html {
    scroll-behavior: smooth;
  }
  .product-detail {
    display: grid;
    grid-template-columns: 60% 40%;
    gap: 32px;
    align-items: start;
  }
  
  .info-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }
  
  .info-header {
    border-bottom: 1px solid #eee;
    padding-bottom: 16px;
  }
  
  .product-title {
    font-size: 28px;
    font-weight: bold;
    margin: 0 0 8px 0;
    color: var(--text);
  }
  
  .product-model-code {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary);
  }
  
  .product-subtitle {
    font-size: 16px;
    color: var(--muted);
    margin: 0;
  }
  
  .product-desc {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text);
    white-space: pre-wrap;
  }
  
  .specs-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--bg);
    padding: 16px;
    border-radius: 8px;
  }
  
  .spec-row {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed var(--border);
    padding-bottom: 8px;
  }
  .spec-row:last-child {
    border-bottom: none;
  }
  
  .spec-label {
    font-weight: bold;
    color: var(--text);
  }
  
  .spec-value {
    color: var(--text);
  }
  
  .action-buttons {
    display: flex;
    gap: 16px;
    margin-top: 10px;
  }
  
  .action-btn {
    flex: 1;
    padding: 12px;
    text-align: center;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
  }
  .action-btn.secondary {
    background: var(--surface);
    color: var(--primary);
    border: 1px solid var(--primary);
  }

  @media (max-width: 768px) {
    .product-detail {
      grid-template-columns: 1fr;
    }
  }

  .product-applications .applications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 20px;
  }

  .application-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
  }

  .application-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  }

  .application-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(232, 119, 34, 0.08);
    border-radius: 12px;
    color: var(--primary);
  }

  .application-item h4 {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
  }

  .application-item p {
    margin: 0;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.6;
  }

  .product-why-choose .why-choose-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 20px;
  }

  .why-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px 20px;
    position: relative;
    overflow: hidden;
  }

  .why-number {
    font-size: 48px;
    font-weight: 900;
    color: rgba(232, 119, 34, 0.1);
    position: absolute;
    top: 8px;
    right: 16px;
    line-height: 1;
  }

  .why-item h4 {
    margin: 0 0 10px;
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
  }

  .why-item p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
    line-height: 1.7;
  }

  .product-cta-section {
    margin-top: 16px;
  }

  .cta-card {
    background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    color: #fff;
    border-radius: 16px;
    padding: 40px;
    text-align: center;
  }

  .cta-card h3 {
    margin: 0 0 12px;
    font-size: 24px;
    font-weight: 800;
  }

  .cta-card p {
    margin: 0 0 24px;
    font-size: 15px;
    opacity: 0.8;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
  }

  .cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
  }

  .cta-actions .action-btn {
    padding: 12px 32px;
    font-size: 15px;
    border-radius: 8px;
    font-weight: 600;
  }

  .cta-actions .action-btn:not(.secondary) {
    background: var(--primary);
    border-color: var(--primary);
  }

  .cta-actions .action-btn.secondary {
    background: transparent;
    border: 2px solid rgba(255,255,255,0.3);
    color: #fff;
  }

  .cta-actions .action-btn.secondary:hover {
    border-color: #fff;
  }

  @media (max-width: 768px) {
    .product-applications .applications-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .product-why-choose .why-choose-grid {
      grid-template-columns: 1fr;
    }
    .cta-card {
      padding: 28px 20px;
    }
  }

  @media (max-width: 480px) {
    .product-applications .applications-grid {
      grid-template-columns: 1fr;
    }
  }

  /* 产品描述/参数区图片：始终铺满容器宽度，保持比例不裁剪（contain 思路） */
  .detail-content img,
  .params-html img {
    width: 100%;
    height: auto;
    display: block;
  }