.page-about {
  --about-rail: 170px;
  --about-gap: 44px;
  --about-cream-ink: #33404F;
  --about-cream-soft: #6B7480;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 13px;
  color: var(--stone);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

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

.page-about .breadcrumbs__sep {
  color: var(--stone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 22px 0 6px;
  position: relative;
}

.page-about .about-hero::after {
  content: "";
  display: block;
  height: 1px;
  margin-top: 44px;
  background: linear-gradient(90deg, var(--amber) 0%, rgba(61,245,192,.55) 42%, rgba(201,209,217,.08) 100%);
}

.page-about .about-hero .eyebrow {
  margin-bottom: 16px;
}

.page-about .about-hero .display-title {
  max-width: 900px;
  letter-spacing: -.015em;
}

.page-about .about-hero .lede {
  max-width: 730px;
  margin-top: 18px;
  color: var(--mist);
}

.page-about .about-toc {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(156px, 1fr));
  gap: 9px;
}

.page-about .about-toc__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: rgba(26, 34, 48, .6);
  color: var(--mist);
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background .2s ease, color .2s ease;
}

.page-about .about-toc__item:hover,
.page-about .about-toc__item:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(61, 245, 192, .6);
  background: rgba(26, 34, 48, .92);
  color: var(--cream);
}

.page-about .about-toc__no {
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--amber);
}

.page-about .about-toc__label {
  font-size: 14px;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: 54px 0 8px;
}

.page-about .chapter__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .chapter__no {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .chapter__kicker {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--mist);
  opacity: .72;
}

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

.page-about .chapter__lead {
  margin-top: 14px;
  max-width: 720px;
  color: var(--mist);
  line-height: 1.75;
}

.page-about .chapter__text {
  margin-top: 24px;
  max-width: 760px;
  color: var(--mist);
  line-height: 1.78;
}

.page-about .chapter__grid {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .chapter__prose p {
  color: var(--mist);
  line-height: 1.78;
}

.page-about .chapter__prose p + p {
  margin-top: 15px;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-m);
  object-fit: cover;
}

.page-about .media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.65;
  color: var(--stone);
}

.page-about .mini-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.005em;
}

/* ---------- 米白编辑页 ---------- */
.page-about .chapter--cream .chapter__inner {
  padding: 30px 22px 36px;
  background: var(--cream);
  color: var(--ink);
  border-radius: var(--radius-l);
}

.page-about .chapter--cream .chapter__kicker {
  color: var(--about-cream-soft);
  opacity: 1;
}

.page-about .chapter--cream .chapter__no {
  color: var(--clay);
}

.page-about .chapter--cream .chapter__lead,
.page-about .chapter--cream .chapter__text,
.page-about .chapter--cream .chapter__prose p {
  color: var(--about-cream-ink);
}

/* ---------- 团队档案 ---------- */
.page-about .crew {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .crew__lead {
  border: 1px solid rgba(11, 18, 32, .13);
  border-radius: var(--radius-m);
  padding: 20px 22px;
  background: rgba(255, 255, 255, .62);
}

.page-about .crew__num {
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink);
}

.page-about .crew__unit {
  margin-left: 5px;
  font-size: 16px;
  color: var(--about-cream-soft);
}

.page-about .crew__cap {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-cream-ink);
}

.page-about .crew__split {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 14px;
  align-content: center;
}

.page-about .crew__split li {
  padding-left: 11px;
  border-left: 2px solid var(--moss);
  font-size: 13.5px;
  color: var(--about-cream-ink);
}

.page-about .crew__split strong {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}

.page-about .shift-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .shift {
  border: 1px solid rgba(11, 18, 32, .13);
  border-radius: var(--radius-m);
  padding: 16px 18px;
  background: rgba(255, 255, 255, .62);
}

.page-about .shift p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-cream-ink);
}

/* ---------- 节奏数据条 ---------- */
.page-about .stat-strip {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(146px, 1fr));
  gap: 16px 18px;
}

.page-about .stat-strip__item {
  padding-top: 12px;
  border-top: 2px solid rgba(255, 106, 0, .55);
}

.page-about .stat-strip__num {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--ink);
  letter-spacing: -.01em;
}

.page-about .stat-strip__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-cream-soft);
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-row {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.page-about .region-board {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 18px;
  background: linear-gradient(155deg, rgba(95, 127, 106, .16), rgba(11, 18, 32, .5) 62%);
}

.page-about .region-board__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--mist);
}

.page-about .region-board__head .mono {
  font-size: 28px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: -.01em;
}

.page-about .region-board__grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16px, 1fr));
  gap: 6px;
}

.page-about .region-board__cell {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 3px;
  background: rgba(201, 209, 217, .13);
}

.page-about .region-board__cell.is-strong { background: rgba(255, 106, 0, .58); }
.page-about .region-board__cell.is-moss { background: rgba(95, 127, 106, .7); }
.page-about .region-board__cell.is-mint { background: rgba(61, 245, 192, .5); }

.page-about .coverage-note p {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .sport-tags {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 电脑端示意 ---------- */
.page-about .pane-map {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 6fr) minmax(0, 3fr);
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(26, 34, 48, .58);
}

.page-about .pane {
  display: flex;
  align-items: flex-end;
  min-height: 108px;
  padding: 10px;
  border: 1px dashed rgba(201, 209, 217, .2);
  border-radius: 10px;
  background: rgba(201, 209, 217, .07);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .pane--mid {
  min-height: 148px;
  border: 1px solid rgba(255, 106, 0, .45);
  background: linear-gradient(180deg, rgba(255, 106, 0, .22), rgba(255, 106, 0, .05));
  color: var(--cream);
}

.page-about .pane--right {
  border-color: rgba(61, 245, 192, .38);
  border-style: solid;
  background: rgba(61, 245, 192, .07);
  color: var(--mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--moss) 0%, var(--clay) 52%, var(--amber) 100%);
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 20px;
}

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

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 27px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--moss);
  box-shadow: 0 0 0 4px rgba(95, 127, 106, .22);
}

.page-about .tl-node--clay::before {
  background: var(--clay);
  box-shadow: 0 0 0 4px rgba(185, 106, 75, .22);
}

.page-about .tl-node--amber::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 106, 0, .2);
}

.page-about .tl-node__card {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 18px 20px 20px;
  background: linear-gradient(180deg, rgba(26, 34, 48, .9), rgba(11, 18, 32, .9));
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.page-about .tl-node:hover .tl-node__card,
.page-about .tl-node:focus-within .tl-node__card {
  transform: translateY(-3px);
  border-color: rgba(255, 106, 0, .55);
  box-shadow: var(--shadow-lift);
}

.page-about .tl-node__ver {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .tl-node__title {
  margin-top: 8px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.005em;
}

.page-about .tl-node__text {
  margin-top: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tl-node__brief {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
  transition: max-height .32s ease, opacity .28s ease, margin-top .32s ease;
}

.page-about .tl-node:hover .tl-node__brief,
.page-about .tl-node:focus-within .tl-node__brief {
  max-height: 140px;
  margin-top: 10px;
  opacity: 1;
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  margin-top: 26px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .eco-card {
  border-radius: var(--radius-m);
  padding: 22px;
  border: 1px solid rgba(185, 106, 75, .32);
  background: linear-gradient(150deg, rgba(185, 106, 75, .16), rgba(255, 255, 255, .55) 62%);
}

.page-about .eco-card--moss {
  border-color: rgba(95, 127, 106, .42);
  background: linear-gradient(150deg, rgba(95, 127, 106, .2), rgba(255, 255, 255, .55) 62%);
}

.page-about .eco-card__num {
  display: block;
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--clay);
}

.page-about .eco-card--moss .eco-card__num {
  color: var(--moss);
}

.page-about .eco-card__title {
  margin-top: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .eco-card p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-cream-ink);
}

.page-about .honor {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 16px 20px;
  border-radius: var(--radius-m);
  border: 1px solid rgba(185, 106, 75, .3);
  background: rgba(185, 106, 75, .08);
}

.page-about .honor__num {
  font-size: 20px;
  font-weight: 700;
  color: var(--clay);
  letter-spacing: -.01em;
}

.page-about .honor__text {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-cream-ink);
}

/* ---------- 三件事 ---------- */
.page-about .pledge {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .pledge__item {
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber);
  border-radius: var(--radius-m);
  padding: 20px 20px 22px;
  background: rgba(26, 34, 48, .62);
}

.page-about .pledge__item--mint { border-top-color: var(--mint); }
.page-about .pledge__item--moss { border-top-color: var(--moss); }

.page-about .pledge__key {
  font-family: var(--font-serif);
  font-size: 28px;
  line-height: 1;
  color: var(--amber);
}

.page-about .pledge__item--mint .pledge__key { color: var(--mint); }
.page-about .pledge__item--moss .pledge__key { color: var(--moss); }

.page-about .pledge__title {
  margin-top: 10px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -.005em;
}

.page-about .pledge__item p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 收束 CTA ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 24px 22px 26px;
  border-radius: var(--radius-l);
  border: 1px solid rgba(255, 106, 0, .32);
  background: linear-gradient(140deg, rgba(255, 106, 0, .16), rgba(11, 18, 32, .5) 58%);
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-cta p {
  margin-top: 10px;
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .chapter__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-left: 16px;
    border-left: 2px solid rgba(255, 106, 0, .5);
    position: sticky;
    top: 128px;
  }

  .page-about .chapter--cream .chapter__rail {
    border-left-color: rgba(185, 106, 75, .55);
  }

  .page-about .chapter {
    padding: 68px 0 12px;
  }

  .page-about .chapter--cream .chapter__inner {
    padding: 38px 34px 42px;
  }

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

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

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

@media (min-width: 860px) {
  .page-about .chapter__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .chapter__grid--flip {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }

  .page-about .coverage-row {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .crew {
    grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
    gap: 30px;
    align-items: center;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
    padding: 30px 32px;
  }
}

@media (max-width: 560px) {
  .page-about .pane-map {
    grid-template-columns: 1fr;
  }

  .page-about .pane {
    min-height: 60px;
  }

  .page-about .pane--mid {
    min-height: 82px;
  }

  .page-about .about-toc {
    grid-template-columns: 1fr;
  }
}

@media (hover: none) {
  .page-about .tl-node__brief {
    max-height: none;
    margin-top: 10px;
    opacity: 1;
  }
}

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

  .page-about .about-toc__item:hover,
  .page-about .tl-node:hover .tl-node__card {
    transform: none;
  }
}