/* Post Hero Image */
.post-hero-image-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 2rem;
  background-color: var(--secondary);
  box-shadow: 0 10px 30px -8px rgba(0, 0, 0, 0.06);
}

@media (min-width: 640px) {
  .post-hero-image-wrap {
    border-radius: 24px;
    margin-bottom: 2.75rem;
  }
}

.post-hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* In-Article Table of Contents (TOC) */
.toc-container {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.15rem 1.25rem;
  margin-bottom: 2.25rem;
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.04);
}

@media (min-width: 640px) {
  .toc-container {
    border-radius: 22px;
    padding: 1.5rem 1.75rem;
    margin-bottom: 3rem;
  }
}

.toc-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.toc-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--foreground);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .toc-heading {
    font-size: 1.05rem;
    gap: 0.6rem;
  }
}

.toc-toggle-indicator {
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
  background-color: var(--secondary);
  padding: 0.2rem 0.65rem;
  border-radius: 9999px;
  transition: all 0.15s;
}

.toc-nav-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  border-top: 1px solid var(--border);
  padding-top: 0.85rem;
}

@media (min-width: 640px) {
  .toc-nav-list {
    margin: 1.25rem 0 0;
    gap: 0.65rem;
    padding-top: 1rem;
  }
}

.toc-nav-item a {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  line-height: 1.5;
}

@media (min-width: 640px) {
  .toc-nav-item a {
    font-size: 0.925rem;
  }
}

.toc-nav-item.level-2 {
  font-weight: 600;
  color: var(--foreground);
}

.toc-nav-item.level-3 {
  padding-left: 1rem;
  font-size: 0.825rem;
}

@media (min-width: 640px) {
  .toc-nav-item.level-3 {
    padding-left: 1.25rem;
    font-size: 0.875rem;
  }
}

.toc-nav-item a:hover {
  color: var(--primary);
  transform: translateX(4px);
}