/**
 * ECO DESIGN SYSTEM - VARIABLES
 * Modern, accessible design system based on homepage success
 * Designed for WCAG 2.1 AA/AAA compliance
 */

:root {
    /* ============================================
       PRIMARY COLOR PALETTE (Green - Main Brand)
       ============================================ */
    --eco-green-50: #ECFDF5;
    --eco-green-100: #D1FAE5;
    --eco-green-200: #A7F3D0;
    --eco-green-300: #6EE7B7;
    --eco-green-400: #34D399;
    --eco-green-500: #10B981;  /* Primary Green */
    --eco-green-600: #059669;  /* Darker Green */
    --eco-green-700: #047857;  /* Dark Green for CTAs */
    --eco-green-800: #065F46;
    --eco-green-900: #064E3B;

    /* ============================================
       SECONDARY COLOR PALETTES
       ============================================ */

    /* Amber/Yellow (Challenges, Warnings) */
    --eco-amber-50: #FFFBEB;
    --eco-amber-100: #FEF3C7;
    --eco-amber-200: #FDE68A;
    --eco-amber-300: #FCD34D;
    --eco-amber-400: #FBBF24;
    --eco-amber-500: #F59E0B;
    --eco-amber-600: #D97706;
    --eco-amber-700: #B45309;
    --eco-amber-800: #92400E;
    --eco-amber-900: #78350F;

    /* Blue (Info, Educational) */
    --eco-blue-50: #EFF6FF;
    --eco-blue-100: #DBEAFE;
    --eco-blue-200: #BFDBFE;
    --eco-blue-300: #93C5FD;
    --eco-blue-400: #60A5FA;
    --eco-blue-500: #3B82F6;
    --eco-blue-600: #2563EB;
    --eco-blue-700: #1D4ED8;
    --eco-blue-800: #1E40AF;
    --eco-blue-900: #1E3A8A;

    /* Teal (Alternative green for variety) */
    --eco-teal-50: #F0FDFA;
    --eco-teal-100: #CCFBF1;
    --eco-teal-200: #99F6E4;
    --eco-teal-300: #5EEAD4;
    --eco-teal-400: #2DD4BF;
    --eco-teal-500: #14B8A6;
    --eco-teal-600: #0D9488;
    --eco-teal-700: #0F766E;
    --eco-teal-800: #115E59;
    --eco-teal-900: #134E4A;

    /* ============================================
       NEUTRAL COLORS (Text, Backgrounds)
       ============================================ */
    --eco-gray-50: #F9FAFB;
    --eco-gray-100: #F3F4F6;
    --eco-gray-200: #E5E7EB;
    --eco-gray-300: #D1D5DB;
    --eco-gray-400: #9CA3AF;
    --eco-gray-500: #6B7280;
    --eco-gray-600: #4B5563;
    --eco-gray-700: #374151;
    --eco-gray-800: #1F2937;
    --eco-gray-900: #111827;

    /* ============================================
       SEMANTIC COLORS
       ============================================ */
    --eco-success: var(--eco-green-600);
    --eco-warning: var(--eco-amber-500);
    --eco-error: #DC2626;
    --eco-info: var(--eco-blue-500);

    /* ============================================
       GRADIENTS (2-tone for depth)
       ============================================ */
    --eco-gradient-green: linear-gradient(135deg, var(--eco-green-50) 0%, var(--eco-green-100) 100%);
    --eco-gradient-green-vibrant: linear-gradient(135deg, var(--eco-green-500) 0%, var(--eco-green-600) 100%);
    --eco-gradient-amber: linear-gradient(135deg, var(--eco-amber-100) 0%, var(--eco-amber-200) 100%);
    --eco-gradient-amber-vibrant: linear-gradient(135deg, var(--eco-amber-500) 0%, var(--eco-amber-600) 100%);
    --eco-gradient-blue: linear-gradient(135deg, var(--eco-blue-100) 0%, var(--eco-blue-200) 100%);
    --eco-gradient-blue-vibrant: linear-gradient(135deg, var(--eco-blue-500) 0%, var(--eco-blue-600) 100%);
    --eco-gradient-bg: linear-gradient(135deg, var(--eco-green-50) 0%, #E0F2FE 100%);

    /* ============================================
       TYPOGRAPHY
       ============================================ */
    --eco-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --eco-font-family-heading: 'Poppins', 'Inter', sans-serif;

    /* Font Sizes (Fluid Typography) */
    --eco-text-xs: 0.75rem;     /* 12px */
    --eco-text-sm: 0.875rem;    /* 14px */
    --eco-text-base: 1rem;      /* 16px */
    --eco-text-lg: 1.125rem;    /* 18px */
    --eco-text-xl: 1.25rem;     /* 20px */
    --eco-text-2xl: 1.5rem;     /* 24px */
    --eco-text-3xl: 1.875rem;   /* 30px */
    --eco-text-4xl: 2.25rem;    /* 36px */
    --eco-text-5xl: 3rem;       /* 48px */

    /* Font Weights */
    --eco-font-normal: 400;
    --eco-font-medium: 500;
    --eco-font-semibold: 600;
    --eco-font-bold: 700;
    --eco-font-extrabold: 800;

    /* Line Heights */
    --eco-leading-tight: 1.25;
    --eco-leading-snug: 1.375;
    --eco-leading-normal: 1.5;
    --eco-leading-relaxed: 1.625;
    --eco-leading-loose: 2;

    /* ============================================
       SPACING SYSTEM (Consistent scale)
       ============================================ */
    --eco-space-0: 0;
    --eco-space-1: 0.25rem;   /* 4px */
    --eco-space-2: 0.5rem;    /* 8px */
    --eco-space-3: 0.75rem;   /* 12px */
    --eco-space-4: 1rem;      /* 16px */
    --eco-space-5: 1.25rem;   /* 20px */
    --eco-space-6: 1.5rem;    /* 24px */
    --eco-space-8: 2rem;      /* 32px */
    --eco-space-10: 2.5rem;   /* 40px */
    --eco-space-12: 3rem;     /* 48px */
    --eco-space-16: 4rem;     /* 64px */
    --eco-space-20: 5rem;     /* 80px */

    /* ============================================
       BORDER RADIUS
       ============================================ */
    --eco-radius-sm: 4px;
    --eco-radius-md: 8px;
    --eco-radius-lg: 12px;
    --eco-radius-xl: 16px;
    --eco-radius-2xl: 24px;
    --eco-radius-full: 9999px;

    /* ============================================
       SHADOWS (Depth system)
       ============================================ */
    --eco-shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --eco-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --eco-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --eco-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --eco-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --eco-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Component-specific shadows */
    --eco-shadow-green: 0 4px 12px rgba(16, 185, 129, 0.2);
    --eco-shadow-amber: 0 4px 12px rgba(245, 158, 11, 0.2);
    --eco-shadow-blue: 0 4px 12px rgba(59, 130, 246, 0.2);

    /* ============================================
       Z-INDEX LAYERS
       ============================================ */
    --eco-z-base: 0;
    --eco-z-dropdown: 1000;
    --eco-z-sticky: 1020;
    --eco-z-fixed: 1030;
    --eco-z-modal-backdrop: 1040;
    --eco-z-modal: 1050;
    --eco-z-popover: 1060;
    --eco-z-tooltip: 1070;

    /* ============================================
       TRANSITIONS
       ============================================ */
    --eco-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --eco-transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --eco-transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* ============================================
       BREAKPOINTS (for reference in JS)
       ============================================ */
    --eco-screen-sm: 640px;
    --eco-screen-md: 768px;
    --eco-screen-lg: 1024px;
    --eco-screen-xl: 1280px;
    --eco-screen-2xl: 1536px;
}

/* ============================================
   ACCESSIBILITY - FOCUS RINGS
   ============================================ */
:focus-visible {
    outline: 3px solid var(--eco-green-500);
    outline-offset: 2px;
}

/* ============================================
   UTILITY CLASSES FOR QUICK USE
   ============================================ */
.eco-bg-gradient-green { background: var(--eco-gradient-green); }
.eco-bg-gradient-amber { background: var(--eco-gradient-amber); }
.eco-bg-gradient-blue { background: var(--eco-gradient-blue); }

.eco-text-green { color: var(--eco-green-700); }
.eco-text-amber { color: var(--eco-amber-800); }
.eco-text-blue { color: var(--eco-blue-800); }

.eco-shadow-green { box-shadow: var(--eco-shadow-green); }
.eco-shadow-amber { box-shadow: var(--eco-shadow-amber); }
.eco-shadow-blue { box-shadow: var(--eco-shadow-blue); }