.page-about {
  --page-bg: var(--color-surface, #F4F6F9);
  --page-text: var(--color-text-primary, #1A1A1A);
  --page-accent: var(--color-accent, #FF6B35);
  --page-primary: var(--color-primary, #0B1D3A);
  --page-border: var(--color-border, #D1D5DB);
  --page-success: var(--color-success, #27AE60);
  --page-timeline-dot-size: 20px;
  --page-timeline-line-width: 3px;

  display: block;
  width: 100%;
  background: var(--page-bg);
  color: var(--page-text);
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  line-height: var(--line-height-body, 1.6);
  padding: 1rem 0 3rem;
}

/* 容器 */
.page-about__inner {
  max-width: var(--container-max, 1200px);
  margin: 0 auto;
  padding: 0 1rem;
}

/* 面包屑 */
.page-about__breadcrumb {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--font-size-small, 14px);
  color: var(--color-text-secondary, #5A5A5A);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.page-about__breadcrumb a {
  color: var(--color-text-secondary, #5A5A5A);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast, 0.2s ease);
}

.page-about__breadcrumb a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--page-accent);
  transition: width var(--transition-fast, 0.2s ease);
}

.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus {
  color: var(--page-accent);
  outline: none;
}

.page-about__breadcrumb a:hover::after,
.page-about__breadcrumb a:focus::after {
  width: 100%;
}

.page-about__sep {
  margin: 0 0.5rem;
  color: var(--page-accent);
}

/* Hero 区域 */
.page-about__hero {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.page-about__hero-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.page-about__hero-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(11, 29, 58, 0.08);
}

.page-about__tagline-block {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--page-primary);
  text-align: center;
  line-height: var(--line-height-heading, 1.4);
  margin: 0;
  padding: 0.5rem 1rem;
  background: var(--page-primary);
  color: #fff;
  border-left: 4px solid var(--page-accent);
  max-width: 300px;
}

.page-about__hero-right {
  display: flex;
  justify-content: center;
}

.page-about__flow-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(11, 29, 58, 0.06);
}

/* 通用区块标题 */
.page-about__section-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--font-size-h2, 32px);
  font-weight: 700;
  color: var(--page-primary);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  position: relative;
  display: inline-block;
}

.page-about__section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--page-accent);
  border-radius: 2px;
}

/* 页面段落 */
.page-about__para {
  font-size: var(--font-size-body, 16px);
  line-height: var(--line-height-body, 1.6);
  color: var(--page-text);
  margin: 0 0 1rem;
}

.page-about__brand-content {
  max-width: 680px;
}

/* 品牌由来 */
.page-about__brand {
  margin-bottom: 2.5rem;
}

/* 服务网格 */
.page-about__services {
  margin-bottom: 2.5rem;
}

.page-about__services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about__service-item {
  background: var(--color-background, #fff);
  border: 1px solid var(--page-border);
  border-radius: 6px;
  padding: 1.25rem;
  transition: box-shadow var(--transition-fast, 0.2s ease), transform var(--transition-fast, 0.2s ease);
  cursor: default;
}

.page-about__service-item:hover {
  box-shadow: 0 6px 18px rgba(11, 29, 58, 0.1);
  transform: translateY(-2px);
}

.page-about__service-item[data-service]:hover {
  border-color: var(--page-accent);
}

.page-about__service-icon {
  font-size: 1.8rem;
  display: inline-block;
  margin-bottom: 0.5rem;
  color: var(--page-accent);
}

.page-about__service-name {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: var(--font-size-h3, 24px);
  font-weight: 700;
  color: var(--page-primary);
  margin: 0 0 0.35rem;
}

.page-about__service-desc {
  font-size: var(--font-size-body, 16px);
  color: var(--color-text-secondary, #5A5A5A);
  margin: 0;
  line-height: var(--line-height-body, 1.6);
}

/* 时间轴 */
.page-about__timeline {
  margin-bottom: 2.5rem;
}

.page-about__timeline-intro {
  font-size: var(--font-size-body, 16px);
  color: var(--color-text-secondary, #5A5A5A);
  margin: 0 0 1.5rem;
  max-width: 540px;
}

.page-about__timeline-wrapper {
  position: relative;
  padding-left: calc(var(--page-timeline-dot-size) + 1rem);
  margin-bottom: 1.5rem;
}

.page-about__timeline-line {
  position: absolute;
  left: calc(var(--page-timeline-dot-size) / 2);
  top: 0;
  bottom: 0;
  width: var(--page-timeline-line-width);
  background: var(--page-accent);
  border-radius: 2px;
  opacity: 0.5;
}

.page-about__timeline-node {
  position: relative;
  margin-bottom: 1.75rem;
  cursor: default;
  transition: opacity var(--transition-fast, 0.2s ease);
}

.page-about__timeline-node:last-child {
  margin-bottom: 0;
}

.page-about__node-dot {
  position: absolute;
  left: calc(-1 * var(--page-timeline-dot-size) - 1rem + 1px);
  top: 4px;
  width: var(--page-timeline-dot-size);
  height: var(--page-timeline-dot-size);
  border-radius: 50%;
  background: var(--page-accent);
  border: 3px solid var(--color-background, #fff);
  box-shadow: 0 0 0 2px var(--page-accent);
  z-index: 1;
  transition: transform var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
}

.page-about__timeline-node:hover .page-about__node-dot,
.page-about__timeline-node:focus .page-about__node-dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 4px var(--page-accent), 0 0 12px rgba(255, 107, 53, 0.35);
}

.page-about__node-content {
  background: var(--color-background, #fff);
  border: 1px solid var(--page-border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  transition: box-shadow var(--transition-fast, 0.2s ease);
}

.page-about__timeline-node:hover .page-about__node-content,
.page-about__timeline-node:focus .page-about__node-content {
  box-shadow: 0 4px 14px rgba(11, 29, 58, 0.08);
}

.page-about__node-title {
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--page-primary);
  margin: 0 0 0.3rem;
}

.page-about__node-desc {
  font-size: var(--font-size-small, 14px);
  color: var(--color-text-secondary, #5A5A5A);
  margin: 0;
  line-height: var(--line-height-body, 1.6);
}

.page-about__timeline-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  margin-top: 0.5rem;
  display: block;
}

/* CTA */
.page-about__cta {
  background: var(--page-primary);
  color: #fff;
  padding: 2rem 1.5rem;
  border-radius: 6px;
  text-align: center;
  margin-top: 1.5rem;
}

.page-about__cta-text {
  font-size: var(--font-size-body, 16px);
  line-height: var(--line-height-body, 1.6);
  margin: 0 0 1.25rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.page-about__cta-links .btn-primary {
  display: inline-block;
  background: var(--page-accent);
  color: #fff;
  padding: 0.65rem 1.5rem;
  border-radius: 4px;
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
}

.page-about__cta-links .btn-primary:hover,
.page-about__cta-links .btn-primary:focus {
  background: #e55a2b;
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.4);
  outline: none;
}

.page-about__cta-links .btn-outline {
  display: inline-block;
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
  padding: 0.55rem 1.4rem;
  border-radius: 4px;
  font-family: var(--font-heading, 'Helvetica Neue', Arial, sans-serif);
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}

.page-about__cta-links .btn-outline:hover,
.page-about__cta-links .btn-outline:focus {
  background: #fff;
  color: var(--page-primary);
  outline: none;
}

/* 桌面端样式 */
@media (min-width: 768px) {
  .page-about {
    padding: 2rem 0 4rem;
  }

  .page-about__inner {
    padding: 0 2rem;
  }

  .page-about__hero {
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }

  .page-about__hero-left {
    flex: 0 0 300px;
    align-items: flex-start;
  }

  .page-about__tagline-block {
    text-align: left;
    font-size: 2rem;
    max-width: 100%;
  }

  .page-about__hero-right {
    flex: 1;
    align-items: flex-start;
  }

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

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

  .page-about__timeline-wrapper {
    padding-left: calc(var(--page-timeline-dot-size) + 2rem);
  }

  .page-about__node-dot {
    left: calc(-1 * var(--page-timeline-dot-size) - 2rem + 1px);
  }

  .page-about__cta {
    padding: 3rem 2rem;
  }
}