/* 
 * StudentFocus Design System
 * Variables & Tokens
 * 
 * Professional CSS design system for StudentFocus application
 * Supports both Student Mode and Executive Mode
 */

:root {
    /* ============================================
       COLOR PALETTE
       ============================================ */
    
    /* Primary Brand Colors */
    --sf-primary-50: #f5f3ff;
    --sf-primary-100: #ede9fe;
    --sf-primary-200: #ddd6fe;
    --sf-primary-300: #c4b5fd;
    --sf-primary-400: #a78bfa;
    --sf-primary-500: #8b5cf6;
    --sf-primary-600: #7c3aed;
    --sf-primary-700: #6d28d9;
    --sf-primary-800: #5b21b6;
    --sf-primary-900: #4c1d95;
    
    /* Secondary Colors */
    --sf-secondary-50: #fdf4ff;
    --sf-secondary-100: #fae8ff;
    --sf-secondary-200: #f5d0fe;
    --sf-secondary-300: #f0abfc;
    --sf-secondary-400: #e879f9;
    --sf-secondary-500: #d946ef;
    --sf-secondary-600: #c026d3;
    --sf-secondary-700: #a21caf;
    --sf-secondary-800: #86198f;
    --sf-secondary-900: #701a75;
    
    /* Neutral Colors (Slate) */
    --sf-neutral-50: #f8fafc;
    --sf-neutral-100: #f1f5f9;
    --sf-neutral-200: #e2e8f0;
    --sf-neutral-300: #cbd5e1;
    --sf-neutral-400: #94a3b8;
    --sf-neutral-500: #64748b;
    --sf-neutral-600: #475569;
    --sf-neutral-700: #334155;
    --sf-neutral-800: #1e293b;
    --sf-neutral-900: #0f172a;
    
    /* Semantic Colors - Success */
    --sf-success-50: #f0fdf4;
    --sf-success-100: #dcfce7;
    --sf-success-200: #bbf7d0;
    --sf-success-300: #86efac;
    --sf-success-400: #4ade80;
    --sf-success-500: #22c55e;
    --sf-success-600: #16a34a;
    --sf-success-700: #15803d;
    --sf-success-800: #166534;
    --sf-success-900: #14532d;
    
    /* Semantic Colors - Warning */
    --sf-warning-50: #fffbeb;
    --sf-warning-100: #fef3c7;
    --sf-warning-200: #fde68a;
    --sf-warning-300: #fcd34d;
    --sf-warning-400: #fbbf24;
    --sf-warning-500: #f59e0b;
    --sf-warning-600: #d97706;
    --sf-warning-700: #b45309;
    --sf-warning-800: #92400e;
    --sf-warning-900: #78350f;
    
    /* Semantic Colors - Error */
    --sf-error-50: #fef2f2;
    --sf-error-100: #fee2e2;
    --sf-error-200: #fecaca;
    --sf-error-300: #fca5a5;
    --sf-error-400: #f87171;
    --sf-error-500: #ef4444;
    --sf-error-600: #dc2626;
    --sf-error-700: #b91c1c;
    --sf-error-800: #991b1b;
    --sf-error-900: #7f1d1d;
    
    /* Semantic Colors - Info */
    --sf-info-50: #eff6ff;
    --sf-info-100: #dbeafe;
    --sf-info-200: #bfdbfe;
    --sf-info-300: #93c5fd;
    --sf-info-400: #60a5fa;
    --sf-info-500: #3b82f6;
    --sf-info-600: #2563eb;
    --sf-info-700: #1d4ed8;
    --sf-info-800: #1e40af;
    --sf-info-900: #1e3a8a;
    
    /* Executive Mode - Health Status Colors */
    --sf-health-green: #22c55e;
    --sf-health-green-bg: #dcfce7;
    --sf-health-yellow: #f59e0b;
    --sf-health-yellow-bg: #fef3c7;
    --sf-health-red: #ef4444;
    --sf-health-red-bg: #fee2e2;
    
    /* ============================================
       TYPOGRAPHY
       ============================================ */
    
    /* Font Families */
    --sf-font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', 'Oxygen', 
                    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --sf-font-mono: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    
    /* Font Sizes */
    --sf-text-xs: 0.75rem;      /* 12px */
    --sf-text-sm: 0.875rem;     /* 14px */
    --sf-text-base: 1rem;       /* 16px */
    --sf-text-lg: 1.125rem;     /* 18px */
    --sf-text-xl: 1.25rem;      /* 20px */
    --sf-text-2xl: 1.5rem;      /* 24px */
    --sf-text-3xl: 1.875rem;    /* 30px */
    --sf-text-4xl: 2.25rem;     /* 36px */
    --sf-text-5xl: 3rem;        /* 48px */
    
    /* Font Weights */
    --sf-font-light: 300;
    --sf-font-normal: 400;
    --sf-font-medium: 500;
    --sf-font-semibold: 600;
    --sf-font-bold: 700;
    --sf-font-extrabold: 800;
    
    /* Line Heights */
    --sf-leading-none: 1;
    --sf-leading-tight: 1.25;
    --sf-leading-snug: 1.375;
    --sf-leading-normal: 1.5;
    --sf-leading-relaxed: 1.625;
    --sf-leading-loose: 2;
    
    /* Letter Spacing */
    --sf-tracking-tighter: -0.05em;
    --sf-tracking-tight: -0.025em;
    --sf-tracking-normal: 0em;
    --sf-tracking-wide: 0.025em;
    --sf-tracking-wider: 0.05em;
    --sf-tracking-widest: 0.1em;
    
    /* ============================================
       SPACING
       ============================================ */
    
    --sf-space-0: 0;
    --sf-space-1: 0.25rem;      /* 4px */
    --sf-space-2: 0.5rem;       /* 8px */
    --sf-space-3: 0.75rem;      /* 12px */
    --sf-space-4: 1rem;         /* 16px */
    --sf-space-5: 1.25rem;      /* 20px */
    --sf-space-6: 1.5rem;       /* 24px */
    --sf-space-8: 2rem;         /* 32px */
    --sf-space-10: 2.5rem;      /* 40px */
    --sf-space-12: 3rem;        /* 48px */
    --sf-space-16: 4rem;        /* 64px */
    --sf-space-20: 5rem;        /* 80px */
    --sf-space-24: 6rem;        /* 96px */
    
    /* ============================================
       SIZING
       ============================================ */
    
    --sf-width-xs: 20rem;       /* 320px */
    --sf-width-sm: 24rem;       /* 384px */
    --sf-width-md: 28rem;       /* 448px */
    --sf-width-lg: 32rem;       /* 512px */
    --sf-width-xl: 36rem;       /* 576px */
    --sf-width-2xl: 42rem;      /* 672px */
    --sf-width-3xl: 48rem;      /* 768px */
    --sf-width-4xl: 56rem;      /* 896px */
    --sf-width-5xl: 64rem;      /* 1024px */
    --sf-width-6xl: 72rem;      /* 1152px */
    --sf-width-7xl: 80rem;      /* 1280px */
    
    /* ============================================
       BORDER RADIUS
       ============================================ */
    
    --sf-radius-none: 0;
    --sf-radius-sm: 0.125rem;   /* 2px */
    --sf-radius-base: 0.25rem;  /* 4px */
    --sf-radius-md: 0.375rem;   /* 6px */
    --sf-radius-lg: 0.5rem;     /* 8px */
    --sf-radius-xl: 0.75rem;    /* 12px */
    --sf-radius-2xl: 1rem;      /* 16px */
    --sf-radius-3xl: 1.5rem;    /* 24px */
    --sf-radius-full: 9999px;
    
    /* ============================================
       SHADOWS
       ============================================ */
    
    --sf-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --sf-shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --sf-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --sf-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --sf-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --sf-shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --sf-shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    
    /* ============================================
       Z-INDEX LAYERS
       ============================================ */
    
    --sf-z-base: 0;
    --sf-z-dropdown: 1000;
    --sf-z-sticky: 1020;
    --sf-z-fixed: 1030;
    --sf-z-modal-backdrop: 1040;
    --sf-z-modal: 1050;
    --sf-z-popover: 1060;
    --sf-z-tooltip: 1070;
    --sf-z-toast: 1080;
    
    /* ============================================
       TRANSITIONS
       ============================================ */
    
    --sf-transition-fast: 150ms ease-in-out;
    --sf-transition-base: 250ms ease-in-out;
    --sf-transition-slow: 350ms ease-in-out;
    --sf-transition-slower: 500ms ease-in-out;
    
    /* Easing Functions */
    --sf-ease-in: cubic-bezier(0.4, 0, 1, 1);
    --sf-ease-out: cubic-bezier(0, 0, 0.2, 1);
    --sf-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* ============================================
       BREAKPOINTS (for reference in JavaScript)
       ============================================ */
    
    --sf-breakpoint-sm: 640px;
    --sf-breakpoint-md: 768px;
    --sf-breakpoint-lg: 1024px;
    --sf-breakpoint-xl: 1280px;
    --sf-breakpoint-2xl: 1536px;
}

/* ============================================
   DARK MODE OVERRIDES
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        /* Invert neutral colors for dark mode */
        --sf-neutral-50: #0f172a;
        --sf-neutral-100: #1e293b;
        --sf-neutral-200: #334155;
        --sf-neutral-300: #475569;
        --sf-neutral-400: #64748b;
        --sf-neutral-500: #94a3b8;
        --sf-neutral-600: #cbd5e1;
        --sf-neutral-700: #e2e8f0;
        --sf-neutral-800: #f1f5f9;
        --sf-neutral-900: #f8fafc;
    }
}

/* ============================================
   EXECUTIVE MODE OVERRIDES
   ============================================ */

[data-theme="executive"] {
    /* Executive mode uses more neutral, professional palette */
    --sf-primary-500: #475569;
    --sf-primary-600: #334155;
    --sf-primary-700: #1e293b;
    
    /* Reduce spacing for higher density */
    --sf-space-scale: 0.875; /* 87.5% of default spacing */
}