.page-about {
  position: relative;
  background: var(--void);
  color: var(--white);
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow-x: hidden;
}

.page-about .about-crumb-sep {
  margin: 0 .5em;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(88px, 12vw, 132px);
  padding-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 44px);
  align-items: start;
  margin-top: clamp(20px, 3.5vw, 36px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.14;
  margin: .34em 0 .62em;
  max-width: 18ch;
  background: linear-gradient(102deg, var(--white) 32%, #C6B6FF 74%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lede {
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--muted);
  max-width: var(--measure);
  margin: 0;
}

.page-about .about-hero__lede strong,
.page-about .about-copy strong {
  color: var(--white);
  font-weight: 600;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  outline: 1px solid rgba(124, 59, 255, .46);
  outline-offset: 9px;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.08) contrast(1.06);
}

/* ---------- 数据条 ---------- */
.page-about .about-stripe {
  margin: clamp(44px, 7vw, 84px) 0;
  border-top: var(--edge);
  border-bottom: var(--edge);
  background:
    linear-gradient(90deg, rgba(124, 59, 255, .18), rgba(43, 217, 255, .07) 52%, transparent 88%);
}

.page-about .about-stripe__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: clamp(20px, 3.6vw, 34px) 0;
  list-style: none;
}

.page-about .about-stripe__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 4px;
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.page-about .about-stripe__num {
  font-size: var(--fs-lg);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stripe__label {
  font-size: var(--fs-xs);
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter {
  padding: clamp(46px, 7.5vw, 88px) 0;
}

.page-about .about-chapter__inner {
  position: relative;
}

.page-about .about-chapter__inner h2 {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 800;
  letter-spacing: -.014em;
  line-height: 1.22;
  margin: .3em 0 0;
  max-width: 22ch;
}

.page-about .about-copy {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-copy p {
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 1.15em;
}

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

/* 左侧电流轴 + 节点 */
.page-about .about-mark {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-chapter--shift .about-chapter__inner {
    padding-left: clamp(24px, 4vw, 56px);
  }

  .page-about .about-chapter__inner::before {
    content: "";
    position: absolute;
    left: -36px;
    top: 8px;
    bottom: -8px;
    width: 1px;
    background: var(--line);
    transition: background .6s ease, box-shadow .6s ease;
  }

  .page-about .about-chapter__inner.is-visible::before {
    background: linear-gradient(180deg, var(--violet), var(--cyan) 62%, var(--line));
    box-shadow: var(--glow-cyan);
  }

  .page-about .about-mark {
    display: block;
    position: absolute;
    left: -40px;
    top: 10px;
    width: 9px;
    height: 9px;
    background: var(--panel);
    border: 1px solid var(--line);
    transform: rotate(45deg);
    transition: background .5s ease, border-color .5s ease, box-shadow .5s ease;
  }

  .page-about .about-chapter__inner.is-visible .about-mark {
    background: var(--lime);
    border-color: var(--lime);
    box-shadow: 0 0 14px -2px rgba(200, 255, 61, .95);
  }
}

/* ---------- 里程碑时间线 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-track--continued {
  margin-top: clamp(22px, 3.4vw, 34px);
}

.page-about .about-node-card {
  background: var(--panel);
  border: var(--edge);
  border-left: 3px solid var(--line);
  transition: border-color .3s ease, background .3s ease;
}

.page-about .about-node-card[open] {
  border-left-color: var(--violet);
  background: var(--layer);
}

.page-about .about-node-card--now {
  border-left-color: var(--lime);
  box-shadow: var(--glow-violet);
}

.page-about .about-node-card__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node-card__head::-webkit-details-marker {
  display: none;
}

.page-about .about-node-card__head::marker {
  content: "";
}

.page-about .about-node-card__title {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--white);
  line-height: 1.4;
}

.page-about .about-node-card__hint {
  grid-column: 2;
  font-size: var(--fs-xs);
  color: var(--muted);
  letter-spacing: .04em;
  transition: color .25s ease;
}

.page-about .about-node-card__head:hover .about-node-card__hint,
.page-about .about-node-card[open] .about-node-card__hint {
  color: var(--cyan);
}

.page-about .about-node-card__body {
  padding: 2px 18px 18px;
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  margin: 0 18px 0;
  padding-left: 0;
  padding-right: 0;
}

.page-about .about-node-card__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-figure {
  margin: clamp(20px, 3vw, 30px) 0 0;
  aspect-ratio: 5 / 3;
  position: relative;
}

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

/* ---------- 中段拉页数据 ---------- */
.page-about .about-pull {
  margin: clamp(16px, 3vw, 28px) 0;
  padding: clamp(34px, 5.5vw, 62px) 0;
  background:
    linear-gradient(115deg, rgba(124, 59, 255, .22) 0%, rgba(43, 217, 255, .09) 46%, rgba(7, 7, 12, 0) 78%),
    var(--panel);
  border-top: 1px solid rgba(124, 59, 255, .34);
  border-bottom: 1px solid rgba(43, 217, 255, .26);
}

.page-about .about-pull__inner {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
}

.page-about .about-pull__lead {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-pull__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-pull__stats li {
  display: grid;
  grid-template-columns: auto auto;
  justify-content: start;
  align-items: baseline;
  gap: 6px 10px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(200, 255, 61, .34);
}

.page-about .about-pull__num {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--white);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-pull__unit {
  font-size: var(--fs-xs);
  color: var(--lime);
  letter-spacing: .05em;
}

.page-about .about-pull__desc {
  grid-column: 1 / -1;
  font-size: var(--fs-xs);
  color: var(--muted);
}

/* ---------- 导航归组 ---------- */
.page-about .about-groups {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--edge);
}

.page-about .about-groups__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  align-items: baseline;
  background: var(--panel);
  padding: 16px 18px;
}

.page-about .about-groups__key {
  font-size: var(--fs-xs);
  color: var(--cyan);
  letter-spacing: .1em;
}

.page-about .about-groups__name {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--white);
}

.page-about .about-groups__note {
  grid-column: 2;
  font-size: var(--fs-xs);
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-team__text {
  margin-top: 0;
}

.page-about .about-team__link {
  margin-top: 18px;
}

.page-about .about-team__media {
  position: relative;
  margin: 0;
  aspect-ratio: 3 / 2;
  border: var(--edge);
}

.page-about .about-team__media::after {
  content: "";
  position: absolute;
  inset: auto -10px -10px auto;
  width: 46%;
  height: 34%;
  border-right: 2px solid var(--violet);
  border-bottom: 2px solid var(--cyan);
  pointer-events: none;
}

/* ---------- 场景筛选 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-scene {
  padding: clamp(20px, 3vw, 28px);
  border-left: 3px solid var(--violet);
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--muted);
  max-width: var(--measure);
}

.page-about .about-scene__meta {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-xs);
  color: var(--cyan);
  letter-spacing: .02em;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 34px);
  background: var(--line);
  border: var(--edge);
}

.page-about .about-next__item {
  background: var(--panel);
  padding: clamp(20px, 3vw, 28px);
}

.page-about .about-next__idx {
  display: inline-block;
  font-size: var(--fs-xs);
  color: var(--lime);
  letter-spacing: .14em;
  margin-bottom: 10px;
}

.page-about .about-next__title {
  margin: 0 0 8px;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--white);
}

.page-about .about-next__text {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--muted);
  max-width: var(--measure);
}

/* ---------- 收尾 CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 52px);
  padding: clamp(22px, 3.6vw, 34px);
  border: var(--edge);
  border-top: 3px solid var(--violet);
  background:
    linear-gradient(150deg, rgba(124, 59, 255, .16), rgba(43, 217, 255, .05) 58%, transparent),
    var(--panel);
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--white);
  max-width: var(--measure);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 68px);
  }

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

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

  .page-about .about-chapter--shift .about-chapter__inner {
    max-width: 880px;
    margin-left: auto;
  }

  .page-about .about-pull__inner {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: center;
    gap: clamp(28px, 5vw, 64px);
  }

  .page-about .about-pull__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

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

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 1200px) {
  .page-about .about-chapter__inner {
    max-width: 74ch;
  }

  .page-about .about-chapter--shift .about-chapter__inner {
    max-width: 860px;
  }
}

/* ---------- 动效克制 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter__inner::before,
  .page-about .about-mark,
  .page-about .about-node-card,
  .page-about .about-node-card__hint {
    transition: none;
  }
}