.page-about {
  --ab-rail: 200px;
  --ab-grid-line: rgba(42, 68, 56, 0.55);
  display: block;
  min-width: 0;
  padding-bottom: 72px;
}

.page-about * {
  box-sizing: border-box;
}

/* ---------- Hero ---------- */

.page-about .ab-hero {
  position: relative;
  margin: 8px 0 48px;
  padding: 22px 16px 20px;
  border: 2px solid var(--edge);
  background:
    repeating-linear-gradient(90deg, var(--ab-grid-line) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, var(--ab-grid-line) 0 1px, transparent 1px 44px),
    linear-gradient(150deg, rgba(198, 245, 60, 0.1), rgba(12, 31, 26, 0) 62%),
    var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .ab-hero__title {
  margin: 14px 0 16px;
  max-width: 15ch;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(36px, 9vw, 88px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 245, 239, 0.86);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 22px 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .ab-fact {
  padding: 13px 12px;
  background: var(--panel-2);
}

.page-about .ab-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .ab-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cool);
}

/* ---------- Image frames ---------- */

.page-about .ab-shot {
  margin: 0;
  overflow: hidden;
  border: 2px solid var(--edge);
  background: var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: linear-gradient(135deg, #16332a, #0c1f1a 70%);
}

.page-about .ab-shot--wide img {
  aspect-ratio: 16 / 7;
}

.page-about .ab-shot--square img {
  aspect-ratio: 1 / 1;
}

.page-about .ab-shot__cap {
  padding: 10px 12px;
  border-top: 2px solid var(--edge);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--cool);
}

/* ---------- Layout + rail ---------- */

.page-about .ab-layout {
  display: grid;
  gap: 36px;
}

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

.page-about .ab-body {
  min-width: 0;
}

/* ---------- Sections ---------- */

.page-about .ab-section {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

.page-about .ab-section + .ab-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px solid var(--edge);
}

.page-about .ab-section__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .ab-section__index {
  flex: 0 0 auto;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--lime);
}

.page-about .ab-section__title {
  margin: 0;
  font-size: clamp(23px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .ab-section__lead {
  margin: 0 0 24px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 245, 239, 0.84);
}

.page-about .ab-note {
  margin: 20px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--amber);
  background: rgba(242, 180, 65, 0.08);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.85);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- Content map cards ---------- */

.page-about .ab-scope-grid {
  display: grid;
  gap: 2px;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .ab-scope-card {
  padding: 18px 16px;
  background: var(--panel);
  transition: background 0.18s ease, box-shadow 0.18s ease;
}

.page-about .ab-scope-card:hover {
  background: var(--panel-2);
  box-shadow: inset 3px 0 0 var(--lime);
}

.page-about .ab-scope-card__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--coral);
}

.page-about .ab-scope-card__title {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-scope-card__text {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.78);
}

.page-about .ab-scope-card__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--edge-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--cool);
}

/* ---------- Team ---------- */

.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-bottom: 26px;
}

.page-about .ab-team__col {
  min-width: 0;
}

.page-about .ab-team .ab-section__lead {
  margin-bottom: 18px;
}

.page-about .ab-dots {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  max-width: 260px;
  margin: 4px 0 10px;
}

.page-about .ab-dot {
  aspect-ratio: 1 / 1;
  background: var(--lime);
  opacity: 0.88;
}

.page-about .ab-dot:nth-child(6n + 4),
.page-about .ab-dot:nth-child(6n + 5) {
  background: var(--coral);
}

.page-about .ab-dots__cap {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cool);
}

.page-about .ab-crews {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--edge);
}

.page-about .ab-crew {
  display: grid;
  gap: 4px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--edge-soft);
}

.page-about .ab-crew__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .ab-crew__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.8);
}

/* ---------- Process steps ---------- */

.page-about .ab-steps {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .ab-step {
  padding: 16px 15px;
  background: var(--panel-2);
  border-top: 3px solid var(--edge-soft);
  transition: border-top-color 0.18s ease, background 0.18s ease;
}

.page-about .ab-step:hover,
.page-about .ab-step:focus-within {
  border-top-color: var(--lime);
  background: var(--panel);
}

.page-about .ab-step__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .ab-step__name {
  margin: 8px 0 6px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-step__text {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 245, 239, 0.78);
}

.page-about .ab-step__out {
  margin: 0;
  padding-top: 9px;
  border-top: 1px dashed var(--edge-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--lime);
}

/* ---------- Timeline ---------- */

.page-about .ab-axis {
  display: grid;
  gap: 2px;
  margin-top: 26px;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .ab-node {
  background: var(--panel);
}

.page-about .ab-node__head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 14px;
  cursor: pointer;
  list-style: none;
  border-top: 3px solid var(--coral);
  transition: background 0.18s ease;
}

.page-about .ab-node__head::-webkit-details-marker {
  display: none;
}

.page-about .ab-node__head:hover {
  background: var(--panel-2);
}

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

.page-about .ab-node__head::after {
  content: "展开 ＋";
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cool);
}

.page-about .ab-node[open] .ab-node__head::after {
  content: "收起 －";
  color: var(--lime);
}

.page-about .ab-node__year {
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--lime);
}

.page-about .ab-node__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-node__body {
  padding: 12px 14px 16px;
  border-top: 1px dashed var(--edge-soft);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.78);
}

.page-about .ab-node__body p {
  margin: 0;
}

/* ---------- Partners + award ---------- */

.page-about .ab-partners {
  display: grid;
  gap: 2px;
  border: 2px solid var(--edge);
  background: var(--edge);
}

.page-about .ab-partners__col {
  padding: 20px 16px;
  background: var(--panel);
}

.page-about .ab-partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-partner-list li {
  position: relative;
  padding: 11px 0 11px 24px;
  border-bottom: 1px dashed var(--edge-soft);
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.84);
}

.page-about .ab-partner-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--coral);
}

.page-about .ab-award {
  padding: 20px 16px;
  background: var(--indigo);
}

.page-about .ab-award__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-award__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.8);
}

.page-about .ab-award .legend {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  border-top: 1px dashed rgba(143, 166, 178, 0.5);
}

/* ---------- Cadence + CTA ---------- */

.page-about .ab-cadence {
  display: grid;
  gap: 12px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
}

.page-about .ab-cadence__item {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  border: 2px solid var(--edge);
  border-left: 4px solid var(--lime);
  background: var(--panel);
}

.page-about .ab-cadence__key {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .ab-cadence__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 245, 239, 0.82);
}

.page-about .ab-cta {
  padding: 22px 16px;
  border: 2px solid var(--lime);
  background:
    linear-gradient(120deg, rgba(198, 245, 60, 0.12), rgba(12, 31, 26, 0) 68%),
    var(--panel-2);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-cta__title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(242, 245, 239, 0.84);
}

.page-about .ab-cta__row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.page-about .ab-cta__note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--cool);
}

.page-about .ab-cta__note a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-cta__note a:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

/* ---------- Breakpoints ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero {
    padding: 30px 28px 26px;
  }

  .page-about .ab-hero__lead {
    font-size: 17px;
  }

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

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

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

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

  .page-about .ab-cadence {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 16px;
  }
}

@media (min-width: 820px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-partners {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .ab-partners__col,
  .page-about .ab-award {
    padding: 24px 22px;
  }
}

@media (min-width: 960px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .ab-hero {
    margin-bottom: 64px;
    padding: 38px 34px 32px;
  }

  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .ab-rail__title {
    margin: 0 0 12px;
    font-family: var(--font-mono);
    font-size: 11.5px;
    letter-spacing: 0.14em;
    color: var(--amber);
  }

  .page-about .ab-rail__list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-left: 2px solid var(--edge);
  }

  .page-about .ab-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-left: -2px;
    padding: 10px 12px;
    border-left: 2px solid transparent;
    font-size: 14px;
    line-height: 1.5;
    color: var(--cool);
    text-decoration: none;
    transition: color 0.18s ease, background 0.18s ease, border-left-color 0.18s ease;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    color: var(--lime);
    background: rgba(198, 245, 60, 0.08);
    border-left-color: var(--lime);
  }

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

  .page-about .ab-rail__num {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--edge-soft);
  }

  .page-about .ab-section + .ab-section {
    margin-top: 72px;
    padding-top: 48px;
  }

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

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 18ch;
  }

  .page-about .ab-partner-list li {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-scope-card,
  .page-about .ab-step,
  .page-about .ab-node__head,
  .page-about .ab-rail__link {
    transition: none;
  }
}
</final>>