/* ==========================================================================
   CSS Variables - Modern Design System
   T.T. Themelios Lithos Ltd
   ========================================================================== */

:root {
    /* Colors - Modern Palette */
    --color-primary: #1E3A5F;
    --color-secondary: #2C5282;
    --color-accent: #E67E22;
    --color-accent-light: #F39C12;
    --color-accent-dark: #D35400;
    
    /* Background Colors */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F7FAFC;
    --color-bg-tertiary: #EDF2F7;
    --color-bg-dark: #1A202C;
    --color-bg-overlay: rgba(30, 58, 95, 0.9);
    
    /* Text Colors */
    --color-text-primary: #1A202C;
    --color-text-secondary: #4A5568;
    --color-text-tertiary: #718096;
    --color-text-light: #FFFFFF;
    
    /* Status Colors */
    --color-success: #38A169;
    --color-warning: #D69E2E;
    --color-error: #E53E3E;
    --color-info: #3182CE;
    
    /* Project Status */
    --color-completed: #38A169;
    --color-sold: #805AD5;
    --color-ongoing: #3182CE;
    
    /* Typography */
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Font Weights */
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    
    /* Line Heights */
    --leading-tight: 1.2;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Spacing */
    --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;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
    
    /* 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(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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-Index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    
    /* Section */
    --section-padding: 5rem 0;
}

@media (max-width: 992px) {
    :root {
        --section-padding: 4rem 0;
        --container-padding: 1.25rem;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 3rem 0;
        --container-padding: 1rem;
    }
}