:root {
  /* Primary Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;

  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #06b6d4;

  /* Background Colors */
  --color-bg-light: #f8fafc;
  --color-bg-dark: #1e293b;
  --color-bg-elevation-1: #ffffff;
  --color-bg-elevation-1-dark: #334155;
  --color-border: #e2e8f0;
  --color-border-dark: #475569;

  /* Text Colors */
  --color-text-primary: #0f172a;
  --color-text-secondary: #64748b;
  --color-text-disabled: #cbd5e1;
  --color-text-white: #ffffff;

  /* Special Colors */
  --color-bacteria: #10b981;
  --color-robot: #f59e0b;
  --color-path-bad: #ef4444;
  --color-path-good: #10b981;
  --color-gradient-start: #fbbf24;
  --color-gradient-end: #10b981;

  /* Typography */
  --font-primary: 'Vazirmatn', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  --font-display: 'Tanha', 'Georgia', serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;

  /* Border Radius */
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

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

  /* Z-Index */
  --z-dropdown: 1000;
  --z-sticky: 1100;
  --z-fixed: 1200;
  --z-modal-backdrop: 1300;
  --z-modal: 1400;
  --z-tooltip: 1500;
}

/* Dark Mode - Explicit Class */
body.dark-mode {
  --color-bg-light: #0f172a;
  --color-bg-elevation-1: #1e293b;
  --color-bg-elevation-1-dark: #0f172a;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-border: #475569;
  --color-border-dark: #334155;
}

/* Dark Mode - System Preference Fallback */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-light: #0f172a;
    --color-bg-elevation-1: #1e293b;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-border: #475569;
  }
}