.page-about {
  display: block;
  padding-bottom: 4.5rem;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding-top: 1.25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 2rem;
  padding-top: 1.5rem;
  padding-bottom: 1rem;
}

.page-about .about-hero__intro {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 42rem;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--mist-dim);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.5rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts > div {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 4vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--mist-faint);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(120% 92% at 84% 10%, rgba(47, 243, 208, 0.16), transparent 62%);
}

/* ---------- 正文两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.75rem;
  padding-top: 2rem;
}

/* ---------- 章节轨道 ---------- */
.page-about .about-toc .nav-caption {
  margin: 0 0 0.6rem;
}

.page-about .about-toc ul {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.35rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc a {
  display: block;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass-soft);
  color: var(--mist-dim);
  font-size: 0.8125rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--cyan);
  border-color: var(--teal);
}

.page-about .about-toc a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
}

.page-about .about-section {
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.page-about .about-section + .about-section {
  margin-top: 2.25rem;
}

.page-about .about-flow p {
  max-width: 46rem;
  margin: 0 0 1.05rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist-dim);
}

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

.page-about .about-flow strong {
  color: var(--mist);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, 0.4);
}

.page-about .about-flow a:hover,
.page-about .about-flow a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-flow .about-note p,
.page-about .about-flow .about-cta p {
  margin: 0;
}

/* ---------- 玻璃提示 ---------- */
.page-about .about-note {
  max-width: 46rem;
  margin-top: 1.5rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid rgba(47, 243, 208, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(47, 243, 208, 0.09), rgba(29, 46, 42, 0.55));
}

.page-about .about-note p {
  max-width: none;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 1.6rem 0 0;
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 0.85rem;
  margin: 1.75rem 0 0;
  padding: 0 0 1rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-timeline__item {
  flex: 0 0 min(78vw, 258px);
  scroll-snap-align: start;
  display: grid;
  gap: 0.55rem;
  align-content: start;
  padding: 1.1rem 1.15rem 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.page-about .about-timeline__stage {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist-faint);
}

.page-about .about-timeline__stage::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 243, 208, 0.14);
}

.page-about .about-timeline__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-flow .about-timeline__desc {
  max-width: none;
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--mist-dim);
}

/* ---------- 角色网格 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 1.5rem;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: 1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--glass-soft);
}

.page-about .about-roles--system .about-role {
  border-left: 2px solid var(--teal);
}

.page-about .about-role__name {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--mist);
}

.page-about .about-role__desc {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist-dim);
}

/* ---------- 生态数据 ---------- */
.page-about .about-eco-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.9rem;
  margin: 1.5rem 0;
  padding: 1.2rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: 1.75rem 0 0;
  padding: 1.35rem 1.25rem 1.35rem 1.4rem;
  border-left: 3px solid var(--moss);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(120deg, rgba(111, 143, 106, 0.16), rgba(11, 31, 26, 0.7));
}

.page-about .about-quote blockquote {
  margin: 0;
}

.page-about .about-flow .about-quote p {
  max-width: none;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-more {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.page-about .about-more summary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

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

.page-about .about-more summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1;
}

.page-about .about-more[open] summary::before {
  content: "–";
}

.page-about .about-more__body {
  margin-top: 0.85rem;
  max-width: 44rem;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mist-dim);
}

.page-about .about-flow .about-more__body p {
  max-width: none;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--mist-dim);
}

/* ---------- 地域模块 ---------- */
.page-about .about-base-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.page-about .about-base-card {
  display: grid;
  gap: 0.4rem;
  align-content: start;
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.page-about .about-base-card--moss {
  border-color: rgba(111, 143, 106, 0.42);
  background: linear-gradient(142deg, rgba(111, 143, 106, 0.22), rgba(11, 31, 26, 0.9));
}

.page-about .about-base-card__title {
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-base-card__desc {
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--mist-dim);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1rem;
  margin-top: 2.25rem;
  padding: 1.4rem 1.35rem;
  border: 1px solid rgba(47, 243, 208, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(47, 243, 208, 0.1), rgba(29, 46, 42, 0.6));
}

.page-about .about-cta__text {
  display: block;
  max-width: 40rem;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta .btn {
  justify-self: start;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 2rem;
    padding-bottom: 1.5rem;
  }

  .page-about .about-facts {
    gap: 1.25rem;
  }

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

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 1.6rem 1.6rem;
  }

  .page-about .about-cta .btn {
    justify-self: end;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3rem;
    align-items: center;
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 3.5rem;
    padding-top: 3rem;
  }

  .page-about .about-toc {
    position: sticky;
    top: 2rem;
    align-self: start;
  }

  .page-about .about-toc ul {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-toc li {
    display: block;
  }

  .page-about .about-toc a {
    padding: 0.5rem 0 0.5rem 0.95rem;
    margin-left: -1px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: 0.875rem;
    white-space: normal;
  }

  .page-about .about-toc a[aria-current="true"] {
    color: var(--cyan);
    background: linear-gradient(90deg, rgba(47, 243, 208, 0.16), transparent 88%);
    border-left-color: var(--cyan);
  }

  .page-about .about-section {
    padding-top: 2.5rem;
  }

  .page-about .about-section + .about-section {
    margin-top: 3rem;
  }

  .page-about .about-timeline__item {
    flex: 0 0 262px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 4.5rem;
  }

  .page-about .about-timeline__item {
    flex: 0 0 280px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc a {
    transition: none;
  }

  .page-about .about-timeline {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }
}
<<<END>>>