0.055) 0 2px,
    transparent 2px 24px
  );
  pointer-events: none;
  z-index: 0;
}
.page-about .ab-hero__wrap {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__crumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}
.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}
@media (min-width: 940px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }
}
.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 6.4vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink-green);
  margin: 12px 0 20px;
}
.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--cinnabar);
  display: inline-block;
}
.page-about .ab-hero__lead-text {
  max-width: 36em;
  color: var(--ink);
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .ab-hero__panel {
  position: relative;
  padding: clamp(24px, 3.4vw, 34px) clamp(30px, 4vw, 42px) clamp(36px, 5vw, 52px)
    clamp(20px, 3vw, 30px);
  background: linear-gradient(155deg, var(--jade) 0%, var(--deep-jade) 62%, var(--ink-green) 100%);
  color: var(--ivory);
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 92%);
}
.page-about .ab-hero__annotation {
  position: absolute;
  top: clamp(16px, 2.6vw, 26px);
  right: 12px;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--gold);
}
.page-about .ab-hero__panel-title {
  margin: 0 0 clamp(16px, 2.4vw, 22px);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .ab-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(245, 240, 227, 0.28);
}
.page-about .ab-hero__stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}
.page-about .ab-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
  min-width: 2.2ch;
}
.page-about .ab-hero__label {
  font-size: 14px;
  line-height: 1.55;
  color: rgba(245, 240, 227, 0.88);
}

/* ---------- Section shell ---------- */
.page-about .ab-sec {
  position: relative;
  padding: clamp(44px, 6.4vw, 96px) 0;
  border-top: 1px solid var(--mist);
}
.page-about .ab-sec--paper {
  background: var(--paper);
}
.page-about .ab-sec--tiles {
  background: var(--ink-green);
  color: var(--ivory);
  overflow: hidden;
}
.page-about .ab-sec--contact {
  background: var(--ink-green);
  color: var(--ivory);
  border-top: 2px solid var(--gold);
}
.page-about .ab-sec__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.8);
  pointer-events: none;
}
.page-about .ab-sec__wrap {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}
@media (min-width: 900px) {
  .page-about .ab-sec__wrap {
    grid-template-columns: 112px minmax(0, 1fr);
    align-items: start;
    gap: clamp(24px, 3.4vw, 44px);
  }
}
.page-about .ab-sec__aside {
  display: flex;
  align-items: flex-start;
}
@media (min-width: 900px) {
  .page-about .ab-sec__aside {
    position: sticky;
    top: 96px;
  }
}
.page-about .ab-sec__num {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--jade);
  padding-left: 10px;
  border-left: 3px solid var(--cinnabar);
}
.page-about .ab-sec--tiles .ab-sec__num,
.page-about .ab-sec--contact .ab-sec__num {
  color: var(--gold);
}
.page-about .ab-sec__body {
  position: relative;
  min-width: 0;
}
@media (min-width: 900px) {
  .page-about .ab-sec__body {
    padding-right: 34px;
  }
}
.page-about .ab-sec__note {
  display: none;
}
@media (min-width: 900px) {
  .page-about .ab-sec__note {
    display: block;
    position: absolute;
    top: 6px;
    right: 0;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--smoke);
  }
  .page-about .ab-sec--tiles .ab-sec__note,
  .page-about .ab-sec--contact .ab-sec__note {
    color: var(--mist);
  }
}
.page-about .ab-sec__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--ink-green);
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}
.page-about .ab-sec--tiles .ab-sec__title,
.page-about .ab-sec--contact .ab-sec__title {
  color: var(--ivory);
}
.page-about .ab-sec__text {
  max-width: 42em;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .ab-sec--tiles .ab-sec__text,
.page-about .ab-sec--contact .ab-sec__text {
  color: rgba(245, 240, 227, 0.86);
}
.page-about .ab-sec__text .text-link {
  color: var(--cinnabar);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 01 banner + facts ---------- */
.page-about .ab-sec__banner {
  margin: 0 0 clamp(20px, 3vw, 28px);
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  border-radius: var(--ab-radius);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}
.page-about .ab-sec__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  background: var(--ink-green);
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  border-radius: var(--ab-radius);
  overflow: hidden;
}
@media (min-width: 720px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .ab-facts__item {
  padding: 16px clamp(12px, 2vw, 18px);
  background: var(--paper);
}
.page-about .ab-facts dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--jade);
}
.page-about .ab-facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.35;
  color: var(--ink-green);
}

/* ---------- 02 matrix ---------- */
.page-about .ab-matrix {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(22px, 3vw, 30px);
}
@media (min-width: 720px) {
  .page-about .ab-matrix {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-mcard {
  position: relative;
  padding: clamp(18px, 2.6vw, 24px);
  background: var(--ivory);
  color: var(--ink);
  border: 2px solid var(--ink-green);
  box-shadow: 6px 6px 0 var(--ink-green);
  border-radius: 0 0 18px 0;
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}
.page-about .ab-mcard:hover,
.page-about .ab-mcard:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 var(--ink-green);
}
.page-about .ab-mcard:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}
.page-about .ab-mcard__top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}
.page-about .ab-mcard__count {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  font-weight: 500;
  line-height: 1;
  color: var(--cinnabar);
}
.page-about .ab-mcard__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 1.8vw, 1.24rem);
  color: var(--ink-green);
}
.page-about .ab-mcard__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}
.page-about .ab-mcard__extra {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--mist);
  font-size: 14px;
  line-height: 1.7;
  color: var(--smoke);
}
@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-mcard__extra {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease),
      margin-top 0.3s var(--ease), padding-top 0.3s var(--ease),
      border-top-color 0.3s var(--ease);
  }
  .page-about .ab-mcard:hover .ab-mcard__extra,
  .page-about .ab-mcard:focus-within .ab-mcard__extra {
    max-height: 240px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--mist);
  }
}

/* ---------- 03 flow ---------- */
.page-about .ab-flow {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 30px);
}
@media (min-width: 860px) {
  .page-about .ab-flow {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}
.page-about .ab-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-flow__step {
  position: relative;
  margin-left: 14px;
  padding: 0 0 clamp(18px, 2.6vw, 24px) clamp(32px, 4.4vw, 46px);
  border-left: 2px dashed var(--mist);
}
.page-about .ab-flow__step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}
.page-about .ab-flow__idx {
  position: absolute;
  left: -15px;
  top: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  line-height: 1;
  color: var(--ivory);
  background: var(--jade);
  border: 2px solid var(--ink-green);
  border-radius: 4px 4px 10px 4px;
}
.page-about .ab-flow__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.02rem, 1.7vw, 1.16rem);
  color: var(--ink-green);
}
.page-about .ab-flow__step p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}
.page-about .ab-flow__media {
  margin: 0;
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  border-radius: var(--ab-radius);
  overflow: hidden;
}
.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-flow__media .media-frame__cap {
  position: static;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--smoke);
  background: var(--paper);
  border-top: 1px solid var(--mist);
}

/* ---------- 04 ecosystem ---------- */
.page-about .ab-eco {
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
  margin-top: clamp(20px, 3vw, 28px);
}
@media (min-width: 780px) {
  .page-about .ab-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-eco__block {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--ivory);
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  border-radius: var(--ab-radius);
}
.page-about .ab-eco__block--gold {
  background: linear-gradient(150deg, var(--deep-jade), var(--ink-green));
  color: var(--ivory);
}
.page-about .ab-eco__h {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--jade);
}
.page-about .ab-eco__block--gold .ab-eco__h {
  color: var(--gold);
}
.page-about .ab-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-eco__list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  line-height: 1.7;
}
.page-about .ab-eco__n {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 500;
  line-height: 1;
  color: var(--cinnabar);
  min-width: 2ch;
}
.page-about .ab-eco__block--gold .ab-eco__n {
  color: var(--gold);
}
.page-about .ab-eco__list--awards li {
  display: block;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  color: rgba(245, 240, 227, 0.9);
}
.page-about .ab-eco__list--awards strong {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--ivory);
}

/* ---------- 05 timeline tabs ---------- */
.page-about .ab-timeline {
  margin-top: clamp(22px, 3vw, 30px);
  background: var(--paper);
  border: var(--ab-border);
  box-shadow: var(--ab-shadow);
  border-radius: var(--ab-radius);
  overflow: hidden;
}
.page-about .ab-timeline__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 0;
  background: var(--ink-green);
}
.page-about .ab-timeline__tab {
  flex: 1 1 auto;
  min-width: 76px;
  padding: 12px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(245, 240, 227, 0.68);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.page-about .ab-timeline__tab:hover {
  color: var(--ivory);
  background: rgba(245, 240, 227, 0.08);
}
.page-about .ab-timeline__tab[aria-selected="true"] {
  color: var(--ink-green);
  background: var(--paper);
  border-bottom-color: var(--cinnabar);
}
.page-about .ab-timeline__tab:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -4px;
}
.page-about .ab-timeline__panel {
  padding: clamp(20px, 3vw, 30px);
}
.page-about .ab-timeline__tag {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 2px;
}
.page-about .ab-timeline__text {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 06 join ---------- */
.page-about .ab-join {
  display: grid;
  gap: clamp(18px, 2.6vw, 24px);
  margin-top: clamp(20px, 3vw, 28px);
}
@media (min-width: 720px) {
  .page-about .ab-join {
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }
}
.page-about .ab-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .ab-join__collect {
  max-width: 340px;
}
.page-about .ab-join__hint {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .ab-join__list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid rgba(245, 240, 227, 0.18);
}
.page-about .ab-join__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 240, 227, 0.86);
}
.page-about .ab-join__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--gold);
  transform: rotate(45deg);
}
.page-about .ab-join__list strong {
  color: var(--ivory);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-mcard,
  .page-about .ab-mcard__extra,
  .page-about .ab-timeline__tab {
    transition: none;
  }
  .page-about .ab-mcard:hover,
  .page-about .ab-mcard:focus-within {
    transform: none;
  }
}