body {
  > header {
    position: fixed;
    top: 1.5rem;
    left: var(--page-x);
    z-index: var(--layer-header);
    line-height: 1;
    mix-blend-mode: difference;

    > a {
      --color: var(--white);
      opacity: 0.8;

      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--color);
      font-size: var(--font-size-base);
      text-decoration: none;
      text-transform: lowercase;

      &:hover {
        opacity: 1;
      }

      &:active {
        opacity: 1;
        --color: var(--orange);
      }

      > span {
        display: inline-grid;
        padding: 0.2rem 0.3rem;
        color: var(--black);
        background-color: var(--color);
        border-radius: 0.25rem;
      }

      .cube {
        --size: 0.75rem;
        animation: cube-fill 5s linear infinite alternate;
      }
    }
  }
}