/* ========== page-about 专属样式 ========== */
.page-about {
  --about-timeline-color: #7BC043;
  --about-card-hover: #f0fdf4;
  --about-legacy-bg: #f5f0e8;
  --about-legacy-border: #d4c9a8;
  --about-timeline-dot: 14px;

  padding: var(--spacing-lg) var(--spacing-md);
  max-width: var(--content-max);
  margin: 0 auto;
}

/* 面包屑（共享 .breadcrumb 已在 site_kit，但页面内加样式避免冲突） */
.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 14px;
  margin-bottom: var(--spacing-lg);
  color: var(--text-muted);
}
.page-about .breadcrumb a {
  color: var(--secondary);
  text-decoration: underline;
}
.page-about .breadcrumb a:hover {
  color: var(--primary);
}
.page-about .breadcrumb span[aria-hidden] {
  margin: 0 var(--spacing-xs);
}

/* 页面标题 */
.page-about .page-title {
  font-family: var(--font-heading);
  font-size: 48px;
  color: var(--secondary);
  margin-bottom: var(--spacing-xl);
  text-transform: uppercase;
  letter-spacing: 2px;
  position: relative;
  display: inline-block;
}
.page-about .page-title::after {
  content: '';
  display: block;
  width: 80px;
  height: var(--border-width);
  background: var(--primary);
  margin-top: var(--spacing-xs);
}

/* ===== 品牌故事 ===== */
.page-about .about-story {
  margin-bottom: var(--spacing-xl);
}
.page-about .story-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}
.page-about .story-text {
  order: 2;
}
.page-about .story-lead {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-primary);
  font-weight: 600;
}
.page-about .story-visual {
  order: 1;
}
.page-about .img-square {
  width: 100%;
  height: auto;
  max-width: 400px;
  display: block;
  border: var(--border-width) solid var(--primary);
  box-shadow: var(--shadow-strong);
  object-fit: cover;
  aspect-ratio: 4/3;
}
/* 时间线 */
.page-about .timeline {
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0 0 0;
  position: relative;
  padding-left: 40px;
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--about-timeline-color);
}
.page-about .timeline-node {
  position: relative;
  margin-bottom: var(--spacing-md);
  cursor: pointer;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid transparent;
  border-radius: 0;
  transition: border-color 0.2s, background 0.2s;
}
.page-about .timeline-node:hover,
.page-about .timeline-node:focus-visible {
  border-color: var(--primary);
  background: #f2fcec;
  outline: none;
}
.page-about .timeline-marker {
  position: absolute;
  left: -40px;
  top: 16px;
  width: var(--about-timeline-dot);
  height: var(--about-timeline-dot);
  background: var(--primary);
  border: 3px solid var(--bg-light);
  box-shadow: 0 0 0 2px var(--primary);
  border-radius: 50%;
}
.page-about .timeline-label {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--secondary);
  display: block;
  margin-bottom: 4px;
}
.page-about .timeline-detail {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
  transition: max-height 0.3s ease;
  overflow: hidden;
  max-height: 0;
}
.page-about .timeline-node[data-detail]:focus .timeline-detail,
.page-about .timeline-node[data-detail]:hover .timeline-detail,
.page-about .timeline-node[data-detail]:focus-within .timeline-detail {
  max-height: 100px;
  margin-top: var(--spacing-xs);
}

/* ===== 核心服务 ===== */
.page-about .about-services {
  margin-bottom: var(--spacing-xl);
}
.page-about .card-group {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}
.page-about .service-card {
  perspective: 1000px;
  min-height: 280px;
  background: transparent;
  border: none;
  box-shadow: none;
}
.page-about .service-card .card-front,
.page-about .service-card .card-back {
  padding: var(--spacing-md);
  border: var(--border-width) solid var(--primary);
  box-shadow: var(--shadow-strong);
  background: #fff;
  transition: transform 0.4s ease;
  backface-visibility: hidden;
  position: relative;
}
.page-about .service-card .card-front {
  z-index: 2;
}
.page-about .service-card .card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotateY(180deg);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--about-card-hover);
  padding: var(--spacing-md);
}
.page-about .service-card:hover .card-front,
.page-about .service-card:focus-within .card-front {
  transform: rotateY(180deg);
}
.page-about .service-card:hover .card-back,
.page-about .service-card:focus-within .card-back {
  transform: rotateY(0deg);
}
.page-about .service-icon {
  width: 64px;
  height: 64px;
  object-fit: contain;
  display: block;
  margin-bottom: var(--spacing-sm);
}
.page-about .card-title {
  font-family: var(--font-heading);
  font-size: 24px;
  color: var(--secondary);
  margin-bottom: var(--spacing-sm);
}
.page-about .service-card p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
}
.page-about .service-card .btn {
  margin-top: var(--spacing-sm);
}
.page-about .service-cta {
  margin-top: var(--spacing-lg);
  text-align: center;
}

/* ===== 历史版本 ===== */
.page-about .about-legacy {
  margin-bottom: var(--spacing-xl);
  background: var(--about-legacy-bg);
  border: var(--border-width) solid var(--about-legacy-border);
  box-shadow: var(--shadow-strong);
  padding: var(--spacing-lg);
}
.page-about .legacy-wrapper {
  display: grid;
  gap: var(--spacing-lg);
  align-items: center;
}
.page-about .legacy-content p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
}
.page-about .legacy-content .btn {
  margin-top: var(--spacing-md);
}
.page-about .img-legacy {
  width: 100%;
  height: auto;
  max-width: 600px;
  display: block;
  border: var(--border-width) solid var(--primary);
  box-shadow: var(--shadow-soft);
  object-fit: cover;
  aspect-ratio: 3/2;
  filter: sepia(0.3) contrast(0.9);
}

/* ===== 联系我们 ===== */
.page-about .about-contact {
  margin-bottom: var(--spacing-xl);
}
.page-about .contact-block {
  background: var(--bg-light);
  border: var(--border-width) solid var(--secondary);
  box-shadow: var(--shadow-strong);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}
.page-about .contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}
.page-about .contact-link,
.page-about .contact-phone {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--secondary);
  font-weight: 600;
}
.page-about .contact-link:hover {
  color: var(--primary);
}
.page-about .contact-note {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: var(--spacing-xs);
}
.page-about .contact-links .btn {
  margin-top: var(--spacing-sm);
}

/* ===== 响应式 (移动端优先) ===== */
@media (max-width: 640px) {
  .page-about {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  .page-about .page-title {
    font-size: 36px;
  }
  .page-about .story-grid {
    grid-template-columns: 1fr;
  }
  .page-about .story-visual {
    width: 100%;
    text-align: center;
  }
  .page-about .img-square {
    max-width: 100%;
  }
  .page-about .card-group {
    grid-template-columns: 1fr;
  }
  .page-about .legacy-wrapper {
    grid-template-columns: 1fr;
  }
  .page-about .timeline {
    padding-left: 30px;
  }
  .page-about .timeline::before {
    left: 12px;
  }
  .page-about .timeline-marker {
    width: 10px;
    height: 10px;
    left: -30px;
    top: 14px;
  }
  .page-about .contact-item {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 641px) and (max-width: 1023px) {
  .page-about .story-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .story-visual {
    order: 1;
  }
  .page-about .story-text {
    order: 2;
  }
  .page-about .card-group {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .legacy-wrapper {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .story-grid {
    grid-template-columns: 1.5fr 1fr;
    align-items: center;
  }
  .page-about .story-visual {
    order: 2;
  }
  .page-about .story-text {
    order: 1;
  }
  .page-about .card-group {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .legacy-wrapper {
    grid-template-columns: 1fr 1fr;
  }
}