.page-about {
  --about-grid: rgba(191, 217, 222, 0.55);
  --about-grid-dark: rgba(191, 217, 222, 0.16);
  background-color: var(--c-salt);
  color: var(--c-ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-block: calc(var(--topbar-h) + 18px) 14px;
}

.page-about .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-rock);
}

.page-about .breadcrumbs a {
  color: var(--c-lake);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t) var(--ease);
}

.page-about .breadcrumbs a:hover {
  border-bottom-color: var(--c-flag);
}

.page-about .breadcrumbs span[aria-hidden] {
  margin-inline: 8px;
  color: var(--c-line);
}

.page-about .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-deep);
  margin: 0 0 14px;
  padding-left: 14px;
  position: relative;
}

.page-about .eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 10px;
  height: 1px;
  background: var(--c-flag);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--c-ink);
}

.page-about h1 {
  font-size: clamp(34px, 8vw, 68px);
  line-height: 1.04;
  max-width: 15em;
}

.page-about h2 {
  font-size: clamp(25px, 4.6vw, 40px);
  line-height: 1.08;
  margin-bottom: 18px;
}

.page-about h3 {
  font-size: 17px;
  line-height: 1.3;
  font-weight: 800;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  border-bottom: 1px solid var(--c-line);
  background-image: repeating-linear-gradient(
    to right,
    var(--about-grid) 0 1px,
    transparent 1px 96px
  );
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
  padding-block: 22px 54px;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-ink);
}

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

.page-about .btn {
  display: inline-block;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border: 1px solid var(--c-lake);
  background: transparent;
  color: var(--c-deep);
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease),
    border-color var(--t) var(--ease);
}

.page-about .btn--primary {
  background: var(--c-lake);
  border-color: var(--c-lake);
  color: var(--c-salt);
}

.page-about .btn--primary:hover {
  background: var(--c-deep);
  border-color: var(--c-deep);
}

.page-about .btn--flag {
  background: var(--c-flag);
  border-color: var(--c-flag);
  color: var(--c-salt);
}

.page-about .btn--ghost:hover {
  border-color: var(--c-flag);
  color: var(--c-flag);
}

.page-about .about-hero__panel {
  background: var(--c-night);
  color: var(--c-salt);
  padding: 26px 24px 28px;
  border-top: 3px solid var(--c-flag);
}

.page-about .about-hero__panel-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-flag-soft);
}

.page-about .about-hero__big {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(64px, 16vw, 104px);
  line-height: 0.9;
  margin: 6px 0 4px;
  letter-spacing: -0.03em;
  color: var(--c-salt);
}

.page-about .about-hero__panel-note {
  margin: 0 0 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-line);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--about-grid-dark);
  padding-top: 16px;
  font-size: 13px;
  color: var(--c-salt);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-hero__facts .mono {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-flag-soft);
  min-width: 3.6em;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- shared sections ---------- */
.page-about .about-sec {
  padding-block: 54px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-sec--paper {
  background: var(--c-paper);
}

.page-about .about-sec--night {
  background: var(--c-night);
  color: var(--c-salt);
  border-bottom-color: var(--c-deep);
  background-image: repeating-linear-gradient(
    to right,
    var(--about-grid-dark) 0 1px,
    transparent 1px 96px
  );
}

.page-about .about-sec--night h2,
.page-about .about-sec--night h3 {
  color: var(--c-salt);
}

.page-about .about-sec--night .eyebrow {
  color: var(--c-flag-soft);
}

.page-about .about-lead {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink);
  margin: 0 0 28px;
}

.page-about .about-lead--light {
  color: var(--c-line);
}

.page-about .prose p {
  margin: 0 0 1.15em;
  font-size: 15px;
  line-height: 1.82;
  max-width: 62ch;
}

.page-about .prose a {
  color: var(--c-lake);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .prose a:hover {
  color: var(--c-flag);
  border-bottom-color: var(--c-flag);
}

.page-about .link-more {
  color: var(--c-lake);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--c-flag);
  padding-bottom: 1px;
}

.page-about .link-more:hover {
  color: var(--c-flag);
}

/* ---------- why ---------- */
.page-about .about-why {
  display: grid;
  gap: 34px;
}

.page-about .about-why__aside {
  border-top: 2px solid var(--c-lake);
  background: var(--c-paper);
  padding: 20px 20px 24px;
  align-self: start;
}

.page-about .about-why__aside-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-deep);
}

.page-about .about-metrics {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-metrics > div {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-metrics > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-metrics dt {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-rock);
}

.page-about .about-metrics dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--c-ink);
}

/* ---------- roles ---------- */
.page-about .about-roles {
  display: grid;
  gap: 30px;
}

.page-about .about-roles .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-roles .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 8px 12px;
  border: 1px solid var(--c-line);
  background: transparent;
  color: var(--c-deep);
  cursor: pointer;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease),
    background-color var(--t) var(--ease);
}

.page-about .about-roles .filter-btn:hover {
  border-color: var(--c-lake);
}

.page-about .about-roles .filter-btn[aria-pressed="true"] {
  border-color: var(--c-flag);
  color: var(--c-flag);
  border-bottom-width: 2px;
  background: rgba(226, 118, 45, 0.07);
}

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

.page-about .role-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 6px 12px;
  padding: 18px 4px 18px 14px;
  border-bottom: 1px solid var(--c-line);
  position: relative;
  transition: background-color var(--t) var(--ease);
}

.page-about .role-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: transparent;
  transition: background-color var(--t) var(--ease);
}

.page-about .role-row:hover::before {
  background: var(--c-lake);
}

.page-about .role-row:hover {
  background: rgba(14, 110, 140, 0.05);
}

.page-about .role-row__code {
  font-size: 11px;
  color: var(--c-rock);
  align-self: center;
}

.page-about .role-row__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--c-deep);
  align-self: center;
}

.page-about .role-row__num {
  font-size: 13px;
  color: var(--c-flag);
  align-self: center;
}

.page-about .role-row__desc {
  grid-column: 1 / -1;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-ink);
}

.page-about .about-roles__figure {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-salt);
}

.page-about .about-roles__figure img,
.page-about .check-figure img,
.page-about .about-ver-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--c-rock);
  padding: 10px 12px;
  border-top: 1px solid var(--c-line);
}

/* ---------- versions ---------- */
.page-about .ver-track {
  display: grid;
  gap: 14px;
  margin-bottom: 30px;
}

.page-about .ver-node {
  background: rgba(244, 247, 246, 0.05);
  border: 1px solid rgba(191, 217, 222, 0.28);
  border-left: 2px solid var(--c-line);
  padding: 16px 18px;
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .ver-node:hover,
.page-about .ver-node:focus-within {
  border-color: var(--c-flag-soft);
  background: rgba(226, 118, 45, 0.08);
}

.page-about .ver-node--flag {
  border-left-color: var(--c-flag);
}

.page-about .ver-node summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 4px 12px;
  align-items: baseline;
}

.page-about .ver-node summary::-webkit-details-marker {
  display: none;
}

.page-about .ver-node__no {
  font-size: 12px;
  color: var(--c-flag-soft);
}

.page-about .ver-node__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--c-salt);
}

.page-about .ver-node__year {
  font-size: 12px;
  color: var(--c-line);
}

.page-about .ver-node__peek {
  grid-column: 1 / -1;
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-line);
  transition: max-height var(--t) var(--ease), opacity var(--t) var(--ease),
    margin-top var(--t) var(--ease);
}

.page-about .ver-node:hover .ver-node__peek,
.page-about .ver-node:focus-within .ver-node__peek {
  max-height: 5em;
  opacity: 1;
  margin-top: 6px;
}

.page-about .ver-node__body {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--c-lake);
}

.page-about .ver-node__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--c-salt);
  max-width: 58ch;
}

.page-about .about-ver-figure {
  margin: 0 0 18px;
  border: 1px solid rgba(191, 217, 222, 0.28);
  background: rgba(244, 247, 246, 0.04);
}

.page-about .about-ver-figure .media__caption {
  color: var(--c-line);
  border-top-color: rgba(191, 217, 222, 0.28);
}

.page-about .about-note {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--c-flag-soft);
  margin: 0;
}

/* ---------- check flow ---------- */
.page-about .check-flow {
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  counter-reset: step;
}

.page-about .check-step {
  position: relative;
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  padding: 16px 18px 18px;
}

.page-about .check-step::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -13px;
  margin-left: -6px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--c-flag);
}

.page-about .check-step:last-child::after {
  display: none;
}

.page-about .check-step__no {
  display: block;
  font-size: 11px;
  color: var(--c-lake);
  margin-bottom: 8px;
}

.page-about .check-step h3 {
  color: var(--c-deep);
  margin-bottom: 8px;
}

.page-about .check-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-ink);
}

.page-about .check-bottom {
  display: grid;
  gap: 26px;
}

.page-about .check-figure {
  margin: 0;
  border: 1px solid var(--c-line);
  background: var(--c-salt);
}

.page-about .check-note {
  border-top: 2px solid var(--c-flag);
  padding-top: 18px;
}

.page-about .check-note h3 {
  color: var(--c-deep);
  margin-bottom: 12px;
}

.page-about .check-note p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.78;
  max-width: 52ch;
}

/* ---------- peer ---------- */
.page-about .about-peer {
  display: grid;
  gap: 30px;
}

.page-about .about-peer p {
  margin: 0 0 1.1em;
  font-size: 15px;
  line-height: 1.82;
  max-width: 60ch;
}

.page-about .peer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--c-deep);
  align-self: start;
}

.page-about .peer-list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 14px 4px;
  border-bottom: 1px solid var(--c-line);
  font-size: 14px;
  line-height: 1.65;
}

.page-about .peer-list .mono {
  font-size: 12px;
  color: var(--c-flag);
}

/* ---------- cta ---------- */
.page-about .about-cta {
  background: var(--c-lake);
  color: var(--c-salt);
  padding-block: 48px;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-cta h2 {
  color: var(--c-salt);
  font-size: clamp(24px, 4.4vw, 36px);
  margin-bottom: 14px;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 246, 0.92);
}

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

.page-about .about-cta .btn--ghost {
  border-color: rgba(244, 247, 246, 0.7);
  color: var(--c-salt);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--c-salt);
  background: rgba(244, 247, 246, 0.12);
  color: var(--c-salt);
}

/* ---------- desktop ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(280px, 0.68fr);
    align-items: end;
    gap: 48px;
    padding-block: 34px 72px;
  }

  .page-about .about-hero__panel {
    padding: 34px 30px 32px;
    clip-path: polygon(11% 0, 100% 0, 100% 100%, 0 100%);
    margin-right: -8px;
  }

  .page-about .about-hero__text {
    padding-bottom: 10px;
  }

  .page-about .about-sec {
    padding-block: 76px;
  }

  .page-about .about-why {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 56px;
  }

  .page-about .about-roles {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    gap: 44px;
  }

  .page-about .about-roles__figure {
    align-self: start;
  }

  .page-about .role-row {
    grid-template-columns: 64px 150px 64px 1fr;
    align-items: baseline;
    gap: 14px;
    padding-block: 20px;
  }

  .page-about .role-row__desc {
    grid-column: 4;
  }

  .page-about .about-roles .filter-bar {
    margin-bottom: 26px;
  }

  .page-about .ver-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    position: relative;
    border-top: 1px solid rgba(191, 217, 222, 0.28);
    margin-bottom: 40px;
  }

  .page-about .ver-node {
    border-left: 0;
    border-right: 1px solid rgba(191, 217, 222, 0.2);
    border-top: 0;
    border-bottom: 0;
    background: transparent;
    padding: 24px 22px 26px;
    position: relative;
  }

  .page-about .ver-node::before {
    content: "";
    position: absolute;
    top: -5px;
    left: 22px;
    width: 9px;
    height: 9px;
    background: var(--c-line);
  }

  .page-about .ver-node--flag::before {
    background: var(--c-flag);
  }

  .page-about .ver-node:last-child {
    border-right: 0;
  }

  .page-about .ver-node:hover,
  .page-about .ver-node:focus-within {
    background: rgba(226, 118, 45, 0.09);
  }

  .page-about .ver-node summary {
    grid-template-columns: auto 1fr;
    row-gap: 8px;
  }

  .page-about .ver-node__year {
    grid-column: 1 / -1;
    order: -1;
  }

  .page-about .check-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .check-step::after {
    left: auto;
    right: -16px;
    bottom: auto;
    top: calc(50% - 5px);
    margin-left: 0;
    border-left: 8px solid var(--c-flag);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
  }

  .page-about .check-bottom {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-peer {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    gap: 56px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__inner {
    padding-block: 44px 86px;
  }

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

  .page-about .prose p,
  .page-about .about-peer p,
  .page-about .check-note p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}