/*
 * Epstein Files - Design System
 * Shared styles for all deliverable pages
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  /* Colors - Dark forensic theme */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #111113;
  --color-bg-tertiary: #18181b;
  --color-bg-elevated: #1c1c1f;
  --color-bg-hover: #232326;
  
  --color-border-subtle: #1f1f23;
  --color-border-default: #27272a;
  --color-border-emphasis: #3f3f46;
  
  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-text-faint: #52525b;
  
  /* Accent colors */
  --color-accent-blue: #3b82f6;
  --color-accent-blue-muted: #1d4ed8;
  --color-accent-cyan: #06b6d4;
  --color-accent-amber: #f59e0b;
  --color-accent-red: #ef4444;
  --color-accent-green: #22c55e;
  --color-accent-purple: #a855f7;
  
  /* Document type colors */
  --color-doc-fbi302: #f59e0b;
  --color-doc-flight: #3b82f6;
  --color-doc-financial: #22c55e;
  --color-doc-deposition: #a855f7;
  --color-doc-correspondence: #06b6d4;
  --color-doc-photo: #ec4899;
  --color-doc-legal: #6366f1;
  --color-doc-other: #71717a;
  
  /* Cluster colors (10 distinct) */
  --color-cluster-0: #3b82f6;
  --color-cluster-1: #f59e0b;
  --color-cluster-2: #22c55e;
  --color-cluster-3: #ef4444;
  --color-cluster-4: #a855f7;
  --color-cluster-5: #06b6d4;
  --color-cluster-6: #ec4899;
  --color-cluster-7: #84cc16;
  --color-cluster-8: #f97316;
  --color-cluster-9: #6366f1;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  
  --text-xs: 0.675rem;
  --text-sm: 0.75rem;
  --text-base: 0.8125rem;
  --text-md: 0.875rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  --text-2xl: 1.375rem;
  --text-3xl: 1.75rem;
  
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  
  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-glow-blue: 0 0 20px rgba(59,130,246,0.3);
  --shadow-glow-amber: 0 0 20px rgba(245,158,11,0.3);
  
  /* Transitions */
  --transition-fast: 0.1s ease;
  --transition-base: 0.15s ease;
  --transition-slow: 0.25s ease;
  
  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 150;
  --z-modal: 200;
  --z-tooltip: 300;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-accent-cyan);
}

/* ========================================
   Layout Components
   ======================================== */

/* Page wrapper */
.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-subtle);
  backdrop-filter: blur(8px);
}

.header-title {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.header-title h1 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.header-title .subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Main content area */
.main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.main-full {
  flex: 1;
  padding: var(--space-6);
  overflow-y: auto;
}

.main-with-sidebar {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.sidebar-header h2 {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-text-primary);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-5);
}

.sidebar-section {
  margin-bottom: var(--space-6);
}

.sidebar-section:last-child {
  margin-bottom: 0;
}

.sidebar-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

/* Canvas/Graph container */
.canvas-container {
  flex: 1;
  position: relative;
  background: var(--color-bg-primary);
  overflow: hidden;
}

.canvas-container canvas,
.canvas-container svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* ========================================
   Card Components
   ======================================== */

.card {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-default);
  background: var(--color-bg-elevated);
}

.card-clickable {
  cursor: pointer;
}

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

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.card-body {
  padding: var(--space-4) var(--space-5);
}

.card-footer {
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-subtle);
}

/* Stat cards */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
}

.stat-card {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
}

.stat-value {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ========================================
   Button Components
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1;
  color: var(--color-text-secondary);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
  border-color: var(--color-border-emphasis);
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background: var(--color-accent-blue-muted);
  border-color: var(--color-accent-blue-muted);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-bg-tertiary);
  border-color: transparent;
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

.btn-icon {
  padding: var(--space-2);
  aspect-ratio: 1;
}

.btn.active {
  color: var(--color-accent-blue);
  background: rgba(59,130,246,0.1);
  border-color: rgba(59,130,246,0.3);
}

/* ========================================
   Form Components
   ======================================== */

.input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.input:focus {
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.input::placeholder {
  color: var(--color-text-faint);
}

.input-sm {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  padding-right: var(--space-8);
}

.label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

/* Search with autocomplete */
.search-container {
  position: relative;
}

.search-input {
  padding-left: var(--space-8);
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  pointer-events: none;
}

.search-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: var(--space-1);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 300px;
  overflow-y: auto;
  z-index: var(--z-dropdown);
  display: none;
}

.search-dropdown.show {
  display: block;
}

.search-result {
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: background var(--transition-fast);
}

.search-result:hover,
.search-result.highlighted {
  background: var(--color-bg-hover);
}

.search-result-name {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.search-result-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-left: auto;
}

.search-no-results {
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ========================================
   List Components
   ======================================== */

.list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.list-item:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-border-default);
}

.list-item:last-child {
  margin-bottom: 0;
}

.list-item-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.list-item-content {
  flex: 1;
  min-width: 0;
}

.list-item-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-item-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.list-item-badge {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  flex-shrink: 0;
}

/* ========================================
   Tooltip Component
   ======================================== */

.tooltip {
  position: fixed;
  z-index: var(--z-tooltip);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  max-width: 280px;
  line-height: var(--leading-relaxed);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.tooltip.show {
  opacity: 1;
}

.tooltip-title {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

/* Help icon with popup */
.help-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  color: var(--color-text-faint);
  font-size: 9px;
  font-weight: 700;
  cursor: help;
  margin-left: var(--space-1);
  position: relative;
}

.help-trigger:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-muted);
}

.help-popup {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 220px;
  padding: var(--space-3);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: var(--z-tooltip);
}

.help-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-border-default);
}

.help-trigger:hover .help-popup {
  opacity: 1;
  visibility: visible;
}

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

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: rgba(0,0,0,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform var(--transition-slow);
}

.modal-overlay.show .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
}

.modal-header h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--space-1);
  line-height: 1;
  transition: color var(--transition-fast);
}

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

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
}

.modal-body p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

/* ========================================
   Badge & Tag Components
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
}

.badge-blue { background: rgba(59,130,246,0.15); color: var(--color-accent-blue); }
.badge-amber { background: rgba(245,158,11,0.15); color: var(--color-accent-amber); }
.badge-red { background: rgba(239,68,68,0.15); color: var(--color-accent-red); }
.badge-green { background: rgba(34,197,94,0.15); color: var(--color-accent-green); }

/* ========================================
   Legend Component
   ======================================== */

.legend {
  position: fixed;
  bottom: var(--space-5);
  left: var(--space-5);
  z-index: var(--z-sticky);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  width: 200px;
  transition: width var(--transition-base);
}

.legend.collapsed {
  width: 44px;
}

.legend-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-bg-tertiary);
  border: none;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.legend-toggle:hover {
  background: var(--color-bg-hover);
}

.legend-toggle svg {
  flex-shrink: 0;
}

.legend.collapsed .legend-toggle span {
  display: none;
}

.legend-content {
  padding: var(--space-3);
}

.legend.collapsed .legend-content {
  display: none;
}

.legend-section {
  margin-bottom: var(--space-4);
}

.legend-section:last-child {
  margin-bottom: 0;
}

.legend-section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-2);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) 0;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.legend-line {
  width: 16px;
  height: 3px;
  border-radius: 1px;
  flex-shrink: 0;
}

.legend-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ========================================
   Controls Bar
   ======================================== */

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border-subtle);
}

.control-group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.control-group .label {
  margin-bottom: 0;
  white-space: nowrap;
}

.control-divider {
  width: 1px;
  height: 24px;
  background: var(--color-border-subtle);
}

/* ========================================
   Progress & Meter
   ======================================== */

.progress-bar {
  height: 4px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-accent-blue);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.meter {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.meter-bar {
  flex: 1;
  height: 6px;
  background: var(--color-bg-primary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.meter-fill {
  height: 100%;
  border-radius: var(--radius-full);
}

.meter-fill-low { background: var(--color-accent-green); }
.meter-fill-medium { background: var(--color-accent-amber); }
.meter-fill-high { background: var(--color-accent-red); }

.meter-value {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  min-width: 36px;
  text-align: right;
}

/* ========================================
   Empty States
   ======================================== */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  text-align: center;
}

.empty-state-icon {
  width: 48px;
  height: 48px;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.empty-state-title {
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 300px;
}

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

@media (max-width: 768px) {
  :root {
    --space-6: 1rem;
  }
  
  .header {
    padding: var(--space-3) var(--space-4);
  }
  
  .header-title h1 {
    font-size: var(--text-md);
  }
  
  .sidebar {
    position: fixed;
    right: -100%;
    top: 0;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    z-index: var(--z-modal);
    transition: right var(--transition-slow);
  }
  
  .sidebar.open {
    right: 0;
  }
  
  .sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: calc(var(--z-modal) - 1);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
  }
  
  .sidebar-backdrop.show {
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .controls {
    padding: var(--space-2) var(--space-4);
    gap: var(--space-2);
  }
  
  .legend {
    left: var(--space-3);
    bottom: var(--space-3);
  }
  
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) {
  .mobile-menu-btn {
    display: none;
  }
  
  .sidebar-backdrop {
    display: none;
  }
}

/* ========================================
   Utility Classes
   ======================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-mono { font-family: var(--font-mono); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}