/* ============================================================
   toc.css
   Floating and sidebar table of contents for Firefly Hexo theme
   ============================================================ */

/* ---- TOC Widget Container — M3 surface ---- */
.toc-widget {
  background: var(--card-bg);
  border-radius: var(--md-shape-corner-large);
  border: 1px solid var(--line-divider);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.toc-widget .toc-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem 0.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  position: relative;
}
.toc-widget .toc-header::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 0.875rem;
  background: var(--primary);
  border-radius: 2px;
  flex-shrink: 0;
}

.toc-widget .toc-body {
  padding: 0.625rem 0;
  counter-reset: toc-counter;
}

/* ---- TOC List ---- */
.toc-widget .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-widget .toc-item {
  counter-increment: toc-counter;
  padding: 0.1875rem 0.75rem;
  transition: all 0.2s ease;
  position: relative;
}

.toc-widget .toc-item a {
  display: flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  border-radius: var(--md-shape-corner-full);
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.4;
  transition:
    background-color var(--md-motion-duration-short) var(--md-motion-easing-standard),
    color var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

/* Auto-numbering circle badge prefix */
.toc-widget .toc-item a::before {
  content: counter(toc-counter);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  margin-right: 0.625rem;
  flex-shrink: 0;
  transition:
    background-color var(--md-motion-duration-short) var(--md-motion-easing-standard),
    color var(--md-motion-duration-short) var(--md-motion-easing-standard);
}

/* Hover State */
.toc-widget .toc-item a:hover {
  background: var(--md-sys-color-surface-variant);
  color: var(--text-primary);
}
.toc-widget .toc-item a:hover::before {
  filter: brightness(0.85);
}

/* Active State */
.toc-widget .toc-item.active a {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: 600;
}
.toc-widget .toc-item.active a::before {
  filter: brightness(0.85);
}

/* ---- TOC Nesting Levels ---- */
.toc-widget .toc-level-2 { padding-left: 1.25rem; }
.toc-widget .toc-level-3 { padding-left: 2rem; }
.toc-widget .toc-level-4 { padding-left: 2.75rem; }
.toc-widget .toc-level-5 { padding-left: 3.5rem; }
.toc-widget .toc-level-6 { padding-left: 4.25rem; }

/* ---- Sidebar TOC (legacy class name support) ---- */
.sidebar-toc {
  font-size: 0.875rem;
}
.sidebar-toc .toc-item {
  padding: 0.25rem 0;
  border-left: 2px solid transparent;
  padding-left: 1rem;
  transition: all var(--duration-fast);
}
.sidebar-toc .toc-item.active {
  border-left-color: var(--primary);
  color: var(--primary);
}
.sidebar-toc .toc-item a {
  color: var(--text-secondary);
  display: block;
  transition: color var(--duration-fast);
}
.sidebar-toc .toc-item a:hover { color: var(--primary); }
.sidebar-toc .toc-item.active a { color: var(--primary); font-weight: 500; }

.sidebar-toc .toc-level-2 { padding-left: 1rem; }
.sidebar-toc .toc-level-3 { padding-left: 1.75rem; }
.sidebar-toc .toc-level-4 { padding-left: 2.5rem; }

/* ---- Floating TOC Button (mobile) — M3 FAB ---- */
.floating-toc-btn {
  position: fixed;
  right: 1rem;
  bottom: 5rem;
  z-index: 30;
  width: 3rem;
  height: 3rem;
  border-radius: var(--md-shape-corner-large);
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  transition:
    filter var(--md-motion-duration-short) var(--md-motion-easing-standard);
}
.floating-toc-btn:hover { filter: brightness(0.92); }

@media (max-width: 768px) {
  .floating-toc-btn { display: flex; }
}

/* ---- Floating TOC Panel — M3 surface ---- */
.floating-toc-panel {
  position: fixed;
  right: 1rem;
  bottom: 8rem;
  max-width: 280px;
  max-height: 60vh;
  overflow-y: auto;
  padding: 1rem;
  z-index: 30;
  background: var(--card-bg);
  border-radius: var(--md-shape-corner-large);
  border: 1px solid var(--line-divider);
}
.floating-toc-panel.hidden { display: none; }

/* ---- TOC Collapsible Toggle ---- */
.toc-collapse-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  border: none;
  background: none;
  width: 100%;
}
.toc-collapse-toggle:hover { color: var(--primary); }
.toc-collapse-toggle .toggle-icon {
  transition: transform var(--duration-fast);
}
.toc-collapse-toggle.collapsed .toggle-icon { transform: rotate(-90deg); }

/* ---- TOC Highlight Bar ---- */
.toc-highlight {
  position: absolute;
  left: 0;
  width: 2px;
  background: var(--primary);
  transition: top 0.15s ease-out;
}