/**
 * PetVet Design System - CSS Variables & Foundations
 * Version: 1.0.0
 *
 * This file defines the global design tokens for the PetVet application.
 * It includes colors, typography, spacing, and other foundational styles.
 *
 * IMPORTANT: This is additive - does not override Tailwind utilities.
 */

/* ============================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
    /* ------------------------------------------
       Primary Color Palette (Blue - Medical/Clinical)
       Based on a calming, professional blue
       ------------------------------------------ */
    --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;

    /* ------------------------------------------
       Accent Color Palette (Indigo)
       ------------------------------------------ */
    --color-accent-50: #eef2ff;
    --color-accent-100: #e0e7ff;
    --color-accent-200: #c7d2fe;
    --color-accent-300: #a5b4fc;
    --color-accent-400: #818cf8;
    --color-accent-500: #6366f1;
    --color-accent-600: #4f46e5;
    --color-accent-700: #4338ca;
    --color-accent-800: #3730a3;
    --color-accent-900: #312e81;

    /* ------------------------------------------
       Neutral / Gray Palette
       Clean, medical-grade neutrals
       ------------------------------------------ */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* ------------------------------------------
       Status Colors (WCAG AA Compliant)
       ------------------------------------------ */
    /* Success - Green */
    --color-success-50: #ecfdf5;
    --color-success-100: #d1fae5;
    --color-success-200: #a7f3d0;
    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-success-700: #047857;

    /* Warning - Amber */
    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-200: #fde68a;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;

    /* Error / Danger - Red */
    --color-error-50: #fef2f2;
    --color-error-100: #fee2e2;
    --color-error-200: #fecaca;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;
    --color-error-700: #b91c1c;

    /* Info - Cyan */
    --color-info-50: #ecfeff;
    --color-info-100: #cffafe;
    --color-info-200: #a5f3fc;
    --color-info-500: #06b6d4;
    --color-info-600: #0891b2;
    --color-info-700: #0e7490;

    /* ------------------------------------------
       Typography Scale
       ------------------------------------------ */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Courier New', monospace;

    /* Font Sizes */
    --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 */

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* ------------------------------------------
       Spacing Scale (consistent with Tailwind)
       ------------------------------------------ */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --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 */

    /* ------------------------------------------
       Border Radius
       ------------------------------------------ */
    --radius-none: 0;
    --radius-sm: 0.125rem;    /* 2px */
    --radius-default: 0.25rem; /* 4px */
    --radius-md: 0.375rem;    /* 6px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-2xl: 1rem;       /* 16px */
    --radius-full: 9999px;

    /* ------------------------------------------
       Shadows
       ------------------------------------------ */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-default: 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);

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

    /* ------------------------------------------
       Z-Index Scale
       ------------------------------------------ */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* ============================================
   2. BASE TYPOGRAPHY
   ============================================ */

html {
    font-family: var(--font-family-sans);
    font-size: 16px;
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--color-gray-900);
    background-color: var(--color-gray-50);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

/* Paragraph */
p {
    margin-bottom: var(--space-4);
}

/* Links */
a {
    color: var(--color-primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-700);
    text-decoration: underline;
}

/* Small text */
small, .text-sm {
    font-size: var(--font-size-sm);
}

.text-xs {
    font-size: var(--font-size-xs);
}

/* Monospace */
code, pre, kbd {
    font-family: var(--font-family-mono);
}

/* ============================================
   3. FOCUS STATES (Accessibility)
   ============================================ */

:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Remove outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* ============================================
   4. SELECTION STYLES
   ============================================ */

::selection {
    background-color: var(--color-primary-100);
    color: var(--color-primary-900);
}

/* ============================================
   5. SCROLLBAR STYLING (WebKit)
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

/* ============================================
   6. UTILITY CLASSES (Design System)
   ============================================ */

/* Text Colors using CSS variables */
.ds-text-primary { color: var(--color-primary-600); }
.ds-text-success { color: var(--color-success-600); }
.ds-text-warning { color: var(--color-warning-600); }
.ds-text-error { color: var(--color-error-600); }
.ds-text-info { color: var(--color-info-600); }
.ds-text-muted { color: var(--color-gray-500); }

/* Background Colors using CSS variables */
.ds-bg-primary { background-color: var(--color-primary-600); }
.ds-bg-primary-light { background-color: var(--color-primary-50); }
.ds-bg-success { background-color: var(--color-success-600); }
.ds-bg-success-light { background-color: var(--color-success-50); }
.ds-bg-warning { background-color: var(--color-warning-600); }
.ds-bg-warning-light { background-color: var(--color-warning-50); }
.ds-bg-error { background-color: var(--color-error-600); }
.ds-bg-error-light { background-color: var(--color-error-50); }
.ds-bg-info { background-color: var(--color-info-600); }
.ds-bg-info-light { background-color: var(--color-info-50); }

/* ============================================
   7. PRINT STYLES
   ============================================ */

@media print {
    body {
        background: white;
        color: black;
        font-size: 10pt;
    }

    a {
        color: black;
        text-decoration: underline;
    }

    .no-print {
        display: none !important;
    }
}