.page-about {
  position: relative;
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(3rem, 8vw, 7rem) 0 clamp(2.5rem, 6vw, 5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -18% -12% 0;
  z-index: -1;
  background:
    radial-gradient(58% 46% at 80% 10%, rgba(154, 107, 255, 0.22), transparent 70%),
    radial-gradient(54% 42% at 8% 32%, rgba(59, 240, 208, 0.14), transparent 72%);
  pointer-events: none;
}

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

.page-about .ab-hero__title {
  margin: 1rem 0 0;
  max-width: 16em;
  font-size: clamp(2.25rem, 7vw, 5.25rem);
  line-height: 1.04;
  letter-spacing: 0.03em;
  font-weight: 700;
  color: var(--xk-white);
}

.page-about .ab-hero__accent {
  background: linear-gradient(102deg, var(--xk-cyan) 4%, var(--xk-violet) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .ab-hero__lead {
  margin: clamp(1.35rem, 2.6vw, 2rem) 0 0;
  max-width: 40rem;
  font-size: clamp(1rem, 1.15vw, 1.125rem);
  line-height: 1.85;
  color: var(--xk-gray);
}

.page-about .ab-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.75rem;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-left: 1rem;
  border-left: 1px solid var(--xk-line-soft);
}

.page-about .ab-fact__num {
  font-family: var(--xk-font-mono);
  font-size: clamp(1.65rem, 3.4vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--xk-cyan);
}

.page-about .ab-fact__label {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--xk-gray);
}

/* ---------- Banner image ---------- */
.page-about .ab-banner {
  margin: clamp(1rem, 3vw, 2rem) auto 0;
  padding: 0 var(--xk-gutter);
  max-width: var(--xk-maxw);
  box-sizing: border-box;
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--xk-radius-l);
  border: 1px solid var(--xk-line);
}

.page-about .ab-banner__cap {
  margin-top: 0.9rem;
  font-size: 0.8125rem;
  letter-spacing: 0.07em;
  color: var(--xk-gray);
}

/* ---------- Timeline ---------- */
.page-about .ab-timeline-sec {
  padding-top: clamp(3rem, 7vw, 5.5rem);
}

.page-about .ab-timeline {
  display: grid;
  gap: clamp(2rem, 4vw, 3.25rem);
  margin-top: clamp(2.25rem, 4.5vw, 3.5rem);
}

.page-about .ab-era {
  display: grid;
  gap: 0.85rem 1.5rem;
}

.page-about .ab-era__scale {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.page-about .ab-era__year {
  font-family: var(--xk-font-mono);
  font-size: clamp(2.25rem, 5.6vw, 3.5rem);
  line-height: 0.95;
  letter-spacing: 0.01em;
  color: var(--xk-cyan);
}

.page-about .ab-era__season {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--xk-gray);
}

.page-about .ab-era__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.28;
  color: var(--xk-white);
}

.page-about .ab-era__text {
  margin: 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--xk-gray);
}

.page-about .ab-era__chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.1rem 0 0;
  padding: 0;
}

@media (min-width: 760px) {
  .page-about .ab-era {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 0 clamp(1.5rem, 3.5vw, 3rem);
  }

  .page-about .ab-era__scale {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding-top: 0.25rem;
  }

  .page-about .ab-era__body {
    position: relative;
    padding-left: clamp(1.5rem, 3vw, 2.5rem);
  }

  .page-about .ab-era__body::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7rem;
    bottom: calc(-1 * clamp(2rem, 4vw, 3.25rem));
    border-left: 1px dashed rgba(59, 240, 208, 0.26);
  }

  .page-about .ab-era:last-child .ab-era__body::before {
    bottom: auto;
    height: 2.5rem;
  }

  .page-about .ab-era__body::after {
    content: "";
    position: absolute;
    left: -4.5px;
    top: 0.5rem;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--xk-ink);
    border: 2px solid var(--xk-cyan);
  }
}

/* ---------- Team ---------- */
.page-about .ab-team {
  padding-top: clamp(3.5rem, 8vw, 6rem);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.25rem);
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .ab-team__text {
  margin: 0 0 1.15rem;
  max-width: 38rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--xk-gray);
}

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

.page-about .ab-roles {
  list-style: none;
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.page-about .ab-role {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: clamp(1.15rem, 2.4vw, 1.6rem);
  border: 1px solid var(--xk-line);
  border-radius: var(--xk-radius-m);
  background: linear-gradient(160deg, var(--xk-night) 0%, rgba(12, 18, 48, 0.35) 100%);
}

.page-about .ab-role__num {
  font-family: var(--xk-font-mono);
  font-size: clamp(1.9rem, 4vw, 2.65rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--xk-cyan);
}

.page-about .ab-role__name {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--xk-white);
}

.page-about .ab-role__desc {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--xk-gray);
}

@media (min-width: 560px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- Flow ---------- */
.page-about .ab-flow {
  padding-top: clamp(3.5rem, 8vw, 6rem);
}

.page-about .ab-flow__grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.25rem);
}

.page-about .ab-steps {
  list-style: none;
  display: grid;
  gap: 1.6rem;
  margin: clamp(2rem, 4vw, 2.75rem) 0 0;
  padding: 0;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem 1.25rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px dashed rgba(27, 38, 87, 0.9);
}

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

.page-about .ab-step__idx {
  display: inline-block;
  font-family: var(--xk-font-mono);
  font-size: 0.9375rem;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: var(--xk-cyan);
  border: 1px solid rgba(59, 240, 208, 0.42);
  border-radius: var(--xk-pill);
  padding: 0.2rem 0.7rem;
  height: fit-content;
}

.page-about .ab-step__title {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--xk-white);
}

.page-about .ab-step__text {
  margin: 0;
  max-width: 36rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--xk-gray);
}

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

.page-about .ab-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--xk-radius-l);
  border: 1px solid var(--xk-line);
}

@media (min-width: 900px) {
  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

/* ---------- Ecosystem band ---------- */
.page-about .ab-eco {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: clamp(3rem, 7vw, 6rem) 0;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--xk-line);
  border-bottom: 1px solid var(--xk-line);
}

.page-about .ab-eco__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-about .ab-eco::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(6, 10, 28, 0.88) 0%, rgba(6, 10, 28, 0.68) 48%, rgba(6, 10, 28, 0.94) 100%);
}

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

.page-about .ab-eco__lead {
  margin: 1rem 0 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--xk-gray);
}

.page-about .ab-eco__band {
  display: flex;
  gap: 1rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-bottom: 0.85rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .ab-eco__card {
  flex: 0 0 min(86vw, 320px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  border: 1px solid var(--xk-line);
  border-radius: var(--xk-radius-m);
  background: rgba(12, 18, 48, 0.82);
  transition: border-color 0.32s var(--xk-ease), transform 0.32s var(--xk-ease);
}

.page-about .ab-eco__card:hover {
  border-color: rgba(59, 240, 208, 0.55);
  transform: translateY(-3px);
}

.page-about .ab-eco__num {
  font-family: var(--xk-font-mono);
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--xk-cyan);
}

.page-about .ab-eco__role {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--xk-white);
}

.page-about .ab-eco__detail {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--xk-gray);
}

.page-about .ab-eco__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.4rem 0 0;
  padding: 0;
  opacity: 0.72;
  transition: opacity 0.32s var(--xk-ease);
}

.page-about .ab-eco__card:hover .ab-eco__tags {
  opacity: 1;
}

/* ---------- Promise ---------- */
.page-about .ab-promise__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(2rem, 4vw, 3rem);
}

.page-about .ab-promise__card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about .ab-promise__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.5rem;
  margin-top: clamp(1.75rem, 3vw, 2.5rem);
  padding: clamp(1.1rem, 2.2vw, 1.5rem) clamp(1.25rem, 2.6vw, 1.85rem);
  border: 1px solid var(--xk-line);
  border-radius: var(--xk-radius-l);
  background: linear-gradient(120deg, var(--xk-night) 0%, rgba(6, 10, 28, 0.55) 100%);
}

.page-about .ab-promise__label {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--xk-gray);
}

.page-about .ab-promise__mail {
  font-family: var(--xk-font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  color: var(--xk-cyan);
  word-break: break-all;
}

@media (min-width: 720px) {
  .page-about .ab-promise__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- Versions ---------- */
.page-about .ab-versions {
  padding-top: clamp(3rem, 7vw, 5rem);
}

.page-about .ab-vlist {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--xk-line);
}

.page-about .ab-vrow {
  display: grid;
  gap: 0.55rem 1.5rem;
  padding: clamp(1.25rem, 2.6vw, 1.8rem) 0;
  border-bottom: 1px solid var(--xk-line);
}

.page-about .ab-vrow__tag {
  font-family: var(--xk-font-mono);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--xk-violet);
}

.page-about .ab-vrow__title {
  margin: 0 0 0.45rem;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--xk-white);
}

.page-about .ab-vrow__text {
  margin: 0;
  max-width: 42rem;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: var(--xk-gray);
}

@media (min-width: 720px) {
  .page-about .ab-vrow {
    grid-template-columns: 92px minmax(0, 1fr);
    align-items: baseline;
  }
}

/* ---------- CTA ---------- */
.page-about .ab-cta {
  padding: clamp(3rem, 7vw, 5rem) 0 clamp(3.5rem, 8vw, 6rem);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 1rem;
  padding: clamp(1.75rem, 4vw, 3rem);
  border: 1px solid var(--xk-line);
  border-radius: var(--xk-radius-l);
  background:
    radial-gradient(72% 130% at 88% 0%, rgba(154, 107, 255, 0.2), transparent 68%),
    linear-gradient(150deg, var(--xk-night) 0%, rgba(6, 10, 28, 0.6) 100%);
}

.page-about .ab-cta__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.2vw, 2.25rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--xk-white);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--xk-gray);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-eco__card,
  .page-about .ab-eco__tags {
    transition: none;
  }

  .page-about .ab-eco__card:hover {
    transform: none;
  }
}