.page-about {
  --ab-card: #1d1d1d;
  --ab-line: #2b2b2b;
  position: relative;
  background: var(--m-space);
  color: var(--m-white);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 12% 0%, rgba(213, 0, 28, 0.16), transparent 46%),
    radial-gradient(ellipse at 88% 18%, rgba(212, 175, 55, 0.1), transparent 42%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.018) 0 2px, transparent 2px 18px);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.ab-wrap {
  width: min(calc(100% - clamp(32px, 5vw, 64px)), var(--m-container));
  margin-inline: auto;
}

.ab-hero {
  padding: clamp(56px, 9vw, 110px) 0 clamp(48px, 6vw, 80px);
  border-bottom: var(--m-border) solid var(--m-red);
  background: linear-gradient(180deg, rgba(213, 0, 28, 0.12), transparent 40%), var(--m-black);
}

.ab-hero .m-crumb {
  margin-bottom: clamp(28px, 5vw, 48px);
}

.ab-hero-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}

.ab-kicker {
  display: inline-flex;
  font-family: var(--m-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 8px 12px;
  border: 1px solid rgba(213, 0, 28, 0.55);
  color: var(--m-gray);
}

.ab-hero-main h1 {
  font-size: clamp(2.2rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 14ch;
  margin: 22px 0 18px;
}

.ab-hero-main .m-lead {
  max-width: 640px;
  color: #c8c8c8;
}

.ab-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.ab-hero-side {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: var(--m-space);
  border: var(--m-border) solid var(--m-red);
  box-shadow: var(--m-shadow);
  padding: 22px;
  min-height: 200px;
  transform: rotate(0.6deg);
}

.ab-hero-side-label {
  font-family: var(--m-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--m-gray);
}

.ab-hero-side-ver {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--m-red);
  margin: 4px 0;
  line-height: 1;
}

.ab-hero-side-note {
  font-size: 0.875rem;
  color: #c8c8c8;
  border-top: 1px solid rgba(212, 175, 55, 0.35);
  padding-top: 12px;
}

.ab-hero-side-link {
  margin-top: 14px;
  font-family: var(--m-font-mono);
  color: var(--m-gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.ab-origin {
  padding: clamp(56px, 7vw, 96px) 0;
  background: radial-gradient(ellipse at 85% 30%, rgba(213, 0, 28, 0.08), transparent 55%), var(--m-space);
}

.ab-sec-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.ab-sec-head .m-sm-num {
  font-family: var(--m-font-mono);
  font-size: 1.3rem;
  color: var(--m-red);
}

.ab-sec-head h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  margin: 0;
}

.ab-sec-head .m-lead {
  max-width: 700px;
  color: var(--m-gray);
  margin-top: 8px;
}

.ab-origin-grid {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
}

.ab-origin-txt {
  color: #d5d5d5;
  line-height: 1.8;
  max-width: 640px;
}

.ab-origin-txt p + p {
  margin-top: 16px;
}

.ab-fact-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.ab-fact-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--m-font-mono);
  border-bottom: 1px solid rgba(156, 163, 175, 0.25);
  padding-bottom: 8px;
}

.ab-fact-list li span {
  color: var(--m-gold);
  font-weight: 700;
  font-size: 1.1rem;
  min-width: 4ch;
}

.ab-shot {
  position: relative;
  border: var(--m-border) solid var(--m-red);
  box-shadow: var(--m-shadow);
  background: #111;
  margin: 0;
}

.ab-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.ab-shot figcaption {
  position: absolute;
  left: -12px;
  bottom: 14px;
  background: var(--m-black);
  border: 1px solid var(--m-gold);
  color: var(--m-white);
  padding: 8px 14px;
  font-family: var(--m-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.ab-timeline {
  padding: clamp(56px, 7vw, 96px) 0;
  background: linear-gradient(180deg, var(--m-black) 0%, var(--m-space) 100%);
  border-top: var(--m-border) solid var(--m-red);
}

.ab-tl-roll {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.ab-tl-path {
  stroke: rgba(213, 0, 28, 0.6);
  stroke-width: 3;
  stroke-dasharray: 6 10;
}

.ab-tl-roll circle {
  fill: var(--m-red);
  stroke: var(--m-gold);
  stroke-width: 2;
}

.ab-timeline-wrap {
  position: relative;
  display: grid;
  gap: 30px;
  padding-left: 26px;
}

.ab-timeline-wrap::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--m-red) 0%, var(--m-gold) 70%, transparent);
}

.ab-milestone {
  position: relative;
  min-width: 0;
}

.ab-ms-dot {
  position: absolute;
  top: 18px;
  left: -25px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--m-red);
  border: 3px solid var(--m-gold);
  box-shadow: 0 0 0 4px rgba(213, 0, 28, 0.2);
}

.ab-ms-frame {
  background: var(--ab-card);
  border: var(--m-border) solid var(--ab-line);
  box-shadow: var(--m-shadow);
  transform: rotate(-0.5deg);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  color: #c8c8c8;
}

.ab-milestone:nth-child(even) .ab-ms-frame {
  transform: rotate(0.6deg);
}

.ab-milestone:hover .ab-ms-frame,
.ab-milestone:focus-within .ab-ms-frame {
  transform: rotate(0deg) translateY(-6px);
  box-shadow: 9px 12px 0 rgba(0, 0, 0, 0.5);
}

.ab-milestone.is-key .ab-ms-frame {
  border-color: var(--m-gold);
  box-shadow: 6px 8px 0 rgba(212, 175, 55, 0.22);
}

.ab-ms-frame summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  cursor: pointer;
  list-style: none;
  padding: 20px 18px;
}

.ab-ms-frame summary::-webkit-details-marker {
  display: none;
}

.ab-ms-frame summary::after {
  content: "+";
  margin-left: auto;
  color: var(--m-gold);
  font-family: var(--m-font-mono);
  font-size: 1.1rem;
}

.ab-ms-frame[open] summary::after {
  content: "-";
}

.ab-ms-no {
  font-family: var(--m-font-mono);
  font-size: 0.8rem;
  color: var(--m-red);
  border: 1px solid rgba(213, 0, 28, 0.4);
  padding: 4px 8px;
}

.ab-ms-title {
  font-family: var(--m-font-head);
  font-weight: 800;
  font-size: clamp(0.98rem, 2vw, 1.24rem);
  color: var(--m-white);
}

.ab-ms-detail {
  padding: 0 18px 20px;
  line-height: 1.75;
}

.ab-ms-detail p {
  margin: 0;
}

.ab-ms-shot {
  margin: 14px 0 6px;
  border: 2px solid rgba(212, 175, 55, 0.35);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.4);
}

.ab-ms-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.ab-legacy {
  padding: clamp(56px, 7vw, 96px) 0;
  background: var(--m-black);
}

.ab-legacy-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr;
}

.ab-legacy-copy {
  max-width: 640px;
}

.ab-legacy-copy .m-sm-num {
  font-family: var(--m-font-mono);
  font-size: 1.3rem;
  color: var(--m-red);
}

.ab-legacy-copy h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  margin: 8px 0 18px;
}

.ab-legacy-copy p {
  color: #c8c8c8;
  line-height: 1.8;
}

.ab-legacy-note {
  margin-top: 24px;
  padding: 18px;
  border-left: 6px solid var(--m-red);
  background: rgba(213, 0, 28, 0.1);
}

.ab-legacy-note p {
  margin: 12px 0 0;
  font-weight: 600;
}

.ab-shot-square {
  margin: 0;
  align-self: center;
}

.ab-legacy-arrow {
  position: absolute;
  left: -8px;
  top: 50%;
  width: 0;
  height: 0;
  border-top: 16px solid transparent;
  border-bottom: 16px solid transparent;
  border-right: 24px solid var(--m-red);
  transform: translateY(-50%);
  filter: drop-shadow(2px 2px 0 rgba(0, 0, 0, 0.4));
  z-index: 1;
}

.ab-values {
  padding: clamp(56px, 7vw, 96px) 0;
  background: var(--m-space);
  border-top: 3px solid var(--m-gold);
}

.ab-values-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: 1fr;
}

.ab-value-card {
  background: var(--m-black);
  border: var(--m-border) solid var(--ab-line);
  box-shadow: var(--m-shadow);
  padding: 26px 24px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.ab-value-card:hover {
  transform: translateY(-4px);
  border-color: var(--m-red);
  box-shadow: 8px 10px 0 rgba(0, 0, 0, 0.5);
}

.ab-value-no {
  font-family: var(--m-font-mono);
  color: var(--m-gold);
  font-weight: 700;
  font-size: 1.4rem;
}

.ab-value-card h3 {
  font-size: 1.4rem;
  margin: 10px 0 12px;
}

.ab-value-card p {
  color: #c8c8c8;
  line-height: 1.75;
}

.ab-value-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.ab-value-chips span {
  font-family: var(--m-font-mono);
  font-size: 0.75rem;
  padding: 6px 10px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  color: var(--m-gold);
}

.ab-values-foot {
  margin-top: clamp(36px, 5vw, 56px);
  padding: 28px 0 0;
  border-top: 1px solid rgba(156, 163, 175, 0.3);
  display: grid;
  gap: 20px;
}

.ab-values-foot p {
  max-width: 700px;
  color: #bdbdbd;
  line-height: 1.8;
}

.ab-values-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

@media (min-width: 820px) {
  .ab-timeline-wrap {
    gap: 56px;
    padding-left: 0;
  }

  .ab-timeline-wrap::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .ab-milestone {
    width: calc(50% - 44px);
  }

  .ab-milestone:nth-child(even) {
    margin-left: auto;
  }

  .ab-ms-dot {
    top: 26px;
    left: auto;
    right: -51px;
  }

  .ab-milestone:nth-child(even) .ab-ms-dot {
    right: auto;
    left: -51px;
  }

  .ab-milestone:nth-child(odd) .ab-ms-frame {
    transform: rotate(-1deg);
  }

  .ab-milestone:nth-child(even) .ab-ms-frame {
    transform: rotate(1.2deg);
  }

  .ab-milestone:hover .ab-ms-frame,
  .ab-milestone:focus-within .ab-ms-frame {
    transform: rotate(0deg) translateY(-6px);
  }
}

@media (min-width: 860px) {
  .ab-origin-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .ab-hero-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: end;
  }

  .ab-hero-side {
    min-height: 260px;
  }

  .ab-legacy {
    background: linear-gradient(115deg, var(--m-black) 0%, var(--m-black) 56%, var(--m-dark-red) 56%, var(--m-dark-red) 100%);
  }

  .ab-legacy-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .ab-values-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}