.page-about {
  background: var(--cream);
  color: var(--ink-86);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
}

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

.page-about a {
  color: var(--teal);
}

/* ---------- 首屏 ---------- */
.page-about .about-head {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(130% 110% at 86% -12%, rgba(23, 215, 208, .22), transparent 58%),
    radial-gradient(90% 90% at 6% 112%, rgba(255, 107, 74, .16), transparent 62%),
    linear-gradient(158deg, var(--ink) 0%, var(--sea) 64%, #072a42 100%);
  color: var(--cream);
  padding: clamp(22px, 4vw, 38px) 0 clamp(32px, 5vw, 60px);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(214, 242, 238, .07) 0 1px, transparent 1px 68px),
    repeating-linear-gradient(0deg, rgba(214, 242, 238, .05) 0 1px, transparent 1px 68px);
}

.page-about .about-head__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-head .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .08em;
}

.page-about .about-head .breadcrumb__item a {
  color: var(--on-dark-dim);
  text-decoration: none;
}

.page-about .about-head .breadcrumb__item a:hover {
  color: var(--cyan);
}

.page-about .about-head .breadcrumb__sep {
  color: var(--on-dark-dim);
}

.page-about .about-head .breadcrumb__current {
  color: var(--cyan);
}

.page-about .about-head__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--coral);
}

.page-about .about-head__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: -.01em;
  color: #fff;
}

.page-about .about-head__lead {
  margin: 0 0 28px;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(214, 242, 238, .18);
  border: 1px solid rgba(214, 242, 238, .18);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: rgba(6, 28, 46, .74);
  padding: 14px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__num small {
  font-size: .48em;
  margin-left: 3px;
  color: var(--on-dark-dim);
  font-weight: 500;
}

.page-about .about-stat__key {
  display: block;
  margin-top: 6px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--on-dark-dim);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  padding-top: clamp(34px, 5vw, 60px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--ink-55);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-70);
  font-family: var(--font-index);
  font-size: var(--fs-12);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  color: var(--coral);
}

.page-about .about-rail__link:hover {
  color: var(--teal);
  border-color: var(--teal);
}

/* ---------- 章节流 ---------- */
.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(34px, 5vw, 62px);
}

.page-about .about-sec {
  border-top: 1px solid var(--line);
  padding-top: clamp(26px, 4vw, 42px);
}

.page-about .about-sec:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-sec__head {
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-sec__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
}

.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: .06em;
  color: var(--coral);
}

.page-about .about-sec__label {
  padding: 2px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--paper);
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .12em;
  color: var(--sea);
}

.page-about .about-sec__title {
  margin: 0 0 12px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  color: var(--ink);
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 36em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 图片容器 ---------- */
.page-about .media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

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

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--ink-55);
}

.page-about .about-figure {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

/* ---------- 赛季时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--sea) 52%, var(--teal));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--sea);
}

.page-about .about-timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--coral);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-split__media {
  margin: 0;
}

.page-about .prose p {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-70);
}

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

.page-about .prose a {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---------- 数字格 ---------- */
.page-about .about-figures {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figure {
  background: var(--cream);
  padding: 16px 14px;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.1;
  color: var(--sea);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__num small {
  font-size: .48em;
  margin-left: 2px;
  color: var(--ink-55);
  font-weight: 500;
}

.page-about .about-figure__key {
  display: block;
  margin-top: 6px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  color: var(--ink-55);
}

/* ---------- 档案切换 ---------- */
.page-about .about-arch {
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-arch__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-arch__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-arch__tab {
  padding: 7px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-70);
  font-family: var(--font-index);
  font-size: var(--fs-14);
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-arch__panel {
  display: none;
  padding: clamp(16px, 2.6vw, 24px);
  border: 1px solid rgba(10, 107, 105, .2);
  border-radius: var(--radius);
  background: var(--mist);
}

.page-about .about-arch__panel > p {
  margin: 0;
  max-width: 40em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-86);
}

.page-about .about-arch__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-arch__list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-arch__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 2px;
  background: var(--teal);
}

.page-about #about-arch-team:checked ~ .about-arch__panels > .about-arch__panel--team,
.page-about #about-arch-season:checked ~ .about-arch__panels > .about-arch__panel--season,
.page-about #about-arch-venue:checked ~ .about-arch__panels > .about-arch__panel--venue {
  display: block;
}

.page-about #about-arch-team:checked ~ .about-arch__bar .about-arch__tab--team,
.page-about #about-arch-season:checked ~ .about-arch__bar .about-arch__tab--season,
.page-about #about-arch-venue:checked ~ .about-arch__bar .about-arch__tab--venue {
  background: var(--sea);
  border-color: var(--sea);
  color: var(--cream);
}

.page-about .about-arch__radio:focus-visible ~ .about-arch__bar {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 赛事覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-cover {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--sea);
  border-radius: var(--radius);
  background: var(--cream);
}

.page-about .about-cover--cup {
  border-top-color: var(--cyan);
  background: var(--paper);
}

.page-about .about-cover--continental {
  border-top-color: var(--coral);
}

.page-about .about-cover__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-20);
  color: var(--ink);
}

.page-about .about-cover__body {
  margin: 0 0 14px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-cover__tags {
  margin: 0;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--teal);
}

/* ---------- 版本号 ---------- */
.page-about .about-version {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-version__code {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  padding: 10px 18px;
  border: 1px solid var(--line-strong);
  border-bottom: 3px solid var(--coral);
  border-radius: var(--radius);
  background: var(--cream);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-version__dot {
  color: var(--coral);
}

.page-about .about-version__copy {
  padding: 9px 18px;
  border: 1px solid var(--teal);
  border-radius: var(--radius);
  background: transparent;
  color: var(--teal);
  font-family: var(--font-index);
  font-size: var(--fs-14);
  letter-spacing: .04em;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-version__copy:hover {
  background: var(--teal);
  color: var(--cream);
}

.page-about .about-version__copy.is-copied {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-version__list {
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  border-top: 1px solid var(--line);
}

.page-about .about-version__row {
  position: relative;
  padding: 15px 0 15px 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-version__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: var(--cyan);
}

.page-about .about-version__row dt {
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--sea);
}

.page-about .about-version__row dd {
  margin: 6px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--ink-70);
}

.page-about .about-version__note {
  margin: 20px 0 0;
  max-width: 40em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 字段说明 ---------- */
.page-about .about-specs {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-spec {
  border-bottom: 1px solid var(--line);
}

.page-about .about-spec__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 2px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-20);
  color: var(--ink);
}

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

.page-about .about-spec__toggle {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-about .about-spec__toggle::before,
.page-about .about-spec__toggle::after {
  content: "";
  position: absolute;
  background: var(--sea);
  border-radius: 1px;
}

.page-about .about-spec__toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .about-spec__toggle::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
  transition: transform .18s var(--ease);
}

.page-about .about-spec[open] .about-spec__toggle::after {
  transform: scaleY(0);
}

.page-about .about-spec__body {
  margin: 0 0 18px;
  max-width: 52em;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--ink-70);
}

/* ---------- 回到赛程 ---------- */
.page-about .about-recall {
  padding: 22px 20px;
  border-left: 4px solid var(--cyan);
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink) 0%, var(--sea) 100%);
  color: var(--cream);
}

.page-about .about-recall__label {
  margin: 0 0 10px;
  font-family: var(--font-index);
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-recall__text {
  margin: 0 0 18px;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .about-recall__btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--radius);
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-index);
  font-size: var(--fs-14);
  font-weight: 500;
  letter-spacing: .06em;
  text-decoration: none;
}

.page-about .about-recall__btn:hover {
  background: var(--coral);
  color: var(--cream);
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-enter) var(--ease), transform var(--dur-enter) var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figures {
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    padding-bottom: 22px;
  }

  .page-about .about-coverage {
    grid-template-columns: 5fr 4fr 3fr;
    align-items: start;
  }

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

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 168px minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding-bottom: 0;
    overflow: visible;
    border-left: 1px solid var(--line-strong);
  }

  .page-about .about-rail__link {
    display: flex;
    padding: 9px 10px 9px 18px;
    border: none;
    border-radius: 0;
    background: transparent;
    white-space: normal;
    position: relative;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 50%;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--grid);
    transform: translateY(-50%);
    transition: background .18s var(--ease), transform .18s var(--ease);
  }

  .page-about .about-rail__link:hover::before {
    background: var(--coral);
    transform: translateY(-50%) scale(1.35);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-arch__tab,
  .page-about .about-version__copy,
  .page-about .about-rail__link::before,
  .page-about .about-spec__toggle::after {
    transition: none;
  }
}