/* =============================================
   DESIGN SYSTEM: CSS VARIABLES
   ============================================= */

:root {
  /* COLOR PALETTE */
  /* Primary: Professional Blue (Government-adjacent) */
  --color-primary: #0051ba;
  --color-primary-dark: #003d8a;
  --color-primary-light: #e8f0fe;

  /* Neutrals: Trust & Clarity */
  --color-neutral-black: #1a1a1a;
  --color-neutral-dark-gray: #424242;
  --color-neutral-gray: #666666;
  --color-neutral-light-gray: #999999;
  --color-neutral-bg-light: #f5f5f5;
  --color-neutral-bg-lighter: #fafafa;
  --color-neutral-border: #d0d0d0;
  --color-neutral-border-light: #e0e0e0;

  /* Status Colors */
  --color-success: #1a7d3d;
  --color-success-light: #e8f5e9;
  --color-warning: #b88600;
  --color-warning-light: #fffde7;
  --color-error: #c41c3b;
  --color-error-light: #ffebee;
  --color-info: #0051ba;
  --color-info-light: #e8f0fe;

  /* TYPOGRAPHY */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-family-mono: 'Monaco', 'Courier New', 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;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  /* SPACING */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  --spacing-5xl: 8rem;

  /* BORDER & RADIUS */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;

  --border-width-light: 1px;
  --border-width-medium: 2px;
  --border-width-heavy: 3px;

  /* SHADOWS (Institutional, Subtle) */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);
  --shadow-focus: 0 0 0 3px rgba(0, 81, 186, 0.1);

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

  /* LAYOUT */
  --container-width: 1200px;
  --container-width-sm: 640px;
  --container-width-md: 768px;
  --container-width-lg: 1024px;

  --header-height: 64px;
  --footer-height: auto;

  /* Z-INDEX SCALE */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-notification: 600;

  /* BREAKPOINTS (Mobile-first) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* =============================================
   REDUCED MOTION PREFERENCES
   ============================================= */

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
    --transition-normal: 0s;
    --transition-slow: 0s;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =============================================
   DARK MODE (OPTIONAL - FUTURE)
   ============================================= */

@media (prefers-color-scheme: dark) {
  :root {
    --color-neutral-black: #f5f5f5;
    --color-neutral-dark-gray: #e0e0e0;
    --color-neutral-bg-light: #2a2a2a;
    --color-neutral-bg-lighter: #1a1a1a;
    --color-neutral-border: #424242;
    --color-neutral-border-light: #333333;
  }
}