* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #f5f7fb;
    color: #111;
  }
  
  .topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
  }
  
  .topbar h1 {
    margin: 0;
    font-size: 18px;
  }
  
  .topbar button {
    padding: 8px 14px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 6px;
    cursor: pointer;
  }
  
  .topbar button:hover {
    background: #f3f4f6;
  }
  
  .container {
    padding: 32px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
  }
  
  .card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    border: 1px solid #e5e7eb;
  }
  
  .card h2 {
    margin-top: 0;
    font-size: 16px;
  }
  
  .card p {
    font-size: 14px;
    color: #555;
  }
  
  .btn {
    display: inline-block;
    margin-top: 12px;
    padding: 8px 14px;
    background: #2563eb;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
  }
  
  .btn:hover {
    background: #1d4ed8;
  }