.page-about {
  --about-body-max: 66ch;
  --about-stripe: repeating-linear-gradient(
    90deg,
    rgba(18, 54, 46, 0.85) 0 26px,
    rgba(10, 20, 32, 0.95) 26px 52px
  );
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  padding-block: clamp(1.5rem, 4vw, 3rem) clamp(2rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-mast__kicker {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--neon);
  margin: 0 0 clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-mast__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.5rem, 9vw, 6.5rem);
  line-height: 0.94;
  letter-spacing: -0.015em;
  color: var(--paper);
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-mast__lede {
  max-width: 58ch;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 clamp(2rem, 5vw, 3rem);
}

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

.page-about .about-mast__facts li {
  background: var(--ink-deep);
  padding: clamp(0.85rem, 2vw, 1.25rem);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.page-about .about-mast__num {
  font-family: var(--font-data);
  font-size: clamp(1.35rem, 4vw, 2rem);
  font-variant-numeric: tabular-nums;
  color: var(--neon);
  line-height: 1;
}

.page-about .about-mast__cap {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 首屏主图 ---------- */
.page-about .about-hero {
  margin: clamp(1.5rem, 4vw, 2.5rem) auto;
  aspect-ratio: 3 / 2;
}

/* ---------- 布局骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 3.5rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 目录 ---------- */
.page-about .about-toc {
  min-width: 0;
  border-top: 2px solid var(--neon);
  padding-top: 1rem;
}

.page-about .about-toc__head {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 0.85rem;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  font-size: 0.85rem;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--neon);
  color: var(--signal);
  background: var(--neon-soft);
}

.page-about .about-toc__num {
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--neon);
}

/* ---------- 正文容器 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 5rem;
}

.page-about .about-section + .about-section {
  position: relative;
  padding-top: clamp(2.5rem, 7vw, 4.5rem);
}

.page-about .about-section + .about-section::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 12px;
  background: var(--about-stripe);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  opacity: 0.75;
}

.page-about .about-body .section__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-body .prose {
  max-width: var(--about-body-max);
}

.page-about .about-body .prose p {
  margin: 0 0 1.15rem;
}

.page-about .about-body .prose a {
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--neon);
}

.page-about .about-body .prose a:hover {
  color: var(--neon);
}

/* ---------- 02 流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 2.75rem);
  align-items: start;
}

.page-about .about-flow__media {
  margin: 0;
  aspect-ratio: 10 / 7;
  border: 1px solid var(--line);
}

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

.page-about .about-flow__item {
  position: relative;
  padding: 0 0 1.5rem 1.4rem;
}

.page-about .about-flow__item:last-child {
  padding-bottom: 0;
}

.page-about .about-flow__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.6rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--neon);
}

.page-about .about-flow__tag {
  display: inline-block;
  margin-bottom: 0.5rem;
}

.page-about .about-flow__title {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  font-weight: 600;
  color: var(--paper);
  margin: 0 0 0.4rem;
}

.page-about .about-flow__item p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 03 归档 ---------- */
.page-about .about-archive {
  align-items: start;
}

.page-about .about-archive__media {
  margin: 0;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line);
}

/* ---------- 04 团队数据 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.5rem) 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);
}

.page-about .about-stats .stat {
  background: var(--panel);
  padding: clamp(0.9rem, 2.2vw, 1.35rem);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}

.page-about .about-stats .stat__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  color: var(--neon);
  line-height: 1.1;
  order: -1;
}

.page-about .about-stats .stat__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 05 延伸入口 ---------- */
.page-about .about-next {
  margin-top: clamp(1.75rem, 4.5vw, 2.75rem);
  padding: clamp(1.25rem, 3vw, 1.85rem);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
}

.page-about .about-next__lead {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 1rem;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-next__list a {
  display: inline-block;
  color: var(--paper);
  text-decoration: none;
  font-size: 0.95rem;
  padding-left: 1.15rem;
  position: relative;
  transition: color 0.2s var(--ease);
}

.page-about .about-next__list a::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--neon);
  transition: transform 0.2s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--signal);
}

.page-about .about-next__list a:hover::before {
  transform: translateX(3px);
}

/* ---------- 返回顶部 ---------- */
.page-about .to-top {
  margin-bottom: clamp(2rem, 6vw, 4rem);
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  color: var(--neon);
  border-color: var(--neon);
}

/* ---------- 小屏细节 ---------- */
@media (max-width: 479px) {
  .page-about .about-mast__facts {
    grid-template-columns: minmax(0, 1fr);
  }

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  }
}

/* ---------- 桌面：目录贴边固定 ---------- */
@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(3rem, 6vw, 5.5rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 2.5rem;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
  }

  .page-about .about-toc__list li + li {
    border-top: 1px solid var(--line-soft);
  }

  .page-about .about-toc__list a {
    border: none;
    border-left: 2px solid transparent;
    padding: 0.7rem 0.25rem 0.7rem 0.75rem;
    white-space: normal;
    width: 100%;
    transition: border-color 0.25s var(--ease), color 0.25s var(--ease), background-color 0.25s var(--ease);
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-left-color: var(--neon);
    background: var(--neon-soft);
  }

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

  .page-about .about-flow__list {
    padding-left: 0.5rem;
  }

  .page-about .about-archive {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

/* ---------- 宽屏：正文栏收窄 ---------- */
@media (min-width: 1200px) {
  .page-about .about-shell {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .page-about .about-flow {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .about-next__list a,
  .page-about .about-next__list a::before,
  .page-about .to-top {
    transition: none;
  }
}