.page-about {
  --about-sticky-top: calc(var(--bar-h) + 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 18px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mute);
}

.page-about .breadcrumbs__item {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumbs a.breadcrumbs__item {
  transition: color 0.2s ease;
}

.page-about .breadcrumbs a.breadcrumbs__item:hover,
.page-about .breadcrumbs a.breadcrumbs__item:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--mute);
  opacity: 0.7;
}

/* ---------- 通用章节标题 ---------- */
.page-about .about-sec-index {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-sec-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(25px, 6.4vw, 40px);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-inline-link {
  display: inline-block;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1.5px solid var(--rule);
  padding-bottom: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--cyan-hi);
  border-color: var(--cyan-hi);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 34px;
  border-bottom: 1.5px solid var(--rule);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--rule-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule-soft) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(circle at 76% 34%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 76% 34%, #000 0%, transparent 70%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mute);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(30px, 8.4vw, 56px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: 0.004em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0 0 26px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 0;
  padding-top: 16px;
  border-top: 1.5px solid var(--rule);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 2px solid var(--rule);
}

.page-about .about-fact__k {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.page-about .about-fact__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}

.page-about .about-hero__stamp {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-hero__year {
  font-family: var(--font-mono);
  font-size: clamp(76px, 25vw, 160px);
  font-weight: 500;
  line-height: 0.84;
  letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  text-shadow: 0 0 48px rgba(53, 240, 200, 0.3), 4px 4px 0 var(--line);
}

.page-about .about-hero__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

/* ---------- 01 缘起 ---------- */
.page-about .about-origin {
  padding: 46px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 20px;
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--mist);
}

.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 02 历程轨道 ---------- */
.page-about .about-journey {
  padding-top: 46px;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-journey__head {
  display: grid;
  gap: 4px;
  margin-bottom: 20px;
}

.page-about .about-journey__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-journey__rail {
  position: sticky;
  top: var(--bar-h);
  z-index: 15;
  background: var(--ink);
  border-top: 1.5px solid var(--rule);
  border-bottom: 1.5px solid var(--rule);
  box-shadow: 0 6px 0 rgba(2, 8, 6, 0.55);
}

.page-about .about-journey__scroll {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 14px 20px;
  list-style: none;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-journey__scroll::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-journey__scroll::-webkit-scrollbar-track {
  background: transparent;
}

.page-about .about-journey__scroll::-webkit-scrollbar-thumb {
  background: var(--rule);
}

.page-about .track-node {
  flex: 0 0 auto;
  display: grid;
  gap: 4px;
  width: 152px;
  padding: 11px 12px;
  scroll-snap-align: start;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .track-node:hover,
.page-about .track-node:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
}

.page-about .track-node__year {
  font-family: var(--font-mono);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .track-node__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .track-node__hint {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--mute);
  transition: max-height 0.24s ease, opacity 0.24s ease;
}

.page-about .track-node:hover .track-node__hint,
.page-about .track-node:focus-visible .track-node__hint {
  max-height: 60px;
  opacity: 1;
}

@media (hover: none) {
  .page-about .track-node__hint {
    max-height: 60px;
    opacity: 1;
  }
}

/* ---------- 里程碑条目 ---------- */
.page-about .about-journey__items {
  padding-bottom: 8px;
}

.page-about .about-ms {
  border-bottom: 1.5px solid var(--rule);
  scroll-margin-top: var(--about-sticky-top);
}

.page-about .about-ms:last-child {
  border-bottom: none;
}

.page-about .about-ms__grid {
  display: grid;
  gap: 16px;
  padding: 32px 0;
}

.page-about .about-ms__stamp {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-ms__year {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-ms__body {
  padding-left: 18px;
  border-left: 3px solid var(--amber);
}

.page-about .about-ms__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(20px, 4.6vw, 27px);
  font-weight: 600;
  line-height: 1.26;
  color: var(--paper);
}

.page-about .about-ms__body p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--mist);
}

.page-about .about-ms__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-ms__figure {
  margin: 20px 0 0;
  max-width: 560px;
  border: 1.5px solid var(--rule);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 03 数据流程 ---------- */
.page-about .about-flow {
  padding: 46px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-flow__head {
  display: grid;
  gap: 4px;
  margin-bottom: 26px;
}

.page-about .about-flow__lede {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-flow__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1.5px solid var(--rule);
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 6px;
  padding: 20px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .flow-step__no {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .flow-step__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .flow-step__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  padding: 46px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-team__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-team__figure {
  order: 2;
  margin: 0;
  border: 1.5px solid var(--rule);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-team__body {
  order: 1;
}

.page-about .about-team__body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--mist);
}

.page-about .about-map {
  margin-top: 20px;
  padding: 12px;
  background: var(--panel);
  border: 1.5px solid var(--rule);
}

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

.page-about .about-map__link {
  fill: none;
  stroke: var(--mute);
  stroke-width: 1.5;
  stroke-dasharray: 5 7;
  opacity: 0.55;
}

.page-about .about-map__link--ghost {
  opacity: 0.24;
}

.page-about .about-map__node {
  cursor: pointer;
  outline: none;
}

.page-about .about-map__node circle {
  fill: var(--ink);
  stroke: var(--cyan);
  stroke-width: 2.5;
  transition: fill 0.2s ease, stroke 0.2s ease;
}

.page-about .about-map__node:hover circle,
.page-about .about-map__node:focus-visible circle {
  fill: var(--cyan);
  stroke: var(--cyan-hi);
}

.page-about .about-map__name {
  fill: var(--paper);
  font-family: var(--font-head);
  font-size: 16px;
  letter-spacing: 0.04em;
}

.page-about .about-map__role {
  fill: var(--mute);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.02em;
}

/* ---------- 05 赛事版图 ---------- */
.page-about .about-coverage {
  padding: 46px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-coverage__head {
  display: grid;
  gap: 4px;
  margin-bottom: 26px;
}

.page-about .about-coverage__lede {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-ladder {
  display: grid;
  gap: 12px;
  padding: 20px 16px;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  box-shadow: var(--shadow-hard);
}

.page-about .ladder-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 12px;
}

.page-about .ladder-row__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  color: var(--mute);
}

.page-about .ladder-row__bar {
  display: block;
  height: 14px;
  background: var(--ink);
  border: 1.5px solid var(--rule);
  overflow: hidden;
}

.page-about .ladder-row__bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-hi), var(--cyan));
  transition: width 0.3s ease;
}

.page-about .ladder-row__val {
  font-family: var(--font-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--paper);
}

.page-about .ladder-row--3 .ladder-row__bar > span { width: 25%; }
.page-about .ladder-row--6 .ladder-row__bar > span { width: 50%; }
.page-about .ladder-row--9 .ladder-row__bar > span { width: 75%; }
.page-about .ladder-row--12 .ladder-row__bar > span { width: 100%; }

.page-about .about-coverage__notes {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-coverage__note {
  padding-top: 14px;
  border-top: 1.5px solid var(--rule);
}

.page-about .about-coverage__note h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-coverage__note p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--mute);
}

.page-about .about-coverage__note p:last-child {
  margin-bottom: 0;
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-eco {
  padding: 46px 0;
  border-bottom: 1.5px solid var(--rule);
}

.page-about .about-eco__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-eco__body p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.86;
  color: var(--mist);
}

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

.page-about .eco-item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  border-left: 3px solid var(--cyan);
}

.page-about .eco-item--award {
  border-left-color: var(--amber);
}

.page-about .eco-item__num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .eco-item--award .eco-item__num {
  color: var(--amber);
}

.page-about .eco-item__text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-eco__figure {
  margin: 0;
  border: 1.5px solid var(--rule);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 07 下一步 ---------- */
.page-about .about-next {
  padding: 46px 0 56px;
}

.page-about .about-next__cols {
  display: grid;
  gap: 20px;
  margin: 26px 0 30px;
}

.page-about .about-next__col {
  padding: 18px 16px 20px;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-next__col:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.page-about .about-next__head {
  margin: 0 0 10px;
  padding-left: 12px;
  border-left: 3px solid var(--amber);
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-next__col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mute);
}

.page-about .about-next__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .flow-step {
    border-bottom: none;
    border-top: 1.5px solid var(--rule);
    padding: 22px 0;
  }

  .page-about .flow-step:nth-child(odd) {
    padding-right: 32px;
    border-right: 1.5px solid var(--rule);
  }

  .page-about .flow-step:nth-child(even) {
    padding-left: 32px;
  }

  .page-about .about-coverage__notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

@media (min-width: 980px) {
  .page-about .about-hero {
    padding: 40px 0 50px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero__stamp {
    align-items: flex-end;
    text-align: right;
  }

  .page-about .about-hero__cap {
    padding-right: 6px;
  }

  .page-about .about-origin {
    padding: 62px 0;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-journey {
    padding-top: 62px;
  }

  .page-about .about-ms__grid {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 34px;
    padding: 44px 0;
  }

  .page-about .about-ms__stamp {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .page-about .about-flow {
    padding: 62px 0;
  }

  .page-about .about-flow__head,
  .page-about .about-coverage__head,
  .page-about .about-journey__head {
    margin-bottom: 30px;
  }

  .page-about .about-team {
    padding: 62px 0;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-team__figure {
    order: 1;
  }

  .page-about .about-team__body {
    order: 2;
  }

  .page-about .about-coverage {
    padding: 62px 0;
  }

  .page-about .about-ladder {
    padding: 26px 28px;
    gap: 16px;
  }

  .page-about .about-eco {
    padding: 62px 0;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-eco__figure {
    margin-top: 34px;
  }

  .page-about .about-next {
    padding: 62px 0 76px;
  }
}

@media (min-width: 1240px) {
  .page-about .about-hero__lede {
    font-size: 16px;
  }

  .page-about .about-origin__body p,
  .page-about .about-ms__body p,
  .page-about .about-team__body p,
  .page-about .about-eco__body p {
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}