/* ============================================
   DESIGN TOKENS - Professional Design System
   AIKanBan Application
   ============================================ */

:root {
    /* ========== COLOR PALETTE ========== */

    /* Primary Colors - 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;  /* Main primary */
    --color-primary-600: #2563eb;  /* Hover state */
    --color-primary-700: #1d4ed8;  /* Active state */
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;

    /* Neutral Colors - Professional Grays */
    --color-neutral-0: #ffffff;
    --color-neutral-50: #f9fafb;
    --color-neutral-100: #f3f4f6;
    --color-neutral-200: #e5e7eb;
    --color-neutral-300: #d1d5db;
    --color-neutral-400: #9ca3af;
    --color-neutral-500: #6b7280;
    --color-neutral-600: #4b5563;
    --color-neutral-700: #374151;
    --color-neutral-800: #1f2937;
    --color-neutral-900: #111827;

    /* Semantic Colors - Success */
    --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;  /* Main success */
    --color-success-700: #15803d;
    --color-success-800: #166534;
    --color-success-900: #14532d;

    /* Semantic Colors - Warning */
    --color-warning-50: #fefce8;
    --color-warning-100: #fef9c3;
    --color-warning-200: #fef08a;
    --color-warning-300: #fde047;
    --color-warning-400: #facc15;
    --color-warning-500: #eab308;
    --color-warning-600: #ca8a04;  /* Main warning */
    --color-warning-700: #a16207;
    --color-warning-800: #854d0e;
    --color-warning-900: #713f12;

    /* Semantic Colors - Danger */
    --color-danger-50: #fef2f2;
    --color-danger-100: #fee2e2;
    --color-danger-200: #fecaca;
    --color-danger-300: #fca5a5;
    --color-danger-400: #f87171;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;  /* Main danger */
    --color-danger-700: #b91c1c;
    --color-danger-800: #991b1b;
    --color-danger-900: #7f1d1d;

    /* Semantic Colors - Info */
    --color-info-50: #eff6ff;
    --color-info-100: #dbeafe;
    --color-info-200: #bfdbfe;
    --color-info-300: #93c5fd;
    --color-info-400: #60a5fa;
    --color-info-500: #3b82f6;  /* Main info */
    --color-info-600: #2563eb;
    --color-info-700: #1d4ed8;
    --color-info-800: #1e40af;
    --color-info-900: #1e3a8a;

    /* ========== TYPOGRAPHY ========== */

    /* Font Families */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px - Labels, captions */
    --text-sm: 0.875rem;     /* 14px - Secondary text */
    --text-base: 1rem;       /* 16px - Body text */
    --text-lg: 1.125rem;     /* 18px - Large body */
    --text-xl: 1.25rem;      /* 20px - H4 */
    --text-2xl: 1.5rem;      /* 24px - H3 */
    --text-3xl: 1.875rem;    /* 30px - H2 */
    --text-4xl: 2.25rem;     /* 36px - H1 */

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

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;

    /* Letter Spacing */
    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;

    /* ========== SPACING (8px Grid) ========== */

    --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 */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* ========== BORDER RADIUS ========== */

    --radius-none: 0;
    --radius-sm: 0.25rem;    /* 4px - Small elements */
    --radius-md: 0.375rem;   /* 6px - Buttons, inputs */
    --radius-lg: 0.5rem;     /* 8px - Cards */
    --radius-xl: 0.75rem;    /* 12px - Large containers */
    --radius-2xl: 1rem;      /* 16px - Extra large */
    --radius-full: 9999px;   /* Pills, avatars */

    /* ========== SHADOWS ========== */

    /* Professional subtle shadows only - NO colored shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Focus Ring - Accessibility */
    --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.5);
    --shadow-focus-danger: 0 0 0 3px rgba(220, 38, 38, 0.5);

    /* ========== TRANSITIONS ========== */

    /* Easing Functions */
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);

    /* Duration */
    --transition-fast: 150ms;
    --transition-base: 200ms;
    --transition-slow: 300ms;

    /* Common Transitions */
    --transition-colors: color var(--transition-fast) var(--ease-in-out),
                         background-color var(--transition-fast) var(--ease-in-out),
                         border-color var(--transition-fast) var(--ease-in-out);
    --transition-shadow: box-shadow var(--transition-fast) var(--ease-in-out);
    --transition-transform: transform var(--transition-fast) var(--ease-in-out);
    --transition-all: all var(--transition-fast) var(--ease-in-out);

    /* ========== COMPONENT STATES ========== */

    /* Hover States */
    --hover-opacity: 0.9;
    --hover-bg-darken: rgba(0, 0, 0, 0.05);

    /* Active States */
    --active-bg-darken: rgba(0, 0, 0, 0.1);

    /* Disabled States */
    --disabled-opacity: 0.5;
    --disabled-cursor: not-allowed;

    /* ========== 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-notification: 1080;

    /* ========== BREAKPOINTS ========== */

    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* ========== BASE RESET ========== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-neutral-900);
    background-color: var(--color-neutral-50);
}

/* ========== ACCESSIBILITY ========== */

/* Focus Visible (modern browsers) */
:focus-visible {
    outline: 2px solid var(--color-primary-600);
    outline-offset: 2px;
}

/* Remove default focus outline */
:focus:not(:focus-visible) {
    outline: none;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ========== PRINT STYLES ========== */

@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
}