.page-about {
  --about-line: #1F3D30;
  --about-soft: #B9CBC2;
  --about-body: #C7D6CD;
  background: var(--ink);
  color: var(--paper);
}

.page-about [id] {
  scroll-margin-top: 116px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 22px 0 2px;
  font-size: 13px;
  color: var(--gray);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--lime);
}
.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--moss);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 6px 0 0;
}
.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  padding-bottom: 34px;
}
.page-about .about-hero__title {
  font-family: var(--font-serif);
  font-size: 33px;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 12px 0 18px;
  max-width: 15em;
  color: var(--paper);
}
.page-about .about-hero__intro {
  margin: 0;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-body);
}
.page-about .about-hero__stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--about-line);
  background: var(--about-line);
}
.page-about .about-stat {
  background: var(--pine);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}
.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--gray);
}
.page-about .about-hero__figure {
  margin: 0;
}

/* ---------- 索引胶囊 ---------- */
.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-index__pill {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 9px 15px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--paper);
  background: var(--navy);
  border: 1px solid var(--about-line);
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-index__pill:hover,
.page-about .about-index__pill:focus-visible {
  background: var(--moss);
  border-color: var(--lime);
  color: var(--lime);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: 46px 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-block__grid {
  display: grid;
  gap: 26px;
}
.page-about .about-block__grid .prose p,
.page-about .about-team__prose p {
  max-width: 34em;
}

/* ---------- 用途卡片 ---------- */
.page-about .about-uses {
  display: grid;
  gap: 14px;
}
.page-about .about-uses__card {
  background: var(--pine);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--lime);
  padding: 16px 18px;
}
.page-about .about-uses__card h3 {
  margin: 0 0 7px;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .about-uses__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 长期追踪轨道 ---------- */
.page-about .about-tracking__grid {
  display: grid;
  gap: 30px;
}
.page-about .track {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
  position: relative;
}
.page-about .track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime) 0%, var(--moss) 42%, var(--about-line) 100%);
}
.page-about .track__item {
  position: relative;
  padding-bottom: 16px;
}
.page-about .track__item:last-child {
  padding-bottom: 0;
}
.page-about .track__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 11px;
  height: 11px;
  background: var(--lime);
  border: 2px solid var(--ink);
  box-shadow: 0 0 0 1px var(--moss);
}
.page-about .track__card {
  background: var(--navy);
  border: 1px solid var(--about-line);
  padding: 15px 17px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .track__card:hover {
  border-color: var(--lime);
  box-shadow: inset 0 0 0 1px rgba(183, 255, 60, 0.14);
}
.page-about .track__step {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.page-about .track__card h3 {
  margin: 8px 0 6px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .track__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-soft);
}
.page-about .about-tracking__figure {
  margin: 0;
  max-width: 340px;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
}
.page-about .about-team__prose p {
  color: var(--about-body);
}
.page-about .about-team__chart {
  background: var(--pine);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--lime);
  padding: 22px 20px;
}
.page-about .split {
  display: grid;
  gap: 20px;
}
.page-about .split__head {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 9px;
  font-size: 14px;
  color: var(--paper);
}
.page-about .split__name {
  min-width: 0;
}
.page-about .split__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  color: var(--lime);
}
.page-about .split__bar {
  height: 12px;
  background: var(--ink);
  border: 1px solid var(--about-line);
  overflow: hidden;
}
.page-about .split__fill {
  display: block;
  height: 100%;
  transition: filter 0.2s var(--ease);
}
.page-about .split__fill--a {
  width: 59%;
  background: var(--lime);
}
.page-about .split__fill--b {
  width: 41%;
  background: var(--mist);
}
.page-about .split__fill--c {
  width: 78%;
  background: var(--orange);
}
.page-about .split__row:hover .split__fill {
  filter: brightness(1.3);
}
.page-about .about-team__note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 数据流程步骤 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: flex;
  gap: 1px;
  overflow-x: auto;
  scrollbar-width: thin;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .steps__item {
  flex: 0 0 78%;
  min-width: 0;
  background: var(--pine);
  padding: 18px 16px;
}
.page-about .steps__item h3 {
  margin: 12px 0 7px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}
.page-about .steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: #A9BDB4;
}
.page-about .steps__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

/* ---------- 年份时间线 ---------- */
.page-about .era {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
}
.page-about .era__item {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 12px;
  border-top: 1px solid var(--about-line);
  transition: background 0.2s var(--ease);
}
.page-about .era__item:last-child {
  border-bottom: 1px solid var(--about-line);
}
.page-about .era__item:hover {
  background: var(--navy);
}
.page-about .era__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--lime);
}
.page-about .era__item:hover .era__year {
  color: var(--orange);
}
.page-about .era__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .era__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-soft);
}
.page-about .about-era__figure {
  margin: 0;
}

/* ---------- 内容伙伴 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
}
.page-about .about-partners__card {
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.page-about .about-partners__card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.35;
  color: var(--paper);
}
.page-about .about-partners__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding: 46px 0 76px;
}
.page-about .about-next__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.3;
  color: var(--paper);
}
.page-about .about-next__grid {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}
.page-about .about-next__link {
  display: block;
  padding: 18px;
  background: var(--navy);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--about-line);
  text-decoration: none;
  color: var(--paper);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--pine);
  border-color: var(--lime);
  border-left-color: var(--lime);
}
.page-about .about-next__k {
  display: block;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}
.page-about .about-next__t {
  display: block;
  margin-top: 9px;
  font-size: 15px;
  line-height: 1.62;
  color: var(--about-body);
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 44px;
    align-items: center;
    padding-bottom: 44px;
  }
  .page-about .about-hero__title {
    font-size: 44px;
  }
  .page-about .about-hero__intro {
    font-size: 17.5px;
  }
  .page-about .about-stat__num {
    font-size: 28px;
  }
  .page-about .about-block {
    padding: 62px 0;
  }
  .page-about .about-block__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-tracking__grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }
  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .era {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 1px;
    background: var(--about-line);
    border: 1px solid var(--about-line);
    margin-bottom: 36px;
  }
  .page-about .era__item {
    display: block;
    grid-template-columns: none;
    border-top: 0;
    border-bottom: 0;
    background: var(--pine);
    padding: 22px 18px 26px;
  }
  .page-about .era__item:last-child {
    border-bottom: 0;
  }
  .page-about .era__item:hover {
    background: var(--navy);
  }
  .page-about .era__year {
    display: block;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--lime);
  }
}

@media (min-width: 1024px) {
  .page-about .steps {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow-x: visible;
  }
  .page-about .steps__item {
    flex: none;
    padding: 22px 18px 26px;
  }
}

@media (min-width: 1150px) {
  .page-about .about-hero__title {
    font-size: 48px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .split__fill,
  .page-about .track__card,
  .page-about .era__item,
  .page-about .about-next__link,
  .page-about .about-index__pill {
    transition: none;
  }
}
</main>