.page-about {
  --about-y: clamp(3rem, 7vw, 5.5rem);
  --about-gap: clamp(1rem, 2.5vw, 1.75rem);
  display: block;
  background: var(--paper);
  color: var(--text);
}

.page-about .crumb {
  padding-top: clamp(1rem, 3vw, 1.75rem);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  padding: clamp(1.75rem, 5vw, 3.5rem);
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-deep) 70%, var(--pitch) 140%);
  color: var(--paper);
  box-shadow: 0 24px 60px -32px rgba(6, 25, 19, .6);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  background: repeating-linear-gradient(90deg,
      rgba(53, 240, 200, .55) 0 1px,
      transparent 1px 26px);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -35%;
  width: 46%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(53, 240, 200, .16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__badge {
  position: absolute;
  top: clamp(1.5rem, 4vw, 2.5rem);
  right: clamp(1.5rem, 4vw, 2.5rem);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink-deep);
  background: var(--signal);
  border-radius: var(--r-pill);
  padding: .35rem .95rem;
  white-space: nowrap;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 clamp(1rem, 3vw, 1.75rem);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: .18em;
  color: rgba(242, 244, 241, .62);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(1rem, 3vw, 1.5rem);
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 18ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--signal);
  position: relative;
  display: inline-block;
}

.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.06em;
  height: .08em;
  background: var(--amber);
  border-radius: 999px;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(242, 244, 241, .84);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(.75rem, 2vw, 1.25rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid rgba(242, 244, 241, .16);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  gap: .75rem;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
  letter-spacing: -0.02em;
}

.page-about .about-hero__lb {
  font-size: var(--fs-small);
  color: rgba(242, 244, 241, .72);
  letter-spacing: .02em;
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding: var(--about-y) 0;
}

.page-about .about-head {
  max-width: 62ch;
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-head h2 {
  margin: 0 0 .85rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.22;
}

.page-about .about-head p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: .2em;
  color: var(--teal);
  padding-inline-start: .6rem;
  border-inline-start: 2px solid var(--signal);
  align-self: flex-start;
  margin: 0;
}

.page-about .about-why h2,
.page-about .about-guizhou h2 {
  margin: .6rem 0 1rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.22;
}

.page-about .about-why__body p,
.page-about .about-guizhou__side p,
.page-about .about-guizhou__body p {
  margin: 0 0 1rem;
  line-height: 1.75;
}

/* ---------- 为什么用比赛日 ---------- */

.page-about .about-why {
  background: var(--paper);
}

.page-about .about-why__side {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: clamp(.9rem, 2vw, 1.4rem);
  margin-bottom: var(--about-gap);
}

.page-about .about-why__side .media-frame {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-why__list {
  list-style: none;
  margin: 1.5rem 0 1.25rem;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-why__list li {
  padding: .9rem 0;
  border-bottom: 1px solid var(--rule);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-why__list b {
  display: inline-block;
  min-width: 4.5em;
  color: var(--teal);
  font-weight: 700;
}

.page-about .about-why__tail {
  padding: 1rem 0 0;
  border-top: 2px solid var(--ink);
  color: var(--text);
  font-weight: 500;
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  background: var(--paper);
  border-top: 1px solid var(--rule);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(.75rem, 2vw, 1rem);
}

.page-about .about-team__card {
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background: #fff;
  padding: clamp(1rem, 2.5vw, 1.4rem);
  transition: border-color .24s ease, transform .24s ease, box-shadow .24s ease;
}

.page-about .about-team__card:hover {
  border-color: var(--signal);
  transform: translateY(-4px);
  box-shadow: 0 18px 36px -26px rgba(12, 46, 34, .5);
}

.page-about .about-team__card[open] {
  border-color: var(--teal);
}

.page-about .about-team__card summary {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: .85rem;
  cursor: pointer;
}

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

.page-about .about-team__name {
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--muted);
  letter-spacing: .04em;
  white-space: nowrap;
}

.page-about .about-team__count b {
  font-size: 1.35rem;
  color: var(--teal);
  margin-inline-end: .15rem;
}

.page-about .about-team__mark {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  border: 1px solid var(--rule);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: .95rem;
  line-height: 1;
  color: var(--teal);
  flex: none;
}

.page-about .about-team__mark::before {
  content: "+";
}

.page-about .about-team__card[open] .about-team__mark::before {
  content: "\2013";
}

.page-about .about-team__card[open] .about-team__mark {
  background: var(--mist);
  border-color: var(--teal);
}

.page-about .about-team__body {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--rule);
}

.page-about .about-team__body p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 五个环节 ---------- */

.page-about .about-flow {
  background: linear-gradient(180deg, var(--paper) 0%, #E9EDE8 100%);
}

.page-about .about-flow__intro h2 {
  margin: .6rem 0 1rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-flow__intro p {
  margin: 0 0 1.5rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-flow__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .about-flow__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(.85rem, 2.5vw, 1.5rem);
  align-items: start;
  padding: clamp(1rem, 2.5vw, 1.35rem) 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-flow__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--amber);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .about-flow__item h3 {
  margin: 0 0 .4rem;
  font-size: var(--fs-h3);
  font-weight: 800;
}

.page-about .about-flow__item p {
  margin: 0;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 统计口径 ---------- */

.page-about .about-standards {
  background: var(--paper);
}

.page-about .about-standards__board {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  padding: clamp(1.75rem, 5vw, 3.5rem);
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--paper);
}

.page-about .about-standards__board::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg,
      rgba(255, 255, 255, .035) 0 6%,
      transparent 6% 12%);
  pointer-events: none;
}

.page-about .about-standards__board > * {
  position: relative;
}

.page-about .about-standards__eyebrow {
  color: var(--signal);
}

.page-about .about-standards__board h2 {
  margin: .6rem 0 1rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-standards__lead {
  max-width: 60ch;
  margin: 0 0 clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.75;
  color: rgba(242, 244, 241, .82);
}

.page-about .about-standards__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid rgba(242, 244, 241, .18);
  padding-top: clamp(1.5rem, 4vw, 2rem);
}

.page-about .about-standards__col h3 {
  margin: 0 0 .75rem;
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--signal);
}

.page-about .about-standards__col p {
  margin: 0 0 1.25rem;
  line-height: 1.75;
  color: rgba(242, 244, 241, .78);
}

.page-about .about-standards .stat__label {
  color: rgba(242, 244, 241, .62);
}

.page-about .about-standards__tags {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* ---------- 赛季阶段 ---------- */

.page-about .about-stages {
  background: var(--paper);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0 0 clamp(2rem, 5vw, 3rem);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1rem, 3vw, 1.5rem);
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--signal) 0%, var(--amber) 100%);
  opacity: .85;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__link {
  display: block;
  padding-top: 1.6rem;
  text-decoration: none;
  color: inherit;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 2px;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--ink);
  transition: border-color .2s ease, background .2s ease;
}

.page-about .about-timeline__link:hover .about-timeline__dot,
.page-about .about-timeline__link:focus-visible .about-timeline__dot {
  border-color: var(--amber);
  background: var(--amber);
}

.page-about .about-timeline__season {
  display: block;
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-timeline__note {
  display: block;
  margin-top: .3rem;
  font-size: var(--fs-small);
  color: var(--muted);
  line-height: 1.5;
}

.page-about .about-stages__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-stage {
  padding: clamp(1.15rem, 3vw, 1.6rem);
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--rule);
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

.page-about .about-stage__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: .06em;
  color: var(--teal);
  background: var(--mist);
  border-radius: var(--r-pill);
  padding: .28rem .8rem;
  margin-bottom: .85rem;
}

.page-about .about-stage h3 {
  margin: 0 0 .6rem;
  font-size: var(--fs-h3);
  font-weight: 800;
}

.page-about .about-stage p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-stages__figure {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: center;
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-top: clamp(1.75rem, 4vw, 2.5rem);
  border-top: 1px solid var(--rule);
}

.page-about .about-stages__caption h3 {
  margin: 0 0 .7rem;
  font-size: var(--fs-h3);
  font-weight: 800;
}

.page-about .about-stages__caption p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 数据来源 ---------- */

.page-about .about-sources {
  background: linear-gradient(180deg, #E9EDE8 0%, var(--paper) 100%);
}

.page-about .about-sources__inner h2 {
  margin: .6rem 0 1rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-sources__inner > p {
  margin: 0 0 1rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-sources__stats {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  padding-top: clamp(1.5rem, 4vw, 2rem);
  border-top: 2px solid var(--ink);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 贵州 ---------- */

.page-about .about-guizhou {
  background: var(--paper);
  border-top: 1px solid var(--rule);
}

.page-about .about-guizhou__side {
  margin-bottom: var(--about-gap);
}

.page-about .about-guizhou__lead {
  font-size: 1.05rem;
  color: var(--text);
}

.page-about .about-guizhou__list {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-guizhou__list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-guizhou__list h3 {
  margin: 0 0 .35rem;
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-guizhou__list p {
  margin: 0;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-guizhou__links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 结尾引导 ---------- */

.page-about .about-next {
  background: var(--paper);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-next__panel {
  border-radius: var(--r-lg);
  padding: clamp(1.75rem, 5vw, 3rem);
  background: var(--ink);
  color: var(--paper);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  align-items: center;
  position: relative;
  overflow: hidden;
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--signal), var(--amber));
}

.page-about .about-next__text h2 {
  margin: 0 0 .8rem;
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.22;
}

.page-about .about-next__text p {
  margin: 0;
  line-height: 1.75;
  color: rgba(242, 244, 241, .82);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-next .btn--ghost {
  color: var(--paper);
  border-color: rgba(242, 244, 241, .5);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-hero__fact {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
  }

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

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

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

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

  .page-about .about-stages__figure {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: 1.35fr 1fr 1.15fr 1fr;
  }

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

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

  .page-about .about-why__side {
    margin-bottom: 0;
  }

  .page-about .about-guizhou__side {
    margin-bottom: 0;
  }

  .page-about .about-next__panel {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }

  .page-about .about-next__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-timeline__dot {
    transition: none;
  }

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