/* ===================================================================
   Norwegian Letters Browser - Styles
   =================================================================== */

/* CSS Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* CSS Custom Properties (Theme Variables) */
:root {
  /* Colors - Light Theme (inspired by original site) */
  --color-primary: #3d4b79;
  --color-primary-hover: #6f728c;
  --color-heading: #4f5979;
  --color-text: #444;
  --color-text-muted: #666;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-accent: #f0f2f7;
  --color-border: #ddd;
  --color-border-light: #eee;

  /* UI Colors */
  --color-link: #3d4b79;
  --color-link-hover: #6f728c;
  --color-success: #4caf50;
  --color-warning: #ff9800;
  --color-error: #f44336;

  /* Typography */
  --font-serif: Georgia, 'Times New Roman', Times, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Layout */
  --sidebar-width: 280px;
  --max-content-width: 900px;
  --border-radius: 6px;

  /* Transitions */
  --transition-speed: 0.2s;
}

/* Dark Theme - Light blue and black */
[data-theme="dark"] {
  --color-primary: #5b9bd5;
  --color-primary-hover: #7bb3e0;
  --color-heading: #7bb3e0;
  --color-text: #e8e8e8;
  --color-text-muted: #aaaaaa;
  --color-bg: #0d0d0d;
  --color-bg-secondary: #1a1a1a;
  --color-bg-accent: #252525;
  --color-border: #404040;
  --color-border-light: #2d2d2d;

  --color-link: #5b9bd5;
  --color-link-hover: #7bb3e0;
}

/* Base Styles */
html {
  font-size: 62.5%; /* 1rem = 10px - default */
  height: 100%;
}

/* Font size variants - affects entire page */
html.font-small { font-size: 56.25%; /* 0.9x */ }
html.font-medium { font-size: 62.5%; /* 1x - default */ }
html.font-large { font-size: 68.75%; /* 1.1x */ }
html.font-xlarge { font-size: 81.25%; /* 1.3x */ }
html.font-xxlarge { font-size: 93.75%; /* 1.5x */ }
html.font-xxxlarge { font-size: 106.25%; /* 1.7x */ }

body {
  font-family: var(--font-serif);
  font-size: 1.8rem;  /* Increased from 1.6rem */
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-heading);
}

h1 { font-size: 2.8rem; font-weight: normal; }
h2 { font-size: 2.4rem; font-weight: normal; }
h3 { font-size: 2rem; font-weight: normal; font-style: italic; }
h4 { font-size: 1.8rem; font-weight: bold; }

p {
  margin-bottom: var(--spacing-md);
}

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

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

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===================================================================
   Site Header
   =================================================================== */

.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.site-title {
  font-size: 2.8rem;
  margin: 0;
  font-weight: normal;
  color: var(--color-primary);
}

.site-title a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.site-title a:hover {
  opacity: 0.7;
  cursor: pointer;
}

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

/* Language Toggle */
.language-toggle {
  display: flex;
  gap: var(--spacing-xs);
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-xs);
}

.language-toggle button {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  color: var(--color-text);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  cursor: pointer;
  border-radius: calc(var(--border-radius) - 2px);
  transition: all var(--transition-speed);
}

.language-toggle button:hover {
  background-color: var(--color-bg-accent);
}

.language-toggle button.active {
  background-color: var(--color-primary);
  color: white;
}

/* Better contrast in dark mode */
[data-theme="dark"] .language-toggle {
  background-color: var(--color-bg-secondary);
}

[data-theme="dark"] .language-toggle button {
  color: var(--color-text);
}

[data-theme="dark"] .language-toggle button.active {
  background-color: var(--color-primary);
  color: white;
}

/* Dark Mode Toggle */
.icon-button {
  background: var(--color-bg-secondary);
  border: none;
  border-radius: var(--border-radius);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 2rem;
  transition: all var(--transition-speed);
}

.icon-button:hover {
  background-color: var(--color-bg-accent);
}

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

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

/* ===================================================================
   Main Container Layout
   =================================================================== */

.main-container {
  display: flex;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  position: relative;
}

/* ===================================================================
   Sidebar
   =================================================================== */

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  position: sticky;
  top: 73px; /* Height of header */
  height: calc(100vh - 73px);
}

.sidebar-toggle-container {
  display: none; /* Hidden on desktop */
}

.sidebar-toggle {
  padding: var(--spacing-md);
  background: var(--color-primary);
  color: white;
  border: none;
  font-size: 1.4rem;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  width: 100%;
}

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

.mobile-nav-buttons {
  display: none; /* Hidden on desktop */
}

.sidebar-content {
  padding: var(--spacing-lg);
  flex: 1;
  overflow-y: auto;
}

/* Search Section */
.search-section {
  margin-bottom: var(--spacing-lg);
}

.search-input-wrapper {
  position: relative;
  margin-bottom: var(--spacing-sm);
}

.search-section input[type="search"] {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-right: 3.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
}

.search-section input[type="search"]:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.search-clear-btn {
  position: absolute;
  right: var(--spacing-xs);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 2.4rem;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--spacing-xs);
  line-height: 1;
  transition: color 0.2s ease;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-clear-btn:hover {
  color: var(--color-text);
}

.search-clear-btn[hidden] {
  display: none;
}

/* Prefix hint */
.prefix-hint {
  font-size: 1.35rem;
  color: var(--color-primary);
  font-family: var(--font-sans);
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
  font-style: normal;
}

.prefix-hint[hidden] {
  display: none;
}

.prefix-hint kbd {
  background-color: var(--color-bg-accent);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 2px 6px;
  font-size: 1.2rem;
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 600;
}

/* Active Filters */
.active-filters {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-bg-accent);
  border-radius: var(--border-radius);
}

.active-filters-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 1.4rem;
}

.active-filters-header .label {
  font-weight: bold;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
}

/* Filter Sections */
.filter-section {
  margin-bottom: var(--spacing-lg);
}

.filter-heading {
  font-size: 1.6rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-weight: 600;
}

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

.filter-button {
  padding: var(--spacing-md);
  background-color: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.filter-button:hover {
  background-color: var(--color-bg-accent);
  border-color: var(--color-primary);
}

.filter-button.active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.filter-chips.scrollable {
  max-height: 200px;
  overflow-y: auto;
}

.filter-chip {
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 1.3rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-speed);
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

.filter-chip:hover {
  background-color: var(--color-bg-accent);
  border-color: var(--color-primary);
}

.filter-chip.active {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* AND filter active state (tags, creators, locations, destinations) */
.filter-chip.active-and {
  background-color: #4a7ba7;  /* Slightly different blue for AND filters */
  color: white;
  border-color: #4a7ba7;
}

.filter-chip.active-filter {
  background-color: var(--color-primary);
  color: white;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* AND filter in active filters list */
.filter-chip.active-filter.and-filter {
  background-color: #4a7ba7;
  border-color: #4a7ba7;
}

/* Negative filter styling - dull light red */
.filter-chip.negative-filter {
  background-color: #c9878b;  /* Dull light red */
  color: white;
  border-color: #c9878b;
}

.filter-chip.active-filter .remove {
  cursor: pointer;
  font-weight: bold;
}

/* Results Summary */
.results-summary {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  text-align: center;
  color: var(--color-text-muted);
}

/* Sidebar separator */
.sidebar-separator {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-sm) 0;
}

/* Map link section */
.map-link-section {
  text-align: center;
  margin: var(--spacing-sm) 0;
}

/* More padding for map link sections on desktop */
@media (min-width: 769px) {
  .map-link-section {
    margin: var(--spacing-lg) 0;
  }
}

.map-link {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: white;
  text-decoration: none;
  border: 1px solid var(--color-primary);
  border-radius: var(--border-radius);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  font-weight: normal;
  transition: all var(--transition-speed);
}

.map-link:hover {
  background-color: var(--color-link-hover);
  border-color: var(--color-link-hover);
  color: white;
}

/* Download section */
.download-section {
  text-align: center;
  margin: var(--spacing-sm) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.download-btn {
  display: inline-block;
  width: auto;
  cursor: pointer;
  text-align: center;
  font-size: 1.3rem;
  padding: var(--spacing-sm) var(--spacing-md);
}

/* ===================================================================
   Main Content
   =================================================================== */

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  max-width: var(--max-content-width);
  margin: 0 auto;
  width: 100%;
}

/* Loading Screen */
.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  gap: var(--spacing-lg);
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Views */
.view {
  display: none;
}

.view.active {
  display: block;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===================================================================
   List View
   =================================================================== */

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.list-header h2 {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.count-badge {
  font-size: 1.6rem;
  color: var(--color-text-muted);
  font-weight: normal;
}

/* Active Search Summary */
.search-summary {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-sm) 0;
  font-size: 1.5rem;
  font-style: italic;
  color: #4a7ba7;
}

:root[data-theme="dark"] .search-summary {
  color: #60a5fa;
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.4rem;
  font-family: var(--font-sans);
}

.sort-controls label {
  color: var(--color-text-muted);
}

.sort-controls select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  cursor: pointer;
}

.font-size-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: var(--spacing-lg);
}

.font-size-controls label {
  font-size: 1.4rem;
  color: var(--color-text-muted);
}

.font-size-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.6rem;
  font-family: var(--font-sans);
  font-weight: normal;
  cursor: pointer;
  transition: all var(--transition-speed);
  min-width: 40px;
}

.font-size-btn:hover {
  background-color: var(--color-bg-accent);
  border-color: var(--color-primary);
}

/* Better visibility in dark mode */
[data-theme="dark"] .font-size-btn {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-border);
  color: var(--color-text);
}

[data-theme="dark"] .font-size-btn:hover {
  background-color: var(--color-bg-accent);
  border-color: var(--color-primary);
}

[data-theme="dark"] .map-link {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-bg);
}

[data-theme="dark"] .map-link:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-bg);
}

/* Dark mode: TF-IDF terms */
[data-theme="dark"] .letter-article .tfidf-norwegian {
  background-color: #1a237e;
  color: #90caf9;
  border-color: #1565c0;
}

[data-theme="dark"] .letter-article .tfidf-norwegian:hover {
  background-color: #1565c0;
  color: #e3f2fd;
  border-color: #42a5f5;
}

[data-theme="dark"] .letter-article .tfidf-english {
  background-color: #1a237e;
  color: #9fa8da;
  border-color: #3949ab;
}

[data-theme="dark"] .letter-article .tfidf-english:hover {
  background-color: #3949ab;
  color: #e8eaf6;
  border-color: #5c6bc0;
}

/* Filter Options Display */
.filter-options {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.filter-options-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.filter-options-header h3 {
  margin: 0;
  font-size: 1.8rem;
}

.filter-hint {
  font-size: 1.3rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  margin-bottom: var(--spacing-md);
  font-style: italic;
}

.filter-hint kbd {
  padding: 2px var(--spacing-sm);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-style: normal;
}

.filter-hint-small {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  margin-top: var(--spacing-xs);
  font-style: italic;
}

.filter-hint-small kbd {
  padding: 1px var(--spacing-xs);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 1.0rem;
  font-style: normal;
}

.filter-chips-large {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  max-height: 400px;
  overflow-y: auto;
}

.filter-chips-large .filter-chip {
  font-size: 1.5rem;
  padding: var(--spacing-sm) var(--spacing-lg);
}

/* Year Chart */
.year-chart {
  width: 100%;
  margin: var(--spacing-md) 0;
}

.year-chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 250px;
  padding: var(--spacing-md);
  padding-bottom: 60px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  position: relative;
}

.year-bar-container {
  flex: 1;
  min-width: 25px;
  height: 190px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
}

.year-bar {
  width: 100%;
  background-color: var(--color-primary);
  cursor: pointer;
  transition: background-color 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 4px;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  border-radius: 3px 3px 0 0;
  box-shadow:
    0 2px 6px rgba(0, 0, 0, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.1),
    inset -2px 0 2px rgba(0, 0, 0, 0.15),
    inset 2px 0 2px rgba(255, 255, 255, 0.3),
    inset 0 2px 3px rgba(255, 255, 255, 0.2);
}

.year-bar:hover {
  background-color: var(--color-primary-hover);
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow:
    0 4px 8px rgba(0, 0, 0, 0.25),
    0 2px 4px rgba(0, 0, 0, 0.15),
    inset -2px 0 2px rgba(0, 0, 0, 0.15),
    inset 2px 0 2px rgba(255, 255, 255, 0.4),
    inset 0 2px 3px rgba(255, 255, 255, 0.25);
}

.year-bar.active {
  background-color: #5b9bd5;
  opacity: 1;
  box-shadow:
    0 3px 7px rgba(0, 0, 0, 0.22),
    0 1px 3px rgba(0, 0, 0, 0.12),
    inset -2px 0 2px rgba(0, 0, 0, 0.15),
    inset 2px 0 2px rgba(255, 255, 255, 0.35),
    inset 0 2px 3px rgba(255, 255, 255, 0.22);
}

.year-bar-count {
  font-size: 1.0rem;
  font-weight: bold;
  color: white;
  text-shadow: 0 0 2px rgba(0,0,0,0.5);
  line-height: 1;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  pointer-events: none;
}

.year-bar-label {
  font-size: 1.0rem;
  position: absolute;
  bottom: -50px;
  left: 50%;
  transform: translateX(-50%) rotate(-45deg);
  transform-origin: center;
  white-space: nowrap;
  color: var(--color-text);
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  pointer-events: none;
}

@media (max-width: 768px) {
  .year-chart-bars {
    height: 200px;
    padding-bottom: 50px;
  }

  .year-bar-container {
    height: 140px;
  }

  .year-bar-label {
    font-size: 0.9rem;
    bottom: -45px;
  }

  .year-bar-count {
    font-size: 0.9rem;
  }
}

/* Letters List */
.letters-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.letter-list-item {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.letter-list-item:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.letter-list-item .letter-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-sm);
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.letter-list-item h3 {
  margin: 0;
  font-size: 2.2rem;
  color: var(--color-primary);
}

.letter-list-item time {
  font-size: 1.4rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.letter-list-item .letter-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.letter-list-item .letter-meta .creator {
  font-weight: 500;
}

.letter-list-item .letter-meta .route-info {
  font-style: italic;
  color: var(--color-primary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.letter-list-item .letter-meta .route-info .arrow {
  padding: 0 var(--spacing-xs);
  font-style: normal;
}

.letter-list-item .letter-meta .clickable-creator,
.letter-list-item .letter-meta .clickable-location,
.letter-list-item .letter-meta .clickable-destination {
  cursor: pointer;
  transition: all var(--transition-speed);
  padding: 2px 4px;
  margin: 0 1px;
  border-radius: 3px;
  display: inline-block;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

.letter-list-item .letter-meta .clickable-creator:hover,
.letter-list-item .letter-meta .clickable-location:hover,
.letter-list-item .letter-meta .clickable-destination:hover {
  text-decoration: underline;
  color: var(--color-primary-hover);
  background-color: var(--color-bg-accent);
}

.letter-list-item .letter-meta .creator-separator {
  pointer-events: none;
  user-select: none;
}

.letter-list-item .letter-header .clickable-year {
  cursor: pointer;
  transition: all var(--transition-speed);
  padding: 2px 4px;
  border-radius: 3px;
  display: inline-block;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

.letter-list-item .letter-header .clickable-year:hover {
  text-decoration: underline;
  color: var(--color-primary-hover);
  background-color: var(--color-bg-accent);
}

.letter-list-item .letter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.letter-list-item .tag {
  padding: 2px var(--spacing-sm);
  background-color: var(--color-bg-accent);
  border-radius: 4px;
  font-size: 1.2rem;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
}

.letter-list-item .more {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  font-style: italic;
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--color-text-muted);
}

/* List Bottom Navigation */
.list-bottom-nav {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.bottom-nav-btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-sans);
  transition: all var(--transition-speed);
}

.bottom-nav-btn.home-btn {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.bottom-nav-btn.home-btn:hover {
  background-color: var(--color-background-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.bottom-nav-btn.reset-btn {
  background-color: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
}

.bottom-nav-btn.reset-btn:hover {
  background-color: var(--color-link-hover);
  border-color: var(--color-link-hover);
}

/* ===================================================================
   Letter View (Single Letter)
   =================================================================== */

.letter-view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.back-button:hover {
  background-color: var(--color-bg-accent);
  border-color: var(--color-primary);
}

.letter-article {
  margin-bottom: var(--spacing-2xl);
}

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

.letter-article .letter-header .letter-title-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--spacing-md);
}

.letter-article .letter-header h2 {
  margin-bottom: var(--spacing-sm);
  flex: 1;
  font-size: 3.2rem;
}

.letter-article .letter-header .letter-id {
  font-size: 1.3rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.letter-article .letter-header time {
  font-size: 1.6rem;
  color: var(--color-text-muted);
  font-family: var(--font-sans);
}

.letter-article .letter-header time .clickable {
  color: var(--color-link);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
}

.letter-article .letter-header time .clickable:hover {
  text-decoration: underline;
  color: var(--color-link-hover);
}

.letter-article .letter-metadata {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xl);
  font-size: 1.5rem;
}

.letter-article .letter-metadata p {
  margin-bottom: var(--spacing-sm);
}

.letter-article .letter-metadata p:last-child {
  margin-bottom: 0;
}

.letter-article .letter-metadata .clickable {
  color: var(--color-link);
  cursor: pointer;
  text-decoration: underline;
  text-decoration-style: dotted;
}

.letter-article .letter-metadata .clickable:hover {
  color: var(--color-link-hover);
}

.letter-article section {
  margin-bottom: var(--spacing-lg);
  margin-top: 0;
}

.letter-article section:first-of-type {
  margin-top: var(--spacing-md);
}

.letter-article section h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  margin-top: 0;
  color: var(--color-heading);
}

.letter-article section > *:first-child {
  margin-top: 0;
}

.letter-article .letter-text,
.letter-article .letter-description {
  line-height: 1.7;
  white-space: pre-wrap;
}

/* Style for all-caps text (common in descriptions) */
.letter-article .letter-description div {
  font-size: 0.7em;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

.letter-article .letter-text div {
  line-height: 1.7;
  margin: 0;
  padding: 0;
}

/* Search term highlighting */
.search-highlight {
  background-color: #b3d9ff;  /* Light blue */
  padding: 0.1em 0.2em;
  border-radius: 2px;
  font-weight: inherit;
}

/* Dark mode search highlighting */
:root[data-theme="dark"] .search-highlight {
  background-color: #2563eb;  /* Darker blue for dark mode */
  color: white;
}

.letter-article .letter-pdf {
  margin: var(--spacing-xl) 0;
  text-align: center;
}

.pdf-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--border-radius);
  font-size: 1.6rem;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: all var(--transition-speed);
}

.pdf-link:hover {
  background-color: var(--color-primary-hover);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.letter-article .letter-tags {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.letter-article .letter-tags h4 {
  font-size: 1.6rem;
  margin-bottom: var(--spacing-md);
  font-family: var(--font-sans);
  color: var(--color-text-muted);
}

.letter-article .tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  margin: 0 var(--spacing-xs) var(--spacing-xs) 0;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 1.4rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.letter-article .tag:hover {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* TF-IDF Terms */
.letter-article .letter-tfidf {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-lg);
}

.letter-article .letter-tfidf h4 {
  font-size: 1.6rem;
  margin-bottom: var(--spacing-md);
  font-family: var(--font-sans);
  color: var(--color-text-muted);
}

.letter-article .tfidf-term {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  margin: 0 var(--spacing-xs) var(--spacing-xs) 0;
  border-radius: 20px;
  font-size: 1.4rem;
  font-family: var(--font-sans);
  transition: all var(--transition-speed);
  border: 1px solid;
  cursor: pointer;
}

.letter-article .tfidf-norwegian {
  background-color: #e3f2fd;
  color: #1565c0;
  border-color: #90caf9;
}

.letter-article .tfidf-norwegian:hover {
  background-color: #1565c0;
  color: white;
  border-color: #1565c0;
}

.letter-article .tfidf-english {
  background-color: #e8eaf6;
  color: #3949ab;
  border-color: #9fa8da;
}

.letter-article .tfidf-english:hover {
  background-color: #3949ab;
  color: white;
  border-color: #3949ab;
}

/* Letter Navigation */
.letter-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-2xl) 0;
  padding: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius);
}

.nav-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.nav-button:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: translateX(0);
}

.nav-button:disabled {
  background-color: var(--color-border);
  cursor: not-allowed;
  opacity: 0.5;
}

.nav-button.nav-prev:hover:not(:disabled) {
  transform: translateX(-4px);
}

.nav-button.nav-next:hover:not(:disabled) {
  transform: translateX(4px);
}

.letter-position {
  font-size: 1.6rem;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
}

/* Keyboard Hint */
.keyboard-hint {
  text-align: center;
  font-size: 1.3rem;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  margin-top: var(--spacing-md);
}

.keyboard-hint kbd {
  padding: 2px var(--spacing-sm);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 1.2rem;
}

/* ===================================================================
   Modal
   =================================================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  z-index: 1001;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
  margin: 0;
}

.close-button {
  background: none;
  border: none;
  font-size: 3rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-button:hover {
  color: var(--color-text);
}

/* Modal Form */
#advanced-search-form {
  padding: var(--spacing-lg);
}

.form-row {
  margin-bottom: var(--spacing-lg);
}

.form-row label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
}

.form-row input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
}

.form-row input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Inline form row (label and input on same line) */
.form-row-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.form-row-inline label {
  font-size: 1.4rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  min-width: 8rem;
}

.form-row-inline input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
}

.form-row-inline input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Two-column form row */
.form-row-double {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.form-col {
  display: flex;
  flex-direction: column;
}

.form-col label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
}

.form-col input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
}

.form-col input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Responsive: stack on mobile */
@media (max-width: 600px) {
  .form-row-double {
    grid-template-columns: 1fr;
  }
}

.modal-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

/* ===================================================================
   Buttons
   =================================================================== */

.btn-primary,
.btn-secondary,
.btn-link {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-bg-accent);
}

.btn-link {
  background: none;
  color: var(--color-link);
  padding: 0;
  text-decoration: underline;
}

.btn-link:hover {
  color: var(--color-link-hover);
}

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

@media (max-width: 768px) {
  .site-title {
    font-size: 2.2rem;
  }

  .main-container {
    flex-direction: column;
  }

  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    min-height: auto;
    top: 0;
    border-right: none;
    border-bottom: none;
    z-index: 500;
    overflow: visible;
  }

  .sidebar-toggle-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: sticky;
    top: 0;
    z-index: 501;
    background: var(--color-primary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
  }

  .sidebar-toggle {
    display: block;
    flex: 1;
    padding: 0;
    background: transparent;
    border: none;
  }

  .mobile-nav-buttons {
    display: flex;
    gap: var(--spacing-sm);
  }

  .mobile-nav-btn {
    padding: 8px 12px;
    background-color: rgba(255, 255, 255, 0.2);
    color: white !important;
    text-decoration: none;
    border-radius: 4px;
    font-size: 1.3rem;
    font-family: var(--font-sans);
    font-weight: 600;
    transition: background-color 0.2s;
    white-space: nowrap;
  }

  .mobile-nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.35);
    color: white !important;
  }

  .mobile-nav-btn:visited {
    color: white !important;
  }

  /* Hide "Back to Letters" link on mobile since it's in the blue nav bar */
  .sidebar-content .map-link-section:first-of-type {
    display: none;
  }

  .sidebar-content {
    display: none;
  }

  .sidebar.open .sidebar-content {
    display: block !important;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 500;
    background-color: var(--color-bg-secondary);
    overflow-y: auto;
    padding-top: 60px;
  }

  /* Close button for mobile sidebar */
  .sidebar.open .sidebar-toggle-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 501;
  }

  /* Mobile inline filter options */
  .mobile-filter-options {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
  }

  /* Hide desktop filter options on mobile */
  .filter-options {
    display: none !important;
  }

  .main-content {
    padding: var(--spacing-md);
  }

  .list-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .letter-navigation {
    flex-direction: column;
  }

  .nav-button {
    width: 100%;
    justify-content: center;
  }

  .letter-position {
    order: -1;
  }

  /* Modal adjustments for mobile */
  .modal-content {
    width: 95%;
    max-height: 90vh;
    margin: var(--spacing-sm);
  }

  .modal-header {
    padding: var(--spacing-md);
  }

  .search-help-body,
  .modal-buttons {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .site-title {
    font-size: 1.9rem;
  }

  .header-controls {
    width: 100%;
    justify-content: space-between;
  }

  .language-toggle button {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 1.2rem;
  }

  .main-content {
    padding: var(--spacing-sm);
  }

  h1 { font-size: 2.2rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.8rem; }

  /* Additional modal adjustments for very small screens */
  .modal-content {
    width: 98%;
    max-height: 92vh;
  }

  .modal-header h2 {
    font-size: 1.8rem;
  }

  .search-help-body {
    font-size: 1.3rem;
  }
}

/* ===================================================================
   Search Help
   =================================================================== */

.search-help-section {
  padding: var(--spacing-sm) 0;
  text-align: center;
}

.search-help-btn {
  background: transparent;
  color: var(--color-text-muted);
  border: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 1.1rem;
  font-family: var(--font-sans);
  cursor: pointer;
  text-decoration: underline;
  transition: color var(--transition-speed);
}

.search-help-btn:hover {
  color: var(--color-primary);
}

.search-help-content {
  max-width: 650px;
  max-height: 85vh;
  overflow-y: auto;
  font-size: 1.4rem;
}

.search-help-body {
  padding: var(--spacing-sm) var(--spacing-md);
}

.help-section {
  margin-bottom: var(--spacing-md);
}

.help-section h3 {
  font-size: 1.6rem;
  font-family: var(--font-sans);
  color: var(--color-heading);
  margin-bottom: var(--spacing-xs);
}

.help-section p {
  margin-bottom: var(--spacing-xs);
  line-height: 1.5;
}

.help-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-xs) 0;
}

.help-list li {
  padding: 4px 0;
  line-height: 1.5;
}

.help-example {
  background-color: var(--color-bg-accent);
  border-left: 3px solid var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  margin: var(--spacing-xs) 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.help-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: var(--spacing-xs);
}

.search-help-body code {
  background-color: var(--color-bg-accent);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-primary);
}

.search-help-body kbd {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 2px 5px;
  font-family: var(--font-sans);
  font-size: 0.8em;
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}