<p>根据你的操作系统的设定来 <mark>switch between light and dark mode</mark>.</p>

:root {
  --primary-color: #333;
  --primary-background: #e4e4e4;
  --highlight-color: hotpink;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #fafafa;
    --primary-background: #121212;
    --highlight-color: lime;
  }
}

body {
  color: var(--primary-color);
  background-color: var(--primary-background);
}

mark {
  background: var(--highlight-color);
}

@layer reset {
  *,
  *:after,
  *:before {
    box-sizing: border-box;
  }

  html,
  body {
    margin: 0;
    padding: 0;
  }

  ul[class] {
    list-style: none;
  }

  label {
    cursor: pointer;
    max-width: max-content;
    user-select: none;
  }
}

@layer baselayout {
  html {
    margin: auto;
    line-height: 1.5;
    font-size: 24px;
    font-family: "Syne", sans-serif;
    height: 100%;
    background: white;
  }

  body {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    min-height: 100dvh;
    padding: 2em;
    display: grid;
    place-content: center;
  }

  footer {
    text-align: center;
    font-style: italic;
    margin-top: 2rem;
  }

  h1,
  h2,
  summary {
    font-family: "Anybody", sans-serif;

    text-decoration: underline;
    text-decoration-color: hsl(156deg 100% 50% / 50%);
    text-decoration-thickness: 0.2rem;
    text-decoration-style: wavy;
    text-decoration-skip-ink: none;
  }

  h2 {
    margin: 2em 0 0.5em 0;
    text-wrap: balance;
  }

  a {
    color: inherit;
  }

  button,
  input,
  textarea {
    font-family: inherit;
    font-size: inherit;
  }
}

@layer components {
  @layer button {
    button {
      padding: 0.2em 0.4em;
      border-width: 2px;
      border-radius: 0.25em;
      text-transform: uppercase;
    }
  }
}

@layer utilities {
  .float-right {
    float: right;
    margin-left: 0.5em;
  }
  .float-left {
    float: left;
    margin-right: 0.5em;
  }
  *:has(> .float-right, > .float-left) {
    display: flow-root;
  }

  .row {
    display: flex;
    flex-direction: row;
  }

  .column {
    display: flex;
    flex-direction: column;
  }

  .gap {
    gap: 1rem;
  }

  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
  }
}