.page-about {
  --about-rail-w: 208px;
  --about-gap-x: clamp(32px, 5vw, 84px);
  --about-section-gap: clamp(52px, 7vw, 96px);
  position: relative;
  overflow-x: clip;
  padding-bottom: clamp(56px, 9vw, 110px);
  background:
    radial-gradient(900px 520px at 8% -6%, rgba(0, 229, 255, 0.10), transparent 62%),
    radial-gradient(760px 520px at 96% 8%, rgba(59, 30, 110, 0.42), transparent 66%);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-wrap {
  padding-top: clamp(20px, 3vw, 36px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  margin: clamp(22px, 4vw, 44px) 0 clamp(38px, 6vw, 72px);
  max-width: 920px;
}

.page-about .about-hero__eyebrow {
  color: var(--neon);
  margin: 0 0 18px;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(32px, 5.4vw, 60px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-shadow: 0 0 26px rgba(0, 229, 255, 0.18);
}

.page-about .about-hero__lede {
  margin: 0 0 36px;
  max-width: 34em;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
  margin: 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-stats__num {
  display: block;
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--white);
  text-shadow: 0 0 22px rgba(0, 229, 255, 0.22);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 主骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__caption {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 2px 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--white);
  border-color: rgba(0, 229, 255, 0.55);
  background: rgba(0, 229, 255, 0.08);
}

.page-about .about-rail__num {
  font-size: 12px;
  color: var(--neon);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding-top: var(--about-section-gap);
  border-top: 1px solid var(--line);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 1px;
  background: linear-gradient(90deg, var(--neon), transparent);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.65);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section:first-child::before {
  display: none;
}

.page-about .about-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 22px;
}

.page-about .about-section__num {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--neon);
}

.page-about .about-section__title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(23px, 3vw, 33px);
  line-height: 1.3;
  font-weight: 800;
}

.page-about .about-section__year {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-lead {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.85;
  color: var(--white);
}

.page-about .about-text {
  margin: 0 0 1.2em;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 图文两栏 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, rgba(0, 229, 255, 0.10), transparent 55%),
    var(--card);
}

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

.page-about .about-figure--wide {
  margin: 26px 0 0;
}

.page-about .about-figure--panorama {
  margin: 26px 0 0;
}

.page-about .about-figure--panorama img {
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-figure__caption {
  padding: 12px 16px 14px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.85);
}

.page-about .about-timeline__mark {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 分类索引表 ---------- */
.page-about .about-taxa {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 24px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.page-about .about-taxa__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  font-size: 15px;
  color: var(--white);
  background: var(--card);
  transition: background-color 0.18s var(--ease);
}

.page-about .about-taxa__item:hover {
  background: var(--blue-step);
}

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

/* ---------- 团队卡片 ---------- */
.page-about .about-crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 28px 0 24px;
}

.page-about .about-crew__card {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-crew__card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 255, 0.4);
}

.page-about .about-crew__card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-crew__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 四代视觉 ---------- */
.page-about .about-palette {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 26px 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-palette__item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-palette__item:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 255, 0.45);
}

.page-about .about-palette__chip {
  display: block;
  height: 60px;
  margin-bottom: 14px;
  border-radius: 8px;
}

.page-about .about-palette__item:nth-child(1) .about-palette__chip {
  background: linear-gradient(140deg, var(--brand-blue), var(--blue-step));
}

.page-about .about-palette__item:nth-child(2) .about-palette__chip {
  background: linear-gradient(140deg, var(--blue-step), var(--ink-void));
}

.page-about .about-palette__item:nth-child(3) .about-palette__chip {
  background: linear-gradient(140deg, var(--purple), var(--brand-blue));
}

.page-about .about-palette__item:nth-child(4) .about-palette__chip {
  background: linear-gradient(140deg, var(--neon), var(--gold) 58%, var(--purple));
}

.page-about .about-palette__gen {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .about-palette__name {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-palette__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-quote {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 32px 0 0;
  padding: 8px 0 8px 22px;
  border-left: 2px solid var(--neon);
  box-shadow: -1px 0 18px -6px rgba(0, 229, 255, 0.6);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 30em;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.7;
  color: var(--white);
}

.page-about .about-quote__note {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 26px 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__item {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-partners__num {
  display: block;
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-partners__title {
  margin: 10px 0 8px;
  font-size: 16px;
  color: var(--white);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 折叠组 ---------- */
.page-about .about-section .accordion {
  margin-top: 26px;
}

/* ---------- 收尾导航 ---------- */
.page-about .about-outro {
  margin-top: var(--about-section-gap);
  padding: clamp(26px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(59, 30, 110, 0.55), rgba(10, 42, 107, 0.35) 55%, rgba(5, 11, 26, 0.9));
}

.page-about .about-outro h2 {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 800;
}

.page-about .about-outro p {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-crew,
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
    row-gap: 26px;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-top: 34px;
  }

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

@media (min-width: 900px) {
  .page-about .about-grid--media {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    grid-template-areas: "stream rail";
    gap: var(--about-gap-x);
    align-items: start;
  }

  .page-about .about-stream {
    grid-area: stream;
  }

  .page-about .about-rail {
    grid-area: rail;
    position: sticky;
    top: calc(var(--bar-h-stuck) + 28px);
    max-height: calc(100vh - var(--bar-h-stuck) - 48px);
    overflow-y: auto;
    padding: 4px 0 4px 20px;
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    position: relative;
    width: 100%;
    padding: 7px 0 7px 10px;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 2px;
    height: 0;
    background: var(--neon);
    transform: translateY(-50%);
    transition: height 0.18s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    border-color: transparent;
    color: var(--white);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    height: 70%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}