// Author: Sivan [sun.sivan@gmail.com]
// Description: panel list.

.panel-list {
  --bg-color: hsl(240, 100%, 100%);
  --bg-tap-color: hsl(300, 3%, 94%);
  --border-color: hsla(0, 0%, 76%, 0.88);
  --border-inline-start-color: hsl(0, 0%, 76%);
  --border-inline-end-color: hsl(0, 0%, 76%);
  --border-block-start-color: hsl(0, 0%, 79%);
  --border-block-end-color: hsl(0, 0%, 65%);
  --text-color: hsl(60, 1%, 16%);
  --box-shadow-color: hsla(0, 0%, 86%, 0.54);
  --bg-highlight-color-start: hsl(216, 87%, 70%);
  --bg-highlight-color-end: hsl(215, 93%, 52%);
  --bg-highlight-tap-color-start: hsl(216, 92%, 65%);
  --bg-highlight-tap-color-end: hsl(215, 95%, 44%);
  --border-highlight-color: hsla(216, 90%, 57%, 0.88);
  --border-highlight-tap-color: hsla(216, 85%, 52%, 0.88);
  --border-inline-start-highlight-color: hsl(216, 90%, 57%);
  --border-inline-end-highlight-color: hsl(216, 90%, 57%);
  --border-inline-start-highlight-tap-color: hsl(216, 85%, 52%);
  --border-inline-end-highlight-tap-color: hsl(216, 85%, 52%);
  --border-block-start-highlight-color: hsl(216, 87%, 63%);
  --border-block-end-highlight-color: hsl(215, 99%, 49%);
  --border-block-start-highlight-tap-color: hsl(216, 93%, 57%);
  --border-block-end-highlight-tap-color: hsl(216, 100%, 42%);
  --text-highlight-color: hsl(0, 0%, 100%);

  &--gray {
    --bg-color: hsl(180, 100%, 100%);
    --bg-tap-color: hsl(0, 0%, 94%);
    --border-color: hsla(0, 0%, 72%, 0.88);
    --border-inline-start-color: hsl(0, 0%, 76%);
    --border-inline-end-color: hsl(0, 0%, 76%);
    --border-block-start-color: hsl(0, 0%, 79%);
    --border-block-end-color: hsl(0, 0%, 65%);
    --text-color: hsl(0, 0%, 16%);
    --box-shadow-color: hsla(0, 0%, 86%, 0.54);
    --bg-highlight-color-start: hsl(225, 3%, 70%);
    --bg-highlight-color-end: hsl(228, 2%, 58%);
    --bg-highlight-tap-color-start: hsl(228, 2%, 58%);
    --bg-highlight-tap-color-end: hsl(240, 3%, 35%);
    --border-highlight-color: hsla(225, 2%, 64%, 0.88);
    --border-highlight-tap-color: hsla(228, 2%, 47%, 0.88);
    --border-inline-start-highlight-color: hsl(240, 3%, 59%);
    --border-inline-end-highlight-color: hsl(228, 2%, 54%);
    --border-inline-start-highlight-tap-color: hsl(240, 3%, 39%);
    --border-inline-end-highlight-tap-color: hsl(228, 3%, 39%);
    --border-block-start-highlight-color: hsl(240, 3%, 66%);
    --border-block-end-highlight-color: hsl(228, 2%, 50%);
    --border-block-start-highlight-tap-color: hsl(228, 2%, 51%);
    --border-block-end-highlight-tap-color: hsl(228, 4%, 26%);
    --text-highlight-color: hsl(0, 0%, 92%);
  }

  @media (prefers-color-scheme: dark) {
    --bg-color: hsl(225, 2%, 40%);
    --bg-tap-color: hsl(210, 2%, 49%);
    --border-color: hsla(210, 2%, 33%, 0.88);
    --border-inline-start-color: hsl(210, 2%, 33%);
    --border-inline-end-color: hsl(210, 2%, 33%);
    --border-block-start-color: hsl(225, 2%, 45%);
    --border-block-end-color: hsl(210, 2%, 40%);
    --text-color: hsl(0, 0%, 91%);
    --box-shadow-color: hsla(225, 4%, 21%, 0.54);
    --bg-highlight-color-start: hsl(216, 77%, 49%);
    --bg-highlight-color-end: hsl(216, 76%, 45%);
    --bg-highlight-tap-color-start: hsl(214, 83%, 55%);
    --bg-highlight-tap-color-end: hsl(215, 74%, 51%);
    --border-highlight-color: hsla(215, 77%, 47%, 0.88);
    --border-highlight-tap-color: hsla(215, 79%, 54%, 0.88);
    --border-inline-start-highlight-color: hsl(215, 77%, 47%);
    --border-inline-end-highlight-color: hsl(215, 77%, 47%);
    --border-inline-start-highlight-tap-color: hsl(215, 79%, 54%);
    --border-inline-end-highlight-tap-color: hsl(215, 79%, 54%);
    --border-block-start-highlight-color: hsl(216, 76%, 55%);
    --border-block-end-highlight-color: hsl(216, 76%, 44%);
    --border-block-start-highlight-tap-color: hsl(215, 84%, 60%);
    --border-block-end-highlight-tap-color: hsl(215, 74%, 51%);
    --text-highlight-color: hsl(0, 0%, 100%);

    &--gray {
      --bg-color: hsl(0, 0%, 40%);
      --bg-tap-color: hsl(0, 0%, 49%);
      --border-color: hsla(120, 1%, 34%, 0.88);
      --border-inline-start-color: hsl(0, 0%, 40%);
      --border-inline-end-color: hsl(360, 0%, 40%);
      --border-block-start-color: hsl(0, 0%, 46%);
      --border-block-end-color: hsl(120, 0%, 40%);
      --text-color: hsl(0, 0%, 91%);
      --box-shadow-color: hsla(0, 0%, 17%, 0.54);
      --bg-highlight-color-start: hsl(0, 0%, 60%);
      --bg-highlight-color-end: hsl(0, 0%, 60%);
      --bg-highlight-tap-color-start: hsl(0, 0%, 69%);
      --bg-highlight-tap-color-end: hsl(0, 0%, 69%);
      --border-highlight-color: hsla(0, 0%, 60%, 0.88);
      --border-highlight-tap-color: hsla(0, 0%, 69%, 0.88);
      --border-inline-start-highlight-color: hsl(0, 0%, 60%);
      --border-inline-end-highlight-color: hsl(0, 0%, 60%);
      --border-inline-start-highlight-tap-color: hsl(0, 0%, 69%);
      --border-inline-end-highlight-tap-color: hsl(0, 0%, 69%);
      --border-block-start-highlight-color: hsl(0, 0%, 64%);
      --border-block-end-highlight-color: hsl(0, 0%, 60%);
      --border-block-start-highlight-tap-color: hsl(0, 0%, 73%);
      --border-block-end-highlight-tap-color: hsl(0, 0%, 69%);
      --text-highlight-color: hsl(0, 0%, 15%);
    }
  }

  display: inline-flex;
  margin: 0;
  padding: 0;
  list-style-type: none;
  margin-inline-start: 16px;

  & + & {
    margin-inline-start: 12px;
  }

  label {
    position: relative;
    display: block;
    box-sizing: border-box;
    height: 20px;
    padding: 0;
    padding-inline-start: 12px;
    padding-inline-end: 12px;
    border: 1px solid;
    font-size: 12px;
    line-height: 18px;
    text-align: center;
    user-select: none;
    background-color: var(--bg-color);
    border-color: var(--border-color);
    border-block-start-color: var(--border-block-start-color);
    border-block-end-color: var(--border-block-end-color);
    color: var(--text-color);
    box-shadow: 0 1px 0 var(--box-shadow-color);

    &:active {
      background-color: var(--bg-tap-color);
    }
  }

  li {
    margin-inline-end: -1px;

    &:first-child label {
      border-top-left-radius: 4px;
      border-bottom-left-radius: 4px;
      border-inline-start-color: var(--border-inline-start-color);
    }

    &:last-child label {
      border-top-right-radius: 4px;
      border-bottom-right-radius: 4px;
      border-inline-end-color: var(--border-inline-end-color);
    }
  }

  input {
    display: none;

    &:checked + label {
      z-index: 1;
      background-image: linear-gradient(to bottom, var(--bg-highlight-color-start), var(--bg-highlight-color-end));
      border-color: var(--border-highlight-color);
      border-block-start-color: var(--border-block-start-highlight-color);
      border-block-end-color: var(--border-block-end-highlight-color);
      color: var(--text-highlight-color);

      &:active {
        background-image: linear-gradient(to bottom, var(--bg-highlight-tap-color-start), var(--bg-highlight-tap-color-end));
        border-color: var(--border-highlight-tap-color);
        border-block-start-color: var(--border-block-start-highlight-tap-color);
        border-block-end-color: var(--border-block-end-highlight-tap-color);
      }
    }
  }
}