.page-about {
  --about-radius: 18px;
  --about-gap: clamp(18px, 3.2vw, 34px);
  --about-ink-soft: rgba(238, 244, 250, .74);
  --about-ink-mute: rgba(238, 244, 250, .56);
  --about-body: #4A5364;
  --about-dark-body: #2B3444;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 6vw, 78px) 0 clamp(30px, 4.6vw, 58px);
  background:
    radial-gradient(112% 76% at 88% 0%, rgba(232, 163, 61, .20), transparent 58%),
    radial-gradient(88% 68% at 2% 98%, rgba(28, 143, 196, .22), transparent 62%),
    linear-gradient(180deg, #0F1929 0%, var(--ink-900) 100%);
}
.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(238, 244, 250, .18) 1px, transparent 1.4px);
  background-size: 44px 44px;
  opacity: .26;
  pointer-events: none;
}
.page-about .about-cover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 60px;
  background: linear-gradient(180deg, transparent, var(--ink-900));
  pointer-events: none;
}
.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
}
.page-about .about-cover__kicker {
  margin: 0;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
}
.page-about .about-cover__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 84px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--star);
}
.page-about .about-cover__hl {
  background: linear-gradient(96deg, var(--gold), var(--gold-soft) 60%, var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .about-cover__text {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-cover__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cover__gloss {
  margin: 0 0 18px;
  padding-left: 13px;
  border-left: 2px solid var(--lake);
  font-size: 12.5px;
  line-height: 1.95;
  letter-spacing: .03em;
  color: var(--about-ink-soft);
}
.page-about .about-cover__gloss-k {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--lake);
}
.page-about .about-cover__figs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-fig {
  padding: 14px 14px 16px;
  background: rgba(11, 17, 27, .74);
}
.page-about .about-fig__k {
  margin: 0 0 7px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--about-ink-mute);
}
.page-about .about-fig__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 4.6vw, 30px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  position: sticky;
  top: 0;
  z-index: 8;
  background: rgba(11, 17, 27, .94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-index__row {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-top: 9px;
  padding-bottom: 9px;
  scrollbar-width: none;
}
.page-about .about-index__row::-webkit-scrollbar {
  display: none;
}
.page-about .about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 13.5px;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(238, 244, 250, .66);
  transition: color .18s ease, border-color .18s ease, background .18s ease;
}
.page-about .about-index__link:hover {
  color: var(--star);
  border-color: var(--line);
  background: rgba(238, 244, 250, .05);
}
.page-about .about-index__link[aria-current="true"],
.page-about .about-index__link[aria-current="page"] {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
}
.page-about .about-index__link .chapter-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(48px, 7vw, 88px) 0;
}
.page-about .about-head {
  max-width: 880px;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}
.page-about .about-head__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--gold);
}
.page-about .about-head__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 5.2vw, 46px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--star);
}
.page-about .about-head__lede {
  max-width: 64ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* 亮色纸张分区 */
.page-about .about-paper {
  position: relative;
  background: linear-gradient(180deg, var(--paper), var(--paper-deep));
}
.page-about .about-paper::after {
  content: "";
  position: absolute;
  left: -4%;
  top: 0;
  width: 108%;
  height: 5px;
  background: linear-gradient(90deg, var(--gold), var(--lake) 70%, transparent);
  transform: rotate(-1.1deg);
  transform-origin: left center;
}
.page-about .about-head--dark .about-head__title {
  color: var(--about-dark-body);
}
.page-about .about-head--dark .about-head__lede {
  color: var(--about-body);
}
.page-about .about-head--dark .about-head__num {
  color: var(--lake-deep);
}

/* 深色分区 */
.page-about .about-deep {
  background:
    radial-gradient(90% 60% at 12% 0%, rgba(28, 143, 196, .14), transparent 62%),
    linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

/* ---------- 三支柱 ---------- */
.page-about .about-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}
.page-about .about-pillar {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(165deg, rgba(28, 143, 196, .12), rgba(24, 34, 52, .78) 44%, rgba(14, 21, 34, .94));
  transition: transform .22s ease, border-color .22s ease;
}
.page-about .about-pillar::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 163, 61, .24), transparent 70%);
  pointer-events: none;
}
.page-about .about-pillar:hover {
  transform: translateY(-3px);
  border-color: var(--line-gold);
}
.page-about .about-pillar__no {
  display: inline-block;
  margin-bottom: 14px;
  padding: 3px 9px;
  border: 1px solid var(--line-gold);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold);
}
.page-about .about-pillar__title {
  margin: 0 0 12px;
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 800;
  color: var(--star);
}
.page-about .about-pillar__text {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-pillar__list {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}
.page-about .about-pillar__list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 7px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--about-ink-mute);
}
.page-about .about-pillar__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 7px;
  height: 2px;
  background: var(--lake);
}
.page-about .about-pillar__link {
  display: inline-block;
  font-size: 13.5px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease;
}
.page-about .about-pillar__link:hover {
  border-bottom-color: var(--gold);
}

/* ---------- 规模数据 ---------- */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: clamp(22px, 3.4vw, 34px);
  background: rgba(43, 52, 68, .16);
  border: 1px solid rgba(43, 52, 68, .16);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-metric {
  padding: 18px 16px 20px;
  background: rgba(255, 255, 255, .62);
}
.page-about .about-metric__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--lake-deep);
}
.page-about .about-metric__u {
  font-size: .5em;
  letter-spacing: .06em;
  color: #4E5B6D;
}
.page-about .about-metric__k {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: #5A6273;
}

.page-about .about-sport {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid rgba(43, 52, 68, .2);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, .58);
  border-top-width: 4px;
}
.page-about .about-sport--ball {
  border-top-color: var(--gold);
}
.page-about .about-sport--court {
  border-top-color: var(--lake);
}
.page-about .about-sport--net {
  border-top-color: var(--poplar);
}
.page-about .about-sport__title {
  margin: 0 0 11px;
  font-size: 20px;
  font-weight: 800;
  color: var(--about-dark-body);
}
.page-about .about-sport__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-body);
}
.page-about .about-sport__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: #6C7385;
}

.page-about .about-evidences {
  margin-top: clamp(22px, 3.4vw, 34px);
}
.page-about .about-evi {
  position: relative;
  padding: 26px 22px 22px;
  border: 1px solid rgba(43, 52, 68, .24);
  border-radius: var(--about-radius);
  background: rgba(255, 255, 255, .5);
  box-shadow: inset 0 0 0 6px rgba(255, 255, 255, .34);
  transition: transform .22s ease, box-shadow .22s ease;
}
.page-about .about-evi:hover {
  transform: translateY(-3px);
  box-shadow: inset 0 0 0 6px rgba(255, 255, 255, .48), 0 16px 30px rgba(43, 52, 68, .14);
}
.page-about .about-evi__badge {
  position: absolute;
  top: -11px;
  left: 20px;
}
.page-about .about-evi__title {
  margin: 8px 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--about-dark-body);
}
.page-about .about-evi__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-body);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  position: relative;
}
.page-about .about-tl__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
  overflow: hidden;
  border-radius: var(--about-radius);
}
.page-about .about-tl__media img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .15;
  filter: saturate(1.15);
}
.page-about .about-tl__list {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
}
.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(232, 163, 61, .12));
}
.page-about .tl-item {
  position: relative;
  margin-bottom: 20px;
}
.page-about .tl-item:last-child {
  margin-bottom: 0;
}
.page-about .tl-item__dot {
  position: absolute;
  left: -33px;
  top: 26px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 5px rgba(232, 163, 61, .13);
}
.page-about .tl-item__card {
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(246, 241, 230, .07), rgba(14, 21, 34, .86));
  transition: transform .22s ease, border-color .22s ease;
}
.page-about .tl-item:hover .tl-item__card {
  transform: translateY(-3px);
  border-color: var(--line-gold);
}
.page-about .tl-item__kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--lake);
}
.page-about .tl-item__title {
  margin: 0 0 11px;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--star);
}
.page-about .tl-item__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .tl-item__stats {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--gold);
}

/* ---------- 团队 ---------- */
.page-about .about-media {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
}
.page-about .about-media img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-role {
  padding: 22px 20px;
  border-left: 3px solid var(--lake);
  background: linear-gradient(90deg, rgba(28, 143, 196, .12), transparent 78%);
  border-radius: 0 var(--about-radius) var(--about-radius) 0;
}
.page-about .about-role__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--lake);
}
.page-about .about-role__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  color: var(--star);
}
.page-about .about-role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: center;
}
.page-about .about-eco-figure {
  display: flex;
  justify-content: center;
}
.page-about .about-eco {
  width: min(100%, 360px);
  height: auto;
}
.page-about .about-eco-copy {
  display: grid;
  gap: 14px;
}
.page-about .about-eco-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(24, 34, 52, .62);
}
.page-about .about-eco-item__num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 34px);
  line-height: 1;
  color: var(--gold);
}
.page-about .about-eco-item__title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--star);
}
.page-about .about-eco-item__text {
  grid-column: 2;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}
.page-about .about-media--eco {
  margin-top: clamp(22px, 3.4vw, 36px);
  margin-bottom: 0;
}

/* ---------- 资质 ---------- */
.page-about .about-trust {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(43, 52, 68, .18);
  border: 1px solid rgba(43, 52, 68, .18);
  border-radius: var(--about-radius);
  overflow: hidden;
}
.page-about .about-trust__item {
  padding: 20px 18px 22px;
  background: rgba(255, 255, 255, .64);
}
.page-about .about-trust__k {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: #7A8194;
}
.page-about .about-trust__v {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--about-dark-body);
}
.page-about .about-trust__v.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--lake-deep);
}
.page-about .about-trust__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 勘误 ---------- */
.page-about .about-corrections {
  background:
    radial-gradient(80% 60% at 90% 0%, rgba(232, 163, 61, .16), transparent 60%),
    linear-gradient(180deg, var(--lake-deep), var(--ink-900) 78%);
}
.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  padding: 0;
  list-style: none;
  counter-reset: none;
}
.page-about .about-step {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px solid rgba(238, 244, 250, .18);
  border-radius: var(--about-radius);
  background: rgba(11, 17, 27, .5);
}
.page-about .about-step__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--gold);
}
.page-about .about-step__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 800;
  color: var(--star);
}
.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-corrections__cta {
  display: grid;
  gap: 16px;
  padding: 22px 20px;
  border: 1px dashed var(--line-gold);
  border-radius: var(--about-radius);
  background: rgba(232, 163, 61, .07);
}
.page-about .about-corrections__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}
.page-about .about-corrections__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-trust {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-corrections__cta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
  .page-about .about-corrections__btns {
    justify-content: flex-end;
  }
}

@media (min-width: 900px) {
  .page-about .about-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-eco-wrap {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }
  .page-about .about-tl__list {
    padding-left: 0;
  }
  .page-about .about-tl__list::before {
    left: 50%;
    transform: translateX(-1px);
  }
  .page-about .tl-item {
    width: calc(50% - 44px);
    margin-bottom: 30px;
  }
  .page-about .tl-item:nth-child(odd) {
    margin-right: auto;
  }
  .page-about .tl-item:nth-child(even) {
    margin-left: auto;
  }
  .page-about .tl-item:nth-child(odd) .tl-item__dot {
    left: auto;
    right: -35px;
  }
  .page-about .tl-item:nth-child(even) .tl-item__dot {
    left: -53px;
  }
}

@media (min-width: 980px) {
  .page-about .about-cover__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, .85fr);
    align-items: start;
  }
  .page-about .about-cover__aside {
    padding-top: 52px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-trust {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pillar,
  .page-about .about-evi,
  .page-about .tl-item__card,
  .page-about .about-index__link {
    transition-duration: .01ms;
  }
  .page-about .about-pillar:hover,
  .page-about .about-evi:hover,
  .page-about .tl-item:hover .tl-item__card {
    transform: none;
  }
}