@import url('../../../assets/styles/colours.css');

:root {
  --_g_text-width: 75ch;
  --_g_screen-min-width: 960px;
  --_g_menu-slide-transition: none;
  @media screen and (prefers-reduced-motion: no-preference) {
    --_g_menu-slide-transition: translate 250ms ease-out;
  }
  --_g_burger-width: 7rem;
  --_g_burger-height: 6rem;
  --_g_logo-height: 20rem;
  --_g_header-padding-bottom: 2rem;
  --_g_header-margin-top: 2rem;

  font-size: 10px;
}

html {
  margin: 0;
  padding: 0;
  @media screen and (prefers-reduced-motion: no-preference) {
    scroll-behavior: smooth;
  }
}
body {
  --body-padding-x: 4ch;
  --body-padding-y: 0;
  font-size: 10px;

  margin: 0;
  padding: var(--body-padding-y) var(--body-padding-x);
  font-size: 1.2rem;
  font-family: -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui,
    helvetica neue, helvetica, Ubuntu, roboto, noto, arial, sans-serif;
  display: grid;
  grid-template-columns: 1fr;
  overflow: auto;
  color: var(--bb-dark);
  background-color: var(--bb-light);

  &:has(#menu-toggle:checked) {
    overflow: hidden;
  }

  @media screen and (min-width: 960px) {
    grid-template-columns: 3fr 8fr 1fr;
    padding: 0;
    column-gap: 2ch;

    &:has(#menu-toggle:checked) {
      overflow: auto;
    }
  }
}

body, body * {
  box-sizing: border-box;
}

header {
  --padding-top: var(--_g_header-margin-top);
  --padding-bottom: var(--_g_header-padding-bottom);

  padding-top: var(--padding-top);

  & a.skip-link {
    display: inline-block;
    font-size: 2.5rem;
    margin-top: calc(var(--_g_burger-height) / 2);
    margin-left: calc(var(--_g_burger-width) + 1ch);
    outline-offset: 0.5em;
  }
  & h1 {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    text-align: center;
    max-width: 65ch;
  }

  @media screen and (min-width: 960px) {
    padding-bottom: var(--padding-bottom);
    grid-column: 1/-1;
    box-shadow: 0.5rem 0.5rem 1.5rem var(--bb-dark--50);
    z-index: 100;
  }
}

#menu-toggle {
  appearance: none;
  position: fixed;
  top: 0;
  top: calc(var(--_g_burger-height) / 4);
  right: 0;
  right: calc(var(--_g_burger-height) / 4);
  translate: calc(110vw + (var(--_g_burger-width) / 4));
  translate: 50vw;
  translate: 0;
  translate: calc((-100vw) + (var(--_g_burger-width) * 1.6));
  outline-offset: 0;
  border-radius: 6px;
  height: var(--_g_burger-height);
  width:  var(--_g_burger-width);
  cursor: pointer;
  background-image: url('../../../assets/images/ui/menuButtonBurger.svg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: auto;
  padding: 0;
  margin: 0;

  &:is(:hover, :focus) {
    transition: var(--_g_menu-slide-transition);
    outline: 0.25em solid var(--bb-purple);
  }

  &:checked {
    opacity: 1;
    translate: calc(100vw - (var(--_g_burger-width) + 1.25rem));
    translate: 0;
    transition: var(--_g_menu-slide-transition);

    background-image: url('../../../assets/images/ui/menuButtonArrow.svg');
    z-index: 100;
  }

  @media screen and (min-width: 960px){
    display: none;
  }
}
& label[for=menu-toggle] {
  @media screen and (min-width: 960px){
    display: none;
  }
}
nav {
  position: fixed;
  background-color: var(--bb-light);
  min-width: 100vw;
  height: 100dvh;
  translate: -110%;
  transition: var(--_g_menu-slide-transition);
  /* position nav outside of body padding */
  margin-left: calc(0ch - var(--body-padding-x));
  overflow: auto;

  &#main-menu:has(menu) {
    padding: 1ch;

    & menu {
      list-style: none;
    }
    --_max-height: calc(100dvh - (var(--_g_header-padding-bottom) + var(--_g_header-margin-top) + 13.78em));
    @media screen and (min-width: 960px) {
      --max-height: calc(var(--_max-height) - (var(--_g_logo-height) * 0.69));
      grid-column: 1/2;
      grid-row-start: 2;
      padding: 0;
      overflow: auto;
      margin: 0;
      top: 0.02px;
      translate: 0;
      position: sticky;
      min-width: unset;
      min-height: unset;
      max-height: var(--max-height);
      height: unset;
      align-self: start;
    }
    @media screen and (min-width: 1156px) {
      --max-height: calc(var(--_max-height) - (var(--_g_logo-height) * 0.35));

      max-height: var(--max-height);
    }
    @media screen and (min-width: 1307px) {
      --max-height: var(--_max-height);
      max-height: var(--max-height);
    }
  }

  & menu {
    --_menu-font-size: 2.75rem;
    margin: 0;
    font-size: var(--_menu-font-size);
    padding-inline: 0;
    & li {
      margin-inline-start: 0;
      margin-left: 0;

      &:not(menu menu li) {
        padding: 0.5em 0 0.5em;
        &:not(:last-of-type) {
          border-bottom: 2px solid var(--bb-dark--50);
        }
      }
    }
    & a {
      display: block;
      color: var(--bb-dark);
      color: inherit;
      text-decoration: none;
      padding-left: 1ch;
      &:hover { background-color: var(--bb-blue); }

    }
    &#site-menu {
      font-size: calc(var(--_menu-font-size) * 0.75);
      border-bottom: 0.2em double var(--bb-dark);
      & li {
        border: none;
        padding: 0.5em 0 0;

        &:last-child {
          padding-bottom: 0.5em;
        }
      }
    }
    & menu {
      & li {
        font-size: 0.9em;
        & a {
          padding-left: 2ch;
          &::before {
            content: "- ";
          }
        }
      }
    }
  }
}

input[type="checkbox"]#menu-toggle:checked + nav#main-menu {
  translate: 0;
}

main {
  & article {
    --_g_text-width: 65ch;
  }

  @media screen and (min-width: 960px) {
    grid-column: 2/-2;
  }
}

h1 {
  font-size: 6rem;
  font-weight: 900;
  margin: 0;
  color: var(--bb-purple);
  text-wrap: balance;

  & + p {
    font-size: 4.5rem;
    font-weight: 700;
    color: var(--bb-purple);
  }
}

h2, h3, h4, h5 {
  margin: 1em auto 0;
}

h2 {
  --text-width: calc(var(--_g_text-width) * 0.58);

  font-size: 4.5rem;
  max-width: var(--text-width);
}
h3 {
  --text-width: calc(var(--_g_text-width) * 0.75 );

  font-size: 3.5rem;
  max-width: var(--text-width);
}
h4 {
  --text-width: calc(var(--_g_text-width) * 0.85);

  font-size: 3.1rem;
  max-width: var(--text-width);
}
h5 {
  --text-width: calc(var(--_g_text-width) * 0.95);

  font-size: 2.75rem;
  max-width: var(--text-width);
}

h2, h3, h4, h5, h6 {
  & a {
    font-size: 0.6em;

    &.header-link {
      text-decoration: none;

      &:is(:hover, :focus)::after {
        content: " 📋";
      }
    }
  }
}

.logo {
  --logo-height: var(--_g_logo-height);

  width: var(--logo-height, 20rem);
  margin-top: -10rem;
  margin-bottom: 2rem;
}

p, ul, menu, ol {
  font-size: 2.6rem;
  line-height: 2;
}

p, ul, ol {
  --text-width: var(--_g_text-width);

  line-height: 1.6;
  margin: 1rem auto 0;
  max-width: var(--text-width);
}

ol.alpha-list {
  list-style-type: lower-alpha;
}

article:last-of-type {
  padding-bottom: 50vh;
}

.visually-hidden,
.visually-hidden-focusable:not(:focus):not(:focus-within) {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}