*, *::after, *::before {
      box-sizing: border-box;
  }

  :root {
    font:1.2em/1.4 Arial, Helvetica, sans-serif;
  }

  body {
      padding: 0 0 1em;

  }


  header {
    background-color: oklch(0.3211 0 0);
    color: oklch(0.99 0.003 325);
    border: 5px solid oklch(0 0 0);
  }

  header ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  header a {
    color: oklch(0.99 0.003 325);
    text-decoration: none;
    display: block;
    padding: 0.5em 1em;
    border-top: 1px solid oklch(0.683 0 0);
  }

  header .title {
    font-size: 150%;
    font-style: italic;
    font-weight: bold;
    padding: 1em;
  }

  main {
    padding: 0 1em;
  }

  .cards {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .cards li {
    border: 5px solid oklch(0 0 0);
    margin-bottom: 1em;
  }

  .cards h2 {
    background-color: oklch(0.3211 0 0);
    color: oklch(0.99 0.003 325);
    margin: 0;
    padding: 0.5em 1em;
  }

  .cards .inner {
    padding: 0.5em 1em;
  }

  .sidebar {
    background-color: oklch(0.3211 0 0);
    border: 5px solid oklch(0 0 0);
    padding: 0.5em 1em;
    color: oklch(0.99 0.003 325);
  }



  @media screen and (min-width: 60em) {
      header {
          display: flex;
          justify-content: space-between;
          align-items: center;
      }

      header ul {
          display: flex;
      }

      header li {
          margin: 0;
      }

      header a {
          border: 0;
      }

      main {
          display: grid;
          grid-template-columns: 3fr 1fr;
          gap: 20px;
          margin-top: 20px;
      }

      .cards {
          display: grid;
          grid-template-columns: 1fr 1fr 1fr;
          gap: 20px;
      }
  }