.page-about {
  --about-tint: rgba(11, 14, 13, .55);
  --about-axis: rgba(195, 245, 60, .32);
  --about-gap: 26px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 24px 0 12px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 4px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 24px;
  margin-top: 14px;
}

.page-about .about-hero-copy .eyebrow {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 8vw, 62px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--chalk);
}

.page-about .about-hero-copy .lede {
  margin: 0 0 20px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-hero-facts {
  padding: 22px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .stat-value {
  display: block;
  font-family: var(--font-num);
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 26px;
  margin-top: 42px;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-index .toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-index .toc a {
  flex: 0 0 auto;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 13px;
  line-height: 1.4;
  color: var(--chalk);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.page-about .about-index .toc a:hover {
  border-color: var(--line-lime);
}

.page-about .about-index .toc a[aria-current="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 30px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sub {
  max-width: 46em;
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 22px 0 6px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  object-fit: cover;
  border: 1px solid var(--line-soft);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-figure--texture img {
  aspect-ratio: 1 / 1;
  max-width: 420px;
}

/* ---------- 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: 20px;
  margin-top: 22px;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--chalk);
}

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

.page-about .about-note {
  padding: 18px 20px;
  border-left: 3px solid var(--amber);
  transition: transform .2s ease, border-color .2s ease;
}

.page-about .about-note:hover {
  transform: translateX(4px);
  border-left-color: var(--lime);
}

.page-about .about-note-title {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 16px;
  margin-top: 24px;
  grid-template-columns: 1fr;
}

.page-about .about-team-card {
  position: relative;
  padding: 20px 20px 22px;
  background: var(--stand);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 54px;
  height: 4px;
  background: var(--lime);
}

.page-about .about-team-no {
  display: block;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .about-team-card h3 {
  margin: 8px 0 10px;
  font-family: var(--font-body);
  font-size: 19px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stage:first-child {
  border-top: 0;
}

.page-about .about-year {
  font-family: var(--font-num);
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .about-stage-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-stage-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 数据准则 ---------- */
.page-about .about-rule-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
  grid-template-columns: 1fr;
}

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

.page-about .about-rule-mark {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--amber);
}

.page-about .about-rule h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-rule p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-scale {
  padding: 26px 22px 28px;
}

.page-about .about-scale-text {
  max-width: 44em;
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--chalk);
}

.page-about .about-scale-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-scale-list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-scale-list .num {
  display: block;
  font-family: var(--font-num);
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--lime);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
  grid-template-columns: 1fr;
}

.page-about .about-partner {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--amber-deep);
  border-radius: var(--r-sm);
  background: var(--about-tint);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: 26px;
  padding: 22px;
  border: 1px solid var(--line-lime);
  border-radius: var(--r-md);
  background: var(--glass);
}

.page-about .about-cta p {
  margin: 0 0 18px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--chalk);
}

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

.page-about .about-cta-link {
  font-size: 14px;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-lime);
  padding-bottom: 2px;
}

.page-about .about-cta-link:hover {
  color: var(--chalk);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-rule-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-figure--texture img {
    max-width: 100%;
    aspect-ratio: 2 / 1;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding-top: 32px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .95fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    margin-top: 54px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--head-h) + 20px);
    align-self: start;
    padding-right: 8px;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .about-index .toc {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index .toc a {
    border: 0;
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--mist);
  }

  .page-about .about-index .toc a:hover {
    background: rgba(195, 245, 60, .08);
    color: var(--chalk);
  }

  .page-about .about-index .toc a[aria-current="true"] {
    background: var(--lime);
    color: var(--ink);
  }

  .page-about .about-section {
    padding: 42px 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .95fr);
    gap: 40px;
    align-items: start;
  }

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

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

  .page-about .about-timeline {
    position: relative;
    padding-left: 30px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 36px;
    bottom: 36px;
    width: 1px;
    background: linear-gradient(var(--about-axis), rgba(195, 245, 60, .06));
  }

  .page-about .about-stage {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 28px;
    padding: 26px 0;
  }

  .page-about .about-stage::before {
    content: "";
    position: absolute;
    left: -30px;
    top: 34px;
    width: 9px;
    height: 9px;
    background: var(--lime);
  }

  .page-about .about-year {
    font-size: 26px;
  }

  .page-about .about-scale {
    padding: 36px 34px 38px;
  }

  .page-about .about-scale-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .page-about .about-prose p {
    font-size: 17px;
  }
}