.page-about {
  --ab-card-bg: var(--plate);
  --ab-gap: 26px;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 22px 0 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb-link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--yellow);
}

.page-about .breadcrumb-item [aria-current="page"] {
  color: var(--text-soft);
}

/* ---------- 首屏 ---------- */
.page-about .hero-about {
  position: relative;
  isolation: isolate;
  padding: 26px 0 30px;
}

.page-about .hero-about::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -60px;
  right: -12vw;
  width: 82vw;
  height: 116%;
  background: linear-gradient(158deg, var(--stack) 0%, var(--plate) 52%, rgba(16, 26, 54, 0) 94%);
  clip-path: polygon(16% 0%, 100% 5%, 86% 100%, 0% 86%);
  opacity: .92;
  pointer-events: none;
}

.page-about .hero-about__grid {
  display: grid;
  gap: 28px;
}

.page-about .hero-about h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 10px 0 18px;
  max-width: 16em;
}

.page-about .hero-about .eyebrow {
  letter-spacing: .16em;
  color: var(--yellow);
}

.page-about .hero-about .lead {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  margin: 0;
}

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

.page-about .hero-about__media {
  margin: 0;
}

.page-about .hero-about__media .media-frame {
  aspect-ratio: 16 / 9;
  width: 100%;
  overflow: hidden;
}

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

.page-about .media-note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 规模事实卡 ---------- */
.page-about .about-facts {
  padding: 6px 0 4px;
}

.page-about .fact-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .fact-card {
  position: relative;
  background: var(--ab-card-bg);
  border: 1px solid var(--line);
  padding: 16px 15px 18px;
  box-shadow: var(--shadow-panel);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .fact-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 2px;
  background: var(--yellow);
}

.page-about .fact-card:hover {
  transform: translateY(-4px);
  border-color: var(--yellow);
}

.page-about .fact-card__num {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  font-size: 28px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .fact-card__unit {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0;
}

.page-about .fact-card__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 章节题头 ---------- */
.page-about .about-head {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-bottom: 18px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-head__num {
  font-size: 13px;
  line-height: 1.9;
  color: var(--yellow);
  letter-spacing: .06em;
}

.page-about .about-head .eyebrow {
  margin: 0 0 8px;
  letter-spacing: .16em;
  color: var(--muted);
  font-size: 12px;
}

.page-about .about-head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.32;
  color: var(--white);
  letter-spacing: -.01em;
  max-width: 22em;
}

.page-about .prose {
  max-width: 34em;
}

.page-about .prose > * + * {
  margin-top: 18px;
}

.page-about .prose p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
  margin: 0;
}

/* ---------- 分类板块 ---------- */
.page-about .taxonomy-body {
  display: grid;
  gap: 28px;
}

.page-about .sport-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .sport-chip {
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: var(--plate);
  padding: 13px 14px;
  font-size: 15px;
  color: var(--white);
}

.page-about .sport-chip__num {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}

/* ---------- 编辑部板块 ---------- */
.page-about .newsroom-grid {
  display: grid;
  gap: 26px;
  margin-bottom: 30px;
}

.page-about .newsroom-media {
  margin: 0;
}

.page-about .newsroom-media .media-frame {
  aspect-ratio: 3 / 2;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .workflow {
  display: grid;
  gap: 14px;
}

.page-about .workflow__item {
  position: relative;
  background: var(--plate);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  padding: 20px 18px 22px;
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .workflow__item:hover {
  transform: translateY(-4px);
  border-color: var(--line);
  border-left-color: var(--yellow);
}

.page-about .workflow__num {
  display: block;
  font-size: 13px;
  color: var(--yellow);
  letter-spacing: .08em;
  margin-bottom: 10px;
}

.page-about .workflow__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .workflow__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 迭代折叠卡 ---------- */
.page-about .iter-list {
  display: grid;
  gap: 12px;
}

.page-about .iter {
  position: relative;
  background: var(--plate);
  border: 1px solid var(--line);
  transition: border-color .3s var(--ease);
}

.page-about .iter:hover {
  border-color: var(--line);
}

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

.page-about .iter__summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 6px 12px;
  align-items: baseline;
  padding: 16px 16px 16px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .iter__summary:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: -2px;
}

.page-about .iter__num {
  font-size: 13px;
  color: var(--yellow);
  letter-spacing: .1em;
}

.page-about .iter__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.5;
  color: var(--white);
}

.page-about .iter__phase {
  grid-column: 2 / -1;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .iter__flag {
  position: absolute;
  top: 12px;
  right: 12px;
  display: none;
}

.page-about .iter[open] .iter__flag {
  display: inline-flex;
}

.page-about .iter__body {
  padding: 0 18px 20px 60px;
}

.page-about .iter__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 数据合作 ---------- */
.page-about .supply-chain {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: supply;
}

.page-about .supply-step {
  position: relative;
  background: var(--stack);
  border: 1px solid var(--line);
  padding: 22px 18px 24px;
}

.page-about .supply-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--sky);
  opacity: .7;
}

.page-about .supply-step__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--night);
  background: var(--sky);
  padding: 3px 8px;
  margin-bottom: 14px;
}

.page-about .supply-step__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .supply-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 赛季时间线 ---------- */
.page-about .track-wrap {
  display: grid;
  gap: 28px;
}

.page-about .season-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: grid;
  gap: 22px;
}

.page-about .season-track::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .season-node {
  position: relative;
}

.page-about .season-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--night);
  border: 1px solid var(--yellow);
  transform: rotate(45deg);
}

.page-about .season-node__phase {
  display: block;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--yellow);
  margin-bottom: 6px;
}

.page-about .season-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
  max-width: 30em;
}

.page-about .track-media {
  margin: 0;
}

.page-about .track-media .media-frame {
  aspect-ratio: 4 / 5;
  width: 100%;
  max-width: 340px;
  overflow: hidden;
  border: 1px solid var(--line);
}

/* ---------- 浅色纸面板 ---------- */
.page-about .next-panel {
  padding: 30px 20px 32px;
  color: var(--night);
}

.page-about .next-panel__eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: #6B7B9E;
}

.page-about .next-panel__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1.3;
  color: var(--night);
  letter-spacing: -.01em;
}

.page-about .next-list {
  display: grid;
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .next-item {
  border-top: 1px solid rgba(10, 16, 36, .16);
  padding-top: 16px;
}

.page-about .next-item__num {
  display: block;
  font-size: 12px;
  letter-spacing: .12em;
  color: #8A6A12;
  margin-bottom: 8px;
}

.page-about .next-item__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.42;
  color: var(--night);
}

.page-about .next-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #33405E;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .fact-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

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

  .page-about .next-panel {
    padding: 36px 30px 40px;
  }
}

@media (min-width: 880px) {
  .page-about .hero-about {
    padding: 36px 0 48px;
  }

  .page-about .hero-about__grid {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
    align-items: end;
  }

  .page-about .taxonomy-body {
    grid-template-columns: 7fr 5fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .newsroom-grid {
    grid-template-columns: 6fr 6fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .workflow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .iter__summary {
    grid-template-columns: 34px minmax(0, 1fr) auto;
    align-items: center;
    padding: 18px 22px 18px 16px;
  }

  .page-about .iter__phase {
    grid-column: 3 / 4;
    margin-left: 18px;
    white-space: nowrap;
  }

  .page-about .iter__body {
    padding: 0 74px 24px 62px;
  }

  .page-about .supply-chain {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .track-wrap {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 46px;
    align-items: start;
  }

  .page-about .season-track {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    grid-auto-rows: minmax(0, auto);
    gap: 14px;
    padding: 40px 0 0;
  }

  .page-about .season-track::before {
    left: 0;
    right: 0;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 1px;
  }

  .page-about .season-node::before {
    left: 0;
    top: -22px;
  }

  .page-about .season-node__phase {
    font-size: 11px;
    letter-spacing: .06em;
  }

  .page-about .season-node__text {
    font-size: 14px;
    line-height: 1.78;
  }

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

@media (min-width: 1180px) {
  .page-about .hero-about h1 {
    max-width: 14em;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .fact-card,
  .page-about .workflow__item,
  .page-about .iter,
  .page-about .season-node::before {
    transition: none;
  }

  .page-about .fact-card:hover,
  .page-about .workflow__item:hover {
    transform: none;
  }
}