/* ═══════════════════════════════════════════════════════════════════════════
   TOC — "On this page" sidebar (desktop) + floating dialog (mobile)
   Activated via `toc: true` in post frontmatter.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Desktop sidebar ──────────────────────────────────────────────────────── */

.toc-sidebar {
  position: fixed;
  top: calc(var(--header-h, 56px) + var(--header-gap, 48px) + 30px);
  /* +30px matches Minima's .page-content { padding: 30px 0 }, so the TOC
     starts at the same vertical position as the post title. */
  /* Align left edge just right of the centered 740px content column.
     Content right edge = 50vw + 370px (half of 740px). Add 20px gap. */
  left: calc(50% + 370px + 20px);
  width: 220px;
  max-height: calc(100vh - var(--header-h, 56px) - var(--header-gap, 48px) - 46px);
  /* -46px = -30px (page-content top padding, so TOC top aligns with title)
              -16px (bottom breathing room above viewport edge) */
  overflow-y: auto;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0 10px;
  font-size: 0.875rem;
  line-height: 1.4;
  z-index: 100; /* below the fixed site-header (z-index 500) and mobile toggle (200) */
  display: none;
  scrollbar-width: thin;
  scrollbar-color: #d1d5db transparent;
}

/* Show sidebar only when viewport is wide enough that the TOC right edge
   (50vw + 370 + 20 + 220 = 50vw + 610) fits without overflow: vw ≥ 1240px. */
@media (min-width: 1240px) {
  .toc-sidebar {
    display: block;
  }
}

.toc-sidebar__title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #6b7280;
  margin: 0 0 8px 0;
  padding-bottom: 6px;
  border-bottom: 1px solid #e5e7eb;
}
/* Make the title a back-to-top link that inherits the heading style */
.toc-sidebar__title-link {
  color: inherit;
  text-decoration: none;
}
.toc-sidebar__title-link:hover {
  color: #374151;
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

/* ── Shared link list styles (used in both sidebar and dialog) ────────────── */

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

/* ── Collapsible children ─────────────────────────────────────────────────── */

/* Children lists are hidden by default and shown when their parent is active */
.toc-children {
  display: none;
  margin-top: 2px;
  margin-bottom: 2px;
}

.toc-children--open {
  display: block;
}

.toc-list li {
  margin: 0;
  padding: 0;
}

.toc-sidebar .toc-link,
.toc-dialog .toc-link {
  display: block;
  padding: 3px 6px;
  color: #4b5563;
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 3px 3px 0;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  line-height: 1.35;
  margin-bottom: 1px;
  outline: none;
  -webkit-tap-highlight-color: transparent; /* suppress iOS blue flash on tap */
}
.toc-sidebar .toc-link:visited,
.toc-dialog .toc-link:visited {
  color: #4b5563;
}

/* Depth indentation */
.toc-link[data-depth="0"] { padding-left: 6px;  font-weight: 500; }
.toc-link[data-depth="1"] { padding-left: 14px; }
.toc-link[data-depth="2"] { padding-left: 22px; font-size: 0.8rem; color: #6b7280; }

.toc-sidebar .toc-link:hover,
.toc-dialog .toc-link:hover {
  color: #111827;
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.toc-sidebar .toc-link.is-active,
.toc-dialog .toc-link.is-active {
  color: #0f766e;
  font-weight: 600;
  border-left-color: #0f766e;
}

/* ── Mobile floating toggle button ───────────────────────────────────────── */

.toc-toggle {
  display: none;           /* hidden on desktop */
  position: fixed;
  bottom: 24px;
  right: 20px;
  z-index: 200;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  background: #111827;
  color: #ffffff;
  border: none;
  border-radius: 24px; /* large value produces a pill shape regardless of button height */
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  -webkit-tap-highlight-color: transparent; /* suppress iOS blue flash on tap */
}

/* Show the floating button on viewports too narrow for the sidebar */
@media (max-width: 1239px) {
  .toc-toggle {
    display: flex;
  }
}

/* ── Mobile <dialog> panel ───────────────────────────────────────────────── */

dialog.toc-dialog {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  top: auto;
  width: 100%;
  max-width: 100%;
  max-height: 65vh;
  margin: 0;
  padding: 0;
  border: none;
  border-top-left-radius: 14px;
  border-top-right-radius: 14px;
  overflow: hidden;
  box-shadow: 0 -4px 32px rgba(0, 0, 0, 0.18);
}

dialog.toc-dialog[open] {
  animation: toc-slide-up 0.22s ease-out;
}

@keyframes toc-slide-up {
  from { transform: translateY(100%); opacity: 0.6; }
  to   { transform: translateY(0);    opacity: 1;   }
}

dialog.toc-dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.toc-dialog__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px 10px;
  border-bottom: 1px solid #e5e7eb;
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 1;
}

.toc-dialog__title {
  font-weight: 700;
  font-size: 0.9rem;
  color: #111827;
  margin: 0;
}

.toc-dialog__close {
  background: none;
  border: none;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  color: #6b7280;
  padding: 2px 6px;
  border-radius: 4px;
}

.toc-dialog__close:hover {
  color: #111827;
  background: #f3f4f6;
}

/* Scrollable list area inside dialog.
   52px = dialog header height (title + padding + border). */
.toc-dialog .toc-list-wrap {
  overflow-y: auto;
  max-height: calc(65vh - 52px);
  padding: 8px 8px 24px;
}

/* Slightly larger tap targets inside dialog */
.toc-dialog .toc-link {
  padding-top: 5px;
  padding-bottom: 5px;
}