.page-about {
  overflow-x: clip;
  --about-line: 1px solid var(--seam);
  --about-edge: 2px solid var(--seam);
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  padding-bottom: clamp(36px, 6vw, 76px);
  border-bottom: var(--about-edge);
}

.page-about .about-kicker {
  margin: 20px 0 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--turf);
}

.page-about .about-title {
  margin: 0 0 22px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 7.2vw, 78px);
  line-height: 1.03;
  letter-spacing: -0.012em;
  color: var(--chalk);
}

.page-about .about-lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-anchors {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: var(--about-edge);
}

.page-about .about-anchor-num {
  display: block;
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5.2vw, 46px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-anchor-plus {
  color: var(--turf);
  font-size: 0.7em;
  margin-left: 2px;
}

.page-about .about-anchor-txt {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 双栏长滚动 ---------- */
.page-about .about-duo {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-duo-main {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  min-width: 0;
}

.page-about .about-panel {
  background: var(--pitch);
  border: var(--about-edge);
  box-shadow: var(--shadow-hard);
  padding: clamp(20px, 3vw, 34px);
  min-width: 0;
}

.page-about .about-panel-title {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.page-about .about-panel-body {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-panel-body:last-child {
  margin-bottom: 0;
}

.page-about .about-panel-body--tight {
  padding-left: 14px;
  border-left: 2px solid var(--turf);
  color: var(--chalk);
  font-size: 14px;
}

/* 折叠表 */
.page-about .about-fold {
  margin-top: 22px;
  border: var(--about-edge);
  background: var(--pitch-deep);
}

.page-about .about-fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--chalk);
}

.page-about .about-fold > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-fold > summary:focus-visible {
  outline: 2px solid var(--turf);
  outline-offset: -2px;
}

.page-about .about-fold-hint {
  color: var(--turf);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .about-fold[open] > summary {
  border-bottom: var(--about-line);
}

.page-about .about-fold-body {
  padding: 4px 16px 16px;
}

.page-about .about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--seam);
  vertical-align: top;
}

.page-about .about-table thead th {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--turf);
  border-bottom: 2px solid var(--seam);
}

.page-about .about-table tbody th {
  font-weight: 500;
  color: var(--chalk);
}

.page-about .about-table tbody td {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  color: var(--mist);
}

/* 跑动读法 */
.page-about .about-read-group {
  display: grid;
  gap: 14px;
  margin: 22px 0;
}

.page-about .about-read {
  padding: 16px;
  background: var(--pitch-deep);
  border-left: 3px solid var(--cold);
}

.page-about .about-read-key {
  display: block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cold);
}

.page-about .about-read-val {
  display: block;
  margin: 6px 0 8px;
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-read-val em {
  font-style: normal;
  font-size: 0.42em;
  font-weight: 500;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .about-read p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* 右栏 */
.page-about .about-duo-rail {
  min-width: 0;
}

.page-about .about-rail-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-rail-figure {
  margin: 0 0 26px;
  border: var(--about-edge);
  background: var(--pitch-deep);
}

.page-about .about-rail-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.06);
}

.page-about .about-rail-figure figcaption {
  padding: 12px 14px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist);
  border-top: var(--about-line);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--seam);
}

.page-about .about-tl-item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pitch);
  border: 2px solid var(--seam);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.page-about .about-tl-item.is-in::before {
  background: var(--turf);
  border-color: var(--turf);
  box-shadow: 0 0 0 5px var(--turf-soft);
}

.page-about .about-tl-year {
  margin: 0;
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color 0.4s var(--ease);
}

.page-about .about-tl-item.is-in .about-tl-year {
  color: var(--turf);
}

.page-about .about-tl-title {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.25;
  color: var(--chalk);
}

.page-about .about-tl-body {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 通用章节标题 ---------- */
.page-about .about-section-title {
  margin: 14px 0 16px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(28px, 5vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.012em;
  color: var(--chalk);
}

.page-about .about-section-lede {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(40px, 6vw, 80px);
  border-top: var(--about-edge);
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-team-media {
  margin: 0;
  border: var(--about-edge);
  background: var(--pitch-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.55) contrast(1.08);
}

.page-about .about-team-media figcaption {
  padding: 12px 14px;
  font-size: 12px;
  color: var(--mist);
  border-top: var(--about-line);
}

.page-about .about-crews {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-edge);
}

.page-about .about-crew {
  padding: 22px 0;
  border-bottom: var(--about-line);
}

.page-about .about-crew-num {
  display: block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ember);
  margin-bottom: 10px;
}

.page-about .about-crew-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--chalk);
}

.page-about .about-crew p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 覆盖图谱 ---------- */
.page-about .about-cover-wrap {
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 50px);
  background: var(--pitch-deep);
  border: var(--about-edge);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cover-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.35) contrast(1.2);
  pointer-events: none;
}

.page-about .about-cover-head,
.page-about .about-blocks,
.page-about .about-cover-legend {
  position: relative;
  z-index: 1;
}

.page-about .about-blocks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-block {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  min-height: 96px;
  padding: 14px 12px;
  background: rgba(16, 33, 28, 0.78);
  border: var(--about-edge);
  border-top-color: var(--cold);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-block--south {
  border-top-color: var(--ember);
}

.page-about .about-block--asia {
  border-top-color: var(--turf);
}

.page-about .about-block:hover {
  transform: translateY(-4px);
  border-color: var(--turf);
  box-shadow: var(--shadow-hard);
}

.page-about .about-block-id {
  font-family: var(--font-data);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1;
  color: var(--chalk);
}

.page-about .about-block-region {
  display: block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-block-num {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--chalk);
}

.page-about .about-cover-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 24px;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partner {
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(48px, 7vw, 96px);
  border-top: var(--about-edge);
}

.page-about .about-partner-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-partner-item {
  padding: 22px 20px;
  background: var(--pitch);
  border: var(--about-edge);
  border-left: 4px solid var(--seam);
  transition: border-left-color 0.28s var(--ease);
}

.page-about .about-partner-item:hover {
  border-left-color: var(--turf);
}

.page-about .about-partner-item h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--chalk);
}

.page-about .about-partner-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-partner-note {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 20px 22px;
  border: var(--about-edge);
  background: var(--pitch-deep);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-partner-note a {
  color: var(--turf);
  text-decoration: none;
  border-bottom: 1px solid var(--turf-soft);
}

.page-about .about-partner-note a:hover,
.page-about .about-partner-note a:focus-visible {
  border-bottom-color: var(--turf);
}

.page-about .about-partner-note a:focus-visible {
  outline: 2px solid var(--turf);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-anchors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-blocks {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-crews {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 56px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-duo {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-duo-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
  }

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

  .page-about .about-crew {
    padding: 24px 22px 24px 0;
    border-bottom: none;
    border-right: var(--about-line);
  }

  .page-about .about-crew:last-child {
    border-right: none;
    padding-right: 0;
  }
}

@media (min-width: 1280px) {
  .page-about .about-cover {
    padding: clamp(36px, 3.5vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-block,
  .page-about .about-tl-item::before,
  .page-about .about-tl-year,
  .page-about .about-partner-item {
    transition: none;
  }

  .page-about .about-block:hover {
    transform: none;
  }
}