/* =============================================================================
   THEMES.CSS - Design Tokens & CSS Custom Properties
   ============================================================================= */

:root {
  /* ===== COLOR SYSTEM ===== */
  
  /* Primary Colors */
  --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 */
  --color-secondary-50: #f0f9ff;
  --color-secondary-100: #e0f2fe;
  --color-secondary-200: #bae6fd;
  --color-secondary-300: #7dd3fc;
  --color-secondary-400: #38bdf8;
  --color-secondary-500: #0ea5e9;
  --color-secondary-600: #0284c7;
  --color-secondary-700: #0369a1;
  --color-secondary-800: #075985;
  --color-secondary-900: #0c4a6e;
  --color-secondary-950: #082f49;
  
  /* Accent Colors */
  --color-accent-50: #f0fdf4;
  --color-accent-100: #dcfce7;
  --color-accent-200: #bbf7d0;
  --color-accent-300: #86efac;
  --color-accent-400: #4ade80;
  --color-accent-500: #22c55e;
  --color-accent-600: #16a34a;
  --color-accent-700: #15803d;
  --color-accent-800: #166534;
  --color-accent-900: #14532d;
  --color-accent-950: #052e16;
  
  /* Neutral Colors */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;
  --color-neutral-950: #020617;
  
  /* Semantic Colors */
  --color-success: var(--color-accent-500);
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: var(--color-primary-500);
  
  /* ===== SPACING SYSTEM ===== */
  --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 */
  --space-40: 10rem;    /* 160px */
  --space-48: 12rem;    /* 192px */
  --space-56: 14rem;    /* 224px */
  --space-64: 16rem;    /* 256px */
  
  /* ===== TYPOGRAPHY ===== */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;
  
  --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-size-6xl: 3.75rem;   /* 60px */
  --font-size-7xl: 4.5rem;    /* 72px */
  --font-size-8xl: 6rem;      /* 96px */
  --font-size-9xl: 8rem;      /* 128px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;
  
  --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;
  
  /* ===== 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);
  
  /* ===== BORDER RADIUS ===== */
  --radius-none: 0;
  --radius-sm: 0.125rem;   /* 2px */
  --radius-md: 0.375rem;   /* 6px */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  --radius-2xl: 1rem;      /* 16px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms ease-out;
  --transition-normal: 250ms ease-out;
  --transition-slow: 350ms ease-out;
  --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* ===== Z-INDEX ===== */
  --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;
  
  /* ===== LAYOUT ===== */
  --container-max-width: 1200px;
  --header-height: 4rem;
  --sidebar-width: 16rem;
  
  /* ===== FOCUS ===== */
  --focus-ring: 0 0 0 3px rgb(59 130 246 / 0.5);
  --focus-ring-offset: 2px;
}

/* ===== DARK MODE ===== */
@media (prefers-color-scheme: dark) {
  :root {
    /* Override colors for dark mode */
    --color-background: var(--color-neutral-900);
    --color-background-elevated: var(--color-neutral-800);
    --color-background-muted: var(--color-neutral-700);
    --color-foreground: var(--color-neutral-50);
    --color-foreground-muted: var(--color-neutral-400);
    --color-border: var(--color-neutral-700);
    --color-border-muted: var(--color-neutral-600);
  }
}

/* ===== LIGHT MODE ===== */
@media (prefers-color-scheme: light) {
  :root {
    /* Override colors for light mode */
    --color-background: var(--color-neutral-50);
    --color-background-elevated: var(--color-neutral-100);
    --color-background-muted: var(--color-neutral-200);
    --color-foreground: var(--color-neutral-900);
    --color-foreground-muted: var(--color-neutral-600);
    --color-border: var(--color-neutral-300);
    --color-border-muted: var(--color-neutral-200);
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-normal: 0ms;
    --transition-slow: 0ms;
    --transition-bounce: 0ms;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}