.page-about {
  --about-cell: rgba(23, 63, 53, 0.55);
  --about-ghost: rgba(143, 168, 184, 0.32);
  --about-gap: clamp(22px, 3.4vw, 40px);
  position: relative;
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: clip;
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .inline-link {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 122, 0.4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .inline-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

/* ---------- 顶部区域 ---------- */
.page-about .about-top {
  position: relative;
  padding: clamp(16px, 3vw, 32px) var(--gutter) clamp(30px, 5vw, 60px);
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(120% 80% at 82% -10%, rgba(255, 107, 26, 0.16), transparent 60%),
    radial-gradient(90% 70% at 10% 0%, rgba(61, 224, 174, 0.08), transparent 65%);
  overflow: hidden;
}

.page-about .about-top::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(201, 214, 221, 0.05) 0,
    rgba(201, 214, 221, 0.05) 1px,
    transparent 1px,
    transparent 4px
  );
  pointer-events: none;
  opacity: 0.5;
}

.page-about .about-top .breadcrumbs {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-about .about-top .breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-top .breadcrumbs a:hover,
.page-about .about-top .breadcrumbs a:focus-visible {
  color: var(--orange-soft);
}

.page-about .crumb-sep {
  color: var(--grid);
}

.page-about .about-hero {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: end;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--orange);
  border-left: 2px solid var(--orange);
  padding-left: 10px;
}

.page-about .hero-copy h1 {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-family: var(--font-display);
  font-size: clamp(32px, 6.2vw, 76px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .hero-lead {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  max-width: 46ch;
  color: var(--mist);
}

.page-about .hero-meta {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 13px;
  color: var(--slate);
}

.page-about .hero-meta li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .hero-meta .data-num {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.02em;
}

.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

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

.page-about .fig-hero {
  aspect-ratio: 16 / 9;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.85);
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(24px, 4vw, 52px) var(--gutter) 0;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-index {
  border: 1px solid var(--grid);
  background: rgba(14, 42, 36, 0.6);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  padding: 12px 10px 14px;
}

.page-about .about-index-head {
  margin: 0 0 10px;
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--slate);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  white-space: nowrap;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--paper);
  border-left-color: var(--orange);
  background: var(--about-cell);
}

.page-about .about-index-link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -2px;
}

.page-about .idx-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
}

.page-about .about-body {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 66px);
}

.page-about .about-sec {
  position: relative;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--grid);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 68px;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--brown));
}

.page-about .sec-head {
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .chapter-coord {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 48px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--about-ghost);
}

.page-about .section-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--fs-section);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 20em;
}

.page-about .sec-lead {
  margin: 0;
  max-width: 58ch;
  color: var(--slate);
}

.page-about .sec-body {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 66ch;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 10px;
  left: 9px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange), var(--pine) 55%, var(--grid));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 32px) 32px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 26, 0.14);
  transition: box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item:hover::before {
  background: var(--orange-soft);
  box-shadow: 0 0 0 7px rgba(255, 107, 26, 0.18);
}

.page-about .tl-item--now::before {
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(61, 224, 174, 0.16);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--orange);
  margin-bottom: 4px;
}

.page-about .tl-item--now .tl-year {
  color: var(--mint);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: var(--slate);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-text {
  color: var(--mist);
}

/* ---------- 赛事图例网格 ---------- */
.page-about .legend-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .legend-cell {
  background: var(--panel);
  padding: 14px 14px 16px;
  display: grid;
  gap: 4px;
  transition: background var(--dur) var(--ease);
}

.page-about .legend-cell:hover {
  background: var(--pine);
}

.page-about .legend-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
}

.page-about .legend-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .legend-text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .stat-row {
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .stat-item {
  background: rgba(14, 42, 36, 0.75);
  padding: 14px 16px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-label {
  font-size: 13px;
  color: var(--slate);
  line-height: 1.55;
}

/* ---------- 内容生产 ---------- */
.page-about .prod-layout {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  align-items: start;
}

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

.page-about .prod-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--paper);
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .role-list li {
  position: relative;
  padding: 12px 14px 12px 16px;
  background: rgba(23, 63, 53, 0.42);
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role-list li:hover {
  background: var(--pine);
  border-left-color: var(--orange-soft);
}

.page-about .role-list strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
  margin-bottom: 3px;
}

/* ---------- 团队与服务区域 ---------- */
.page-about .team-bar {
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .team-band {
  list-style: none;
  display: flex;
  gap: 2px;
  height: 14px;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .band-seg {
  height: 100%;
  transition: transform var(--dur) var(--ease), filter var(--dur) var(--ease);
}

.page-about .band-seg--edit {
  flex: 28 1 0;
  background: var(--orange);
}

.page-about .band-seg--data {
  flex: 12 1 0;
  background: var(--orange-soft);
}

.page-about .band-seg--audit {
  flex: 6 1 0;
  background: var(--mint);
}

.page-about .band-seg:hover {
  transform: translateY(-3px);
  filter: brightness(1.15);
}

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

.page-about .band-legend-item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  font-size: 13px;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .band-legend-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper);
  margin-bottom: 2px;
}

.page-about .band-swatch {
  width: 10px;
  height: 10px;
  margin-top: 6px;
}

.page-about .band-swatch--edit {
  background: var(--orange);
}

.page-about .band-swatch--data {
  background: var(--orange-soft);
}

.page-about .band-swatch--audit {
  background: var(--mint);
}

.page-about .team-visual {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .fig-crowd {
  aspect-ratio: 3 / 2;
}

/* ---------- 合作 ---------- */
.page-about .coop-map {
  display: grid;
  gap: 18px;
  padding: clamp(18px, 3vw, 28px);
  background: rgba(14, 42, 36, 0.72);
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .coop-core {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: linear-gradient(135deg, rgba(255, 107, 26, 0.22), rgba(90, 42, 18, 0.35));
  border-left: 3px solid var(--orange);
}

.page-about .coop-core-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--paper);
}

.page-about .coop-core-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange-soft);
}

.page-about .coop-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .coop-nodes li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .coop-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--mint);
  min-width: 2.2ch;
  font-variant-numeric: tabular-nums;
}

.page-about .coop-label {
  min-width: 0;
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(24px, 4vw, 40px);
  background:
    linear-gradient(120deg, rgba(255, 107, 26, 0.16), rgba(14, 42, 36, 0.9) 55%),
    var(--panel);
  border: 1px solid var(--grid);
  border-top: 3px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-cta .section-title {
  font-size: clamp(24px, 3.4vw, 40px);
  margin-bottom: 10px;
}

.page-about .cta-text {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 58ch;
  color: var(--mist);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

  .page-about .stat-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (min-width: 720px) {
  .page-about .tl-item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 18px;
    padding-left: 34px;
  }

  .page-about .tl-item::before {
    top: 12px;
  }

  .page-about .prod-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .coop-map {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    align-items: center;
    gap: 24px;
  }

  .page-about .coop-nodes {
    border-left: 1px dashed var(--grid);
    padding-left: 22px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-shell {
    grid-template-columns: minmax(184px, 220px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .about-index-list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .about-index-link {
    white-space: normal;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .band-seg,
  .page-about .tl-item::before,
  .page-about .tl-text,
  .page-about .legend-cell,
  .page-about .role-list li,
  .page-about .about-index-link,
  .page-about .inline-link {
    transition: none;
  }

  .page-about .band-seg:hover {
    transform: none;
  }
}