/**
 * NischenKit Design Tokens
 *
 * Single source of truth for all design tokens used across NischenKit sites.
 * All values are CSS custom properties on :root for easy site-level overrides.
 *
 * Naming conventions:
 * - Colors: --color-{semantic}-{shade}
 * - Spacing: --space-{size}
 * - Typography: --font-{property}-{variant}
 * - Shadows: --shadow-{size}
 * - Borders: --radius-{size}
 */

:root {
  /* ==========================================================================
     COLOR PALETTE
     ========================================================================== */

  /* Primary - Brand/accent color (blue-based default, override per site) */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  /* Secondary - Complementary accent (purple-based default) */
  --color-secondary-50: #faf5ff;
  --color-secondary-100: #f3e8ff;
  --color-secondary-200: #e9d5ff;
  --color-secondary-300: #d8b4fe;
  --color-secondary-400: #c084fc;
  --color-secondary-500: #a855f7;
  --color-secondary-600: #9333ea;
  --color-secondary-700: #7e22ce;
  --color-secondary-800: #6b21a8;
  --color-secondary-900: #581c87;

  /* Neutral - Gray scale for text, backgrounds, borders */
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;

  /* Success - Positive indicators, pros, good ratings (green) */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-200: #bbf7d0;
  --color-success-300: #86efac;
  --color-success-400: #4ade80;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;
  --color-success-800: #166534;
  --color-success-900: #14532d;

  /* Warning - Caution indicators, rating stars (amber/yellow) */
  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-200: #fde68a;
  --color-warning-300: #fcd34d;
  --color-warning-400: #fbbf24;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;
  --color-warning-800: #92400e;
  --color-warning-900: #78350f;

  /* Danger - Negative indicators, cons (red) */
  --color-danger-50: #fef2f2;
  --color-danger-100: #fee2e2;
  --color-danger-200: #fecaca;
  --color-danger-300: #fca5a5;
  --color-danger-400: #f87171;
  --color-danger-500: #ef4444;
  --color-danger-600: #dc2626;
  --color-danger-700: #b91c1c;
  --color-danger-800: #991b1b;
  --color-danger-900: #7f1d1d;

  /* Info - Informational highlights (blue) */
  --color-info-50: #ecfeff;
  --color-info-100: #cffafe;
  --color-info-200: #a5f3fc;
  --color-info-300: #67e8f9;
  --color-info-400: #22d3ee;
  --color-info-500: #06b6d4;
  --color-info-600: #0891b2;
  --color-info-700: #0e7490;
  --color-info-800: #155e75;
  --color-info-900: #164e63;

  /* Surface - Cards, containers, elevated elements */
  --color-surface-base: #ffffff;
  --color-surface-raised: #fafafa;
  --color-surface-overlay: rgba(0, 0, 0, 0.5);

  /* ==========================================================================
     SPACING SCALE
     Using rem units for accessibility (respects user font-size preferences)
     ========================================================================== */

  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */

  /* ==========================================================================
     TYPOGRAPHY
     System font stack for optimal performance (no external font loading)
     ========================================================================== */

  /* Font families */
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;

  /* Font sizes (rem units for accessibility) */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */

  /* Line heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Font weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* ==========================================================================
     SHADOWS / ELEVATION
     Using neutral color with opacity for consistency
     ========================================================================== */

  --shadow-sm: 0 1px 2px 0 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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* ==========================================================================
     BORDER RADIUS
     ========================================================================== */

  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-full: 9999px;  /* Fully rounded (pills, avatars) */

  /* ==========================================================================
     RESPONSIVE BREAKPOINTS (reference values)
     Note: CSS custom properties cannot be used directly in media queries.
     These are documented here for reference; use literal values in media queries.

     Mobile-first approach:
     - Base styles: mobile (< 640px)
     - sm: min-width: 640px
     - md: min-width: 768px
     - lg: min-width: 1024px
     - xl: min-width: 1280px
     ========================================================================== */

  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;

  /* ==========================================================================
     TRANSITIONS
     Common transition durations for interactive states
     ========================================================================== */

  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}