.page-about {
  --ab-gutter: clamp(16px, 4vw, 40px);
  --ab-gap: clamp(20px, 3vw, 36px);
  --ab-pad-y: clamp(28px, 5vw, 56px);
  display: block;
  background:
    radial-gradient(1100px 560px at 82% -10%, rgba(57, 230, 208, .10), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  color: var(--text);
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow-x: clip;
}

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

.page-about .media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(11, 43, 38, .6);
  line-height: 0;
}

.page-about .media__cap {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-dim);
  margin-top: 10px;
}

.page-about .ab-hero,
.page-about .ab-track,
.page-about .ab-team,
.page-about .ab-leagues,
.page-about .ab-cases,
.page-about .ab-eco {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding-left: var(--ab-gutter);
  padding-right: var(--ab-gutter);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: var(--ab-pad-y);
  padding-bottom: clamp(24px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__copy {
  min-width: 0;
}

.page-about .ab-hero__copy .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 18px;
}

.page-about .ab-hero__copy .crumbs a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .ab-hero__copy .crumbs__sep {
  color: var(--clay);
}

.page-about .ab-hero__copy .crumbs__current {
  color: var(--paper);
}

.page-about .ab-hero__copy .eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .ab-hero__copy h1 {
  font-size: clamp(28px, 5.6vw, 54px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.012em;
  color: var(--paper);
  margin: 0 0 20px;
  max-width: 22ch;
}

.page-about .ab-hero__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0 0 26px;
  max-width: 58ch;
}

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

/* ---------- 关键数据面板 ---------- */
.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: clamp(18px, 3vw, 26px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 18px;
  background: rgba(11, 43, 38, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  min-width: 0;
}

.page-about .ab-facts__item {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.page-about .ab-facts__item:nth-child(1),
.page-about .ab-facts__item:nth-child(2) {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.05;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .ab-facts__num em {
  font-style: normal;
  font-size: .58em;
  margin-left: 2px;
  color: var(--clay);
}

.page-about .ab-facts__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------- 章节标题组 ---------- */
.page-about .ab-sechead {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 34px);
  max-width: 64ch;
}

.page-about .ab-sechead .eyebrow {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--clay);
  margin: 0;
}

.page-about .ab-sechead h2 {
  font-size: clamp(22px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0;
}

.page-about .ab-sechead__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-track {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-track__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

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

.page-about .ab-track__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), var(--line));
}

.page-about .ab-track__item {
  position: relative;
  padding: 0 0 28px;
}

.page-about .ab-track__item:last-child {
  padding-bottom: 0;
}

.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--clay);
  box-shadow: 0 0 0 4px rgba(184, 111, 82, .12);
}

.page-about .ab-track__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--clay);
  margin-bottom: 6px;
}

.page-about .ab-track__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .ab-track__item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  margin: 0;
}

.page-about .ab-track__media {
  margin: 0;
}

/* ---------- 内容与数据团队 ---------- */
.page-about .ab-team {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
  align-items: start;
}

.page-about .ab-team__media {
  margin: 0;
}

.page-about .ab-team__copy p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0 0 22px;
}

.page-about .ab-checks {
  display: grid;
  gap: 10px;
}

.page-about .ab-checks__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(18, 74, 61, .38);
  border: 1px solid var(--line);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ab-checks__item:hover,
.page-about .ab-checks__item:focus-within {
  border-color: var(--cyan-dim);
  transform: translateX(4px);
}

.page-about .ab-checks__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
  padding: 4px 8px;
  border-radius: var(--pill);
  background: rgba(57, 230, 208, .1);
  border: 1px solid rgba(57, 230, 208, .24);
}

.page-about .ab-checks__body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.page-about .ab-checks__body strong {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-checks__body span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 联赛覆盖 ---------- */
.page-about .ab-leagues {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-leagues__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-league {
  position: relative;
  padding: 22px 22px 20px;
  border-radius: var(--radius-md);
  background: rgba(11, 43, 38, .6);
  border: 1px solid var(--line);
  border-top: 3px solid var(--clay);
  display: grid;
  gap: 10px;
  align-content: start;
  transition: transform .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .ab-league:hover,
.page-about .ab-league:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan-dim);
  background: rgba(18, 74, 61, .5);
}

.page-about .ab-league--epl { border-top-color: var(--cyan); }
.page-about .ab-league--laliga { border-top-color: var(--flare); }
.page-about .ab-league--bundes { border-top-color: var(--lime); }
.page-about .ab-league--seriea { border-top-color: var(--clay); }
.page-about .ab-league--ligue1 { border-top-color: var(--stone); }
.page-about .ab-league--rhythm { border-top-color: var(--cyan); background: rgba(7, 21, 18, .78); }

.page-about .ab-league__name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--paper);
  margin: 0;
}

.page-about .ab-league__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0;
}

.page-about .ab-league .btn {
  justify-self: start;
  margin-top: 6px;
}

/* ---------- iOS 端案例合集 ---------- */
.page-about .ab-cases {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-cases__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

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

.page-about .ab-case {
  display: grid;
  gap: 6px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--cyan);
  background: rgba(18, 74, 61, .3);
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-case:hover,
.page-about .ab-case:focus-within {
  background: rgba(18, 74, 61, .52);
  border-left-color: var(--lime);
}

.page-about .ab-case strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-case span {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .ab-cases__media {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  padding-top: clamp(40px, 6vw, 76px);
}

.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-about .ab-eco__lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
  margin: 0;
  padding-left: 18px;
  border-left: 2px solid var(--clay);
}

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

.page-about .ab-eco__list li {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-eco__list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-eco__list strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .ab-eco__list span {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .ab-eco__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .ab-leagues__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-eco__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
  }

  .page-about .ab-eco__list li:nth-child(1),
  .page-about .ab-eco__list li:nth-child(2) {
    border-top: 0;
  }

  .page-about .ab-eco__list li:nth-child(2) {
    border-bottom: 1px solid var(--line);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, 1fr);
    align-items: start;
    column-gap: clamp(28px, 4vw, 60px);
  }

  .page-about .ab-hero__copy h1 {
    max-width: 20ch;
  }

  .page-about .ab-track__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, 360px);
    align-items: start;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  }

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

  .page-about .ab-cases__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: center;
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-league,
  .page-about .ab-checks__item,
  .page-about .ab-case {
    transition: none;
  }

  .page-about .ab-league:hover,
  .page-about .ab-league:focus-within,
  .page-about .ab-checks__item:hover,
  .page-about .ab-checks__item:focus-within {
    transform: none;
  }
}