/* ===== DESIGN SYSTEM ===== */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors */
  --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-50: #f0fdfa;
  --color-secondary-100: #ccfbf1;
  --color-secondary-200: #99f6e4;
  --color-secondary-300: #5eead4;
  --color-secondary-400: #2dd4bf;
  --color-secondary-500: #14b8a6;
  --color-secondary-600: #0d9488;
  --color-secondary-700: #0f766e;
  --color-secondary-800: #115e59;
  --color-secondary-900: #134e4a;

  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;

  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-200: #bbf7d0;
  --color-success-300: #86efac;
  --color-success-400: #4ade80;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;
  --color-success-800: #166534;
  --color-success-900: #14532d;

  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-200: #fde68a;
  --color-warning-300: #fcd34d;
  --color-warning-400: #fbbf24;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;
  --color-warning-800: #92400e;
  --color-warning-900: #78350f;

  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-200: #fecaca;
  --color-error-300: #fca5a5;
  --color-error-400: #f87171;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;
  --color-error-800: #991b1b;
  --color-error-900: #7f1d1d;

  /* Semantic Colors */
  --color-background: var(--color-neutral-50);
  --color-surface: #ffffff;
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-600);
  --color-text-tertiary: var(--color-neutral-500);
  --color-border: var(--color-neutral-200);
  --color-border-hover: var(--color-neutral-300);
  --color-focus: var(--color-primary-500);

  /* Typography */
  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "SF Mono", Monaco, Inconsolata, "Roboto Mono", 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-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 */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */

  /* Border Radius */
  --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-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* 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;

  /* Grid */
  --grid-columns: 12;
  --grid-gap: var(--space-6);
}

/* Dark Theme */
[data-theme="dark"] {
  --color-background: var(--color-neutral-900);
  --color-surface: var(--color-neutral-800);
  --color-text-primary: var(--color-neutral-50);
  --color-text-secondary: var(--color-neutral-300);
  --color-text-tertiary: var(--color-neutral-400);
  --color-border: var(--color-neutral-700);
  --color-border-hover: var(--color-neutral-600);
}

/* ===== 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-sans);
  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 {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

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

/* ===== ACCESSIBILITY ===== */
.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;
}

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

/* Skip to content */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary-600);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: var(--z-tooltip);
  border-radius: var(--radius-base);
}

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

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-8);
  }
}

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

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-6,
  .grid-cols-12 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-6,
  .grid-cols-12 {
    grid-template-columns: repeat(2, minmax(0, 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-end { justify-content: flex-end; }
.justify-start { justify-content: flex-start; }

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

/* App Layout */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 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(8px);
  background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .header {
  background-color: rgba(30, 30, 30, 0.9);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

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

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-6);
}

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

.nav-link:hover,
.nav-link:focus {
  color: var(--color-primary-600);
  background-color: var(--color-primary-50);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link:focus {
  background-color: rgba(59, 130, 246, 0.1);
}

.header-actions {
  display: flex;
  gap: var(--space-2);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

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

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

.hero-content {
  text-align: center;
  color: white;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-12) 0;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-tight);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-8);
  opacity: 0.9;
  line-height: var(--line-height-relaxed);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Main Content */
.main {
  flex: 1;
  padding: var(--space-16) 0;
}

/* Sections */
.section {
  margin-bottom: var(--space-20);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  background: none;
  white-space: nowrap;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

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

/* Button Variants */
.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 {
  background-color: transparent;
  color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary-600);
  color: white;
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-neutral-100);
  color: var(--color-text-primary);
}

[data-theme="dark"] .btn-ghost:hover:not(:disabled) {
  background-color: var(--color-neutral-800);
}

/* Button Sizes */
.btn-small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

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

/* Form Elements */
.input,
.select,
.textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-tertiary);
}

/* Search Box */
.search-box {
  position: relative;
  max-width: 400px;
  margin: 0 auto var(--space-8);
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.search-box .input {
  padding-left: var(--space-12);
}

/* Filters */
.explorer-controls {
  margin-bottom: var(--space-8);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.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-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-neutral-100);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip:hover {
  background-color: var(--color-neutral-200);
}

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

[data-theme="dark"] .chip {
  background-color: var(--color-neutral-800);
  border-color: var(--color-neutral-700);
}

[data-theme="dark"] .chip:hover {
  background-color: var(--color-neutral-700);
}

/* Sort Controls */
.sort-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: flex-end;
  margin-bottom: var(--space-8);
}

.sort-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.sort-controls .select {
  width: auto;
  min-width: 200px;
}

/* Dinosaur Grid */
.dinosaur-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-300);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

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

.card-content {
  margin-bottom: var(--space-4);
}

.card-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

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

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

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

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-neutral-100);
  border-radius: var(--radius-base);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tag.carnivore {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-error-700);
}

.tag.herbivore {
  background-color: rgba(34, 197, 94, 0.1);
  color: var(--color-success-700);
}

.tag.omnivore {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--color-warning-700);
}

[data-theme="dark"] .tag {
  background-color: var(--color-neutral-800);
}

/* Timeline */
.timeline-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.timeline-controls {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.timeline-viewport {
  width: 100%;
  height: 400px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-4);
}

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

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

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

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

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

/* Tabs */
.tab-nav {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
  overflow-x: auto;
}

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

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

.tab-btn.active {
  color: var(--color-primary-600);
  border-bottom-color: var(--color-primary-600);
}

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

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Calculations */
.calculation-explanation {
  max-width: 800px;
  margin: 0 auto;
}

.calculation-explanation h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

.calculation-explanation h4 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text-primary);
}

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

.formula-box {
  background-color: var(--color-neutral-50);
  border-left: 4px solid var(--color-primary-600);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
  border-radius: var(--radius-lg);
}

[data-theme="dark"] .formula-box {
  background-color: var(--color-neutral-900);
}

.formula {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-relaxed);
}

.calculation-example {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.example-steps {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.step {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.step:last-child {
  border-bottom: none;
}

.interactive-calculator,
.metabolism-comparison,
.speed-calculator {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.calculator-inputs {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.comparison-sliders {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.calculation-result {
  background-color: var(--color-neutral-50);
  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);
}

[data-theme="dark"] .calculation-result {
  background-color: var(--color-neutral-900);
}

/* Sliders */
.slider {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-neutral-200);
  outline: none;
  -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary-600);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary-600);
  cursor: pointer;
  border: none;
}

/* Radio Group */
.radio-group {
  display: flex;
  gap: var(--space-4);
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

/* Test Runner */
.test-runner {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.test-controls {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.test-results {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  max-height: 400px;
  overflow-y: auto;
}

/* Comparison */
.species-selector {
  margin-bottom: var(--space-8);
}

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

.comparison-results {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.comparison-table {
  overflow-x: auto;
  margin-bottom: var(--space-8);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.table th,
.table td {
  padding: var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  background-color: var(--color-neutral-50);
}

[data-theme="dark"] .table th {
  background-color: var(--color-neutral-900);
}

.comparison-charts {
  display: grid;
  gap: var(--space-6);
}

.chart-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.radar-chart {
  width: 100%;
  height: 400px;
}

/* Documentation */
.docs-content {
  max-width: 800px;
  margin: 0 auto;
}

.doc-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  line-height: var(--line-height-relaxed);
}

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

.doc-content h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

.doc-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

.doc-content h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

.doc-content h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

.doc-content p {
  margin-bottom: var(--space-4);
}

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

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

.doc-content code {
  background-color: var(--color-neutral-100);
  color: var(--color-error-600);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-base);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.doc-content pre {
  background-color: var(--color-neutral-100);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

.doc-content pre code {
  background: none;
  padding: 0;
  color: var(--color-text-primary);
}

.doc-content blockquote {
  border-left: 4px solid var(--color-primary-600);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
}

.doc-content th,
.doc-content td {
  padding: var(--space-2);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.doc-content th {
  font-weight: var(--font-weight-semibold);
  background-color: var(--color-neutral-50);
}

.doc-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

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

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.faq-question:hover {
  background-color: var(--color-neutral-50);
}

[data-theme="dark"] .faq-question:hover {
  background-color: var(--color-neutral-800);
}

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

.faq-question.active::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-4);
  display: none;
}

.faq-answer.active {
  display: block;
}

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

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

.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}

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

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

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

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

.footer-links a:hover {
  color: var(--color-primary-600);
}

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

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.modal {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 800px;
  max-height: 90vh;
  width: 90%;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

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

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

.modal-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  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(--space-2);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-neutral-100);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  max-height: calc(90vh - 100px);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  min-width: 300px;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform var(--transition-base);
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left: 4px solid var(--color-success-500);
}

.toast.error {
  border-left: 4px solid var(--color-error-500);
}

.toast.warning {
  border-left: 4px solid var(--color-warning-500);
}

.toast.info {
  border-left: 4px solid var(--color-primary-500);
}

/* Export Controls */
.export-controls {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-8);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-4);
  }

  .nav-list {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4);
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-lg);
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .filters {
    flex-direction: column;
  }

  .sort-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .sort-controls .select {
    width: 100%;
  }

  .dinosaur-grid {
    grid-template-columns: 1fr;
  }

  .timeline-viewport {
    height: 300px;
  }

  .tab-nav {
    overflow-x: auto;
  }

  .comparison-selector {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .btn-large {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
  }
}

/* Print Styles */
@media print {
  .header,
  .hero,
  .footer,
  .modal-overlay,
  .toast-container {
    display: none;
  }

  .main {
    padding: 0;
  }

  .section {
    margin-bottom: var(--space-8);
    page-break-inside: avoid;
  }

  .card {
    break-inside: avoid;
    border: 1px solid #ccc;
  }

  .dinosaur-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 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;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --color-text-primary: #000000;
    --color-text-secondary: #000000;
    --color-background: #ffffff;
    --color-surface: #ffffff;
  }

  [data-theme="dark"] {
    --color-border: #ffffff;
    --color-text-primary: #ffffff;
    --color-text-secondary: #ffffff;
    --color-background: #000000;
    --color-surface: #000000;
  }
}