.page-about {
  position: relative;
  padding: clamp(18px, 3vw, 34px) 0 clamp(56px, 8vw, 104px);
  font-family: var(--font-sans);
  color: var(--muted);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .28;
  pointer-events: none;
}

.page-about .about-wrap {
  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 40px));
  margin-inline: auto;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-bottom: clamp(24px, 4vw, 42px);
  border-bottom: 1px solid var(--line);
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

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

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

.page-about .crumbs [aria-current="page"] {
  color: var(--white);
}

.page-about .eyebrow {
  margin: clamp(20px, 3vw, 32px) 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  max-width: 22ch;
  font-size: clamp(2rem, 5.4vw, 3.9rem);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .lede,
.page-about .section-lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 40px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .stat-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--panel);
}

.page-about .stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .stat-label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 骨架：索引 + 正文 ---------- */

.page-about .about-shell {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(32px, 6vw, 64px);
}

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

.page-about .note-vertical {
  display: none;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--line);
}

.page-about .about-index ol {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index a {
  display: block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, .08);
}

.page-about .about-body {
  display: grid;
  gap: clamp(40px, 6vw, 72px);
  min-width: 0;
}

/* ---------- 区块与标题 ---------- */

.page-about .about-section {
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: clamp(16px, 2.6vw, 24px);
}

.page-about .section-index {
  display: inline-flex;
  align-items: center;
  min-width: 46px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 86% 100%, 0 100%);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 800;
  line-height: 1.24;
  color: var(--white);
}

.page-about .split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
  min-width: 0;
}

.page-about .split-text p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
}

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

.page-about .link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 255, .45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.page-about .split-media {
  margin: 0;
}

.page-about .media-frame {
  display: block;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

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

.page-about .media-frame--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .media-frame--square img {
  aspect-ratio: 1 / 1;
}

.page-about .wide-figure {
  margin: clamp(24px, 4vw, 36px) 0 0;
}

.page-about .wide-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  opacity: .85;
}

/* ---------- 团队比例 ---------- */

.page-about .team-bar {
  display: flex;
  height: 20px;
  margin-top: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: var(--panel);
}

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

.page-about .team-seg:hover {
  filter: brightness(1.25);
}

.page-about .team-seg--verify { flex: 12 1 0; background: var(--cyan); }
.page-about .team-seg--content { flex: 18 1 0; background: var(--orange); }
.page-about .team-seg--front { flex: 9 1 0; background: var(--lg-football); }
.page-about .team-seg--support { flex: 6 1 0; background: var(--lg-basket); }

.page-about .team-legend {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 10px 42px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .team-legend li:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
}

.page-about .hue-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}

.page-about .hue-dot--verify { background: var(--cyan); }
.page-about .hue-dot--content { background: var(--orange); }
.page-about .hue-dot--front { background: var(--lg-football); }
.page-about .hue-dot--support { background: var(--lg-basket); }

.page-about .legend-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .legend-text {
  font-size: 14px;
  line-height: 1.72;
}

.page-about .legend-text strong {
  color: var(--white);
  font-weight: 700;
  margin-right: 4px;
}

/* ---------- 数据链路 ---------- */

.page-about .pipeline-cards {
  display: grid;
  gap: 10px;
}

.page-about .mini-card {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-md);
}

.page-about .mini-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  min-width: 62px;
}

.page-about .mini-label {
  font-size: 13px;
  line-height: 1.6;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 40%, var(--line));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
  outline: none;
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dot, var(--cyan));
}

.page-about .tl-item--cyan { --dot: var(--cyan); }
.page-about .tl-item--football { --dot: var(--lg-football); }
.page-about .tl-item--basket { --dot: var(--lg-basket); }
.page-about .tl-item--cup { --dot: var(--lg-cup); }

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-visible::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 255, .14);
}

.page-about .tl-year {
  display: block;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-year,
.page-about .tl-item:focus-visible .tl-year {
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 2px 0 6px;
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 700;
  color: var(--white);
}

.page-about .tl-body {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 合作生态 ---------- */

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

.page-about .network-card {
  padding: clamp(18px, 3vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .network-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
}

.page-about .network-card--accent {
  border-color: rgba(255, 122, 24, .5);
  background: linear-gradient(160deg, rgba(255, 122, 24, .12), var(--panel) 62%);
}

.page-about .network-num {
  display: block;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .network-card--accent .network-num {
  color: var(--orange-soft);
}

.page-about .network-card h3 {
  margin: 10px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .network-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
}

.page-about .network-tail {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 联络 ---------- */

.page-about .contact-list {
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .contact-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .contact-row dt {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .contact-row dd {
  margin: 0;
  font-size: 15px;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 响应式 ---------- */

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

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

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

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

@media (min-width: 900px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .split--media-first {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  }

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

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .note-vertical {
    display: block;
  }

  .page-about .about-index ol {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-index li + li {
    margin-top: 2px;
  }

  .page-about .about-index a {
    padding: 9px 10px;
    border: none;
    border-left: 2px solid var(--line);
    border-radius: 0;
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    border-left-color: var(--cyan);
    background: transparent;
  }

  .page-about .timeline {
    padding-left: 42px;
  }

  .page-about .tl-item::before {
    left: -42px;
  }

  .page-about .tl-item::after {
    left: -38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-legend li,
  .page-about .network-card {
    transition: none;
  }

  .page-about .team-legend li:hover,
  .page-about .network-card:hover {
    transform: none;
  }
}