.page-about {
  --about-rail-w: 208px;
  --about-max-text: 42em;
  background: var(--ink-black);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(34px, 6vw, 78px)) 0 clamp(44px, 6vw, 84px);
  background:
    radial-gradient(120% 96% at 92% -8%, rgba(31, 91, 255, .34), transparent 60%),
    radial-gradient(80% 70% at 0% 106%, rgba(0, 229, 208, .13), transparent 68%),
    linear-gradient(180deg, var(--ink-black) 0%, var(--midnight) 100%);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(215, 222, 232, .05) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(215, 222, 232, .05) 0 1px, transparent 1px 64px);
  -webkit-mask-image: radial-gradient(78% 70% at 58% 34%, #000 18%, transparent 78%);
  mask-image: radial-gradient(78% 70% at 58% 34%, #000 18%, transparent 78%);
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(24px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--graphite);
}

.page-about .breadcrumb a {
  color: var(--electric-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--electric);
  border-bottom-color: var(--electric);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

.page-about .crumb-sep {
  color: var(--graphite);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 44px);
}

.page-about .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--electric);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.01em;
}

.page-about .about-hero-lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: clamp(1rem, 1.5vw, 1.06rem);
  line-height: 1.82;
  color: rgba(246, 248, 251, .78);
}

.page-about .about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-hero-facts li {
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--graphite);
}

.page-about .about-hero-facts .mono {
  margin-right: 7px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--electric);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-dark-strong);
  background: var(--deep-sea);
  overflow: hidden;
}

.page-about .about-hero-media::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 48px;
  height: 3px;
  background: var(--electric);
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

/* ---------- 双轴骨架 ---------- */
.page-about .about-axis {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 48px);
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

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

.page-about .about-rail {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line-dark);
  background: rgba(11, 18, 32, .72);
}

.page-about .index-rail-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--graphite);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-rail-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail .index-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--line-dark-strong);
  border-radius: 999px;
  background: transparent;
  color: rgba(246, 248, 251, .7);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: .02em;
  white-space: nowrap;
  cursor: pointer;
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-rail .index-link:hover,
.page-about .about-rail .index-link:focus-visible {
  color: var(--paper);
  border-color: var(--electric);
  background: rgba(0, 229, 208, .09);
  outline: none;
}

.page-about .about-rail .index-link:focus-visible {
  box-shadow: 0 0 0 2px var(--electric);
}

.page-about .about-rail .index-link[data-active="true"] {
  color: var(--electric);
  border-color: var(--electric);
  background: rgba(0, 229, 208, .12);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(30px, 4vw, 46px);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .section-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--electric);
  text-transform: uppercase;
}

.page-about .about-section h2 {
  margin: 0 0 20px;
  max-width: 22em;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -.005em;
}

.page-about .about-prose p,
.page-about .about-lead-sm {
  margin: 0 0 16px;
  max-width: var(--about-max-text);
  font-size: 16px;
  line-height: 1.78;
  color: rgba(246, 248, 251, .76);
}

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

.page-about .about-inline-link {
  color: var(--electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 208, .4);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--electric-soft);
  border-bottom-color: var(--electric-soft);
}

/* ---------- 数据窄栏 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 6px 0 26px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-stat {
  position: relative;
  padding: 20px 16px 22px;
  background: linear-gradient(180deg, var(--midnight), var(--ink-black));
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tech-blue), var(--electric));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .5s var(--ease);
}

.page-about .about-stat:hover::after,
.page-about .about-stat:focus-within::after {
  transform: scaleX(1);
}

.page-about .stat-num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--electric);
}

.page-about .stat-label {
  display: block;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--graphite);
}

.page-about .about-schema {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding: 16px 18px;
  border: 1px dashed var(--line-dark-strong);
  background: rgba(18, 32, 58, .42);
}

.page-about .about-schema span {
  padding: 6px 12px;
  border: 1px solid rgba(0, 229, 208, .35);
  background: rgba(0, 229, 208, .1);
  color: var(--electric-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-schema i {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--graphite);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .about-figure {
  position: relative;
  margin: 0 0 26px;
  border: 1px solid var(--line-dark);
  background: var(--deep-sea);
  overflow: hidden;
}

.page-about .about-split .about-figure {
  margin-bottom: 0;
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line-dark);
  background: rgba(5, 7, 12, .62);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--graphite);
  line-height: 1.6;
}

.page-about .about-archive-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-archive-list li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-archive-list .mono {
  grid-row: span 2;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--electric);
}

.page-about .about-archive-list strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-archive-list em {
  font-style: normal;
  font-size: 13px;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------- 校对流程 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .about-step {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, var(--midnight), var(--ink-black));
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--tech-blue), var(--electric));
}

.page-about .step-index {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .about-step h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(246, 248, 251, .68);
}

.page-about .about-note {
  margin: 24px 0 0;
  max-width: var(--about-max-text);
  padding: 14px 18px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 194, 75, .07);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(246, 248, 251, .72);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  background: linear-gradient(180deg, rgba(11, 18, 32, .96), rgba(5, 7, 12, .96));
  transition: background .3s var(--ease), transform .3s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  background: linear-gradient(180deg, rgba(18, 32, 58, .96), rgba(11, 18, 32, .96));
  transform: translateY(-2px);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: -2px;
}

.page-about .team-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 14px;
  background: var(--electric);
  color: var(--ink-black);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 248, 251, .68);
}

.page-about .team-card .team-more {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--electric-soft);
  font-size: 13px;
  transition: max-height .35s var(--ease), opacity .28s var(--ease), margin-top .35s var(--ease);
}

.page-about .team-card:hover .team-more,
.page-about .team-card:focus-within .team-more {
  max-height: 90px;
  margin-top: 10px;
  opacity: 1;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .about-partner-grid article {
  padding: 18px 18px 20px;
  border: 1px solid var(--line-dark);
  border-top: 2px solid var(--tech-blue);
  background: rgba(18, 32, 58, .38);
}

.page-about .about-partner-grid article:nth-child(2) {
  border-top-color: var(--electric);
}

.page-about .about-partner-grid article:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-partner-grid .mono {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--electric-soft);
}

.page-about .about-partner-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(246, 248, 251, .7);
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stages {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 10px;
  padding-top: 34px;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--tech-blue), var(--electric) 55%, var(--amber));
  opacity: .55;
}

.page-about .about-stage {
  position: relative;
  padding-right: 10px;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: -22px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-black);
  border: 2px solid var(--electric);
}

.page-about .stage-mark {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .about-stage h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-stage p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(246, 248, 251, .7);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line-dark);
}

.page-about .about-cta-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: clamp(26px, 4vw, 44px);
  border: 1px solid var(--line-dark-strong);
  background:
    radial-gradient(120% 140% at 90% 0%, rgba(31, 91, 255, .34), transparent 62%),
    linear-gradient(180deg, var(--midnight), var(--ink-black));
}

.page-about .about-cta-panel::before,
.page-about .about-cta-panel::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--electric);
  opacity: .6;
}

.page-about .about-cta-panel::before {
  top: -1px;
  left: -1px;
  border-width: 1px 0 0 1px;
}

.page-about .about-cta-panel::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 1px 1px 0;
}

.page-about .about-cta-panel h2 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  font-weight: 800;
  line-height: 1.28;
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(246, 248, 251, .76);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta-actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  text-decoration: none;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 68px);
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 820px) {
  .page-about .about-stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-axis {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(48px, 6vw, 88px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    padding: 0;
    border: none;
    background: transparent;
  }

  .page-about .about-rail-list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-list li {
    margin-bottom: 2px;
  }

  .page-about .about-rail .index-link {
    display: block;
    width: 100%;
    min-height: 44px;
    padding: 10px 14px;
    border: none;
    border-left: 2px solid var(--line-dark-strong);
    border-radius: 0;
    background: transparent;
    text-align: left;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .about-rail .index-link:hover,
  .page-about .about-rail .index-link:focus-visible {
    background: rgba(0, 229, 208, .09);
  }

  .page-about .about-rail .index-link[data-active="true"] {
    background: rgba(0, 229, 208, .1);
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .team-card .team-more {
    max-height: none;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .page-about .team-card,
  .page-about .team-card .team-more,
  .page-about .about-stat::after {
    transition: none;
  }

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