/**
 * CSS Variables - Design Tokens
 * Centralized design system for the ESRC Community Portal
 */

:root {
    /* Brand Colors */
    --color-primary: #307ca4;
    --color-primary-hover: #2a6a91;
    --color-primary-light: #4a9cc4;
    --color-primary-dark: #1e5a7a;

    /* Secondary Colors */
    --color-secondary: #3498db;
    --color-secondary-hover: #2980b9;

    /* Status Colors */
    --color-success: #28a745;
    --color-success-light: #d4edda;
    --color-success-dark: #155724;
    --color-danger: #dc3545;
    --color-danger-light: #f8d7da;
    --color-danger-dark: #721c24;
    --color-warning: #ffc107;
    --color-warning-light: #fff3cd;
    --color-warning-dark: #856404;
    --color-info: #17a2b8;
    --color-info-light: #d1ecf1;
    --color-info-dark: #0c5460;

    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f5f5f5;
    --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;
    --color-text: #333333;
    --color-text-muted: #6c757d;

    /* Typography */
    --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-heading: 'Segoe UI', -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --line-height-tight: 1.25;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --max-width: 1200px;
    --max-width-wide: 1400px;
    --max-width-narrow: 800px;

    /* Borders */
    --border-radius-sm: 4px;
    --border-radius: 6px;
    --border-radius-lg: 8px;
    --border-radius-xl: 12px;
    --border-radius-full: 9999px;
    --border-color: #ddd;
    --border-color-light: #e9ecef;

    /* Shadows - Modernized, softer */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.15);

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

    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;
}