/* ============================================
   MarkStack - Main Stylesheet
   Professional Knowledge Base Theme
   ============================================ */

/* CSS Custom Properties (Theme Variables) */
:root {
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Fira Code', Consolas, Monaco, 'Courier New', monospace;
  --font-size-xs: 0.8rem;
  --font-size-sm: 0.925rem;
  --font-size-base: 1.0625rem;
  --font-size-lg: 1.1875rem;
  --font-size-xl: 1.3125rem;
  --font-size-2xl: 1.5625rem;
  --font-size-3xl: 2.125rem;
  
  /* Layout */
  --sidebar-width: 320px;
  --header-height: 60px;
  --breadcrumb-height: 44px;
  --content-max-width: 900px;
  --border-radius: 6px;
  --border-radius-lg: 10px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Dark Theme (Default) - Slate */
[data-theme="dark"] {
  --color-bg-primary: #1e293b;
  --color-bg-secondary: #273449;
  --color-bg-tertiary: #334155;
  --color-bg-hover: #3e4f6a;
  --color-bg-active: #4a5e7d;
  
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-tertiary: #64748b;
  --color-text-link: #60a5fa;
  --color-text-link-hover: #93c5fd;
  
  --color-border: #3e4f6a;
  --color-border-subtle: #334155;
  
  --color-accent: #22c55e;
  --color-accent-hover: #16a34a;
  --color-accent-subtle: rgba(34, 197, 94, 0.15);
  
  /* Syntax Highlighting */
  --color-code-bg: #1a2332;
  --color-code-border: #3e4f6a;
  
  /* Alerts - GitHub style */
  --color-note-bg: rgba(136, 87, 229, 0.2);
  --color-note-border: #8957e5;
  --color-note-text: #a371f7;
  
  --color-tip-bg: rgba(35, 134, 54, 0.2);
  --color-tip-border: #238636;
  --color-tip-text: #3fb950;
  
  --color-important-bg: rgba(56, 139, 253, 0.2);
  --color-important-border: #388bfd;
  --color-important-text: #58a6ff;
  
  --color-warning-bg: rgba(187, 128, 9, 0.2);
  --color-warning-border: #9e6a03;
  --color-warning-text: #d29922;
  
  --color-caution-bg: rgba(248, 81, 73, 0.2);
  --color-caution-border: #da3633;
  --color-caution-text: #f85149;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* Light Theme */
[data-theme="light"] {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f6f8fa;
  --color-bg-tertiary: #eaeef2;
  --color-bg-hover: #e1e4e8;
  --color-bg-active: #d0d7de;
  
  --color-text-primary: #1f2328;
  --color-text-secondary: #57606a;
  --color-text-tertiary: #6e7781;
  --color-text-link: #0969da;
  --color-text-link-hover: #0550ae;
  
  --color-border: #d0d7de;
  --color-border-subtle: #e1e4e8;
  
  --color-accent: #1a7f37;
  --color-accent-hover: #116329;
  --color-accent-subtle: rgba(26, 127, 55, 0.1);
  
  /* Syntax Highlighting */
  --color-code-bg: #f6f8fa;
  --color-code-border: #d0d7de;
  
  /* Alerts */
  --color-note-bg: rgba(9, 105, 218, 0.08);
  --color-note-border: #0969da;
  --color-note-text: #0550ae;
  
  --color-tip-bg: rgba(26, 127, 55, 0.08);
  --color-tip-border: #1a7f37;
  --color-tip-text: #116329;
  
  --color-important-bg: rgba(130, 80, 223, 0.08);
  --color-important-border: #8250df;
  --color-important-text: #6639ba;
  
  --color-warning-bg: rgba(154, 103, 0, 0.08);
  --color-warning-border: #9a6700;
  --color-warning-text: #7d4e00;
  
  --color-caution-bg: rgba(207, 34, 46, 0.08);
  --color-caution-border: #cf222e;
  --color-caution-text: #a40e26;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden; /* Prevent horizontal scroll on mobile */
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

a {
  color: var(--color-text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-text-link-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

/* Offset for fixed header + breadcrumb */
body {
  padding-top: calc(var(--header-height) + var(--breadcrumb-height));
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 100%;
  margin: 0;
  padding: 0 var(--space-xl);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: var(--font-size-lg);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo:hover {
  color: var(--color-text-primary);
  text-decoration: none;
}

.logo-icon {
  color: var(--color-accent);
}

/* Search */
.header-search {
  position: relative;
  flex: 1;
  max-width: 500px;
  margin: 0 var(--space-lg);
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

#search-input {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-xl) 0 calc(var(--space-md) + 24px);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

#search-input::placeholder {
  color: var(--color-text-tertiary);
}

#search-input:focus {
  outline: none;
  border-color: var(--color-text-link);
  background-color: var(--color-bg-primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.search-shortcut {
  position: absolute;
  right: var(--space-sm);
  padding: 2px 6px;
  background-color: var(--color-bg-hover);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-family: var(--font-sans);
}

/* Search Results */
.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  max-height: 400px;
  overflow-y: auto;
  z-index: 200;
}

.search-results.active {
  display: block;
}

.search-result-item {
  display: block;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--transition-fast);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover,
.search-result-item:focus {
  background-color: var(--color-bg-hover);
  text-decoration: none;
  outline: none;
}

.search-result-title {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.search-result-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.search-result-path {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.search-hint {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-align: center;
  border-top: 1px solid var(--color-border-subtle);
  background-color: var(--color-bg-tertiary);
}

.search-no-results {
  padding: var(--space-lg);
  text-align: center;
  color: var(--color-text-secondary);
}

/* Search Modal */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}

.search-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.search-modal-content {
  position: relative;
  width: 95%;
  max-width: 1000px;
  max-height: 80vh;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.search-modal-header {
  padding: var(--space-lg);
  padding-right: 60px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.search-modal-header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.search-modal-query {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

.search-modal-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  background-color: var(--color-bg-hover);
  padding: 4px 12px;
  border-radius: 12px;
}

.search-modal-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-hover);
  border: 1px solid var(--color-border);
  font-size: 24px;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.search-modal-close:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
}

.search-modal-body {
  overflow-y: auto;
  flex: 1;
}

.search-modal-result {
  display: block;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--transition-fast);
  text-decoration: none;
}

.search-modal-result:hover {
  background-color: var(--color-bg-hover);
  text-decoration: none;
}

.search-modal-result:last-child {
  border-bottom: none;
}

.search-modal-result-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}

.search-modal-result-title {
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
}

.search-modal-result-path {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
}

.search-modal-result-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.search-modal-result-excerpt mark,
.search-result-excerpt mark,
.search-result-title mark,
.search-modal-result-title mark {
  background-color: rgba(255, 213, 0, 0.3);
  color: inherit;
  padding: 0 2px;
  border-radius: 2px;
}

.search-modal-empty {
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-text-secondary);
}

.search-modal-empty p {
  margin: var(--space-sm) 0;
}

/* Theme Toggle */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.github-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

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

.github-icon {
  width: 22px;
  height: 22px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}

[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: block;
}

/* ============================================
   Breadcrumbs
   ============================================ */
.breadcrumb-bar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 99;
  height: var(--breadcrumb-height);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
}

.breadcrumb-container {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: 100%;
  margin: 0;
  padding: 0 var(--space-lg);
  font-size: var(--font-size-sm);
  overflow-x: auto;
  white-space: nowrap;
}

.breadcrumb-home {
  display: flex;
  align-items: center;
}

.breadcrumb-home-icon {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb-home:hover .breadcrumb-home-icon {
  color: var(--color-text-link);
}

.breadcrumb-container a {
  color: var(--color-text-secondary);
}

.breadcrumb-container a:hover {
  color: var(--color-text-link);
}

.breadcrumb-separator {
  margin: 0 var(--space-sm);
  color: var(--color-text-tertiary);
}

.breadcrumb-current {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ============================================
   Main Layout
   ============================================ */
.main-layout {
  display: block;
  min-height: calc(100vh - var(--header-height) - var(--breadcrumb-height) - 60px);
  margin-left: var(--sidebar-width);
  transition: margin-left var(--transition-normal);
}

/* Collapsed sidebar state - support both html and body class for flash prevention */
html.sidebar-collapsed .main-layout,
body.sidebar-collapsed .main-layout {
  margin-left: 0;
}

html.sidebar-collapsed .sidebar,
body.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}

html.sidebar-collapsed .sidebar-collapse-toggle,
body.sidebar-collapsed .sidebar-collapse-toggle {
  left: var(--space-sm);
}

html.sidebar-collapsed .sidebar-collapse-toggle .expand-icon,
body.sidebar-collapsed .sidebar-collapse-toggle .expand-icon {
  display: block;
}

html.sidebar-collapsed .sidebar-collapse-toggle .collapse-icon,
body.sidebar-collapsed .sidebar-collapse-toggle .collapse-icon {
  display: none;
}

html.sidebar-collapsed .site-footer,
body.sidebar-collapsed .site-footer {
  left: 0;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: calc(var(--header-height) + var(--breadcrumb-height));
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height) - var(--breadcrumb-height));
  overflow-y: auto;
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border-subtle);
  padding: var(--space-md) var(--space-sm);
  z-index: 98;
  transition: transform var(--transition-normal);
}

/* Sidebar Toggle Button - Fixed position, always visible */
.sidebar-collapse-toggle {
  position: fixed;
  top: calc(var(--header-height) + var(--breadcrumb-height) + var(--space-sm));
  left: calc(var(--sidebar-width) - 40px);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast), left var(--transition-normal);
  z-index: 100;
}

.sidebar-collapse-toggle:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.sidebar-collapse-toggle .expand-icon {
  display: none;
}

.sidebar-collapse-toggle .collapse-icon {
  display: block;
}

.sidebar-nav {
  font-size: var(--font-size-sm);
  padding-top: 40px;
}

.sidebar-list {
  list-style: none;
}

.sidebar-level-0 {
  padding: 0;
}

.sidebar-level-1 {
  padding-left: 0.75rem;
  border-left: 1px solid var(--color-border-subtle);
  margin-left: 0.5rem;
}

.sidebar-level-2 {
  padding-left: 0.75rem;
  border-left: 1px solid var(--color-border-subtle);
  margin-left: 0.5rem;
}

.sidebar-level-3 {
  padding-left: 0.75rem;
  border-left: 1px solid var(--color-border-subtle);
  margin-left: 0.5rem;
}

.sidebar-item {
  margin-bottom: 2px;
}

.sidebar-folder-header {
  display: flex;
  align-items: center;
}

.sidebar-folder-header a {
  flex: 1;
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  padding: 0;
  margin-right: 2px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.sidebar-chevron {
  width: 14px;
  height: 14px;
}

.sidebar-children {
  display: none;
}

.sidebar-children.expanded {
  display: block;
}

.sidebar-item a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-text-secondary);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-item a:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
  text-decoration: none;
}

.sidebar-item.sidebar-current > a,
.sidebar-item.sidebar-current > .sidebar-folder-header a {
  background-color: var(--color-bg-hover);
  color: var(--color-text-link);
  font-weight: 500;
}

.sidebar-item.sidebar-folder > .sidebar-folder-header a {
  font-weight: 500;
  color: var(--color-text-primary);
}

.sidebar-item.sidebar-expanded > .sidebar-folder-header a {
  color: var(--color-text-link);
}

.sidebar-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: currentColor;
  opacity: 0.7;
}

/* Content */
.content {
  padding: var(--space-xl) 5%;
  padding-bottom: 60px; /* Space for fixed footer */
  overflow-x: hidden;
}

.article {
  max-width: 100%;
  margin: 0 auto;
}

/* ============================================
   Typography
   ============================================ */
.article h1, .article h2, .article h3, 
.article h4, .article h5, .article h6 {
  color: var(--color-text-primary);
  font-weight: 600;
  line-height: 1.3;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  scroll-margin-top: calc(var(--header-height) + var(--breadcrumb-height) + var(--space-lg));
}

.article h1 {
  font-size: var(--font-size-3xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  margin-top: 0;
}

.article h2 {
  font-size: var(--font-size-2xl);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

.article h3 {
  font-size: var(--font-size-xl);
}

.article h4 {
  font-size: var(--font-size-lg);
}

.article h5, .article h6 {
  font-size: var(--font-size-base);
}

.article p {
  margin-bottom: var(--space-md);
}

.article ul, .article ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.article li {
  margin-bottom: var(--space-xs);
}

.article li > ul, .article li > ol {
  margin-top: var(--space-xs);
  margin-bottom: 0;
}

/* Heading Anchors */
.heading-anchor {
  color: var(--color-text-tertiary);
  text-decoration: none;
  opacity: 0;
  margin-right: var(--space-sm);
  transition: opacity var(--transition-fast);
}

.article h1:hover .heading-anchor,
.article h2:hover .heading-anchor,
.article h3:hover .heading-anchor,
.article h4:hover .heading-anchor,
.article h5:hover .heading-anchor,
.article h6:hover .heading-anchor {
  opacity: 1;
}

.heading-anchor:hover {
  color: var(--color-text-link);
}

/* ============================================
   Code
   ============================================ */
.article code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-code-border);
}

.article pre {
  margin-bottom: var(--space-md);
  border-radius: var(--border-radius);
  overflow-x: auto;
}

.article pre code {
  display: block;
  padding: var(--space-md);
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.article pre.hljs {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-md);
}

.article pre.hljs code {
  border: none;
  padding: var(--space-md);
}

/* ============================================
   Tables
   ============================================ */
.article table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  font-size: var(--font-size-sm);
}

.article th, .article td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border: 1px solid var(--color-border);
}

.article th {
  background-color: var(--color-bg-secondary);
  font-weight: 700;
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.article tr:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

/* ============================================
   Blockquotes & Alerts
   ============================================ */
.article blockquote {
  margin: 0 0 var(--space-md) 0;
  padding: var(--space-md) var(--space-lg);
  border-left: 4px solid var(--color-border);
  background-color: var(--color-bg-secondary);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  color: var(--color-text-secondary);
}

.article blockquote > p:last-child {
  margin-bottom: 0;
}

/* GitHub-style Alerts */
.article blockquote.alert {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius);
}

.article .alert-title {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-size: var(--font-size-sm);
}

.article .alert-icon {
  display: inline-flex;
  width: 16px;
  height: 16px;
}

.article .alert-icon svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.article .alert-note {
  background-color: var(--color-note-bg);
  border-left-color: var(--color-note-border);
  color: var(--color-text-primary);
}

.article .alert-note .alert-title {
  color: var(--color-note-text);
}

.article .alert-tip {
  background-color: var(--color-tip-bg);
  border-left-color: var(--color-tip-border);
  color: var(--color-text-primary);
}

.article .alert-tip .alert-title {
  color: var(--color-tip-text);
}

.article .alert-important {
  background-color: var(--color-important-bg);
  border-left-color: var(--color-important-border);
  color: var(--color-text-primary);
}

.article .alert-important .alert-title {
  color: var(--color-important-text);
}

.article .alert-warning {
  background-color: var(--color-warning-bg);
  border-left-color: var(--color-warning-border);
  color: var(--color-text-primary);
}

.article .alert-warning .alert-title {
  color: var(--color-warning-text);
}

.article .alert-caution {
  background-color: var(--color-caution-bg);
  border-left-color: var(--color-caution-border);
  color: var(--color-text-primary);
}

.article .alert-caution .alert-title {
  color: var(--color-caution-text);
}

/* ============================================
   Images
   ============================================ */
.article img {
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

/* ============================================
   Horizontal Rule
   ============================================ */
.article hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

/* ============================================
   Homepage
   ============================================ */
.homepage-hero {
  text-align: center;
  padding: var(--space-2xl) 0;
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.homepage-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-md);
  border: none;
  padding: 0;
}

.homepage-hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   Error Page
   ============================================ */
.error-page {
  text-align: center;
  padding: var(--space-2xl);
}

.error-page h1 {
  font-size: 6rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
  border: none;
}

.error-page p {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.btn:hover {
  background-color: var(--color-accent-hover);
  color: white;
  text-decoration: none;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  position: fixed;
  bottom: 0;
  left: var(--sidebar-width);
  right: 0;
  z-index: 97;
  padding: 4px 0;
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  line-height: 1.3;
  transition: left var(--transition-normal);
}

.footer-container {
  text-align: center;
}

.site-footer p {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin: 0;
}

.site-footer .copyright {
  font-weight: 600;
}

/* ============================================
   Responsive
   ============================================ */

/* Mobile Menu Toggle Button - OUTSIDE header to escape stacking context */
.mobile-menu-toggle {
  display: none;
  position: fixed;
  top: 10px;
  left: 16px;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.mobile-menu-toggle svg {
  pointer-events: none;
  width: 20px;
  height: 20px;
}

.mobile-menu-toggle .menu-icon-open {
  display: block;
}

.mobile-menu-toggle .menu-icon-close {
  display: none;
}

body.mobile-menu-open .mobile-menu-toggle .menu-icon-open,
html.mobile-menu-open .mobile-menu-toggle .menu-icon-open {
  display: none;
}

body.mobile-menu-open .mobile-menu-toggle .menu-icon-close,
html.mobile-menu-open .mobile-menu-toggle .menu-icon-close {
  display: block;
}

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 199;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

body.mobile-menu-open .mobile-overlay,
html.mobile-menu-open .mobile-overlay {
  opacity: 1;
}

@media (max-width: 1024px) {
  /* Reset main layout - no sidebar offset */
  .main-layout {
    margin-left: 0;
  }
  
  /* Sidebar as slide-in overlay - NOT affecting layout */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    max-width: 85vw;
    height: 100dvh;
    height: 100vh; /* Fallback for older browsers */
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: 200;
    border-right: 1px solid var(--color-border-subtle);
    background-color: var(--color-bg-secondary);
    padding-top: 60px;
  }
  
  .sidebar-nav {
    padding-top: var(--space-sm);
  }
  
  /* Show sidebar when mobile menu is open */
  body.mobile-menu-open .sidebar,
  html.mobile-menu-open .sidebar {
    transform: translateX(0);
  }
  
  /* Show overlay when mobile menu is open */
  body.mobile-menu-open .mobile-overlay {
    display: block;
  }
  
  /* Show mobile menu toggle */
  .mobile-menu-toggle {
    display: flex;
  }
  
  /* Hide desktop sidebar toggle on mobile */
  .sidebar-collapse-toggle {
    display: none;
  }
  
  .logo-text {
    display: none;
  }
  
  /* Adjust header layout for mobile */
  .header-container {
    gap: var(--space-sm);
  }
  
  .header-search {
    position: relative;
    flex: 1;
    max-width: none;
    margin: 0 var(--space-sm);
  }
  
  .search-shortcut {
    display: none;
  }
  
  /* Footer - fixed at bottom, full width, never pushed */
  .site-footer {
    position: fixed;
    left: 0 !important;
    right: 0;
    bottom: 0;
    z-index: 150;
  }
  
  /* Add bottom padding to content so footer doesn't cover it */
  .main-layout {
    padding-bottom: 50px;
  }
}

@media (max-width: 640px) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.5rem;
  }
  
  .header-container {
    padding: 0 var(--space-md);
    gap: var(--space-sm);
  }
  
  .breadcrumb-container {
    padding: 0 var(--space-md);
  }
  
  .content {
    padding: var(--space-md);
  }
  
  .listing-grid {
    grid-template-columns: 1fr;
  }
  
  /* Make search input smaller on mobile */
  .header-search {
    flex: 1;
    min-width: 0;
  }
  
  .search-container input {
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  .header-actions {
    gap: var(--space-xs);
  }
  
  .github-link,
  .theme-toggle {
    width: 36px;
    height: 36px;
  }

  /* Add top padding to code blocks for language label and copy button */
  .code-block-wrapper pre.hljs code {
    padding-top: calc(var(--space-md) + 28px);
  }
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* ============================================
   Code Block Copy Button
   ============================================ */
.code-block-wrapper {
  position: relative;
  margin-bottom: var(--space-md);
}

.code-block-wrapper pre.hljs {
  margin-bottom: 0;
}

/* Language label for code blocks */
pre.hljs[data-language]::before {
  content: attr(data-language);
  position: absolute;
  top: var(--space-sm);
  right: calc(var(--space-sm) + 88px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  color: var(--color-accent);
  font-size: var(--font-size-xs);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.copy-code-btn {
  position: absolute;
  /* Align with the language pill and sit to its right edge */
  top: var(--space-sm);
  right: var(--space-sm);
  width: 82px; /* fixed width so text changes (Copy/Copied!) do not shift layout */
  height: 28px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-hover);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.copy-code-btn:hover {
  background-color: var(--color-bg-active);
  color: var(--color-text-primary);
}

.copy-code-btn.copied {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* ============================================
   Task List Checkboxes
   ============================================ */
.task-list-item {
  list-style: none;
}

.task-list-item-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-text-link);
  border-radius: 3px;
  background-color: transparent;
  margin-right: 8px;
  vertical-align: middle;
  cursor: pointer;
  position: relative;
}

.task-list-item-checkbox:checked {
  background-color: var(--color-text-link);
  border-color: var(--color-text-link);
}

.task-list-item-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* ============================================
   Selection
   ============================================ */
::selection {
  background-color: var(--color-text-link);
  color: white;
}