.page-about {
  --tl-line: 3px;
  --about-cell-pad: clamp(14px, 2.4vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  display: grid;
  gap: 16px;
  padding-block: clamp(22px, 4vw, 48px) clamp(30px, 5vw, 62px);
  border-bottom: var(--edge) solid var(--line);
}

.page-about .about-intro__title {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(2rem, 6vw, 4.6rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ice);
  max-width: 18ch;
  text-wrap: balance;
}

.page-about .about-intro__lede {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: var(--measure);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(8px, 2vw, 18px) 0 0;
  background: var(--line);
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-step);
  overflow: hidden;
}

.page-about .about-facts__cell {
  background: var(--panel);
  padding: var(--about-cell-pad);
  display: grid;
  gap: 6px;
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--ink-mute);
  order: 0;
}

.page-about .about-facts__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-facts__unit {
  font-size: 0.55em;
  color: var(--silver);
  margin-left: 2px;
}

/* ---------- 通用小标题 ---------- */
.page-about .about-h2 {
  margin: 6px 0 0;
  font-size: var(--fs-h2);
  line-height: 1.2;
  font-weight: 800;
  color: var(--ice);
  max-width: 22ch;
  text-wrap: balance;
}

/* ---------- 定位 ---------- */
.page-about .about-origin__body {
  display: grid;
  gap: 14px;
  margin-top: 20px;
  max-width: var(--measure);
}

.page-about .about-origin__body p {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-origin__note {
  margin: 22px 0 0;
  padding: 14px 16px;
  border-left: var(--tl-line) solid var(--flare);
  background: rgba(255, 107, 69, 0.07);
  color: var(--silver);
  font-size: var(--fs-small);
  line-height: 1.75;
  max-width: 62ch;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__intro {
  margin: 14px 0 26px;
  color: var(--ink-soft);
  font-size: var(--fs-small);
  line-height: 1.75;
  max-width: 54ch;
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 8px;
  width: var(--tl-line);
  background: linear-gradient(180deg, var(--neon) 0%, var(--struct) 26%, var(--struct) 78%, var(--flare) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 14px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 15px;
  width: 17px;
  height: 17px;
  background: var(--deep);
  border: var(--tl-line) solid var(--neon);
  transform: rotate(45deg);
}

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

.page-about .stage {
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.page-about .stage[open] {
  border-color: var(--neon);
  background: var(--panel);
  box-shadow: var(--shadow-step);
}

.page-about .stage__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .stage__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--silver);
  transition: color var(--dur) var(--ease);
}

.page-about .stage[open] .stage__head::after {
  content: "−";
  color: var(--flare);
}

.page-about .stage__head:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 2px;
}

.page-about .stage__year {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 2.6vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--neon);
  line-height: 1.1;
}

.page-about .stage__title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ice);
  line-height: 1.4;
}

.page-about .stage__body {
  margin: 0 15px;
  padding: 12px 0 15px;
  border-top: 1px dashed var(--struct);
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-timeline__figure {
  margin-top: clamp(22px, 4vw, 40px);
}

/* ---------- 团队 ---------- */
.page-about .about-team__intro {
  margin: 14px 0 26px;
  color: var(--ink-soft);
  font-size: var(--fs-small);
  line-height: 1.75;
  max-width: 56ch;
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 4vw, 42px);
}

.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .crew::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--volt), var(--struct));
}

.page-about .crew__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .crew__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--panel);
  border: 2px solid var(--volt);
  border-radius: 2px;
}

.page-about .crew__title {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--ice);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--abyss);
  background: var(--neon);
  padding: 1px 7px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}

.page-about .crew__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 42ch;
}

.page-about .about-team__figure {
  align-self: start;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__intro {
  margin: 14px 0 22px;
  color: var(--ink-soft);
  font-size: var(--fs-small);
  line-height: 1.75;
}

.page-about .cov {
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  background: var(--deep);
  padding: clamp(14px, 2.6vw, 22px);
  box-shadow: var(--shadow-hard);
}

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

.page-about .cov__radio:focus-visible ~ .cov__tabs {
  outline: 2px solid var(--volt);
  outline-offset: 4px;
}

.page-about .cov__tab {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.06em;
  padding: 9px 14px;
  border: var(--edge) solid var(--struct);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--silver);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .cov__tab:hover {
  color: var(--ice);
  border-color: var(--volt);
}

.page-about #cov-foot:checked ~ .cov__tabs [for="cov-foot"],
.page-about #cov-basket:checked ~ .cov__tabs [for="cov-basket"],
.page-about #cov-racket:checked ~ .cov__tabs [for="cov-racket"],
.page-about #cov-esport:checked ~ .cov__tabs [for="cov-esport"] {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--abyss);
  font-weight: 700;
}

.page-about .cov__panels {
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: clamp(14px, 2.4vw, 20px);
}

.page-about .cov__panel {
  display: none;
}

.page-about #cov-foot:checked ~ .cov__panels #panel-foot,
.page-about #cov-basket:checked ~ .cov__panels #panel-basket,
.page-about #cov-racket:checked ~ .cov__panels #panel-racket,
.page-about #cov-esport:checked ~ .cov__panels #panel-esport {
  display: block;
}

.page-about .cov__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .cov__list li {
  border-left: 2px solid var(--struct);
  padding-left: 13px;
}

.page-about .cov__k {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--flare);
  margin-bottom: 4px;
}

.page-about .cov__v {
  display: block;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-coverage__figure {
  margin-top: clamp(22px, 4vw, 38px);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(20px, 3.6vw, 38px);
  margin-top: 22px;
}

.page-about .about-partners__text p {
  margin: 0 0 14px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--measure);
}

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

.page-about .about-partners__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: start;
}

.page-about .about-partners__stats li {
  background: var(--panel);
  padding: 16px var(--about-cell-pad);
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-partners__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--ice);
  line-height: 1;
  min-width: 3.4ch;
}

.page-about .about-partners__label {
  font-size: var(--fs-small);
  color: var(--silver);
  line-height: 1.5;
}

/* ---------- 结尾窄栏 ---------- */
.page-about .about-cta {
  margin-top: clamp(36px, 6vw, 72px);
  padding: clamp(22px, 4vw, 36px);
  border: var(--edge) solid var(--struct);
  border-left: 6px solid var(--neon);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(54, 242, 195, 0.08), transparent 62%);
  max-width: 62ch;
}

.page-about .about-cta__title {
  margin: 8px 0 0;
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--ice);
  line-height: 1.3;
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-cta__note {
  margin: 18px 0 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--ink-mute);
}

.page-about .about-cta__note a {
  color: var(--volt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__note a:hover {
  color: var(--neon);
}

/* ---------- 图片基座修正 ---------- */
.page-about .about-team__figure img,
.page-about .about-timeline__figure img,
.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 中等宽度 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-origin__body {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 32px;
    max-width: none;
  }

  .page-about .about-coverage .cov__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }
}

/* ---------- 桌面：时间轴交错 ---------- */
@media (min-width: 900px) {
  .page-about .about-intro__lede {
    margin-left: 14%;
  }

  .page-about .timeline::before {
    left: 50%;
    margin-left: calc(var(--tl-line) / -2);
  }

  .page-about .timeline__item {
    width: calc(50% - 36px);
    padding-left: 0;
    margin-bottom: 20px;
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: auto;
    text-align: right;
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .timeline__item::before {
    left: -46px;
    top: 16px;
  }

  .page-about .timeline__item:nth-child(odd)::before {
    left: auto;
    right: -46px;
  }

  .page-about .timeline__item:nth-child(odd) .stage__head {
    flex-direction: row-reverse;
  }

  .page-about .timeline__item:nth-child(odd) .stage__head::after {
    margin-left: 0;
    margin-right: auto;
  }

  .page-about .timeline__item:nth-child(odd) .stage__body {
    text-align: right;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

/* ---------- 大屏留白 ---------- */
@media (min-width: 1200px) {
  .page-about .about-intro {
    padding-block: clamp(36px, 4vw, 64px) clamp(44px, 5vw, 76px);
  }

  .page-about .section {
    padding-block: clamp(44px, 5vw, 78px);
  }

  .page-about .timeline__item:nth-child(odd) {
    margin-right: auto;
    transform: translateY(-6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stage,
  .page-about .cov__tab,
  .page-about .timeline__item {
    transition: none;
    transform: none;
  }
}