/* ==============================================
   DINOSAURES - STYLES CSS PREMIUM
   Design System Complet avec Accessibilité
   ============================================== */

/* CSS Variables & Design Tokens */
:root {
  /* Color System - Light Mode */
  --color-primary: #2563eb;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  --color-secondary: #7c3aed;
  --color-secondary-50: #f5f3ff;
  --color-secondary-100: #ede9fe;
  --color-secondary-200: #ddd6fe;
  --color-secondary-300: #c4b5fd;
  --color-secondary-400: #a78bfa;
  --color-secondary-500: #8b5cf6;
  --color-secondary-600: #7c3aed;
  --color-secondary-700: #6d28d9;
  --color-secondary-800: #5b21b6;
  --color-secondary-900: #4c1d95;

  --color-success: #059669;
  --color-warning: #d97706;
  --color-error: #dc2626;
  --color-info: #0284c7;

  /* Grayscale */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-black: #000000;

  /* Semantic Colors */
  --color-background: var(--color-white);
  --color-surface: var(--color-gray-50);
  --color-surface-hover: var(--color-gray-100);
  --color-border: var(--color-gray-200);
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-500);
  --color-text-inverse: var(--color-white);

  /* Status Colors */
  --color-carnivore: #e74c3c;
  --color-herbivore: #27ae60;
  --color-omnivore: #f39c12;

  /* Typography Scale */
  --font-family-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "SF Mono", "Monaco", "Inconsolata", "Fira Code", "Courier New", monospace;

  --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-size-6xl: 3.75rem;    /* 60px */

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Spacing Scale */
  --space-0: 0;
  --space-px: 1px;
  --space-0-5: 0.125rem;  /* 2px */
  --space-1: 0.25rem;     /* 4px */
  --space-1-5: 0.375rem;  /* 6px */
  --space-2: 0.5rem;      /* 8px */
  --space-2-5: 0.625rem;  /* 10px */
  --space-3: 0.75rem;     /* 12px */
  --space-3-5: 0.875rem;  /* 14px */
  --space-4: 1rem;        /* 16px */
  --space-5: 1.25rem;     /* 20px */
  --space-6: 1.5rem;      /* 24px */
  --space-7: 1.75rem;     /* 28px */
  --space-8: 2rem;        /* 32px */
  --space-9: 2.25rem;     /* 36px */
  --space-10: 2.5rem;     /* 40px */
  --space-12: 3rem;       /* 48px */
  --space-16: 4rem;       /* 64px */
  --space-20: 5rem;       /* 80px */
  --space-24: 6rem;       /* 96px */
  --space-28: 7rem;       /* 112px */
  --space-32: 8rem;       /* 128px */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-base: 0.25rem;  /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-2xl: 0 50px 100px -20px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* Z-Index Scale */
  --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;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-background: var(--color-gray-900);
  --color-surface: var(--color-gray-800);
  --color-surface-hover: var(--color-gray-700);
  --color-border: var(--color-gray-700);
  --color-text-primary: var(--color-white);
  --color-text-secondary: var(--color-gray-300);
  --color-text-tertiary: var(--color-gray-400);
  --color-text-inverse: var(--color-gray-900);

  --color-primary-50: #1e3a8a;
  --color-primary-100: #1e40af;
  --color-primary-200: #1d4ed8;
  --color-primary-300: #2563eb;
  --color-primary-400: #3b82f6;
  --color-primary-500: #60a5fa;
  --color-primary-600: #93c5fd;
  --color-primary-700: #bfdbfe;
  --color-primary-800: #dbeafe;
  --color-primary-900: #eff6ff;
}

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

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
}

h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

h6 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-relaxed);
}

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

a:hover,
a:focus {
  color: var(--color-primary-700);
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Utility Classes */
.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;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

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

.btn:focus {
  outline: 2px solid transparent;
  outline-offset: 2px;
  box-shadow: 0 0 0 2px var(--color-background), 0 0 0 4px var(--color-primary);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-800));
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-primary-300);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: none;
}

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

.btn-icon {
  padding: var(--space-3);
  border-radius: var(--radius-full);
}

.btn-large {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.btn-small {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
  border-radius: var(--radius-base);
}

/* Header & Navigation */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}

[data-theme="dark"] .header {
  background: rgba(17, 24, 39, 0.95);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
}

.nav-icon {
  color: var(--color-primary);
}

.nav-links {
  display: none;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link:focus::after {
  width: 80%;
}

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

.sun-icon {
  display: none;
}

[data-theme="light"] .sun-icon {
  display: block;
}

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

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

[data-theme="dark"] .moon-icon {
  display: block;
}

/* Main Content */
.main {
  min-height: 100vh;
}

.section {
  padding: var(--space-20) 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-6);
  max-width: 3xl;
  margin-left: auto;
  margin-right: auto;
}

.section-description {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
  max-width: 2xl;
  margin-left: auto;
  margin-right: auto;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, 
    var(--color-primary-50) 0%, 
    var(--color-secondary-50) 50%, 
    var(--color-primary-100) 100%);
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.hero-decoration {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(-50%, -50%) translateY(0px); }
  50% { transform: translate(-50%, -50%) translateY(-20px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 4xl;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.hero-title {
  font-size: clamp(var(--font-size-4xl), 8vw, var(--font-size-6xl));
  font-weight: var(--font-weight-extrabold);
  background: linear-gradient(135deg, var(--color-primary-700), var(--color-secondary-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
}

@media (min-width: 640px) {
  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* Explorer Section */
.explorer-controls {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .explorer-controls {
    grid-template-columns: 1fr 2fr;
    align-items: end;
  }
}

.search-container {
  position: relative;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  color: var(--color-text-tertiary);
  pointer-events: none;
  z-index: 1;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-left: 3rem;
  padding-right: 3rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-background);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
  outline: none;
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-clear {
  position: absolute;
  right: var(--space-3);
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.search-clear:hover {
  background: var(--color-surface);
  color: var(--color-text-secondary);
}

.filters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.filter-select {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-background);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-base);
  outline: none;
  cursor: pointer;
}

.filter-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.results-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

#results-count {
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

/* Dinosaur Grid */
.dinosaur-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

.dinosaur-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.dinosaur-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-200);
}

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

.dinosaur-card-header {
  padding: var(--space-6);
  background: linear-gradient(135deg, 
    var(--color-primary-50), 
    var(--color-secondary-50));
  position: relative;
}

.dinosaur-card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.dinosaur-card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.dinosaur-card-meta {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.dinosaur-card-body {
  padding: var(--space-6);
}

.dinosaur-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

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

.dinosaur-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

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

.dinosaur-calculations {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.calc-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.calc-item-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.calc-item-value {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* Timeline Section */
.timeline-container {
  background: var(--color-background);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.timeline-controls {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-4);
}

.timeline-svg-container {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-surface);
  margin-bottom: var(--space-4);
}

.timeline-svg {
  width: 100%;
  height: 400px;
  display: block;
}

.timeline-legend {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
}

/* Calculations Section */
.calculations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}

.calc-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.calc-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-200);
}

.calc-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.calc-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.calc-formula {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  text-align: center;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

.calc-controls {
  margin-bottom: var(--space-4);
}

.calc-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  cursor: pointer;
  font-size: var(--font-size-sm);
}

.calculations-panel,
.verification-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-top: var(--space-8);
}

.verification-panel h3,
.calculations-panel h3 {
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.calc-form-container {
  min-height: 200px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: var(--color-background);
}

.verification-results {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: var(--color-background);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  max-height: 300px;
  overflow-y: auto;
}

/* Documentation Section */
.docs-tabs {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.docs-tab-list {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  overflow-x: auto;
}

.docs-tab {
  padding: var(--space-4) var(--space-6);
  background: none;
  border: none;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

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

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

.docs-content {
  position: relative;
}

.docs-panel {
  display: none;
  padding: var(--space-6);
  position: relative;
}

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

.markdown-content {
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
  color: var(--color-text-primary);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.markdown-content h1:first-child,
.markdown-content h2:first-child,
.markdown-content h3:first-child {
  margin-top: 0;
}

.markdown-content ul,
.markdown-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.markdown-content li {
  margin-bottom: var(--space-2);
}

.markdown-content code {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-family-mono);
  font-size: 0.875em;
  color: var(--color-primary);
}

.markdown-content pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  overflow-x: auto;
  margin: var(--space-4) 0;
}

.markdown-content pre code {
  background: none;
  border: none;
  padding: 0;
}

.export-doc-btn {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: var(--space-20);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

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

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

.footer-licenses {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.license {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-base);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.footer-credits {
  list-style: none;
  padding: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-credits li {
  margin-bottom: var(--space-2);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-background);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-large {
  width: min(800px, 90vw);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

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

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-base);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

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

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

/* Loading */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: var(--z-toast);
  flex-direction: column;
  gap: var(--space-4);
}

.loading.active {
  display: flex;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top: 4px solid var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

.loading-text {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* Tests */
.tests-controls {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.tests-results {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
}

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

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

.test-info {
  color: var(--color-info);
}

/* Responsive Design */
@media (max-width: 640px) {
  .hero-actions {
    width: 100%;
  }
  
  .btn-large {
    width: 100%;
    justify-content: center;
  }
  
  .results-summary {
    flex-direction: column;
    gap: var(--space-3);
    align-items: stretch;
  }
  
  .timeline-controls {
    justify-content: stretch;
  }
  
  .timeline-controls .btn {
    flex: 1;
  }
  
  .calculations-grid {
    grid-template-columns: 1fr;
  }
  
  .tests-controls {
    flex-direction: column;
  }
  
  .tests-controls .btn {
    width: 100%;
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .hero-actions,
  .nav-controls,
  .modal,
  .loading {
    display: none !important;
  }
  
  .hero {
    min-height: auto;
    padding: var(--space-8) 0;
  }
  
  .section {
    padding: var(--space-8) 0;
  }
  
  .dinosaur-card {
    break-inside: avoid;
    margin-bottom: var(--space-4);
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
  }
  
  .btn:focus,
  .nav-link:focus,
  .search-input:focus,
  .filter-select:focus {
    outline: 3px solid #000000;
    outline-offset: 2px;
  }
}