.page-about {
  --ab-gap: 18px;
  --ab-radius: var(--r-lg);
  background: var(--bg-0);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: 52px 0 44px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}
.page-about .ab-hero__bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.4;
}
.page-about .ab-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(43, 232, 208, 0.16), transparent 62%),
    radial-gradient(90% 80% at 92% 14%, rgba(122, 92, 255, 0.16), transparent 60%),
    linear-gradient(180deg, rgba(10, 23, 48, 0.62) 0%, rgba(10, 23, 48, 0.94) 76%, var(--bg-0) 100%);
}
.page-about .ab-hero__inner {
  position: relative;
}
.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 32px;
  line-height: 1.2;
  margin: 14px 0 0;
  max-width: 20em;
}
.page-about .ab-hero__lede {
  margin-top: 16px;
  max-width: 40em;
}
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-stats .kpi {
  padding: 12px 14px 14px;
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(17, 41, 75, 0.9), rgba(10, 23, 48, 0.5));
  border: 1px solid var(--line-soft);
}
.page-about .ab-stats .kpi__num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
  font-weight: 700;
}
.page-about .ab-stats .kpi__unit {
  margin-left: 4px;
  font-size: 12px;
  color: var(--ink-dim);
}
.page-about .ab-stats .kpi__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-dim);
}

/* ---------- 面包屑与骨架 ---------- */
.page-about .ab-crumbs {
  padding: 16px 0 0;
  font-size: 13px;
}
.page-about .ab-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  color: var(--ink-dim);
}
.page-about .ab-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .ab-crumbs a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .ab-layout {
  padding-top: 24px;
  padding-bottom: 64px;
}
.page-about .ab-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  padding: 34px 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 8px;
}
.page-about .ab-sec h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 23px;
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--ink);
}
.page-about .ab-sec h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0;
  color: var(--ink);
}
.page-about .ab-sec p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-dim);
  margin: 10px 0 0;
}
.page-about .ab-sec .section-head .lede {
  max-width: 40em;
}

/* ---------- 场景 ---------- */
.page-about .ab-scenes {
  display: grid;
  gap: var(--ab-gap);
  margin-top: 24px;
}
.page-about .ab-scene {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--ab-radius);
  background: linear-gradient(165deg, var(--bg-1), rgba(12, 29, 58, 0.7));
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--cyan-deep);
}
.page-about .ab-scene__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .ab-scene h3 {
  margin-top: 10px;
}

/* ---------- 数据来源流程 ---------- */
.page-about .ab-flow {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}
.page-about .ab-flow__step {
  position: relative;
  padding: 16px 18px 18px;
  border-radius: var(--r-md);
  background: rgba(17, 41, 75, 0.62);
  border: 1px solid var(--line-soft);
}
.page-about .ab-flow__dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--r-pill);
  background: var(--cyan-a16);
  color: var(--cyan);
  font-size: 13px;
  border: 1px solid var(--cyan-deep);
}
.page-about .ab-flow__dot--signal {
  background: var(--orange-a14);
  color: var(--orange);
  border-color: var(--orange);
}
.page-about .ab-flow__step h3 {
  margin-top: 10px;
  font-size: 15px;
}
.page-about .ab-src-notes {
  margin-top: 22px;
}
.page-about .ab-src-notes .badge {
  margin: 0 2px;
}

/* ---------- 赛事覆盖 ---------- */
.page-about .ab-cov {
  margin-top: 26px;
  padding: 20px 18px;
  border-radius: var(--ab-radius);
  background: linear-gradient(120deg, rgba(17, 41, 75, 0.9), rgba(10, 23, 48, 0.5));
  border: 1px solid var(--line-soft);
}
.page-about .ab-cov__row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 56px;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
}
.page-about .ab-cov__row + .ab-cov__row {
  border-top: 1px dashed var(--line-soft);
}
.page-about .ab-cov__name {
  font-size: 13.5px;
  color: var(--ink);
}
.page-about .ab-cov__track {
  display: block;
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(31, 58, 99, 0.5);
  overflow: hidden;
}
.page-about .ab-cov__bar {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
}
.page-about .ab-cov__bar--1 {
  width: 100%;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
}
.page-about .ab-cov__bar--2 {
  width: 75%;
  background: linear-gradient(90deg, var(--purple), rgba(122, 92, 255, 0.6));
}
.page-about .ab-cov__bar--3 {
  width: 62.5%;
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
}
.page-about .ab-cov__num {
  text-align: right;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}
.page-about .ab-cov__num em {
  font-style: normal;
  font-size: 11px;
  color: var(--ink-dim);
  margin-left: 2px;
}
.page-about .ab-cov__notes {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-cov__notes li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-dim);
}
.page-about .ab-cov__notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan-deep);
}
.page-about .ab-cov__notes strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 配图 ---------- */
.page-about .ab-media {
  margin: 24px 0 0;
  border-radius: var(--ab-radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(20, 47, 82, 0.7), rgba(10, 23, 48, 0.9));
}
.page-about .ab-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .ab-media figcaption {
  padding: 11px 16px 13px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-dim);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-roles {
  margin-top: 24px;
  padding: 20px 18px 22px;
  border-radius: var(--ab-radius);
  background: rgba(12, 29, 58, 0.72);
  border: 1px solid var(--line-soft);
}
.page-about .ab-roles__title {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}
.page-about .ab-roles__bars {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}
.page-about .ab-roles__seg {
  flex: 1 1 140px;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--ink);
  border: 1px solid var(--line-soft);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.page-about .ab-roles__seg b {
  font-size: 18px;
  font-weight: 700;
}
.page-about .ab-roles__seg--a {
  background: var(--cyan-a16);
  border-color: var(--cyan-deep);
}
.page-about .ab-roles__seg--a b {
  color: var(--cyan);
}
.page-about .ab-roles__seg--b {
  background: var(--purple-a14);
  border-color: rgba(122, 92, 255, 0.5);
}
.page-about .ab-roles__seg--b b {
  color: var(--purple);
}
.page-about .ab-roles__seg--c {
  background: rgba(22, 167, 154, 0.12);
  border-color: rgba(22, 167, 154, 0.55);
}
.page-about .ab-roles__seg--c b {
  color: var(--cyan-deep);
}
.page-about .ab-roles__seg--d {
  background: var(--orange-a14);
  border-color: rgba(255, 122, 47, 0.5);
}
.page-about .ab-roles__seg--d b {
  color: var(--orange-soft);
}
.page-about .ab-roles__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 16px 0 0;
  border-top: 1px dashed var(--line-soft);
  display: grid;
  gap: 10px;
}
.page-about .ab-roles__legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-dim);
}
.page-about .ab-dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 3px;
  display: block;
}
.page-about .ab-dot--a { background: var(--cyan); }
.page-about .ab-dot--b { background: var(--purple); }
.page-about .ab-dot--c { background: var(--cyan-deep); }
.page-about .ab-dot--d { background: var(--orange); }

/* ---------- 比赛日时间线 ---------- */
.page-about .ab-day {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  position: relative;
}
.page-about .ab-day::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan-deep), rgba(31, 58, 99, 0.4));
}
.page-about .ab-day__item {
  position: relative;
  padding: 0 0 18px 26px;
}
.page-about .ab-day__item:last-child {
  padding-bottom: 0;
}
.page-about .ab-day__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: var(--r-pill);
  background: var(--bg-0);
  border: 2px solid var(--cyan-deep);
}
.page-about .ab-day__item--now::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-a16);
}
.page-about .ab-day__time {
  display: block;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}
.page-about .ab-day__item--now .ab-day__time {
  color: var(--orange);
}
.page-about .ab-day__item p {
  margin-top: 4px;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-hist {
  margin-top: 24px;
  display: grid;
  gap: 12px;
}
.page-about .ab-hist__item {
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(12, 29, 58, 0.68);
  border-left: 3px solid var(--cyan-deep);
  overflow: hidden;
}
.page-about .ab-hist__item--now {
  border-left-color: var(--orange);
}
.page-about .ab-hist__item summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) 18px;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
}
.page-about .ab-hist__item summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-hist__year {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}
.page-about .ab-hist__item--now .ab-hist__year {
  color: var(--orange);
}
.page-about .ab-hist__name {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink);
}
.page-about .ab-hist__toggle {
  position: relative;
  width: 14px;
  height: 14px;
}
.page-about .ab-hist__toggle::before,
.page-about .ab-hist__toggle::after {
  content: "";
  position: absolute;
  background: var(--ink-dim);
  transition: transform 220ms var(--ease);
}
.page-about .ab-hist__toggle::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}
.page-about .ab-hist__toggle::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}
.page-about .ab-hist__item[open] .ab-hist__toggle::after {
  transform: scaleY(0);
}
.page-about .ab-hist__body {
  padding: 0 16px 16px;
  border-top: 1px dashed var(--line-soft);
}
.page-about .ab-hist__body p {
  margin-top: 12px;
  font-size: 14px;
}

/* ---------- 服务支持 ---------- */
.page-about .ab-support .ab-support__grid {
  margin-top: 24px;
}
.page-about .ab-support__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.page-about .ab-support__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-dim);
}
.page-about .ab-support__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: var(--r-pill);
  background: var(--cyan);
}
.page-about .ab-support__contact p {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-top: 0;
}
.page-about .ab-support__contact p + p {
  margin-top: 12px;
}
.page-about .ab-support__label {
  min-width: 68px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}
.page-about .ab-support__contact a {
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}
.page-about .ab-support__actions {
  margin-top: 24px;
  align-items: center;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero h1 {
    font-size: 42px;
  }
  .page-about .ab-sec h2 {
    font-size: 28px;
  }
  .page-about .ab-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .ab-scene:nth-child(2) {
    transform: translateY(18px);
  }
  .page-about .ab-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 22px;
  }
  .page-about .ab-flow__step + .ab-flow__step::after {
    content: "";
    position: absolute;
    left: -22px;
    top: 28px;
    width: 22px;
    height: 1px;
    background: linear-gradient(90deg, var(--cyan-deep), var(--line));
  }
  .page-about .ab-roles__seg {
    flex: 1 1 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding: 88px 0 72px;
  }
  .page-about .ab-hero h1 {
    font-size: 56px;
    max-width: 15em;
  }
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--ab-gap);
  }
  .page-about .ab-stats .kpi__num {
    font-size: 36px;
  }
  .page-about .ab-sec {
    padding: 52px 0;
  }
  .page-about .ab-sec h2 {
    font-size: 32px;
  }
  .page-about .ab-scene {
    padding: 26px 24px 28px;
  }
  .page-about .ab-cov__row {
    grid-template-columns: 96px minmax(0, 1fr) 72px;
    gap: 18px;
    padding: 12px 0;
  }
  .page-about .ab-media img {
    aspect-ratio: 16 / 9;
  }
  .page-about .ab-roles__legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 26px;
  }
  .page-about .ab-day__item {
    padding-left: 32px;
  }
  .page-about .ab-support__actions {
    gap: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hist__toggle::before,
  .page-about .ab-hist__toggle::after {
    transition: none;
  }
  .page-about .ab-scene:nth-child(2) {
    transform: none;
  }
}