/**
 * Design Tokens - Mindeck Platform
 * Single source of truth for all visual design properties
 * Inspired by modern design systems (Google NotebookLM, Material Design)
 */

:root {
  /* ============================================
     COLOR PALETTE
     ============================================ */
  
  /* Primary Colors - Brand identity */
  --color-primary-50: #e3f2fd;
  --color-primary-100: #bbdefb;
  --color-primary-200: #90caf9;
  --color-primary-300: #64b5f6;
  --color-primary-400: #42a5f5;
  --color-primary-500: #2196f3;
  --color-primary-600: #1e88e5;
  --color-primary-700: #1976d2;
  --color-primary-800: #1565c0;
  --color-primary-900: #0d47a1;
  
  /* Secondary Colors - Accent and highlights */
  --color-secondary-50: #f3e5f5;
  --color-secondary-100: #e1bee7;
  --color-secondary-200: #ce93d8;
  --color-secondary-300: #ba68c8;
  --color-secondary-400: #ab47bc;
  --color-secondary-500: #9c27b0;
  --color-secondary-600: #8e24aa;
  --color-secondary-700: #7b1fa2;
  --color-secondary-800: #6a1b9a;
  --color-secondary-900: #4a148c;
  
  /* Neutral Colors - Text, backgrounds, borders */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #eeeeee;
  --color-neutral-300: #e0e0e0;
  --color-neutral-400: #bdbdbd;
  --color-neutral-500: #9e9e9e;
  --color-neutral-600: #757575;
  --color-neutral-700: #616161;
  --color-neutral-800: #424242;
  --color-neutral-900: #212121;
  --color-neutral-1000: #000000;
  
  /* Semantic Colors - Success, warning, error, info */
  --color-success-50: #e8f5e9;
  --color-success-500: #4caf50;
  --color-success-700: #388e3c;
  
  --color-warning-50: #fff3e0;
  --color-warning-500: #ff9800;
  --color-warning-700: #f57c00;
  
  --color-error-50: #ffebee;
  --color-error-500: #f44336;
  --color-error-700: #d32f2f;
  
  --color-info-50: #e3f2fd;
  --color-info-500: #2196f3;
  --color-info-700: #1976d2;
  
  /* ============================================
     THEME-SPECIFIC COLORS (Light Mode Default)
     ============================================ */
  
  /* Background colors */
  --bg-primary: var(--color-neutral-0);
  --bg-secondary: var(--color-neutral-50);
  --bg-tertiary: var(--color-neutral-100);
  --bg-elevated: var(--color-neutral-0);
  --bg-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text colors */
  --text-primary: var(--color-neutral-900);
  --text-secondary: var(--color-neutral-700);
  --text-tertiary: var(--color-neutral-600);
  --text-disabled: var(--color-neutral-400);
  --text-inverse: var(--color-neutral-0);
  
  /* Border colors */
  --border-primary: var(--color-neutral-300);
  --border-secondary: var(--color-neutral-200);
  --border-focus: var(--color-primary-500);
  
  /* Interactive colors */
  --interactive-primary: var(--color-primary-600);
  --interactive-primary-hover: var(--color-primary-700);
  --interactive-primary-active: var(--color-primary-800);
  --interactive-secondary: var(--color-secondary-600);
  --interactive-secondary-hover: var(--color-secondary-700);
  
  /* ============================================
     TYPOGRAPHY
     ============================================ */
  
  /* Font Families */
  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-serif: Georgia, "Times New Roman", Times, serif;
  --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
  
  /* Font Sizes - Type scale based on 1.25 ratio */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-md: 1.125rem;     /* 18px */
  --font-size-lg: 1.25rem;      /* 20px */
  --font-size-xl: 1.5rem;       /* 24px */
  --font-size-2xl: 1.875rem;    /* 30px */
  --font-size-3xl: 2.25rem;     /* 36px */
  --font-size-4xl: 3rem;        /* 48px */
  --font-size-5xl: 3.75rem;     /* 60px */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --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;
  
  /* ============================================
     SPACING SCALE (4px base unit)
     ============================================ */
  
  --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 */
  --space-32: 8rem;     /* 128px */
  
  /* ============================================
     SHADOWS (Elevation levels)
     ============================================ */
  
  --shadow-none: none;
  --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 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Focus shadow for accessibility */
  --shadow-focus: 0 0 0 3px rgba(33, 150, 243, 0.3);
  
  /* ============================================
     BORDER RADIUS
     ============================================ */
  
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;  /* Fully rounded */
  
  /* ============================================
     TRANSITIONS
     ============================================ */
  
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* ============================================
     Z-INDEX SCALE
     ============================================ */
  
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* ============================================
     BREAKPOINTS (for reference in JS)
     ============================================ */
  
  --breakpoint-mobile: 320px;
  --breakpoint-tablet: 768px;
  --breakpoint-desktop: 1024px;
  --breakpoint-wide: 1280px;
  --breakpoint-ultrawide: 1920px;
  
  /* ============================================
     CONTAINER WIDTHS
     ============================================ */
  
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* ============================================
   DARK MODE THEME
   ============================================ */

[data-theme="dark"] {
  /* Background colors */
  --bg-primary: var(--color-neutral-900);
  --bg-secondary: var(--color-neutral-800);
  --bg-tertiary: var(--color-neutral-700);
  --bg-elevated: var(--color-neutral-800);
  --bg-overlay: rgba(0, 0, 0, 0.7);
  
  /* Text colors */
  --text-primary: var(--color-neutral-50);
  --text-secondary: var(--color-neutral-300);
  --text-tertiary: var(--color-neutral-400);
  --text-disabled: var(--color-neutral-600);
  --text-inverse: var(--color-neutral-900);
  
  /* Border colors */
  --border-primary: var(--color-neutral-700);
  --border-secondary: var(--color-neutral-800);
  --border-focus: var(--color-primary-400);
  
  /* Interactive colors */
  --interactive-primary: var(--color-primary-500);
  --interactive-primary-hover: var(--color-primary-400);
  --interactive-primary-active: var(--color-primary-300);
  --interactive-secondary: var(--color-secondary-500);
  --interactive-secondary-hover: var(--color-secondary-400);
  
  /* Adjust shadows for dark mode */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --shadow-focus: 0 0 0 3px rgba(33, 150, 243, 0.4);
}

/* ============================================
   REDUCED MOTION PREFERENCE
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
    --transition-slower: 0ms;
  }
}