.page-about {
  --about-line: var(--ink-line);
  --about-quiet: rgba(5, 9, 26, 0);
  display: block;
  padding-bottom: var(--sp-7);
  background:
    radial-gradient(900px 520px at 88% -6%, rgba(122, 68, 255, .16), transparent 62%),
    radial-gradient(680px 480px at 4% 14%, rgba(36, 227, 212, .08), transparent 60%);
}

.page-about .about-crumb {
  padding-top: var(--sp-3);
  padding-bottom: var(--sp-2);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding-top: var(--sp-2);
}

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

.page-about .about-hero__stamp {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-hero__stamp-num {
  font-family: var(--font-mono);
  font-size: clamp(78px, 25vw, 132px);
  font-weight: 300;
  line-height: .8;
  letter-spacing: -.05em;
  background: linear-gradient(118deg, var(--violet) 6%, var(--cyan) 92%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__stamp-txt {
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .about-hero__title {
  margin: var(--sp-2) 0 0;
  font-size: clamp(30px, 7.6vw, 52px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin-top: var(--sp-3);
  max-width: 62ch;
  color: var(--muted);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: var(--sp-3) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__figure {
  margin-top: var(--sp-5);
}

/* ---------- layout ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--sp-5);
  padding-top: var(--sp-6);
}

.page-about .about-flow {
  display: block;
  min-width: 0;
}

/* ---------- chapter index ---------- */
.page-about .about-index {
  position: sticky;
  top: var(--bar-h);
  z-index: 6;
  padding: 10px 0;
  background: linear-gradient(var(--ink-0) 72%, rgba(5, 9, 26, 0));
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__head {
  display: none;
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 11px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  background: var(--ink-1);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--text);
  border-color: var(--violet);
  background: var(--ink-2);
}

.page-about .about-index__list a .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--violet);
}

/* ---------- chapters ---------- */
.page-about .chapter {
  position: relative;
  padding: var(--sp-5) 0 var(--sp-6);
  border-top: 1px solid var(--about-line);
}

.page-about .chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 74px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  transform: skewX(-24deg);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter:first-child::before {
  display: none;
}

.page-about .chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: var(--sp-2);
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--violet);
}

.page-about .chapter__tag {
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--muted);
}

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

.page-about .chapter__title {
  margin: 0 0 var(--sp-3);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .chapter__main p {
  max-width: 66ch;
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .chapter__main a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- kpi ---------- */
.page-about .about-kpi {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: var(--sp-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-kpi .kpi {
  padding: 18px 16px;
  background: var(--ink-1);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
}

.page-about .about-kpi .kpi__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .about-kpi .kpi__unit {
  font-size: 15px;
  margin-left: 1px;
}

.page-about .about-kpi .kpi__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- team band ---------- */
.page-about .about-band__figure {
  margin: var(--sp-4) 0 var(--sp-4);
}

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

.page-about .band__item {
  position: relative;
  padding: 20px 18px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  clip-path: var(--cut-sm);
  transition: transform .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease);
}

.page-about .band__item::before {
  content: "";
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 12px;
  width: 3px;
  background: var(--band-color, var(--violet));
  border-radius: 2px;
}

.page-about .band__item--violet { --band-color: var(--violet); }
.page-about .band__item--cyan { --band-color: var(--cyan); }
.page-about .band__item--pink { --band-color: var(--pulse); }
.page-about .band__item--sand { --band-color: var(--sand); }

.page-about .band__item:hover,
.page-about .band__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--violet);
  background: #16204d;
}

.page-about .band__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.page-about .band__desc {
  margin: 0;
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- cadence ---------- */
.page-about .cadence {
  display: grid;
  gap: 1px;
  margin: var(--sp-4) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  clip-path: var(--cut);
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 16px;
  background: var(--ink-1);
}

.page-about .cadence__time {
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--gold);
}

.page-about .cadence__name {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
}

.page-about .cadence__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- source list ---------- */
.page-about .source-list {
  margin: var(--sp-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .source-list li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .source-list li:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .source-list__num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .source-list__txt {
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-note {
  margin-top: var(--sp-3) !important;
  font-size: 14.5px !important;
}

/* ---------- history / accordion ---------- */
.page-about .about-trail__figure {
  margin: 0 0 var(--sp-4);
}

.page-about .about-acc {
  margin-top: var(--sp-2);
}

.page-about .about-acc__item {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-acc__item:first-child {
  border-top: 1px solid var(--about-line);
}

.page-about .about-acc__body {
  padding: 4px 0 var(--sp-4) 0;
}

.page-about .about-acc__body p {
  max-width: 64ch;
  margin: 0 0 .9em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ---------- work ---------- */
.page-about .chapter--work .chapter__main {
  padding: var(--sp-4);
  background: linear-gradient(140deg, rgba(122, 68, 255, .16), rgba(11, 18, 48, .9) 58%);
  border: 1px solid var(--about-line);
  clip-path: var(--cut);
}

.page-about .about-work__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--sp-4);
}

/* ---------- tablet ---------- */
@media (min-width: 768px) {
  .page-about .chapter {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    gap: var(--sp-4);
  }

  .page-about .chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0;
  }

  .page-about .chapter__num {
    font-size: 54px;
  }

  .page-about .chapter__title {
    font-size: 25px;
  }

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

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

  .page-about .band__desc {
    max-width: none;
  }

  .page-about .about-hero__stamp-num {
    font-size: 150px;
  }
}

/* ---------- desktop ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: var(--sp-6);
    align-items: start;
  }

  .page-about .about-hero__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 6px;
  }

  .page-about .about-hero__lead {
    font-size: 17.5px;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) 138px;
    gap: var(--sp-6);
    align-items: start;
  }

  .page-about .about-flow {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-index {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 96px;
    align-self: start;
    overflow: visible;
    padding: 0;
    background: none;
  }

  .page-about .about-index__head {
    display: block;
    margin: 0 0 14px;
    font-size: 12px;
    letter-spacing: .26em;
    color: var(--stone);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 1px;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-index__list a {
    background: none;
    border: 0;
    border-left: 2px solid transparent;
    clip-path: none;
    margin-left: -1px;
    padding: 9px 10px;
    font-size: 13.5px;
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    background: rgba(122, 68, 255, .1);
    border-left-color: var(--violet);
  }

  .page-about .chapter {
    grid-template-columns: 152px minmax(0, 1fr);
    gap: var(--sp-6);
    padding: var(--sp-6) 0 var(--sp-7);
  }

  .page-about .chapter__num {
    font-size: 72px;
  }

  .page-about .chapter__title {
    font-size: 28px;
  }

  .page-about .chapter__main p {
    font-size: 17px;
  }

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

  .page-about .cadence__row {
    grid-template-columns: 84px minmax(0, 1fr);
    padding: 22px 24px;
  }

  .page-about .source-list li {
    grid-template-columns: 104px minmax(0, 1fr);
  }

  .page-about .about-kpi .kpi__num {
    font-size: 34px;
  }

  .page-about .chapter--work .chapter__main {
    padding: var(--sp-5) var(--sp-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .band__item {
    transition: none;
  }

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