.page-about {
  --about-pad: clamp(56px, 8vw, 112px);
  --about-measure: 36ch;
  display: block;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .container {
  padding-left: clamp(18px, 4vw, 40px);
  padding-right: clamp(18px, 4vw, 40px);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  position: relative;
  border-top: 2px solid var(--lime);
  padding: clamp(40px, 6vw, 88px) 0 clamp(36px, 5vw, 72px);
  background:
    radial-gradient(110% 90% at 84% 0%, rgba(63, 224, 192, 0.12), transparent 62%),
    radial-gradient(80% 70% at 4% 100%, rgba(201, 255, 74, 0.06), transparent 60%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(180deg, rgba(233, 247, 240, 0.035) 0 1px, transparent 1px 4px);
  pointer-events: none;
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  color: var(--teal);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 6.2vw, 82px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: var(--about-measure);
  color: var(--muted);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .about-hero__side {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  background: var(--glass);
  backdrop-filter: blur(8px);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .about-fact__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- index ---------- */

.page-about .about-index {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 14px 0;
  display: flex;
  gap: clamp(16px, 3vw, 44px);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--lime);
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--teal);
}

/* ---------- section shell ---------- */

.page-about .about-sec {
  position: relative;
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec--night {
  background:
    radial-gradient(90% 60% at 100% 0%, rgba(63, 224, 192, 0.07), transparent 60%),
    var(--ink-800);
}

.page-about .about-sec--closing {
  background: linear-gradient(180deg, var(--ink-900) 0%, #0C2C27 100%);
}

.page-about .about-sec__head {
  display: grid;
  gap: 0;
  max-width: 26ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .chapter-no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--lime);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(27px, 3.6vw, 50px);
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .about-sec__lede {
  max-width: var(--about-measure);
  margin: 0 0 clamp(30px, 4vw, 52px);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ---------- shared media ---------- */

.page-about .media {
  margin: 0;
}

.page-about .media__frame {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--ink-700);
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .media__caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 01 fans ---------- */

.page-about .about-fans {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-fan {
  padding-top: 18px;
  border-top: 2px solid var(--line);
}

.page-about .about-fan--lead {
  border-top-color: var(--lime);
}

.page-about .about-fan__label {
  margin: 0 0 10px;
  color: var(--teal);
}

.page-about .about-fan__title {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-fan__text {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-fan__meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-fans__figure {
  margin-top: clamp(30px, 4vw, 54px);
}

/* ---------- 02 timeline ---------- */

.page-about .about-timeline__line {
  display: block;
  width: 100%;
  height: clamp(40px, 7vw, 84px);
  opacity: 0.75;
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-version {
  position: relative;
  padding: 18px 18px 18px 56px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(10, 38, 34, 0.62);
  transition: border-color 240ms var(--ease), background 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .about-version::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--lime);
  background: var(--lime);
}

.page-about .about-version.is-current::before {
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(201, 255, 74, 0.18);
}

.page-about .about-version:hover,
.page-about .about-version:focus {
  border-color: var(--lime);
  background: rgba(22, 41, 42, 0.9);
  outline: none;
}

.page-about .about-version:focus-visible {
  box-shadow: 0 0 0 2px var(--teal);
}

.page-about .about-version__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
}

.page-about .about-version__title {
  margin: 6px 0 4px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-version__brief {
  margin: 0;
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .about-version__detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
  transition: max-height 300ms var(--ease), opacity 240ms var(--ease), margin-top 300ms var(--ease);
}

.page-about .about-version:hover .about-version__detail,
.page-about .about-version:focus .about-version__detail,
.page-about .about-version:focus-within .about-version__detail {
  max-height: 160px;
  opacity: 1;
  margin-top: 10px;
}

/* ---------- 03 flow ---------- */

.page-about .about-flow {
  --flow-gap: clamp(18px, 3vw, 40px);
  list-style: none;
  margin: 0 0 clamp(30px, 4vw, 52px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--flow-gap);
}

.page-about .about-flow__step {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .about-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--teal);
}

.page-about .about-flow__title {
  margin: 10px 0 8px;
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow__figure {
  margin-top: 0;
}

/* ---------- 04 teams ---------- */

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team-col {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-team {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--lime);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .about-team__label {
  margin: 0 0 12px;
  color: var(--teal);
}

.page-about .about-team__count {
  margin: 0 0 10px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-team__unit {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team-figure {
  margin: 0;
}

/* ---------- 05 coverage ---------- */

.page-about .about-stats {
  list-style: none;
  margin: 0 0 clamp(26px, 3vw, 40px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
}

.page-about .about-stat {
  padding: 18px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .about-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  color: var(--lime);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-rail {
  margin: 0 0 clamp(24px, 3vw, 38px);
  padding: 16px clamp(16px, 3vw, 24px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-800);
  list-style: none;
}

.page-about .about-rail .rail__item {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--text);
  white-space: nowrap;
}

.page-about .about-coverage__text {
  max-width: var(--about-measure);
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

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

/* ---------- 06 next ---------- */

.page-about .about-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
}

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

.page-about .about-next__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 2px;
  background: var(--lime);
}

.page-about .about-next__col--side {
  padding: 24px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(8px);
}

.page-about .about-next__text {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-next__link {
  color: var(--lime);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid rgba(201, 255, 74, 0.35);
  padding-bottom: 2px;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-bottom-color: var(--lime);
  color: var(--text);
}

/* ---------- closing cta ---------- */

.page-about .about-cta {
  padding: clamp(44px, 6vw, 80px) 0;
  border-top: 1px solid var(--line-soft);
  background: var(--ink-900);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.2;
  color: var(--text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- focus ring ---------- */

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- responsive ---------- */

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-fans {
    grid-template-columns: 5fr 4fr 3fr;
  }

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

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

  .page-about .about-team-grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-next {
    grid-template-columns: 8fr 4fr;
  }

  .page-about .about-cta__inner {
    grid-template-columns: 6fr 6fr;
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-flow__step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 42px;
    right: calc(-1 * var(--flow-gap));
    width: var(--flow-gap);
    height: 2px;
    background: linear-gradient(90deg, rgba(63, 224, 192, 0.15), var(--teal), rgba(63, 224, 192, 0.15));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-version__detail {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (max-width: 420px) {
  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-version {
    padding-left: 48px;
  }

  .page-about .about-version::before {
    left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-version,
  .page-about .about-version__detail,
  .page-about .about-index__link,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .media__img {
    transform: none;
  }
}