.page-about {
  --ab-gutter: clamp(1rem, 4vw, 2.6rem);
  --ab-sec-gap: clamp(2.2rem, 5.5vw, 4rem);
  background-color: var(--ky-night);
  color: var(--ky-cloud);
  overflow-x: hidden;
  padding: 0;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about a {
  color: inherit;
}

/* ---------- 基础排版 ---------- */

.page-about .ab-wrap,
.page-about .ab-shell {
  width: 100%;
  max-width: var(--ky-max);
  margin-inline: auto;
  padding-inline: var(--ky-pad);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 .8rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: .75rem;
  line-height: 1;
  letter-spacing: .22em;
  color: var(--ky-signal);
}

.page-about .ab-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background-color: var(--ky-signal);
  flex: none;
}

.page-about .ab-h1 {
  margin: .35rem 0 0;
  font-family: var(--ky-serif);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--ky-cloud);
  max-width: 15em;
}

.page-about .ab-h2 {
  margin: 0;
  font-family: var(--ky-serif);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.26;
  letter-spacing: -.005em;
  color: var(--ky-cloud);
  max-width: 20em;
}

.page-about .ab-h3 {
  margin: 0 0 .45rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: clamp(1rem, 1.9vw, 1.2rem);
  line-height: 1.45;
  color: var(--ky-cloud);
}

.page-about .ab-lede {
  margin: 1.1rem 0 0;
  max-width: 40em;
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ky-haze);
}

.page-about .ab-prose p {
  margin: 0 0 1.05rem;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ky-haze);
}

.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}

.page-about .ab-num {
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: 1.15em;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--ky-cloud);
}

.page-about .ab-n {
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: 1.12em;
  letter-spacing: .01em;
  color: var(--ky-cloud);
}

.page-about .ab-inline {
  color: var(--ky-pulse);
  text-decoration: underline;
  text-decoration-color: rgba(255,146,87,.45);
  text-underline-offset: .22em;
  transition: color .2s var(--ky-ease), text-decoration-color .2s var(--ky-ease);
}

.page-about .ab-inline:hover,
.page-about .ab-inline:focus-visible {
  color: var(--ky-signal);
  text-decoration-color: var(--ky-signal);
}

/* ---------- 面包屑 ---------- */

.page-about .ab-crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--ky-metal);
}

.page-about .ab-crumb li + li::before {
  content: "/";
  margin-right: .35rem;
  opacity: .55;
}

.page-about .ab-crumb a {
  color: var(--ky-haze);
  text-decoration: none;
  transition: color .2s var(--ky-ease);
}

.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--ky-pulse);
}

.page-about .ab-crumb [aria-current="page"] {
  color: var(--ky-cloud);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.8rem, 5vw, 3.4rem) 0;
  background:
    radial-gradient(110% 68% at 76% -12%, rgba(195,213,234,.16), transparent 62%),
    linear-gradient(180deg, var(--ky-night-deep) 0%, var(--ky-night) 58%, var(--ky-gap) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ky-line-strong), transparent);
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.4rem;
  margin: 1.9rem 0 0;
  padding: 1.15rem 0 0;
  list-style: none;
  border-top: 1px solid var(--ky-line);
}

.page-about .ab-facts li {
  display: flex;
  align-items: baseline;
  gap: .45rem;
}

.page-about .ab-facts .ab-num {
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  color: var(--ky-signal);
}

.page-about .ab-fact__label {
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--ky-metal);
}

.page-about .ab-hero__fig {
  margin: clamp(1.8rem, 4.5vw, 3rem) auto 0;
  width: 100%;
  max-width: var(--ky-max);
  padding-inline: var(--ky-pad);
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: clamp(200px, 40vw, 430px);
  object-fit: cover;
  object-position: center;
  border: 1px solid var(--ky-line-strong);
  border-radius: 2px;
  box-shadow: var(--ky-shadow);
}

/* ---------- 左侧章节栏 ---------- */

.page-about .ab-shell {
  display: block;
  padding-top: clamp(1.4rem, 3vw, 2.2rem);
}

.page-about .ab-rail {
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
}

.page-about .ab-rail__list {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 0;
  padding: 0 0 1rem;
  list-style: none;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .ab-rail__link {
  display: block;
  padding: .4rem .7rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: .75rem;
  line-height: 1.4;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--ky-metal);
  text-decoration: none;
  border: 1px solid var(--ky-line);
  border-radius: 2px;
  transition: color .2s var(--ky-ease), border-color .2s var(--ky-ease), background-color .2s var(--ky-ease);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ky-cloud);
  border-color: var(--ky-line-strong);
}

.page-about .ab-rail__link.is-active,
.page-about .ab-rail__link[aria-current="true"] {
  color: var(--ky-night-deep);
  background-color: var(--ky-signal);
  border-color: var(--ky-signal);
}

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

/* ---------- 章节通用 ---------- */

.page-about .ab-sec {
  padding-block: var(--ab-sec-gap);
}

.page-about .ab-sec + .ab-sec {
  border-top: 1px solid var(--ky-line);
}

.page-about .ab-sec--deep {
  position: relative;
}

.page-about .ab-sec--deep::before {
  content: "";
  position: absolute;
  inset: 0 calc(50% - 50vw);
  z-index: -1;
  background: linear-gradient(180deg, rgba(7,18,35,.65) 0%, rgba(23,48,79,.5) 100%);
  pointer-events: none;
}

.page-about .ab-sec__head {
  margin-bottom: clamp(1.3rem, 3.2vw, 2rem);
}

.page-about .ab-sec__note {
  margin: .9rem 0 0;
  max-width: 38em;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ky-metal);
}

/* ---------- 赛季年份快捷条 ---------- */

.page-about .ab-years {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1.4rem;
}

.page-about .ab-year {
  padding: .32rem .72rem;
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: .875rem;
  letter-spacing: .07em;
  color: var(--ky-haze);
  text-decoration: none;
  border: 1px solid var(--ky-line-strong);
  border-radius: 2px;
  transition: color .2s var(--ky-ease), background-color .2s var(--ky-ease), border-color .2s var(--ky-ease);
}

.page-about .ab-year:hover,
.page-about .ab-year:focus-visible {
  color: var(--ky-night-deep);
  background-color: var(--ky-pulse);
  border-color: var(--ky-pulse);
}

/* ---------- 赛季时间线 ---------- */

.page-about .ab-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: .3rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--ky-line);
}

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

.page-about .ab-tl__year {
  display: block;
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--ky-signal);
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 40em;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ky-haze);
}

/* ---------- 图片 ---------- */

.page-about .ab-fig {
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--ky-line-strong);
  border-radius: 2px;
  box-shadow: var(--ky-shadow);
}

.page-about .ab-figcap {
  margin-top: .7rem;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--ky-metal);
}

/* ---------- 团队矩阵 ---------- */

.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
}

.page-about .ab-team__card {
  position: relative;
  padding: 1.3rem 1.3rem 1.45rem;
  background: linear-gradient(158deg, var(--ky-gap) 0%, var(--ky-night-deep) 100%);
  border: 1px solid var(--ky-line);
  border-left: 3px solid var(--ky-line-strong);
  border-radius: 2px;
  transition: transform .25s var(--ky-ease), border-color .25s var(--ky-ease);
}

.page-about .ab-team__card:hover,
.page-about .ab-team__card:focus-visible {
  transform: translateY(-3px);
  border-left-color: var(--ky-pulse);
  outline: none;
}

.page-about .ab-team__card:focus-visible {
  border-color: var(--ky-pulse);
}

.page-about .ab-team__head {
  display: flex;
  align-items: baseline;
  gap: .25rem;
  margin: 0;
}

.page-about .ab-num-lg {
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--ky-pulse);
}

.page-about .ab-team__unit {
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--ky-metal);
}

.page-about .ab-team__name {
  margin: .65rem 0 .45rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--ky-cloud);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--ky-haze);
}

/* ---------- 数据校验流程 ---------- */

.page-about .ab-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-flow__step {
  padding: 1.15rem 0;
  border-top: 1px solid var(--ky-line);
}

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

.page-about .ab-flow__idx {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: .9375rem;
  letter-spacing: .08em;
  color: var(--ky-live);
}

.page-about .ab-flow__title {
  margin: 0 0 .35rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--ky-cloud);
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: .875rem;
  line-height: 1.78;
  color: var(--ky-haze);
}

.page-about .ab-prose--after {
  margin-top: clamp(1.4rem, 3.5vw, 2.2rem);
}

/* ---------- 三级联赛 ---------- */

.page-about .ab-tiers {
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ky-line);
}

.page-about .ab-tier {
  display: grid;
  grid-template-columns: 1fr;
  gap: .4rem;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .ab-tier__name {
  margin: 0;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--ky-cloud);
}

.page-about .ab-tier__name span {
  display: block;
  margin-bottom: .3rem;
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--ky-signal);
}

.page-about .ab-tier__desc {
  margin: 0;
  max-width: 38em;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ky-haze);
}

/* ---------- 媒体合作 ---------- */

.page-about .ab-partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
}

.page-about .ab-partner__main p {
  margin: 0 0 1.05rem;
  max-width: 40em;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ky-haze);
}

.page-about .ab-partner__main p:last-child {
  margin-bottom: 0;
}

.page-about .ab-partner__side {
  padding: 1.25rem 1.25rem 1.4rem;
  background-color: var(--ky-paper);
  border-radius: 2px;
  box-shadow: var(--ky-shadow);
}

.page-about .ab-panel__label {
  margin: 0 0 .9rem;
  padding-bottom: .6rem;
  font-family: var(--ky-num);
  font-weight: 700;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--ky-signal);
  border-bottom: 1px solid var(--ky-paper-line);
}

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

.page-about .ab-panel__list > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: .15rem;
  padding-block: .6rem;
}

.page-about .ab-panel__list > div + div {
  border-top: 1px solid var(--ky-paper-line);
}

.page-about .ab-panel__list dt {
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--ky-metal);
}

.page-about .ab-panel__list dd {
  margin: 0;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: .9375rem;
  line-height: 1.55;
  color: var(--ky-ink);
}

/* ---------- 行动区 ---------- */

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
}

.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .78rem 1.4rem;
  font-family: var(--ky-sans);
  font-weight: 500;
  font-size: .9375rem;
  line-height: 1;
  letter-spacing: .04em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color .22s var(--ky-ease), color .22s var(--ky-ease),
              border-color .22s var(--ky-ease), transform .22s var(--ky-ease);
}

.page-about .ab-btn--signal {
  background-color: var(--ky-signal);
  color: #FFFFFF;
}

.page-about .ab-btn--signal:hover,
.page-about .ab-btn--signal:focus-visible {
  background-color: var(--ky-pulse);
  transform: translateY(-2px);
}

.page-about .ab-btn--ghost {
  color: var(--ky-cloud);
  border-color: var(--ky-line-strong);
}

.page-about .ab-btn--ghost:hover,
.page-about .ab-btn--ghost:focus-visible {
  background-color: rgba(195,213,234,.09);
  border-color: var(--ky-haze);
  transform: translateY(-2px);
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about .ab-tl {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 1.5rem;
    align-items: start;
  }

  .page-about .ab-fig--half {
    max-width: 78%;
  }

  .page-about .ab-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .9rem;
  }

  .page-about .ab-flow__step {
    padding: 1.25rem 1.15rem;
    border: 1px solid var(--ky-line);
    border-radius: 2px;
    background-color: rgba(23,48,79,.45);
  }

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .ab-shell {
    display: grid;
    grid-template-columns: 172px minmax(0, 1fr);
    column-gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
    padding-top: clamp(1.8rem, 4vw, 3rem);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 1.5rem;
    margin-bottom: 0;
    padding-bottom: 2rem;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 0;
    border-bottom: 0;
  }

  .page-about .ab-rail__link {
    padding: .58rem 0 .58rem 1rem;
    font-size: .8125rem;
    letter-spacing: .05em;
    border: 0;
    border-left: 2px solid var(--ky-line);
    border-radius: 0;
    background: none;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    color: var(--ky-cloud);
    border-left-color: var(--ky-line-strong);
  }

  .page-about .ab-rail__link.is-active,
  .page-about .ab-rail__link[aria-current="true"] {
    color: var(--ky-signal);
    background-color: transparent;
    border-left-color: var(--ky-signal);
  }

  .page-about .ab-tl {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 0 2rem;
    padding-block: 1.4rem;
  }

  .page-about .ab-tier {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 0 2rem;
    align-items: baseline;
  }

  .page-about .ab-tier__name span {
    margin-bottom: .5rem;
  }

  .page-about .ab-partner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-fig--half {
    max-width: 62%;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

  .page-about .ab-team__card:hover,
  .page-about .ab-team__card:focus-visible,
  .page-about .ab-btn:hover,
  .page-about .ab-btn:focus-visible {
    transform: none;
  }
}