<script>
document.documentElement.dataset.embed = window.location.search.includes('type=embed') ? "yep" : "nope";
</script>

<main>
  <h1>Styling <code>&lt;details&gt;</code>: Half opened disclosure widget</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>
      <summary>
        <span class="is-open">Read Less</span>
        <span class="is-closed">Read More</span>
      </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>
        <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>
        <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>
  </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://www.bol.com/be/nl/p/emerio-po-115984-pizzarette-6-personen/9200000094697866/" target="_top">https:/www.bol.com/</a></p>

  <h2>The Code</h2>
  
  <h3>UI</h3>
  
  <pre><code>/* Nothing special to report */</code></pre>
  
  <h3>Animation</h3>
  <pre><code>::details-content {
  content-visibility: visible; /* Make it always visible */
  
  transition: height 0.5s ease;
  height: 150px;
  overflow: clip;
}

[open]::details-content {
  height: calc-size(auto, size + 0.5rem); /* calc-size because we need to add a length */
}</code></pre>
</main>

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

#demo {
  padding-bottom: 2rem;
}

details {
  .is-open {
    display: none;
  }
  .is-closed {
    display: block;
  }
}

details[open] {
  .is-open {
    display: block;
  }
  .is-closed {
    display: none;
  }
}

details {
  background: white;
  position: relative;
  border-bottom: 1px solid #ccc;
}

summary {
  &::marker {
    content: '';
  }
  
  position: absolute;
  width: min-content;
  white-space: nowrap;
  color: blue;
  border: 1px solid blue;
  background: white;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.25s, color 0.25s;
  z-index: 2;
  
  &:hover {
    outline: 1px solid;
  }
  
  &:active {
    color: white;
    background: blue;
  }
  
  padding: 0.5rem 1rem;
  bottom: 0;
  left: 50%;
  transform: translate3d(-50%,50%,0)
}

.details-content-wrapper {
  padding: 0.5rem;
  
  &::before {
    content: '';
    height: 3rem;
    width: 100%;
    background-image: linear-gradient(to bottom, rgb(255 255 255 / 0), rgb(255 255 255 / 1));
    position: absolute;
    left: 0;
    bottom: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
  }
  
  [open] &::before {
    opacity: 0;
  }
}

::details-content {
  content-visibility: visible; /* Make it always visible */
  
  transition: height 0.5s ease;
  height: 150px;
  overflow: clip;
}

[open]::details-content {
  height: calc-size(auto, size + 0.5rem); /* calc-size because we need to add a length */
}

@layer reset {
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  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;
  }
}