.page-about {
  --about-hair: rgba(53, 96, 74, 0.22);
  --about-hair-dark: rgba(244, 240, 230, 0.16);
  background: var(--c-cream);
  color: var(--c-rock);
}

.page-about .section {
  padding-block: clamp(48px, 6.5vw, 84px);
}

.page-about .about-intro { background: var(--c-cream); }
.page-about .about-origin-section { background: var(--c-paper); }
.page-about .about-timeline-section { background: var(--c-ink); color: var(--c-on-dark); }
.page-about .about-ends-section { background: var(--c-card); }
.page-about .about-team-section { background: var(--c-cream); }
.page-about .about-data-section { background: var(--c-paper); }
.page-about .about-scale-section { background: var(--c-cream); }
.page-about .about-close-section { background: var(--c-card); }

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-head {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .about-head-note {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-moss);
}

.page-about .about-timeline-section .about-head h2,
.page-about .about-timeline-section .about-head-note {
  color: var(--c-on-dark);
}

.page-about .about-timeline-section .about-head-note {
  color: var(--c-on-dark-soft);
}

.page-about .about-timeline-section .kicker {
  color: var(--c-orange);
}

/* ---------- 首屏 ---------- */

.page-about .about-intro-grid {
  display: grid;
  gap: 32px;
  margin-top: 22px;
}

.page-about .about-lede {
  margin-top: 18px;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-rock);
}

.page-about .about-intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 18px 16px 20px;
  background: var(--c-paper);
}

.page-about .about-fact-label {
  order: 2;
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-moss);
}

.page-about .about-fact-num {
  order: 1;
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .about-fact-num .figure {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact-tail {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-clay-orange);
}

/* ---------- 起点 ---------- */

.page-about .about-origin-grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin-copy h2 {
  margin-top: 10px;
}

.page-about .about-origin-copy .prose {
  margin-top: 18px;
}

.page-about .about-origin-media {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-ink);
}

.page-about .about-origin-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-origin-media figcaption {
  padding: 14px 18px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-on-dark-soft);
  background: var(--c-ink);
}

/* ---------- 时间轴 ---------- */

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 36px;
  bottom: 36px;
  width: 1px;
  background: var(--about-hair-dark);
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 34px;
  border-top: 1px solid var(--about-hair-dark);
}

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

.page-about .about-tl-node {
  margin: 0;
}

.page-about .about-tl-sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

.page-about .about-tl-sum::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl-title {
  flex: 1 1 200px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--c-on-dark);
}

.page-about .about-tl-mark {
  position: absolute;
  left: 1px;
  top: 27px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-clay);
  transition: background 0.3s var(--ease-soft), box-shadow 0.3s var(--ease-soft);
}

.page-about .about-tl-node[open] .about-tl-mark {
  background: var(--c-orange);
  box-shadow: 0 0 0 5px rgba(232, 121, 43, 0.2);
}

.page-about .about-tl-arrow {
  width: 9px;
  height: 9px;
  margin-left: auto;
  align-self: center;
  border-right: 2px solid var(--c-on-dark-faint);
  border-bottom: 2px solid var(--c-on-dark-faint);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease-soft);
}

.page-about .about-tl-node[open] .about-tl-arrow {
  transform: rotate(-135deg);
}

.page-about .about-tl-body {
  max-width: 62ch;
  padding: 0 0 24px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-on-dark-soft);
}

.page-about .about-tl-body p {
  margin: 0;
}

/* ---------- 三端形态 ---------- */

.page-about .about-ends-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-end-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px 26px;
  background: var(--c-paper);
  border-radius: var(--radius-card);
  border-top: 4px solid var(--c-moss);
}

.page-about .about-end-card--mobile { border-top-color: var(--c-orange); }
.page-about .about-end-card--desktop { border-top-color: var(--c-blue); }
.page-about .about-end-card--big { border-top-color: var(--c-clay); }

.page-about .about-end-device {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-clay-orange);
}

.page-about .about-end-card--desktop .about-end-device { color: var(--c-blue-deep); }
.page-about .about-end-card--big .about-end-device { color: var(--c-clay); }

.page-about .about-end-title {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink);
}

.page-about .about-end-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-rock);
}

.page-about .about-ends-media {
  margin: 32px 0 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-pine);
}

.page-about .about-ends-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 团队 ---------- */

.page-about .about-team-grid {
  display: grid;
  gap: 30px;
}

.page-about .about-team-copy h2 {
  margin-top: 10px;
}

.page-about .about-team-copy .prose {
  margin-top: 18px;
}

.page-about .about-team-media {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--c-ink);
}

.page-about .about-team-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-bars {
  display: grid;
  gap: 22px;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .about-bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .about-bar-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .about-bar-count {
  font-size: 14px;
  color: var(--c-moss);
}

.page-about .about-bar-count .figure {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bar-track {
  height: 10px;
  border-radius: var(--radius-pill);
  background: var(--c-card);
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--c-moss), var(--c-ink));
}

.page-about .about-bar:nth-child(1) .about-bar-fill { width: 53.8%; background: linear-gradient(90deg, var(--c-moss), var(--c-ink)); }
.page-about .about-bar:nth-child(2) .about-bar-fill { width: 30.8%; background: linear-gradient(90deg, var(--c-clay-orange), var(--c-clay)); }
.page-about .about-bar:nth-child(3) .about-bar-fill { width: 15.4%; background: linear-gradient(90deg, var(--c-blue), var(--c-blue-deep)); }

.page-about .about-bar-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 数据来源 ---------- */

.page-about .about-data-grid {
  display: grid;
  gap: 34px;
}

.page-about .about-data-copy h2 {
  margin-top: 10px;
}

.page-about .about-data-copy .prose {
  margin-top: 18px;
}

.page-about .about-flow {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-flow-item {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-flow-num {
  flex: 0 0 auto;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-clay-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow-title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-flow-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 规模 ---------- */

.page-about .about-scale-grid {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scale-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 22px 24px;
  background: var(--c-paper);
  border-radius: var(--radius-card);
  border-left: 5px solid var(--c-moss);
}

.page-about .about-scale-num {
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-clay-orange);
}

.page-about .about-scale-note {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 收尾 ---------- */

.page-about .about-close-card {
  display: grid;
  gap: 22px;
  padding: 28px 24px;
  background: var(--c-paper);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-card);
}

.page-about .about-close-body {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-rock);
}

.page-about .about-close-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-close-meta {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-moss);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .about-ends-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-scale-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-bars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 880px) {
  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
    margin-top: 32px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-data-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-close-card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 34px 36px;
  }
}

@media (min-width: 920px) {
  .page-about .about-timeline::before {
    left: 151px;
  }

  .page-about .about-tl-item {
    padding-left: 0;
  }

  .page-about .about-tl-sum {
    display: grid;
    grid-template-columns: 132px 38px minmax(0, 1fr) 22px;
    align-items: center;
    gap: 0;
    padding: 22px 0;
  }

  .page-about .about-tl-year {
    font-size: 34px;
  }

  .page-about .about-tl-mark {
    position: static;
    left: auto;
    top: auto;
    justify-self: center;
  }

  .page-about .about-tl-arrow {
    margin-left: 0;
    justify-self: end;
  }

  .page-about .about-tl-body {
    padding-left: 170px;
    padding-bottom: 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-scale-num {
    font-size: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-mark,
  .page-about .about-tl-arrow {
    transition: none;
  }
}