.page-about {
  --about-rail: 132px;
  --about-hair: rgba(27, 34, 43, .9);
  --about-glow: rgba(0, 240, 212, .06);
  position: relative;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: calc(var(--header-h) + clamp(36px, 6vw, 68px));
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -34%;
  right: -18%;
  width: min(760px, 92vw);
  height: min(760px, 92vw);
  background: radial-gradient(circle at 50% 50%, rgba(0, 240, 212, .16), rgba(0, 240, 212, 0) 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
}

.page-about .about-hero__title {
  margin: .38em 0 0;
  max-width: 21ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.2vw, 4.05rem);
  line-height: 1.04;
  letter-spacing: -.022em;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 50ch;
  margin-top: 22px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  background: var(--panel);
}

.page-about .about-fact dt {
  margin: 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  letter-spacing: .02em;
  color: var(--cyan);
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: end;
  }
}

/* ---------- Numbered sections ---------- */
.page-about .about-section {
  position: relative;
}

.page-about .about-section__inner {
  display: grid;
  gap: 18px;
}

.page-about .about-section__index {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-index {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.3rem, 6vw, 3.4rem);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--muted);
  opacity: .5;
}

.page-about .about-index__label {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

@media (min-width: 900px) {
  .page-about .about-section__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-section__index {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding-bottom: 0;
    padding-left: 18px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-index__label {
    margin-top: 12px;
  }
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: -.01em;
}

.page-about .about-section__desc {
  margin-top: 16px;
  max-width: 62ch;
}

/* ---------- 01 business lines ---------- */
.page-about .about-lines {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-line {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 22px 0;
  background: var(--bg);
  transition: background var(--dur) var(--ease);
}

.page-about .about-line:hover {
  background: var(--about-glow);
}

.page-about .about-line__no {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-line__text p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.page-about .about-line__note {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-line__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 212, .35);
}

.page-about .about-line__note a:hover {
  border-bottom-color: var(--cyan);
}

@media (min-width: 640px) {
  .page-about .about-line {
    grid-template-columns: 64px minmax(0, 1fr);
    padding: 26px 20px;
  }
}

/* ---------- 02 coverage ---------- */
.page-about .about-regions {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-region {
  position: relative;
  padding: 18px 16px 16px;
  background: var(--panel);
  transition: background var(--dur) var(--ease);
}

.page-about .about-region::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-region:hover,
.page-about .about-region:focus-within {
  background: var(--about-glow);
}

.page-about .about-region:hover::before,
.page-about .about-region:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-region__code {
  display: block;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-region__name {
  display: block;
  margin-top: 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.page-about .about-region__count {
  display: block;
  margin-top: 6px;
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-region__unit {
  margin-left: 6px;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-region__detail {
  display: block;
  max-height: 0;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  opacity: 0;
  transition: max-height var(--dur) var(--ease), margin-top var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .about-region:hover .about-region__detail,
.page-about .about-region:focus-within .about-region__detail {
  max-height: 60px;
  margin-top: 10px;
  opacity: 1;
}

.page-about .about-databar {
  margin-top: clamp(30px, 4vw, 46px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  padding: 1px;
  background: linear-gradient(100deg, rgba(0, 240, 212, .5), rgba(123, 77, 255, .35) 70%, rgba(27, 34, 43, .6));
}

.page-about .about-databar__item {
  background: var(--panel-2);
  padding: 22px 20px;
}

.page-about .about-databar__num {
  display: block;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-databar__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-about .about-coverage__figure {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 03 team ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
  margin-top: 34px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-role__no {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-role__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-role p {
  margin: 8px 0 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--muted);
}

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

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .82fr);
    gap: clamp(32px, 5vw, 62px);
    align-items: start;
  }
}

/* ---------- 04 versions ---------- */
.page-about .about-versions__figure {
  margin: 34px 0 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-timeline__node {
  background: var(--panel);
}

.page-about .about-timeline__link {
  position: relative;
  display: block;
  height: 100%;
  padding: 26px 22px 30px;
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease);
}

.page-about .about-timeline__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), rgba(0, 240, 212, 0));
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  background: var(--about-glow);
}

.page-about .about-timeline__link:hover::before,
.page-about .about-timeline__link:focus-visible::before {
  opacity: 1;
}

.page-about .about-timeline__year {
  display: block;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .about-timeline__ver {
  display: block;
  margin-top: 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--text);
}

.page-about .about-timeline__title {
  display: block;
  margin-top: 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--cyan);
}

.page-about .about-timeline__desc {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 05 rhythm ---------- */
.page-about .about-cadence {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cadence__item {
  background: var(--panel);
  padding: 24px 20px;
  transition: background var(--dur) var(--ease);
}

.page-about .about-cadence__item:hover {
  background: var(--about-glow);
}

.page-about .about-cadence__num {
  display: block;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-cadence__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--text);
  letter-spacing: .01em;
}

.page-about .about-cadence__note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-rhythm__service {
  margin-top: 28px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-rhythm__service a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 212, .35);
}

.page-about .about-rhythm__service a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 06 credentials ---------- */
.page-about .about-credentials {
  margin-top: 32px;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-credential {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  padding: 18px 20px;
  background: var(--panel);
}

.page-about .about-credential__key {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-credential__value {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .03em;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-credentials__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- shared figure tuning ---------- */
.page-about .figure__caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line,
  .page-about .about-region,
  .page-about .about-region__detail,
  .page-about .about-region::before,
  .page-about .about-timeline__link,
  .page-about .about-timeline__link::before,
  .page-about .about-cadence__item {
    transition: none;
  }
}
</main>