:root {
    --card-bg: #fff;
    --card-text: #334155;
    --card-secondary: #64748b;
    --table-header-bg: #f1f5f9;
    --table-header-text: #334155;
    --table-row-bg: #fff;
    --table-row-alt-bg: #f8fafc;
    --table-row-text: #334155;
    --table-row-highlight: #3b82f6;
  }
  
  .dark-mode {
    --card-bg: #1e293b;
    --card-text: #e2e8f0;
    --card-secondary: #cbd5e1;
    --table-header-bg: #334155;
    --table-header-text: #f1f5f9;
    --table-row-bg: #1e293b;
    --table-row-alt-bg: #0f172a;
    --table-row-text: #e2e8f0;
    --table-row-highlight: #60a5fa;
  }
  
  .converter-card {
    background: var(--card-bg);
    color: var(--card-text);
    border-radius: 1rem;
    box-shadow: 0 4px 24px rgba(30, 41, 59, 0.08);
    padding: 2rem 1.5rem;
    margin-bottom: 2rem;
  }
  
  .converter-card h3 {
    color: var(--card-text);
    font-weight: 600;
    margin-bottom: 1rem;
  }
  
  .converter-card p,
  .converter-card li {
    color: var(--card-secondary);
  }
  
  .converter-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 0.5rem;
  }
  
  .converter-table th {
    background: var(--table-header-bg);
    color: var(--table-header-text);
    font-weight: 600;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e2e8f0;
  }
  
  .converter-table td {
    background: var(--table-row-bg);
    color: var(--table-row-text);
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e2e8f0;
  }
  
  .converter-table tr:nth-child(even) td {
    background: var(--table-row-alt-bg);
  }
  
  .converter-table tr.highlight td {
    color: var(--table-row-highlight);
    font-weight: bold;
  }
  
  @media (max-width: 640px) {
    .converter-card {
      padding: 1.2rem 0.7rem;
    }
  
    .converter-table th,
    .converter-table td {
      padding: 0.5rem 0.5rem;
      font-size: 0.95rem;
    }
  }