/* CSS Custom Properties (Variables) */
:root {
    /* Color Palette */
    --primary-color: #7BC6A4;          /* Soft Green */
    --primary-light: #BFE7D1;          /* Lighter Green */
    --primary-dark: #4B8B6A;           /* Darker Green */

    --accent-color: #F6E7CB;           /* Warm Sand */
    --accent-light: #FFF6E5;           /* Lighter Sand */
    --accent-dark: #E2C89A;            /* Darker Sand */

    --secondary-color: #B7B7A4;        /* Muted Olive */
    --secondary-light: #E3E3D3;        /* Lighter Olive */
    --secondary-dark: #8A8A6D;         /* Darker Olive */

    /* Neutral Colors */
    --white: #FFFFFF;
    --bg-primary: #FAFAF7;
    --bg-secondary: #E9F5EF;
    --bg-tertiary: #F6E7CB;

    --text-primary: #2D3142;
    --text-secondary: #6B7280;
    --text-light: #A0A3BD;
    --text-muted: #C7C9D9;

    --border-light: #E6E8F0;
    --border-medium: #C7C9D9;
    --border-dark: #A0A3BD;

    /* Calm Theme Colors */
    --calm-green: #E9F5EF;
    --calm-sand: #F6E7CB;
    --calm-gray: #FAFAF7;

    /* Typography */
    --font-primary: 'Inter', 'Segoe UI', 'Noto Sans', Arial, sans-serif;
    --font-devanagari: 'Noto Sans Devanagari', 'Inter', sans-serif;
    --font-heading: 'Inter', 'Segoe UI', Arial, sans-serif;

    /* Font Sizes */
    --fs-xs: 0.75rem;
    --fs-sm: 0.875rem;
    --fs-base: 1rem;
    --fs-lg: 1.125rem;
    --fs-xl: 1.25rem;
    --fs-2xl: 1.5rem;
    --fs-3xl: 1.875rem;
    --fs-4xl: 2.25rem;
    --fs-5xl: 3rem;
    --fs-6xl: 3.75rem;

    /* Font Weights */
    --fw-light: 300;
    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

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

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(123, 198, 164, 0.04);
    --shadow-md: 0 4px 12px 0 rgba(123, 198, 164, 0.08);
    --shadow-lg: 0 10px 24px 0 rgba(123, 198, 164, 0.10);
    --shadow-xl: 0 20px 40px 0 rgba(123, 198, 164, 0.12);
    --shadow-2xl: 0 25px 50px -12px rgba(123, 198, 164, 0.18);

    /* Calm Shadows */
    --shadow-calm: 0 4px 24px rgba(123, 198, 164, 0.10);
    --shadow-accent: 0 4px 24px rgba(246, 231, 203, 0.10);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
    --gradient-calm: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
    --gradient-soft: linear-gradient(135deg, #FAFAF7 0%, #E9F5EF 100%);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4,0,0.2,1);
    --transition-normal: 0.3s cubic-bezier(0.4,0,0.2,1);
    --transition-slow: 0.5s cubic-bezier(0.4,0,0.2,1);

    /* 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;
    --z-toast: 1080;

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

    /* Breakpoints */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
    --bp-2xl: 1536px;

    /* Animation 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;

    /* Animation 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);

    /* Calm Patterns */
    --pattern-soft: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%237BC6A4' fill-opacity='0.03'%3E%3Ccircle cx='20' cy='20' r='18'/%3E%3C/g%3E%3C/svg%3E");
}

/* Dark mode variables (for future implementation) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1A202C;
        --bg-secondary: #2D3748;
        --bg-tertiary: #4A5568;
        
        --text-primary: #F7FAFC;
        --text-secondary: #E2E8F0;
        --text-light: #CBD5E0;
        --text-muted: #A0AEC0;
        
        --border-light: #4A5568;
        --border-medium: #718096;
        --border-dark: #A0AEC0;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #E6751A;
        --secondary-color: #3A7BC8;
        --text-primary: #000000;
        --bg-primary: #FFFFFF;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    :root {
        --transition-fast: 0s;
        --transition-normal: 0s;
        --transition-slow: 0s;
        --duration-75: 0s;
        --duration-100: 0s;
        --duration-150: 0s;
        --duration-200: 0s;
        --duration-300: 0s;
        --duration-500: 0s;
        --duration-700: 0s;
        --duration-1000: 0s;
    }
}