:root {
  --text: oklch(90% 0.03 25);
  --text-muted: oklch(62% 0.02 305);
  --text-main: oklch(92% 0.12 305);
  --text-accent: oklch(87% 0.14 83);
  --bg: oklch(14% 0.02 270);
  --bg-accent: oklch(28% 0.03 320);
  --highlight: oklch(94% 0.12 192);
  --sidebar-width: 260px;
  --content-max-width: 44em;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "SF Mono", Menlo, Monaco, monospace;
  font-size: 1.3em;
  line-height: 1.4;
  color: var(--text-muted);
  background: var(--bg);

  p {
    color: var(--text-main)
  }
}

a {
  color: var(--highlight);
  text-decoration: none;
}

input#t {
  display: none;
}

label[for="t"]:first-of-type {
  display: none;
}

label[for="t"]:last-of-type {
  display: none;
}

div#l {
  display: flex;
  min-height: 100vh;

  &>nav {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-accent);
    overflow-y: auto;
    position: sticky;
    top: 0;
    height: 100vh;

    &>header {
      padding: 1.25rem 1.25rem 0.75rem;
      border-bottom: 1px solid oklch(0% 0 0);

      & a {
        color: var(--text);
      }

      & h1 {
        margin: 0;
        font-size: 1.1rem;
        font-weight: 600;
        color: var(--text);
      }
    }

    &>ul {
      list-style: none;
      margin: 0;
      padding: 0.5rem 0;

      &>li>span {
        display: block;
        padding: 0.5rem 1.25rem 0.25rem;
        font-size: 0.7rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--text-muted);
      }

      & a {
        display: block;
        padding: 0.35rem 1.25rem;
        color: var(--text-muted);
        font-size: 0.9rem;
        border: 1px solid transparent;

        &:hover {
          color: var(--text);
          background: var(--bg);
          border-color: var(--highlight);
        }

        &[aria-current="page"] {
          color: var(--text-accent);
          font-weight: 600;
          background: color-mix(in oklch, var(--text-accent) 10%, transparent);
        }
      }
    }
  }

  &>main {
    flex: 1;
    max-width: var(--content-max-width);
    padding: 2.5rem 3rem;
    margin: 0 auto;

    & h2,
    & h3,
    & h4 {
      font-weight: 600;
      color: var(--text);
      margin-top: 1.5em;
      margin-bottom: 0.5em;
    }

    & a:hover {
      border: 1px solid var(--highlight);
    }
  }
}

@media (width <=768px) {
  label[for="t"]:first-of-type {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 200;
    width: 44px;
    height: 44px;
    cursor: pointer;
    background: var(--bg-accent);
    border-bottom-right-radius: 6px;
    font-size: 1.25rem;
    color: var(--text);
    line-height: 1;

    &::before {
      content: "\2630";
    }
  }

  div#l {
    &>nav {
      position: fixed;
      left: 0;
      top: 0;
      height: 100vh;
      z-index: 150;
      min-width: unset;
      transform: translateX(-100%);
      transition: transform 0.25s ease;

      &>header {
        padding-top: 3.25rem;
      }
    }

    &>main {
      padding: 1.5rem 1.25rem;
      padding-top: 3.5rem;
    }
  }

  input#t:checked~div#l>nav {
    transform: translateX(0);
  }

  label[for="t"]:last-of-type {
    position: fixed;
    inset: 0;
    background: oklch(0% 0 0 / 0.4);
    z-index: 140;
    cursor: pointer;
  }

  input#t:checked~label[for="t"]:last-of-type {
    display: block;
  }
}