/* HAN v4.3 — adaptive paper-only margin navigation.
   No layout changes below 1280px; rail hidden when paper needs the margin. */
.paper-margin-nav { display: none; }

@media screen and (min-width: 1280px) {
  .paper-margin-nav {
    position: fixed;
    top: 148px;
    left: var(--paper-nav-left, 16px);
    width: 124px;
    max-height: calc(100vh - 190px);
    overflow-y: auto;
    z-index: 8;
    box-sizing: border-box;
    font-family: Georgia, serif;
    color: #566272;
    scrollbar-width: thin;
  }

  .paper-margin-nav[data-paper-nav-ready] { display: block; }

  .paper-margin-nav__label {
    margin: 0 0 16px 9px;
    font-family: Georgia, serif;
    font-size: 10px;
    line-height: 1.5;
    font-weight: 400;
    letter-spacing: .105em;
    text-transform: uppercase;
    color: #6f7988;
  }

  .paper-margin-nav__list {
    margin: 0;
    padding: 0;
    list-style: none;
    border-left: 1px solid #cbd2db;
  }

  .paper-margin-nav__link {
    display: block;
    padding: 7px 7px 7px 11px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    color: #677180;
    font-size: 12px;
    line-height: 1.45;
    font-weight: 400;
    text-decoration: none;
    transition: color 170ms ease, border-color 170ms ease;
  }

  .paper-margin-nav__link:hover,
  .paper-margin-nav__link:focus-visible {
    color: #0B1F3A;
  }

  .paper-margin-nav__link[aria-current="location"] {
    color: #0B1F3A;
    border-left-color: #344f69;
  }

  .paper-margin-nav__link:focus-visible {
    outline: 1px solid #566a80;
    outline-offset: 2px;
  }

  #paper-overview,
  #paper-abstract,
  #paper-publication,
  [id^="paper-section-"] {
    scroll-margin-top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .paper-margin-nav__link { transition: none; }
}