.page-about {
  --about-gap: clamp(44px, 6.5vw, 88px);
  --about-line: rgba(143, 163, 181, .22);
  --about-panel: var(--panel);
  --about-radius: var(--r-md);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  padding: 18px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
.page-about .breadcrumb__item {
  color: var(--muted);
  text-decoration: none;
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  opacity: .45;
}
.page-about .breadcrumb__item[aria-current] {
  color: var(--gold);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: var(--about-gap) 0 0;
  overflow: hidden;
}
.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}
.page-about .hero-copy {
  max-width: 100%;
}
.page-about .hero-copy .mono-label {
  display: block;
  margin-bottom: 16px;
  color: var(--gold);
}
.page-about .hero-copy h1 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 0 0 20px;
  color: var(--white);
}
.page-about .hero-lead {
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 28px;
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .hero-visual {
  margin: 0;
}
.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  filter: saturate(.82) brightness(.9) contrast(1.06);
  object-fit: cover;
}
.page-about .hero-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
.page-about .hero-divider {
  margin-top: var(--about-gap);
  height: 1px;
  background: var(--line-gold);
  border: 0;
}

/* 关键数字 */
.page-about .about-metrics {
  padding: var(--about-gap) 0;
}
.page-about .metrics-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.page-about .metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 20px;
  background: var(--about-panel);
  border-radius: var(--about-radius);
  border: 1px solid var(--about-line);
}
.page-about .metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 5vw, 58px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold-lite);
  letter-spacing: -.02em;
}
.page-about .metric__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--muted);
  text-transform: uppercase;
}
.page-about .metric__desc {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  opacity: .85;
}

/* 斜向分割 */
.page-about .slash-bleed {
  width: 100%;
  height: 52px;
  background: linear-gradient(168deg, transparent 0 42%, var(--slate) 42% 58%, transparent 58%);
  opacity: .55;
  margin: 0 0 calc(var(--about-gap) * -.4);
  pointer-events: none;
}

/* 三线归置 */
.page-about .about-system {
  padding: var(--about-gap) 0;
}
.page-about .section-head {
  margin-bottom: 36px;
  max-width: 720px;
}
.page-about .section-head--left {
  margin-bottom: 28px;
}
.page-about .section-head .mono-label {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
}
.page-about .section-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--white);
  margin: 0 0 16px;
}
.page-about .section-desc {
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0;
}
.page-about .track-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .track {
  position: relative;
  padding: 28px 24px 24px;
  border-radius: var(--about-radius);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--gold);
}
.page-about .track--cup {
  border-left-color: var(--yellow);
}
.page-about .track--continental {
  border-left-color: var(--magenta);
}
.page-about .track-tag {
  display: inline-block;
  margin-bottom: 14px;
}
.page-about .track-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--white);
  margin: 0 0 10px;
}
.page-about .track-text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0 0 16px;
}
.page-about .track-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .track-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
  opacity: .82;
}
.page-about .track-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}
.page-about .track--cup .track-list li::before {
  background: var(--yellow);
}
.page-about .track--continental .track-list li::before {
  background: var(--magenta);
}
.page-about .system-visual {
  margin: 32px 0 0;
}
.page-about .system-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  filter: saturate(.8) brightness(.9);
  object-fit: cover;
}
.page-about .system-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* 团队 */
.page-about .about-team {
  padding: var(--about-gap) 0;
}
.page-about .team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}
.page-about .roles {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.page-about .role {
  display: flex;
  gap: 16px;
  padding: 22px 20px;
  border-radius: var(--about-radius);
  background: var(--slate);
  border: 1px solid var(--line-soft);
}
.page-about .role-index {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
  padding-top: 3px;
}
.page-about .role-name {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
  margin: 0 0 8px;
}
.page-about .role-text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
  margin: 0;
}
.page-about .team-visual {
  margin: 0;
}
.page-about .team-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  filter: saturate(.78) brightness(.88) contrast(1.04);
  object-fit: cover;
}
.page-about .team-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* 合作与发展 */
.page-about .about-growth {
  padding: var(--about-gap) 0 calc(var(--about-gap) * .6);
}
.page-about .growth-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}
.page-about .growth-copy .mono-label {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
}
.page-about .growth-copy .section-title {
  margin-bottom: 18px;
}
.page-about .growth-lead {
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
  margin: 0 0 28px;
}
.page-about .growth-facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .fact {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 18px 20px;
  border-radius: var(--about-radius);
  border-left: 3px solid var(--gold);
  background: var(--ink-deep);
}
.page-about .fact-num {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold);
}
.page-about .fact-desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--white);
  opacity: .85;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .metrics-row {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .page-about .growth-facts {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 1.45fr 1fr;
    gap: 44px;
  }
  .page-about .track-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .track--continental {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 32px;
    align-items: start;
  }
  .page-about .track--continental .track-tag {
    grid-column: 1 / -1;
  }
  .page-about .team-layout {
    grid-template-columns: 1.5fr 1fr;
    gap: 48px;
  }
  .page-about .growth-layout {
    grid-template-columns: 1.35fr 1fr;
    gap: 52px;
  }
}

@media (min-width: 1100px) {
  .page-about .track-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .track--continental {
    display: block;
    grid-column: auto;
  }
  .page-about .hero-grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transition: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}
</main>