/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
  /* UI Colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-secondary: #64748b;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;

  /* Text colors */
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-text-muted: #9ca3af;

  /* Background colors */
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;

  /* Border colors */
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;

  /* Semantic Colors */
  --color-attention: #ffb41d;
  --color-attention-dark: #e59400;

  /* Success Background Colors (for ongoing/active items) */
  --color-success-bg: #e8f5e9;
  --color-success-bg-hover: #c8e6c9;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 1rem;

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

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

/* ============================================
   Dark Mode
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    /* Colors - adjust for better dark mode visibility */
    --color-primary: #60a5fa;
    --color-primary-dark: #3b82f6;
    --color-secondary: #94a3b8;
    --color-success: #34d399;
    --color-danger: #f87171;
    --color-warning: #fbbf24;

    /* Text colors */
    --color-text: #f9fafb;
    --color-text-light: #d1d5db;
    --color-text-muted: #9ca3af;

    /* Background colors */
    --color-bg: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;

    /* Border colors */
    --color-border: #374151;
    --color-border-dark: #4b5563;

    /* Success Background Colors (for ongoing/active items) */
    --color-success-bg: #1b3d1e;
    --color-success-bg-hover: #2e5c33;

    /* Shadows - softer for dark mode */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  }
}