/* ==========================================================================
   STICKY LINE SIDEBAR (DYNAMIC TOC & DRAWER)
   ========================================================================== */

:root {
  --toc-accent: var(--color-blue, #205CFC);
  --toc-accent-gradient: linear-gradient(90deg, var(--color-blue, #205CFC) 0%, var(--color-purple, #921FFA) 100%);
  --toc-text: var(--color-muted, #555555);
  --toc-marker-color: #cbd5e1;
  --toc-marker-length: 32px;
  --toc-max-shift: 10px;
}

#line-toc,
.line-sidebar {
  position: sticky;
  top: 100px;
  background: var(--color-white, #ffffff);
  border: 1px solid rgba(32, 92, 252, 0.10);
  border-radius: var(--radius-card, 20px);
  padding: 24px;
  box-shadow: var(--shadow-light, 0 8px 24px rgba(0, 0, 0, 0.08));
  transition: var(--transition-smooth);
  z-index: 99;
}

.line-sidebar__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: #f1f3f5;
  border: none;
  border-radius: 50px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text, #1a1a1a);
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04);
  transition: var(--transition-fast);
}

.line-sidebar__toggle:hover {
  background: #e9ecef;
}

.line-sidebar__toggle-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
}

.line-sidebar.is-collapsed .line-sidebar__list {
  display: none;
}

.line-sidebar.is-collapsed .line-sidebar__toggle-icon {
  transform: rotate(-90deg);
}

.line-sidebar__list {
  list-style: none !important;
  margin: 16px 0 0 0 !important;
  padding: 0 0 0 calc(var(--toc-marker-length) + 8px) !important;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
}

.line-sidebar__item {
  position: relative;
  display: flex;
  align-items: center;
  cursor: pointer;
}

.line-sidebar__label {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--toc-text);
  font-size: 0.95rem;
  line-height: 1.3;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.line-sidebar__index {
  font-size: 0.85em;
  font-weight: 700;
  opacity: 0.6;
}

.line-sidebar__marker {
  position: absolute;
  top: 50%;
  left: calc(-1 * var(--toc-marker-length) - 8px);
  width: var(--toc-marker-length);
  height: 2px;
  background-color: var(--toc-marker-color);
  transform: translateY(-50%) scaleX(0.6);
  transform-origin: left center;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.line-sidebar__item:hover .line-sidebar__label,
.line-sidebar__item.is-active .line-sidebar__label {
  transform: translateX(var(--toc-max-shift));
}

.line-sidebar__item:hover .line-sidebar__text {
  color: var(--toc-accent);
}

.line-sidebar__item:hover .line-sidebar__marker {
  background-color: var(--toc-accent);
  transform: translateY(-50%) scaleX(1);
}

.line-sidebar__item.is-active .line-sidebar__text {
  font-weight: 700;
  background: var(--toc-accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.line-sidebar__item.is-active .line-sidebar__index {
  color: var(--toc-accent);
  opacity: 1;
}

.line-sidebar__item.is-active .line-sidebar__marker {
  background: var(--toc-accent-gradient);
  transform: translateY(-50%) scaleX(1.25);
  box-shadow: 0 0 8px rgba(32, 92, 252, 0.4);
}

@media (max-width: 980px) {
  :root {
    --toc-marker-length: 24px;
    --toc-max-shift: 6px;
  }
  
  #line-toc,
  .line-sidebar {
    position: relative;
    top: 0;
    margin-bottom: 30px;
  }
}