:root {
  /* Colors */
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: #e0e7ff;

  --color-secondary: #64748b;
  --color-secondary-hover: #475569;

  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;

  --color-success: #22c55e;
  --color-warning: #f59e0b;

  --color-bg: #f8fafc;
  --color-bg-muted: #e2e8f0;
  --color-surface: #f1f5f9;
  --color-border: #cbd5e1;

  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Font */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
}

/* Dark/Night Mode */
[data-theme="dark"] {
  --color-primary: #818cf8;
  --color-primary-hover: #6366f1;
  --color-primary-light: #312e81;

  --color-secondary: #94a3b8;
  --color-secondary-hover: #64748b;

  --color-danger: #f87171;
  --color-danger-hover: #ef4444;

  --color-success: #4ade80;
  --color-warning: #fbbf24;

  --color-bg: #0f172a;
  --color-bg-muted: #1e293b;
  --color-surface: #1e293b;
  --color-border: #334155;

  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
}