.page-about {
  --about-gap: clamp(52px, 8vw, 104px);
  --about-card: rgba(15, 42, 59, 0.62);
  color: var(--mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-lead {
  padding: calc(var(--header-h) + 52px) 0 38px;
  background:
    radial-gradient(90% 120% at 88% -12%, rgba(31, 227, 208, 0.16), transparent 60%),
    radial-gradient(70% 90% at 2% 8%, rgba(58, 43, 98, 0.5), transparent 66%),
    linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 80%);
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 22px;
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--neon);
  border-color: var(--line-neon);
}

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--neon);
}

.page-about .about-lead .eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 14px;
}

.page-about .about-lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 18em;
}

.page-about .about-lede {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(233, 242, 246, 0.82);
  max-width: 42em;
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-stat {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 5vw, 30px);
  font-weight: 500;
  color: var(--neon);
  line-height: 1.1;
}

.page-about .about-stat-num--gold {
  color: var(--gold);
}

.page-about .about-stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 章节目录 ---------- */
.page-about .chapter-nav {
  background: rgba(8, 26, 38, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.page-about .chapter-nav ul {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 12px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .chapter-nav ul::-webkit-scrollbar {
  display: none;
}

.page-about .chapter-nav a {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .chapter-nav a:hover,
.page-about .chapter-nav a[aria-current="true"] {
  color: var(--ink);
  background: var(--neon);
  border-color: var(--neon);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-section {
  padding: var(--about-gap) 0;
}

.page-about .about-section--timeline {
  background: linear-gradient(180deg, rgba(11, 48, 56, 0.92) 0%, rgba(8, 26, 38, 0.25) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section--sources {
  padding-top: clamp(40px, 6vw, 72px);
}

.page-about .about-section--next {
  padding-bottom: clamp(64px, 9vw, 118px);
}

.page-about .about-head {
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  padding: clamp(22px, 4vw, 36px);
  background: linear-gradient(140deg, var(--slate) 0%, rgba(8, 26, 38, 0.4) 100%);
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .about-head--indigo {
  background: linear-gradient(140deg, var(--indigo) 0%, rgba(8, 26, 38, 0.45) 100%);
}

.page-about .about-head--wine {
  background: linear-gradient(140deg, var(--wine) 0%, rgba(8, 26, 38, 0.5) 100%);
}

.page-about .about-head .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .about-head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.6vw, 36px);
  line-height: 1.24;
  margin: 0 0 12px;
  max-width: 22em;
}

.page-about .about-head-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 46em;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(233, 242, 246, 0.82);
  max-width: 40em;
}

/* ---------- 团队分工 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 24px;
  margin-bottom: 28px;
}

.page-about .about-fig {
  margin: 0;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

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

.page-about .about-fig--43 {
  aspect-ratio: 4 / 3;
}

.page-about .about-fig--34 {
  aspect-ratio: 3 / 4;
}

.page-about .team-grid {
  display: grid;
  gap: 14px;
}

.page-about .team-col {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--about-card);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease), background 160ms var(--ease);
}

.page-about .team-col::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 3px;
  border-radius: var(--r-pill);
  background: var(--neon);
}

.page-about .team-col--data::before {
  background: var(--gold);
}

.page-about .team-col--guide::before {
  background: linear-gradient(90deg, var(--indigo), var(--neon-deep));
}

.page-about .team-col:hover {
  border-color: var(--line-neon);
  background: rgba(31, 227, 208, 0.06);
  transform: translateY(-3px);
}

.page-about .team-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--neon);
}

.page-about .team-col h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  margin: 0;
}

.page-about .team-col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 结构迭代时间线 ---------- */
.page-about .timeline-layout {
  display: grid;
  gap: 32px;
}

.page-about .about-steps {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0 0;
}

.page-about .about-steps::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 24px;
  border-left: 1px dashed var(--line-neon);
}

.page-about .about-step {
  position: relative;
  padding: 0 0 26px 48px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: var(--r-pill);
  background: var(--ink);
  border: 2px solid var(--neon-deep);
  transition: background 160ms var(--ease), border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.page-about .about-step:hover::before,
.page-about .about-step.is-active::before {
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 0 0 5px rgba(31, 227, 208, 0.15);
}

.page-about .about-step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--gold);
  border: 1px solid var(--line-gold);
  border-radius: var(--r-pill);
  padding: 2px 10px;
  margin-bottom: 10px;
}

.page-about .about-step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 38em;
}

/* ---------- 复核节奏 ---------- */
.page-about .about-review {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid rgba(31, 227, 208, 0.18);
  padding: clamp(24px, 5vw, 48px);
  background: linear-gradient(155deg, rgba(58, 43, 98, 0.95) 0%, rgba(8, 26, 38, 0.92) 88%);
}

.page-about .about-review-texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.14;
  pointer-events: none;
}

.page-about .about-review > *:not(.about-review-texture) {
  position: relative;
  z-index: 1;
}

.page-about .about-review .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .about-review h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 4.6vw, 34px);
  line-height: 1.24;
  margin: 0 0 14px;
}

.page-about .about-review-copy {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(233, 242, 246, 0.84);
  max-width: 44em;
}

.page-about .about-ruler {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-ruler li {
  border: 1px dashed var(--line-neon);
  border-radius: var(--r-sm);
  padding: 13px 14px;
  background: rgba(8, 26, 38, 0.4);
}

.page-about .about-ruler strong {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 500;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .about-ruler span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 使用场景 ---------- */
.page-about .about-players {
  border-top: 1px solid var(--line);
}

.page-about .about-player {
  display: grid;
  gap: 12px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-player-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  color: var(--neon);
  line-height: 1.2;
}

.page-about .about-player h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  margin: 0 0 8px;
}

.page-about .about-player p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(233, 242, 246, 0.82);
}

.page-about .about-player a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-neon);
}

.page-about .about-player a:hover {
  color: var(--mist);
  border-color: var(--mist);
}

.page-about .about-player-path {
  border-left: 2px solid var(--line-gold);
  padding-left: 14px;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 内容来源 ---------- */
.page-about .about-sources {
  display: grid;
  gap: 14px;
}

.page-about .about-source {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--about-card);
  padding: 20px 18px;
}

.page-about .about-source-tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--neon);
  border: 1px solid var(--line-neon);
  border-radius: var(--r-pill);
  padding: 3px 12px;
  margin-bottom: 12px;
}

.page-about .about-source-tag--gold {
  color: var(--gold);
  border-color: var(--line-gold);
}

.page-about .about-source p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-sources-note {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(233, 242, 246, 0.82);
  max-width: 44em;
}

.page-about .about-sources-note a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line-neon);
}

.page-about .about-sources-note a:hover {
  color: var(--mist);
  border-color: var(--mist);
}

/* ---------- 路径入口 ---------- */
.page-about .about-path {
  display: grid;
  gap: 16px;
}

.page-about .about-path-step {
  position: relative;
  display: block;
  padding: 24px 20px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(15, 42, 59, 0.5);
  color: var(--mist);
  text-decoration: none;
  transition: border-color 160ms var(--ease), background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-path-step:hover {
  border-color: var(--line-neon);
  background: rgba(31, 227, 208, 0.08);
  transform: translateY(-3px);
}

.page-about .about-path-step .step-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .about-path-step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about .about-path-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-sources {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .team-layout {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: center;
    gap: 44px;
  }

  .page-about .team-grid {
    grid-template-columns: 0.9fr 1fr 1.2fr;
    gap: 18px;
    align-items: stretch;
  }

  .page-about .timeline-layout {
    grid-template-columns: 1.35fr 0.65fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-steps::before {
    left: 15px;
  }

  .page-about .about-player {
    grid-template-columns: 64px 1.3fr 1fr;
    gap: 28px;
    align-items: start;
    padding: 28px 0;
  }

  .page-about .about-player-path {
    margin: 0;
  }

  .page-about .about-path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .about-path-step::before {
    content: "";
    position: absolute;
    top: -16px;
    left: 30px;
    height: 16px;
    border-left: 1px dashed var(--line-neon);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-col,
  .page-about .about-path-step,
  .page-about .about-step::before,
  .page-about .about-fig img {
    transition: none;
  }

  .page-about .team-col:hover,
  .page-about .about-path-step:hover {
    transform: none;
  }
}