<div class="knobs">
  <select name="hue" id="hue">
    <option>green</option>
    <option>lime</option>
    <option>yellow</option>
    <option>orange</option>
    <option>red</option>
    <option>pink</option>
    <option>purple</option>
    <option>violet</option>
    <option>indigo</option>
    <option>blue</option>
    <option>cyan</option>
    <option>teal</option>
  </select>
  
  <input id="chroma" type="range" min="0" max=".15" step="0.01" value="0.05">
</div>

<div class="android-homescreen snap-x">
  <section class="news">
    <header>
      <h2>News</h2>
    </header>
    <div class="card-list">
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
      <div class="card"></div>
    </div>
  </section>
  
  <main>
    <div class="status-bar"></div>
    <div class="snap-x">
      <section>
        <div class="datetime-widget">
          <time>7:20</time>
          <date>Monday, Sept 12</date>
        </div>
      </section>
      <section>
        <nav class="app-grid">
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
        </nav>
      </section>
      <section>
        <nav class="app-grid" style="align-content: start">
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
          <div class="app"></div>
        </nav>
      </section>
    </div>
    <footer>
      <nav>
        <div class="app"></div>
        <div class="app"></div>
        <div class="app"></div>
        <div class="app"></div>
        <div class="app"></div>
      </nav>
      <input type="search" placeholder="Ask Google..">
    </footer>
  </main>
</div>

@use postcss-nested;

@import "https://unpkg.com/open-props" layer(base);
@import "https://unpkg.com/open-props/normalize.min.css" layer(base);
@import "https://unpkg.com/open-props/oklch-hues.min.css" layer(base);
@import "https://unpkg.com/open-props/gray-oklch.min.css" layer(base);

/* these will be overwritten by the HTML controls and JS */
* {
  --gray-hue: var(--hue-green);
  --gray-chroma: .05;
  
  /* bring the color to focus and stuff */
  accent-color: var(--surface-4);
  outline-color: var(--surface-4);
}

/* this maps the 12 stable Open Props normalize adaptive vars to use the extended 15 vars from this okLCH beta pack */
html {
  --surface-1: var(--gray-14);
  --surface-2: var(--gray-12);
  --surface-3: var(--gray-10);
  --surface-4: var(--gray-9);
  
  --text-1: var(--gray-1);
  --text-2: var(--gray-3);
}

@media (prefers-color-scheme: light) {
  html {
    --surface-1: var(--gray-0);
    --surface-2: var(--gray-1);
    --surface-3: var(--gray-2);
    --surface-4: var(--gray-3);

    --text-1: var(--gray-14);
    --text-2: var(--gray-11);
  }
}

@layer android-homescreen {  
  .snap-x {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
  }
  
  .android-homescreen {
    scrollbar-width: none;
    overscroll-behavior-x: contain;

    &::-webkit-scrollbar {
      display: none;
    }
  }
  
  .android-homescreen,
  .android-homescreen :is(section, main) {
    scroll-snap-align: center;
    flex-shrink: 0;
    inline-size: 100%;
    block-size: 100%;
  }
  
  main {
    scroll-snap-stop: always;
  }
  
  .android-homescreen > section {
    animation: scroll-start 2ms;
  }
  
  .knobs {
    position: fixed;
    inset-block-start: var(--size-3);
    inset-inline-end: var(--size-3);
    
    display: grid;
    gap: var(--size-3);
  }
}

@keyframes scroll-start {
  from {
    scroll-snap-align: unset;
  }
  to {
    scroll-snap-align: center;
  }
}

@layer support {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .android-homescreen {
    background: var(--surface-2);
    border: var(--border-size-3) solid black;
    aspect-ratio: 9/16;
    inline-size: auto;
    max-inline-size: 95vw;
    max-block-size: 80vh;
    box-shadow: var(--shadow-6);
    border-radius: var(--radius-4);
  }
  
  .android-homescreen > section {
    background: var(--surface-1);
  }
  
  .status-bar {
    block-size: var(--size-5);
    background: var(--surface-3);
  }
  
  main {
    display: grid;
    grid-template-rows: auto 1fr auto;
  }
  
  nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--size-3);
    padding-inline: var(--size-3);
    padding-block: var(--size-3);
  }
  
  section {
    display: grid;
  }
  
  .app-grid {
    align-content: end;
  }
  
  .app {
    aspect-ratio: 1;
    border-radius: var(--radius-round);
    background: var(--surface-4);
  }
  
  footer {
    position: relative;
    display: grid;
  }
  
  footer::after {
    content: "";
    background: black;
    height: 3px;
    border-radius: 3px;
    position: absolute;
    inset-block-end: 3px;
    inline-size: 30%;
    inset-inline-start: 35%;
  }
  
  input[type="search"] {
    margin: var(--size-3);
    background: var(--surface-4);
    border-radius: var(--radius-round);
    justify-self: stretch;
  }
  
  input[type="search"]::placeholder {
    color: var(--text-2);
  }
  
  .news {
    overflow-y: auto;
  }
  
  .news > header {
    padding: var(--size-3);
  }
  
  .card-list {
    display: grid;
    gap: 1px;
    grid-auto-rows: var(--size-content-1);
  }
  
  .card {
    background: var(--surface-3);
  }
  
  .card-list > .card:first-child {
    border-radius: var(--radius-4) var(--radius-4) 0 0;
  }
  
  .datetime-widget {
    display: grid;
    align-content: start;
    padding: var(--size-3);
  }
  
  .datetime-widget > time {
    font-size: var(--font-size-6);
    font-weight: var(--font-weight-1);
    line-height: var(--font-lineheight-00);
  }
  
  .datetime-widget > date {
    font-size: var(--font-size-0);
  }
}

const state = {
  hue: 'green',
  chroma: 0.05,
}

hue.oninput = e => {
  state.hue = e.target.value
  update()
}

chroma.oninput = e => {
  state.chroma = parseFloat(e.target.value)
  update()
}

function update() {
  sheet.replaceSync(`* {
    --gray-hue: var(--hue-${state.hue});
    --gray-chroma: ${state.chroma};
  }`, 0)
}

const sheet = new CSSStyleSheet()
document.adoptedStyleSheets = [...document.adoptedStyleSheets, sheet]