/* 全局锚点偏移修复 */
  html {
    scroll-padding-top: 100px;
    scroll-behavior: smooth;
  }

  .certifications-page {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 3rem;
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    color: #1e293b;
    line-height: 1.5;
  }
  
  .page-header { margin-bottom: 2rem; }
  .page-header h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    color: #0f172a;
    border-bottom: 4px solid #2563eb;
    padding-bottom: 0.5rem;
    display: inline-block;
  }
  .subheadline { font-size: 1.1rem; color: #334155; max-width: 900px; margin-top: 0.75rem; }
  .intro-note {
    background: #f8fafc;
    padding: 1.5rem 1.8rem;
    border-radius: 24px;
    margin-bottom: 2.5rem;
    border: 1px solid #e2e8f0;
  }
  .badge-container { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.2rem; }
  .badge {
    background: #2563eb;
    color: white;
    padding: 0.4rem 1.2rem;
    border-radius: 40px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
  }
  .intro-text { font-size: 1rem; margin: 0; }
  
  /* 导航标签 */
  .cert-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.8rem;
    margin-bottom: 2.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #cbd5e1;
  }
  .tab-link {
    text-decoration: none;
    font-weight: 650;
    color: #1e293b;
    padding: 0.6rem 0.2rem;
    border-bottom: 3px solid transparent;
    transition: 0.2s;
    font-size: 1.1rem;
    cursor: pointer;
  }
  .tab-link:hover { border-bottom-color: #2563eb; color: #2563eb; }
  
  /* 各区块 */
  .cert-section {
    margin-bottom: 4rem;
    scroll-margin-top: 100px; /* 配合html的scroll-padding-top */
  }
  .alt-bg { background: #f9fafb; padding: 2.5rem 2rem; border-radius: 32px; }
  .cert-section h2 { font-size: 2rem; font-weight: 650; margin-bottom: 0.5rem; color: #0f172a; }
  .section-desc { font-size: 1.05rem; color: #475569; margin-bottom: 2rem; max-width: 950px; }
  
  /* 卡片网格 */
  .cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
  }
  .cert-grid-row1 { margin-bottom: 2rem; }
  .single-highlight .cert-grid { max-width: 700px; margin: 0 auto; }
  
  .cert-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 12px 28px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.02);
    border: 1px solid #e9eef3;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
  }
  .cert-card:hover { box-shadow: 0 24px 36px -10px rgba(0,35,70,0.12); transform: translateY(-4px); }
  
  .cert-image {
    background: #f1f5f9;
    padding: 1.2rem;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 260px;
  }
  .cert-image.portrait { min-height: 360px; }
  .cert-image.landscape { min-height: 220px; }
  .cert-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    background: white;
    padding: 6px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  }
  .cert-image.portrait img { max-height: 380px; }
  .cert-image.landscape img { max-height: 240px; }
  .cert-image img[src*="placeholder"] { background: #dbeafe; min-width: 180px; }
  
  .cert-caption { padding: 1.2rem 1.2rem 1.5rem; text-align: center; }
  .cert-caption h3 { font-size: 1.1rem; font-weight: 700; margin: 0; color: #0b1e3a; line-height: 1.4; }
  
  /* CTA */
  .cta-block {
    margin-top: 3.5rem;
    background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
    border-radius: 36px;
    padding: 3rem 2.5rem;
    color: white;
    text-align: center;
  }
  .cta-content { text-align: center; width: 100%; }
  .cta-content h2,
  .cta-content p,
  .cta-content .small-note {
    text-align: center !important;
    margin-left: auto !important;
    margin-right: auto !important;
  }
  .cta-content h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 1rem; color: white; }
  .cta-content p { font-size: 1.15rem; opacity: 0.9; max-width: 720px; }
  .cta-button {
    display: inline-block;
    background: #3b82f6;
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
    padding: 1rem 3rem;
    border-radius: 60px;
    text-decoration: none;
    margin: 1.8rem 0 1rem;
    border: 2px solid white;
    transition: 0.2s;
    box-shadow: 0 8px 18px rgba(0,0,0,0.25);
  }
  .cta-button:hover { background: white; color: #0f172a; border-color: #0f172a; }
  .small-note { font-size: 0.95rem; opacity: 0.7; max-width: 600px; }
  
  /* 响应式 */
  @media (max-width: 640px) {
    .certifications-page { padding: 1rem 1rem 2rem; }
    .page-header h1 { font-size: 1.9rem; }
    .cert-tabs { gap: 0.75rem; }
    .cert-section h2 { font-size: 1.6rem; }
    .cta-content h2 { font-size: 1.8rem; }
    .cert-grid { grid-template-columns: 1fr; }
    .cert-image.portrait { min-height: 300px; }
    .cert-image.landscape { min-height: 180px; }
    .cert-image.portrait img { max-height: 320px; }
  }
  
  strong { font-weight: 650; color: #0f172a; }