*, *::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(1 0 0);
    border: 5px solid oklch(0 0 0);
  }

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

  header a {
    color: oklch(1 0 0);
    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(1 0 0);
    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(1 0 0);
  }


  main {
      max-width: 80rem;
      margin-inline: auto;
  }


  @media (min-width: 40em) {


      header {
          display: flex;
          align-items: center;
          justify-content: space-between;
          gap: 1rem;
          padding-inline: 1rem;
      }


      header a {
          border-top: 0;
      }

      header ul {
          display: flex;
          gap: 0.5rem;
      }


      main {
          display: flex;
          gap: 1rem;
          align-items: stretch;
          padding: 1rem;
      }

      article {
          flex: 3;
      }

      .sidebar {
          flex: 1;
      }


      .cards {
          display: grid;
          grid-template-columns: repeat(2, minmax(0, 1fr));
          gap: 1rem;
      }

      .cards li {
          margin-bottom: 0;
      }
  }