.page-about {
  --about-rule: 2px solid var(--c-line);
  --about-gap: clamp(16px, 3vw, 24px);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .about-intro {
  border-bottom: var(--about-rule);
  background-color: var(--c-bg);
  background-image:
    radial-gradient(120% 90% at 6% 0%, rgba(46, 242, 208, 0.11), transparent 62%),
    repeating-linear-gradient(90deg, rgba(43, 53, 102, 0.42) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(43, 53, 102, 0.28) 0 1px, transparent 1px 72px);
}

.page-about .about-intro__inner {
  display: grid;
  gap: var(--sp-4);
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-5);
}

.page-about .about-intro__lead {
  display: grid;
  gap: var(--sp-3);
  max-width: 880px;
}

.page-about .about-intro__lead h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.page-about .about-intro__lead h1 em {
  font-style: normal;
  color: var(--c-neon);
}

.page-about .about-intro__lead .lede {
  margin: 0;
  max-width: 660px;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-mute);
}

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

.page-about .about-intro__aside {
  display: grid;
  gap: var(--sp-3);
  align-content: start;
}

.page-about .about-intro__note {
  margin: 0;
  padding-left: var(--sp-2);
  border-left: 2px solid var(--c-neon);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.9;
  color: var(--c-neon-soft);
}

.page-about .about-intro__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  background: var(--c-line);
  border: var(--about-rule);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 12px 10px;
  background: var(--c-panel);
}

.page-about .about-stat__value {
  order: -1;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-20);
  letter-spacing: -0.01em;
  color: var(--c-neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 11px;
  line-height: 1.45;
  color: var(--c-mute);
}

.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 5;
  background: var(--c-ink);
  border-bottom: var(--about-rule);
}

.page-about .about-index__inner {
  display: flex;
  gap: var(--sp-1);
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 2px solid var(--c-line);
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--c-mute);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-neon);
  border-color: var(--c-neon);
  background: rgba(46, 242, 208, 0.07);
}

.page-about .about-index__n {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-neon);
}

.page-about .about-sec {
  padding: var(--sp-5) 0;
  border-bottom: var(--about-rule);
  scroll-margin-top: calc(var(--header-h) + 56px);
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .about-sec__head {
  display: grid;
  gap: 10px;
  max-width: 820px;
  margin-bottom: var(--sp-4);
}

.page-about .about-sec__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--c-neon);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-about .about-sec__head .lede {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-mute);
}

.page-about .about-sec__body {
  max-width: 680px;
}

.page-about .about-copy p {
  margin: 0 0 1.1em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--c-mute);
}

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

.page-about .about-copy a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-copy a:hover {
  color: var(--c-neon-soft);
}

.page-about .about-team {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-team__text {
  max-width: 680px;
}

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

.page-about .media-frame {
  margin: 0;
  border: var(--about-rule);
  background: var(--c-panel);
  overflow: hidden;
}

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

.page-about .media-frame__cap {
  padding: 10px 14px;
  border-top: var(--about-rule);
  background: var(--c-ink);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--c-mute);
}

.page-about .about-rhythm {
  display: grid;
  gap: 2px;
  margin-top: var(--sp-4);
  background: var(--c-line);
  border: var(--about-rule);
}

.page-about .about-rhythm__col {
  padding: var(--sp-3);
  background: var(--c-panel);
}

.page-about .about-rhythm__col h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 800;
  color: var(--c-white);
}

.page-about .about-rhythm__col h3::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  background: var(--c-neon);
}

.page-about .about-rhythm__col--off h3::before {
  background: var(--c-safe);
}

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

.page-about .about-rhythm__col li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-rhythm__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--c-line);
  background: var(--c-bg);
}

.page-about .about-data {
  display: grid;
  gap: var(--sp-4);
}

.page-about .about-data__text {
  max-width: 680px;
}

.page-about .about-flow {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--c-line);
  border: var(--about-rule);
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  padding: var(--sp-2) var(--sp-3);
  background: var(--c-panel);
}

.page-about .about-flow__n {
  grid-row: span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-20);
  color: var(--c-neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow__k {
  font-size: var(--fs-16);
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-flow__d {
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--c-mute);
}

.page-about .about-version__figure {
  margin-bottom: var(--sp-4);
}

.page-about .about-rail {
  position: relative;
}

.page-about .about-rail__list {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  margin: 0;
  padding: 2px 2px 16px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .about-rail__list > .about-node {
  flex: 0 0 min(78vw, 300px);
  scroll-snap-align: start;
}

.page-about .about-node {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--sp-3);
  background: var(--c-panel);
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: var(--c-neon);
  box-shadow: var(--shadow-neon);
}

.page-about .about-node--current {
  border-color: var(--c-neon);
}

.page-about .about-node__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.page-about .about-node__v {
  padding: 2px 8px;
  background: var(--c-neon);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-weight: 700;
}

.page-about .about-node__tag {
  padding: 2px 6px;
  border: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-mute);
}

.page-about .about-node--current .about-node__tag {
  border-color: var(--c-orange);
  color: var(--c-orange);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-20);
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .about-node__sum {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-node__btn {
  align-self: flex-start;
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 2px solid var(--c-line);
  background: transparent;
  color: var(--c-neon-soft);
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-node__btn::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.page-about .about-node__btn[aria-expanded="true"] {
  border-color: var(--c-neon);
  color: var(--c-neon);
  background: rgba(46, 242, 208, 0.08);
}

.page-about .about-node__btn[aria-expanded="true"]::after {
  content: "\2212";
}

.page-about .about-node__panel {
  display: none;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
}

.page-about .about-node__panel[data-open] {
  display: block;
}

.page-about .about-node__panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--c-mute);
}

.page-about .about-eco {
  display: grid;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}

.page-about .about-eco__item {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: var(--sp-3);
  background: var(--c-panel);
  border: var(--about-rule);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-eco__item:hover {
  border-color: var(--c-neon);
  background: #182048;
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-safe);
}

.page-about .about-eco__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.3;
  color: var(--c-white);
  transition: font-size 0.2s ease, color 0.2s ease;
}

.page-about .about-eco__sub {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-mute);
  transition: font-size 0.2s ease, color 0.2s ease;
}

.page-about .about-eco__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-eco__item:hover .about-eco__title {
  font-size: 15px;
  color: var(--c-safe);
}

.page-about .about-eco__item:hover .about-eco__sub {
  font-size: 17px;
  color: var(--c-neon-soft);
}

.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--sp-3);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-node,
  .page-about .about-node__btn,
  .page-about .about-eco__item,
  .page-about .about-eco__title,
  .page-about .about-eco__sub {
    transition: none;
  }
}

@media (min-width: 720px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-rail__list > .about-node {
    flex: 0 0 320px;
  }
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__step {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding: var(--sp-3) var(--sp-2);
  }

  .page-about .about-flow__n {
    grid-row: auto;
    align-self: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-intro__inner {
    grid-template-columns: minmax(0, 1fr) 280px;
    align-items: end;
    gap: var(--sp-5);
    padding-top: var(--sp-5);
  }

  .page-about .about-intro__aside {
    padding-bottom: 8px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
    gap: var(--sp-5);
  }

  .page-about .about-data {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
    gap: var(--sp-5);
  }

  .page-about .about-stat__value {
    font-size: var(--fs-28);
  }
}

@media (min-width: 1200px) {
  .page-about .about-rail__list > .about-node {
    flex: 0 0 340px;
  }
}
<<<END>>>