.page-about {
  --ab-rule: 1px solid var(--grid);
  --ab-gap: clamp(20px, 3vw, 40px);
  background: var(--ink);
  color: var(--paper);
}

.page-about .ab-shell {
  width: 100%;
  max-width: var(--frame-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.page-about .ab-shell a {
  color: inherit;
}

/* ---------- hero ---------- */
.page-about .ab-hero {
  padding-block: clamp(24px, 4vw, 44px) clamp(24px, 4vw, 48px);
  border-bottom: var(--ab-rule);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.page-about .ab-kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--signal);
  flex: none;
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h1);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-hero__lead {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 1.15vw, 19px);
  line-height: 1.75;
  color: var(--mist-strong);
}

.page-about .ab-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ab-fig {
  background: var(--panel);
  padding: 16px clamp(12px, 2vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .ab-fig__num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1;
  color: var(--paper);
}

.page-about .ab-fig__plus {
  color: var(--signal);
  font-size: 0.62em;
  margin-left: 4px;
}

.page-about .ab-fig__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- layout ---------- */
.page-about .ab-layout {
  display: grid;
  gap: var(--ab-gap);
  padding-block: clamp(28px, 4vw, 56px) clamp(40px, 6vw, 88px);
}

.page-about .ab-toc-col {
  min-width: 0;
}

.page-about .ab-toc {
  border: var(--ab-rule);
  padding: 16px clamp(12px, 2vw, 18px);
  background: var(--panel);
}

.page-about .ab-toc .toc__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-toc .toc__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .ab-toc .toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 10px;
  border-left: 1px solid var(--grid);
  font-size: 14px;
  line-height: 1.5;
  color: var(--mist-strong);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-toc .toc__link:hover,
.page-about .ab-toc .toc__link.is-active {
  color: var(--paper);
  border-left-color: var(--signal);
}

.page-about .ab-toc .toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--signal);
  flex: none;
}

.page-about .ab-body {
  min-width: 0;
}

/* ---------- sections ---------- */
.page-about .ab-sec {
  border-top: var(--ab-rule);
  padding-top: clamp(24px, 3vw, 40px);
}

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

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(36px, 5vw, 72px);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .ab-sec__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--signal);
  flex: none;
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-h2);
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--paper);
}

.page-about .ab-prose p {
  margin: 0 0 1em;
  max-width: 62ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--mist-strong);
}

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

.page-about .ab-prose strong {
  color: var(--paper);
  font-weight: 500;
}

.page-about .ab-prose--tight {
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-quote {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: clamp(18px, 3vw, 30px);
  background: var(--paper);
  color: var(--ink);
  border-left: 4px solid var(--signal);
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.6;
}

/* ---------- three lines ---------- */
.page-about .ab-lines {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-line {
  background: var(--panel);
  padding: clamp(14px, 2vw, 22px);
  display: grid;
  gap: 10px;
}

.page-about .ab-line__code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .ab-line__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .ab-line__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-line__link {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  justify-self: start;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- process steps ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-step {
  background: var(--panel);
  padding: clamp(14px, 2vw, 24px);
}

.page-about .ab-step__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .ab-step h3 {
  margin: 8px 0 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- figures ---------- */
.page-about .ab-figure {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  border: var(--ab-rule);
  background: var(--panel);
  aspect-ratio: auto;
  overflow: hidden;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-figure .media-frame__caption {
  padding: 10px clamp(12px, 2vw, 16px);
  border-top: var(--ab-rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- team ---------- */
.page-about .ab-team {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-team__card {
  background: var(--panel);
  padding: clamp(16px, 2.2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-team__num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 40px;
  line-height: 1;
  color: var(--signal);
}

.page-about .ab-team__name {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- timeline ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--grid-strong);
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--signal);
}

.page-about .ab-timeline__phase {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-timeline__title {
  margin: 6px 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-timeline__item:hover .ab-timeline__title {
  color: var(--signal);
}

.page-about .ab-timeline__text {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- scope ---------- */
.page-about .ab-scope {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-scope .panel {
  background: var(--panel);
  padding: clamp(16px, 2.2vw, 24px);
  border: 0;
}

.page-about .ab-scope__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--signal);
}

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

.page-about .ab-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist-strong);
}

.page-about .ab-list li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  background: var(--cyan);
}

.page-about .ab-systems {
  list-style: none;
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-systems .tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- actions ---------- */
.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-actions .btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- contact ---------- */
.page-about .ab-contact {
  display: grid;
  gap: var(--ab-gap);
  margin-top: clamp(18px, 2.5vw, 26px);
}

.page-about .ab-contact__list {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .ab-contact__row {
  background: var(--panel);
  padding: 14px clamp(12px, 2vw, 18px);
  display: grid;
  gap: 4px;
}

.page-about .ab-contact__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .ab-contact__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
  min-width: 0;
}

.page-about .ab-contact__side {
  min-width: 0;
}

.page-about .ab-contact__note {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-contact__links {
  margin: clamp(16px, 2.5vw, 22px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .ab-contact__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- responsive ---------- */
@media (min-width: 600px) {
  .page-about .ab-contact__row {
    grid-template-columns: 104px minmax(0, 1fr);
    align-items: baseline;
  }

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

@media (min-width: 760px) {
  .page-about .ab-line {
    grid-template-columns: 56px minmax(0, 1fr);
    align-items: start;
    column-gap: 20px;
  }

  .page-about .ab-line__link {
    grid-column: 2;
  }

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

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

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
  }

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

  .page-about .ab-contact {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .ab-toc-col {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .ab-quote {
    margin-left: clamp(-24px, -2vw, 0px);
  }
}

@media (min-width: 1200px) {
  .page-about .ab-figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-timeline {
    border-left-color: var(--grid-strong);
  }
}
<<<END>>>