.page-about {
  --about-line: #1B2740;
  --about-rail: 38px;
  background: var(--sx-deep);
  color: var(--sx-white);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .sx-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-family: var(--sx-ff-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--sx-mist);
}

.page-about .sx-crumbs a {
  color: var(--sx-cyan);
  text-decoration: none;
}

.page-about .sx-crumbs a:hover,
.page-about .sx-crumbs a:focus-visible {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 7vw, 78px) 0 clamp(34px, 6vw, 66px);
  background:
    radial-gradient(120% 96% at 90% 4%, rgba(70, 239, 210, .16), transparent 58%),
    radial-gradient(96% 76% at -6% 104%, rgba(180, 89, 59, .16), transparent 62%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
}

.page-about .about-hero__copy {
  max-width: 40ch;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 5vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-hero__facts li {
  display: grid;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__n {
  font-family: var(--sx-ff-mono);
  font-size: clamp(24px, 5vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--sx-cyan);
}

.page-about .about-hero__t {
  font-size: 13px;
  line-height: 1.65;
  color: var(--sx-mist);
}

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

.page-about .about-hero__fig .sx-figure__img {
  width: 100%;
  height: auto;
  border-radius: 24px 8px 24px 8px;
  border: 1px solid var(--about-line);
}

/* ---------- 时间线 ---------- */
.page-about .about-chron__lead {
  max-width: 46ch;
  color: var(--sx-mist);
}

.page-about .tl {
  list-style: none;
  position: relative;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--sx-cyan) 0%, rgba(70, 239, 210, .35) 52%, rgba(124, 141, 166, .25) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-left: var(--about-rail);
}

.page-about .tl__node {
  position: absolute;
  left: 0;
  top: 22px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--sx-deep);
  border: 2px solid var(--sx-cyan);
  box-shadow: 0 0 0 4px rgba(70, 239, 210, .12);
}

.page-about .tl__card {
  margin: 0 0 16px;
  background: var(--sx-slate);
  border: 1px solid var(--about-line);
  border-radius: 16px 6px 16px 6px;
  transition: border-color .2s var(--sx-ease);
}

.page-about .tl__card:hover {
  border-color: rgba(70, 239, 210, .42);
}

.page-about .tl__sum {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 16px 18px;
}

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

.page-about .tl__sum::after {
  content: "+";
  font-family: var(--sx-ff-mono);
  font-size: 15px;
  color: var(--sx-mist);
}

.page-about .tl__card[open] .tl__sum::after {
  content: "–";
  color: var(--sx-cyan);
}

.page-about .tl__sum:focus-visible {
  outline: 2px solid var(--sx-cyan);
  outline-offset: 2px;
  border-radius: 16px 6px 0 0;
}

.page-about .tl__no {
  font-size: 12px;
  color: var(--sx-cyan);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--sx-ff-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -.01em;
  color: var(--sx-white);
}

.page-about .tl__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-line);
  margin-top: 2px;
  padding-top: 14px;
}

.page-about .tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sx-mist);
  max-width: 40ch;
}

/* ---------- 流程刻度带 ---------- */
.page-about .about-flow__lead {
  max-width: 48ch;
  color: var(--sx-mist);
}

.page-about .about-flow__figure {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-flow__figure .sx-figure__img {
  width: 100%;
  height: auto;
  border-radius: 8px 24px 8px 24px;
  border: 1px solid var(--about-line);
}

.page-about .flow {
  margin-top: clamp(22px, 4vw, 34px);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  padding-bottom: 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--sx-slate) transparent;
}

.page-about .flow:focus-visible {
  outline: 2px solid var(--sx-cyan);
  outline-offset: 6px;
}

.page-about .flow::-webkit-scrollbar {
  height: 6px;
}

.page-about .flow::-webkit-scrollbar-thumb {
  background: var(--sx-slate);
  border-radius: 3px;
}

.page-about .flow__track {
  list-style: none;
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 2px;
}

.page-about .flow__step {
  flex: 0 0 min(80%, 268px);
  scroll-snap-align: start;
  padding: 18px 18px 20px;
  background: var(--sx-slate);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--sx-clay);
  border-radius: 14px;
  transition: border-color .22s var(--sx-ease), transform .22s var(--sx-ease);
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-within {
  border-left-color: var(--sx-cyan);
  transform: translateY(-3px);
}

.page-about .flow__no {
  font-size: 12px;
  color: var(--sx-cyan);
}

.page-about .flow__name {
  margin: 8px 0 8px;
  font-family: var(--sx-ff-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--sx-white);
}

.page-about .flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--sx-mist);
}

.page-about .flow__fields {
  margin: 14px 0 0;
  font-family: var(--sx-ff-mono);
  font-size: 11.5px;
  letter-spacing: .02em;
  color: var(--sx-orange);
  opacity: .76;
  transition: opacity .2s var(--sx-ease);
}

.page-about .flow__step:hover .flow__fields,
.page-about .flow__step:focus-within .flow__fields {
  opacity: 1;
}

/* ---------- 九个小组 ---------- */
.page-about .about-squads__lead {
  max-width: 46ch;
  color: var(--sx-mist);
}

.page-about .squads {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .squads__ringwrap {
  position: relative;
  width: 210px;
  height: 210px;
  margin: 0 auto;
}

.page-about .squads__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from -90deg,
    var(--sx-cyan) 0deg 65.5deg,
    var(--sx-deep) 65.5deg 67.5deg,
    var(--sx-orange) 67.5deg 116.6deg,
    var(--sx-deep) 116.6deg 118.6deg,
    var(--sx-moss) 118.6deg 159.6deg,
    var(--sx-deep) 159.6deg 161.6deg,
    var(--sx-clay) 161.6deg 202.6deg,
    var(--sx-deep) 202.6deg 204.6deg,
    var(--sx-mist) 204.6deg 237.3deg,
    var(--sx-deep) 237.3deg 239.3deg,
    var(--sx-rust) 239.3deg 272deg,
    var(--sx-deep) 272deg 274deg,
    var(--sx-cyan) 274deg 306.7deg,
    var(--sx-deep) 306.7deg 308.7deg,
    var(--sx-orange) 308.7deg 333.3deg,
    var(--sx-deep) 333.3deg 335.3deg,
    var(--sx-clay) 335.3deg 360deg);
  -webkit-mask: radial-gradient(closest-side, transparent 55%, #000 56%);
  mask: radial-gradient(closest-side, transparent 55%, #000 56%);
}

.page-about .squads__ringcore {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sx-ff-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--sx-white);
}

.page-about .squads__list {
  list-style: none;
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
}

.page-about .squads__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  padding: 11px 13px;
  background: rgba(37, 48, 68, .62);
  border-radius: 10px;
  border-left: 2px solid transparent;
  transition: border-color .2s var(--sx-ease), background .2s var(--sx-ease);
}

.page-about .squads__item:hover {
  border-left-color: var(--sx-cyan);
  background: rgba(37, 48, 68, .92);
}

.page-about .squads__no {
  font-size: 11px;
  color: var(--sx-cyan);
  line-height: 1.6;
}

.page-about .squads__name {
  font-size: 14px;
  line-height: 1.6;
  color: var(--sx-white);
}

.page-about .squads__meta {
  grid-column: 2;
  font-family: var(--sx-ff-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--sx-mist);
}

/* ---------- 类目体系 ---------- */
.page-about .about-cats__grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-cats__copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sx-mist);
  max-width: 38em;
}

.page-about .cats__index {
  display: grid;
  gap: 4px;
}

.page-about .cats__index .sx-index__item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 11px 14px;
  background: rgba(27, 39, 64, .72);
  border-radius: 10px;
  border-left: 2px solid transparent;
  transition: border-color .2s var(--sx-ease);
}

.page-about .cats__index .sx-index__item:hover {
  border-left-color: var(--sx-cyan);
}

.page-about .cats__index .sx-index__no {
  font-family: var(--sx-ff-mono);
  font-size: 11px;
  color: var(--sx-clay);
}

.page-about .cats__index .sx-index__name {
  font-size: 14px;
  color: var(--sx-white);
}

.page-about .cats__index .sx-index__meta {
  font-family: var(--sx-ff-mono);
  font-size: 12px;
  color: var(--sx-mist);
}

/* ---------- 米白规矩区 ---------- */
.page-about .about-rules__panel {
  padding: clamp(26px, 4.5vw, 50px);
  border-radius: 28px 10px 28px 10px;
}

.page-about .about-rules__panel .sx-h2,
.page-about .about-rules__panel .rules__t,
.page-about .about-rules__panel p {
  color: var(--sx-ink);
}

.page-about .about-rules__kicker {
  color: var(--sx-clay);
}

.page-about .rules {
  list-style: none;
  display: grid;
  gap: 22px;
  margin: clamp(20px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.page-about .rules__item {
  padding-top: 14px;
  border-top: 2px solid rgba(5, 16, 31, .82);
}

.page-about .rules__no {
  font-family: var(--sx-ff-mono);
  font-size: 12px;
  color: var(--sx-clay);
}

.page-about .rules__t {
  margin: 8px 0 8px;
  font-family: var(--sx-ff-head);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .rules__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 内容伙伴 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 4vw, 42px);
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-partners__copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--sx-mist);
  max-width: 40em;
}

.page-about .about-partners__cta {
  margin-top: 22px;
}

.page-about .partners__list {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.page-about .partners__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--about-line);
  border-radius: 4px 14px 4px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sx-mist);
}

.page-about .partners__item .sx-num {
  font-family: var(--sx-ff-mono);
  font-size: 11px;
  color: var(--sx-moss);
  line-height: 1.9;
}

/* ---------- 使用强度 ---------- */
.page-about .scale {
  display: grid;
  gap: 20px;
  margin: clamp(24px, 4vw, 38px) 0 clamp(20px, 3vw, 30px);
}

.page-about .scale__item {
  display: grid;
  gap: 8px;
  padding-top: 13px;
  border-top: 1px solid var(--about-line);
}

.page-about .scale__n {
  font-family: var(--sx-ff-mono);
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--sx-cyan);
}

.page-about .scale__t {
  font-size: 13px;
  line-height: 1.65;
  color: var(--sx-mist);
}

.page-about .scale__notes p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--sx-mist);
  max-width: 44em;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-cta__fig {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .about-cta__fig .sx-figure__img {
  width: 100%;
  height: auto;
  border-radius: 10px 28px 10px 28px;
  border: 1px solid var(--about-line);
}

.page-about .about-cta__body .sx-h2 {
  max-width: 22ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 370px);
    align-items: end;
  }

  .page-about .tl__item:nth-child(odd) {
    padding-right: 18%;
  }

  .page-about .tl__item:nth-child(even) {
    padding-right: 4%;
  }

  .page-about .squads {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cats__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  }

  .page-about .flow__step {
    flex-basis: 288px;
  }
}

@media (min-width: 1000px) {
  .page-about .rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .tl__card {
    transition: none;
  }

  .page-about .flow__step:hover,
  .page-about .flow__step:focus-within {
    transform: none;
  }
}