/* ============================================================================
   PEPDRAW DESIGN SYSTEM - VARIABLES
   Single source of truth for colors, typography, spacing, and effects
   ============================================================================ */

:root {
    /* ===== BRAND COLORS ===== */
    --primary-blue: #667eea;
    --primary-blue-dark: #5568d3;
    --secondary-purple: #764ba2;
    --accent-purple: #7c3aed;
    
    /* ===== SEMANTIC COLORS ===== */
    --success-green: #10b981;
    --warning-yellow: #f59e0b;
    --error-red: #ef4444;
    --info-blue: #3b82f6;
    
    /* ===== BACKGROUND COLORS ===== */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-code: #1e293b;
    
    /* ===== TEXT COLORS ===== */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    
    /* ===== BORDER COLORS ===== */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;
    
    /* ===== GRADIENTS ===== */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-primary-soft: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    --gradient-overlay: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.05) 100%);
    
    /* ===== SHADOWS ===== */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* ===== TYPOGRAPHY ===== */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', Consolas, Monaco, monospace;
    
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-md: 1.0625rem;    /* 17px */
    --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-size-6xl: 3.75rem;     /* 60px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    --line-height-tight: 1.2;
    --line-height-snug: 1.4;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;
    --line-height-loose: 2;
    
    /* ===== SPACING ===== */
    --spacing-xs: 0.25rem;    /* 4px */
    --spacing-sm: 0.5rem;     /* 8px */
    --spacing-md: 1rem;       /* 16px */
    --spacing-lg: 1.5rem;     /* 24px */
    --spacing-xl: 2rem;       /* 32px */
    --spacing-2xl: 3rem;      /* 48px */
    --spacing-3xl: 4rem;      /* 64px */
    --spacing-4xl: 6rem;      /* 96px */
    
    /* ===== BORDER RADIUS ===== */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.5rem;      /* 8px */
    --radius-lg: 0.75rem;     /* 12px */
    --radius-xl: 1rem;        /* 16px */
    --radius-2xl: 1.5rem;     /* 24px */
    --radius-full: 9999px;
    
    /* ===== TRANSITIONS ===== */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    --transition-slower: 0.4s ease;
    
    /* ===== Z-INDEX SCALE ===== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ===== BASE RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: var(--line-height-normal);
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== DARK MODE SUPPORT (Future) ===== */
/* Uncomment when ready for dark mode */
/* @media (prefers-color-scheme: dark) {
    :root {
        
         --bg-primary: #0f172a;
         --text-primary: #f1f5f9;
    } 
} */