.page-about {
  --ab-rail: 96px;
  background: var(--space-blue);
  color: var(--paper);
}

.page-about .ab-hero {
  padding: clamp(16px, 3vw, 28px) 0 clamp(32px, 5vw, 56px);
  border-bottom: var(--line);
  background:
    linear-gradient(160deg, rgba(22, 74, 138, 0.55) 0%, rgba(6, 20, 40, 0) 62%),
    var(--space-blue);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .ab-hero__copy h1 {
  margin: 10px 0 16px;
  font-size: clamp(34px, 6.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 900;
}

.page-about .ab-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
}

.page-about .ab-facts li {
  border-left: 2px solid var(--cyan);
  padding-left: 10px;
}

.page-about .ab-facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .ab-facts span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-layout {
  display: block;
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-rail {
  margin-bottom: 24px;
  border-bottom: var(--line-soft);
  padding-bottom: 14px;
}

.page-about .ab-rail__title {
  margin: 0 0 10px;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .ab-rail__list a {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  border: var(--line-soft);
  padding: 6px 12px;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  color: var(--space-blue);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .ab-sec {
  padding: clamp(20px, 3vw, 32px) 0;
}

.page-about .ab-sec__head {
  max-width: 720px;
  margin-bottom: 24px;
}

.page-about .ab-sec h2 {
  margin: 8px 0 12px;
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 900;
}

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

.page-about .ab-slant {
  height: 26px;
  margin: clamp(20px, 4vw, 40px) 0;
  background: repeating-linear-gradient(-12deg, var(--arena-blue) 0 2px, transparent 2px 13px);
  opacity: 0.55;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-node {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 0 22px 22px;
  border-left: var(--line);
  scroll-margin-top: 140px;
  transition: background 220ms var(--ease);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 26px;
  width: 14px;
  height: 14px;
  background: var(--cyan);
  box-shadow: var(--shadow-soft);
  transition: background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-node:target {
  background: linear-gradient(90deg, rgba(59, 240, 220, 0.13), rgba(59, 240, 220, 0) 72%);
}

.page-about .ab-node:target::before {
  background: var(--orange);
  transform: scale(1.15);
}

.page-about .ab-node__year {
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .ab-node__body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
}

.page-about .ab-node__body p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-node__result {
  border-left: 3px solid var(--gold);
  padding-left: 12px;
  color: var(--paper) !important;
  font-size: 14px !important;
}

.page-about .ab-venues__media {
  margin: 0 0 22px;
  border: var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-table-wrap {
  overflow-x: auto;
  border: var(--line);
  box-shadow: var(--shadow-hard);
  background: var(--night-blue);
}

.page-about .ab-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .ab-table__cap {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
  border-bottom: var(--line);
}

.page-about .ab-table thead th {
  text-align: left;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--mist);
  border-bottom: var(--line);
  white-space: nowrap;
}

.page-about .ab-table td,
.page-about .ab-table tbody th {
  padding: 13px 14px;
  border-bottom: var(--line-soft);
  text-align: left;
  vertical-align: top;
  font-weight: 400;
  color: var(--paper);
}

.page-about .ab-table tbody tr:last-child td,
.page-about .ab-table tbody tr:last-child th {
  border-bottom: 0;
}

.page-about .ab-table tbody tr {
  transition: background 180ms var(--ease);
}

.page-about .ab-table tbody tr:hover {
  background: rgba(22, 74, 138, 0.42);
}

.page-about .ab-table tbody tr:hover th:first-child {
  box-shadow: inset 4px 0 0 var(--cyan);
}

.page-about .ab-table tbody tr td:nth-child(4) {
  color: var(--mist);
  transition: color 180ms var(--ease);
}

.page-about .ab-table tbody tr:hover td:nth-child(4) {
  color: var(--cyan);
}

.page-about .ab-city {
  color: var(--gold) !important;
  font-weight: 700 !important;
  white-space: nowrap;
}

.page-about .ab-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-event {
  display: grid;
  gap: 22px;
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 12px;
}

.page-about .ab-steps li {
  position: relative;
  padding: 16px 16px 16px 62px;
  background: var(--night-blue);
  border: var(--line-soft);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-steps li:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .ab-steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 16px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--orange);
}

.page-about .ab-steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
  line-height: 1.3;
}

.page-about .ab-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-event__media {
  margin: 0;
  border: var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-refbox {
  display: grid;
  gap: 14px;
  margin-top: 22px;
  padding: 18px;
  border: var(--line);
  background: linear-gradient(120deg, rgba(22, 74, 138, 0.6), rgba(6, 20, 40, 0.2));
}

.page-about .ab-refbox__num {
  font-size: 44px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .ab-refbox h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .ab-refbox p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-sec--narrow {
  max-width: 720px;
}

.page-about .ab-donut-wrap {
  display: grid;
  gap: 18px;
  justify-items: start;
  margin-bottom: 26px;
}

.page-about .ab-donut {
  width: 176px;
  height: 176px;
  display: block;
}

.page-about .ab-donut__seg {
  transition: stroke-width 180ms var(--ease), opacity 180ms var(--ease);
}

.page-about .ab-donut:hover .ab-donut__seg {
  stroke-width: 18;
}

.page-about .ab-donut__num {
  font-family: var(--font-mono);
  font-size: 24px;
  fill: var(--paper);
  letter-spacing: 0.04em;
}

.page-about .ab-donut__cap {
  font-family: var(--font-mono);
  font-size: 7px;
  letter-spacing: 0.16em;
  fill: var(--mist);
}

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

.page-about .ab-legend li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-legend strong {
  color: var(--paper);
  font-size: 18px;
}

.page-about .ab-legend__sw {
  width: 12px;
  height: 12px;
  flex: none;
  border: 1px solid var(--ink);
}

.page-about .ab-legend__sw--cyan {
  background: var(--cyan);
}

.page-about .ab-legend__sw--blue {
  background: var(--arena-blue);
}

.page-about .ab-tracks {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .ab-tracks li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 12px;
  border: var(--line-soft);
  font-size: 15px;
  font-weight: 600;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-about .ab-tracks .mono {
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.1em;
}

.page-about .ab-copy {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

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

.page-about .ab-ops li {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  border-left: 4px solid var(--arena-blue);
  background: var(--night-blue);
}

.page-about .ab-ops b {
  font-size: 18px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .ab-ops span {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-eco {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .ab-eco__card {
  padding: 16px 18px;
  background: var(--night-blue);
  border: var(--line-soft);
  border-top: 3px solid var(--gold);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-eco__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-mid);
  border-color: var(--cyan);
  border-top-color: var(--orange);
}

.page-about .ab-eco__num {
  margin: 0 0 6px;
  font-size: 32px;
  line-height: 1;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .ab-eco__card h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .ab-eco__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 26px;
  background: var(--line-soft);
  border: var(--line);
}

.page-about .ab-partners__stat {
  background: var(--space-blue);
  padding: 16px 14px;
}

.page-about .ab-partners__stat p {
  margin: 0 0 4px;
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .ab-partners__stat span {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-details-grid {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .ab-details {
  border: var(--line-soft);
  background: var(--night-blue);
}

.page-about .ab-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  border-left: 4px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

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

.page-about .ab-details summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-details[open] summary {
  border-left-color: var(--cyan);
  border-bottom: var(--line-soft);
  color: var(--cyan);
}

.page-about .ab-details[open] summary::after {
  content: "−";
}

.page-about .ab-details summary:hover {
  border-left-color: var(--orange);
}

.page-about .ab-details ul {
  margin: 0;
  padding: 14px 18px 16px 32px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-cta {
  border-top: var(--line);
  background:
    linear-gradient(120deg, rgba(255, 107, 34, 0.14), rgba(6, 20, 40, 0) 60%),
    var(--night-blue);
  padding: clamp(28px, 5vw, 52px) 0;
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .ab-cta h2 {
  margin: 8px 0 8px;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .ab-cta p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

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

@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-donut-wrap {
    grid-template-columns: 176px minmax(0, 1fr);
    align-items: center;
    justify-items: start;
  }

  .page-about .ab-refbox {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: start;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .ab-event {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-layout {
    display: grid;
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 40px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 110px;
    align-self: start;
    margin-bottom: 0;
    border-bottom: 0;
    border-right: var(--line-soft);
    padding: 4px 12px 4px 0;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 12px;
    overflow: visible;
  }

  .page-about .ab-rail__list a {
    border: 0;
    padding: 0 0 0 16px;
    position: relative;
    font-size: 14px;
    background: none;
  }

  .page-about .ab-rail__list a::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 8px;
    height: 8px;
    transform: translateY(-50%);
    background: var(--arena-blue);
    transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
  }

  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    color: var(--cyan);
    background: none;
  }

  .page-about .ab-rail__list a:hover::before,
  .page-about .ab-rail__list a:focus-visible::before {
    background: var(--cyan);
    box-shadow: 0 0 0 3px rgba(59, 240, 220, 0.22);
  }

  .page-about .ab-node {
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: 26px;
    padding: 28px 0 28px 30px;
  }

  .page-about .ab-node__year {
    font-size: 42px;
    line-height: 0.95;
  }

  .page-about .ab-node__body p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node::before,
  .page-about .ab-steps li,
  .page-about .ab-eco__card,
  .page-about .ab-donut__seg,
  .page-about .ab-table tbody tr {
    transition: none;
  }

  .page-about .ab-steps li:hover,
  .page-about .ab-eco__card:hover {
    transform: none;
  }
}
<<<END>>>