/**
 * DESIGN SYSTEM - CSS VARIABLES
 * Modern, minimal color scheme and typography
 * Optimized for performance and accessibility
 */

:root {
    /* ==================== COLORS ==================== */

    /* Primary Brand Colors */
    --color-primary: #0066CC;
    --color-primary-light: #3385DB;
    --color-primary-dark: #004C99;
    --color-primary-hover: #0052A3;

    /* Secondary Colors */
    --color-secondary: #FF6B35;
    --color-secondary-light: #FF8F6B;
    --color-secondary-dark: #CC5529;

    /* Neutral Colors - Modern Grayscale */
    --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-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* Background Colors */
    --bg-body: var(--color-white);
    --bg-section-alt: var(--color-gray-50);
    --bg-card: var(--color-white);
    --bg-overlay: rgba(0, 0, 0, 0.5);

    /* Text Colors */
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-muted: var(--color-gray-500);
    --text-inverse: var(--color-white);

    /* Border Colors */
    --border-color: var(--color-gray-200);
    --border-color-dark: var(--color-gray-300);

    /* ==================== TYPOGRAPHY ==================== */

    /* Font Families */
    --font-primary: 'Barlow', 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Font Sizes */
    --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-size-6xl: 3.75rem;     /* 60px */

    /* 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-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;

    /* ==================== SPACING ==================== */

    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */
    --space-32: 8rem;     /* 128px */

    /* ==================== LAYOUT ==================== */

    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;

    /* Max Content Width */
    --max-width: var(--container-xl);
    --max-width-content: 65ch;

    /* ==================== BORDERS ==================== */

    --border-width: 1px;
    --border-width-thick: 2px;
    --border-radius-sm: 0.25rem;  /* 4px */
    --border-radius: 0.5rem;      /* 8px */
    --border-radius-lg: 0.75rem;  /* 12px */
    --border-radius-xl: 1rem;     /* 16px */
    --border-radius-full: 9999px;

    /* ==================== SHADOWS ==================== */

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* ==================== TRANSITIONS ==================== */

    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* ==================== Z-INDEX ==================== */

    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ==================== DARK MODE SUPPORT (Future Enhancement) ==================== */
@media (prefers-color-scheme: dark) {
    :root {
        /* Uncomment when implementing dark mode */
        /*
        --bg-body: var(--color-gray-900);
        --bg-section-alt: var(--color-gray-800);
        --bg-card: var(--color-gray-800);
        --text-primary: var(--color-gray-100);
        --text-secondary: var(--color-gray-300);
        --border-color: var(--color-gray-700);
        */
    }
}