/**
 * toc-sidebar.css - Wiki-Style TOC Sidebar Styles
 * 
 * For The Building Coder Archive
 * Author: GitHub Copilot
 * Date: January 2, 2026
 * 
 * Features:
 * - Fixed left sidebar with topic-based navigation
 * - Sticky search box with real-time filtering
 * - Drag-to-resize functionality
 * - Collapsible topic groups
 * - Current page highlighting
 * - Mobile-responsive hamburger menu
 */

/* ================================
   CSS Variables
   ================================ */
:root {
  --tbc-sidebar-width: 280px;
  --tbc-sidebar-min-width: 180px;
  --tbc-sidebar-max-width: 500px;
  
  /* Soft, soothing light theme matching original blog styling */
  --tbc-sidebar-bg: #f5f5f5;
  --tbc-sidebar-bg-light: #ebebeb;
  --tbc-sidebar-text: #333333;
  --tbc-sidebar-text-muted: #666666;
  --tbc-sidebar-hover: #e8e8e8;
  --tbc-sidebar-active: #0066cc;
  --tbc-sidebar-border: #dcdcdc;
  
  /* Accent colors - matching original link color */
  --tbc-accent-primary: #0066cc;
  --tbc-accent-secondary: #0077dd;
  --tbc-accent-highlight: #3399ff;
  
  /* Search styling */
  --tbc-search-bg: #ffffff;
  --tbc-search-border: #cccccc;
  --tbc-search-focus: #0066cc;
  --tbc-search-highlight: #fffacd;
  
  /* Layout */
  --tbc-header-height: 50px;
  --tbc-search-height: 55px;
  --tbc-transition-speed: 0.2s;
}

/* ================================
   Base Layout
   ================================ */
html {
  scroll-behavior: smooth;
}

body.tbc-has-sidebar {
  margin: 0;
  padding: 0;
}

/* ================================
   Sidebar Container
   ================================ */
#tbc-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--tbc-sidebar-width);
  min-width: var(--tbc-sidebar-min-width);
  max-width: var(--tbc-sidebar-max-width);
  height: 100vh;
  background: var(--tbc-sidebar-bg);
  color: var(--tbc-sidebar-text);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  box-shadow: 1px 0 3px rgba(31, 35, 40, 0.12);
  border-right: 1px solid var(--tbc-sidebar-border);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

#tbc-sidebar * {
  box-sizing: border-box;
}

/* ================================
   Main Content Area
   ================================ */
#tbc-content {
  margin-left: var(--tbc-sidebar-width);
  min-height: 100vh;
  padding: 20px 40px 20px 40px;
  transition: margin-left var(--tbc-transition-speed) ease;
}

/* Override the inline body styles when sidebar is present */
body.tbc-has-sidebar {
  max-width: none !important;
  margin: 0 !important;
  padding: 0 !important;
}

/* Allow article content to use full width while maintaining readability */
#tbc-content article,
#tbc-content > .nav,
#tbc-content > article {
  max-width: 900px;
  margin-left: 0;
  margin-right: auto;
}

/* ================================
   Resize Handle
   ================================ */
#tbc-resize-handle {
  position: absolute;
  right: 0;
  top: 0;
  width: 5px;
  height: 100%;
  cursor: col-resize;
  background: transparent;
  transition: background var(--tbc-transition-speed);
  z-index: 1001;
}

#tbc-resize-handle:hover,
#tbc-resize-handle.dragging {
  background: rgba(0, 102, 204, 0.4);
}

body.tbc-resizing {
  cursor: col-resize !important;
  user-select: none !important;
}

body.tbc-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}

/* ================================
   Sidebar Header
   ================================ */
#tbc-sidebar-header {
  height: var(--tbc-header-height);
  padding: 10px 15px;
  background: var(--tbc-sidebar-bg-light);
  border-bottom: 1px solid var(--tbc-sidebar-border);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

#tbc-sidebar-header a {
  color: var(--tbc-sidebar-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

#tbc-sidebar-header a:hover {
  color: var(--tbc-sidebar-active);
}

#tbc-sidebar-header .tbc-logo {
  font-size: 20px;
}

/* ================================
   Search Box
   ================================ */
#tbc-search-container {
  padding: 10px 12px;
  background: var(--tbc-sidebar-bg);
  border-bottom: 1px solid var(--tbc-sidebar-border);
  flex-shrink: 0;
}

.tbc-search-wrapper {
  display: flex;
  align-items: center;
  background: var(--tbc-search-bg);
  border: 2px solid var(--tbc-search-border);
  border-radius: 6px;
  padding: 6px 10px;
  transition: border-color var(--tbc-transition-speed), box-shadow var(--tbc-transition-speed);
}

.tbc-search-wrapper:focus-within {
  border-color: var(--tbc-search-focus);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.2);
}

.tbc-search-icon {
  color: var(--tbc-sidebar-text-muted);
  font-size: 14px;
  margin-right: 8px;
  flex-shrink: 0;
}

#tbc-search-input {
  border: none;
  outline: none;
  flex: 1;
  font-size: 14px;
  padding: 2px 0;
  background: transparent;
  color: var(--tbc-sidebar-text);
  min-width: 0;
}

#tbc-search-input::placeholder {
  color: var(--tbc-sidebar-text-muted);
}

#tbc-search-clear {
  background: none;
  border: none;
  cursor: pointer;
  color: #a0aec0;
  font-size: 16px;
  padding: 2px 4px;
  margin-left: 4px;
  border-radius: 3px;
  transition: color var(--tbc-transition-speed), background var(--tbc-transition-speed);
  flex-shrink: 0;
}

#tbc-search-clear:hover {
  color: #4a5568;
  background: #e2e8f0;
}

#tbc-search-clear.hidden {
  display: none;
}

#tbc-search-results {
  font-size: 12px;
  color: var(--tbc-sidebar-text-muted);
  margin-top: 6px;
  text-align: center;
  min-height: 18px;
}

#tbc-search-results.no-results {
  color: #fc8181;
}

/* ================================
   Welcome Link
   ================================ */
#tbc-welcome-link {
  padding: 8px 12px;
  border-bottom: 1px solid var(--tbc-sidebar-border);
}

#tbc-welcome-link a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: linear-gradient(135deg, var(--tbc-accent-primary) 0%, var(--tbc-accent-secondary) 100%);
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 500;
  font-size: 14px;
  transition: all var(--tbc-transition-speed);
  box-shadow: 0 2px 4px rgba(0, 102, 204, 0.2);
}

#tbc-welcome-link a:hover {
  background: linear-gradient(135deg, var(--tbc-accent-secondary) 0%, var(--tbc-accent-highlight) 100%);
  box-shadow: 0 4px 8px rgba(0, 102, 204, 0.3);
  transform: translateY(-1px);
}

.tbc-welcome-icon {
  font-size: 16px;
}

/* ================================
   Sidebar Footer (Nav Links)
   ================================ */
#tbc-sidebar-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--tbc-sidebar-border);
  padding: 8px 12px;
  background: var(--tbc-sidebar-bg-light);
}

#tbc-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  justify-content: center;
}

#tbc-nav-links a {
  display: inline-block;
  padding: 4px 8px;
  font-size: 12px;
  color: var(--tbc-sidebar-text-muted);
  text-decoration: none;
  border-radius: 3px;
  transition: background var(--tbc-transition-speed), color var(--tbc-transition-speed);
}

#tbc-nav-links a:hover {
  background: var(--tbc-sidebar-hover);
  color: var(--tbc-sidebar-text);
}

#tbc-nav-links a.active {
  background: var(--tbc-sidebar-active);
  color: #fff;
  font-weight: 500;
}

#tbc-sidebar-footer .tbc-shortcut-hint {
  text-align: center;
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--tbc-sidebar-border);
}

/* ================================
   Topics Container (Scrollable)
   ================================ */
#tbc-topics-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 10px 0;
}

/* Custom scrollbar */
#tbc-topics-container::-webkit-scrollbar {
  width: 8px;
}

#tbc-topics-container::-webkit-scrollbar-track {
  background: var(--tbc-sidebar-bg);
}

#tbc-topics-container::-webkit-scrollbar-thumb {
  background: var(--tbc-sidebar-border);
  border-radius: 4px;
}

#tbc-topics-container::-webkit-scrollbar-thumb:hover {
  background: var(--tbc-sidebar-hover);
}

/* ================================
   Section Headers (Topics/Archive)
   ================================ */
.tbc-section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--tbc-sidebar-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--tbc-sidebar-border);
  margin-bottom: 4px;
  position: sticky;
  top: 0;
  background: var(--tbc-sidebar-bg);
  z-index: 5;
}

.tbc-section-icon {
  font-size: 14px;
}

.tbc-section-title {
  flex: 1;
}

.tbc-section-count {
  font-weight: 400;
  font-size: 11px;
  color: var(--tbc-sidebar-text-muted);
}

.tbc-toggle-all {
  background: none;
  border: 1px solid var(--tbc-sidebar-border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  font-weight: bold;
  color: var(--tbc-sidebar-text-muted);
  padding: 2px 8px;
  transition: all var(--tbc-transition-speed);
}

.tbc-toggle-all:hover {
  background: var(--tbc-sidebar-hover);
  color: var(--tbc-sidebar-text);
}

.tbc-topics-section {
  margin-bottom: 8px;
}

/* ================================
   Topic Groups
   ================================ */
.tbc-topic {
  margin-bottom: 2px;
}

.tbc-topic-header {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  cursor: pointer;
  transition: background var(--tbc-transition-speed);
  user-select: none;
}

.tbc-topic-header:hover {
  background: var(--tbc-sidebar-hover);
}

.tbc-topic-toggle {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  font-size: 10px;
  color: var(--tbc-sidebar-text-muted);
  transition: transform var(--tbc-transition-speed);
  flex-shrink: 0;
}

.tbc-topic.expanded .tbc-topic-toggle {
  transform: rotate(90deg);
}

.tbc-topic-title {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  color: var(--tbc-sidebar-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tbc-topic-id {
  color: var(--tbc-sidebar-text-muted);
  font-size: 11px;
  font-weight: normal;
  margin-right: 6px;
}

.tbc-topic-count {
  font-size: 11px;
  color: var(--tbc-sidebar-text-muted);
  margin-left: 8px;
  flex-shrink: 0;
}

/* ================================
   Topic Posts List
   ================================ */
.tbc-topic-posts {
  display: none;
  padding-left: 20px;
  background: rgba(0, 0, 0, 0.1);
}

.tbc-topic.expanded .tbc-topic-posts {
  display: block;
}

.tbc-post-link {
  display: block;
  padding: 6px 12px 6px 20px;
  color: var(--tbc-sidebar-text-muted);
  text-decoration: none;
  font-size: 12px;
  border-left: 2px solid transparent;
  transition: all var(--tbc-transition-speed);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tbc-post-link:hover {
  color: #fff;
  background: var(--tbc-sidebar-hover);
  border-left-color: var(--tbc-sidebar-active);
}

.tbc-post-link.current {
  color: #fff;
  background: var(--tbc-sidebar-active);
  border-left-color: #fff;
  font-weight: 500;
}

/* ================================
   Sub-Topics
   ================================ */
.tbc-subtopic {
  margin-left: 10px;
}

.tbc-subtopic .tbc-topic-header {
  padding-left: 20px;
}

.tbc-subtopic .tbc-topic-title {
  font-size: 12px;
}

/* ================================
   Search Highlighting
   ================================ */
.tbc-search-highlight {
  background-color: var(--tbc-search-highlight);
  color: #1f2328;
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

.tbc-search-no-match {
  display: none !important;
}

/* ================================
   Mobile Toggle Button
   ================================ */
#tbc-mobile-toggle {
  display: none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1002;
  width: 44px;
  height: 44px;
  background: var(--tbc-sidebar-bg);
  border: 1px solid var(--tbc-sidebar-border);
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(31, 35, 40, 0.12);
  color: var(--tbc-sidebar-text);
  font-size: 24px;
  display: none;
  align-items: center;
  justify-content: center;
}

#tbc-mobile-toggle:hover {
  background: var(--tbc-sidebar-hover);
}

/* Mobile close button in sidebar */
#tbc-sidebar-close {
  display: none;
  position: absolute;
  top: 10px;
  right: 10px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--tbc-sidebar-text);
  font-size: 20px;
  border-radius: 4px;
  z-index: 10;
}

#tbc-sidebar-close:hover {
  background: var(--tbc-sidebar-hover);
}

/* ================================
   Keyboard Shortcut Hint
   ================================ */
.tbc-shortcut-hint {
  font-size: 11px;
  color: var(--tbc-sidebar-text-muted);
  text-align: center;
  padding: 4px;
}

.tbc-shortcut-hint kbd {
  background: var(--tbc-sidebar-bg);
  border: 1px solid var(--tbc-sidebar-border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: monospace;
  font-size: 11px;
}

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

/* Tablet: Collapsible sidebar */
@media (max-width: 1024px) {
  :root {
    --tbc-sidebar-width: 260px;
  }
}

/* Mobile: Hidden sidebar with hamburger */
@media (max-width: 768px) {
  #tbc-sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    width: 85%;
    max-width: 320px;
  }
  
  #tbc-sidebar.open {
    transform: translateX(0);
  }
  
  #tbc-content {
    margin-left: 0 !important;
    padding: 60px 15px 15px 15px; /* Top padding for mobile toggle button */
  }
  
  #tbc-content article,
  #tbc-content > .nav,
  #tbc-content > article {
    max-width: none;
  }
  
  #tbc-mobile-toggle {
    display: flex;
  }
  
  #tbc-sidebar-close {
    display: block;
  }
  
  #tbc-resize-handle {
    display: none;
  }
  
  /* Overlay when sidebar is open */
  #tbc-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
  }
  
  #tbc-overlay.active {
    display: block;
  }
  
  .tbc-shortcut-hint {
    display: none;
  }
}

/* ================================
   Print Styles
   ================================ */
@media print {
  #tbc-sidebar,
  #tbc-mobile-toggle,
  #tbc-overlay {
    display: none !important;
  }
  
  #tbc-content {
    margin-left: 0 !important;
  }
}

/* ================================
   Accessibility
   ================================ */
.tbc-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
#tbc-sidebar a:focus,
#tbc-sidebar button:focus,
.tbc-topic-header:focus {
  outline: 2px solid var(--tbc-sidebar-active);
  outline-offset: -2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
  
  #tbc-sidebar,
  .tbc-topic-toggle {
    transition: none !important;
  }
}

/* ================================
   Loading State
   ================================ */
#tbc-sidebar.loading #tbc-topics-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.tbc-loading-spinner {
  width: 30px;
  height: 30px;
  border: 3px solid var(--tbc-sidebar-border);
  border-top-color: var(--tbc-sidebar-active);
  border-radius: 50%;
  animation: tbc-spin 0.8s linear infinite;
}

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

/* ================================
   Error State
   ================================ */
.tbc-error {
  padding: 20px;
  text-align: center;
  color: #fc8181;
}

.tbc-error-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.tbc-error-message {
  font-size: 13px;
  margin-bottom: 15px;
}

.tbc-retry-btn {
  background: var(--tbc-sidebar-hover);
  color: var(--tbc-sidebar-text);
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

.tbc-retry-btn:hover {
  background: var(--tbc-sidebar-active);
}
/* ================================
   Code Block Copy Button
   ================================ */
.tbc-code-wrapper {
  position: relative;
}

.tbc-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, background-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  z-index: 10;
}

.tbc-code-wrapper:hover .tbc-copy-btn {
  opacity: 1;
}

.tbc-copy-btn:hover {
  background: #f0f0f0;
  color: #333;
}

.tbc-copy-btn:active {
  background: #e0e0e0;
}

.tbc-copy-btn.tbc-copy-success {
  background: #d4edda;
  border-color: #28a745;
  color: #28a745;
}

.tbc-copy-btn svg {
  display: block;
}

/* Ensure pre elements work well with wrapper */
.tbc-code-wrapper pre {
  margin: 0 0 1em 0;
}

/* ================================
   CHRONOLOGICAL TIMELINE COLUMN
   Integrated right-side navigation
   ================================ */

/* CSS Variables for Timeline */
:root {
  --tbc-chrono-width: 150px;
  --tbc-chrono-gap: 30px;
  --tbc-chrono-text: #6b7280;
  --tbc-chrono-text-muted: #9ca3af;
  --tbc-chrono-link: #4b5563;
  --tbc-chrono-link-hover: #2563eb;
}

/* Content wrapper - flexbox layout for content + timeline */
.tbc-content-wrapper {
  display: flex;
  gap: var(--tbc-chrono-gap);
  padding: 20px;
  padding-right: 20px;
}

/* Main blog content - MAXIMIZED, no max-width */
.tbc-blog-content {
  flex: 1;
  min-width: 0;  /* Allow flex shrinking */
}

/* Ensure article inside content has readable max-width on very wide screens */
.tbc-blog-content article {
  max-width: 900px;
}

/* Right column - integrated, minimal footprint */
.tbc-chrono-column {
  width: var(--tbc-chrono-width);
  flex-shrink: 0;
  background: transparent;  /* Same as content area */
  border: none;
  padding-top: 20px;
  font-size: 13px;
  color: var(--tbc-chrono-text);
  line-height: 1.8;
}

/* Sticky positioning for timeline nav */
.tbc-chrono-nav {
  position: sticky;
  top: 20px;
}

/* Section labels - subtle uppercase */
.tbc-chrono-section-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--tbc-chrono-text-muted);
  margin-bottom: 12px;
  display: block;
  font-weight: 500;
}

/* Previous/Next navigation */
.tbc-chrono-prevnext {
  margin-bottom: 24px;
}

.tbc-chrono-prev,
.tbc-chrono-next {
  display: block;
  margin-bottom: 16px;
  text-decoration: none;
  color: var(--tbc-chrono-link);
  transition: color 0.15s ease;
}

.tbc-chrono-prev:hover,
.tbc-chrono-next:hover {
  color: var(--tbc-chrono-link-hover);
}

.tbc-chrono-label {
  display: block;
  font-size: 11px;
  color: var(--tbc-chrono-text-muted);
  margin-bottom: 2px;
}

.tbc-chrono-title {
  display: block;
  font-size: 12px;
  line-height: 1.4;
  /* Truncate long titles */
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* Current post indicator */
.tbc-chrono-current {
  margin-bottom: 24px;
  padding: 8px 10px;
  background: #f3f4f6;
  border-radius: 4px;
  border-left: 3px solid var(--tbc-accent-primary);
}

.tbc-chrono-current .tbc-chrono-label {
  color: var(--tbc-accent-primary);
  font-weight: 500;
}

.tbc-chrono-current .tbc-chrono-num {
  font-size: 12px;
  color: var(--tbc-chrono-text);
}

/* Year browser */
.tbc-chrono-years {
  margin-top: 16px;
}

.tbc-chrono-years ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tbc-chrono-years li {
  margin-bottom: 4px;
}

.tbc-chrono-year-item {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.tbc-chrono-year-link {
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--tbc-chrono-link);
  text-decoration: none;
  cursor: pointer;
}

.tbc-chrono-year-link:hover {
  color: var(--tbc-chrono-link-hover);
  text-decoration: underline;
}

.tbc-chrono-year-count {
  font-size: 11px;
  color: var(--tbc-chrono-text-muted);
}

/* Expanded year - posts list */
.tbc-chrono-year-posts {
  list-style: none;
  margin: 6px 0 12px 12px;
  padding: 0;
  display: none;
}

.tbc-chrono-year-posts.expanded {
  display: block;
}

.tbc-chrono-year-posts li {
  margin-bottom: 3px;
}

.tbc-chrono-post-link {
  font-size: 11px;
  color: var(--tbc-chrono-text-muted);
  text-decoration: none;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tbc-chrono-post-link:hover {
  color: var(--tbc-chrono-link-hover);
}

.tbc-chrono-post-link.current {
  color: var(--tbc-accent-primary);
  font-weight: 500;
}

/* Divider */
.tbc-chrono-divider {
  border: none;
  border-top: 1px solid #e5e7eb;
  margin: 16px 0;
}

/* ================================
   Responsive: Timeline Column
   ================================ */

/* Hide timeline on narrower screens, move to bottom */
@media (max-width: 1000px) {
  .tbc-content-wrapper {
    flex-direction: column;
  }
  
  .tbc-chrono-column {
    width: 100%;
    padding-top: 0;
    margin-top: 30px;
    border-top: 1px solid #e5e7eb;
    padding-top: 24px;
  }
  
  .tbc-chrono-nav {
    position: static;
  }
  
  /* Horizontal prev/next layout */
  .tbc-chrono-prevnext {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 20px;
  }
  
  .tbc-chrono-prev,
  .tbc-chrono-next {
    flex: 1;
    margin-bottom: 0;
  }
  
  .tbc-chrono-next {
    text-align: right;
  }
  
  /* Horizontal year browser */
  .tbc-chrono-years ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
  }
  
  .tbc-chrono-years li {
    margin-bottom: 0;
  }
}

/* When sidebar is collapsed on mobile, full width content */
@media (max-width: 768px) {
  .tbc-content-wrapper {
    padding: 15px;
  }
  
  .tbc-chrono-prevnext {
    flex-direction: column;
    gap: 12px;
  }
  
  .tbc-chrono-next {
    text-align: left;
  }
}

/* Print: hide timeline */
@media print {
  .tbc-chrono-column {
    display: none;
  }
}