/**
 * Injaaz Design System - Design Tokens
 * Central source of truth for all design values
 * Version: 1.0.0
 */

:root {
  /* ============================================
   * COLOR PALETTE
   * ============================================ */
  
  /* Primary Colors - Green Theme */
  --color-primary-50: #ecfdf5;
  --color-primary-100: #d1fae5;
  --color-primary-200: #a7f3d0;
  --color-primary-300: #6ee7b7;
  --color-primary-400: #34d399;
  --color-primary-500: #10b981;
  --color-primary-600: #059669;
  --color-primary-700: #047857;
  --color-primary-800: #065f46;
  --color-primary-900: #064e3b;
  --color-primary-950: #022c22;
  
  /* Brand Colors */
  --color-brand: #125435;
  --color-brand-light: #1a7a4d;
  --color-brand-dark: #0d3d24;
  --color-brand-accent: #E8F5E9;
  
  /* Neutral Colors */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f4f4f5;
  --color-neutral-200: #e4e4e7;
  --color-neutral-300: #d4d4d8;
  --color-neutral-400: #a1a1aa;
  --color-neutral-500: #71717a;
  --color-neutral-600: #52525b;
  --color-neutral-700: #3f3f46;
  --color-neutral-800: #27272a;
  --color-neutral-900: #18181b;
  --color-neutral-950: #09090b;
  
  /* Semantic Colors */
  --color-success-50: #f0fdf4;
  --color-success-100: #dcfce7;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;
  
  --color-warning-50: #fffbeb;
  --color-warning-100: #fef3c7;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-warning-700: #b45309;
  
  --color-error-50: #fef2f2;
  --color-error-100: #fee2e2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;
  
  --color-info-50: #eff6ff;
  --color-info-100: #dbeafe;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;
  --color-info-700: #1d4ed8;
  
  /* ============================================
   * TYPOGRAPHY
   * ============================================ */
  
  /* Font families — iOS/macOS: San Francisco via -apple-system; others fall through system-ui / platform UI */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  /* Footer “built by” name — Caveat (loaded in base_head / about) */
  --font-footer-author: "Caveat", "Segoe Script", "Apple Chancery", cursive;
  /* Author name colour — brand green on light UI; mint on dark footers */
  --text-footer-author: var(--color-brand);
  --text-footer-author-on-dark: var(--color-primary-300);
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  
  /* Font Sizes - Modular Scale (1.25 ratio) */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Letter Spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  
  /* ============================================
   * SPACING
   * ============================================ */
  
  /* Base unit: 4px */
  --space-0: 0;
  --space-px: 1px;
  --space-0-5: 0.125rem;   /* 2px */
  --space-1: 0.25rem;      /* 4px */
  --space-1-5: 0.375rem;   /* 6px */
  --space-2: 0.5rem;       /* 8px */
  --space-2-5: 0.625rem;   /* 10px */
  --space-3: 0.75rem;      /* 12px */
  --space-3-5: 0.875rem;   /* 14px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-7: 1.75rem;      /* 28px */
  --space-8: 2rem;         /* 32px */
  --space-9: 2.25rem;      /* 36px */
  --space-10: 2.5rem;      /* 40px */
  --space-11: 2.75rem;     /* 44px */
  --space-12: 3rem;        /* 48px */
  --space-14: 3.5rem;      /* 56px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-28: 7rem;        /* 112px */
  --space-32: 8rem;        /* 128px */
  
  /* ============================================
   * BORDERS & RADIUS
   * ============================================ */
  
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-default: 0.25rem; /* 4px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  --border-width-8: 8px;
  
  /* ============================================
   * SHADOWS
   * ============================================ */
  
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  --shadow-none: 0 0 #0000;
  
  /* Colored Shadows */
  --shadow-primary: 0 4px 14px 0 rgb(18 84 53 / 0.25);
  --shadow-success: 0 4px 14px 0 rgb(34 197 94 / 0.25);
  --shadow-error: 0 4px 14px 0 rgb(239 68 68 / 0.25);
  
  /* ============================================
   * TRANSITIONS & ANIMATIONS
   * ============================================ */
  
  /* Durations */
  --duration-75: 75ms;
  --duration-100: 100ms;
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  --duration-500: 500ms;
  --duration-700: 700ms;
  --duration-1000: 1000ms;
  
  /* Timing Functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Common Transitions */
  --transition-none: none;
  --transition-all: all var(--duration-200) var(--ease-in-out);
  --transition-colors: color, background-color, border-color, text-decoration-color, fill, stroke var(--duration-200) var(--ease-in-out);
  --transition-opacity: opacity var(--duration-200) var(--ease-in-out);
  --transition-shadow: box-shadow var(--duration-200) var(--ease-in-out);
  --transition-transform: transform var(--duration-200) var(--ease-in-out);
  
  /* ============================================
   * Z-INDEX SCALE
   * ============================================ */
  
  --z-below: -1;
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;
  --z-max: 9999;
  
  /* ============================================
   * BREAKPOINTS (for reference)
   * ============================================ */
  
  /* 
   * --breakpoint-sm: 640px;
   * --breakpoint-md: 768px;
   * --breakpoint-lg: 1024px;
   * --breakpoint-xl: 1280px;
   * --breakpoint-2xl: 1536px;
   */
  
  /* ============================================
   * SEMANTIC TOKENS (Light Mode)
   * ============================================ */
  
  /* Backgrounds */
  --bg-body: var(--color-neutral-50);
  --bg-surface: var(--color-neutral-0);
  --bg-surface-elevated: var(--color-neutral-0);
  --bg-muted: var(--color-neutral-100);
  --bg-subtle: var(--color-neutral-50);
  --bg-inverse: var(--color-neutral-900);
  
  /* Text */
  --text-primary: var(--color-neutral-900);
  --text-secondary: var(--color-neutral-600);
  --text-muted: var(--color-neutral-500);
  --text-placeholder: var(--color-neutral-400);
  --text-inverse: var(--color-neutral-0);
  --text-brand: var(--color-brand);
  
  /* Borders */
  --border-default: var(--color-neutral-200);
  --border-muted: var(--color-neutral-100);
  --border-strong: var(--color-neutral-300);
  --border-focus: var(--color-brand);
  
  /* Interactive */
  --interactive-primary: var(--color-brand);
  --interactive-primary-hover: var(--color-brand-light);
  --interactive-primary-active: var(--color-brand-dark);
  --interactive-muted: var(--color-neutral-100);
  --interactive-muted-hover: var(--color-neutral-200);
}

/* ============================================
 * DARK MODE
 * ============================================ */

[data-theme="dark"],
.dark {
  /* Backgrounds */
  --bg-body: var(--color-neutral-950);
  --bg-surface: var(--color-neutral-900);
  --bg-surface-elevated: var(--color-neutral-800);
  --bg-muted: var(--color-neutral-800);
  --bg-subtle: var(--color-neutral-900);
  --bg-inverse: var(--color-neutral-0);
  
  /* Text */
  --text-primary: var(--color-neutral-50);
  --text-secondary: var(--color-neutral-300);
  --text-muted: var(--color-neutral-400);
  --text-placeholder: var(--color-neutral-500);
  --text-inverse: var(--color-neutral-900);
  
  /* Borders */
  --border-default: var(--color-neutral-700);
  --border-muted: var(--color-neutral-800);
  --border-strong: var(--color-neutral-600);
  
  /* Adjust shadows for dark mode */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px 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);
}

/* Auto dark mode based on system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-body: var(--color-neutral-950);
    --bg-surface: var(--color-neutral-900);
    --bg-surface-elevated: var(--color-neutral-800);
    --bg-muted: var(--color-neutral-800);
    --bg-subtle: var(--color-neutral-900);
    --bg-inverse: var(--color-neutral-0);
    
    --text-primary: var(--color-neutral-50);
    --text-secondary: var(--color-neutral-300);
    --text-muted: var(--color-neutral-400);
    --text-placeholder: var(--color-neutral-500);
    --text-inverse: var(--color-neutral-900);
    
    --border-default: var(--color-neutral-700);
    --border-muted: var(--color-neutral-800);
    --border-strong: var(--color-neutral-600);
  }
}

/* ============================================
 * BASE STYLES
 * ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  transition: background-color var(--duration-300) var(--ease-in-out),
              color var(--duration-300) var(--ease-in-out);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}