sidepanel/styles.css
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  }
  
  .container {
    padding: 16px;
  }
  
  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
  }
  
  .header h1 {
    margin: 0;
    font-size: 1.5em;
  }
  
  .history-entry {
    padding: 12px;
    border: 1px solid #eee;
    margin-bottom: 12px;
    border-radius: 6px;
  }
  
  .entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
  }
  
  .entry-title {
    font-weight: bold;
    font-size: 1.1em;
  }
  
  .entry-time {
    font-size: 0.8em;
    color: #666;
  }
  
  .entry-url {
    font-size: 0.9em;
    color: #0066cc;
    margin: 4px 0;
    word-break: break-all;
  }
  
  .entry-headings {
    margin-top: 8px;
  }
  
  .h1 {
    font-size: 1.1em;
    font-weight: bold;
    margin: 4px 0;
  }
  
  .h2 {
    font-size: 1em;
    margin: 3px 0 3px 12px;
  }
  
  .h3 {
    font-size: 0.9em;
    color: #666;
    margin: 2px 0 2px 24px;
  }
  
  #clear-history {
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid #ccc;
    background: #fff;
    cursor: pointer;
  }
  
  #clear-history:hover {
    background: #f5f5f5;
  }