header {
  display: grid;
  font-family: var(--font-monospace);
  font-size: 1.125rem;
  grid-template-columns: auto auto 1fr auto;
  grid-template-areas: "heading search nav theme-toggle";
  padding: 0.75rem;
}

.logo {
  color: var(--fg0);
  display: flex;
  font-weight: 700;
  grid-area: heading;

  &:hover .logo__cursor {
    animation: 1s blink infinite;
    opacity: 1;
  }
}

.logo__chevron,
.logo__cursor {
  margin-left: 0.5rem;
}

.logo__cursor {
  opacity: 0;
}

.logo__text {
  display: none;
}

@media (--md) {
  .logo__text {
    display: block;
  }
}

/*! purgecss start ignore */

.search {
  display: flex;
  grid-area: search;
  margin: 0 1rem;
}

#search__text {
  border: 1px solid var(--bg2);
  border-radius: 0.2rem;
  background: var(--bg2);
  caret-color: var(--fg);
  color: var(--fg);
  outline: none;
  padding: 0 0.5rem;
  width: 100%;

  &:hover {
    border-color: var(--bg3);
  }

  &:focus {
    border-color: var(--bg4);
  }

  &::placeholder {
    color: var(--fg1);
  }

  &[type="search"]::-webkit-search-cancel-button {
    appearance: none;
  }
}

#search__suggestions {
  background: var(--bg);
  border-radius: 0.2rem;
  box-shadow: 0 0.5rem 1rem var(--bg1);
  font-family: var(--font-serif);
  left: 0;
  margin-top: 2rem;
  position: absolute;
  width: 95vw;
  z-index: 1000;
}

@media (--md) {
  .search {
    position: relative;
  }

  #search__suggestions {
    width: 60vw;
  }
}

.search__suggestions--hidden {
  display: none;
}

.search__suggestion-item {
  border-bottom: 1px dashed var(--bg2);
  display: grid;
  grid-template-columns: 1fr 2fr;

  &:focus,
  &:focus-visible,
  &:hover {
    background: var(--bg1);
    cursor: pointer;
    outline: none;
  }

  &:last-child {
    border: none;
  }
}

.search__suggestion-title,
.search__suggestion-description {
  padding: 0 1rem;
  margin: 1rem 0;
}

.search__suggestion-title {
  font-weight: 700;
}

.search__suggestion-description {
  border-left: 1px solid var(--bg2);
}

.search__no-results {
  padding: 0.75rem;
}

/*! purgecss end ignore */

.theme__toggle {
  align-items: center;
  background: none;
  border: none;
  color: var(--yellow1);
  cursor: pointer;
  display: flex;
  grid-area: theme-toggle;
  margin: 0 1rem;

  &:hover {
    color: var(--yellow2);
  }

  & svg {
    height: 28px;
    width: 28px;
  }
}

/* TODO: simplify deep nesting */
nav#menu {
  align-items: center;
  display: flex;
  grid-area: nav;
  justify-content: flex-end;

  & .menu__item {
    color: var(--fg);

    &:hover {
      color: var(--fg3);
      cursor: pointer;
    }
  }

  & ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  & ul.menu--horizontal {
    align-items: center;
    display: none;

    & li {
      display: inline-block;
      margin: 0 0.75rem;
    }

    @media (--md) {
      display: flex;
    }
  }

  & ul.menu--vertical {
    background: var(--bg1);
    bottom: 0;
    margin: 0;
    padding: 3rem;
    position: fixed;
    right: 0;
    top: 0;
    transform: translate(100%, 0);
    transition: transform 0.5s cubic-bezier(0.9, 0, 0.1, 1);
    width: 50%;
    z-index: 10;

    & .menu__item {
      color: var(--fg1);

      &:hover {
        color: var(--fg3);
      }
    }
  }

  & .menu__burger {
    display: flex;
    height: 24px;
    width: 24px;

    & > * {
      position: absolute;
    }

    & svg {
      width: inherit;
      z-index: 20;
      height: inherit;

      & line {
        transition-duration: 0.5s;
        transition-property: stroke, opacity, transform;
        transition-timing-function: cubic-bezier(0.9, 0, 0.1, 1);
      }

      & line:nth-of-type(1) {
        transform-origin: center 6px;
      }

      & line:nth-of-type(2) {
        transform-origin: center 12px;
      }

      & line:nth-of-type(3) {
        transform-origin: center 18px;
      }
    }

    & input {
      height: inherit;
      opacity: 0;
      width: inherit;
      z-index: 30;

      &:checked {
        & ~ ul.menu--vertical {
          transform: none;
        }

        & ~ svg {
          stroke: var(--fg1);

          & line:nth-of-type(1) {
            transform: translate(0, 6px) rotate(45deg);
          }

          & line:nth-of-type(2) {
            opacity: 0;
            transform: scale(0.2);
          }

          & line:nth-of-type(3) {
            transform: translate(0, -6px) rotate(-45deg);
          }
        }
      }
    }

    @media (--md) {
      display: none;
    }
  }
}
