/* ==========================================================================
   ProKeeper Documentation Hub - Stylesheet
   Inspired by Authentik & Home Assistant Docs Design Aesthetics
   ========================================================================== */

:root {
  /* Color Palette - Dark Mode (Default) */
  --pk-bg-page: #030712;
  --pk-bg-surface: #0b0f19;
  --pk-bg-card: #111827;
  --pk-bg-card-hover: #1f293d;
  --pk-bg-subtle: #1e293b;
  
  --pk-border-color: #1f2937;
  --pk-border-subtle: #374151;
  --pk-border-focus: #3b82f6;

  --pk-text-primary: #f9fafb;
  --pk-text-secondary: #9ca3af;
  --pk-text-muted: #6b7280;
  --pk-text-inverse: #030712;

  --pk-accent-blue: #3b82f6;
  --pk-accent-blue-hover: #2563eb;
  --pk-accent-blue-subtle: rgba(59, 130, 246, 0.12);
  --pk-accent-indigo: #6366f1;
  --pk-accent-emerald: #10b981;
  --pk-accent-amber: #f59e0b;
  --pk-accent-rose: #f43f5e;
  --pk-accent-cyan: #06b6d4;

  /* Typography */
  --pk-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --pk-font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Spacing & Layout */
  --pk-header-height: 64px;
  --pk-sidebar-left-width: 280px;
  --pk-sidebar-right-width: 240px;
  --pk-content-max-width: 880px;
  --pk-radius-sm: 6px;
  --pk-radius-md: 10px;
  --pk-radius-lg: 14px;
  --pk-radius-full: 9999px;

  /* Shadows */
  --pk-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --pk-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --pk-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --pk-shadow-glow: 0 0 20px rgba(59, 130, 246, 0.35);

  /* Transitions */
  --pk-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
  --pk-bg-page: #ffffff;
  --pk-bg-surface: #f8fafc;
  --pk-bg-card: #f1f5f9;
  --pk-bg-card-hover: #e2e8f0;
  --pk-bg-subtle: #e2e8f0;
  
  --pk-border-color: #e2e8f0;
  --pk-border-subtle: #cbd5e1;
  --pk-border-focus: #2563eb;

  --pk-text-primary: #0f172a;
  --pk-text-secondary: #475569;
  --pk-text-muted: #94a3b8;
  --pk-text-inverse: #ffffff;

  --pk-accent-blue: #2563eb;
  --pk-accent-blue-hover: #1d4ed8;
  --pk-accent-blue-subtle: rgba(37, 99, 235, 0.08);

  --pk-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --pk-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --pk-shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--pk-font-sans);
  font-size: 15px;
  background-color: var(--pk-bg-page);
  color: var(--pk-text-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--pk-bg-page);
  overflow-x: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--pk-border-subtle);
  border-radius: var(--pk-radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--pk-text-muted);
}

/* Top Navigation Header */
.pk-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--pk-header-height);
  background: rgba(3, 7, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--pk-border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  transition: var(--pk-transition);
}

[data-theme="light"] .pk-header {
  background: rgba(255, 255, 255, 0.85);
}

.pk-header-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.pk-mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--pk-border-color);
  color: var(--pk-text-primary);
  padding: 0.4rem;
  border-radius: var(--pk-radius-sm);
  cursor: pointer;
}

.pk-logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--pk-text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.pk-logo-img {
  height: 28px;
  width: auto;
}

.pk-badge-docs {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  background: var(--pk-accent-blue-subtle);
  color: var(--pk-accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--pk-radius-sm);
}

.pk-header-search-btn {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--pk-bg-card);
  border: 1px solid var(--pk-border-color);
  color: var(--pk-text-secondary);
  padding: 0.45rem 0.85rem;
  border-radius: var(--pk-radius-md);
  font-size: 0.85rem;
  cursor: pointer;
  width: 240px;
  transition: var(--pk-transition);
}

.pk-header-search-btn:hover {
  border-color: var(--pk-accent-blue);
  color: var(--pk-text-primary);
  background: var(--pk-bg-card-hover);
}

.pk-kbd-shortcut {
  margin-left: auto;
  font-size: 0.7rem;
  font-family: var(--pk-font-mono);
  padding: 0.15rem 0.35rem;
  background: var(--pk-bg-subtle);
  border: 1px solid var(--pk-border-subtle);
  border-radius: var(--pk-radius-sm);
  color: var(--pk-text-muted);
}

.pk-header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pk-header-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--pk-text-secondary);
  text-decoration: none;
  padding: 0.4rem 0.65rem;
  border-radius: var(--pk-radius-sm);
  transition: var(--pk-transition);
}

.pk-header-link:hover {
  color: var(--pk-text-primary);
  background: var(--pk-bg-card-hover);
}

.pk-theme-toggle {
  background: transparent;
  border: 1px solid var(--pk-border-color);
  color: var(--pk-text-secondary);
  width: 34px;
  height: 34px;
  border-radius: var(--pk-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--pk-transition);
}

.pk-theme-toggle:hover {
  color: var(--pk-accent-blue);
  border-color: var(--pk-accent-blue);
}

/* App Layout Grid (3 Columns) */
.pk-layout {
  display: flex;
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  min-height: calc(100vh - var(--pk-header-height));
  position: relative;
}

/* Left Sidebar - Navigation Tree */
.pk-sidebar-left {
  width: var(--pk-sidebar-left-width);
  flex-shrink: 0;
  position: sticky;
  top: var(--pk-header-height);
  height: calc(100vh - var(--pk-header-height));
  overflow-y: auto;
  border-right: 1px solid var(--pk-border-color);
  padding: 1.25rem 1rem 2rem 1rem;
  background: var(--pk-bg-page);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: var(--pk-transition);
}

.pk-sidebar-filter {
  position: relative;
  margin-bottom: 0.5rem;
}

.pk-sidebar-filter input {
  width: 100%;
  background: var(--pk-bg-card);
  border: 1px solid var(--pk-border-color);
  color: var(--pk-text-primary);
  font-size: 0.85rem;
  padding: 0.45rem 0.75rem 0.45rem 2rem;
  border-radius: var(--pk-radius-sm);
  outline: none;
  transition: var(--pk-transition);
}

.pk-sidebar-filter input:focus {
  border-color: var(--pk-accent-blue);
  box-shadow: 0 0 0 2px var(--pk-accent-blue-subtle);
}

.pk-sidebar-filter-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--pk-text-muted);
  pointer-events: none;
}

.pk-nav-tree {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.pk-nav-group {
  margin-bottom: 0.75rem;
}

.pk-nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pk-text-secondary);
  border-radius: var(--pk-radius-sm);
  cursor: pointer;
  user-select: none;
  transition: var(--pk-transition);
}

.pk-nav-group-header:hover {
  color: var(--pk-text-primary);
  background: var(--pk-bg-card);
}

.pk-nav-group-header .pk-group-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pk-nav-group-header .pk-chevron {
  transition: transform 0.2s ease;
  color: var(--pk-text-muted);
}

.pk-nav-group.collapsed .pk-chevron {
  transform: rotate(-90deg);
}

.pk-nav-group.collapsed .pk-nav-subitems {
  display: none;
}

.pk-nav-subitems {
  list-style: none;
  padding-left: 0.75rem;
  margin-top: 0.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  border-left: 1px solid var(--pk-border-color);
  margin-left: 0.6rem;
}

.pk-nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  color: var(--pk-text-secondary);
  text-decoration: none;
  border-radius: var(--pk-radius-sm);
  transition: var(--pk-transition);
  line-height: 1.3;
}

.pk-nav-link:hover {
  color: var(--pk-text-primary);
  background: var(--pk-bg-card);
}

.pk-nav-link.active {
  color: var(--pk-accent-blue);
  background: var(--pk-accent-blue-subtle);
  font-weight: 600;
  border-left: 2px solid var(--pk-accent-blue);
  padding-left: calc(0.6rem - 2px);
}

/* Center Content Area */
.pk-main-container {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 4rem 3rem;
  display: flex;
  justify-content: center;
}

.pk-content-wrapper {
  width: 100%;
  max-width: var(--pk-content-max-width);
}

/* Breadcrumbs */
.pk-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--pk-text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.pk-breadcrumbs a {
  color: var(--pk-text-muted);
  text-decoration: none;
  transition: var(--pk-transition);
}

.pk-breadcrumbs a:hover {
  color: var(--pk-accent-blue);
}

.pk-breadcrumbs-separator {
  color: var(--pk-border-subtle);
}

/* Article Meta Header */
.pk-article-header {
  border-bottom: 1px solid var(--pk-border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pk-article-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--pk-text-primary);
}

.pk-article-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--pk-text-muted);
}

.pk-article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.pk-edit-github {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--pk-text-secondary);
  text-decoration: none;
  transition: var(--pk-transition);
}

.pk-edit-github:hover {
  color: var(--pk-accent-blue);
}

/* Rendered Markdown Body */
.pk-markdown-body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--pk-text-primary);
}

.pk-markdown-body p {
  margin-bottom: 1.25rem;
  color: var(--pk-text-secondary);
}

.pk-markdown-body h1,
.pk-markdown-body h2,
.pk-markdown-body h3,
.pk-markdown-body h4,
.pk-markdown-body h5,
.pk-markdown-body h6 {
  color: var(--pk-text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  position: relative;
  scroll-margin-top: calc(var(--pk-header-height) + 1.5rem);
}

.pk-markdown-body h1 {
  font-size: 2rem;
  display: none; /* Already rendered in article header */
}

.pk-markdown-body h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--pk-border-color);
  padding-bottom: 0.5rem;
  margin-top: 2.5rem;
}

.pk-markdown-body h3 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
}

.pk-markdown-body h4 {
  font-size: 1.05rem;
}

.pk-heading-anchor {
  display: inline-block;
  margin-left: 0.5rem;
  color: var(--pk-text-muted);
  opacity: 0;
  text-decoration: none;
  font-weight: normal;
  transition: var(--pk-transition);
}

.pk-markdown-body h2:hover .pk-heading-anchor,
.pk-markdown-body h3:hover .pk-heading-anchor,
.pk-markdown-body h4:hover .pk-heading-anchor {
  opacity: 1;
}

.pk-heading-anchor:hover {
  color: var(--pk-accent-blue);
}

.pk-markdown-body a {
  color: var(--pk-accent-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--pk-transition);
}

.pk-markdown-body a:hover {
  color: var(--pk-accent-blue-hover);
}

.pk-markdown-body strong {
  color: var(--pk-text-primary);
  font-weight: 600;
}

.pk-markdown-body hr {
  border: 0;
  height: 1px;
  background: var(--pk-border-color);
  margin: 2rem 0;
}

.pk-markdown-body ul,
.pk-markdown-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--pk-text-secondary);
}

.pk-markdown-body li {
  margin-bottom: 0.35rem;
}

.pk-markdown-body li > p {
  margin-bottom: 0.35rem;
}

/* Tables */
.pk-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--pk-border-color);
  border-radius: var(--pk-radius-md);
  background: var(--pk-bg-surface);
}

.pk-markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

.pk-markdown-body th {
  background: var(--pk-bg-card);
  color: var(--pk-text-primary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--pk-border-color);
}

.pk-markdown-body td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--pk-border-color);
  color: var(--pk-text-secondary);
}

.pk-markdown-body tr:last-child td {
  border-bottom: none;
}

.pk-markdown-body tr:hover td {
  background: var(--pk-bg-card-hover);
}

/* Keyboard Shortcuts & Inline Code */
.pk-markdown-body code {
  font-family: var(--pk-font-mono);
  font-size: 0.85em;
  background: var(--pk-bg-subtle);
  color: var(--pk-accent-blue);
  padding: 0.15rem 0.4rem;
  border-radius: var(--pk-radius-sm);
  border: 1px solid var(--pk-border-color);
}

kbd,
.pk-markdown-body kbd {
  font-family: var(--pk-font-mono);
  font-size: 0.75rem;
  background: var(--pk-bg-card);
  color: var(--pk-text-primary);
  border: 1px solid var(--pk-border-subtle);
  border-bottom-width: 2px;
  border-radius: var(--pk-radius-sm);
  padding: 0.15rem 0.45rem;
  display: inline-block;
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

/* Code Blocks with Syntax Highlighting & Copy Button */
.pk-code-block-wrapper {
  position: relative;
  margin: 1.5rem 0;
  border-radius: var(--pk-radius-md);
  border: 1px solid var(--pk-border-color);
  background: #0d1117;
  overflow: hidden;
}

[data-theme="light"] .pk-code-block-wrapper {
  background: #1e293b;
}

.pk-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.85rem;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--pk-font-mono);
  font-size: 0.75rem;
  color: #94a3b8;
  text-transform: uppercase;
}

.pk-code-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #94a3b8;
  padding: 0.2rem 0.5rem;
  border-radius: var(--pk-radius-sm);
  font-size: 0.7rem;
  cursor: pointer;
  transition: var(--pk-transition);
}

.pk-code-copy-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
}

.pk-code-block-wrapper pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--pk-font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
  color: #e6edf3;
}

.pk-code-block-wrapper pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: inherit;
  font-size: inherit;
}

/* Callout Boxes (Admonitions) - Authentik / Home Assistant Style */
.pk-callout {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-radius: var(--pk-radius-md);
  border-left: 4px solid;
  display: flex;
  gap: 1rem;
  background: var(--pk-bg-card);
}

.pk-callout-icon {
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.pk-callout-content {
  flex: 1;
  min-width: 0;
}

.pk-callout-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.pk-callout-content p:last-child {
  margin-bottom: 0;
}

.pk-callout-note {
  border-color: var(--pk-accent-blue);
  background: rgba(59, 130, 246, 0.08);
}
.pk-callout-note .pk-callout-title { color: var(--pk-accent-blue); }
.pk-callout-note .pk-callout-icon { color: var(--pk-accent-blue); }

.pk-callout-tip {
  border-color: var(--pk-accent-emerald);
  background: rgba(16, 185, 129, 0.08);
}
.pk-callout-tip .pk-callout-title { color: var(--pk-accent-emerald); }
.pk-callout-tip .pk-callout-icon { color: var(--pk-accent-emerald); }

.pk-callout-warning {
  border-color: var(--pk-accent-amber);
  background: rgba(245, 158, 11, 0.08);
}
.pk-callout-warning .pk-callout-title { color: var(--pk-accent-amber); }
.pk-callout-warning .pk-callout-icon { color: var(--pk-accent-amber); }

.pk-callout-caution,
.pk-callout-danger {
  border-color: var(--pk-accent-rose);
  background: rgba(244, 63, 94, 0.08);
}
.pk-callout-caution .pk-callout-title,
.pk-callout-danger .pk-callout-title { color: var(--pk-accent-rose); }
.pk-callout-caution .pk-callout-icon,
.pk-callout-danger .pk-callout-icon { color: var(--pk-accent-rose); }

.pk-callout-info,
.pk-callout-important {
  border-color: var(--pk-accent-indigo);
  background: rgba(99, 102, 241, 0.08);
}
.pk-callout-info .pk-callout-title,
.pk-callout-important .pk-callout-title { color: var(--pk-accent-indigo); }
.pk-callout-info .pk-callout-icon,
.pk-callout-important .pk-callout-icon { color: var(--pk-accent-indigo); }

/* Mermaid Diagrams */
.mermaid {
  background: var(--pk-bg-surface);
  border: 1px solid var(--pk-border-color);
  border-radius: var(--pk-radius-md);
  padding: 1.5rem;
  margin: 1.5rem 0;
  display: flex;
  justify-content: center;
  overflow-x: auto;
}

/* Article Navigation Footer (Prev / Next Cards) */
.pk-article-nav {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--pk-border-color);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.pk-nav-card {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.25rem;
  background: var(--pk-bg-card);
  border: 1px solid var(--pk-border-color);
  border-radius: var(--pk-radius-md);
  text-decoration: none;
  transition: var(--pk-transition);
}

.pk-nav-card:hover {
  border-color: var(--pk-accent-blue);
  transform: translateY(-2px);
  box-shadow: var(--pk-shadow-md);
  background: var(--pk-bg-card-hover);
}

.pk-nav-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pk-text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.35rem;
}

.pk-nav-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--pk-text-primary);
}

.pk-nav-card.next {
  text-align: right;
}
.pk-nav-card.next .pk-nav-card-label {
  justify-content: flex-end;
}

/* Right Sidebar - "On this page" TOC */
.pk-sidebar-right {
  width: var(--pk-sidebar-right-width);
  flex-shrink: 0;
  position: sticky;
  top: var(--pk-header-height);
  height: calc(100vh - var(--pk-header-height));
  overflow-y: auto;
  padding: 2.5rem 1.25rem 2rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pk-toc-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pk-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pk-toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-left: 1px solid var(--pk-border-color);
  padding-left: 0.75rem;
}

.pk-toc-link {
  font-size: 0.82rem;
  color: var(--pk-text-secondary);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  transition: var(--pk-transition);
}

.pk-toc-link:hover {
  color: var(--pk-text-primary);
}

.pk-toc-link.active {
  color: var(--pk-accent-blue);
  font-weight: 600;
}

.pk-toc-h3 {
  padding-left: 0.75rem;
  font-size: 0.78rem;
}

/* Search Modal Overlay */
.pk-search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.pk-search-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.pk-search-modal {
  width: 90%;
  max-width: 640px;
  background: var(--pk-bg-surface);
  border: 1px solid var(--pk-border-color);
  border-radius: var(--pk-radius-lg);
  box-shadow: var(--pk-shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 75vh;
  transform: translateY(-10px) scale(0.98);
  transition: transform 0.2s ease;
}

.pk-search-modal-backdrop.open .pk-search-modal {
  transform: translateY(0) scale(1);
}

.pk-search-input-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--pk-border-color);
  background: var(--pk-bg-card);
}

.pk-search-input-wrapper input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 1.1rem;
  color: var(--pk-text-primary);
  font-family: var(--pk-font-sans);
}

.pk-search-input-wrapper input::placeholder {
  color: var(--pk-text-muted);
}

.pk-search-clear-btn {
  background: transparent;
  border: none;
  color: var(--pk-text-muted);
  cursor: pointer;
  padding: 0.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pk-search-results {
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pk-search-empty {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--pk-text-muted);
  font-size: 0.9rem;
}

.pk-search-item {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 1rem;
  background: var(--pk-bg-card);
  border: 1px solid transparent;
  border-radius: var(--pk-radius-md);
  text-decoration: none;
  transition: var(--pk-transition);
  cursor: pointer;
}

.pk-search-item:hover,
.pk-search-item.selected {
  border-color: var(--pk-accent-blue);
  background: var(--pk-bg-card-hover);
}

.pk-search-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.pk-search-item-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--pk-text-primary);
}

.pk-search-item-category {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--pk-accent-blue);
  background: var(--pk-accent-blue-subtle);
  padding: 0.15rem 0.45rem;
  border-radius: var(--pk-radius-sm);
}

.pk-search-item-snippet {
  font-size: 0.82rem;
  color: var(--pk-text-secondary);
  line-height: 1.4;
}

.pk-search-item-snippet mark {
  background: rgba(59, 130, 246, 0.25);
  color: #60a5fa;
  font-weight: 600;
  border-radius: 2px;
  padding: 0 2px;
}

.pk-search-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.25rem;
  background: var(--pk-bg-card);
  border-top: 1px solid var(--pk-border-color);
  font-size: 0.75rem;
  color: var(--pk-text-muted);
}

.pk-search-footer-shortcuts {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Loading & Error States */
.pk-loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  gap: 1rem;
  color: var(--pk-text-secondary);
}

.pk-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--pk-border-subtle);
  border-top-color: var(--pk-accent-blue);
  border-radius: 50%;
  animation: pk-spin 0.8s linear infinite;
}

@keyframes pk-spin {
  to { transform: rotate(360deg); }
}

/* Responsive Media Queries */
@media (max-width: 1100px) {
  .pk-sidebar-right {
    display: none;
  }
}

@media (max-width: 860px) {
  .pk-mobile-toggle {
    display: flex;
  }

  .pk-sidebar-left {
    position: fixed;
    top: var(--pk-header-height);
    left: 0;
    bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
    box-shadow: var(--pk-shadow-lg);
    background: var(--pk-bg-surface);
  }

  .pk-sidebar-left.open {
    transform: translateX(0);
  }

  .pk-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 45;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease;
  }

  .pk-sidebar-backdrop.open {
    opacity: 1;
    visibility: visible;
  }

  .pk-main-container {
    padding: 1.5rem 1.25rem 3rem 1.25rem;
  }

  .pk-article-title {
    font-size: 1.75rem;
  }

  .pk-header-search-btn {
    width: 140px;
  }

  .pk-article-nav {
    grid-template-columns: 1fr;
  }
}