/* ===== CSS VARIABLES (DESIGN SYSTEM) ===== */
:root {
  /* Colors - Light theme */
  --color-primary: #4a90e2;
  --color-primary-hover: #357abd;
  --color-secondary: #7b68ee;
  --color-secondary-hover: #6454d4;
  --color-accent: #ff6b6b;
  --color-accent-hover: #ff5252;
  
  --color-surface: #ffffff;
  --color-surface-hover: #f8f9fa;
  --color-surface-active: #e9ecef;
  --color-overlay: rgba(0, 0, 0, 0.5);
  
  --color-text-primary: #212529;
  --color-text-secondary: #6c757d;
  --color-text-muted: #adb5bd;
  --color-text-inverse: #ffffff;
  
  --color-border: #dee2e6;
  --color-border-light: #e9ecef;
  --color-border-focus: var(--color-primary);
  
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-error: #dc3545;
  --color-info: #17a2b8;
  
  /* Period colors for timeline */
  --color-triassic: #ff6b6b;
  --color-jurassic: #4ecdc4;
  --color-cretaceous: #45b7d1;
  
  /* Typography */
  --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, 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-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;
  
  /* Spacing */
  --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 */
  
  /* Border radius */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows */
  --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);
  
  /* 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;
  
  /* Grid */
  --grid-columns: 12;
  --grid-gutter: var(--spacing-lg);
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #1a1a1a;
    --color-surface-hover: #2d2d2d;
    --color-surface-active: #3d3d3d;
    --color-overlay: rgba(0, 0, 0, 0.7);
    
    --color-text-primary: #e9ecef;
    --color-text-secondary: #adb5bd;
    --color-text-muted: #6c757d;
    
    --color-border: #495057;
    --color-border-light: #343a40;
  }
}

/* Manual dark theme toggle */
body.dark-theme {
  --color-surface: #1a1a1a;
  --color-surface-hover: #2d2d2d;
  --color-surface-active: #3d3d3d;
  --color-overlay: rgba(0, 0, 0, 0.7);
  
  --color-text-primary: #e9ecef;
  --color-text-secondary: #adb5bd;
  --color-text-muted: #6c757d;
  
  --color-border: #495057;
  --color-border-light: #343a40;
}

/* ===== 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-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

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

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

/* ===== ACCESSIBILITY ===== */
/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Screen reader only content */
.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;
}

/* Reduced 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;
  }
}

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

/* Grid system */
.grid {
  display: grid;
  gap: var(--grid-gutter);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
.grid-cols-12 { grid-template-columns: repeat(12, 1fr); }

/* Flexbox utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

/* ===== COMPONENTS ===== */

/* Header */
.header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  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);
}

.brand-icon {
  font-size: var(--font-size-2xl);
}

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

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

.nav-menu a {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.3);
}

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

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

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

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--color-secondary-hover);
}

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

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: var(--radius-md);
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.btn-icon:hover,
.btn-icon:focus {
  background-color: var(--color-surface-hover);
  color: var(--color-text-primary);
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: inherit;
  padding: 0;
  text-decoration: underline;
}

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

.btn-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

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

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-2xl);
  opacity: 0.9;
}

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

.hero-visual {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.3;
}

.hero-svg {
  width: 100%;
  height: 100%;
}

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

.section:nth-child(even) {
  background-color: var(--color-surface-hover);
}

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

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

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

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

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

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

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

.card-content {
  color: var(--color-text-secondary);
}

.card-footer {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.dinosaur-card {
  cursor: pointer;
  transition: all var(--transition-normal);
}

.dinosaur-card:hover {
  transform: translateY(-4px);
}

.dinosaur-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
  color: var(--color-primary);
}

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

.dinosaur-tag {
  font-size: var(--font-size-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-surface-hover);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
}

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

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

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

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

/* Filters */
.filters-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

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

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

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

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

.filter-select,
.search-input {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
}

.filter-select:focus,
.search-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

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

.active-filter {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
}

.active-filter button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: var(--font-size-lg);
  line-height: 1;
  padding: 0;
}

/* Timeline */
.timeline-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  overflow: hidden;
}

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

.timeline-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

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

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

.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(--radius-sm);
}

/* Calculations */
.calculations-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
}

.calc-tabs {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
}

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

.calc-tab:hover,
.calc-tab:focus {
  color: var(--color-primary);
}

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

.calc-content {
  min-height: 400px;
}

.calc-panel {
  display: none;
}

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

.calc-formula {
  background-color: var(--color-surface-hover);
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.formula-display {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  text-align: center;
}

.calc-interactive {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.calc-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

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

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

.input-group input,
.input-group select {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
}

.calc-result {
  padding: var(--spacing-md);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

.calc-references {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.calc-references ul {
  list-style: none;
  padding: 0;
}

.calc-references li {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
  position: relative;
}

.calc-references li::before {
  content: "📄";
  position: absolute;
  left: 0;
}

/* Compare */
.compare-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
}

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

.species-select {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
}

.compare-table {
  overflow-x: auto;
  margin-bottom: var(--spacing-xl);
}

.compare-charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
}

.chart-container {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  text-align: center;
}

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

/* Documentation */
.docs-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
}

.docs-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
}

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

.docs-tab:hover,
.docs-tab:focus {
  color: var(--color-primary);
}

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

.docs-content {
  min-height: 500px;
  margin-bottom: var(--spacing-lg);
}

.docs-panel {
  display: none;
}

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

.docs-panel h1,
.docs-panel h2,
.docs-panel h3,
.docs-panel h4 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.docs-panel h1 { font-size: var(--font-size-3xl); }
.docs-panel h2 { font-size: var(--font-size-2xl); }
.docs-panel h3 { font-size: var(--font-size-xl); }
.docs-panel h4 { font-size: var(--font-size-lg); }

.docs-panel p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

.docs-panel ul,
.docs-panel ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.docs-panel li {
  margin-bottom: var(--spacing-xs);
}

.docs-panel code {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.docs-panel pre {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

.docs-panel pre code {
  background: none;
  padding: 0;
}

.docs-panel blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.docs-actions {
  display: flex;
  justify-content: flex-end;
}

/* Tests */
.tests-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
}

.tests-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.tests-summary {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.tests-details {
  background-color: var(--color-surface-hover);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.test-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
}

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

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

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

.test-name {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
}

.test-status {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Footer */
.footer {
  background-color: var(--color-surface-hover);
  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-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

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

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

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

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: none;
}

.modal.open {
  display: block;
}

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

.modal-content {
  position: relative;
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 800px;
  max-height: 90vh;
  margin: 5vh auto;
  z-index: var(--z-modal);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

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

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

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

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.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(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination button:hover:not(:disabled),
.pagination button:focus:not(:disabled) {
  background-color: var(--color-surface-hover);
  border-color: var(--color-primary);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-menu {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .dinosaurs-grid {
    grid-template-columns: 1fr;
  }
  
  .filters-grid {
    grid-template-columns: 1fr;
  }
  
  .calc-tabs,
  .docs-tabs {
    flex-wrap: wrap;
  }
  
  .compare-charts {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    margin: 0;
    max-height: 100vh;
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .calc-inputs {
    grid-template-columns: 1fr;
  }
}

/* Print styles */
@media print {
  .header,
  .footer,
  .nav-controls,
  .btn,
  .modal {
    display: none !important;
  }
  
  .section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  
  .card {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}