.page-about {
  background: var(--abyss);
  color: var(--mist);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--mossgray);
}

.page-about .about-hero::after {
  content: "";
  display: block;
  height: 10px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--mossgray) 0 1px,
    transparent 1px 26px
  );
  opacity: 0.85;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding: 32px 0 40px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 6.2vw, 74px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 62ch;
}

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

.page-about .about-hero__pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--mossgray);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--board);
}

.page-about .about-hero__col {
  padding: 20px 20px 22px;
}

.page-about .about-hero__col--a {
  border-bottom: 1px solid var(--mossgray);
}

.page-about .about-hero__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .about-hero__col--a .about-hero__tag {
  color: var(--orange);
}

.page-about .about-hero__col--b .about-hero__tag {
  color: var(--cyan);
}

.page-about .about-hero__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-hero__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-hero__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 6px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 16px 0 18px;
  border-bottom: 1px solid var(--mossgray);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--mossgray);
  border-radius: var(--r-pill);
  font-size: 13px;
  color: var(--lime);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--mist);
  border-color: var(--orange);
}

.page-about .about-index .num {
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 56px 0 0;
  margin-top: 56px;
  border-top: 1px solid var(--mossgray);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-chapter__num {
  font-size: 40px;
  line-height: 1;
  font-weight: 800;
  color: var(--mossgray);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1px var(--mossgray);
  }
}

.page-about .about-chapter__title {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-chapter__body > h2 {
  margin: 0 0 18px;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .about-chapter__body p {
  max-width: 70ch;
  color: var(--mist);
  line-height: 1.75;
  margin: 0 0 16px;
}

.page-about .about-chapter__body h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--mist);
}

/* ---------- 两版并排 ---------- */
.page-about .about-versus {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 28px;
  border: 1px solid var(--mossgray);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--board);
}

.page-about .about-versus__side {
  padding: 22px 20px 24px;
}

.page-about .about-versus__side--a {
  border-bottom: 1px solid var(--mossgray);
}

.page-about .about-versus__tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.page-about .about-versus__side--a .about-versus__tag {
  color: var(--orange);
}

.page-about .about-versus__side--b .about-versus__tag {
  color: var(--cyan);
}

.page-about .about-versus__side--a::before,
.page-about .about-versus__side--b::before {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  border-radius: var(--r-pill);
  margin-bottom: 16px;
}

.page-about .about-versus__side--a::before {
  background: var(--orange);
}

.page-about .about-versus__side--b::before {
  background: var(--cyan);
}

.page-about .about-versus__text {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--mist);
  line-height: 1.7;
}

.page-about .about-versus__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-versus__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--lime);
  line-height: 1.6;
}

.page-about .about-versus__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 1px;
  background: var(--mossgray);
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 6px 0 26px;
  border-top: 1px solid var(--mossgray);
  border-bottom: 1px solid var(--mossgray);
  background: linear-gradient(180deg, var(--pine), var(--abyss));
}

.page-about .about-band__cell {
  padding: 24px 4px 24px 0;
  border-bottom: 1px solid var(--mossgray);
}

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

.page-about .about-band__figure {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
}

.page-about .about-band__num {
  display: inline-block;
  font-size: clamp(44px, 7vw, 76px);
  line-height: 1;
  font-weight: 800;
  color: var(--orange);
  background: var(--mud);
  border-radius: var(--r-sm);
  padding: 2px 12px;
}

.page-about .about-band__unit {
  font-size: 15px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .about-band__text {
  margin: 0;
  max-width: 34ch;
  font-size: 14.5px;
  color: var(--lime);
  line-height: 1.7;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 40px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--mossgray);
}

.page-about .about-figure--square {
  margin-top: 20px;
}

/* ---------- 四条路径 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  counter-reset: step;
}

.page-about .about-steps__item {
  padding: 20px 20px 22px;
  border: 1px solid var(--mossgray);
  border-radius: var(--r-md);
  background: var(--board);
}

.page-about .about-steps__idx {
  display: block;
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-steps__item p {
  margin: 0;
  font-size: 14.5px;
  color: var(--lime);
  line-height: 1.7;
}

/* ---------- 赛季四阶段 ---------- */
.page-about .about-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 26px 0 0;
  background: var(--mossgray);
  border: 1px solid var(--mossgray);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-phases__item {
  background: var(--abyss);
  padding: 20px 18px 22px;
}

.page-about .about-phases__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-phases__item p {
  margin: 0;
  font-size: 14.5px;
  color: var(--lime);
  line-height: 1.7;
}

.page-about .about-keep {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 30px;
}

.page-about .about-keep__block {
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-keep__block:nth-child(2) {
  border-left-color: var(--orange);
}

.page-about .about-keep__block p {
  margin: 0;
  font-size: 15px;
  color: var(--lime);
  line-height: 1.75;
  max-width: 56ch;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: 26px;
}

.page-about .about-timeline__scroll {
  overflow-x: auto;
  padding-bottom: 14px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__scroll:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 4px;
  border-radius: var(--r-sm);
}

.page-about .about-timeline__track {
  display: flex;
  min-width: 880px;
  padding: 6px 0 4px;
}

.page-about .about-node {
  flex: 0 0 220px;
  padding-right: 32px;
  cursor: default;
}

.page-about .about-node__year {
  display: block;
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  color: var(--mist);
}

.page-about .about-node__rail {
  position: relative;
  display: block;
  height: 1px;
  margin: 16px 0 20px;
  background: var(--mossgray);
}

.page-about .about-node__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: -5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--orange);
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-node:hover .about-node__rail::before,
.page-about .about-node:focus-within .about-node__rail::before,
.page-about .about-node:focus .about-node__rail::before {
  background: var(--orange);
}

.page-about .about-node__title {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
  color: var(--mist);
}

.page-about .about-node__body {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  color: var(--lime);
  line-height: 1.7;
  transition: max-height var(--t-mid) var(--ease), opacity var(--t-mid) var(--ease), margin-top var(--t-mid) var(--ease);
}

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

.page-about .about-figure--band {
  margin-top: 32px;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 4px;
}

.page-about .about-team__main p {
  margin: 0 0 16px;
  font-size: 15.5px;
  color: var(--mist);
  line-height: 1.78;
  max-width: 64ch;
}

.page-about .about-team__stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__stats li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14.5px;
  color: var(--lime);
}

.page-about .about-team__num {
  display: inline-block;
  min-width: 62px;
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
  color: var(--cyan);
  background: var(--board);
  border-radius: var(--r-sm);
  padding: 4px 10px;
  text-align: center;
}

.page-about .about-net-wrap {
  border: 1px solid var(--mossgray);
  border-radius: var(--r-lg);
  background: var(--board);
  padding: 20px;
}

.page-about .about-net {
  display: block;
  width: 100%;
  max-width: 360px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-net__node line {
  stroke: var(--mossgray);
  stroke-width: 1;
  transition: stroke var(--t-fast) var(--ease), stroke-width var(--t-fast) var(--ease);
}

.page-about .about-net__node circle {
  fill: var(--board);
  stroke: var(--cyan);
  stroke-width: 1.6;
  transition: fill var(--t-fast) var(--ease), stroke var(--t-fast) var(--ease);
}

.page-about .about-net__node:hover line {
  stroke: var(--orange);
  stroke-width: 2;
}

.page-about .about-net__node:hover circle {
  fill: var(--orange);
  stroke: var(--orange);
}

.page-about .about-net__hub {
  fill: var(--pine);
  stroke: var(--orange);
  stroke-width: 2;
}

.page-about .about-net__label {
  fill: var(--mist);
  font-family: var(--font-sans);
  font-size: 13px;
  text-anchor: middle;
}

.page-about .about-net__note {
  margin: 16px 0 0;
  font-size: 13.5px;
  color: var(--lime);
  line-height: 1.7;
  text-align: center;
}

/* ---------- 继续了解 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 8px;
}

.page-about .about-next__card {
  display: block;
  padding: 24px 22px 26px;
  border: 1px solid var(--mossgray);
  border-radius: var(--r-lg);
  background: var(--board);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .about-next__card--a {
  border-top: 3px solid var(--orange);
}

.page-about .about-next__card--b {
  border-top: 3px solid var(--cyan);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-next__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sand);
  margin-bottom: 12px;
}

.page-about .about-next__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.page-about .about-next__card p {
  margin: 0 0 16px;
  font-size: 14.5px;
  color: var(--lime);
  line-height: 1.72;
}

.page-about .about-next__go {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--orange);
  border-bottom: 1px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .about-next__back {
  margin-top: 26px;
  font-size: 14.5px;
}

.page-about .about-next__back a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--mossgray);
  padding-bottom: 2px;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__pair {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-hero__col--a {
    border-bottom: 0;
    border-right: 1px solid var(--mossgray);
  }

  .page-about .about-band__cell {
    padding: 28px 24px 30px;
  }

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

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

  .page-about .about-keep {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    padding: 52px 0 60px;
  }

  .page-about .about-chapter {
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 44px;
    padding-top: 72px;
    margin-top: 72px;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: center;
    gap: 18px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-chapter__num {
    font-size: 52px;
  }

  .page-about .about-chapter__title {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
  }

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

  .page-about .about-versus__side {
    padding: 28px 28px 30px;
  }

  .page-about .about-versus__side--a {
    border-bottom: 0;
    border-right: 1px solid var(--mossgray);
  }

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

  .page-about .about-band__cell {
    border-bottom: 0;
    border-right: 1px solid var(--mossgray);
  }

  .page-about .about-band__cell:last-child {
    border-right: 0;
  }

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

  .page-about .about-steps__item {
    border-radius: 0;
    border-right-width: 0;
  }

  .page-about .about-steps__item:first-child {
    border-radius: var(--r-md) 0 0 var(--r-md);
  }

  .page-about .about-steps__item:last-child {
    border-radius: 0 var(--r-md) var(--r-md) 0;
    border-right-width: 1px;
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

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

  /* 时间轴横贯整页 */
  .page-about .about-chapter--wide {
    grid-template-columns: 80px minmax(0, 1fr);
  }

  .page-about .about-chapter--wide .about-timeline,
  .page-about .about-chapter--wide .about-figure--band {
    grid-column: 1 / -1;
  }

  .page-about .about-timeline__track {
    min-width: 1080px;
  }

  .page-about .about-node {
    flex: 1 1 0;
    min-width: 200px;
    padding-right: 40px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    max-width: 15ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-node__body,
  .page-about .about-node__rail::before {
    transition: none;
  }

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