.page-about {
  background:
    radial-gradient(1100px 520px at 84% -6%, rgba(47, 212, 198, 0.10), transparent 68%),
    radial-gradient(800px 460px at 0% 18%, rgba(18, 41, 74, 0.60), transparent 70%),
    var(--c-ink);
  color: var(--c-text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  padding: 22px 0 30px;
}

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

.page-about .about-hero__title {
  margin: 12px 0 0;
  color: var(--c-title);
  font-size: clamp(29px, 5.4vw, 52px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__aside {
  min-width: 0;
  padding-left: 18px;
  border-left: 2px solid var(--c-teal);
}

.page-about .about-hero__aside .lede {
  margin: 0;
  max-width: 46ch;
}

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

.page-about .about-hero__media {
  margin: 0 0 8px;
}

/* ---------- 非对称长文骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding: 40px 0 72px;
}

/* ---------- 左侧章节目录 ---------- */
.page-about .about-toc {
  align-self: start;
  padding: 16px 18px;
  background: var(--c-glass);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  backdrop-filter: blur(6px);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  color: var(--c-gold);
}

.page-about .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .toc-list li + li {
  margin-top: 2px;
}

.page-about .toc-link {
  display: block;
  padding: 7px 0 7px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-text);
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--c-teal-soft);
  border-left-color: var(--c-teal);
  background: rgba(47, 212, 198, 0.06);
}

.page-about .toc-link.is-current {
  color: var(--c-gold-soft);
  border-left-color: var(--c-gold);
  background: rgba(231, 183, 94, 0.08);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .chapter {
  scroll-margin-top: 110px;
  padding-bottom: 46px;
}

.page-about .chapter + .chapter {
  border-top: 1px solid var(--line-soft);
  padding-top: 44px;
}

.page-about .chapter__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 18px;
}

.page-about .chapter__head .h2 {
  margin: 0;
  color: var(--c-title);
}

.page-about .chapter-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  line-height: 0.9;
  color: var(--c-gold);
  letter-spacing: -0.02em;
}

.page-about .prose p {
  max-width: 68ch;
}

.page-about .prose p + p {
  margin-top: 1.1em;
}

.page-about .prose a {
  color: var(--c-teal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 232, 224, 0.35);
}

.page-about .prose a:hover {
  color: var(--c-teal);
  border-bottom-color: var(--c-teal);
}

.page-about .link-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--c-teal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 232, 224, 0.4);
}

.page-about .link-more:hover {
  color: var(--c-teal);
}

/* ---------- 使用场景 ---------- */
.page-about .scenario-grid {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .scenario {
  padding: 20px;
  background: var(--c-card);
  border: 1px solid rgba(47, 212, 198, 0.14);
  border-radius: var(--r-m);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .scenario:hover {
  transform: translateY(-2px);
  border-color: rgba(47, 212, 198, 0.55);
  box-shadow: var(--shadow);
}

.page-about .scenario__tag {
  margin: 0 0 10px;
  color: var(--c-teal);
}

.page-about .scenario .h3 {
  margin: 0 0 8px;
  color: var(--c-title);
}

.page-about .scenario p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 覆盖范围 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

.page-about .coverage-copy p {
  max-width: 56ch;
}

.page-about .coverage-media {
  margin: 0;
}

.page-about .stat-row {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 18px 18px;
  background: var(--c-ink-2);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 40px);
  line-height: 1;
  color: var(--c-title);
  letter-spacing: -0.02em;
}

.page-about .stat__unit {
  font-size: 14px;
  color: var(--c-text);
}

.page-about .stat__meter {
  display: block;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-teal), rgba(47, 212, 198, 0));
}

.page-about .stat:nth-child(1) .stat__meter { width: 52%; }
.page-about .stat:nth-child(2) .stat__meter { width: 76%; }
.page-about .stat:nth-child(3) .stat__meter { width: 64%; }
.page-about .stat:nth-child(4) .stat__meter { width: 88%; }

/* ---------- 团队分工 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--c-ink-2);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  border-top: 2px solid var(--c-teal);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 38px;
  line-height: 1;
  color: var(--c-gold-soft);
  letter-spacing: -0.02em;
}

.page-about .team-card .h3 {
  margin: 10px 0 8px;
  color: var(--c-title);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 版本阶段 ---------- */
.page-about .version-media {
  margin: 26px 0 4px;
}

.page-about .version-scroll {
  overflow-x: auto;
  padding: 12px 2px 18px;
  -webkit-overflow-scrolling: touch;
}

.page-about .version-track {
  position: relative;
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  min-width: 640px;
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: linear-gradient(90deg, rgba(47, 212, 198, 0.18), rgba(231, 183, 94, 0.6));
  transform: translateY(-50%);
}

.page-about .version-track__node {
  position: relative;
  flex: 1 1 0;
  display: flex;
  justify-content: center;
}

.page-about .version-track__dot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--c-ink-2);
  border: 1px solid rgba(47, 212, 198, 0.35);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--c-teal-soft);
}

.page-about .version-track__node.is-current .version-track__dot {
  background: rgba(231, 183, 94, 0.16);
  border-color: var(--c-gold);
  color: var(--c-gold-soft);
  box-shadow: 0 0 0 4px rgba(231, 183, 94, 0.12);
}

.page-about .stage-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .stage__idx {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .stage .h3 {
  margin: 0 0 6px;
  color: var(--c-title);
}

.page-about .stage__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 收录与保留 ---------- */
.page-about .intake-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  counter-reset: intake;
}

.page-about .intake {
  padding: 18px 20px;
  background: var(--c-glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--c-gold);
  border-radius: var(--r-s);
}

.page-about .intake__step {
  display: block;
  margin: 0 0 8px;
  color: var(--c-gold-soft);
}

.page-about .intake p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

/* ---------- 服务网络 ---------- */
.page-about .glass-note {
  margin-top: 26px;
  padding: 20px 22px;
  background: var(--c-glass-deep);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  backdrop-filter: blur(8px);
}

.page-about .glass-note__k {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-teal);
}

.page-about .glass-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .glass-note__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .glass-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-teal);
}

/* ---------- 联系入口 ---------- */
.page-about .contact-panel {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-m);
  overflow: hidden;
}

.page-about .contact-item {
  padding: 20px;
  background: var(--c-card);
}

.page-about .contact-item__k {
  margin: 0 0 8px;
  color: var(--c-teal-soft);
}

.page-about .contact-item__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .contact-item__v a {
  color: var(--c-teal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 232, 224, 0.35);
}

.page-about .contact-item__v a:hover {
  color: var(--c-teal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .scenario-grid,
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .stage {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .stage__idx {
    padding-top: 4px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: end;
    padding: 38px 0 44px;
  }

  .page-about .scenario-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 40px;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(190px, 232px) minmax(0, 1fr);
    gap: 56px;
    padding: 56px 0 110px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 104px;
  }

  .page-about .chapter {
    padding-bottom: 68px;
  }

  .page-about .chapter + .chapter {
    padding-top: 62px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .scenario,
  .page-about .toc-link {
    transition: none;
  }

  .page-about .scenario:hover {
    transform: none;
  }
}