.page-about {
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 16px 0 0;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--stone);
}

.page-about .breadcrumb a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}

.page-about .breadcrumb__sep {
  color: rgba(168, 176, 191, 0.45);
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 26px 0 10px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-hero__main .eyebrow {
  display: inline-block;
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about h1 {
  margin: 18px 0 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(2rem, 8.2vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .ab-h1-mark {
  color: var(--gold);
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.8);
}

.page-about .ab-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-stat {
  background: var(--ink);
  padding: 14px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--stone);
}

.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.92);
  max-width: 100%;
}

.page-about .ab-hero__media .note-v {
  position: absolute;
  top: 14px;
  right: 10px;
  writing-mode: vertical-rl;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.28em;
  color: var(--gold-soft);
  text-shadow: 0 1px 8px rgba(7, 12, 24, 0.9);
}

/* ---------- Layout + rail ---------- */
.page-about .ab-layout {
  padding-top: 34px;
}

.page-about .ab-rail {
  display: none;
}

/* ---------- Sections ---------- */
.page-about .ab-section {
  padding: 38px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .ab-section:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .ab-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 16px;
}

.page-about .coord {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--stone);
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.5rem, 5.2vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-section__lead {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(243, 239, 230, 0.68);
}

.page-about .prose p {
  margin: 0 0 1em;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.8);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- Method tabs ---------- */
.page-about .ab-method {
  display: grid;
  gap: 26px;
  margin-top: 20px;
}

.page-about .tabs {
  min-width: 0;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .tabs__tab {
  appearance: none;
  cursor: pointer;
  padding: 9px 18px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--stone);
  font-family: var(--sans);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .tabs__tab:hover {
  color: var(--gold-soft);
  border-color: var(--gold);
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--char);
}

.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
}

.page-about .tabs__panel {
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .tabs__panel p {
  margin: 0 0 14px;
  max-width: 32em;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.84);
}

.page-about .tabs__panel .ab-tab-fact {
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--gold);
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--gold-soft);
}

.page-about .ab-method__media {
  margin: 0;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 86% 0, 100% 14%, 100% 100%, 0 100%);
}

.page-about .ab-method__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  max-width: 100%;
}

.page-about .ab-rhythm {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-rhythm li {
  background: var(--ink);
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .ab-rhythm b {
  display: block;
  margin-bottom: 4px;
  font-family: var(--sans);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}

/* ---------- Space (light block) ---------- */
.page-about .ab-space {
  padding: 26px 20px 30px;
  background: var(--paper);
  color: var(--ink);
  clip-path: polygon(0 0, calc(100% - 46px) 0, 100% 46px, 100% 100%, 0 100%);
}

.page-about .ab-space .coord {
  color: rgba(14, 27, 51, 0.55);
}

.page-about .ab-space .ab-h2 {
  color: var(--ink);
}

.page-about .ab-space .prose p {
  color: rgba(14, 27, 51, 0.82);
}

.page-about .ab-space__media {
  margin: 0 0 20px;
}

.page-about .ab-space__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  max-width: 100%;
}

.page-about .ab-zones {
  list-style: none;
  margin: 20px 0 22px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-space .tag {
  padding: 4px 12px;
  background: transparent;
  border: 1px solid rgba(14, 27, 51, 0.28);
  color: rgba(14, 27, 51, 0.8);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .ab-fact {
  padding-top: 8px;
  border-top: 2px solid var(--ink);
}

.page-about .ab-fact__num {
  display: block;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .ab-fact__label {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: rgba(14, 27, 51, 0.62);
}

/* ---------- Timeline ---------- */
.page-about .ab-timeline {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 6px 0 18px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--gold) transparent;
  scrollbar-width: thin;
}

.page-about .ab-timeline:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

.page-about .ab-tl {
  position: relative;
  flex: 0 0 80%;
  max-width: 320px;
  scroll-snap-align: start;
  padding: 22px 18px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 36px;
  height: 2px;
  background: var(--gold);
}

.page-about .ab-tl__year {
  display: block;
  font-family: var(--mono);
  font-size: clamp(26px, 7.5vw, 34px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold-soft);
}

.page-about .ab-tl__title {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .ab-tl__text {
  margin: 8px 0 0;
  max-width: 30em;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: rgba(243, 239, 230, 0.72);
}

.page-about .ab-tl.is-current {
  border-color: rgba(210, 80, 60, 0.6);
  background: linear-gradient(160deg, rgba(210, 80, 60, 0.18), var(--ink-2) 62%);
}

.page-about .ab-tl.is-current::before {
  background: var(--cinnabar);
}

.page-about .ab-tl.is-current .ab-tl__year {
  color: var(--cinnabar);
}

/* ---------- Partners ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.page-about .ab-partner {
  padding: 24px 20px 26px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .ab-partner__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(24px, 6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .ab-partner__title {
  margin: 10px 0 0;
  font-size: var(--fs-md);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-partner__text {
  margin: 12px 0 0;
  max-width: 32em;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(243, 239, 230, 0.76);
}

.page-about .ab-partner__link {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--gold);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--gold-soft);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-partner__link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- Co-create ---------- */
.page-about .ab-co-create {
  display: grid;
  gap: 22px;
  margin-top: 20px;
}

.page-about .ab-tiers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}

.page-about .ab-tier {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 12px 14px;
  background: var(--ink);
}

.page-about .ab-tier__name {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-tier__desc {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- CTA ---------- */
.page-about .ab-cta {
  margin: 44px 0 56px;
  padding: 26px 20px 28px;
  background: linear-gradient(120deg, rgba(227, 178, 75, 0.14), transparent 58%), var(--ink-2);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), calc(100% - 40px) 100%, 0 100%);
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.4rem, 5vw, 2.1rem);
  line-height: 1.25;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: rgba(243, 239, 230, 0.78);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  background: var(--gold);
  border: 1px solid var(--gold);
  color: var(--char);
  font-family: var(--sans);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .btn:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
}

.page-about .btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--gold-soft);
}

.page-about .btn--ghost:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--char);
}

.page-about .btn:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
}

.page-about .ab-cta__back {
  margin: 18px 0 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--stone);
}

.page-about .ab-cta__back a {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .ab-cta__back a:hover {
  border-bottom-color: var(--gold);
}

/* ---------- Media queries ---------- */
@media (min-width: 768px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-tl {
    flex: 0 0 300px;
  }

  .page-about .ab-space {
    padding: 34px 32px 36px;
  }

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

  .page-about .ab-partners {
    grid-template-columns: 1.35fr 1fr;
  }

  .page-about .ab-co-create {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px;
  }

  .page-about .ab-cta {
    padding: 34px 32px 36px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 36px 0 12px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.6fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .ab-hero__media img {
    aspect-ratio: 9 / 14;
    max-height: 620px;
  }

  .page-about .ab-method {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    display: grid;
    grid-template-columns: 172px minmax(0, 1fr);
    column-gap: 52px;
    align-items: start;
    padding-top: 44px;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 110px;
    padding-right: 16px;
    border-right: 1px solid var(--line);
  }

  .page-about .ab-rail__title {
    margin: 0 0 10px;
    font-family: var(--mono);
    font-size: var(--fs-xs);
    letter-spacing: 0.2em;
    color: var(--stone);
  }

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

  .page-about .ab-rail__link {
    display: block;
    padding: 6px 0 6px 10px;
    border-left: 1px solid transparent;
    font-family: var(--mono);
    font-size: var(--fs-xs);
    letter-spacing: 0.06em;
    color: rgba(243, 239, 230, 0.58);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease;
  }

  .page-about .ab-rail__link:hover {
    color: var(--gold-soft);
  }

  .page-about .ab-rail__link[aria-current] {
    color: var(--gold);
    border-left-color: var(--gold);
  }

  .page-about .ab-rail__years {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .page-about .ab-rail__years a {
    display: inline-block;
    padding: 2px 6px;
    border: 1px solid var(--line);
    font-family: var(--mono);
    font-size: var(--fs-xs);
    color: var(--stone);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease;
  }

  .page-about .ab-rail__years a:hover {
    color: var(--gold-soft);
    border-color: var(--gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
</main>