.page-about {
  background: var(--ink);
  color: var(--paper);
}

.page-about .breadcrumbs {
  padding: 18px 0 0;
}

/* ── 首屏 ── */
.page-about .about-hero {
  padding: 18px 0 40px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 26px;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(2.15rem, 7.2vw, 4rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: 0.98rem;
  line-height: 1.72;
  color: var(--paper-dim);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 24px 0 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
  border-top: 1px dashed var(--line);
}

.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ice);
}

.page-about .about-hero__key {
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__figure {
  margin: 0;
  padding: 7px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.86);
}

.page-about .about-hero__figure figcaption {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.76rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ── 章节跳转条 ── */
.page-about .about-jump {
  padding: 0 0 6px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-jump__list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

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

.page-about .about-jump__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 13px;
  font-size: 0.82rem;
  color: var(--paper-dim);
  text-decoration: none;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.page-about .about-jump__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--lime-deep);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  border-color: var(--line-strong);
  color: var(--lime);
  transform: translateY(-1px);
  outline: none;
}

/* ── 章节骨架：左窄右宽 ── */
.page-about .about-chapter {
  padding: 34px 0 12px;
}

.page-about .about-chapter__inner {
  display: grid;
  gap: 16px;
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 0.9;
  color: var(--lime-deep);
}

.page-about .about-chapter__tag {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  padding-left: 9px;
  border-left: 2px solid var(--lime);
}

.page-about .about-chapter__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(1.42rem, 4.4vw, 2.05rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-chapter__body > p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 0.94rem;
  line-height: 1.74;
  color: var(--paper-dim);
}

.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--paper);
  border-color: var(--lime);
  outline: none;
}

.page-about .about-chapter__rule {
  display: block;
  height: 1px;
  margin-top: 22px;
  background: linear-gradient(90deg, var(--line-strong), rgba(201, 255, 61, 0) 72%);
}

/* ── 团队名册 ── */
.page-about .roster {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .roster__item {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 3px 14px;
  padding: 16px 16px 16px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
  transition: border-color 160ms ease, transform 160ms ease;
}

.page-about .roster__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--lime);
}

.page-about .roster__item:nth-child(2)::before {
  background: var(--orange);
}

.page-about .roster__item:nth-child(3)::before {
  background: var(--ice);
}

.page-about .roster__item:hover,
.page-about .roster__item:focus-within {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .roster__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .roster__name {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .roster__desc {
  grid-column: 2;
  margin: 5px 0 0;
  font-size: 0.86rem;
  line-height: 1.66;
  color: var(--mist);
}

/* ── 流程时间轴 ── */
.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.page-about .flow {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(201, 255, 61, 0.08) 100%);
}

.page-about .flow__item {
  position: relative;
  margin-bottom: 10px;
}

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

.page-about .flow__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--ink);
  border: 1px solid var(--lime);
  transform: rotate(45deg);
}

.page-about .flow__node > summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px 12px;
  padding: 12px 14px;
  cursor: pointer;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.page-about .flow__node > summary::-webkit-details-marker {
  display: none;
}

.page-about .flow__node > summary::marker {
  content: "";
}

.page-about .flow__node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--lime);
}

.page-about .flow__node[open] > summary::after {
  content: "−";
}

.page-about .flow__node > summary:hover,
.page-about .flow__node > summary:focus-visible,
.page-about .flow__node[open] > summary {
  border-color: var(--line-strong);
  background: var(--ink-3);
  transform: translateY(-1px);
  outline: none;
}

.page-about .flow__time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--orange);
}

.page-about .flow__name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .flow__desc {
  margin: 0;
  padding: 12px 14px 14px;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--paper-dim);
  background: rgba(20, 58, 43, 0.5);
  border: 1px solid var(--line-soft);
  border-top: none;
}

/* ── 图片 ── */
.page-about .about-figure {
  margin: 18px 0 0;
  padding: 7px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.88);
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.76rem;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-figure--square {
  margin-top: 0;
}

/* ── 版本轨道 ── */
.page-about .version-track {
  margin-top: 18px;
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .version-track__item {
  display: grid;
  gap: 3px;
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
  background: var(--ink-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-stack);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.page-about .version-track__item:hover,
.page-about .version-track__item:focus-visible {
  border-color: var(--line-strong);
  background: var(--ink-3);
  transform: translateY(-2px);
  outline: none;
}

.page-about .version-track__num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ice);
}

.page-about .version-track__label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .version-track__desc {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ── 收尾行动区 ── */
.page-about .about-cta {
  margin-top: 36px;
  padding: 34px 0 52px;
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 10px 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(1.42rem, 4.6vw, 2.05rem);
  font-weight: 700;
  line-height: 1.18;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 54ch;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ── 响应式 ── */
@media (min-width: 620px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 26px 0 54px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 46px;
  }

  .page-about .about-chapter {
    padding: 46px 0 16px;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 36px;
  }

  .page-about .about-chapter__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }

  .page-about .about-chapter__num {
    font-size: 3rem;
  }

  .page-about .about-chapter__tag {
    border-left: none;
    padding-left: 0;
    padding-top: 8px;
    border-top: 1px solid var(--line-strong);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
    gap: 28px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-jump__link,
  .page-about .roster__item,
  .page-about .flow__node > summary,
  .page-about .version-track__item {
    transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
  }

  .page-about .about-jump__link:hover,
  .page-about .about-jump__link:focus-visible,
  .page-about .roster__item:hover,
  .page-about .roster__item:focus-within,
  .page-about .flow__node > summary:hover,
  .page-about .flow__node > summary:focus-visible,
  .page-about .flow__node[open] > summary,
  .page-about .version-track__item:hover,
  .page-about .version-track__item:focus-visible {
    transform: none;
  }
}
<<<END>>>