/**
 * CSS Variables - Colors and Typography
 * Household Management App
 */

:root {
  /* ============================================
     COLOR PALETTE
     ============================================ */
  
  /* Primary Colors - Soft Blue */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  --color-primary-lighter: #93c5fd;
  --color-primary-lightest: #dbeafe;
  
  /* Secondary Colors - Warm Light Gray */
  --color-secondary: #f4f6f8;
  --color-secondary-dark: #e5e7eb;
  --color-secondary-light: #f9fafb;
  --color-secondary-lighter: #ffffff;
  --color-secondary-lightest: #ffffff;
  
  /* Accent Colors - Fresh Mint */
  --color-accent: #2dd4bf;
  --color-accent-dark: #14b8a6;
  --color-accent-light: #5eead4;
  --color-accent-lighter: #99f6e4;
  --color-accent-lightest: #ccfbf1;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-black: #000000;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-success-dark: #059669;
  
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-warning-dark: #d97706;
  
  --color-error: #ef4444;
  --color-error-light: #fee2e2;
  --color-error-dark: #dc2626;
  
  --color-info: #3b82f6;
  --color-info-light: #dbeafe;
  --color-info-dark: #2563eb;
  
  /* Background Colors */
  --bg-primary: var(--color-white);
  --bg-secondary: var(--color-gray-50);
  --bg-tertiary: var(--color-gray-100);
  --bg-dark: var(--color-gray-800);
  --bg-darker: var(--color-gray-900);
  
  /* Text Colors - Dark Slate */
  --text-primary: #1f2937;
  --text-secondary: var(--color-gray-600);
  --text-tertiary: var(--color-gray-500);
  --text-inverse: var(--color-white);
  --text-link: var(--color-primary);
  --text-link-hover: var(--color-primary-dark);
  
  /* Border Colors */
  --border-color: var(--color-gray-200);
  --border-color-light: var(--color-gray-100);
  --border-color-dark: var(--color-gray-300);
  --border-color-focus: var(--color-primary);
  
  /* Shadow Colors */
  --shadow-sm: rgba(0, 0, 0, 0.05);
  --shadow-md: rgba(0, 0, 0, 0.1);
  --shadow-lg: rgba(0, 0, 0, 0.15);
  --shadow-xl: rgba(0, 0, 0, 0.2);
  
  /* ============================================
     TYPOGRAPHY
     ============================================ */
  
  /* Font Families */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-secondary: 'Georgia', 'Times New Roman', serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Fira Mono', 'Droid Sans Mono', 'Source Code Pro', monospace;
  
  /* Font Sizes - Mobile First */
  --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 */
  --font-size-5xl: 3rem;        /* 48px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tighter: -0.05em;
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* ============================================
     SPACING
     ============================================ */
  
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;     /* 8px */
  --spacing-3: 0.75rem;    /* 12px */
  --spacing-4: 1rem;       /* 16px */
  --spacing-5: 1.25rem;    /* 20px */
  --spacing-6: 1.5rem;     /* 24px */
  --spacing-8: 2rem;       /* 32px */
  --spacing-10: 2.5rem;    /* 40px */
  --spacing-12: 3rem;      /* 48px */
  --spacing-16: 4rem;      /* 64px */
  --spacing-20: 5rem;      /* 80px */
  --spacing-24: 6rem;      /* 96px */
  
  /* ============================================
     BORDERS & RADIUS
     ============================================ */
  
  --border-width: 1px;
  --border-width-thick: 2px;
  --border-width-thicker: 4px;
  
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem;    /* 8px */
  --border-radius-xl: 0.75rem;   /* 12px */
  --border-radius-2xl: 1rem;     /* 16px */
  --border-radius-full: 9999px;
  
  /* ============================================
     SHADOWS
     ============================================ */
  
  --shadow-sm: 0 1px 2px 0 var(--shadow-sm);
  --shadow-md: 0 4px 6px -1px var(--shadow-md), 0 2px 4px -1px var(--shadow-sm);
  --shadow-lg: 0 10px 15px -3px var(--shadow-lg), 0 4px 6px -2px var(--shadow-sm);
  --shadow-xl: 0 20px 25px -5px var(--shadow-xl), 0 10px 10px -5px var(--shadow-sm);
  --shadow-2xl: 0 25px 50px -12px var(--shadow-xl);
  --shadow-inner: inset 0 2px 4px 0 var(--shadow-sm);
  --shadow-none: none;
  
  /* ============================================
     TRANSITIONS
     ============================================ */
  
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  --transition-slower: 500ms ease-in-out;
  
  /* ============================================
     Z-INDEX LAYERS
     ============================================ */
  
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* ============================================
     BREAKPOINTS (for JavaScript use)
     ============================================ */
  
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ============================================
   DARK MODE (Future Enhancement)
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root {
    /* Override colors for dark mode */
    --bg-primary: var(--color-gray-900);
    --bg-secondary: var(--color-gray-800);
    --bg-tertiary: var(--color-gray-700);
    
    --text-primary: var(--color-gray-100);
    --text-secondary: var(--color-gray-300);
    --text-tertiary: var(--color-gray-400);
    
    --border-color: var(--color-gray-700);
    --border-color-light: var(--color-gray-800);
    --border-color-dark: var(--color-gray-600);
  }
}