.page-about {
  position: relative;
  background-color: var(--color-surface);
  color: var(--color-ink);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(72% 38% at 8% 4%, color-mix(in srgb, var(--color-primary) 16%, transparent), transparent 66%),
    radial-gradient(58% 34% at 96% 18%, color-mix(in srgb, var(--color-accent) 12%, transparent), transparent 64%),
    radial-gradient(80% 40% at 50% 62%, color-mix(in srgb, var(--color-primary) 8%, transparent), transparent 72%),
    radial-gradient(70% 40% at 20% 100%, color-mix(in srgb, var(--color-accent) 9%, transparent), transparent 66%);
}

.page-about > * {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏上下文 ---------- */
.page-about .about-head {
  padding-block: var(--space-6) var(--space-2);
}

.page-about .about-head__intro {
  margin-top: var(--space-6);
  max-width: var(--measure);
}

.page-about .about-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-about .about-head__eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
}

.page-about .about-head h1 {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-head .lede {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 章节 01 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 82%, transparent);
  background: color-mix(in srgb, var(--color-surface) 74%, transparent);
  backdrop-filter: blur(14px);
}

.page-about .about-chapter__side {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.page-about .chapnum {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--color-primary);
  opacity: 0.34;
}

.page-about .about-chapter__kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-about .about-chapter__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-chapter__body .prose p {
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

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

/* ---------- 章节头部通用 ---------- */
.page-about .about-section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-about .about-section-head .section-title {
  margin: 0 0 var(--space-2);
}

.page-about .about-section-head .lede {
  max-width: 62ch;
  margin: 0;
  color: var(--color-ink-soft);
}

/* ---------- 阶段轴 ---------- */
.page-about .stage-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .stage-axis__item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 78%, transparent);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  backdrop-filter: blur(12px);
  scroll-margin-top: 108px;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .stage-axis__item:hover {
  border-color: var(--color-primary);
}

.page-about .stage-axis__item:target {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 34%, var(--color-surface));
}

.page-about .stage-axis__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 180ms ease;
}

.page-about .stage-axis__num:hover,
.page-about .stage-axis__item:target .stage-axis__num {
  color: var(--color-accent);
}

.page-about .stage-axis__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .stage-axis__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-about .stage-axis__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  margin: var(--space-3) 0 0;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 42%, transparent);
  background: color-mix(in srgb, var(--color-highlight) 62%, transparent);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-about .stage-axis__stat .mono {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
}

.page-about .stage-axis__main .figure {
  margin: var(--space-4) 0 0;
}

/* ---------- 团队 ---------- */
.page-about .team-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-about .team-roster__item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 80%, transparent);
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  backdrop-filter: blur(10px);
  transition: border-color 180ms ease;
}

.page-about .team-roster__item:hover {
  border-color: var(--color-primary);
}

.page-about .team-roster__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}

.page-about .team-roster__role {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .team-roster__text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ---------- 赛区协作 ---------- */
.page-about .region-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-about .region-grid__item {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 78%, transparent);
  background: color-mix(in srgb, var(--color-surface) 76%, transparent);
  backdrop-filter: blur(12px);
}

.page-about .region-grid__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
}

.page-about .region-grid__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .region-grid__item p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .region-note {
  margin: var(--space-6) 0 0;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-accent);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ---------- 现状数字 ---------- */
.page-about .now-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
}

.page-about .now-grid__cell {
  display: grid;
  gap: 6px;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-line) 80%, transparent);
  background: color-mix(in srgb, var(--color-surface) 80%, transparent);
  backdrop-filter: blur(10px);
  transition: border-color 180ms ease;
}

.page-about .now-grid__cell:hover {
  border-color: var(--color-accent);
}

.page-about .now-grid__label {
  order: 2;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-about .now-grid__value {
  order: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-about .now-grid__value small {
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  margin-left: 0.25em;
  color: var(--color-ink-soft);
}

.page-about .now-note {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-about .now-note a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 180ms ease;
}

.page-about .now-note a:hover {
  color: var(--color-accent);
}

/* ---------- 收口 ---------- */
.page-about .about-outro {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-outro__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-outro__copy p {
  margin: 0;
  max-width: 58ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-section-head {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: var(--space-4);
  }

  .page-about .stage-axis__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
    padding: var(--space-4) var(--space-4) var(--space-4) var(--space-3);
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: var(--space-6);
    padding: var(--space-6);
  }

  .page-about .about-outro {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
    gap: var(--space-8);
  }

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

  .page-about .about-chapter__side {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

@media (min-width: 1080px) {
  .page-about .team-roster {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-3);
  }
}

@media (max-width: 640px) {
  .page-about .about-head h1 {
    font-size: var(--text-2xl);
  }

  .page-about .chapnum,
  .page-about .stage-axis__num {
    font-size: var(--text-3xl);
  }

  .page-about .now-grid {
    grid-template-columns: 1fr;
  }

  .page-about .about-outro__actions .btn {
    flex: 1 1 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage-axis__item,
  .page-about .stage-axis__num,
  .page-about .team-roster__item,
  .page-about .now-grid__cell,
  .page-about .now-note a {
    transition: none;
  }
}
<<<END>>>