.page-about {
  --story-rail-w: 150px;
  --story-gap: clamp(1.5rem, 4vw, 3.5rem);
  --story-line: var(--line-600);
  background: var(--ink-950);
  color: var(--text);
  font-family: var(--font-body);
}

/* 首屏 */
.page-about .story-hero {
  position: relative;
  overflow: hidden;
  padding-block: calc(var(--header-h) + 3rem) clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--story-line);
}

.page-about .story-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--story-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--story-line) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.3;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), transparent 82%);
  pointer-events: none;
}

.page-about .story-hero .breadcrumb,
.page-about .story-hero-grid {
  position: relative;
}

.page-about .story-hero-grid {
  display: grid;
  gap: 2.5rem;
  margin-top: clamp(1.75rem, 4vw, 3rem);
}

.page-about .story-title {
  margin: 0.75rem 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.35rem, 7.4vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  color: var(--paper-050);
}

.page-about .story-title strong {
  font-weight: 800;
  color: var(--amber-500);
}

.page-about .story-lead {
  max-width: 58ch;
  margin: 1.75rem 0 0;
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .story-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.page-about .story-plate {
  border: 1px solid var(--story-line);
  border-top: 2px solid var(--amber-500);
  background: linear-gradient(180deg, rgba(16, 47, 78, 0.85), rgba(6, 20, 35, 0.9));
  padding: 1.25rem 1.25rem 0.5rem;
}

.page-about .story-plate-head {
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

.page-about .story-plate-list {
  margin: 0;
}

.page-about .story-plate-row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--story-line);
}

.page-about .story-plate-row dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist-300);
  padding-top: 0.15rem;
}

.page-about .story-plate-row dd {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--paper-050);
}

/* 布局骨架 */
.page-about .story-shell {
  display: grid;
  gap: var(--story-gap);
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(3.5rem, 7vw, 6rem);
}

.page-about .story-rail-title {
  margin: 0 0 0.6rem;
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--mist-300);
}

.page-about .story-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .story-rail-list::-webkit-scrollbar {
  display: none;
}

.page-about .story-rail-link {
  display: block;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--story-line);
  font-size: 0.8125rem;
  color: var(--mist-300);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .story-rail-link:hover,
.page-about .story-rail-link:focus-visible {
  color: var(--paper-050);
  border-bottom-color: var(--amber-500);
  outline: none;
}

.page-about .story-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(2.5rem, 5vw, 4.5rem);
}

/* 章节通用 */
.page-about .story-section {
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
  border-top: 1px solid var(--story-line);
  padding-top: clamp(1.75rem, 3.5vw, 2.75rem);
}

.page-about .story-section > h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(1.7rem, 3.6vw, 2.85rem);
  line-height: 1.15;
  color: var(--paper-050);
}

.page-about .story-section > h2 strong {
  font-weight: 800;
}

.page-about .story-section > p {
  max-width: 64ch;
  margin: 1.1rem 0 0;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .pull-quote {
  margin: 1.75rem 0 0;
  padding: 0.9rem 0 0.9rem 1.25rem;
  border-left: 2px solid var(--amber-500);
  max-width: 34ch;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(1.15rem, 2.4vw, 1.55rem);
  line-height: 1.45;
  color: var(--paper-050);
}

/* 图 */
.page-about .story-media {
  margin: clamp(1.75rem, 3.5vw, 2.5rem) 0 0;
}

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

.page-about .media-caption {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--mist-300);
}

/* 时间线 */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(1.75rem, 3.5vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 1.5rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 1.1rem;
  bottom: -1.5rem;
  width: 1px;
  background: var(--story-line);
}

.page-about .timeline-item:last-child::before {
  display: none;
}

.page-about .timeline-dot {
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 9px;
  height: 9px;
  background: var(--ink-950);
  border: 1px solid var(--amber-500);
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .timeline-item:hover .timeline-dot,
.page-about .timeline-item:focus-within .timeline-dot {
  background: var(--amber-500);
  transform: rotate(45deg) scale(1.15);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

.page-about .timeline-title {
  margin: 0.35rem 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--paper-050);
}

.page-about .timeline-text {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 0.5rem;
}

.page-about .team-copy p {
  max-width: 62ch;
  margin: 1.1rem 0 0;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .story-media--side {
  margin-top: 0;
}

.page-about .role-list {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
}

.page-about .role-card {
  border: 1px solid var(--story-line);
  border-left: 2px solid var(--cyan-400);
  background: linear-gradient(180deg, rgba(16, 47, 78, 0.65), rgba(10, 33, 56, 0.25));
  padding: 1.15rem 1.15rem 1.25rem;
}

.page-about .role-no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  color: var(--mist-300);
}

.page-about .role-card h3 {
  margin: 0.55rem 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--paper-050);
}

.page-about .role-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-dim);
}

/* 规模数据 */
.page-about .stat-grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
}

.page-about .stat-card {
  border: 1px solid var(--story-line);
  background: var(--ink-900);
  padding: 1.35rem 1.15rem 1.4rem;
}

.page-about .stat-card--accent {
  border-left: 2px solid var(--amber-500);
  background: linear-gradient(150deg, rgba(16, 47, 78, 0.9), rgba(10, 33, 56, 0.6));
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5.5vw, 3.4rem);
  line-height: 1;
  color: var(--paper-050);
  letter-spacing: -0.01em;
}

.page-about .stat-num em {
  font-style: normal;
  font-size: 0.4em;
  font-weight: 400;
  margin-left: 0.2em;
  color: var(--mist-300);
}

.page-about .stat-label {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.8438rem;
  line-height: 1.65;
  color: var(--mist-300);
}

.page-about .story-note {
  max-width: 64ch;
  margin: 1.5rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--story-line);
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* 合作与认可 */
.page-about .credit-list {
  margin-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--story-line);
}

.page-about .credit-row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--story-line);
}

.page-about .credit-k {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  color: var(--mist-300);
  padding-top: 0.3rem;
}

.page-about .credit-v {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--paper-050);
}

.page-about .credit-v .tag {
  margin: 0 0.4rem 0.4rem 0;
}

/* 下一步 */
.page-about .path-grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.75rem, 3.5vw, 2.5rem);
}

.page-about .path-card {
  display: block;
  border: 1px solid var(--story-line);
  background: var(--ink-900);
  padding: 1.5rem 1.25rem;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .path-card:hover,
.page-about .path-card:focus-visible {
  border-color: var(--amber-500);
  background: var(--ink-800);
  transform: translateY(-3px);
  outline: none;
}

.page-about .path-card .mono {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  color: var(--cyan-400);
}

.page-about .path-card h3 {
  margin: 0.6rem 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--paper-050);
}

.page-about .path-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .story-tail {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  margin-top: clamp(2rem, 4vw, 2.75rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--story-line);
}

.page-about .story-tail p {
  max-width: 56ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist-300);
}

/* 响应式 */
@media (min-width: 720px) {
  .page-about .story-hero-grid {
    grid-template-columns: minmax(0, 1fr) 290px;
    align-items: end;
  }

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

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

  .page-about .story-tail {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .story-shell {
    grid-template-columns: var(--story-rail-w) minmax(0, 1fr);
  }

  .page-about .story-rail {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    align-self: start;
  }

  .page-about .story-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .story-rail-link {
    border-bottom: 0;
    border-left: 1px solid var(--story-line);
    padding: 0.5rem 0.75rem;
  }

  .page-about .story-rail-link:hover,
  .page-about .story-rail-link:focus-visible {
    border-left-color: var(--amber-500);
    border-bottom-color: transparent;
    background: rgba(16, 47, 78, 0.55);
  }

  .page-about .story-flow {
    max-width: 900px;
  }

  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 1.25rem;
    gap: 0;
  }

  .page-about .timeline-item {
    padding-left: 0;
    padding-top: 1.75rem;
    padding-right: 0.5rem;
  }

  .page-about .timeline-item::before {
    left: 0;
    right: 0;
    top: 4px;
    bottom: auto;
    width: 100%;
    height: 1px;
  }

  .page-about .timeline-item:last-child::before {
    display: block;
  }

  .page-about .timeline-dot {
    left: 0;
    top: 0;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 2.5rem;
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .stat-card:nth-child(1) {
    grid-column: 1 / 8;
  }

  .page-about .stat-card:nth-child(2) {
    grid-column: 9 / 13;
    margin-top: 2.5rem;
  }

  .page-about .stat-card:nth-child(3) {
    grid-column: 2 / 6;
    margin-top: 1rem;
  }

  .page-about .stat-card:nth-child(4) {
    grid-column: 7 / 13;
    margin-top: 3.25rem;
  }

  .page-about .credit-row {
    grid-template-columns: 6rem minmax(0, 1fr);
  }
}

@media (min-width: 1180px) {
  .page-about .story-hero-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .page-about .story-title {
    line-height: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline-dot,
  .page-about .path-card,
  .page-about .story-rail-link {
    transition: none;
  }

  .page-about .path-card:hover,
  .page-about .path-card:focus-visible,
  .page-about .timeline-item:hover .timeline-dot {
    transform: none;
  }
}