/* Right Sticky Sidebar */
.post-sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .post-sidebar-column {
    gap: 2rem;
  }
}

.sticky-sidebar-inner {
  position: sticky;
  top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .sticky-sidebar-inner {
    gap: 2rem;
  }
}

/* Sidebar Widgets */
.sidebar-widget {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.25rem;
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.04);
}

@media (min-width: 640px) {
  .sidebar-widget {
    border-radius: 24px;
    padding: 1.5rem;
  }
}

.sidebar-widget-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.85rem;
  margin-bottom: 1rem;
}

.sidebar-widget-title {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--foreground);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Table of Contents (TOC) inside Sidebar */
.sidebar-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.sidebar-toc-item a {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: flex-start;
  gap: 0.45rem;
  line-height: 1.45;
}

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

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

.sidebar-toc-item a:hover {
  color: var(--primary);
  transform: translateX(3px);
}

.toc-collapse-btn {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted-foreground);
  background-color: var(--secondary);
  border: none;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  cursor: pointer;
}

/* Trending List inside Sidebar */
.sidebar-trending-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-trending-item {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.65rem 0.75rem;
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sidebar-trending-item:hover {
  background-color: var(--secondary);
  transform: translateX(4px);
}

.sidebar-trending-rank {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--muted-foreground);
  opacity: 0.45;
  min-width: 20px;
  line-height: 1.4;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.sidebar-trending-item:hover .sidebar-trending-rank {
  color: var(--foreground);
  opacity: 1;
}

.sidebar-trending-content {
  flex: 1;
  min-width: 0;
}

.sidebar-trending-title {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--foreground);
  margin: 0;
  display: block;
  word-break: break-word;
  transition: color 0.15s;
}

/* Mini Newsletter Box */
.sidebar-newsletter-desc {
  font-size: 0.825rem;
  color: var(--muted-foreground);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.sidebar-newsletter-input-group {
  display: flex;
  border-radius: 9999px;
  border: 1px solid var(--border);
  background-color: var(--secondary);
  overflow: hidden;
  padding: 3px;
  transition: all 0.2s;
}

.sidebar-newsletter-input-group:focus-within {
  border-color: var(--foreground);
  box-shadow: 0 0 0 3px var(--ring);
  background-color: var(--card);
}

.sidebar-newsletter-input {
  width: 100%;
  padding: 0.5rem 0.85rem;
  border: none;
  background: transparent;
  outline: none;
  font-size: 0.825rem;
  color: var(--foreground);
}

.sidebar-newsletter-btn {
  background-color: var(--foreground);
  color: var(--background);
  border: none;
  padding: 0 1rem;
  border-radius: 9999px;
  font-size: 0.775rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}