:root {
  /* Colors */
  --color-primary: #4F46E5;
  --color-primary-light: #818CF8;
  --color-primary-dark: #3730A3;
  --color-primary-bg: #EEF2FF;
  --color-success: #10B981;
  --color-success-bg: #D1FAE5;
  --color-warning: #F59E0B;
  --color-warning-bg: #FEF3C7;
  --color-danger: #EF4444;
  --color-danger-bg: #FEE2E2;
  --color-info: #3B82F6;
  --color-info-bg: #DBEAFE;

  /* Backgrounds */
  --color-bg: #F3F4F6;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F9FAFB;
  --color-surface-active: #F3F4F6;

  /* Text */
  --color-text: #111827;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;
  --color-text-faint: #9CA3AF;

  /* Borders */
  --color-border: #E5E7EB;
  --color-border-focus: #4F46E5;

  /* Nav */
  --color-nav-bg: #1E1B4B;
  --color-nav-text: #C7D2FE;
  --color-nav-active: #FFFFFF;
  --color-nav-active-bg: rgba(255,255,255,0.12);
  --color-nav-hover-bg: rgba(255,255,255,0.07);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.10), 0 10px 10px -5px rgba(0,0,0,0.04);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* Nav width */
  --nav-width: 220px;
  --nav-width-mobile: 60px;
}

/* Dark mode */
[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-surface: #1E293B;
  --color-surface-hover: #243348;
  --color-surface-active: #293E55;

  --color-text: #F1F5F9;
  --color-text-secondary: #CBD5E1;
  --color-text-muted: #94A3B8;
  --color-text-faint: #64748B;

  --color-border: #334155;
  --color-border-focus: #818CF8;

  --color-primary-bg: rgba(79,70,229,0.15);
  --color-success-bg: rgba(16,185,129,0.15);
  --color-warning-bg: rgba(245,158,11,0.15);
  --color-danger-bg: rgba(239,68,68,0.15);
  --color-info-bg: rgba(59,130,246,0.15);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.3);
}