/* === DESIGN TOKENS === */
/* Single source of truth for all visual values in EduCore */
/* Every other CSS file references these variables */

:root {
    /* --- Colors --- */
    --color-primary: #1e3a8a;
    --color-primary-hover: #1e40af;
    --color-primary-light: #eff6ff;
    --color-secondary: #f59e0b;
    --color-secondary-hover: #d97706;
    --color-success: #10b981;
    --color-success-light: #ecfdf5;
    --color-danger: #ef4444;
    --color-danger-light: #fef2f2;
    --color-warning: #f59e0b;
    --color-warning-light: #fffbeb;
    --color-info: #3b82f6;
    --color-info-light: #eff6ff;

    /* --- Neutrals --- */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* --- Semantic Aliases --- */
    --color-text-primary: var(--color-gray-800);
    --color-text-secondary: var(--color-gray-500);
    --color-text-muted: var(--color-gray-400);
    --color-text-inverse: #ffffff;
    --color-border: var(--color-gray-200);
    --color-border-focus: var(--color-primary);
    --color-bg-page: var(--color-gray-50);
    --color-bg-card: #ffffff;
    --color-bg-sidebar: var(--color-gray-800);
    --color-bg-sidebar-hover: var(--color-gray-700);
    --color-bg-sidebar-active: var(--color-primary);

    /* --- Typography --- */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-brand: 'Inter', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 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;
    --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 --- */
    --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;

    /* --- Border Radius --- */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* --- Elevation --- */
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.08), 0 10px 10px rgba(0,0,0,0.04);

    /* --- Transitions --- */
    --transition-fast: all 0.15s ease;
    --transition-base: all 0.2s ease;
    --transition-slow: all 0.3s ease;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* --- Layout --- */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 64px;
    --header-height: 60px;
    --mobile-bottom-nav-height: 56px;
    --content-max-width: 1400px;
}