.page-about {
  --about-gap: clamp(20px, 4vw, 52px);
  --about-rule: 1px solid var(--line-faint);
  padding-bottom: clamp(48px, 8vw, 120px);
}

.page-about .about-masthead {
  padding-top: clamp(84px, 11vw, 132px);
}

.page-about .about-hero {
  display: grid;
  gap: clamp(20px, 3.6vw, 40px);
  margin-top: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__index {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  border-top: var(--about-rule);
  padding-top: 10px;
}

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

.page-about .about-idx {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  flex: 0 0 auto;
  padding: 6px 14px 6px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  border-right: var(--about-rule);
  margin-right: 14px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-idx:last-child {
  border-right: 0;
  margin-right: 0;
  padding-right: 0;
}

.page-about .about-idx__no {
  color: var(--signal);
}

.page-about .about-idx:hover,
.page-about .about-idx:focus-visible,
.page-about .about-idx[aria-current] {
  color: var(--white);
  outline: none;
}

.page-about .about-idx[aria-current] .about-idx__no {
  color: var(--signal);
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 7.6vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--white);
  margin: 14px 0 0;
}

.page-about .about-h1 em {
  font-style: normal;
  color: var(--grass);
  -webkit-text-stroke: 0;
}

.page-about .about-lead {
  max-width: 62ch;
  margin-top: clamp(18px, 2.6vw, 28px);
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--glass);
  opacity: 0.92;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-hero__note {
  margin-top: clamp(20px, 3vw, 34px);
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 46ch;
}

.page-about .about-chapter {
  border-top: var(--about-rule);
  padding-block: clamp(42px, 7vw, 92px);
}

.page-about .about-head {
  max-width: 44rem;
}

.page-about .about-head__lead {
  margin-top: 14px;
  font-size: var(--step-body);
  line-height: 1.75;
  color: var(--muted);
  max-width: 52ch;
}

.page-about .about-origin {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-origin__text p {
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--glass);
  margin-bottom: 16px;
  max-width: 66ch;
}

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

.page-about .about-scenes {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .about-scene {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-scene__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
  padding-top: 3px;
}

.page-about .about-scene__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--white);
  margin: 0 0 4px;
}

.page-about .about-scene p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0;
}

.page-about .about-versions {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .version {
  display: grid;
  gap: 6px 18px;
  padding: clamp(16px, 2.4vw, 26px) clamp(8px, 1.4vw, 16px);
  border-top: var(--about-rule);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .version:last-child {
  border-bottom: var(--about-rule);
}

.page-about .version:focus-visible {
  outline: 1px solid var(--signal);
  outline-offset: 2px;
}

.page-about .version:hover,
.page-about .version:focus-within {
  background: rgba(31, 138, 91, 0.12);
}

.page-about .version__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--line);
  transition: color var(--dur) var(--ease);
}

.page-about .version:hover .version__num,
.page-about .version:focus-within .version__num {
  color: var(--signal);
}

.page-about .version--current .version__num {
  color: var(--grass);
}

.page-about .version--current:hover .version__num,
.page-about .version--current:focus-within .version__num {
  color: var(--signal);
}

.page-about .version__meta {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0;
  text-transform: uppercase;
}

.page-about .version__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 23px);
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 6px 0 8px;
}

.page-about .version__body p:not(.version__meta) {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
  max-width: 58ch;
}

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

.page-about .about-team {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 52px);
  background: var(--line-faint);
}

.page-about .about-role {
  background: var(--ink-soft);
  padding: clamp(20px, 3vw, 32px);
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  border-left-color: var(--signal);
  background: var(--grass-deep);
}

.page-about .about-role__no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
  margin: 0 0 10px;
}

.page-about .about-role__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 21px);
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-role p:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: var(--glass);
  opacity: 0.86;
  margin: 0;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(24px, 3.4vw, 40px);
  padding: clamp(20px, 3vw, 32px);
  background: rgba(221, 243, 230, 0.06);
  border: var(--about-rule);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  margin: 0;
}

.page-about .about-flow__num small {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-left: 6px;
  font-weight: 400;
}

.page-about .about-flow__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--glass);
  max-width: 44ch;
}

.page-about .figures {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 52px);
  background: var(--line-faint);
}

.page-about .figure {
  background: var(--ink-soft);
  padding: clamp(22px, 3.2vw, 40px);
}

.page-about .figure__num {
  font-family: var(--font-mono);
  font-size: clamp(44px, 8vw, 84px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--white);
  margin: 0;
}

.page-about .figure__num--signal {
  color: var(--signal);
}

.page-about .figure__num small {
  font-size: 0.35em;
  letter-spacing: 0;
  color: var(--muted);
  margin-left: 4px;
}

.page-about .figure__label {
  margin: 12px 0 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--glass);
}

.page-about .figure__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 34ch;
}

.page-about .about-filter {
  margin-top: clamp(26px, 3.6vw, 44px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: var(--about-rule);
}

.page-about .about-filter__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 22px);
  color: var(--white);
  margin: 0 0 16px;
}

.page-about .about-filter__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-filter__list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--glass);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .about-filter__list .mono {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--signal);
  border: 1px solid rgba(255, 106, 26, 0.4);
  padding: 2px 8px;
  border-radius: var(--radius);
}

.page-about .about-filter__note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-region {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(28px, 4vw, 52px);
}

.page-about .about-region__text p {
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--glass);
  margin: 0 0 16px;
  max-width: 62ch;
}

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

.page-about .about-contact {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: var(--about-rule);
}

.page-about .about-contact__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-contact__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-contact__value {
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
  overflow-wrap: anywhere;
}

.page-about .about-jumps {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-jump {
  display: block;
  padding: clamp(20px, 3vw, 32px);
  text-decoration: none;
  color: inherit;
  background: var(--grass-deep);
  border-left: 2px solid var(--grass);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-jump:hover,
.page-about .about-jump:focus-visible {
  background: var(--ink-soft);
  border-left-color: var(--signal);
  outline: none;
}

.page-about .about-jump__no {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
  margin-bottom: 10px;
}

.page-about .about-jump__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 24px);
  color: var(--white);
  margin: 0 0 8px;
}

.page-about .about-jump p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--glass);
  opacity: 0.86;
  margin: 0 0 16px;
  max-width: 40ch;
}

.page-about .about-jump__cta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .media-frame__img img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 640px) {
  .page-about .version {
    grid-template-columns: 88px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .version__num {
    font-size: clamp(38px, 5vw, 54px);
  }

  .page-about .about-contact__row {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero {
    grid-template-columns: 116px minmax(0, 1fr);
    column-gap: clamp(30px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-hero__index {
    flex-direction: column;
    overflow: visible;
    border-top: 0;
    border-left: var(--about-rule);
    padding-top: 0;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-idx {
    border-right: 0;
    border-left: 2px solid transparent;
    margin: 0 0 0 -1px;
    padding: 10px 0 10px 14px;
    width: 100%;
  }

  .page-about .about-idx:last-child {
    padding-right: 0;
    padding-left: 14px;
  }

  .page-about .about-idx[aria-current] {
    border-left-color: var(--signal);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-versions {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-versions__media {
    position: sticky;
    top: 104px;
  }

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

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

  .page-about .figure--raised {
    transform: translateY(-14px);
  }

  .page-about .about-filter__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 32px;
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

@media (min-width: 1120px) {
  .page-about .about-hero {
    grid-template-columns: 132px minmax(0, 1fr);
  }

  .page-about .version {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 6px 28px;
  }

  .page-about .about-role {
    padding: 36px 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-idx,
  .page-about .version,
  .page-about .version__num,
  .page-about .about-role,
  .page-about .about-jump {
    transition: none;
  }

  .page-about .figure--raised {
    transform: none;
  }
}