.page-about {
  --about-rail-top: 104px;
  --about-radius: 18px;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  padding-top: 22px;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -160px -10% auto auto;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle at 60% 40%, rgba(47, 224, 255, 0.14), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  position: relative;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(32px, 7vw, 58px);
  margin: 14px 0 20px;
  color: var(--text-main);
}

.page-about .about-hero__lead .lede {
  max-width: 34em;
  color: var(--text-soft);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .hero-fact {
  background: var(--bg-carbon);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 200ms var(--ease);
}

.page-about .hero-fact:hover {
  background: var(--bg-graphite);
}

.page-about .hero-fact dt {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.page-about .hero-fact dd {
  margin: 0;
  font-size: 18px;
  color: var(--text-main);
  font-family: var(--font-display);
  font-weight: 700;
}

.page-about .hero-fact .num {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--accent-lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- Layout: 62 / 38 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 44px;
  padding-top: 8px;
  align-items: start;
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-rail {
  display: grid;
  gap: 16px;
  min-width: 0;
}

/* ---------- Chapter heading ---------- */
.page-about .chapter-head {
  margin-bottom: 22px;
}

.page-about .chapter-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.24;
  font-size: clamp(23px, 4.6vw, 36px);
  margin: 12px 0 10px;
  color: var(--text-main);
}

.page-about .chapter-head .note {
  max-width: 40em;
}

/* ---------- Band (team) ---------- */
.page-about .about-band {
  border-top: 1px solid var(--line);
  padding-top: 40px;
}

.page-about .about-band__figure {
  margin: 0 0 34px;
}

.page-about .about-band__figure img,
.page-about .data-split__figure img,
.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--about-radius);
  border: 1px solid var(--line);
  object-fit: cover;
  background: var(--bg-graphite);
}

.page-about .about-band__figure figcaption,
.page-about .timeline-figure figcaption {
  margin-top: 10px;
}

/* ---------- Team ring ---------- */
.page-about .team-figure {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
  margin-top: 34px;
  padding: 26px 22px;
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .ring {
  width: min(220px, 62vw);
  height: auto;
  margin: 0 auto;
  display: block;
}

.page-about .ring__seg {
  transition: opacity 200ms var(--ease), stroke-width 200ms var(--ease);
  cursor: default;
}

.page-about .ring__seg--data { stroke: var(--accent-lime); }
.page-about .ring__seg--tech { stroke: var(--accent-blue); }
.page-about .ring__seg--edit { stroke: var(--accent-orange); }
.page-about .ring__seg--video { stroke: var(--text-muted); }

.page-about .ring:hover .ring__seg {
  opacity: 0.3;
}

.page-about .ring .ring__seg:hover {
  opacity: 1;
  stroke-width: 20;
}

.page-about .ring__value {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  fill: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.page-about .ring__label {
  font-size: 11px;
  fill: var(--text-muted);
  letter-spacing: 0.08em;
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  grid-template-areas:
    "dot name num"
    "dot role role";
  gap: 2px 10px;
  align-items: center;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .team-legend__item:hover {
  background: var(--bg-graphite);
  border-color: var(--line);
}

.page-about .team-legend__dot {
  grid-area: dot;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  align-self: start;
  margin-top: 6px;
}

.page-about .team-legend__item--data .team-legend__dot { background: var(--accent-lime); }
.page-about .team-legend__item--tech .team-legend__dot { background: var(--accent-blue); }
.page-about .team-legend__item--edit .team-legend__dot { background: var(--accent-orange); }
.page-about .team-legend__item--video .team-legend__dot { background: var(--text-muted); }

.page-about .team-legend__name {
  grid-area: name;
  font-weight: 700;
  color: var(--text-main);
  font-size: 15px;
}

.page-about .team-legend__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.page-about .team-legend__role {
  grid-area: role;
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- Data section ---------- */
.page-about .data-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .data-split__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(47, 224, 255, 0.16), rgba(5, 7, 10, 0) 58%), var(--bg-carbon);
}

.page-about .data-split__figure img {
  border: 0;
  border-radius: 0;
  opacity: 0.92;
}

.page-about .checkflow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: checkflow;
}

.page-about .checkflow__step {
  position: relative;
  padding: 22px 20px 22px 22px;
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-strong);
  border-radius: var(--radius-md);
  transition: border-left-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .checkflow__step:hover,
.page-about .checkflow__step:focus-within {
  background: var(--bg-graphite);
  border-left-color: var(--accent-lime);
  transform: translateX(3px);
}

.page-about .checkflow__no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--accent-lime);
}

.page-about .checkflow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--text-main);
}

.page-about .checkflow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- Timeline ---------- */
.page-about .about-timeline {
  border-radius: var(--radius-lg);
  padding-inline: 18px;
}

.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime-line), rgba(232, 238, 244, 0.08));
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 12px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-void);
  border: 2px solid var(--accent-lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 60, 0.12);
}

.page-about .timeline__node {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-carbon);
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}

.page-about .timeline__node[open] {
  border-color: var(--lime-line);
  background: var(--bg-graphite);
}

.page-about .timeline__node:hover {
  border-color: var(--line-strong);
}

.page-about .timeline__node > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 15px 18px;
  outline-offset: 2px;
}

.page-about .timeline__node > summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-lime);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  min-width: 4.6em;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--text-main);
  flex: 1 1 auto;
}

.page-about .timeline__node > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 15px;
  transition: color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .timeline__node[open] > summary::after {
  content: "－";
  color: var(--accent-lime);
}

.page-about .timeline__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

.page-about .timeline-figure {
  margin: 30px 0 0;
}

/* ---------- Principles ---------- */
.page-about .principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .principle {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 16px;
  background: var(--bg-carbon);
  padding: 20px 20px;
  transition: background 200ms var(--ease);
}

.page-about .principle:hover {
  background: var(--bg-graphite);
}

.page-about .principle__no {
  font-family: var(--font-editorial);
  font-size: 22px;
  line-height: 1;
  color: var(--accent-lime);
  padding-top: 2px;
}

.page-about .principle__text {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- Right rail ---------- */
.page-about .rail-card {
  background: var(--bg-carbon);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 18px;
  box-shadow: var(--shadow-card);
}

.page-about .rail-card--accent {
  background:
    linear-gradient(160deg, rgba(182, 255, 60, 0.14), rgba(5, 7, 10, 0) 62%),
    var(--bg-carbon);
  border-color: var(--lime-line);
}

.page-about .rail-card__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--text-main);
}

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

.page-about .rail-card__actions {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .rail-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .rail-nav a {
  display: block;
  padding: 9px 10px;
  font-size: 14px;
  color: var(--text-soft);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: color 180ms var(--ease), border-left-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  color: var(--accent-lime);
  border-left-color: var(--accent-lime);
  background: rgba(182, 255, 60, 0.06);
}

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

.page-about .rail-stats li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .rail-stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .rail-stats__num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-stats__num small {
  font-size: 12px;
  color: var(--text-muted);
  margin-left: 2px;
}

.page-about .rail-stats__label {
  font-size: 13px;
  color: var(--text-muted);
  text-align: right;
}

/* ---------- Service block ---------- */
.page-about .about-service {
  margin-top: 40px;
  background: var(--bg-slice);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 52px;
  position: relative;
  overflow: hidden;
}

.page-about .about-service::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(182, 255, 60, 0.1), transparent 62%);
  pointer-events: none;
}

.page-about .about-service__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-service__lead h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.26;
  font-size: clamp(22px, 4.4vw, 32px);
  margin: 12px 0 14px;
  color: var(--text-main);
}

.page-about .service-list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .service-item {
  background: var(--bg-carbon);
  padding: 15px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .service-item dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-about .service-item dd {
  margin: 0;
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.6;
}

.page-about .service-item dd.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--accent-lime);
}

.page-about .service-item a {
  color: var(--accent-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .service-item a:hover {
  color: var(--accent-lime);
}

/* ---------- Responsive ---------- */
@media (min-width: 620px) {
  .page-about .checkflow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .service-item--wide {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 62fr 38fr;
    align-items: end;
    gap: 40px;
  }

  .page-about .hero-facts {
    grid-template-columns: 1fr;
  }

  .page-about .about-layout {
    grid-template-columns: 62fr 38fr;
    gap: 52px;
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-rail-top);
  }

  .page-about .team-figure {
    grid-template-columns: 280px 1fr;
    gap: 34px;
    padding: 30px 28px;
  }

  .page-about .data-split {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 34px;
  }

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

  .page-about .checkflow__step {
    padding: 26px 22px;
  }

  .page-about .about-service__inner {
    grid-template-columns: 38fr 62fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-inline: 30px;
  }

  .page-about .principle {
    padding: 22px 24px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .checkflow__step,
  .page-about .hero-fact,
  .page-about .ring__seg,
  .page-about .timeline__node,
  .page-about .principle,
  .page-about .team-legend__item {
    transition: opacity 160ms linear;
  }

  .page-about .checkflow__step:hover,
  .page-about .checkflow__step:focus-within {
    transform: none;
  }
}