.page-about {
  display: block;
  background: var(--deep);
  color: var(--star);
  padding-bottom: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-top {
  position: relative;
  overflow: hidden;
  padding: 36px 0 56px;
  background:
    radial-gradient(760px 420px at 8% -18%, rgba(123, 77, 255, .42), transparent 70%),
    radial-gradient(620px 380px at 96% 4%, rgba(41, 227, 214, .16), transparent 72%),
    var(--deep);
}

.page-about .about-top__glow {
  position: absolute;
  left: 22%;
  right: -14%;
  bottom: -46%;
  height: 520px;
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(123, 77, 255, .32), rgba(41, 227, 214, .09) 58%, transparent 78%);
  animation: about-drift 32s var(--ease) infinite;
}

@keyframes about-drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-46px, -34px, 0) scale(1.09); }
}

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

.page-about .about-top h1 {
  margin: 16px 0 0;
  max-width: 14em;
  font-size: clamp(34px, 7.4vw, 74px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  text-shadow: 0 0 22px rgba(123, 77, 255, .5), 0 0 46px rgba(41, 227, 214, .2);
}

.page-about .about-top__lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  max-width: 720px;
  margin: 40px 0 0;
  padding: 0;
}

.page-about .about-stats__item {
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(19, 26, 69, .92), rgba(11, 16, 48, .68));
}

.page-about .about-stats dt {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-stats dd {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}

.page-about .about-stats__num {
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: var(--star);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 18px rgba(41, 227, 214, .45);
}

/* ---------- 章节锚点导航 ---------- */
.page-about .section-nav {
  margin: 10px 0 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .section-nav::-webkit-scrollbar {
  display: none;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: 60px 0;
}

.page-about .about-chapter--tint {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(19, 26, 69, .88), rgba(11, 16, 48, .3));
}

.page-about .about-chapter__inner {
  display: block;
}

.page-about .about-chapter__num {
  display: block;
  font-size: 52px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.04em;
  color: rgba(167, 139, 255, .45);
  font-variant-numeric: tabular-nums;
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .page-about .about-chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.4px rgba(167, 139, 255, .7);
  }
}

.page-about .about-chapter__rule {
  display: none;
}

.page-about .about-chapter__body h2 {
  margin: 18px 0 18px;
  max-width: 20em;
  font-size: clamp(25px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.28;
  letter-spacing: -.01em;
  text-shadow: 0 0 20px rgba(123, 77, 255, .35);
}

.page-about .about-chapter__body .prose {
  color: var(--mist);
}

.page-about .about-chapter__aside {
  margin: 26px 0 0;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-chapter__aside a {
  color: var(--neon-soft);
  text-decoration: underline;
  text-decoration-color: rgba(167, 139, 255, .45);
  text-underline-offset: 4px;
  transition: color .2s var(--ease);
}

.page-about .about-chapter__aside a:hover {
  color: var(--cyan);
}

/* ---------- 通栏视觉 ---------- */
.page-about .about-banner {
  margin: 32px 0 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(120deg, rgba(41, 227, 214, .16), rgba(123, 77, 255, .24));
  box-shadow: var(--shadow-card);
}

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

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0 0 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: rgba(123, 77, 255, .65) transparent;
}

.page-about .timeline__item {
  flex: 0 0 min(320px, 76vw);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(165deg, rgba(19, 26, 69, .94), rgba(11, 16, 48, .72));
  box-shadow: var(--shadow-card);
  scroll-snap-align: start;
}

.page-about .timeline__ver {
  margin: 0;
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 18px rgba(41, 227, 214, .5);
}

.page-about .timeline__title {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--star);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .timeline__solved {
  margin: auto 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.6;
  color: var(--neon-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

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

.page-about .team-card {
  position: relative;
  padding: 24px 22px 26px 76px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(19, 26, 69, .92), rgba(11, 16, 48, .62));
  transition: transform .28s var(--ease), border-color .28s var(--ease);
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 77, 255, .6);
}

.page-about .team-card__glyph {
  position: absolute;
  left: 24px;
  top: 26px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--grad);
  opacity: .9;
}

.page-about .team-card__glyph--b {
  border-radius: 10px;
  background: linear-gradient(120deg, var(--cyan), var(--neon-soft));
}

.page-about .team-card__glyph--c {
  border-radius: 50% 50% 50% 6px;
  background: linear-gradient(120deg, var(--coral), var(--neon));
}

.page-about .team-card__count {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--star);
}

.page-about .team-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .team-card a {
  color: var(--neon-soft);
  text-decoration: underline;
  text-decoration-color: rgba(167, 139, 255, .45);
  text-underline-offset: 4px;
}

.page-about .team-card a:hover {
  color: var(--cyan);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(123, 77, 255, .26), rgba(41, 227, 214, .14));
  box-shadow: var(--shadow-card);
}

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

/* ---------- 内容流程 ---------- */
.page-about .accordion {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .accordion__item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(19, 26, 69, .84), rgba(11, 16, 48, .5));
}

.page-about .accordion__head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 20px 22px;
  border: 0;
  background: none;
  font: inherit;
  font-size: 17px;
  font-weight: 700;
  text-align: left;
  color: var(--star);
  cursor: pointer;
  transition: color .2s var(--ease);
}

.page-about .accordion__trigger::before {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(41, 227, 214, .75);
}

.page-about .accordion__trigger[aria-expanded="true"] {
  color: var(--cyan);
}

.page-about .accordion__trigger[aria-expanded="true"]::before {
  background: var(--coral);
  box-shadow: 0 0 12px rgba(255, 107, 87, .75);
}

.page-about .accordion__panel {
  padding: 0 22px 22px 45px;
}

.page-about .accordion__panel p {
  margin: 0;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 城市栏目 ---------- */
.page-about .city-facts {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .city-facts li {
  position: relative;
  padding-left: 26px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--star);
}

.page-about .city-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--cyan);
  opacity: .85;
}

.page-about .city-facts strong {
  font-weight: 700;
  color: var(--cyan);
}

.page-about .city-figure {
  position: relative;
  margin: 32px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: radial-gradient(circle at 30% 40%, rgba(41, 227, 214, .22), transparent 62%), var(--night);
  box-shadow: var(--shadow-card);
}

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

/* ---------- 三条主张 ---------- */
.page-about .belief-grid {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.page-about .belief {
  padding: 28px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(19, 26, 69, .88), rgba(11, 16, 48, .55));
}

.page-about .belief__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  border: 1px solid rgba(41, 227, 214, .5);
  border-radius: 50%;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
}

.page-about .belief h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--star);
}

.page-about .belief p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 合作收尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin-top: 20px;
  padding: 60px 0 76px;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(600px 340px at 84% 16%, rgba(255, 107, 87, .16), transparent 70%),
    radial-gradient(700px 400px at 4% 92%, rgba(123, 77, 255, .3), transparent 72%),
    linear-gradient(180deg, rgba(19, 26, 69, .92), rgba(11, 16, 48, .92));
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-cta__text h2 {
  margin: 14px 0 18px;
  max-width: 18em;
  font-size: clamp(25px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.28;
  text-shadow: 0 0 22px rgba(255, 107, 87, .3);
}

.page-about .about-cta__text p {
  margin: 0 0 12px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-start;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 900px) {
  .page-about .about-top {
    padding: 52px 0 78px;
  }

  .page-about .about-chapter {
    padding: 88px 0;
  }

  .page-about .about-chapter__inner {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr);
    column-gap: 48px;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .about-chapter__num {
    font-size: 64px;
  }

  .page-about .about-chapter__rule {
    display: block;
    width: 1px;
    height: 96px;
    margin-top: 22px;
    background: linear-gradient(180deg, rgba(123, 77, 255, .7), transparent);
  }

  .page-about .about-chapter__body h2 {
    margin-top: 0;
  }

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

@media (min-width: 1080px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    column-gap: 48px;
    align-items: start;
  }

  .page-about .team-figure {
    position: sticky;
    top: 116px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
    column-gap: 48px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-top__glow {
    animation: none;
  }

  .page-about .team-card {
    transition: border-color .2s linear;
  }

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