/* 主要内容区域 */
.section {
    padding: var(--spacing-xxxl) 0;
  }
  
  .section-title {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    position: relative;
  }
  
  .section-title h2 {
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
    display: inline-block;
    margin-bottom: var(--spacing-md);
    position: relative;
  }
  
  .section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--color-primary);
  }
  
  .section-title p {
    font-size: var(--font-size-large);
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
  }
  
  /* 公司简介 */
  .about-intro {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-md);
    overflow: hidden;
    margin-top: -50px;
    position: relative;
    z-index: 10;
  }
  
  .intro-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
  }
  
  .intro-image {
    flex: 1;
    min-width: 300px;
    height: 400px;
    background: url('../images/about.jpg') center/cover;
  }
  
  .intro-text {
    flex: 1;
    min-width: 300px;
    padding: var(--spacing-xxl);
  }
  
  .intro-text h2 {
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
  }
  
  .intro-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    line-height: 1.7;
  }
  
  .mission-vision {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
  }
  
  .mv-card {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    background: var(--color-background-light);
    border-left: 4px solid var(--color-primary);
    transition: var(--transition-normal);
  }
  
  .mv-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-sm);
  }
  
  .mv-card h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
  }
  
  .mv-card h3 i {
    color: var(--color-primary);
  }
  
  /* 发展历程 */
  .history-section {
    background: var(--color-background-light);
    position: relative;
  }
  
  .timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
  }
  
  .timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    background: var(--color-primary);
  }
  
  .timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xxl);
    width: 100%;
    display: flex;
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
  }
  
  .timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .timeline-item:nth-child(odd) {
    justify-content: flex-start;
  }
  
  .timeline-item:nth-child(even) {
    justify-content: flex-end;
  }
  
  .timeline-content {
    width: 45%;
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--box-shadow-sm);
    position: relative;
    border-top: 3px solid var(--color-secondary);
  }
  
  .timeline-content::before {
    content: '';
    position: absolute;
    top: 30px;
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    z-index: 1;
  }
  
  .timeline-item:nth-child(odd) .timeline-content::before {
    right: -32px;
  }
  
  .timeline-item:nth-child(even) .timeline-content::before {
    left: -32px;
  }
  
  .timeline-year {
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
  }
  
  .timeline-title {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
  }
  
  .timeline-content p {
    color: var(--color-text);
    line-height: 1.7;
  }
  
  /* 企业文化 */
  .culture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
  }
  
  .culture-card {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xxl) var(--spacing-xl);
    text-align: center;
    transition: var(--transition-normal);
    box-shadow: var(--box-shadow-sm);
    opacity: 0;
    transform: translateY(30px);
  }
  
  .culture-card.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .culture-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow-md);
  }
  
  .culture-icon {
    width: 80px;
    height: 80px;
    background: rgba(26, 58, 143, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-xl);
    font-size: var(--font-size-xlarge);
    color: var(--color-secondary);
  }
  
  .culture-card h3 {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
  }
  
  .culture-card p {
    color: var(--color-text);
    line-height: 1.7;
  }
  
  /* 资质荣誉 */
  .certificates-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
  }
  
  .certificate-card {
    background: var(--color-background);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
  }
  
  .certificate-card.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  .certificate-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow-md);
  }
  
  .certificate-img {
    height: 220px;
    background: var(--color-background-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xxlarge);
    color: var(--color-secondary);
    position: relative;
    overflow: hidden;
  }
  
  .certificate-img::before {
    content: '证书预览';
    position: absolute;
    color: var(--color-text-light);
    font-size: var(--font-size-large);
  }
  
  .certificate-content {
    padding: var(--spacing-lg);
    text-align: center;
    border-top: 3px solid var(--color-primary);
  }
  
  .certificate-content h3 {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
  }
  
  .certificate-content p {
    color: var(--color-text-light);
    font-size: var(--font-size-small);
  }
  
  /* 响应式设计 */
  @media (max-width: 992px) {
    .timeline::before {
      left: 30px;
    }
    
    .timeline-item {
      justify-content: flex-start !important;
      padding-left: 70px;
    }
    
    .timeline-content {
      width: 100%;
    }
    
    .timeline-content::before {
      left: -32px !important;
    }
  }
  
  @media (max-width: 768px) {
    .section {
      padding: var(--spacing-xxl) 0;
    }
    
    .intro-content {
      flex-direction: column;
    }
    
    .intro-image {
      width: 100%;
      height: 300px;
    }
    
    .intro-text {
      padding: var(--spacing-xl);
    }
    
    .page-banner {
      padding: 130px 0 60px;
    }
    
    .page-banner h1 {
      font-size: var(--font-size-xlarge);
    }
  }
  
  @media (max-width: 576px) {
    .section-title h2 {
      font-size: var(--font-size-large);
    }
    
    .timeline-item {
      padding-left: 50px;
    }
    
    .breadcrumb {
      flex-wrap: wrap;
    }
    
    .breadcrumb li::after {
      margin: 0 var(--spacing-xs);
    }
  }
  
  /* 动画效果 */
  @keyframes fadeInDown {
    from {
      opacity: 0;
      transform: translateY(-30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }