.page-about {
  --ab-radius: 16px;
  --ab-panel: rgba(255, 255, 255, .05);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gray-500);
  margin-bottom: clamp(14px, 2.4vw, 22px);
}
.page-about .breadcrumb a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--cyan-300);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 62px) 0 clamp(30px, 5vw, 66px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(18, 224, 176, .14), transparent 58%),
    linear-gradient(168deg, var(--ink-800) 0%, var(--ink-900) 62%);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .045) 0 1px, transparent 1px 74px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .045) 0 1px, transparent 1px 74px);
  opacity: .8;
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .ab-hero__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-about .ab-hero__title {
  margin: 10px 0 0;
  max-width: 20ch;
  color: var(--white);
}
.page-about .ab-hero__lead {
  margin-top: clamp(14px, 2vw, 22px);
  max-width: 46ch;
  color: var(--mist);
}
.page-about .ab-hero__stats {
  margin-top: clamp(22px, 3.4vw, 36px);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(88px, 1fr));
  gap: 14px;
  width: 100%;
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-hero__media {
  position: relative;
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}
.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .ab-hero__badge {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(6, 43, 35, .82);
  backdrop-filter: blur(6px);
}
.page-about .ab-hero__badge .t-mono {
  color: var(--cyan-300);
  font-size: 11px;
  letter-spacing: .14em;
}
.page-about .ab-hero__badge-strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

/* 主体布局 */
.page-about .ab-layout {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(36px, 6vw, 76px);
  padding-bottom: clamp(48px, 7vw, 96px);
}
.page-about .ab-main {
  min-width: 0;
}
.page-about .ab-side {
  min-width: 0;
  display: grid;
  gap: 22px;
  align-content: start;
  order: -1;
}

/* 目录 */
.page-about .ab-toc {
  padding: 16px 18px;
  border-radius: var(--ab-radius);
  border: 1px solid var(--line-soft);
  background: var(--ab-panel);
}
.page-about .ab-toc__title {
  margin: 0 0 12px;
  color: var(--gray-500);
}
.page-about .ab-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 4px 14px;
}
.page-about .ab-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}
.page-about .ab-toc__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan-500);
}
.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--cyan-300);
}
.page-about .ab-side__facts {
  padding: 14px 18px;
  border-radius: var(--ab-radius);
  border: 1px dashed var(--line-soft);
}
.page-about .ab-side__facts .t-label {
  margin: 0 0 6px;
  color: var(--gold-400);
}
.page-about .ab-side__facts .t-mono {
  margin: 0;
  font-size: 12px;
  line-height: 1.9;
  color: var(--mist);
}

/* 章节骨架 */
.page-about .ab-chapter {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(30px, 5vw, 58px);
}
.page-about .ab-chapter + .ab-chapter {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(30px, 5vw, 58px);
}
.page-about .chapter {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 62px);
  line-height: .92;
  letter-spacing: .02em;
  color: var(--cyan-500);
}
.page-about .chapter__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gold-400);
}
.page-about .chapter__title {
  margin: 0;
  color: var(--white);
}
.page-about .ab-chapter__body {
  min-width: 0;
  display: grid;
  gap: 16px;
}
.page-about .ab-chapter__body .t-body {
  margin: 0;
  color: var(--mist);
  max-width: 62ch;
}
.page-about .ab-chapter__closing {
  padding-left: 16px;
  border-left: 2px solid var(--cyan-500);
  color: var(--white) !important;
  font-weight: 500;
}
.page-about .ab-link {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(107, 255, 208, .4);
  transition: color .3s var(--ease), border-color .3s var(--ease);
}
.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 横图 */
.page-about .ab-banner {
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}
.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 联赛网格 */
.page-about .ab-leagues {
  list-style: none;
  margin: 4px 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--ab-radius);
  overflow: hidden;
}
.page-about .ab-leagues li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 14px;
  background: var(--ink-900);
  transition: background .3s var(--ease);
}
.page-about .ab-leagues li:hover {
  background: var(--ink-800);
}
.page-about .ab-leagues__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray-500);
}
.page-about .ab-leagues__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

/* 表格补充 */
.page-about .table caption {
  text-align: left;
  padding-bottom: 10px;
  color: var(--gray-500);
}

/* 折叠说明 */
.page-about .fold {
  margin-top: 4px;
  border-left: 2px solid var(--line);
  padding-left: 14px;
}
.page-about .fold__panel {
  margin-top: 10px;
}
.page-about .fold__panel .t-note {
  margin: 0;
  color: var(--gray-500);
  line-height: 1.9;
}

/* 斜切分割 */
.page-about .slash {
  height: 2px;
  margin: clamp(6px, 2vw, 18px) 0 clamp(24px, 4vw, 42px);
  background: linear-gradient(90deg, var(--orange-500), rgba(255, 90, 31, .05));
  transform: skewY(-1.2deg);
}

/* 团队卡片 */
.page-about .ab-team {
  list-style: none;
  margin: 4px 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .ab-team__card {
  position: relative;
  padding: 20px 18px;
  border-radius: var(--ab-radius);
  border: 1px solid var(--line-soft);
  background: var(--ab-panel);
  transition: border-color .35s var(--ease), transform .35s var(--ease), background .35s var(--ease);
}
.page-about .ab-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 44px;
  height: 3px;
  background: var(--orange-500);
  border-radius: 0 0 3px 3px;
}
.page-about .ab-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1;
  color: var(--white);
}
.page-about .ab-team__role {
  margin: 8px 0 10px;
  font-size: 18px;
  color: var(--cyan-300);
}
.page-about .ab-team__duty,
.page-about .ab-team__extra {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .ab-team__extra {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  color: var(--gray-500);
  font-size: 14px;
}
.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-within {
  border-color: var(--line);
  background: rgba(255, 255, 255, .08);
  transform: translateY(-3px);
}

/* 版本时间轴 */
.page-about .ab-version__grid {
  display: grid;
  gap: 26px;
}
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 26px;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-400), rgba(255, 194, 77, .12));
}
.page-about .ab-timeline__item {
  position: relative;
  padding-left: 30px;
}
.page-about .ab-timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold-400);
}
.page-about .ab-timeline__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: .06em;
  color: var(--gold-400);
}
.page-about .ab-timeline__name {
  margin: 4px 0 8px;
  font-size: 18px;
  color: var(--white);
}
.page-about .ab-timeline__desc {
  margin: 0 !important;
  color: var(--mist) !important;
  font-size: 15px;
}
.page-about .ab-details {
  margin-top: 10px;
}
.page-about .ab-details summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan-300);
  padding: 4px 0;
  list-style: none;
}
.page-about .ab-details summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-details summary::before {
  content: "+ ";
  color: var(--cyan-500);
}
.page-about .ab-details[open] summary::before {
  content: "− ";
}
.page-about .ab-details summary:focus-visible {
  outline: 1px solid var(--cyan-300);
  outline-offset: 2px;
}
.page-about .ab-details__list {
  margin: 8px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-500);
}
.page-about .ab-version__media {
  margin: 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}
.page-about .ab-version__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 行动按钮 */
.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* 桌面布局 */
@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    align-items: end;
  }
  .page-about .ab-hero__media {
    align-self: stretch;
  }
  .page-about .ab-layout {
    grid-template-columns: minmax(0, 1fr) 268px;
    align-items: start;
  }
  .page-about .ab-side {
    order: 0;
    position: sticky;
    top: 96px;
  }
  .page-about .ab-toc__list {
    grid-template-columns: 1fr;
  }
  .page-about .ab-chapter {
    grid-template-columns: clamp(120px, 15vw, 178px) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 54px);
    align-items: start;
  }
  .page-about .ab-team {
    grid-template-columns: 1.08fr 1fr .92fr;
    gap: 18px;
    align-items: start;
  }
  .page-about .ab-version__grid {
    grid-template-columns: minmax(0, 1fr) 268px;
    gap: clamp(22px, 3vw, 40px);
    align-items: start;
  }
  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.6vw, 34px);
  }
  .page-about .ab-timeline::before {
    left: 0;
    right: 0;
    top: 6px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--gold-400), rgba(255, 194, 77, .12));
  }
  .page-about .ab-timeline__item {
    padding-left: 0;
    padding-top: 30px;
  }
  .page-about .ab-timeline__dot {
    top: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__card,
  .page-about .ab-leagues li,
  .page-about .ab-toc__list a {
    transition: none;
  }
  .page-about .ab-team__card:hover,
  .page-about .ab-team__card:focus-within {
    transform: none;
  }
}
</main>