/* ===== MOBILE-FIRST RESPONSIVE DESIGN ===== */

/* Root Variables */
:root {
  --primary-color: #0d6efd;
  --secondary-color: #6c757d;
  --success-color: #198754;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #0dcaf0;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --white: #ffffff;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  
  /* Layout Variables */
  --mobile-header-height: 56px;
  --sidebar-width-mobile: 280px;
  --sidebar-width-desktop: 300px;
  --toc-width: 280px;
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  --box-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  --box-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  
  /* Typography */
  --font-family-base: 'Segoe UI', system-ui, -apple-system, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --line-height-base: 1.6;
  --line-height-sm: 1.4;
  --line-height-lg: 1.8;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Animation */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset any potential layout issues */
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* Account for fixed elements */
  overflow-x: hidden;
  overflow-y: auto; /* Ensure vertical scrolling is always possible */
}

html, body {
  overflow-x: hidden;
}

body {
  /* Ensure body can always be scrolled */
  overflow-y: auto;
  scroll-behavior: smooth;
}

/* Dark Mode Variables */
[data-bs-theme="dark"] {
  --primary-color: #6ea8fe;
  --light-color: #1e1e1e;
  --white: #2d2d2d;
  --gray-100: #2d2d2d;
  --gray-200: #404040;
  --gray-300: #555555;
  --gray-400: #6c757d;
  --gray-500: #adb5bd;
  --gray-600: #ced4da;
  --gray-700: #dee2e6;
  --gray-800: #e9ecef;
  --gray-900: #f8f9fa;
}

/* ===== BASE STYLES ===== */

body {
  font-family: var(--font-family-base);
  background-color: var(--gray-100);
  color: var(--gray-900);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

* {
  box-sizing: border-box;
}

/* ===== LAYOUT GRID STRUCTURE ===== */

.layout-container {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas: "content";
  min-height: 100vh;
  gap: 0;
  contain: layout style;
  margin: 0;
  padding: 0;
  /* Ensure layout doesn't prevent document scrolling */
  position: relative;
  overflow: visible;
}

.container-fluid {
  display: contents;
  margin: 0;
  padding: 0;
}

.row {
  display: contents;
  margin: 0;
}

.col-lg-3,
.col-xl-2,
.col-lg-6,
.col-xl-7,
.col-xl-3 {
  /* Remove Bootstrap column styles to allow grid to work */
  width: auto;
  flex: none;
  max-width: none;
  padding-right: 0;
  padding-left: 0;
  margin-left: 0;
  margin-right: 0;
}

/* ===== DESKTOP TOGGLE CONTAINER ===== */

.desktop-toggle-container {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
  background-color: var(--white);
}

/* Hide desktop toggle when sidebar is collapsed */
.layout-container.sidebar-collapsed .desktop-toggle-container {
  display: none;
}

.desktop-toggle-container .btn {
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  transition: var(--transition-base);
  padding: var(--spacing-sm);
  font-size: var(--font-size-sm);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.desktop-toggle-container .btn:hover,
.desktop-toggle-container .btn:focus {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--box-shadow-sm);
}

/* ===== FLOATING SIDEBAR TOGGLE ===== */

.floating-sidebar-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  border: none;
  box-shadow: var(--box-shadow);
  z-index: 1040;
  display: none; /* Hidden by default */
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.8);
}

.floating-sidebar-toggle:hover {
  background-color: var(--primary-color);
  transform: scale(1.1);
  box-shadow: var(--box-shadow-lg);
}

.floating-sidebar-toggle i {
  font-size: 1.2rem;
}

/* Show floating button ONLY when sidebar is collapsed */
.layout-container.sidebar-collapsed .floating-sidebar-toggle {
  display: flex;
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

/* Ensure floating button is hidden when sidebar is visible */
.layout-container:not(.sidebar-collapsed) .floating-sidebar-toggle {
  display: none;
  opacity: 0;
  visibility: hidden;
}

/* ===== MOBILE HEADER (REMOVED) ===== */

/* Mobile header is completely removed for simplified mobile layout */
.mobile-header {
  display: none !important;
}

/* Remove mobile header height variable usage on mobile */
@media (max-width: 991.98px) {
  :root {
    --mobile-header-height: 0px;
  }
}

/* ===== SIDEBAR NAVIGATION ===== */

.sidebar-nav {
  background-color: var(--white);
  height: 100vh;
  z-index: 1020;
  overflow-y: auto;
  box-shadow: none;
  contain: layout style;
  border: none;
  margin: 0;
  padding: 0;
}

/* Mobile sidebar behavior - direct access, no offcanvas */
@media (max-width: 991.98px) {
  .sidebar-nav {
    position: static;
    width: 100%;
    height: auto;
    min-height: 100vh;
    transform: none;
    transition: none;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid var(--gray-200);
  }
  
  .sidebar-nav.mobile-direct-access {
    display: block;
    visibility: visible;
  }
  
  .sidebar-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), #4c84ff);
    color: white;
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
  }
  
  .sidebar-header .sidebar-title {
    color: white;
    margin: 0;
    font-size: 1.1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  }
}

/* Desktop sidebar behavior */
@media (min-width: 992px) {
  .sidebar-nav {
    grid-area: sidebar;
    position: static;
    transform: none;
    width: 100%;
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
  }
  
  .sidebar-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
  }
}

.sidebar-content {
  height: 100%;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-400) transparent;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
  background-color: var(--gray-400);
  border-radius: 3px;
}

/* Search Container */
.search-container {
  border-bottom: 1px solid var(--gray-200);
  background-color: var(--white);
  margin: 0;
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md) var(--spacing-lg);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  flex-shrink: 0;
}

.search-header h6 {
  margin: 0;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary-color);
}

.search-container .input-group {
  width: 100%;
}

.search-container .input-group-text {
  background-color: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-right: none;
  color: var(--gray-600);
  padding: var(--spacing-sm) var(--spacing-md);
}

.search-container .form-control {
  border: 1px solid var(--gray-300);
  border-left: none;
  background-color: var(--white);
  transition: var(--transition-base);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
}

.search-container .form-control:focus {
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
  border-color: var(--primary-color);
}

.search-container .form-control:focus + .input-group-text,
.search-container .form-control:focus ~ .input-group-text {
  border-color: var(--primary-color);
}

/* Navigation Items */
.nav-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
  background-color: var(--white);
}

.topics-header {
  margin: 0 0 var(--spacing-md) 0;
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--gray-200);
}

.topics-header h6 {
  margin: 0;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary-color);
  font-weight: 600;
}

.nav-pills .nav-link {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  border-radius: var(--border-radius);
  color: var(--gray-700);
  text-decoration: none;
  transition: var(--transition-base);
  font-weight: 500;
  font-size: var(--font-size-sm);
  min-height: auto;
  display: block;
  border: 1px solid var(--gray-200);
  background-color: var(--white);
}

.nav-pills .nav-link:hover {
  background-color: rgba(13, 110, 253, 0.05);
  color: var(--primary-color);
  border-color: rgba(13, 110, 253, 0.2);
  transform: translateY(-1px);
  box-shadow: var(--box-shadow-sm);
}

.nav-pills .nav-link.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  box-shadow: var(--box-shadow);
}

/* Enhanced topic cards */
.topic-card {
  display: block;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
  background-color: var(--white);
  transition: var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.topic-card:hover {
  background-color: rgba(13, 110, 253, 0.05);
  border-color: rgba(13, 110, 253, 0.2);
  transform: translateY(-1px);
  box-shadow: var(--box-shadow-sm);
  text-decoration: none;
  color: inherit;
}

.topic-card.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  box-shadow: var(--box-shadow);
}

.topic-card.active:hover {
  background-color: var(--primary-color);
  color: white;
}

.topic-title {
  font-weight: 600;
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xs);
  line-height: var(--line-height-sm);
  color: inherit;
}

.topic-description {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
  color: var(--gray-600);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-card.active .topic-description {
  color: rgba(255, 255, 255, 0.9);
}

.topic-card:hover .topic-description {
  color: var(--gray-700);
}

.topic-card.active:hover .topic-description {
  color: rgba(255, 255, 255, 0.9);
}

/* ===== MAIN CONTENT ===== */

.main-content {
  background-color: var(--white);
  min-height: 100vh;
  min-width: 0;
  padding: var(--spacing-xl);
  overflow-x: hidden;
  contain: layout style;
  scroll-behavior: smooth;
}

/* Ensure headings have proper scroll margin */
.main-content h1,
.main-content h2,
.main-content h3,
.main-content h4,
.main-content h5,
.main-content h6,
.content-area h1,
.content-area h2,
.content-area h3,
.content-area h4,
.content-area h5,
.content-area h6,
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  scroll-margin-top: 80px;
  scroll-margin-bottom: 20px;
  position: relative;
}

/* Highlight animation for scroll-to targets */
.main-content h1:target,
.main-content h2:target,
.main-content h3:target,
.main-content h4:target,
.main-content h5:target,
.main-content h6:target,
.content-area h1:target,
.content-area h2:target,
.content-area h3:target,
.content-area h4:target,
.content-area h5:target,
.content-area h6:target,
.markdown-body h1:target,
.markdown-body h2:target,
.markdown-body h3:target,
.markdown-body h4:target,
.markdown-body h5:target,
.markdown-body h6:target {
  animation: targetHighlight 2s ease-in-out;
}

@keyframes targetHighlight {
  0% {
    background-color: rgba(13, 110, 253, 0.1);
    border-left: 4px solid var(--primary-color);
    padding-left: 8px;
  }
  100% {
    background-color: transparent;
    border-left: 4px solid transparent;
    padding-left: 0;
  }
}

/* TOC target highlight class */
.toc-target-highlight {
  animation: targetHighlight 3s ease-in-out;
  transition: all 0.3s ease;
}

/* Enhanced target highlighting for better visibility */
.toc-target-highlight::before {
  content: '\1F4CD'; /* 📍 pin emoji */
  position: absolute;
  left: -25px;
  color: var(--primary-color);
  font-size: 1.2em;
  animation: fadeInOut 3s ease-in-out;
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0; transform: scale(0.8); }
  15%, 85% { opacity: 1; transform: scale(1); }
}

/* Content Area for Desktop */
.content-area {
  background-color: var(--white);
  min-height: 100vh;
  min-width: 0;
  padding: var(--spacing-xl);
  overflow-x: hidden;
  contain: layout style;
  border-left: 1px solid var(--gray-200);
  scroll-behavior: smooth;
  position: relative;
}

.content-area .content-wrapper {
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-xl);
  transition: max-width var(--transition-base);
}

/* When sidebar is collapsed, allow content to expand more */
.layout-container.sidebar-collapsed .content-area .content-wrapper {
  max-width: 1200px;
}

.info-cards .card {
  transition: var(--transition-base);
  border: 1px solid var(--gray-200);
}

.info-cards .card:hover {
  transform: translateY(-2px);
  box-shadow: var(--box-shadow);
}

/* Mobile main content adjustments */
@media (max-width: 991.98px) {
  .main-content {
    padding-top: var(--spacing-md); /* Remove mobile header padding */
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
  }
  
  /* Hide welcome content completely on mobile */
  .welcome-content {
    display: none !important;
  }
}

/* Desktop main content behavior */
@media (min-width: 992px) {
  .main-content {
    grid-area: content;
  }
}

.content-wrapper {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  padding: var(--spacing-md);
}

/* Ensure proper content flow */
.welcome-content {
  text-align: center;
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
}

.welcome-content .display-4 {
  background: linear-gradient(135deg, var(--primary-color), #4c84ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
}

.welcome-content .lead {
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  color: var(--gray-600);
}

/* ===== MOBILE CONTENT AREA ===== */

.mobile-content-area {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--white);
  z-index: 1060;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-content-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--white);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: var(--box-shadow-sm);
  position: sticky;
  top: 0;
  z-index: 10;
}

.mobile-back-button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-right: var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: var(--transition-base);
  min-height: 40px;
}

.mobile-back-button:hover {
  background-color: #0056b3;
  transform: translateY(-1px);
  box-shadow: var(--box-shadow-sm);
}

.mobile-content-title {
  margin: 0;
  color: var(--gray-800);
  font-size: var(--font-size-base);
  font-weight: 600;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mobile-content-wrapper {
  flex: 1;
  padding: var(--spacing-lg);
  max-width: 100%;
  overflow-x: hidden;
}



/* ===== MOBILE BOTTOM NAVIGATION ===== */

.mobile-bottom-navigation {
  padding: var(--spacing-lg);
  background: white;
  border-top: 1px solid var(--gray-200);
  position: sticky;
  bottom: 0;
  z-index: 10;
  box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

.mobile-bottom-back-button {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-height: 48px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.mobile-bottom-back-button:hover {
  background: #0056b3;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.mobile-bottom-back-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* ===== MOBILE LAYOUT STRUCTURE ===== */

@media (max-width: 991.98px) {
  .layout-container {
    display: block;
    grid-template-areas: none;
    grid-template-columns: none;
  }
  
  /* Mobile layout shows sidebar by default */
  .sidebar-nav {
    position: static;
    display: block;
    width: 100%;
    height: auto;
    min-height: 100vh;
  }
  
  /* Hide desktop content area on mobile */
  .content-area,
  .toc-panel {
    display: none !important;
  }
  
  /* Make search container sticky at top */
  .search-container {
    position: sticky;
    top: 0;
    z-index: 20;
    margin: 0;
    border-radius: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }
}

/* ===== TABLE OF CONTENTS ===== */

.toc-panel {
  background-color: var(--white);
  height: 100vh;
  z-index: 1010;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: none;
  contain: layout style;
  border: none;
  margin: 0;
}

/* Desktop TOC behavior */
@media (min-width: 992px) {
  .toc-panel {
    display: block;
    grid-area: toc;
    position: static;
    border-left: 1px solid var(--gray-200);
  }
}

.toc-wrapper {
  position: sticky;
  top: var(--spacing-lg);
}

.toc-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--primary-color);
}

.toc-nav {
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-400) transparent;
}

.toc-nav::-webkit-scrollbar {
  width: 4px;
}

.toc-nav::-webkit-scrollbar-track {
  background: transparent;
}

.toc-nav::-webkit-scrollbar-thumb {
  background-color: var(--gray-400);
  border-radius: 2px;
}

.toc-nav a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  color: var(--gray-700);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-base);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-sm);
  border-left: 3px solid transparent;
}

.toc-nav a:hover {
  background-color: rgba(13, 110, 253, 0.1);
  color: var(--primary-color);
  border-left-color: var(--primary-color);
  transform: translateX(2px);
}

.toc-nav a.active {
  background-color: var(--primary-color);
  color: white;
  border-left-color: white;
}

/* ===== MOBILE TOC MODAL ===== */

.mobile-toc-nav {
  padding: var(--spacing-md);
}

.mobile-toc-nav a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-xs);
  color: var(--gray-700);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-base);
  min-height: 44px;
  display: flex;
  align-items: center;
  border: 1px solid transparent;
}

.mobile-toc-nav a:hover {
  background-color: rgba(13, 110, 253, 0.1);
  color: var(--primary-color);
  border-color: rgba(13, 110, 253, 0.2);
}

.mobile-toc-nav a.active {
  background-color: var(--primary-color);
  color: white;
}

/* ===== FLOATING ACTION BUTTON ===== */

.mobile-toc-fab {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1025;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  box-shadow: var(--box-shadow-lg);
  border: none;
  transition: var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-toc-fab:hover {
  transform: scale(1.1) translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.mobile-toc-fab:active {
  transform: scale(0.95);
}

/* ===== RESPONSIVE BREAKPOINTS ===== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
  .main-content {
    padding: var(--spacing-lg);
  }
  
  .welcome-content {
    margin: var(--spacing-xxl) 0;
  }
}

/* Desktop (992px and up) */
@media (min-width: 992px) {
  /* Show desktop layout - 3 column: sidebar, content, toc */
  .layout-container {
    grid-template-columns: 
      [sidebar-start] 300px 
      [content-start] 1fr 
      [toc-start] 250px [toc-end];
    grid-template-areas: "sidebar content toc";
    gap: 0;
    width: 100vw;
    max-width: 100vw;
    min-height: 100vh;
    overflow-x: hidden;
    transition: grid-template-columns 0.3s ease;
  }
  
  .layout-container.sidebar-collapsed {
    grid-template-columns: 
      [content-start] 1fr 
      [toc-start] 250px [toc-end];
    grid-template-areas: "content toc";
  }
  
  .sidebar-nav {
    display: block !important;
    position: static;
    transform: none;
    width: 100%;
    height: 100vh;
    box-shadow: none;
    grid-area: sidebar;
    overflow-y: auto;
    overflow-x: hidden;
    transition: all var(--transition-base);
  }
  
  .layout-container.sidebar-collapsed .sidebar-nav {
    display: none;
    width: 0;
    overflow: hidden;
  }
  
  .content-area {
    display: block !important;
    grid-area: content;
    position: static;
    width: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    height: 100vh;
    background-color: var(--white);
    transition: all var(--transition-base);
    /* Ensure content can be scrolled */
    scroll-behavior: smooth;
  }
  
  .main-content {
    display: none; /* Hide mobile main content on desktop */
  }
  
  .toc-panel {
    display: block !important;
    grid-area: toc;
    position: static;
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    /* Ensure TOC clicks are not blocked */
    pointer-events: auto;
    z-index: auto;
  }
}

/* Large Desktop (1200px and up) */
@media (min-width: 1200px) {
  .layout-container {
    grid-template-columns: 
      320px 
      1fr 
      280px;
    max-width: 1600px;
    margin: 0 auto;
    gap: 0;
  }
  
  .layout-container.sidebar-collapsed {
    grid-template-columns: 
      1fr 
      300px;
    grid-template-areas: "content toc";
  }
}



/* ===== MARKDOWN CONTENT STYLES ===== */

.markdown-body {
  font-family: var(--font-family-base);
  line-height: var(--line-height-lg);
  color: var(--gray-900);
  max-width: 100%;
  word-wrap: break-word;
  padding: var(--spacing-md);
  /* Ensure content is visible and properly flows */
  opacity: 1;
  transform: none;
  min-height: 200px;
}

/* Content loading states */
.content-wrapper.loading {
  opacity: 0.7;
  pointer-events: none;
}

.content-wrapper.loaded {
  opacity: 1;
  transition: opacity var(--transition-base);
}

/* Ensure the main content has proper height */
#postContent {
  min-height: 400px;
  width: 100%;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: var(--line-height-sm);
  scroll-margin-top: calc(var(--mobile-header-height) + var(--spacing-lg));
  color: var(--gray-900);
}

.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child {
  margin-top: 0;
}

.markdown-body h1 {
  font-size: 2rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.markdown-body h2 {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.markdown-body h3 {
  font-size: 1.25rem;
  color: var(--gray-800);
}

.markdown-body h4 {
  font-size: 1.125rem;
}

.markdown-body p {
  margin-bottom: var(--spacing-md);
  text-align: justify;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.markdown-body li {
  margin-bottom: var(--spacing-xs);
}

.markdown-body blockquote {
  border-left: 4px solid var(--primary-color);
  background-color: var(--gray-100);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  border-radius: var(--border-radius-sm);
  font-style: italic;
}

.markdown-body code {
  background-color: var(--gray-200);
  color: var(--gray-800);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  font-size: 0.875em;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  word-break: break-word;
  border: 1px solid var(--gray-300);
}

.markdown-body pre {
  background-color: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  line-height: var(--line-height-base);
}

.markdown-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: var(--font-size-sm);
  color: inherit;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  font-size: var(--font-size-sm);
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--gray-300);
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
}

.markdown-body th {
  background-color: var(--gray-100);
  font-weight: 600;
  color: var(--gray-800);
}

.markdown-body tr:nth-child(even) {
  background-color: var(--gray-50, #fafafa);
}

.markdown-body a {
  color: var(--primary-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.markdown-body a:hover {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-sm);
  margin: var(--spacing-md) 0;
}

.markdown-body hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gray-300), transparent);
  margin: var(--spacing-xl) 0;
}

/* Mobile optimizations for markdown content */
@media (max-width: 767.98px) {
  .markdown-body {
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
  }
  
  .markdown-body h1 {
    font-size: 1.5rem;
    scroll-margin-top: calc(var(--mobile-header-height) + var(--spacing-xl));
  }
  
  .markdown-body h2 {
    font-size: 1.25rem;
  }
  
  .markdown-body h3 {
    font-size: 1.125rem;
  }
  
  .markdown-body h4 {
    font-size: 1rem;
  }
  
  .markdown-body ul,
  .markdown-body ol {
    padding-left: var(--spacing-lg);
  }
  
  .markdown-body pre {
    padding: var(--spacing-sm);
    font-size: 0.8rem;
    overflow-x: scroll;
  }
  
  .markdown-body code {
    font-size: 0.8rem;
  }
  
  .markdown-body blockquote {
    padding: var(--spacing-sm);
    margin: var(--spacing-md) 0;
  }
  
  .markdown-body table {
    font-size: 0.8rem;
  }
  
  .markdown-body th,
  .markdown-body td {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}

/* ===== DARK MODE STYLES ===== */

[data-bs-theme="dark"] body,
body.dark-mode {
  background-color: #121212;
  color: #f8f9fa;
}

[data-bs-theme="dark"] .mobile-header,
body.dark-mode .mobile-header {
  background: linear-gradient(135deg, #1a365d, #2c5282);
  border-bottom-color: #4a5568;
}

[data-bs-theme="dark"] .sidebar-nav,
body.dark-mode .sidebar-nav {
  background-color: #1e1e1e;
  border-right-color: #4a5568;
}

[data-bs-theme="dark"] .search-container,
body.dark-mode .search-container {
  background-color: #2d2d2d;
  border-bottom-color: #4a5568;
}

[data-bs-theme="dark"] .search-container .form-control,
body.dark-mode .search-container .form-control {
  background-color: #2d2d2d;
  border-color: #4a5568;
  color: #f8f9fa;
}

[data-bs-theme="dark"] .search-container .form-control:focus,
body.dark-mode .search-container .form-control:focus {
  background-color: #2d2d2d;
  border-color: #6ea8fe;
  color: #f8f9fa;
  box-shadow: 0 0 0 0.2rem rgba(110, 168, 254, 0.25);
}

[data-bs-theme="dark"] .nav-pills .nav-link,
body.dark-mode .nav-pills .nav-link {
  color: #e2e8f0;
}

[data-bs-theme="dark"] .nav-pills .nav-link:hover,
body.dark-mode .nav-pills .nav-link:hover {
  background-color: rgba(110, 168, 254, 0.2);
  color: #6ea8fe;
  border-color: rgba(110, 168, 254, 0.3);
}

[data-bs-theme="dark"] .nav-pills .nav-link.active,
body.dark-mode .nav-pills .nav-link.active {
  background-color: #6ea8fe;
  color: #1e1e1e;
}

[data-bs-theme="dark"] .main-content,
body.dark-mode .main-content {
  background-color: #1e1e1e;
}

[data-bs-theme="dark"] .toc-panel,
body.dark-mode .toc-panel {
  background-color: #1e1e1e;
  border-left-color: #4a5568;
}

[data-bs-theme="dark"] .toc-nav a,
body.dark-mode .toc-nav a {
  color: #e2e8f0;
}

[data-bs-theme="dark"] .toc-nav a:hover,
body.dark-mode .toc-nav a:hover {
  background-color: rgba(110, 168, 254, 0.2);
  color: #6ea8fe;
  border-left-color: #6ea8fe;
}

[data-bs-theme="dark"] .toc-nav a.active,
body.dark-mode .toc-nav a.active {
  background-color: #6ea8fe;
  color: #1e1e1e;
  border-left-color: #1e1e1e;
}

[data-bs-theme="dark"] .mobile-toc-nav a,
body.dark-mode .mobile-toc-nav a {
  color: #e2e8f0;
}

[data-bs-theme="dark"] .mobile-toc-nav a:hover,
body.dark-mode .mobile-toc-nav a:hover {
  background-color: rgba(110, 168, 254, 0.2);
  color: #6ea8fe;
  border-color: rgba(110, 168, 254, 0.3);
}

[data-bs-theme="dark"] .mobile-toc-nav a.active,
body.dark-mode .mobile-toc-nav a.active {
  background-color: #6ea8fe;
  color: #1e1e1e;
}

[data-bs-theme="dark"] .modal-content,
body.dark-mode .modal-content {
  background-color: #1e1e1e;
  border-color: #4a5568;
}

[data-bs-theme="dark"] .modal-header,
body.dark-mode .modal-header {
  border-bottom-color: #4a5568;
}

/* Dark mode markdown content */
[data-bs-theme="dark"] .markdown-body,
body.dark-mode .markdown-body {
  color: #f8f9fa;
}

[data-bs-theme="dark"] .markdown-body h1,
[data-bs-theme="dark"] .markdown-body h2,
[data-bs-theme="dark"] .markdown-body h3,
[data-bs-theme="dark"] .markdown-body h4,
[data-bs-theme="dark"] .markdown-body h5,
[data-bs-theme="dark"] .markdown-body h6,
body.dark-mode .markdown-body h1,
body.dark-mode .markdown-body h2,
body.dark-mode .markdown-body h3,
body.dark-mode .markdown-body h4,
body.dark-mode .markdown-body h5,
body.dark-mode .markdown-body h6 {
  color: #f8f9fa;
}

[data-bs-theme="dark"] .markdown-body h2,
body.dark-mode .markdown-body h2 {
  color: #6ea8fe;
}

[data-bs-theme="dark"] .markdown-body h3,
body.dark-mode .markdown-body h3 {
  color: #e2e8f0;
}

[data-bs-theme="dark"] .markdown-body blockquote,
body.dark-mode .markdown-body blockquote {
  background-color: #2d2d2d;
  border-left-color: #6ea8fe;
}

[data-bs-theme="dark"] .markdown-body code,
body.dark-mode .markdown-body code {
  background-color: #2d2d2d;
  color: #f8f9fa;
  border-color: #4a5568;
}

[data-bs-theme="dark"] .markdown-body pre,
body.dark-mode .markdown-body pre {
  background-color: #2d2d2d;
  border-color: #4a5568;
}

[data-bs-theme="dark"] .markdown-body th,
body.dark-mode .markdown-body th {
  background-color: #2d2d2d;
  color: #f8f9fa;
}

[data-bs-theme="dark"] .markdown-body td,
body.dark-mode .markdown-body td {
  border-color: #4a5568;
}

[data-bs-theme="dark"] .markdown-body tr:nth-child(even),
body.dark-mode .markdown-body tr:nth-child(even) {
  background-color: #2d2d2d;
}

[data-bs-theme="dark"] .markdown-body a,
body.dark-mode .markdown-body a {
  color: #6ea8fe;
}

[data-bs-theme="dark"] .markdown-body a:hover,
body.dark-mode .markdown-body a:hover {
  color: #6ea8fe;
  border-bottom-color: #6ea8fe;
}

/* ===== PRINT STYLES ===== */

@media print {
  .mobile-header,
  .sidebar-nav,
  .toc-panel,
  .mobile-toc-fab {
    display: none !important;
  }
  
  .main-content {
    margin: 0;
    padding: 0;
    max-width: 100%;
  }
  
  .markdown-body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  .markdown-body h1,
  .markdown-body h2,
  .markdown-body h3 {
    page-break-after: avoid;
  }
  
  .markdown-body pre,
  .markdown-body blockquote {
    page-break-inside: avoid;
  }
}