.page-about {
  --ab-card: #FFFDF7;
  --ab-rail: 78px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-cn);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-blue);
  color: var(--paper);
  padding-block: 44px 68px;
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.6) contrast(1.08);
}

.page-about .ab-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 92% at 92% 4%, rgba(0, 168, 107, 0.36), transparent 60%),
    linear-gradient(104deg, var(--ink-blue) 0%, var(--ink-blue) 48%, rgba(11, 31, 58, 0.52) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: radial-gradient(rgba(245, 242, 233, 0.16) 1px, transparent 1px);
  background-size: 14px 14px;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(155deg, transparent 38%, #000 100%);
  mask-image: linear-gradient(155deg, transparent 38%, #000 100%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
}

.page-about .ab-crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(245, 242, 233, 0.62);
}

.page-about .ab-crumbs a {
  color: rgba(245, 242, 233, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--fluoro);
  border-bottom-color: var(--fluoro);
}

.page-about .ab-crumbs__sep {
  color: rgba(245, 242, 233, 0.36);
}

.page-about .ab-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 24px 0 0;
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fluoro);
  border: 1px solid rgba(232, 255, 58, 0.42);
  transform: rotate(-1.5deg);
}

.page-about .ab-hero__dot {
  width: 6px;
  height: 6px;
  background: var(--fluoro);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(232, 255, 58, 0.2);
}

.page-about .ab-hero__title {
  margin: 22px 0 20px;
  max-width: 16em;
  font-size: clamp(30px, 5.4vw, 54px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: rgba(245, 242, 233, 0.86);
}

.page-about .ab-hero__lede--minor {
  color: rgba(245, 242, 233, 0.66);
  font-size: 15px;
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 30px 0 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .ab-hero__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(245, 242, 233, 0.5);
}

.page-about .ab-hero__v {
  font-size: 15px;
  font-weight: 700;
  color: var(--fluoro);
}

/* ---------- Chapter nav ---------- */
.page-about .ab-toc {
  position: sticky;
  top: var(--cmd-h);
  z-index: 20;
  background: var(--paper-2);
  border-bottom: 1px solid var(--line);
  border-top: 3px solid var(--green);
}

.page-about .ab-toc__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-toc__inner::-webkit-scrollbar {
  display: none;
}

.page-about .ab-toc__label {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

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

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  flex: none;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--ink);
  text-decoration: none;
  background: var(--paper);
  border: 1px solid var(--line);
  transition: background var(--t) var(--ease), color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .ab-toc__list a .num {
  font-size: 11px;
  color: var(--slate);
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.page-about .ab-toc__list a:hover .num,
.page-about .ab-toc__list a:focus-visible .num {
  color: rgba(255, 255, 255, 0.8);
}

/* ---------- Section shell ---------- */
.page-about .ab-sec {
  padding-block: clamp(44px, 6.5vw, 92px);
}

.page-about .ab-sec--paper {
  background: var(--paper);
}

.page-about .ab-sec--dark {
  position: relative;
  background: var(--ink-blue);
  color: var(--paper);
}

.page-about .ab-sec--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(245, 242, 233, 0.1) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: 0.5;
}

.page-about .ab-sec--dark > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-sec--indigo {
  position: relative;
  background: var(--indigo);
  color: var(--paper);
  overflow: hidden;
}

.page-about .ab-sec--indigo::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(78% 62% at 12% 0%, rgba(107, 31, 58, 0.55), transparent 68%);
}

.page-about .ab-sec--indigo > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-sec--warm {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-sec--end {
  padding-bottom: clamp(60px, 8vw, 110px);
}

.page-about .ab-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-sec__side {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-sec__num {
  display: inline-block;
  padding: 5px 9px;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0.08em;
  border: 1px solid currentColor;
  border-radius: 2px;
  opacity: 0.82;
}

.page-about .ab-sec__note {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .ab-sec--dark .ab-sec__note,
.page-about .ab-sec--indigo .ab-sec__note {
  color: rgba(245, 242, 233, 0.55);
}

.page-about .ab-sec__title {
  margin: 0 0 18px;
  font-size: clamp(23px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.02em;
}

.page-about .ab-sec--dark .ab-sec__title,
.page-about .ab-sec--indigo .ab-sec__title {
  color: var(--paper);
}

.page-about .ab-sec__main > p {
  max-width: 38em;
  margin: 0 0 15px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-sec--dark .ab-sec__main > p {
  color: rgba(245, 242, 233, 0.82);
}

.page-about .ab-sec__tail {
  max-width: 38em;
  margin: 26px 0 0;
  padding-left: 16px;
  border-left: 3px solid var(--green);
  font-size: 15px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .ab-sec--dark .ab-sec__tail {
  border-left-color: var(--fluoro);
  color: rgba(245, 242, 233, 0.72);
}

/* ---------- Dossier ---------- */
.page-about .ab-dossier {
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-dossier__row {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-dossier__row dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--green-deep);
  font-weight: 700;
}

.page-about .ab-dossier__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- Figure ---------- */
.page-about .ab-figure {
  margin: 28px 0 0;
}

.page-about .ab-figure__frame {
  overflow: hidden;
  border: 1px solid rgba(245, 242, 233, 0.2);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.22);
}

.page-about .ab-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-height: 320px;
  filter: saturate(0.72);
}

.page-about .ab-figure__cap {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.58);
}

/* ---------- Steps ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 16px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  position: relative;
  padding: 22px 20px;
  background: var(--ink-blue-2);
  border: 1px solid rgba(245, 242, 233, 0.14);
  border-left: 3px solid var(--green);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.2);
}

.page-about .ab-step__n {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-blue);
  background: var(--fluoro);
}

.page-about .ab-step__h {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-step__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 242, 233, 0.74);
}

/* ---------- Crew ---------- */
.page-about .ab-crew {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .ab-crew__card {
  padding: 24px 20px;
  background: var(--ab-card);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 var(--paper-2);
}

.page-about .ab-crew__count {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 14px;
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--green-deep);
}

.page-about .ab-crew__unit {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .ab-crew__name {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-crew__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- Timeline ---------- */
.page-about .ab-tl {
  display: grid;
  gap: 34px;
}

.page-about .ab-tl__lede {
  max-width: 30em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 242, 233, 0.72);
}

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

.page-about .ab-tl__frame {
  overflow: hidden;
  border: 1px solid rgba(245, 242, 233, 0.2);
  transform: rotate(-1deg);
}

.page-about .ab-tl__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: grayscale(0.35) contrast(1.05);
}

.page-about .ab-tl__cap {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--wine);
  font-size: 11px;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.55);
}

.page-about .ab-tl__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .ab-tl__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    rgba(245, 242, 233, 0.3) 0 6px,
    transparent 6px 13px
  );
}

.page-about .ab-tl__item {
  position: relative;
  margin-bottom: 18px;
  padding: 18px 18px 18px 20px;
  background: rgba(11, 31, 58, 0.42);
  border: 1px solid rgba(245, 242, 233, 0.14);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--indigo);
  border: 2px solid var(--green-light);
  border-radius: 50%;
}

.page-about .ab-tl__item:hover,
.page-about .ab-tl__item:focus-within {
  transform: translateX(5px);
  border-color: var(--green-light);
  background: rgba(11, 31, 58, 0.66);
}

.page-about .ab-tl__item:last-child {
  margin-bottom: 0;
}

.page-about .ab-tl__ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fluoro);
  border: 1px solid rgba(232, 255, 58, 0.4);
}

.page-about .ab-tl__h {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-tl__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(245, 242, 233, 0.7);
}

/* ---------- Rules ---------- */
.page-about .ab-rules {
  display: grid;
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .ab-rules__item {
  padding: 18px 0 18px 18px;
  border-bottom: 1px solid var(--line-soft);
  border-left: 2px solid transparent;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .ab-rules__item:hover {
  border-left-color: var(--cinnabar);
  background: var(--paper-2);
}

.page-about .ab-rules__h {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-rules__p {
  margin: 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- Service block ---------- */
.page-about .ab-service {
  margin: 26px 0 0;
  padding: 20px 20px 8px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 rgba(217, 79, 43, 0.12);
}

.page-about .ab-service__row {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-service__row:last-child {
  border-bottom: 0;
}

.page-about .ab-service__k {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cinnabar);
  font-weight: 700;
}

.page-about .ab-service__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- Next ---------- */
.page-about .ab-next {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .ab-next__item {
  padding: 22px 20px;
  background: var(--ab-card);
  border: 1px solid var(--line);
  box-shadow: 8px 8px 0 var(--paper-2);
}

.page-about .ab-next__tag {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .ab-next__h {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-next__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- Inline link ---------- */
.page-about .ab-link {
  color: var(--green-deep);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 120, 77, 0.4);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

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

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

/* ---------- Responsive ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding-block: 56px 84px;
  }

  .page-about .ab-figure__frame img {
    max-height: 420px;
  }

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

  .page-about .ab-tl__frame img {
    aspect-ratio: 4 / 3;
  }
}

@media (min-width: 900px) {
  .page-about .ab-sec__grid {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 58px);
  }

  .page-about .ab-sec__side {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--cmd-h) + 64px);
  }

  .page-about .ab-sec__note {
    display: block;
    margin-top: 14px;
    writing-mode: vertical-rl;
    letter-spacing: 0.22em;
    line-height: 1;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
  }

  .page-about .ab-step:nth-child(2) {
    transform: translateY(12px);
  }

  .page-about .ab-step:nth-child(3) {
    transform: translateY(24px);
  }

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

  .page-about .ab-crew__card:nth-child(2) {
    transform: translateY(14px);
  }

  .page-about .ab-crew__card:nth-child(3) {
    transform: translateY(28px);
  }

  .page-about .ab-tl {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-tl__aside {
    position: sticky;
    top: calc(var(--cmd-h) + 48px);
  }

  .page-about .ab-tl__frame img {
    aspect-ratio: 3 / 4;
  }

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

  .page-about .ab-next__item:nth-child(2) {
    transform: translateY(16px);
  }

  .page-about .ab-service__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-dossier__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 18px;
    align-items: baseline;
  }

  .page-about .ab-dossier__row dt {
    padding-top: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .ab-step:nth-child(2),
  .page-about .ab-step:nth-child(3),
  .page-about .ab-crew__card:nth-child(2),
  .page-about .ab-crew__card:nth-child(3),
  .page-about .ab-next__item:nth-child(2),
  .page-about .ab-tl__frame {
    transform: none;
  }
}