:root {
    --sidenav-text-base: 1rem;
    --sidenav-text-lg: 1.125rem;
    --sidenav-text-scale: 0.8765;
    --sidenav-text-color: var(--text-color);
    --sidenav-link-color: var(--link-color);
    --sidenav-link-alpha: 0.75;
    --sidenav-font-weight-bold: 600;
  }
  
  .sidenav {
    display: block;
  }
  
  .sidenav summary::-webkit-details-marker {
    display: none;
  }
  
  .sidenav__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  
    font-weight: var(--sidenav-font-weight-bold);
  
    border-top: var(--border-width) solid var(--border-color);
    border-bottom: var(--border-width) solid var(--border-color);
  
    touch-action: manipulation;
  }
  
  .sidenav__toggle svg {
    align-items: center;
    width: 1rem;
    height: 1rem;
  }
  
  .sidenav summary {
    position: relative;
  
    list-style: none;
    cursor: pointer;
  }
  
  .sidenav__content {
    padding-top: 0.5rem;
    padding-left: 1.5rem;
  }
  
  .sidenav__list {
    margin: 0;
    padding-left: 0;
  
    list-style: none;
  }
  
  .sidenav__list > * + *,
  .sidenav__list + .sidenav__articles {
    margin-top: 0.5rem;
  }
  
  .sidenav__label {
    font-weight: var(--sidenav-font-weight-bold);
  }
  
  .sidenav__articles {
    display: block;
  }
  
  .sidenav__article-name {
    color: var(--sidenav-link-color);
  
    opacity: var(--sidenav-link-alpha);
  }
  
  .sidenav__article-name[aria-current='page'] {
    --sidenav-link-alpha: 1;
    text-decoration: underline;
  }
  
  .sidenav__list--main > li > sidenav-details > details > summary {
    font-size: calc(var(--sidenav-text-lg) * var(--sidenav-text-scale));
  }
  
  sidenav-details > details > summary > span {
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
  }
  
  sidenav-details > details > summary > span > svg {
    position: relative;
    top: 0.25rem;
  
    width: 1rem;
  
    transform: rotate(-90deg);
  }
  
  sidenav-details > details[open] > summary > span > svg {
    transform: rotate(0deg);
  }
  
  .sidenav__content > * + * {
    margin-top: 0.5rem;
  }
  
  sidenav-article-list {
    display: block;
  }