/* ==========================================================================
   DinoExplorer - Système de Design Premium
   Design System complet avec support thème clair/sombre
   ========================================================================== */

/* ==========================================================================
   Variables CSS - Système de Design
   ========================================================================== */

:root {
  /* Couleurs principales */
  --color-primary: hsl(210 100% 50%);
  --color-secondary: hsl(260 100% 60%);
  --color-accent: hsl(45 100% 50%);
  
  /* Couleurs sémantiques */
  --color-success: hsl(142 76% 36%);
  --color-warning: hsl(38 92% 50%);
  --color-error: hsl(0 84% 60%);
  --color-info: hsl(204 94% 94%);
  
  /* Thème clair */
  --bg-primary: hsl(0 0% 100%);
  --bg-secondary: hsl(210 20% 98%);
  --bg-tertiary: hsl(210 15% 95%);
  
  --text-primary: hsl(220 15% 15%);
  --text-secondary: hsl(220 10% 45%);
  --text-tertiary: hsl(220 5% 65%);
  
  --border-primary: hsl(210 15% 90%);
  --border-secondary: hsl(210 10% 85%);
  
  /* Échelle des espaces */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Typographie */
  --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Ombres */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* Thème sombre */
[data-theme="dark"] {
  --bg-primary: hsl(220 15% 8%);
  --bg-secondary: hsl(220 15% 12%);
  --bg-tertiary: hsl(220 15% 16%);
  
  --text-primary: hsl(0 0% 98%);
  --text-secondary: hsl(220 5% 65%);
  --text-tertiary: hsl(220 5% 45%);
  
  --border-primary: hsl(220 10% 20%);
  --border-secondary: hsl(220 10% 15%);
  
  --color-info: hsl(204 80% 20%);
}

/* ==========================================================================
   Reset et base
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* ==========================================================================
   Utilitaires
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.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;
}

.not-sr-only {
  position: static;
  width: auto;
  height: auto;
  padding: 0;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ==========================================================================
   Composants UI
   ========================================================================== */

/* Boutons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: hsl(210 100% 45%);
  border-color: hsl(210 100% 45%);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-secondary);
  border-color: var(--border-secondary);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-secondary);
  border-color: var(--color-primary);
}

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--radius-full);
}

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

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

/* Icônes */
.icon {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  flex-shrink: 0;
}

.icon-sm {
  width: 0.875rem;
  height: 0.875rem;
}

.icon-lg {
  width: 1.25rem;
  height: 1.25rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: rgba(var(--bg-primary), 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  padding: 0 var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-logo {
  width: 2rem;
  height: 2rem;
  color: var(--color-primary);
}

.nav-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

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

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-svg {
  width: 100%;
  height: 100%;
  color: var(--color-primary);
  opacity: 0.3;
}

.hero-content {
  max-width: 800px;
  padding: var(--space-4xl) var(--space-lg);
  z-index: 1;
}

.hero-title {
  font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ==========================================================================
   Controls Panel
   ========================================================================== */

.controls-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
  box-shadow: var(--shadow-sm);
}

.search-box {
  position: relative;
  margin-bottom: var(--space-lg);
}

.search-box input {
  width: 100%;
  padding: var(--space-md) var(--space-md) var(--space-md) 2.5rem;
  font-size: var(--font-size-base);
  background-color: var(--bg-primary);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.search-box input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px hsla(210, 100%, 50%, 0.1);
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-tertiary);
}

.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  align-items: end;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.filter-group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.filter-group select {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  background-color: var(--bg-primary);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* ==========================================================================
   Timeline
   ========================================================================== */

.timeline-container {
  margin-bottom: var(--space-2xl);
}

.timeline-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  text-align: center;
}

.timeline {
  position: relative;
  height: 100px;
  background: linear-gradient(90deg, 
    var(--color-primary) 0%, 
    var(--color-secondary) 50%, 
    var(--color-accent) 100%);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.timeline-axis {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.timeline-marker {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  text-align: center;
  color: white;
}

.timeline-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-xs);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.timeline-era {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Cards Grid
   ========================================================================== */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.dinosaur-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  border: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

.dinosaur-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.card-period {
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-meta {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.card-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  text-transform: capitalize;
}

.card-tag.carnivore {
  background-color: hsl(0 84% 95%);
  color: hsl(0 84% 40%);
}

[data-theme="dark"] .card-tag.carnivore {
  background-color: hsl(0 84% 15%);
  color: hsl(0 84% 70%);
}

.card-tag.herbivore {
  background-color: hsl(142 76% 95%);
  color: hsl(142 76% 30%);
}

[data-theme="dark"] .card-tag.herbivore {
  background-color: hsl(142 76% 15%);
  color: hsl(142 76% 60%);
}

.card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Results Summary
   ========================================================================== */

.results-summary {
  text-align: center;
  padding: var(--space-lg);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-primary);
}

.results-summary span {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

/* ==========================================================================
   Calculation Tabs
   ========================================================================== */

.calculation-tabs,
.docs-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-primary);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
}

.tab-btn {
  padding: var(--space-md) var(--space-lg);
  background: none;
  border: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content,
.docs-content {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
}

.tab-panel,
.docs-panel {
  display: none;
}

.tab-panel.active,
.docs-panel.active {
  display: block;
}

/* ==========================================================================
   Formules et Calculs
   ========================================================================== */

.method-description {
  margin-bottom: var(--space-xl);
}

.method-description h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.method-description p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.formula {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--text-primary);
  margin: var(--space-lg) 0;
}

.method-parameters h4,
.example-calculation h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.parameter {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
}

.calculation-steps {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.calculation-step {
  margin-bottom: var(--space-md);
}

.calculation-step:last-child {
  margin-bottom: 0;
}

.step-label {
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.step-value {
  font-family: var(--font-family-mono);
  color: var(--color-primary);
  background-color: var(--bg-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.method-toggle {
  display: flex;
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.method-toggle label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.method-toggle input[type="radio"] {
  accent-color: var(--color-primary);
}

/* ==========================================================================
   Timeline Explanation
   ========================================================================== */

.timeline-explanation {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.timeline-explanation ul {
  list-style: none;
  padding: 0;
}

.timeline-explanation li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-primary);
}

.timeline-explanation li:last-child {
  border-bottom: none;
}

/* ==========================================================================
   Comparison
   ========================================================================== */

.comparison-controls {
  display: flex;
  gap: var(--space-md);
  align-items: end;
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.species-selector {
  flex: 1;
  min-width: 300px;
}

.species-selector label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

#comparison-select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  background-color: var(--bg-secondary);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  min-height: 120px;
}

#comparison-select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.comparison-results {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid var(--border-primary);
}

.comparison-placeholder {
  text-align: center;
  color: var(--text-secondary);
  padding: var(--space-2xl);
}

/* ==========================================================================
   Tests
   ========================================================================== */

.tests-controls {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.tests-results {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid var(--border-primary);
}

.tests-placeholder {
  text-align: center;
  color: var(--text-secondary);
  padding: var(--space-2xl);
}

.test-result {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
}

.test-result.success {
  background-color: hsl(142 76% 95%);
  color: hsl(142 76% 30%);
  border: 1px solid hsl(142 76% 80%);
}

.test-result.failure {
  background-color: hsl(0 84% 95%);
  color: hsl(0 84% 40%);
  border: 1px solid hsl(0 84% 80%);
}

.test-result.info {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.test-status {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.test-result.success .test-status {
  background-color: var(--color-success);
}

.test-result.failure .test-status {
  background-color: var(--color-error);
}

.test-result.info .test-status {
  background-color: var(--color-primary);
}

/* ==========================================================================
   Documentation
   ========================================================================== */

.docs-content-wrapper {
  max-width: none;
}

.docs-content-wrapper h1,
.docs-content-wrapper h2,
.docs-content-wrapper h3 {
  color: var(--text-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
}

.docs-content-wrapper h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

.docs-content-wrapper h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

.docs-content-wrapper h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

.docs-content-wrapper p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.docs-content-wrapper ul,
.docs-content-wrapper ol {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.docs-content-wrapper li {
  margin-bottom: var(--space-sm);
}

.docs-content-wrapper code {
  font-family: var(--font-family-mono);
  background-color: var(--bg-tertiary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.docs-export {
  text-align: center;
  margin-top: var(--space-xl);
}

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

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-2xl);
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.modal-close {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--space-xl);
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-lg);
  max-width: 400px;
  animation: toastSlideIn 0.3s ease-out;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-error);
}

.toast.info {
  border-left: 4px solid var(--color-primary);
}

.toast.warning {
  border-left: 4px solid var(--color-warning);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  background-color: var(--bg-tertiary);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-4xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.footer-section p {
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: var(--space-sm);
}

.footer-section ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-primary);
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.footer-bottom p {
  margin-bottom: var(--space-xs);
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Loading Screen
   ========================================================================== */

.loading-screen {
  position: fixed;
  inset: 0;
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  transition: opacity var(--transition-normal);
}

.loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--border-primary);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-lg);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
  
  .nav {
    padding: 0 var(--space-md);
  }
  
  .hero-content {
    padding: var(--space-2xl) var(--space-md);
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .controls-panel {
    padding: var(--space-lg);
  }
  
  .filters {
    grid-template-columns: 1fr;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .comparison-controls {
    flex-direction: column;
  }
  
  .tests-controls {
    flex-direction: column;
  }
  
  .modal-content {
    margin: var(--space-md);
    max-height: calc(100vh - 2rem);
  }
  
  .toast-container {
    left: var(--space-md);
    right: var(--space-md);
  }
}

@media (max-width: 480px) {
  .nav-brand .nav-title {
    display: none;
  }
  
  .calculation-tabs,
  .docs-tabs {
    flex-wrap: nowrap;
  }
  
  .tab-btn {
    flex-shrink: 0;
  }
}

/* ==========================================================================
   Animations et Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Focus Visible (Accessibilité)
   ========================================================================== */

.btn:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .header,
  .hero,
  .modal,
  .toast-container {
    display: none !important;
  }
  
  .section {
    padding: var(--space-lg) 0;
    break-inside: avoid;
  }
  
  .dinosaur-card {
    break-inside: avoid;
    margin-bottom: var(--space-md);
  }
}

/* ==========================================================================
   Fin du CSS
   ========================================================================== */