.page-about {
  --about-rail: 208px;
  background: var(--ink-950);
  color: var(--warm);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 44px) 0 40px;
  border-bottom: var(--line);
  background:
    radial-gradient(1100px 420px at 10% -12%, rgba(46, 139, 255, 0.20), transparent 70%),
    radial-gradient(860px 380px at 92% 2%, rgba(57, 255, 136, 0.12), transparent 74%),
    var(--ink-950);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(27, 42, 85, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 42, 85, 0.5) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 72%);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--steel);
}

.page-about .breadcrumbs__link {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-700);
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--pulse);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 30px;
  height: 1px;
  background: var(--pulse);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 9vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-hero__claim {
  max-width: 26ch;
  margin: 0 0 22px;
  padding-left: 16px;
  border-left: 2px solid var(--electric);
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 3.6vw, 1.45rem);
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 64ch;
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--warm);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 16px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: var(--line);
  list-style: none;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--pulse);
}

.page-about .about-facts__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--steel);
}

/* ---------- Body layout ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-bottom: 72px;
}

.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  margin-bottom: 26px;
  padding: 12px 0 10px;
  border-bottom: var(--line);
  background: rgba(7, 13, 28, 0.94);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

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

.page-about .about-toc {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

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

.page-about .about-toc__link {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 2px 8px;
  border-bottom: 2px solid transparent;
  color: var(--steel);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover {
  color: var(--warm);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--warm);
  border-bottom-color: var(--pulse);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--pulse);
  opacity: 0.8;
}

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

/* ---------- Section shell override ---------- */
.page-about .chapter {
  position: relative;
  display: block;
  margin: 0 0 46px;
  padding: 0 0 46px;
  border-bottom: var(--line);
}

.page-about .about-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .chapter__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--pulse);
}

.page-about .chapter__title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.45rem, 4.6vw, 2.05rem);
  line-height: 1.28;
  color: var(--warm);
}

.page-about .chapter__sub {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-section p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--warm);
}

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

.page-about .about-inline-link {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px dashed var(--ink-700);
  font-size: 14.5px;
  color: var(--steel);
}

.page-about .about-section a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 217, 255, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-section a:hover,
.page-about .about-section a:focus-visible {
  color: var(--pulse);
  border-bottom-color: var(--pulse);
}

/* ---------- 01 要点卡 ---------- */
.page-about .about-points {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 24px 0 0;
}

.page-about .about-point {
  padding: 18px 16px;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--ink-900);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-point:hover {
  transform: translateY(-2px);
  border-color: var(--electric);
}

.page-about .about-point__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--electric);
}

.page-about .about-point__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: 0.01em;
  color: var(--warm);
}

.page-about .about-point p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 02 流程图 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-step {
  border: var(--line);
  border-left: 3px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-900);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-step[open] {
  border-left-color: var(--pulse);
}

.page-about .about-step__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--warm);
}

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

.page-about .about-step__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--electric);
}

.page-about .about-step[open] .about-step__head::after {
  content: "–";
  color: var(--pulse);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .about-step__body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 媒体块 ---------- */
.page-about .media {
  margin: 22px 0 24px;
}

.page-about .about-media .media__frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-evo .media__frame {
  aspect-ratio: 2 / 1;
}

.page-about .about-coverage__media .media__frame {
  aspect-ratio: 3 / 4;
}

.page-about .media__frame {
  position: relative;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--ink-900), var(--ink-800));
}

.page-about .media__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* ---------- 03 演进展览带 ---------- */
.page-about .about-track {
  margin: 24px 0 4px;
}

.page-about .about-track__list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 4px 4px 20px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
}

.page-about .about-track__list::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-track__list::-webkit-scrollbar-track {
  background: var(--ink-900);
  border-radius: 3px;
}

.page-about .about-track__list::-webkit-scrollbar-thumb {
  background: var(--ink-700);
  border-radius: 3px;
}

.page-about .about-track__item {
  flex: 0 0 234px;
  scroll-snap-align: start;
  padding: 18px 16px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink-950);
  box-shadow:
    6px 6px 0 -3px rgba(46, 139, 255, 0.35),
    12px 12px 0 -6px rgba(57, 255, 136, 0.22);
}

.page-about .about-track__year {
  display: block;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(7, 13, 28, 0.18);
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--ink-950);
}

.page-about .about-track__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink-950);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.66;
  color: #22304f;
}

/* ---------- 04 赛事覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

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

.page-about .about-disciplines {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .about-disciplines li {
  padding: 5px 11px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-rel {
  margin: 24px 0 24px;
  padding: 20px 18px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(46, 139, 255, 0.10), rgba(57, 255, 136, 0.05) 60%, transparent);
}

.page-about .about-rel__hub {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 20px;
  border: 1px solid var(--electric);
  border-radius: var(--radius);
  background: rgba(46, 139, 255, 0.14);
}

.page-about .about-rel__hub-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  color: var(--warm);
}

.page-about .about-rel__hub-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-rel__nodes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 18px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ink-700);
  list-style: none;
}

.page-about .about-rel__node {
  padding: 16px;
  border: var(--line);
  border-top: 2px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-900);
  transition: transform var(--dur) var(--ease), border-top-color var(--dur) var(--ease);
}

.page-about .about-rel__node--data {
  border-top-color: var(--pulse);
}

.page-about .about-rel__node--content {
  border-top-color: var(--electric);
}

.page-about .about-rel__node:hover {
  transform: translateY(-2px);
}

.page-about .about-rel__count {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--pulse);
}

.page-about .about-rel__node--content .about-rel__count {
  color: var(--mist);
}

.page-about .about-rel__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--warm);
}

.page-about .about-rel__node p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 06 数字与 CTA ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .about-numbers li {
  padding: 20px 16px;
  background: var(--ink-950);
}

.page-about .about-numbers__value {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4.6vw, 1.85rem);
  line-height: 1.1;
  color: var(--warm);
}

.page-about .about-numbers__value em {
  font-style: normal;
  color: var(--pulse);
}

.page-about .about-numbers__label {
  display: block;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--steel);
}

.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 26px;
  padding: 22px 20px;
  border: 1px dashed var(--ink-700);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(46, 139, 255, 0.12), rgba(57, 255, 136, 0.06));
}

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

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 700px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-cta p {
    max-width: 58ch;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 62px) 0 54px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 52px;
    padding-top: 52px;
  }

  .page-about .about-rail {
    top: calc(var(--header-h) + 28px);
    align-self: start;
    margin-bottom: 0;
    padding: 0;
    border-bottom: 0;
    background: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .page-about .about-rail__label {
    display: block;
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--steel);
  }

  .page-about .about-toc {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    width: 100%;
    padding: 8px 0 8px 12px;
    border-bottom: 0;
    border-left: 2px solid var(--ink-700);
    white-space: normal;
  }

  .page-about .about-toc__link[aria-current="true"] {
    border-left-color: var(--pulse);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .chapter {
    margin-bottom: 56px;
    padding-bottom: 56px;
  }
}
<<<END>>>