/* ============================================================
   Tsinglan Wiki — Table of Contents (sticky sidebar)
   --------------------------------------------------------------
   Pair with:
     - wiki/layout.html  (#wiki-toc + #main-content)
     - static/js/toc.js  (auto-builds links from h2 / h3)

   Desktop (≥992px): full-height left rail (collapses to a thin strip).
   Mobile  (<992px): same markup becomes a left drawer, opened by a FAB.

   Opt out on a page:
     {% block body_class %}no-toc{% endblock %}
   Homepage is skipped automatically (body.page-home).
   ============================================================ */

/* Headings jump below the fixed navbar instead of hiding under it. */
#main-content h2,
#main-content h3,
#main-content h4 {
  scroll-margin-top: 5.5rem;
}

/* ----- Shell: two columns only after JS finds headings ----- */

.page-shell {
  position: relative;
}

@media (min-width: 992px) {
  body.has-wiki-toc {
    --wiki-toc-width: 16.5rem;
    padding-left: var(--wiki-toc-width);
    transition: padding-left 0.28s ease, background-color 0.35s ease, color 0.35s ease;
  }

  body.has-wiki-toc.wiki-toc-collapsed {
    --wiki-toc-width: 3.25rem;
  }

  /* Article stays a single column; the rail is fixed to the viewport edge. */
  .site-main .container.page-shell--with-toc,
  .site-main .container.page-shell--with-toc.page-shell--toc-collapsed {
    display: block;
    max-width: 1080px;
  }
}

/* ----- Sidebar / drawer panel ----- */

.wiki-toc {
  display: none;
}

.page-shell--with-toc .wiki-toc {
  display: block;
}

.wiki-toc__panel {
  background-color: var(--cream);
  border-radius: 0.65rem;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.wiki-toc__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.62rem 0.85rem;
  background-color: var(--navy);
  color: var(--cream);
}

.wiki-toc__title {
  margin: 0;
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
}

.wiki-toc__chips {
  display: flex;
  gap: 0.28rem;
  flex-shrink: 0;
}

.wiki-toc__chip {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: linear-gradient(135deg, #9eb8c9, #6f8799);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.wiki-toc__chip--alt {
  background: linear-gradient(135deg, #b8b8b8, #8a8a8a);
}

.wiki-toc__rail-label {
  display: none;
}

.wiki-toc__collapse {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(232, 213, 154, 0.45);
  border-radius: 50%;
  background: transparent;
  color: var(--cream);
  cursor: pointer;
  flex-shrink: 0;
}

.wiki-toc__collapse:hover,
.wiki-toc__collapse:focus-visible {
  background-color: rgba(255, 255, 255, 0.12);
  outline: 2px solid var(--cream);
  outline-offset: 2px;
}

.wiki-toc__collapse-icon {
  width: 1.15rem;
  height: 1.15rem;
  transition: transform 0.22s ease;
}

.wiki-toc__close {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(232, 213, 154, 0.45);
  border-radius: 0.35rem;
  background: transparent;
  color: var(--cream);
  cursor: pointer;
}

.wiki-toc__close:hover,
.wiki-toc__close:focus-visible {
  background-color: rgba(255, 255, 255, 0.12);
  outline: 2px solid var(--cream);
  outline-offset: 2px;
}

.wiki-toc__close svg {
  width: 1rem;
  height: 1rem;
}

.wiki-toc__nav {
  padding: 0.7rem 0.55rem 0.85rem;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.wiki-toc__list,
.wiki-toc__list ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Nested h3 items indent under their parent h2. */
.wiki-toc__list ul {
  margin: 0.15rem 0 0.35rem 0.7rem;
  padding-left: 0.55rem;
  border-left: 2px solid rgba(31, 66, 107, 0.16);
}

.wiki-toc__list > li + li {
  margin-top: 0.12rem;
}

.wiki-toc__link {
  display: block;
  padding: 0.32rem 0.55rem;
  border-radius: 0.35rem;
  border-left: 3px solid transparent;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, font-weight 0.18s ease;
}

.wiki-toc__link:hover,
.wiki-toc__link:focus-visible {
  color: var(--navy);
  background-color: rgba(31, 66, 107, 0.08);
  outline: none;
}

.wiki-toc__link.is-active {
  color: var(--navy);
  font-weight: 700;
  background-color: rgba(233, 185, 26, 0.22);
  border-left-color: var(--mustard);
}

.wiki-toc__link.is-ancestor {
  color: var(--navy);
  font-weight: 600;
}

.wiki-toc__link--h3 {
  font-size: 0.82rem;
  padding: 0.22rem 0.45rem;
}

/* Desktop: full-height rail along the left edge, below the navbar. */
@media (min-width: 992px) {
  .page-shell--with-toc .wiki-toc {
    position: fixed;
    top: 64px;
    left: 0;
    bottom: 0;
    z-index: 20;
    width: var(--wiki-toc-width, 16.5rem);
    max-height: none;
    align-self: auto;
    transition: width 0.28s ease;
  }

  .wiki-toc__panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: none;
    border-radius: 0;
    box-shadow: none;
    background-color: var(--navy);
  }

  .wiki-toc__bar {
    padding: 1.15rem 1rem 0.85rem 1.15rem;
  }

  .wiki-toc__title {
    font-size: 1.28rem;
    letter-spacing: 0.02em;
    text-transform: none;
  }

  .wiki-toc__nav {
    flex: 1 1 auto;
    max-height: none;
    padding: 0.35rem 0.75rem 1.25rem 0.85rem;
  }

  .wiki-toc__list ul {
    border-left-color: rgba(232, 213, 154, 0.28);
  }

  .wiki-toc__link {
    color: rgba(232, 213, 154, 0.82);
  }

  .wiki-toc__link:hover,
  .wiki-toc__link:focus-visible {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
  }

  .wiki-toc__link.is-active {
    color: var(--cream);
    background-color: rgba(233, 185, 26, 0.28);
    border-left-color: var(--mustard);
  }

  .wiki-toc__link.is-ancestor {
    color: var(--cream);
  }

  .wiki-toc-fab,
  .wiki-toc-backdrop {
    display: none !important;
  }

  .wiki-toc__collapse {
    display: inline-flex;
  }

  /* Collapsed: still a full-height strip, not a short card. */
  .page-shell--toc-collapsed .wiki-toc__panel {
    position: relative;
    min-height: 0;
    max-height: none;
    height: 100%;
  }

  .page-shell--toc-collapsed .wiki-toc__bar {
    position: relative;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: 1.1rem;
    min-height: 100%;
    height: 100%;
    padding: 1.15rem 0.15rem 1rem;
  }

  .page-shell--toc-collapsed .wiki-toc__title,
  .page-shell--toc-collapsed .wiki-toc__chips,
  .page-shell--toc-collapsed .wiki-toc__nav {
    display: none;
  }

  .page-shell--toc-collapsed .wiki-toc__rail-label {
    display: block;
    margin-top: 2.4rem;
    font-family: var(--font-nav);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--cream);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    pointer-events: none;
  }

  .page-shell--toc-collapsed .wiki-toc__collapse {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 0;
    z-index: 1;
  }

  .page-shell--toc-collapsed .wiki-toc__collapse-icon {
    position: absolute;
    top: 1.1rem;
    left: 50%;
    width: 1.15rem;
    height: 1.15rem;
    margin-left: -0.57rem;
    transform: scaleX(-1);
  }

  .page-shell--toc-collapsed .wiki-toc__collapse:hover,
  .page-shell--toc-collapsed .wiki-toc__collapse:focus-visible {
    background-color: rgba(255, 255, 255, 0.08);
  }
}

/* ----- Mobile / tablet: drawer + floating Contents button ----- */

.wiki-toc-fab {
  display: none;
}

.wiki-toc-backdrop {
  display: none;
}

@media (max-width: 991.98px) {
  .page-shell--with-toc .wiki-toc {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1090;
    width: min(20.5rem, 88vw);
    max-height: none;
    padding: 4.15rem 0.7rem 0.75rem;
    background: transparent;
    transform: translateX(-105%);
    transition: transform 0.28s ease;
    pointer-events: none;
  }

  .page-shell--with-toc .wiki-toc.is-open {
    transform: translateX(0);
    pointer-events: auto;
  }

  .wiki-toc__panel {
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--cream);
    border: 2px solid var(--navy);
    box-shadow: 8px 8px 0 0 var(--navy);
  }

  .wiki-toc__nav {
    flex: 1 1 auto;
    max-height: none;
    background-color: var(--cream);
  }

  .wiki-toc__close {
    display: inline-flex;
  }

  .wiki-toc__collapse,
  .wiki-toc__rail-label {
    display: none !important;
  }

  .wiki-toc__chips {
    display: none;
  }

  /* Sit above the travelling logo (bottom-left), away from the hero title. */
  .wiki-toc-fab {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    position: fixed;
    top: auto;
    bottom: 7.5rem;
    left: 0.75rem;
    z-index: 1045;
    padding: 0.42rem 0.75rem 0.42rem 0.55rem;
    border: 2px solid var(--navy);
    border-radius: 999px;
    background-color: var(--cream);
    color: var(--navy);
    font-family: var(--font-nav);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    box-shadow: 4px 4px 0 0 var(--navy);
    cursor: pointer;
  }

  body.wiki-toc-lock .wiki-toc-fab {
    visibility: hidden;
  }

  .wiki-toc-fab[hidden] {
    display: none !important;
  }

  .wiki-toc-fab:hover,
  .wiki-toc-fab:focus-visible {
    transform: translate(-1px, -1px);
    box-shadow: 5px 5px 0 0 var(--navy);
    outline: 2px solid var(--mustard);
    outline-offset: 3px;
  }

  .wiki-toc-fab svg {
    width: 1.05rem;
    height: 1.05rem;
  }

  .wiki-toc-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1085;
    background-color: rgba(26, 51, 82, 0.55);
  }

  .wiki-toc-backdrop[hidden] {
    display: none !important;
  }

  .wiki-toc-backdrop:not([hidden]) {
    display: block;
  }

  body.wiki-toc-lock {
    overflow: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wiki-toc,
  .wiki-toc__link,
  .wiki-toc-fab,
  .wiki-toc__collapse-icon,
  .page-shell--with-toc {
    transition: none !important;
  }
}