body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #334155; /* slate blue */
    color: white;
    margin: 0;
    padding: 0;
    text-align: center;
  }
  
  header {
    background-color: #1e293b; /* darker slate */
    padding: 2rem 1rem;
  }
  
  main {
    padding: 2rem;
  }

  .intro {
    max-width: 900px;
    margin: 0 auto 2rem auto;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    max-width: 1100px;
    margin: 0 auto;
  }

  .card {
    background: #1f2937;
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 1.25rem;
    text-align: left;
  }

  .stack {
    display: grid;
    gap: .75rem;
  }

  label {
    font-size: .95rem;
    display: grid;
    gap: .35rem;
  }

  input, select, textarea, button {
    font: inherit;
  }

  input, select, textarea {
    background: #0f172a;
    color: #e5e7eb;
    border: 1px solid #334155;
    border-radius: 8px;
    padding: .6rem .7rem;
  }

  button, .btn {
    background: #10b981;
    color: #03121a;
    border: none;
    border-radius: 8px;
    padding: .65rem .9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
  }

  .narrow {
    max-width: 800px;
    margin: 2rem auto;
    text-align: left;
  }

  .results {
    display: grid;
    gap: .75rem;
  }
  
  footer {
    background-color: #1e293b;
    padding: 1rem;
    font-size: 0.9rem;
  }