/* ===== DESIGN SYSTEM ===== */
:root {
  /* Couleurs - Mode clair */
  --color-primary-50: #e8f4fd;
  --color-primary-100: #c1e2fa;
  --color-primary-200: #97cef5;
  --color-primary-300: #6bb8ef;
  --color-primary-400: #4aa5e8;
  --color-primary-500: #2196ec;
  --color-primary-600: #1e88e1;
  --color-primary-700: #1976d2;
  --color-primary-800: #1565c0;
  --color-primary-900: #0d47a1;
  
  --color-secondary-50: #f3e5f5;
  --color-secondary-100: #e1bee7;
  --color-secondary-200: #ce93d8;
  --color-secondary-300: #ba68c8;
  --color-secondary-400: #ab47bc;
  --color-secondary-500: #9c27b0;
  --color-secondary-600: #8e24aa;
  --color-secondary-700: #7b1fa2;
  --color-secondary-800: #6a1b9a;
  --color-secondary-900: #4a148c;
  
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #eeeeee;
  --color-neutral-300: #e0e0e0;
  --color-neutral-400: #bdbdbd;
  --color-neutral-500: #9e9e9e;
  --color-neutral-600: #757575;
  --color-neutral-700: #616161;
  --color-neutral-800: #424242;
  --color-neutral-900: #212121;
  
  --color-success: #4caf50;
  --color-warning: #ff9800;
  --color-error: #f44336;
  --color-info: #2196f3;
  
  /* Sémantique */
  --color-background: #ffffff;
  --color-surface: #fafafa;
  --color-surface-alt: #f5f5f5;
  --color-text-primary: #212121;
  --color-text-secondary: #757575;
  --color-text-disabled: #bdbdbd;
  --color-border: #e0e0e0;
  --color-border-strong: #bdbdbd;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-overlay: rgba(0, 0, 0, 0.5);
  
  /* Typographie */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  --font-family-serif: Georgia, Cambria, 'Times New Roman', Times, serif;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --font-weight-light: 300;
  --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;
  
  /* Espacement */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  
  /* Bordures */
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.5rem;    /* 8px */
  --border-radius-lg: 0.75rem;   /* 12px */
  --border-radius-xl: 1rem;      /* 16px */
  --border-radius-2xl: 1.5rem;   /* 24px */
  --border-radius-full: 9999px;
  
  /* Ombres */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(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;
}

/* Mode sombre */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #121212;
    --color-surface: #1e1e1e;
    --color-surface-alt: #2d2d2d;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-text-disabled: #666666;
    --color-border: #404040;
    --color-border-strong: #666666;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.7);
  }
}

/* Thème sombre forcé */
body.dark-theme {
  --color-background: #121212;
  --color-surface: #1e1e1e;
  --color-surface-alt: #2d2d2d;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b3b3b3;
  --color-text-disabled: #666666;
  --color-border: #404040;
  --color-border-strong: #666666;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.7);
}

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

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

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

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img,
svg {
  height: auto;
}

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

.sr-only {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-mono { font-family: var(--font-family-mono); }
.font-serif { font-family: var(--font-family-serif); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-text-secondary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-info { color: var(--color-info); }

.bg-primary { background-color: var(--color-primary-600); }
.bg-secondary { background-color: var(--color-secondary-600); }
.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-error { background-color: var(--color-error); }
.bg-info { background-color: var(--color-info); }

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* ===== HEADER & NAVIGATION ===== */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  background-color: rgba(var(--color-surface), 0.9);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-logo {
  width: 40px;
  height: 40px;
  color: var(--color-primary-600);
}

.nav-title {
  color: inherit;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-text-primary);
  background-color: var(--color-surface-alt);
  outline: none;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

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

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  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(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  background-color: transparent;
  color: inherit;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-700);
}

.btn-secondary {
  background-color: var(--color-secondary-600);
  color: white;
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-700);
}

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

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-surface-alt);
}

.btn-ghost {
  color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-surface-alt);
  color: var(--color-text-primary);
}

.btn-icon {
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-md);
  background-color: transparent;
  border: 1px solid transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover:not(:disabled),
.btn-icon:focus-visible {
  background-color: var(--color-surface-alt);
  color: var(--color-text-primary);
}

.btn-icon:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Theme toggle */
.icon-sun,
.icon-moon {
  width: 20px;
  height: 20px;
}

.dark-theme .icon-sun {
  display: none;
}

:not(.dark-theme) .icon-moon {
  display: none;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-secondary-50) 100%);
  position: relative;
  overflow: hidden;
}

.dark-theme .hero {
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-secondary-900) 100%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.hero-content {
  z-index: 1;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-tight);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

@media (max-width: 768px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-actions {
    justify-content: center;
  }
}

/* ===== SECTIONS ===== */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-alt {
  background-color: var(--color-surface-alt);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

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

/* ===== FILTERS ===== */
.filters-panel {
  margin-bottom: var(--spacing-xl);
}

.filters-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: flex-end;
  margin-bottom: var(--spacing-md);
}

.search-box {
  flex: 1;
  min-width: 250px;
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(33, 150, 236, 0.1);
}

.filter-groups {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

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

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

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
  min-width: 150px;
  cursor: pointer;
}

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

.active-filters {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-primary-100);
  color: var(--color-primary-800);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.dark-theme .filter-chip {
  background-color: var(--color-primary-900);
  color: var(--color-primary-200);
}

.filter-chip button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== CARDS ===== */
.dinosaur-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

.card:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  line-height: var(--line-height-tight);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.card-content {
  margin-bottom: var(--spacing-md);
}

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

.card-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-700);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dark-theme .card-tag {
  background-color: var(--color-neutral-800);
  color: var(--color-neutral-300);
}

.card-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

.stat-value {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.card-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* ===== TIMELINE ===== */
.timeline-container {
  position: relative;
  margin: var(--spacing-xl) 0;
}

.timeline-controls {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  justify-content: center;
}

.timeline-svg {
  width: 100%;
  height: 300px;
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.timeline-legend {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: var(--border-radius-sm);
}

/* ===== TABS ===== */
.calculations-tabs,
.docs-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
  overflow-x: auto;
}

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

.tab-btn:hover,
.doc-tab-btn:hover {
  color: var(--color-text-primary);
  background-color: var(--color-surface-alt);
}

.tab-btn[aria-selected="true"],
.doc-tab-btn[aria-selected="true"] {
  color: var(--color-primary-600);
  border-bottom-color: var(--color-primary-600);
}

.tab-panel,
.doc-panel {
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
}

.doc-content {
  max-height: 500px;
  overflow-y: auto;
  margin-bottom: var(--spacing-md);
}

/* ===== CALCULATION TOOLS ===== */
.calculation-tools {
  margin-top: var(--spacing-2xl);
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
}

.tool-card h4 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.tool-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.tool-form label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.tool-form input[type="number"] {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  background-color: var(--color-background);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-base);
}

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

.toggle-switch {
  display: flex;
  gap: var(--spacing-md);
}

.toggle-switch input[type="radio"] {
  margin-right: var(--spacing-xs);
}

.calculation-result {
  padding: var(--spacing-md);
  background-color: var(--color-surface-alt);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

/* ===== MODALS ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal[aria-hidden="true"] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-overlay);
  z-index: var(--z-modal-backdrop);
}

.modal-container {
  position: relative;
  background-color: var(--color-surface);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 600px;
  max-height: 90vh;
  width: 100%;
  overflow: hidden;
  z-index: var(--z-modal);
}

.modal-large {
  max-width: 900px;
}

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

.modal-title {
  margin: 0;
  color: var(--color-text-primary);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  line-height: 1;
}

.modal-body {
  padding: var(--spacing-lg);
  max-height: calc(90vh - 140px);
  overflow-y: auto;
}

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

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
}

.pagination button {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination button:hover:not(:disabled) {
  background-color: var(--color-surface-alt);
}

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

.pagination button.active {
  background-color: var(--color-primary-600);
  color: white;
  border-color: var(--color-primary-600);
}

/* ===== FAQ ===== */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  border: none;
  text-align: left;
  font-family: inherit;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question:hover {
  background-color: var(--color-surface-alt);
}

.faq-question::after {
  content: '+';
  font-size: var(--font-size-xl);
  transition: transform var(--transition-fast);
}

.faq-question[aria-expanded="true"]::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--spacing-lg);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.faq-answer p {
  padding: var(--spacing-lg);
  margin: 0;
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ===== TESTS ===== */
.test-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.test-results,
.calculation-verification {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

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

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

.test-name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.test-status {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
}

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

.test-status.fail {
  background-color: var(--color-error);
  color: white;
}

.test-details {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--color-surface-alt);
  border-radius: var(--border-radius-md);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--color-surface-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

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

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

.footer-section ul li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: var(--color-primary-600);
  text-decoration: none;
}

.footer-section a:hover {
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

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

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

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

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

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

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

/* Focus visible pour tous les éléments interactifs */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .section-title {
    font-size: var(--font-size-3xl);
  }
  
  .dinosaur-grid {
    grid-template-columns: 1fr;
  }
  
  .filters-container {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filter-groups {
    justify-content: stretch;
  }
  
  .filter-group {
    flex: 1;
  }
  
  .modal-container {
    margin: var(--spacing-md);
    max-width: calc(100% - 2 * var(--spacing-md));
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .nav-container {
    padding: var(--spacing-sm) 0;
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .card-stats {
    grid-template-columns: 1fr;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== PRINT ===== */
@media print {
  .header,
  .nav-controls,
  .hero-actions,
  .filter-actions,
  .card-actions,
  .modal,
  .toast-container,
  .pagination {
    display: none !important;
  }
  
  .dinosaur-grid {
    display: block;
  }
  
  .card {
    break-inside: avoid;
    margin-bottom: var(--spacing-lg);
  }
  
  body {
    color: black;
    background: white;
  }
  
  .card,
  .tool-card,
  .tab-panel,
  .doc-panel {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}