:root {
  --font: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, serif;
  --fsize: clamp(1em, 1em + 0.6vi, 2em);

  --pad: 2ch;

  --colf0: lch(3% 0 0);
  --colf1: lch(55% 20 87);
  --colf2: lch(100% 1 110);

  --colb0: lch(93% 8 93);
  --colb1: lch(97% 6 103);
  --colb2: lch(20% 20 33);

  -webkit-text-size-adjust: none;
  -moz-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeSpeed;
  image-rendering: -webkit-optimize-contrast;
  interpolate-size: allow-keywords;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
  scrollbar-width: thin;
}

html {
  writing-mode: horizontal-tb;
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
  color: var(--colf0);
  background-color: var(--colb0);
  box-sizing: border-box;
}

body {
  font-family: var(--font);
  font-weight: normal;
  font-size: var(--fsize);
  line-height: 1.5;
  touch-action: manipulation;
}

h1, h2 {
  font-size: 2em;
  font-weight: 600;
  line-height: 1.1;
}

h2 {
  font-size: 1.5em;
}

p {
  margin-block-start: 1em;
}

h2 + p {
  margin-block-start: 0;
}

.inner {
  max-inline-size: 50em;
  margin-inline: auto;
  padding-inline: var(--pad);
  padding-block: calc(2 * var(--pad));
}

.alt {
  background-color: var(--colb1);
}

.split {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--pad);

  & > section {
    flex: 1 2 18.5em;
  }

  & > :is(ul, img) {
    flex: 2 1 26.5em;
  }

}

.alt .split {
  flex-direction: row-reverse;
}

iframe {
  block-size: 90vb;
}

.images {
  list-style-type: none;
  display: grid;
  align-items: start;
  grid-auto-flow: row;
  align-content: start;
  grid-template-columns: repeat( auto-fill, minmax(12em, 1fr));
  gap: var(--pad);

  img {
    border: 1px solid #000;
  }
}

img {
  display: block;
  inline-size: 100%;
  block-size: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  overflow: hidden;
}

.features {

  margin-block: var(--pad);

  li {
    margin-block-start: 0.2em;
    margin-inline-start: 1.2em;
  }

  li.note {
    list-style-type: none;
    font-style: italic;
    margin-block-start: 0;
    color: var(--colf1);
  }

  strong {
    display: inline-block;
    inline-size: 6em;
  }

}

.features.col {

  columns: 2 20em;

  strong {
    display: block;
    inline-size: 10em;

    @media (width > 400px) {
      display: inline-block;
    }
  }

}

.button {
  display: block;
  inline-size: 9em;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  padding-block: 0.2em;
  margin-inline: auto;
  color: var(--colb1);
  background-color: var(--colb2);
  border-radius: 5px;

  &:hover, &:active, &:focus {
    color: var(--colf1);
  }
}

header {

  color: var(--colf2);
  background-color: var(--colb2);

  p {
    float: inline-end;
    margin: 0;
  }

  .button {
    display: inline-block;
    margin-inline-start: var(--pad);
    color: var(--colb2);
    background-color: var(--colf1);

    &:hover, &:active, &:focus {
      color: var(--colf0);
      background-color: var(--colb0);
    }
  }

  figure {

    position: relative;
    margin-block: 0.5em;

    img {
      aspect-ratio: 2 / 1;
      object-position: 50% 70%;
    }

    figcaption {
      font-size: 1.5em;
      font-weight: 600;
      line-height: 1.2;
      color: var(--colf1);
      text-shadow: 0 1px 2px #000;

      @media (width > 400px) {
        position: absolute;
        inset: 0;
        inset-block-start: auto;
        padding-block-start: 2em;
        background-image: linear-gradient(to top, var(--colb2) 0%, var(--colb2) 25%, transparent 100%);
      }

    }

    span {
      display: block;
      color: var(--colf2);
    }

  }

}

dialog {
  position: fixed;
  inline-size: 100dvi;
  block-size: 100dvb;
  max-inline-size: calc(100dvi - (2 * var(--pad)));
  max-block-size: calc(100dvb - (2 * var(--pad)));
  margin: auto;
  padding: 0;
  border: 0 none;
  outline: 0 none;
  background-color: transparent;
  overflow: hidden;
  transform-origin: 50%;

  img {
    display: block;
    inline-size: 100%;
    block-size: 100%;
    aspect-ratio: none;
    object-fit: contain;
    filter: drop-shadow(0 2px 2px #000);
  }

  &, &::backdrop {
    transition: all 0.3s ease-in-out;
    transition-behavior: allow-discrete;
  }

  &[open] {

    opacity: 1;
    transform: scale(1);

    @starting-style {
      display: block;
      opacity: 0.5;
      transform: scaleX(0.5) scaleY(0.2);
    }

    &::backdrop {
      background-color: rgba(0,0,0,0.7);
      backdrop-filter: blur(3px);

      @starting-style {
        background-color: rgba(0,0,0,0);
        backdrop-filter: blur(0);
      }

    }

  }

  &:not([open]) {
    display: none;
    opacity: 0;
    transform: scaleX(0.5) scaleY(0.2);
  }
}

html:has(dialog[open]) {
  overflow: hidden;
}