/**
 * DMS Smart Monitor v1 - Design Tokens
 * 
 * CSS Custom Properties defining the visual language of the platform.
 * These tokens are the single source of truth for colors, typography, 
 * spacing, and other design attributes.
 * 
 * @phase W2-01 - Design System Base
 * @module DesignTokens
 */

:root {
    /* ============================================
       COLOUR PALETTE
       ============================================ */
    
    /* Primary Brand Colors - Blue family */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;
    --color-primary-950: #172554;
    
    /* Secondary Colors - Slate/Neutral family */
    --color-secondary-50: #f8fafc;
    --color-secondary-100: #f1f5f9;
    --color-secondary-200: #e2e8f0;
    --color-secondary-300: #cbd5e1;
    --color-secondary-400: #94a3b8;
    --color-secondary-500: #64748b;
    --color-secondary-600: #475569;
    --color-secondary-700: #334155;
    --color-secondary-800: #1e293b;
    --color-secondary-900: #0f172a;
    --color-secondary-950: #020617;
    
    /* Success Colors - Green family */
    --color-success-50: #f0fdf4;
    --color-success-100: #dcfce7;
    --color-success-200: #bbf7d0;
    --color-success-300: #86efac;
    --color-success-400: #4ade80;
    --color-success-500: #22c55e;
    --color-success-600: #16a34a;
    --color-success-700: #15803d;
    --color-success-800: #166534;
    --color-success-900: #14532d;
    
    /* Warning Colors - Amber family */
    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-200: #fde68a;
    --color-warning-300: #fcd34d;
    --color-warning-400: #fbbf24;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;
    --color-warning-800: #92400e;
    --color-warning-900: #78350f;
    
    /* Error/Danger Colors - Red family */
    --color-error-50: #fef2f2;
    --color-error-100: #fee2e2;
    --color-error-200: #fecaca;
    --color-error-300: #fca5a5;
    --color-error-400: #f87171;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;
    --color-error-700: #b91c1c;
    --color-error-800: #991b1b;
    --color-error-900: #7f1d1d;
    
    /* Info Colors - Cyan family */
    --color-info-50: #ecfeff;
    --color-info-100: #cffafe;
    --color-info-200: #a5f3fc;
    --color-info-300: #67e8f9;
    --color-info-400: #22d3ee;
    --color-info-500: #06b6d4;
    --color-info-600: #0891b2;
    --color-info-700: #0e7490;
    --color-info-800: #155e75;
    --color-info-900: #164e63;
    
    /* Semantic Color Aliases */
    --color-brand: var(--color-primary-600);
    --color-brand-dark: var(--color-primary-700);
    --color-brand-light: var(--color-primary-500);
    
    --color-text-primary: var(--color-secondary-900);
    --color-text-secondary: var(--color-secondary-600);
    --color-text-tertiary: var(--color-secondary-400);
    --color-text-inverse: #ffffff;
    --color-text-link: var(--color-primary-600);
    --color-text-link-hover: var(--color-primary-700);
    
    --color-background-primary: #ffffff;
    --color-background-secondary: var(--color-secondary-50);
    --color-background-tertiary: var(--color-secondary-100);
    --color-background-inverse: var(--color-secondary-900);
    
    --color-border-default: var(--color-secondary-200);
    --color-border-strong: var(--color-secondary-300);
    --color-border-subtle: var(--color-secondary-100);
    
    /* Status Colors */
    --color-status-success: var(--color-success-600);
    --color-status-success-bg: var(--color-success-50);
    --color-status-success-border: var(--color-success-200);
    
    --color-status-warning: var(--color-warning-600);
    --color-status-warning-bg: var(--color-warning-50);
    --color-status-warning-border: var(--color-warning-200);
    
    --color-status-error: var(--color-error-600);
    --color-status-error-bg: var(--color-error-50);
    --color-status-error-border: var(--color-error-200);
    
    --color-status-info: var(--color-info-600);
    --color-status-info-bg: var(--color-info-50);
    --color-status-info-border: var(--color-info-200);
    
    --color-status-pending: var(--color-warning-500);
    --color-status-active: var(--color-success-500);
    --color-status-inactive: var(--color-secondary-400);
    
    /* ============================================
       TYPOGRAPHY
       ============================================ */
    
    /* Font Families */
    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Font Sizes - Using modular scale (1.25 ratio) */
    --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-size-5xl: 3rem;        /* 48px */
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Letter Spacing */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    
    /* ============================================
       SPACING SCALE
       ============================================ */
    
    /* Base unit: 4px (0.25rem) */
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;   /* 2px */
    --space-1: 0.25rem;      /* 4px */
    --space-1-5: 0.375rem;   /* 6px */
    --space-2: 0.5rem;       /* 8px */
    --space-2-5: 0.625rem;   /* 10px */
    --space-3: 0.75rem;      /* 12px */
    --space-3-5: 0.875rem;   /* 14px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.25rem;      /* 20px */
    --space-6: 1.5rem;       /* 24px */
    --space-8: 2rem;         /* 32px */
    --space-10: 2.5rem;      /* 40px */
    --space-12: 3rem;        /* 48px */
    --space-16: 4rem;        /* 64px */
    --space-20: 5rem;        /* 80px */
    --space-24: 6rem;        /* 96px */
    --space-32: 8rem;        /* 128px */
    
    /* ============================================
       SIZING
       ============================================ */
    
    /* Container widths */
    --container-xs: 20rem;     /* 320px */
    --container-sm: 24rem;     /* 384px */
    --container-md: 28rem;     /* 448px */
    --container-lg: 32rem;     /* 512px */
    --container-xl: 36rem;     /* 576px */
    --container-2xl: 42rem;    /* 672px */
    --container-3xl: 48rem;    /* 768px */
    --container-4xl: 56rem;    /* 896px */
    --container-5xl: 64rem;    /* 1024px */
    --container-6xl: 72rem;    /* 1152px */
    --container-7xl: 80rem;    /* 1280px */
    --container-full: 100%;
    
    /* Content max-widths */
    --content-max-width: var(--container-7xl);
    --content-narrow: var(--container-4xl);
    
    /* ============================================
       BORDERS & RADIUS
       ============================================ */
    
    /* Border widths */
    --border-width-0: 0px;
    --border-width-1: 1px;
    --border-width-2: 2px;
    --border-width-4: 4px;
    --border-width-8: 8px;
    
    /* Border radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;    /* 2px */
    --radius-md: 0.25rem;     /* 4px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-2xl: 1rem;       /* 16px */
    --radius-3xl: 1.5rem;     /* 24px */
    --radius-full: 9999px;
    
    /* ============================================
       SHADOWS
       ============================================ */
    
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    
    /* Focus ring shadow */
    --shadow-focus: 0 0 0 3px var(--color-primary-200);
    --shadow-focus-error: 0 0 0 3px var(--color-error-200);
    
    /* ============================================
       TRANSITIONS & ANIMATION
       ============================================ */
    
    /* Durations */
    --duration-instant: 0ms;
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 350ms;
    --duration-slower: 500ms;
    
    /* Easings */
    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* ============================================
       Z-INDEX SCALE
       ============================================ */
    
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;
    
    /* ============================================
       COMPONENT-SPECIFIC TOKENS
       ============================================ */
    
    /* Form elements */
    --form-input-height: 2.5rem;      /* 40px */
    --form-input-height-lg: 3rem;     /* 48px */
    --form-input-height-sm: 2rem;     /* 32px */
    --form-input-padding-x: var(--space-3);
    --form-input-border-radius: var(--radius-lg);
    
    /* Buttons */
    --button-height: 2.5rem;
    --button-height-sm: 2rem;
    --button-height-lg: 3rem;
    --button-padding-x: var(--space-4);
    --button-padding-x-sm: var(--space-3);
    --button-padding-x-lg: var(--space-6);
    --button-border-radius: var(--radius-lg);
    
    /* Cards */
    --card-padding: var(--space-6);
    --card-border-radius: var(--radius-xl);
    --card-shadow: var(--shadow-sm);
    
    /* Navigation */
    --nav-height: 4rem;
    --nav-height-collapsed: 3.5rem;
    --sidebar-width: 16rem;
    --sidebar-width-collapsed: 4rem;
    
    /* Status badges */
    --badge-padding-x: var(--space-2);
    --badge-padding-y: var(--space-0-5);
    --badge-border-radius: var(--radius-full);
    --badge-font-size: var(--font-size-xs);
    
    /* ============================================
       BREAKPOINTS (for reference in JS)
       ============================================ */
    
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* Dark mode support - prepared for future implementation */
@media (prefers-color-scheme: dark) {
    :root {
        /* Dark mode tokens would be defined here */
        /* Currently unused - placeholder for W2-03 or later */
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-width-1: 2px;
        --shadow-focus: 0 0 0 4px var(--color-primary-300);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    :root {
        --duration-fast: 0ms;
        --duration-normal: 0ms;
        --duration-slow: 0ms;
        --duration-slower: 0ms;
    }
}