/* Header inside .app */
.app {
  #header {
    margin-bottom: 2.5em;
    background: var(--color-header-bg);
    top: 0;
    position: sticky;
    opacity: 0.85;
    box-shadow: 0 1em 2em -1em var(--color-header-bg);
    transition: opacity 0.25s;

    &:hover {
      opacity: 1;
    }

    .header_bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.5em;
      margin: 0 auto;
      max-width: 800px;
    }

    @media (max-width: var(--breakpoint-mobile)) {
      margin-bottom: 1em;
    }

    .logo {
      margin: initial;
      width: 3em;
      height: 3em;

      a {
        display: inline-block;
        width: 3em;
        height: 3em;
        border-radius: 50%;
        filter: invert(1);
        cursor: pointer;
        box-sizing: border-box;
        padding: 0.25em;
        transition: background 0.25s;

        &:hover {
          background: rgba(255, 255, 255, 0.25);
        }
      }
    }

    .tagline {
      display: flex;
      align-items: center;
      text-align: center;
      font-size: 1em;
      margin: 0.5em;
      color: white;
      text-shadow: initial;

      strong {
        padding-left: 0.25em;
      }

      @media (max-width: var(--breakpoint-mobile)) {
        font-size: 1em;
      }
    }
  }
}