/* ============================================
   CSS Variables - ICT Research Methods
   ============================================ */
:root {
  /* Color Palette - Primary */
  --color-primary: #4458e8;
  --color-primary-dark: #3345c7;
  --color-primary-light: #5569ff;
  
  /* Color Palette - Categories */
	--color-library: hsl(78, 55%, 52%);
	--color-library-light: hsl(78, 78%, 74%);

	--color-field: hsl(174, 41%, 55%);
	--color-field-light: hsl(174, 48%, 71%);

	--color-lab: hsl(261, 78%, 70%);
	--color-lab-light: hsl(245, 33%, 78%);

	--color-showroom: hsl(44, 93%, 66%);
	--color-showroom-light: hsl(44, 85%, 77%);

	--color-workshop: hsl(190, 82%, 45%);
	--color-workshop-light: hsl(190, 48%, 66%);

	--color-extra: hsl(198, 100%, 33%);
	--color-extra-light: hsl(198, 42%, 55%);
  
  /* Text Colors */
  --color-text-primary: #000000;
  --color-text-secondary: #757575;
  --color-text-light: #ffffff;
  --color-text-muted: #616161;
  
  /* Background Colors */
  --color-bg-body: #ffffff;
  --color-bg-header: #ffffff;
  --color-bg-nav: #f5f5f5;
  --color-bg-hover: #f0f0f0;
  --color-bg-card: #ffffff;
  --color-bg-subtle: #fafafa;
  --color-bg-search: #ffffff;
  
  /* Button Colors */
  --color-button-bg: #777777;
  --color-button-hover: #aaaaaa;
  
  /* Navigation Colors */
  --color-nav-submenu-bg: #f5f5f5;
  --color-nav-item-hover: #eeeeee;
  
  /* Badge Colors */
  --color-badge-bg: #eeeeee;
  --color-badge-text: #616161;
  
  /* Border Colors */
  --color-border: #e0e0e0;
  --color-border-light: #eeeeee;
  --color-border-dark: #000000;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  
  /* Font Sizes - Semantic */
  --font-heading-1: 2rem;
  --font-heading-2: 1.5rem;
  --font-heading-3: 1.25rem;
  --font-body: 1rem;
  --font-body-small: 0.875rem;
  --font-card-title: 1.125rem;
  --font-badge: 0.75rem;
  --font-button: 1rem;
  
  /* Font Weights - Semantic */
  --font-weight-body: 400;
  --font-weight-emphasis: 500;
  --font-weight-strong: 600;
  --font-weight-heading: 700;
  
  /* Line Heights - Semantic */
  --line-height-heading: 1.25;
  --line-height-body: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing - Semantic (keeping minimal set) */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius - Semantic */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-round: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  
  /* Layout */
  --max-width-container: 1200px;
  --header-height: 80px;
  --mobile-header-height: 150px;
}

/* Dark Mode - via class toggle */
body.dark-mode {
  --color-text-primary: #e8e8e8;
  --color-text-secondary: #a0a0a0;
  --color-text-light: #ffffff;
  --color-text-muted: #b0b0b0;
  
  --color-bg-body: #1a1a1a;
  --color-bg-header: #252525;
  --color-bg-nav: #2a2a2a;
  --color-bg-hover: #333333;
  --color-bg-card: #2a2a2a;
  --color-bg-subtle: #2a2a2a;
  --color-bg-search: #2a2a2a;
  
  --color-nav-submenu-bg: #333333;
  --color-nav-item-hover: #404040;
  
  --color-badge-bg: #404040;
  --color-badge-text: #b0b0b0;
  
  --color-border: #404040;
  --color-border-light: #333333;
  --color-border-dark: #4a4a4a;
}

/* Dark mode - card styling adjustments */
body.dark-mode a.set-card {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-primary) !important;
}

body.dark-mode .set-card {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-primary) !important;
}

body.dark-mode .card-summary-wrapper {
  background-color: transparent !important;
}

body.dark-mode .card-summary {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-primary) !important;
}

/* Dark mode - card content elements */
body.dark-mode .card-summary h2 {
  color: var(--color-text-primary) !important;
}

body.dark-mode .card-content {
  color: var(--color-text-primary) !important;
}

body.dark-mode .card-why {
  color: var(--color-text-secondary) !important;
}

body.dark-mode .card-why strong {
  color: var(--color-text-primary) !important;
}

body.dark-mode .card-more-info {
  color: var(--color-text-primary) !important;
}

body.dark-mode .badge {
  background-color: var(--color-badge-bg) !important;
  color: var(--color-text-primary) !important;
}

body.dark-mode .badge a {
  color: var(--color-primary-light) !important;
}

/* Dark mode - strategy specific card variants */
body.dark-mode .card-summary.library,
body.dark-mode .card-summary.field,
body.dark-mode .card-summary.lab,
body.dark-mode .card-summary.showroom,
body.dark-mode .card-summary.workshop,
body.dark-mode .card-summary.extra {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-primary) !important;
}

/* Dark mode - method list items (per phase, per strategy pages) */
body.dark-mode .method-list a {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-primary) !important;
}

body.dark-mode .method-list a.library,
body.dark-mode .method-list a.field,
body.dark-mode .method-list a.lab,
body.dark-mode .method-list a.showroom,
body.dark-mode .method-list a.workshop,
body.dark-mode .method-list a.extra {
  background-color: var(--color-bg-card) !important;
  border-color: var(--color-border) !important;
}

/* Dark mode - search input */
body.dark-mode header input[type="text"] {
  background-color: var(--color-bg-hover) !important;
  color: var(--color-text-primary) !important;
  border-color: var(--color-border) !important;
}

body.dark-mode header input[type="text"]::placeholder {
  color: var(--color-text-secondary) !important;
}

body.dark-mode header #theme-toggle {
  background-color: var(--color-button-bg) !important;
  color: var(--color-text-primary) !important;
}

body.dark-mode header #theme-toggle:hover {
  background-color: var(--color-button-hover) !important;
  color: var(--color-text-primary) !important;
}


/* Dark mode - search results popup */
body.dark-mode #search-results {
  background-color: var(--color-bg-search) !important;
  border-color: var(--color-border) !important;
}

body.dark-mode .search-result-item {
  color: var(--color-text-primary) !important;
  border-color: var(--color-border) !important;
}

body.dark-mode .search-result-item:hover {
  background-color: var(--color-bg-hover) !important;
}

body.dark-mode .search-result-name {
  color: var(--color-text-primary) !important;
}

/* Dark Mode - via system preference (fallback) */
@media (prefers-color-scheme: dark) {
  body:not(.light-mode) {
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-light: #ffffff;
    --color-text-muted: #b0b0b0;
    
    --color-bg-body: #1a1a1a;
    --color-bg-header: #252525;
    --color-bg-nav: #2a2a2a;
    --color-bg-hover: #333333;
    --color-bg-card: #2a2a2a;
    --color-bg-subtle: #2a2a2a;
    --color-bg-search: #2a2a2a;
    
    --color-nav-submenu-bg: #333333;
    --color-nav-item-hover: #404040;
    
    --color-badge-bg: #404040;
    --color-badge-text: #b0b0b0;
    
    --color-border: #404040;
    --color-border-light: #333333;
    --color-border-dark: #4a4a4a;
  }
}

/* ============================================
   Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-heading);
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-heading-1);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-heading-2);
}

h3 {
  font-size: var(--font-heading-3);
  margin-top: var(--spacing-2xl);
}

p {
  margin-bottom: var(--spacing-xs);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

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

a:hover {
  color: var(--color-primary-dark);
}

/* Override link color for card links */
a.set-card,
a.set-card:hover {
  color: var(--color-text-primary) !important;
}

ul, ol {
  margin-bottom: var(--spacing-md);
  margin-left: 0;
  padding-left: 0;
  list-style-position: inside;
}

ul li, ol li {
  margin-bottom: var(--spacing-xs);
}

/* ============================================
   Header
   ============================================ */
header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-bg-header);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--spacing-lg);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background-color: transparent;
  border: none;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
  display: block;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(10px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
  scale: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-10px);
}

header img {
  height: 40px;
  width: auto;
  transition: opacity var(--transition-fast);
}

.header-search {
  display: flex;
  gap: var(--spacing-sm);
  flex: 0 1 600px;
  position: relative;
  margin: 0 var(--spacing-lg);
}

header input[type="text"] {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-body);
  font-family: var(--font-family-base);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
  background-color: var(--color-bg-search);
  color: var(--color-text-primary);
}

header input[type="text"]::placeholder {
  color: var(--color-text-secondary);
}

header input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

header input[type="submit"],
header button:not(.mobile-menu-toggle) {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-button-bg);
  color: var(--color-text-light);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-button);
  font-weight: var(--font-weight-emphasis);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

header input[type="submit"]:hover,
header button:not(.mobile-menu-toggle):hover {
  background-color: var(--color-button-hover);
}

.mobile-menu-toggle {
  background-color: transparent !important;
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle.active {
  background-color: transparent !important;
}

.header-controls {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}


#theme-toggle {
  position: relative;
  width: 50px;
  height: 50px;
  padding: 0;
  background-color: var(--color-bg-nav) !important;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border) !important;
  border-radius: var(--radius-round);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-fast);
}

#theme-toggle:hover {
  background-color: var(--color-bg-hover) !important;
  border-color: var(--color-primary) !important;
}

header input[type="submit"]:active, header #theme-toggle:active {
  transform: scale(0.95);
}

/* ============================================
   Navigation - Sidebar
   ============================================ */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

nav {
  position: fixed;
  left: 0;
  top: var(--header-height);
  width: 200px;
  height: calc(100vh - var(--header-height));
  background-color: var(--color-bg-nav);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: 99;
}

nav ul {
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: var(--spacing-md) 0;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-emphasis);
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

nav a:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

nav a.active {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  border-left-color: var(--color-primary-dark);
}

/* Submenu styling */
nav .submenu {
  background-color: var(--color-nav-submenu-bg);
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: 0;
  margin: 0;
}

nav .submenu a {
  padding: var(--spacing-xs) var(--spacing-lg) var(--spacing-xs) calc(var(--spacing-lg) * 1.5);
  border-left: 3px solid transparent;
  font-weight: var(--font-weight-body);
  font-size: clamp(12px, 1.4vw, var(--font-body-small));
  color: var(--color-text-primary);
  white-space: nowrap;
}

nav .submenu a:hover {
  background-color: var(--color-nav-item-hover);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

/* ============================================
   Main Content
   ============================================ */
main {
  margin-left: 200px;
  max-width: calc(var(--max-width-container) + 200px);
  padding: var(--spacing-2xl) var(--spacing-xl);
}

main > a {
  display: inline-block;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: var(--font-body-small);
}

main > h1 {
  margin-bottom: var(--spacing-lg);
}

main > p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
}

/* ============================================
   Sub Navigation (Category Filter)
   ============================================ */
main > nav {
  background-color: transparent;
  border-bottom: 2px solid var(--color-border);
  position: static;
  margin-bottom: var(--spacing-2xl);
  width: 100%;
  height: auto;
  border-right: none;
}

main > nav ul {
  display: flex;
  flex-direction: row;
  padding: 0;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

main > nav a {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-emphasis);
  border-left: none;
  border-bottom: none;
}

main > nav a:hover {
  background-color: var(--color-nav-submenu-bg);
  color: var(--color-text-primary);
  border-left-color: transparent;
}

main > nav a.active {
  background-color: var(--color-primary);
  color: var(--color-text-light);
  border-left-color: transparent;
}

/* ============================================
   Methods Grid
   ============================================ */
.methods-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--spacing-lg);
  width: 100%;
}

.method-column {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ============================================
   Category Titles
   ============================================ */
.category-title {
  font-size: var(--font-heading-3);
  font-weight: var(--font-weight-heading);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.category-title:is(.library) { background-color: var(--color-library); }
.category-title:is(.field) { background-color: var(--color-field); }
.category-title:is(.lab) { background-color: var(--color-lab); }
.category-title:is(.showroom) { background-color: var(--color-showroom); }
.category-title:is(.workshop) { background-color: var(--color-workshop); }
.category-title:is(.extra) { background-color: var(--color-extra); }

.category-title.phase-title {
  background-color: var(--color-primary);
  font-size: clamp(16px, 2.2vw, var(--font-heading-3));
}

/* Strategy icon in method links */
.card-strategy-icon {
  height: 16px;
  width: 16px;
  object-fit: contain;
  margin-right: var(--spacing-xs);
  vertical-align: middle;
}

/* ============================================
   Set Overview Layout
   ============================================ */
.sets-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3xl);
}

.set-section {
  display: flex;
  flex-direction: column;
}

.set-title {
  font-size: var(--font-heading-2);
  font-weight: var(--font-weight-heading);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-border);
  scroll-margin-top: 120px; /* ensure heading stays visible below fixed header/nav */
}

.set-intro {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

.set-cards-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.set-card {
  flex: 0 1 calc(25% - var(--spacing-lg));
  padding: var(--spacing-md);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary) !important;
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-card-title);
  line-height: var(--line-height-heading);
  word-wrap: break-word;
  hyphens: auto;
  min-height: 48px;
}

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

.set-card.library { border-color: var(--color-library-light); }
.set-card.field { border-color: var(--color-field-light); }
.set-card.lab { border-color: var(--color-lab-light); }
.set-card.showroom { border-color: var(--color-showroom-light); }
.set-card.workshop { border-color: var(--color-workshop-light); }
.set-card.extra { border-color: var(--color-extra-light); }

.set-card.library:hover { border-color: var(--color-library); }
.set-card.field:hover { border-color: var(--color-field); }
.set-card.lab:hover { border-color: var(--color-lab); }
.set-card.showroom:hover { border-color: var(--color-showroom); }
.set-card.workshop:hover { border-color: var(--color-workshop); }
.set-card.extra:hover { border-color: var(--color-extra); }

/* Responsive set cards */
@media (max-width: 1200px) {
  .set-card {
    flex: 0 1 calc(33.333% - var(--spacing-lg));
  }
}

@media (max-width: 768px) {
  .set-card {
    flex: 0 1 calc(50% - var(--spacing-lg));
  }
}

@media (max-width: 480px) {
  .set-card {
    flex: 0 1 calc(100% - var(--spacing-lg));
  }
}

.method-column .category-icon, .method-column .category-link {
  margin: 0 auto 10px auto;
  height: 50px;
  width: 50px;
}

/* ============================================
   Method Lists
   ============================================ */
.method-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.method-list li {
  margin: 0;
}

.method-list a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  font-size: var(--font-card-title);
  line-height: var(--line-height-heading);
  word-wrap: break-word;
  hyphens: auto;
}

.set-badge {
  display: inline-block;
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  padding: 4px 12px;
  border-radius: var(--radius-round);
  font-size: 10px;
  text-transform: uppercase;
  font-weight: var(--font-weight-heading);
  white-space: nowrap;
  margin-left: var(--spacing-xs);
  border: 1px solid transparent;
  line-height: 1;
}

.method-list a.library { border-color: var(--color-library-light); }
.method-list a.field { border-color: var(--color-field-light); }
.method-list a.lab { border-color: var(--color-lab-light); }
.method-list a.showroom { border-color: var(--color-showroom-light); }
.method-list a.workshop { border-color: var(--color-workshop-light); }
.method-list a.extra { border-color: var(--color-extra-light); }

.method-list a.library:hover { border-color: var(--color-library); }
.method-list a.field:hover { border-color: var(--color-field); }
.method-list a.lab:hover { border-color: var(--color-lab); }
.method-list a.showroom:hover { border-color: var(--color-showroom); }
.method-list a.workshop:hover { border-color: var(--color-workshop); }
.method-list a.extra:hover { border-color: var(--color-extra); }

.method-list a:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1400px) {
  .methods-grid {
    gap: var(--spacing-md);
  }
  
  .method-list a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
  }
}

@media (max-width: 1200px) {
  nav {
    width: 160px;
  }
  
  main {
    margin-left: 160px;
  }
  
  .methods-grid {
    gap: var(--spacing-sm);
  }
  
  .category-title {
    font-size: var(--font-card-title);
    padding: var(--spacing-sm);
  }
}

@media (max-width: 1024px) {
  nav {
    width: 140px;
  }
  
  main {
    margin-left: 140px;
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  nav a {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-body-small);
  }
}

@media (max-width: 900px) {
  .methods-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  header {
    flex-direction: column;
    height: auto;
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    align-items: stretch;
  }
  
  .header-top {
    display: flex;
    width: 100%;
  }
  
  header img {
    height: 35px;
  }
  
  .header-search {
    width: 100%;
    max-width: none;
    margin: 0;
    flex: 0 0 auto;
    flex-direction: row;
  }
  
  .header-controls {
    width: 100%;
    justify-content: flex-end;
  }

  .header-controls {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: auto;
  }

  .header-search input[type="text"] {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-body-small);
  }

  .header-search input[type="submit"] {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-body-small);
    line-height: 1;
  }
  
  /* Mobile: sidebar wird hamburger menü */
  nav {
    position: fixed;
    top: var(--mobile-header-height, 150px);
    left: 0;
    right: 0;
    width: 100%;
    max-height: 0;
    border-right: none;
    border-bottom: none;
    border-top: none;
    background-color: var(--color-bg-nav);
    overflow: hidden;
    overflow-y: auto;
    transition: max-height var(--transition-base);
    z-index: 98;
  }
  
  nav.mobile-menu-open {
    max-height: calc(100vh - var(--mobile-header-height, 150px));
    border-top: 1px solid var(--color-border);
  }
  
  nav ul {
    flex-direction: column;
    padding: var(--spacing-md) 0;
    white-space: normal;
  }
  
  nav li {
    margin: 0;
  }
  
  nav a {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-body);
    border-left: 3px solid transparent;
    border-bottom: none;
  }
  
  nav a:hover {
    border-left-color: var(--color-primary);
    border-bottom-color: transparent;
  }
  
  nav a.active {
    border-left-color: var(--color-primary-dark);
    border-bottom-color: transparent;
  }
  
  /* Submenu styling for mobile */
  nav .submenu {
    background-color: var(--color-nav-submenu-bg);
    display: flex;
    flex-direction: column;
    list-style: none;
    padding: 0;
    margin: 0;
  }
  
  nav .submenu a {
    padding: var(--spacing-xs) var(--spacing-lg) var(--spacing-xs) calc(var(--spacing-lg) * 2);
    border-left: 3px solid transparent;
    font-weight: var(--font-weight-body);
    font-size: var(--font-body-small);
    color: var(--color-text-primary);
    white-space: normal;
  }
  
  main {
    margin-left: 0;
    margin-top: 0;
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .methods-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--font-heading-2);
  }
  
  h2 {
    font-size: var(--font-heading-3);
  }
  
  main > nav ul {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .methods-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  header,
  nav,
  header button {
    display: none;
  }
  
  main {
    max-width: none;
    padding: 0;
  }
  
  .method-list a {
    border: 1px solid var(--color-border-dark);
    box-shadow: none;
  }
}

/* ============================================
   Method Card Summary Styles (Horizontal Bars)
   ============================================ */

.card-summary-wrapper {
  display: block;
  cursor: pointer;
  text-decoration: none;
  color: var(--color-text-primary) !important;
  transition: all var(--transition-fast);
}

.card-summary-wrapper:hover .card-summary {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-summary {
  display: flex;
  align-items: stretch;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 8px solid var(--color-library);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-xl);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  box-shadow: var(--shadow-sm);
  min-height: 160px;
}

/* Category-specific colors */
.card-summary.library { border-left-color: var(--color-library); }
.card-summary.field { border-left-color: var(--color-field); }
.card-summary.lab { border-left-color: var(--color-lab); }
.card-summary.showroom { border-left-color: var(--color-showroom); }
.card-summary.workshop { border-left-color: var(--color-workshop); }
.card-summary.extra { border-left-color: var(--color-extra); }

.card-summary.library:hover { border-color: var(--color-library-light); }
.card-summary.field:hover { border-color: var(--color-field-light); }
.card-summary.lab:hover { border-color: var(--color-lab-light); }
.card-summary.showroom:hover { border-color: var(--color-showroom-light); }
.card-summary.workshop:hover { border-color: var(--color-workshop-light); }
.card-summary.extra:hover { border-color: var(--color-extra-light); }

/* Afbeelding styling */
.card-image, .pattern-image {
  float: right;
  margin: 0 0 var(--spacing-md) var(--spacing-md);
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.card-image {
  max-height: 500px;
}

.pattern-image {
  max-height: 300px;
}

/* Content page images */
.content-image-right {
  float: right;
  margin: 0 0 var(--spacing-md) var(--spacing-md);
  max-width: 400px;
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.card-image-summary {
  max-height: 160px;
  height: auto;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

/* Content wrapper for title and why section */
.card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.card-content h2 {
  font-size: var(--font-card-title);
  margin: 0;
  color: var(--color-text-primary);
}

/* Why/Description sectie */
.card-why {
  flex: 1;
  font-size: var(--font-body-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

.card-why strong {
  display: block;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

/* Badges (Generic reusable badges) */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.badge {
  display: inline-block;
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  padding: 4px 12px;
  border-radius: var(--radius-round);
  font-size: 10px;
  text-transform: uppercase;
  font-weight: var(--font-weight-heading);
  white-space: nowrap;
  margin-left: var(--spacing-xs);
  text-decoration: none !important;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.badge:hover {
  background-color: var(--color-primary-light);
  color: var(--color-text-light) !important;
}

/* "More info" text aan de rechterkant */
.card-more-info {
  font-weight: var(--font-weight-heading);
  font-size: var(--font-body-small);
  white-space: nowrap;
  padding-left: var(--spacing-md);
  display: flex;
  align-items: center;
  color: var(--color-primary);
}

/* Responsive aanpassingen */
@media (max-width: 768px) {
  .card-summary {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .card-info {
    flex: none;
  }

  .card-image, .pattern-image {
    width: 100%;
    height: 150px;
    float: right;
  }

  .content-image-right {
    max-width: 250px;
    margin: 0 0 var(--spacing-sm) var(--spacing-sm);
  }
}

/* ============================================
   Search Results
   ============================================ */
#search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 8px;
  background-color: var(--color-bg-search);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-height: 500px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
}

.search-results-list {
  display: flex;
  flex-direction: column;
}

.search-section-header {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-bg-subtle);
  color: var(--color-text-secondary);
  font-size: var(--font-body-small);
  font-weight: var(--font-weight-strong);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border-light);
}

.search-result-item {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: background-color var(--transition-fast);
  display: block;
}

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

.search-result-item:hover {
  background-color: var(--color-bg-subtle);
}

.search-result-row {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.search-result-icon-wrap {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-result-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.search-result-name {
  font-weight: var(--font-weight-heading);
  font-size: var(--font-body);
  margin-bottom: var(--spacing-xs);
}

.search-result-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.search-result-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.search-badge {
  display: inline-block;
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  padding: 4px 10px;
  border-radius: var(--radius-round);
  font-size: 10px;
  text-transform: uppercase;
  font-weight: var(--font-weight-heading);
  white-space: nowrap;
  line-height: 1;
}

.search-result-preview {
  font-size: var(--font-body-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

.search-no-results {
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-body-small);
}

/* ============================================
   Scatter Plot View
   ============================================ */
.scatter-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
}

.scatter-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.scatter-legend-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 6px 10px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
}

.scatter-legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  display: inline-block;
}

.scatter-legend-swatch.scatter-library { background-color: var(--color-library); }
.scatter-legend-swatch.scatter-field { background-color: var(--color-field); }
.scatter-legend-swatch.scatter-lab { background-color: var(--color-lab); }
.scatter-legend-swatch.scatter-showroom { background-color: var(--color-showroom); }
.scatter-legend-swatch.scatter-workshop { background-color: var(--color-workshop); }
.scatter-legend-swatch.scatter-extra { background-color: var(--color-extra); }

.scatter-controls button {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-emphasis);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.scatter-controls button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.scatter-plot {
  width: 100%;
  height: 70vh;
  min-height: 520px;
  max-height: 720px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-card);
  box-shadow: var(--shadow-md);
}

.scatter-footnote {
  margin-top: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-body-small);
}

/* ============================================
   Trade-offs Display - Visual Bars
   ============================================ */
.tradeoffs-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin: var(--spacing-md) 0;
}

.tradeoff-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.tradeoff-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-body-small);
  font-weight: var(--font-weight-emphasis);
  color: var(--color-text-primary);
}

.tradeoff-label-left {
  text-align: left;
}

.tradeoff-label-right {
  text-align: right;
}

.tradeoff-bar-container {
  width: 100%;
}

.tradeoff-bar-background {
  width: 100%;
  height: 24px;
  background-color: var(--color-badge-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.tradeoff-bar-fill {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  transition: width 150ms ease-in-out;
}

/* ============================================
   Research Pattern Navigator Cards
   ============================================ */
.pattern-cards-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  width: 100%;
  margin-top: var(--spacing-2xl);
}

.pattern-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: var(--spacing-xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  min-height: 320px;
  gap: var(--spacing-lg);
}

.pattern-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.pattern-card-icon {
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.pattern-card-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pattern-card-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  text-align: center;
  flex: 1;
}

.pattern-card-question {
  font-size: var(--font-card-title);
  font-weight: var(--font-weight-strong);
  color: var(--color-text-primary);
  line-height: var(--line-height-heading);
  margin: 0;
}

.pattern-card-name {
  font-size: var(--font-body);
  font-weight: var(--font-weight-emphasis);
  color: var(--color-primary);
  margin: 0;
  transition: color var(--transition-fast);
}

.pattern-card:hover .pattern-card-name {
  color: var(--color-primary-dark);
}

/* Responsive pattern cards */
@media (max-width: 1024px) {
  .pattern-cards-container {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .pattern-card {
    padding: var(--spacing-lg);
    min-height: 300px;
  }
  
  .pattern-card-icon {
    width: 130px;
    height: 130px;
  }
}

@media (max-width: 768px) {
  .pattern-cards-container {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
  
  .pattern-card {
    padding: var(--spacing-lg);
    min-height: 280px;
  }
  
  .pattern-card-question {
    font-size: var(--font-body);
  }
  
  .pattern-card-icon {
    width: 110px;
    height: 110px;
  }
}

@media (max-width: 480px) {
  .pattern-cards-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
  }
  
  .pattern-card {
    padding: var(--spacing-md);
    min-height: auto;
    gap: var(--spacing-md);
  }
  
  .pattern-card-question {
    font-size: var(--font-body-small);
  }
  
  .pattern-card-icon {
    width: 80px;
    height: 80px;
  }

  .content-image-right {
    float: none;
    max-width: 100%;
    margin: 0 auto var(--spacing-md) auto;
    display: block;
  }
}

body.dark-mode .pattern-card {
  background-color: var(--color-bg-card);
  border-color: var(--color-border);
}

body.dark-mode .pattern-card:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-primary-light);
}

/* Pattern Search Results Styling */
.pattern-search-results {
  width: 100%;
  margin-top: var(--spacing-xl);
}

.pattern-search-result {
  margin-bottom: var(--spacing-lg);
  display: block;
}

.pattern-search-link {
  display: flex;
  align-items: stretch;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 8px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  gap: var(--spacing-xl);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  box-shadow: var(--shadow-sm);
  min-height: 160px;
  cursor: pointer;
  text-decoration: none;
  color: var(--color-text-primary) !important;
}

.pattern-search-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.pattern-search-image {
  flex-shrink: 0;
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.pattern-search-image img {
  max-height: 160px;
  height: auto;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.pattern-search-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.pattern-search-content h3 {
  font-size: var(--font-card-title);
  margin: 0;
  color: var(--color-text-primary);
}

.pattern-search-why {
  flex: 1;
  font-size: var(--font-body-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

.pattern-search-why strong {
  display: block;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

/* Responsive pattern search results */
@media (max-width: 768px) {
  .pattern-search-link {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    min-height: auto;
  }

  .pattern-search-image {
    width: 100%;
    height: 200px;
  }

  .pattern-search-image img {
    max-height: 200px;
    max-width: 100%;
  }
}

body.dark-mode .pattern-search-link {
  background-color: var(--color-bg-card);
  border-color: var(--color-border);
}

body.dark-mode .pattern-search-link:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-primary-light);
}

/* ============================================
   Contact Form
   ============================================ */
.contact-form {
  max-width: 600px;
  margin: 2rem 0;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.btn-primary {
  background-color: #007bff;
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background-color: #0056b3;
}

.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
}

.alert-success {
  background-color: #d4edda;
  border: 1px solid #c3e6cb;
  color: #155724;
}

.alert-error {
  background-color: #f8d7da;
  border: 1px solid #f5c6cb;
  color: #721c24;
}

/* Dark mode - Contact Form */
body.dark-mode .form-group input,
body.dark-mode .form-group textarea {
  background-color: var(--color-bg-card);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

body.dark-mode .form-group input:focus,
body.dark-mode .form-group textarea:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(85, 105, 255, 0.2);
}

body.dark-mode .alert-success {
  background-color: #1a3a2a;
  border-color: #2d5a3d;
  color: #8fd9a8;
}

body.dark-mode .alert-error {
  background-color: #3a1a1a;
  border-color: #5a2d2d;
  color: #f9a8a8;
}

/* ============================================
   Dual Column Layout (DOT Framework pages)
   ============================================ */
.dual-column-container {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.dual-column-item {
  flex: 1;
  min-width: 300px;
}

.dual-column-item h2 {
  margin-top: 0;
}

.dual-column-item img {
  width: 100%;
  max-width: 450px;
  height: auto;
  display: block;
  margin: 1.5rem auto 0;
}

/* Responsive: stack on smaller screens */
@media (max-width: 768px) {
  .dual-column-item {
    min-width: 100%;
  }
  
  .dual-column-item img {
    max-width: 250px;
  }
}