.page-about {
  /* 页面专属变量 */
  --about-decor-height: 60px;
  --about-timeline-color: var(--c-gold);
  --about-card-bg: var(--c-dark-alt);
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--c-text-dim);
  margin-bottom: var(--space-md);
}

.page-about .breadcrumbs a {
  color: var(--c-gold);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumbs a:hover {
  color: var(--c-gold-light);
}

.page-about .breadcrumbs .separator {
  margin: 0 0.25rem;
  color: var(--c-text-dim);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--c-text);
  font-weight: 600;
}

/* 品牌宣言区 */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.page-about .about-manifesto {
  text-align: center;
}

.page-about .about-manifesto h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-gold);
  margin: 0 0 var(--space-sm);
  text-shadow: 0 0 8px rgba(218,165,32,0.3);
}

.page-about .about-manifesto .tagline {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-gold-light);
  letter-spacing: 0.05em;
  margin: 0 0 var(--space-sm);
  position: relative;
  display: inline-block;
}

.page-about .about-manifesto .tagline::after {
  content: '';
  display: block;
  width: 80%;
  height: 2px;
  background: var(--gradient-red-gold);
  margin: var(--space-xs) auto 0;
}

.page-about .about-manifesto .hero-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-text);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

.page-about .about-hero-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--c-glow);
  object-fit: cover;
}

/* 通用章节样式 */
.page-about section[data-reveal] {
  margin-bottom: var(--space-xl);
}

.page-about section h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-gold);
  margin: 0 0 var(--space-md);
  position: relative;
  display: inline-block;
}

.page-about section h2::after {
  content: '';
  display: block;
  width: 60%;
  height: 3px;
  background: var(--gradient-red-gold);
  margin-top: var(--space-xs);
}

/* 品牌故事 */
.page-about .about-story .story-content p {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-text);
  line-height: 1.6;
  margin: 0 0 var(--space-md);
}

.page-about .timeline-abstract {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
  padding-left: var(--space-lg);
  border-left: 2px solid var(--c-border);
}

.page-about .timeline-node {
  position: relative;
  padding: var(--space-sm) var(--space-md);
  background: var(--about-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  transition: background var(--transition), box-shadow var(--transition);
  cursor: default;
}

.page-about .timeline-node::before {
  content: '';
  position: absolute;
  left: -0.75rem;
  top: 1rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gradient-red-gold);
  box-shadow: 0 0 6px rgba(218,165,32,0.5);
}

.page-about .timeline-node[data-hover-expand]:hover {
  background: var(--c-dark);
  box-shadow: 0 0 15px rgba(218,165,32,0.2);
}

.page-about .node-number {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-gold);
  margin-right: var(--space-sm);
  vertical-align: middle;
}

.page-about .node-text {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-text);
  vertical-align: middle;
}

.page-about .node-detail {
  margin: var(--space-xs) 0 0 0;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--c-text-dim);
  line-height: 1.5;
}

/* 斜切分隔 */
.page-about .section-divider {
  height: var(--about-decor-height);
  background: var(--gradient-red-gold);
  clip-path: polygon(0 0, 100% 0, 100% 60%, 0 100%);
  margin: var(--space-lg) 0;
  opacity: 0.7;
}

.page-about .section-divider--flip {
  clip-path: polygon(0 40%, 100% 0, 100% 100%, 0 100%);
}

/* 核心能力 */
.page-about .about-capabilities .capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.page-about .data-card {
  background: var(--about-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.page-about .data-card:hover {
  border-color: var(--c-gold);
  box-shadow: 0 0 12px rgba(218,165,32,0.2);
}

.page-about .data-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-gold);
  margin: 0;
}

.page-about .data-card p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--c-text);
  line-height: 1.6;
  margin: 0;
  flex: 1;
}

.page-about .card-img {
  width: 100%;
  max-width: 250px;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
  margin: 0 auto;
}

.page-about .card-placeholder {
  width: 100%;
  height: 120px;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 4px,
    rgba(218,165,32,0.08) 4px,
    rgba(218,165,32,0.08) 8px
  );
  border: 1px dashed var(--c-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-dim);
  font-size: 0.75rem;
}

.page-about .capabilities-cta {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--c-text-dim);
  text-align: center;
  margin: var(--space-md) 0 0;
}

.page-about .capabilities-cta a {
  color: var(--c-gold);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .capabilities-cta a:hover {
  color: var(--c-gold-light);
}

/* 数据愿景 */
.page-about .about-vision .vision-content p {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-text);
  line-height: 1.6;
  margin: 0 0 var(--space-md);
}

.page-about .vision-img {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--c-glow);
  object-fit: cover;
  display: block;
  margin: 0 auto;
}

/* 联系链接 */
.page-about .about-contact {
  text-align: center;
  padding: var(--space-md) 0;
  border-top: 1px solid var(--c-border);
  margin-top: var(--space-lg);
}

.page-about .about-contact p {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--c-text);
  margin: 0;
}

.page-about .about-contact a {
  color: var(--c-gold);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .about-contact a:hover {
  color: var(--c-gold-light);
}

/* 桌面布局 */
@media (min-width: 768px) {
  .page-about .about-hero {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-manifesto {
    text-align: left;
    flex: 1;
  }

  .page-about .about-manifesto h1 {
    font-size: 3rem;
  }

  .page-about .about-manifesto .tagline::after {
    margin-left: 0;
  }

  .page-about .about-hero-img {
    flex-shrink: 0;
    margin: 0;
  }

  .page-about .about-story .story-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    align-items: start;
  }

  .page-about .timeline-abstract {
    padding-left: var(--space-lg);
    border-left-width: 3px;
  }

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

  .page-about .about-vision .vision-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-lg);
    align-items: center;
  }

  .page-about .vision-img {
    max-width: 100%;
  }

  .page-about section h2 {
    font-size: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: var(--space-lg) 0;
  }

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