.page-about {
  --about-text: #cbd9e6;
  --about-rail: 232px;
  background: var(--c-night);
  color: var(--c-white);
  font-family: var(--font-body);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

.page-about .media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--r-lg);
}

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

.page-about .media__caption {
  display: block;
  padding: 10px 2px 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 3vw, 34px) 0 clamp(36px, 5.5vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 78%;
  background:
    radial-gradient(58% 78% at 80% 18%, rgba(77, 225, 255, 0.13), transparent 70%),
    radial-gradient(52% 72% at 6% 0%, rgba(182, 255, 59, 0.11), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7.2vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-hero__media {
  margin: 0;
  background: linear-gradient(160deg, rgba(18, 49, 79, 0.9), rgba(6, 17, 31, 0.9));
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--c-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.page-about .about-hero__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  line-height: 1;
  color: var(--c-lime);
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

/* ---------- .page-about / toc ---------- */
.page-about .about-body {
  padding: clamp(22px, 3.5vw, 38px) 0 clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, rgba(11, 27, 46, 0) 0%, rgba(11, 27, 46, 0.55) 22%, rgba(11, 27, 46, 0.55) 100%);
}

.page-about .about-body__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .about-toc__item {
  scroll-snap-align: start;
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 13px;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc__link:hover {
  color: var(--c-lime);
  border-color: var(--c-lime);
  background: rgba(182, 255, 59, 0.07);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-orange);
}

/* ---------- chapters ---------- */
.page-about .about-ch {
  padding: clamp(26px, 4vw, 46px) 0;
  border-top: 1px solid var(--c-line);
  scroll-margin-top: 96px;
}

.page-about .about-ch:first-child {
  border-top: 0;
  padding-top: clamp(6px, 1.2vw, 14px);
}

.page-about .about-ch__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-lime);
}

.page-about .about-ch__title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .about-ch__sub {
  margin: 28px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.2;
  color: var(--c-white);
}

.page-about .about-ch p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--about-text);
}

.page-about .about-ch strong {
  color: var(--c-white);
  font-weight: 600;
}

.page-about .about-inline-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(77, 225, 255, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--c-lime);
  border-color: var(--c-lime);
}

/* points */
.page-about .about-ch__points {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .about-ch__points li {
  padding: 12px 0 12px 16px;
  border-left: 2px solid var(--c-line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-ch__points li:hover {
  border-left-color: var(--c-orange);
}

/* media in chapter */
.page-about .about-ch__media {
  margin: 24px 0 4px;
}

/* flow */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 20px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-flow__item {
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--c-line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-flow__item:hover {
  border-left-color: var(--c-lime);
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-orange);
}

.page-about .about-flow__name {
  display: block;
  margin: 6px 0 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-white);
}

.page-about .about-flow__desc {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-muted);
}

/* ---------- timeline ---------- */
.page-about .about-tl {
  list-style: none;
  margin: 22px 0 0;
  padding: 8px 0 18px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .about-tl__item {
  position: relative;
  flex: 0 0 min(240px, 76%);
  scroll-snap-align: start;
  padding-top: 24px;
  border-top: 2px solid var(--c-line);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  top: -7px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-night);
  border: 2px solid var(--c-line);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before {
  border-color: var(--c-lime);
  background: var(--c-lime);
}

.page-about .about-tl__item--now::before {
  border-color: var(--c-orange);
  background: var(--c-orange);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--c-white);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 10px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-lime);
}

.page-about .about-tl__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-text);
}

.page-about .about-tl__note {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-cyan);
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin var(--dur) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__note,
.page-about .about-tl__item:focus-within .about-tl__note {
  margin: 8px 0 0;
  max-height: 220px;
  opacity: 1;
}

/* split */
.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-top: 26px;
}

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

/* ---------- stats ---------- */
.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: 24px 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  overflow: hidden;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-stats__cell {
  background: var(--c-night);
  padding: 18px 16px;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 28px);
  line-height: 1.1;
  color: var(--c-lime);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-muted);
}

/* views */
.page-about .about-views {
  list-style: none;
  margin: 6px 0 20px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-views li {
  padding-top: 12px;
  border-top: 2px solid var(--c-panel);
}

.page-about .about-views strong {
  display: block;
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--c-white);
}

.page-about .about-views span {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- operations ---------- */
.page-about .about-ops {
  margin: 22px 0 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-ops__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-ops__label {
  flex: 0 0 58px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-ops__value {
  flex: 1 1 170px;
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-white);
  word-break: break-word;
}

.page-about .about-ops__note {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- partner ---------- */
.page-about .about-partner {
  list-style: none;
  margin: 20px 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partner li {
  padding: 9px 18px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--about-text);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-partner li:hover {
  color: var(--c-lime);
  border-color: var(--c-lime);
  background: rgba(182, 255, 59, 0.07);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- responsive ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__media {
    margin-bottom: 6px;
  }
}

@media (min-width: 960px) {
  .page-about .about-body__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

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

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__item {
    display: block;
  }

  .page-about .about-toc__link {
    display: flex;
    align-items: baseline;
    width: 100%;
    padding: 13px 0;
    border: 0;
    border-bottom: 1px solid var(--c-line);
    border-radius: 0;
    font-size: 14px;
    line-height: 1.45;
    white-space: normal;
    background: transparent;
  }

  .page-about .about-toc__link:hover {
    background: transparent;
    border-bottom-color: var(--c-lime);
  }

  .page-about .about-tl__item {
    flex-basis: 224px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-tl__note,
  .page-about .about-tl__item::before,
  .page-about .about-partner li,
  .page-about .about-ch__points li,
  .page-about .about-flow__item,
  .page-about .about-inline-link {
    transition: none;
  }
}