.page-about {
  --about-line: rgba(53, 240, 224, 0.28);
  --about-rule: rgba(147, 164, 200, 0.20);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(32px, 5vw, 72px) clamp(30px, 4.5vw, 58px);
  border-bottom: var(--edge);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -12% auto -12%;
  height: 140%;
  background:
    radial-gradient(58% 66% at 8% 4%, rgba(140, 91, 255, 0.24), transparent 62%),
    radial-gradient(50% 58% at 94% 96%, rgba(53, 240, 224, 0.15), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(147, 164, 200, 0.06) 1px, transparent 1px);
  background-size: 100% 44px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__index {
  margin: 0 0 18px;
  color: var(--text-dim);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 20ch;
}

.page-about .about-hero__body {
  display: grid;
  gap: 16px;
  max-width: 68ch;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-hero__meta {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .about-hero__stats .stat-tile {
  padding: 16px;
  background: var(--surface);
  border: var(--edge);
}

.page-about .about-hero__stats .stat-tile__value {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  letter-spacing: 0.02em;
  color: var(--frost);
}

.page-about .about-hero__stats .stat-tile__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__head {
  margin-bottom: clamp(22px, 3.6vw, 40px);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(28px, 5vw, 56px);
}

.page-about .tl {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .tl__rail {
  display: none;
}

.page-about .tl__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .tl__item {
  position: relative;
  padding-left: 28px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 21px;
  width: 11px;
  height: 11px;
  transform: rotate(45deg);
  background: var(--ink-800);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 12px rgba(53, 240, 224, 0.42);
}

.page-about .tl__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 38px;
  bottom: -18px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 240, 224, 0.45), rgba(140, 91, 255, 0.16));
}

.page-about .tl__node {
  background: var(--surface);
  border: var(--edge);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .tl__node[open] {
  border-left: 2px solid var(--cyan);
}

.page-about .tl__summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 16px 18px;
  cursor: pointer;
}

.page-about .tl__num {
  font-size: clamp(1.25rem, 3.4vw, 1.85rem);
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .tl__label {
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--frost);
}

.page-about .tl__body {
  padding: 0 18px 18px;
}

.page-about .tl__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 赛区 ---------- */
.page-about .about-regions__layout {
  display: grid;
  gap: clamp(22px, 3.6vw, 42px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-regions__map {
  padding: clamp(16px, 3vw, 28px);
  background: var(--ink-900);
  border: var(--edge);
}

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

.page-about .about-map__links line {
  stroke: rgba(53, 240, 224, 0.28);
  stroke-width: 1;
}

.page-about .about-map__hub {
  fill: none;
  stroke: var(--violet);
  stroke-width: 1.4;
}

.page-about .about-map__hub-text {
  fill: var(--frost);
  font-family: var(--font-data);
  font-size: 12px;
  text-anchor: middle;
}

.page-about .about-map__nodes circle {
  fill: var(--ink-800);
  stroke: var(--cyan);
  stroke-width: 1.4;
}

.page-about .about-map__labels text {
  fill: var(--text-dim);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-about .about-regions__legend {
  margin-top: 18px;
}

.page-about .legend__swatch--hub {
  background: var(--violet);
}

.page-about .legend__swatch--node {
  background: var(--cyan);
}

.page-about .about-regions__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .region-tile {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--surface);
  border: var(--edge);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), background 0.32s var(--ease);
}

.page-about .region-tile:hover,
.page-about .region-tile:focus-within {
  transform: translateY(-4px);
  background: var(--surface-2);
  border-color: rgba(53, 240, 224, 0.45);
}

.page-about .region-tile__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 46px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-flow__lead h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-flow__lead p {
  margin: 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--surface);
  border: var(--edge);
}

.page-about .step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  border-bottom: var(--edge);
}

.page-about .step:last-child {
  border-bottom: 0;
}

.page-about .step__no {
  padding-top: 4px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .step__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--frost);
}

.page-about .step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-team__body h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-team__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-team__roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .role {
  padding: 14px;
  background: var(--surface);
  border: var(--edge);
}

.page-about .role dt {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.page-about .role dd {
  margin: 8px 0 0;
  font-family: var(--font-data);
  font-size: 1.35rem;
  color: var(--cyan);
}

.page-about .about-team__routine {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__routine li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-team__routine li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 44px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-partners__body h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-partners__text {
  margin: 0 0 12px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-partners__report {
  margin-top: 20px;
  background: var(--surface);
  border: var(--edge);
}

.page-about .about-partners__report-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-partners__report-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-partners__report-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  border: 1px solid var(--violet);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next__inner {
  padding: clamp(24px, 4vw, 44px);
  border: var(--edge);
  background: linear-gradient(120deg, rgba(140, 91, 255, 0.18), rgba(53, 240, 224, 0.08));
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 图片通用 ---------- */
.page-about .media-frame {
  overflow: hidden;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .tl {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .page-about .tl__rail {
    display: block;
    align-self: start;
    position: sticky;
    top: 104px;
    padding-right: 14px;
    border-right: var(--edge);
  }

  .page-about .tl__rail-title {
    display: block;
    margin-bottom: 14px;
    font-size: 12px;
    letter-spacing: 0.16em;
    color: var(--text-dim);
  }

  .page-about .tl__rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
  }

  .page-about .tl__rail-item {
    display: grid;
    gap: 3px;
  }

  .page-about .tl__rail-item .data-num {
    font-size: 1.05rem;
    color: var(--cyan);
    letter-spacing: 0.02em;
  }

  .page-about .tl__rail-tag {
    font-size: 11.5px;
    letter-spacing: 0.12em;
    color: var(--mist);
  }

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

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region-tile,
  .page-about .tl__node {
    transition: none;
  }

  .page-about .region-tile:hover,
  .page-about .region-tile:focus-within {
    transform: none;
  }
}