/* Post TOC — minimal, readable, scroll-spy friendly */

.post-toc {
  margin: 0 0 1.5rem;
  border: 1px solid var(--border-soft, #1e2430);
  border-radius: 12px;
  background: var(--surface, #12161f);
  overflow: hidden;
}

.post-toc .toc-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.72rem 0.9rem;
  margin: 0;
  border: 0;
  background: transparent;
  color: var(--text, #e6e9f0);
  cursor: pointer;
  text-align: start;
  font: inherit;
  transition: background 0.12s ease;
}

.post-toc .toc-toggle:hover {
  background: color-mix(in srgb, var(--surface-2, #171c27) 80%, transparent);
}

.post-toc .toc-toggle:focus-visible {
  outline: 2px solid var(--accent, #e3b341);
  outline-offset: -2px;
}

.post-toc .toc-toggle-chevron {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  color: var(--text-muted, #8b93a7);
  transition: transform 0.18s ease, color 0.12s ease;
}

.post-toc .toc-toggle-chevron::before {
  content: "";
  width: 0.3rem;
  height: 0.3rem;
  border-inline-end: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
}

.post-toc[dir="rtl"] .toc-toggle-chevron::before {
  transform: rotate(135deg);
}

.post-toc.is-open .toc-toggle-chevron {
  color: var(--accent, #e3b341);
  transform: rotate(90deg);
}

.post-toc[dir="rtl"].is-open .toc-toggle-chevron {
  transform: rotate(-90deg);
}

.post-toc .toc-title {
  flex: 1;
  font-weight: 650;
  font-size: 0.84rem;
  letter-spacing: 0.01em;
}

.post-toc .toc-count {
  min-width: 1.35rem;
  height: 1.25rem;
  padding: 0 0.35rem;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1.25rem;
  text-align: center;
  background: var(--surface-2, #171c27);
  color: var(--text-muted, #8b93a7);
  border: 1px solid var(--border-soft, #1e2430);
  font-variant-numeric: tabular-nums;
}

.post-toc.is-open .toc-count {
  background: color-mix(in srgb, var(--accent, #e3b341) 14%, transparent);
  color: var(--accent, #e3b341);
  border-color: transparent;
}

.post-toc .toc-body {
  border-top: 1px solid var(--border-soft, #1e2430);
  max-height: min(20rem, 50vh);
  overflow: auto;
  padding: 0.4rem 0.35rem 0.55rem;
  scrollbar-width: thin;
}

.post-toc .toc-body[hidden] {
  display: none !important;
}

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

.post-toc .toc-item {
  margin: 0;
}

.post-toc .toc-link {
  display: block;
  padding: 0.4rem 0.65rem;
  border-radius: 7px;
  color: var(--text-muted, #8b93a7);
  text-decoration: none;
  font-size: 0.82rem;
  line-height: 1.45;
  transition: background 0.1s ease, color 0.1s ease;
  border-inline-start: 2px solid transparent;
}

/* hierarchy via padding, not nested lists */
.post-toc .toc-depth-0 > .toc-link {
  font-weight: 600;
  color: var(--text, #e6e9f0);
  font-size: 0.84rem;
}

.post-toc .toc-depth-1 > .toc-link {
  padding-inline-start: 1.15rem;
  font-size: 0.8rem;
}

.post-toc .toc-depth-2 > .toc-link {
  padding-inline-start: 1.7rem;
  font-size: 0.76rem;
  opacity: 0.95;
}

.post-toc .toc-depth-3 > .toc-link {
  padding-inline-start: 2.2rem;
  font-size: 0.74rem;
  opacity: 0.9;
}

.post-toc .toc-link:hover {
  background: var(--surface-2, #171c27);
  color: var(--accent, #e3b341);
}

.post-toc .toc-link.is-active {
  background: color-mix(in srgb, var(--accent, #e3b341) 10%, transparent);
  color: var(--accent, #e3b341);
  font-weight: 600;
  border-inline-start-color: var(--accent, #e3b341);
}

/* —— Desktop sticky sidebar —— */
.post-toc--sidebar {
  margin: 0;
  border-radius: 12px;
  border: 1px solid var(--border-soft, #1e2430);
  background: color-mix(in srgb, var(--surface, #12161f) 90%, transparent);
  backdrop-filter: blur(12px) saturate(1.15);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
  overflow: hidden;
}

.post-toc--sidebar .toc-toggle {
  padding: 0.65rem 0.8rem 0.4rem;
  cursor: default;
  pointer-events: none;
}

.post-toc--sidebar .toc-toggle:hover {
  background: transparent;
}

.post-toc--sidebar .toc-toggle-chevron {
  display: none;
}

.post-toc--sidebar .toc-title {
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted, #8b93a7);
}

.post-toc--sidebar .toc-count {
  display: none;
}

.post-toc--sidebar .toc-body {
  border-top: none;
  max-height: min(70vh, 28rem);
  padding: 0.1rem 0.35rem 0.65rem;
}

.post-toc--sidebar.is-open .toc-body {
  display: block !important;
}

.post-toc--sidebar .toc-link {
  padding: 0.34rem 0.55rem;
  font-size: 0.78rem;
  line-height: 1.4;
}

.post-toc--sidebar .toc-depth-0 > .toc-link {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text, #e6e9f0);
}

.post-toc--sidebar .toc-depth-1 > .toc-link { padding-inline-start: 1rem; font-size: 0.76rem; }
.post-toc--sidebar .toc-depth-2 > .toc-link { padding-inline-start: 1.45rem; font-size: 0.72rem; }
.post-toc--sidebar .toc-depth-3 > .toc-link { padding-inline-start: 1.85rem; font-size: 0.7rem; }

.post-toc--sidebar .toc-link:hover {
  background: color-mix(in srgb, var(--accent, #e3b341) 8%, transparent);
  color: var(--accent, #e3b341);
}

.post-toc--sidebar .toc-link.is-active {
  background: color-mix(in srgb, var(--accent, #e3b341) 11%, transparent);
  color: var(--accent, #e3b341);
  border-inline-start-color: var(--accent, #e3b341);
}

/* Active section highlight in article */
.is-section-active {
  scroll-margin-top: 6rem;
}

html[data-theme="light"] .post-toc {
  background: var(--surface, #fff);
  border-color: var(--border-soft, #e4e7ee);
}

html[data-theme="light"] .post-toc .toc-toggle:hover {
  background: var(--surface-2, #f0f2f6);
}

html[data-theme="light"] .post-toc .toc-count {
  background: var(--surface-2, #f0f2f6);
  border-color: var(--border, #d5dae3);
}

html[data-theme="light"] .post-toc--sidebar {
  background: color-mix(in srgb, var(--surface, #fff) 94%, transparent);
  border-color: var(--border-soft, #e4e7ee);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

@media (prefers-reduced-motion: reduce) {
  .post-toc .toc-toggle-chevron {
    transition: none;
  }
}