.page-about {
  display: block;
  background: var(--ink);
  color: var(--ice);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .about-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 90;
  background: rgba(244, 247, 251, 0.06);
  pointer-events: none;
}

.page-about .about-progress .scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--neon), var(--gold));
}

/* ---------- 首屏拼贴 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4.5vw, 52px) 0 clamp(30px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(43, 233, 123, 0.13), transparent 58%),
    radial-gradient(90% 80% at 95% 6%, rgba(46, 140, 255, 0.15), transparent 60%),
    var(--ink);
  border-bottom: 1px solid var(--edge);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -34%;
  width: 58%;
  height: 170%;
  background: linear-gradient(160deg, rgba(43, 233, 123, 0.09), transparent 68%);
  transform: rotate(-14deg);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__collage {
  display: grid;
  gap: var(--gap);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__lead {
  border: 1px solid var(--edge);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 34px);
  background: linear-gradient(180deg, rgba(14, 20, 32, 0.97), rgba(7, 9, 13, 0.9));
}

.page-about .about-hero__lead h1 {
  margin: 16px 0 14px;
  font-size: clamp(28px, 5.4vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--ice);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__lede strong {
  color: var(--neon);
  font-weight: 700;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-hero__stat {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 16px 16px 18px;
  background: var(--ink-2);
}

.page-about .about-hero__stat b {
  font-family: var(--font-mono);
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -0.02em;
}

.page-about .about-hero__stat span {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__seal {
  display: grid;
  place-items: center;
  padding: 20px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background:
    repeating-linear-gradient(-45deg, rgba(43, 233, 123, 0.05) 0 10px, transparent 10px 20px),
    var(--ink-2);
}

.page-about .about-hero__seal-inner {
  display: grid;
  place-content: center;
  gap: 6px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 6px rgba(43, 233, 123, 0.08);
  text-align: center;
}

.page-about .about-hero__seal-inner b {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-hero__seal-inner span {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ---------- 主体双栏 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
  padding-top: clamp(30px, 5vw, 60px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .about-rail {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-rail__block {
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background: var(--ink-2);
  padding: 16px 16px 18px;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--blue);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  counter-reset: idx;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.page-about .about-index a::before {
  counter-increment: idx;
  content: counter(idx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--blue);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--neon);
  background: rgba(43, 233, 123, 0.08);
  border-left-color: var(--neon);
}

.page-about .version-track {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  display: grid;
  gap: 4px;
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--blue) 55%, var(--edge));
}

.page-about .version-node {
  position: relative;
  display: grid;
  gap: 3px;
  padding: 7px 9px 8px;
  border-radius: var(--radius);
  outline: none;
  transition: background var(--ease), transform var(--ease);
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 13px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--blue);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .version-node:hover,
.page-about .version-node:focus-visible {
  background: rgba(46, 140, 255, 0.1);
  transform: translateX(2px);
}

.page-about .version-node:hover::before,
.page-about .version-node:focus-visible::before {
  border-color: var(--neon);
  background: var(--neon);
}

.page-about .version-node:focus-visible {
  box-shadow: 0 0 0 2px var(--blue);
}

.page-about .version-node__id {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .version-node__name {
  font-size: 13.5px;
  color: var(--ice);
  line-height: 1.5;
}

.page-about .version-node__tip {
  display: none;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .version-node:hover .version-node__tip,
.page-about .version-node:focus-visible .version-node__tip,
.page-about .version-node:focus .version-node__tip {
  display: block;
}

/* ---------- 正文内容 ---------- */

.page-about .about-content {
  display: grid;
  gap: clamp(28px, 4vw, 54px);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 104px;
  min-width: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon);
}

.page-about .about-section h2 {
  margin: 0;
  font-size: clamp(21px, 2.7vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-text p strong {
  color: var(--ice);
  font-weight: 600;
}

.page-about .about-link {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 140, 255, 0.4);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
  outline: none;
}

.page-about .about-inline-cta {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* 项目格 */

.page-about .sport-grid {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(102px, 1fr));
}

.page-about .sport-grid li {
  padding: 13px 8px;
  text-align: center;
  font-size: 14px;
  color: var(--ice);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: rgba(14, 20, 32, 0.85);
  transition: border-color var(--ease), color var(--ease), transform var(--ease);
}

.page-about .sport-grid li:hover {
  border-color: var(--neon);
  color: var(--neon);
  transform: translateY(-2px);
}

/* 图文错位 */

.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  margin-top: 22px;
}

.page-about .about-banner {
  margin: 0 0 22px;
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-split__body {
  min-width: 0;
}

/* 审核流程 */

.page-about .flow-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .flow-steps li {
  padding: 15px 16px 17px;
  border: 1px solid var(--edge);
  border-top: 3px solid var(--orange);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .flow-steps b {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .flow-steps span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 版本并轨对比条 */

.page-about .lane-compare {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .lane-compare li {
  display: grid;
  gap: 4px;
  padding: 13px 15px;
  border: 1px solid var(--edge);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  background: var(--ink-2);
  transition: border-color var(--ease), background var(--ease);
}

.page-about .lane-compare li:hover {
  border-left-color: var(--neon);
  background: rgba(46, 140, 255, 0.08);
}

.page-about .lane-compare b {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.page-about .lane-compare span {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* 合作生态卡片 */

.page-about .partner-grid {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partner-grid li {
  padding: 18px 16px 18px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background: var(--ink-2);
  box-shadow: 6px 6px 0 rgba(31, 58, 51, 0.55);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.page-about .partner-grid li:hover {
  transform: translate(-3px, -3px);
  box-shadow: 10px 10px 0 rgba(43, 233, 123, 0.18);
  border-color: var(--neon);
}

.page-about .partner-grid h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .partner-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* 合规 */

.page-about .compliance {
  display: grid;
  gap: 18px;
}

.page-about .compliance-card {
  padding: 18px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, rgba(14, 20, 32, 0.98), rgba(7, 9, 13, 0.92));
}

.page-about .compliance-card dl {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .compliance-card dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .compliance-card dd {
  margin: 3px 0 0;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

/* 收尾 */

.page-about .about-cta {
  display: grid;
  gap: 14px;
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--edge);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 130% at 100% 0%, rgba(46, 140, 255, 0.18), transparent 62%),
    var(--ink-2);
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(20px, 2.5vw, 27px);
  letter-spacing: -0.015em;
  color: var(--ice);
}

.page-about .about-cta p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-split--reverse .about-split__media {
    order: -1;
  }

  .page-about .compliance {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__collage {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    grid-template-areas:
      "lead stats"
      "lead seal";
    align-items: stretch;
  }

  .page-about .about-hero__lead {
    grid-area: lead;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-hero__stats {
    grid-area: stats;
  }

  .page-about .about-hero__seal {
    grid-area: seal;
  }
}

@media (min-width: 1020px) {
  .page-about .about-body {
    grid-template-columns: minmax(250px, 300px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .sport-grid li:hover,
  .page-about .version-node:hover,
  .page-about .partner-grid li:hover {
    transform: none;
  }

  .page-about .about-progress .scroll-progress__bar,
  .page-about .version-node,
  .page-about .version-node::before,
  .page-about .partner-grid li,
  .page-about .about-index a {
    transition: none;
  }
}