.page-about {
  --tl-col: 56px;
  --about-indent: 16px;
  position: relative;
  padding-bottom: 64px;
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  padding: 24px 0 44px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(47, 227, 210, 0.10), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(242, 180, 87, 0.08), transparent 62%);
}

.page-about .about-hero__kicker {
  margin: 22px 0 0;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 8.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__facts > div {
  min-width: 0;
}

.page-about .about-hero__facts dt {
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

/* ---------- Chapter shell ---------- */

.page-about .about-chapter {
  padding: 46px 0 6px;
}

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

.page-about .gkk-section__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 36px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .gkk-section__lead {
  margin: 14px 0 0;
  max-width: 620px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-chapter__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-chapter__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- A-02 pillars ---------- */

.page-about .about-pillars-sec .gkk-section__head {
  margin-bottom: 4px;
}

.page-about .about-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-pillar {
  position: relative;
  background: var(--ink-800);
  padding: 22px 20px 24px;
  min-width: 0;
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  opacity: 0.55;
}

.page-about .about-pillar__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-pillar__t {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-pillar__d {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- A-03 timeline ---------- */

.page-about .about-tl__media {
  margin: 26px 0 0;
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-col) / 2 - 1px);
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, #8FB0C4 50%, var(--cyan) 100%);
  opacity: 0.55;
}

.page-about .tl__row {
  display: grid;
  grid-template-columns: var(--tl-col) minmax(0, 1fr);
  gap: var(--about-indent);
  padding-bottom: 34px;
  scroll-margin-top: 90px;
}

.page-about .tl__mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 2px;
}

.page-about .tl__no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--tone, var(--muted));
  background: var(--ink-900);
  padding: 2px 5px;
  border-radius: 4px;
  border: 1px solid var(--line);
}

.page-about .tl__dot {
  width: 14px;
  height: 14px;
  margin-top: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--tone, var(--line));
  box-shadow: 0 0 0 4px var(--ink-900);
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .tl__row--s1 { --tone: #F2B457; }
.page-about .tl__row--s2 { --tone: #E5A254; }
.page-about .tl__row--s3 { --tone: #B9B37A; }
.page-about .tl__row--s4 { --tone: #79C6BC; }
.page-about .tl__row--s5 { --tone: #46D7C8; }
.page-about .tl__row--s6 { --tone: var(--cyan); }

.page-about .tl__row:hover .tl__dot,
.page-about .tl__row:focus-within .tl__dot {
  background: var(--tone, var(--cyan));
  box-shadow: 0 0 0 4px var(--ink-900), 0 0 18px -2px var(--tone, var(--cyan));
}

.page-about .tl__body {
  min-width: 0;
  padding-top: 2px;
}

.page-about .tl__date {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .tl__title {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.34;
  color: var(--text);
}

.page-about .tl__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .tl__peek {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border-left: 2px solid var(--cyan-dim);
  padding-left: 10px;
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease), margin 0.28s var(--ease);
}

.page-about .tl__row:hover .tl__peek,
.page-about .tl__row:focus-within .tl__peek {
  max-height: 60px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .tl__gap {
  display: grid;
  grid-template-columns: var(--tl-col) minmax(0, 1fr);
  gap: var(--about-indent);
  padding-bottom: 34px;
}

.page-about .tl__gap > span {
  grid-column: 2;
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  min-width: 0;
}

/* ---------- A-04 versions ---------- */

.page-about .about-vers-sec .gkk-section__head {
  margin-bottom: 6px;
}

.page-about .about-vers-grid {
  margin-top: 22px;
}

.page-about .about-vers__note {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 58ch;
}

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

.page-about .about-vers__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-vers__k {
  font-size: 14px;
  color: var(--muted);
  min-width: 0;
}

.page-about .about-vers__v {
  flex: none;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.03em;
  color: var(--gold);
  text-align: right;
}

.page-about .about-vers__media {
  margin: 22px 0 0;
}

/* ---------- A-05 team ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-team__card {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  min-width: 0;
  backdrop-filter: blur(6px);
}

.page-about .about-team__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-team__foot {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--gold);
  background: var(--ink-800);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- CTA ---------- */

.page-about .about-cta {
  padding: 46px 0 10px;
}

.page-about .about-cta__box {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px 28px;
  background:
    linear-gradient(135deg, rgba(47, 227, 210, 0.12), transparent 55%),
    linear-gradient(315deg, rgba(242, 180, 87, 0.10), transparent 60%),
    var(--ink-800);
  overflow: hidden;
}

.page-about .about-cta__box .gkk-index {
  margin: 0;
  color: var(--gold);
}

.page-about .about-cta__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-size: clamp(21px, 5vw, 30px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--text);
  max-width: 22ch;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 56ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- A-06 filing ---------- */

.page-about .about-filing-sec {
  padding-top: 50px;
}

.page-about .about-filing__grid {
  margin-top: 24px;
}

.page-about .about-filing__panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 4px 18px;
}

.page-about .about-filing__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-filing__k {
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .about-filing__v {
  font-size: 14.5px;
  color: var(--text);
  text-align: right;
  word-break: break-word;
}

.page-about .about-filing__v--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: var(--gold);
}

.page-about .about-filing__note {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 58ch;
}

.page-about .about-filing__media {
  margin: 22px 0 0;
}

/* ---------- Tablet ---------- */

@media (min-width: 600px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

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

  .page-about .about-cta__box {
    padding: 34px 32px 36px;
  }
}

/* ---------- Desktop ---------- */

@media (min-width: 900px) {
  .page-about {
    --tl-col: 84px;
    --about-indent: 24px;
  }

  .page-about .about-hero {
    padding: 40px 0 60px;
  }

  .page-about .about-chapter {
    padding: 68px 0 10px;
  }

  .page-about .about-chapter__body {
    padding-left: 28px;
  }

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

  .page-about .about-pillar {
    padding: 26px 22px 28px;
  }

  .page-about .tl__title {
    font-size: 21px;
  }

  .page-about .tl__row,
  .page-about .tl__gap {
    padding-bottom: 44px;
  }

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

  .page-about .about-vers__media,
  .page-about .about-filing__media {
    margin-top: 0;
    height: 100%;
  }

  .page-about .about-cta__box {
    padding: 42px 44px 44px;
  }
}

/* ---------- Reduced motion ---------- */

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