/* CSS Variables */

:root {
    /* Color Palette */
    --color-primary: #3498db;
    --color-primary-dark: #2980b9;
    --color-primary-light: #5dade2;

    --color-secondary: #95a5a6;
    --color-secondary-dark: #7f8c8d;

    --color-success: #27ae60;
    --color-success-light: #d4edda;

    --color-error: #e74c3c;
    --color-error-light: #f8d7da;

    --color-warning: #f39c12;
    --color-warning-light: #fff3cd;

    --color-info: #3498db;
    --color-info-light: #d1ecf1;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;

    /* Text Colors */
    --color-text-primary: #2c3e50;
    --color-text-secondary: #7f8c8d;
    --color-text-muted: #95a5a6;

    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #ecf0f1;

    /* Border Colors */
    --color-border: #dee2e6;
    --color-border-light: #e9ecef;
    --color-border-dark: #ced4da;

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: 'Georgia', 'Times New Roman', serif;

    --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-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing Scale */
    --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 */

    /* Border Radius */
    --radius-sm: 0.25rem;     /* 4px */
    --radius-md: 0.375rem;    /* 6px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-full: 9999px;

    /* 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), 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);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;

    /* Z-Index */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-tooltip: 1070;

    /* Container */
    --container-max-width: 1200px;
    --container-padding: var(--spacing-md);

    /* Form */
    --input-height: 2.75rem;      /* 44px */
    --input-padding-x: 0.75rem;   /* 12px */
    --input-padding-y: 0.5rem;    /* 8px */
    --input-border-width: 1px;

    /* Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}