.sidebar {
  position: fixed;
  top: 0;
  left: 0;

  width: 260px;
  height: 100vh;

  background-color: var(--main-contrast-color);
  color: var(--main-text-color);

  box-shadow: 2px 0 8px rgba(0,0,0,0.2);

  padding: 0 0.5em;

  transform: translateX(-100%);
  transition: transform 0.3s ease;

  z-index: 101;

  overflow: scroll;
}

#sidebar-toggle:checked ~ .sidebar {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  flex-direction: row;
  justify-content: start;
  align-items: center;
  gap: 0.5em;

  border-bottom: 2px solid var(--main-text-color);
}

.sidebar-header-element {
  height: 3em;

  align-content: center;

  margin: 0;

  font-family: var(--font-family-emph);

  &:first-child {
    font-size: x-large;
  }

  &:nth-child(2) {
    flex: 1;
  }
}

.sidebar-header-img {
  height: inherit;
}

.sidebar-menu {
  font-size: larger;
  list-style-type: circle;
}

.sidebar-menu > li {
  padding-bottom: 0.25em;
  &::marker {
    font-size: xx-large;
  }
}

.sidebar-menu a[href="#"] {
  color: gray;

  pointer-events: none;

  text-decoration: none;
}

.sidebar-menu > li > details > summary {
  list-style: none;
  display: flex;
  align-items: center;
}

.sidebar-menu > li > details > summary::after {
  content: "▼";
  margin-left: auto; /* align icon right */
}

.sidebar-menu > li > details[open] > summary::after {
  content: "▲";
}

.sidebar-menu > li > details > menu {
  /* font-size: larger; */
  list-style-type: circle;
}

.sidebar-menu > li > details > menu > li::marker {
  font-size: xx-large;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;

  background: rgba(0,0,0,0.4);
  opacity: 0;

  pointer-events: none;

  transition: opacity 0.3s ease;

  z-index: 100;
}

#sidebar-toggle:checked ~ .sidebar-backdrop {
  opacity: 1;

  pointer-events: auto;
}