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<main>
  <h1>Styling <code>&lt;details&gt;</code>: UIKit Accordion</h1>

  <p class="warning">Your browser does not support <code>::details-content</code>, so this demo won’t work as intended. Please use a browser with support – such as Chrome 131 or newer – to check out this page.</p>

  <h2>Demo</h2>
  
  <div id="demo">
    <details name="accordion" open>
      <summary>Item 1</summary>
      <div class="details-content-wrapper">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolor, aliquam. Veritatis consequatur, soluta molestiae voluptates accusamus qui odio, error, repellat rem harum id similique omnis quod dignissimos saepe quas mollitia.</p>
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolor, aliquam. Veritatis consequatur, soluta molestiae voluptates accusamus qui odio, error, repellat rem harum id similique omnis quod dignissimos saepe quas mollitia.</p>
      </div>
    </details>
    <details name="accordion">
      <summary>Item 2</summary>
      <div class="details-content-wrapper">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolor, aliquam. Veritatis consequatur, soluta molestiae voluptates accusamus qui odio, error, repellat rem harum id similique omnis quod dignissimos saepe quas mollitia.</p>
      </div>
    </details>
    <details name="accordion">
      <summary>Item 3</summary>
      <div class="details-content-wrapper">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
        <p>Dolor, aliquam. Veritatis consequatur, soluta molestiae voluptates accusamus qui odio, error, repellat rem harum id similique omnis quod dignissimos saepe quas mollitia.</p>
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
      </div>
    </details>
  </div>

  <p>Demo for <a href="https://developer.chrome.com/blog/styling-details" target="_top">https://developer.chrome.com/blog/styling-details</a>, built after <a href="https://getuikit.com/docs/accordion" target="_top">https://getuikit.com/docs/accordion</a></p>

  <h2>The Code</h2>
  
  <h3>UI</h3>
  
  <pre><code>/* Nothing out of the ordinary to report */</code></pre>
  
  <h3>Animation</h3>
  <pre><code>::details-content {
  display: block; /* Override UA */

  transition: all 0.5s ease, content-visibility 0.5s <strong>step-end</strong> allow-discrete;
  height: 0;
  overflow: clip; /* Clip off contents while animating */
}

@supports (interpolate-size: allow-keywords) {
  [open]::details-content {
    transition: all 0.5s ease, content-visibility 0.5s step-start allow-discrete;
    height: auto;
    padding-bottom: 0.5em;
  }
}
@supports not (interpolate-size: allow-keywords) {
  [open]::details-content {
    transition: all 0.5s ease, content-visibility 0.5s step-start allow-discrete;
    height: 150px; /* Arbitrarily chosen height */
    overflow-y: scroll; /* In case the contents should be taller than 150px */
  }
}

.details-content-wrapper {
  padding: 1rem 0.5rem;
  margin-trim: block;
}</code></pre>
</main>

@supports selector(::details-content) {
  .warning {
    display: none;
  }
}

details {
  background: white;
}

summary {
  font-size: 1.5rem;
  color: #333;
  cursor: pointer;
  height: 3rem;
  padding: 0 0.5rem;
  
  /* Roll our own marker */
  display: flex;
  justify-content: space-between;

  &::marker {
    content: "";
  }
  &::after {
    content: "+";
  }
  [open] &::after {
    content: "-";
  }

  &:hover {
    color: #666;
  }
}

.details-content-wrapper {
  padding: 1rem 0.5rem;

  /* We need margin-trim … */
  :first-child { margin-top: 0; }
  :last-child { margin-bottom: 0; }
}

::details-content {
  transition: all 0.5s ease, content-visibility 0.5s ease allow-discrete; /* Rely on the special animation powers of content-visibility */
  height: 0;
  overflow: clip; /* Clip off contents while animating */
}

@supports (interpolate-size: allow-keywords) {
  :root {
    interpolate-size: allow-keywords;
  }

  [open]::details-content {
    height: auto;
    padding-bottom: 0.5em;
  }
}
@supports not (interpolate-size: allow-keywords) {
  [open]::details-content {
    height: 150px; /* Arbitrarily chosen height */
    overflow-y: scroll; /* In case the contents should be taller than 150px */
  }
}

@layer reset {
  * {
    margin: 0;
    padding: 0;
  }

  html,
  body {
    height: 100%;
  }
  
  html {
    font-size: 14px;
  }
}

@layer baselayout {
  html {
    color: #444;
    font-family: system-ui;
    line-height: 1.42;
    
    overscroll-behavior-x: none;
    overflow: auto;
  }

  main {
    max-width: 90ch;
    margin: 0 auto;
    padding-bottom: 10rem;
  }

  p {
    margin-bottom: 1em;
  }
  
  h1, h2 {
    margin: 4em 0 1em;
  }
  h3 {
    margin: 1em 0 0.5em;
  }
  
  #demo {
    padding: 1em;
    border: 1px solid #ccc;
    background: #f4f6f9;
  }
}

@layer code {
  pre {
    border: 1px solid #dedede;
    padding: 1em;
    background: #f7f7f7;
    font-family: "Courier 10 Pitch", Courier, monospace;
    overflow-x: auto;
    border-left: 0.4em solid cornflowerblue;
    tab-size: 4;
  }

  code:not(pre code) {
    background: #f7f7f7;
    border: 1px solid rgb(0 0 0 / 0.2);
    padding: 0.1rem 0.3rem;
    margin: 0.1rem 0;
    border-radius: 0.2rem;
    /*      display: inline-block; */
    -webkit-box-decoration-break: clone;
    white-space: pre-wrap;
  }
}

@layer warning {
  .warning {
    box-sizing: border-box;
    padding: 1em;
    margin: 1em 0;
    border: 1px solid #ccc;
    background: rgba(255 255 205 / 0.8);
  }

  .warning > :first-child {
    margin-top: 0;
  }

  .warning > :last-child {
    margin-bottom: 0;
  }

  .warning a {
    color: blue;
  }
  .warning--info {
    border: 1px solid #123456;
    background: rgb(205 230 255 / 0.8);
  }
  .warning--alarm {
    border: 1px solid red;
    background: #ff000010;
  }
}

/* Hide a bunch of stuff when embedded */
:root[data-embed="yep"] {
  main {
    padding: 2em 1em;
    
    :not(p.warning, p.warning *, #demo, #demo *, #demo ~ p, #demo ~ p *) {
      display: none;
    }
  }
  #demo ~ p {
    margin-top: 1em;
    text-align: center;
  }
}