/* ==========================================================================
   Theme System - CSS Custom Properties
   ========================================================================== */

/* Default Light Theme */
:root {
  /* Primary Colors */
  --primary-color: #2196F3;
  --primary-hover: #1976D2;
  --primary-light: #BBDEFB;
  --primary-dark: #0D47A1;
  
  /* Secondary Colors */
  --secondary-color: #4CAF50;
  --secondary-hover: #388E3C;
  --secondary-light: #C8E6C9;
  --secondary-dark: #1B5E20;
  
  /* Brand Colors */
  --brand-primary: #4f2b1b;
  --brand-secondary: #8b4513;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f5f9;
  --bg-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text Colors */
  --text-primary: #333333;
  --text-secondary: #6c757d;
  --text-tertiary: #999999;
  --text-inverse: #ffffff;
  --text-muted: #9ca3af;
  
  /* Border Colors */
  --border-primary: #e0e0e0;
  --border-secondary: #dee2e6;
  --border-focus: #2196F3;
  --border-error: #dc3545;
  --border-success: #28a745;
  
  /* Status Colors */
  --success-color: #28a745;
  --success-bg: #d4edda;
  --warning-color: #ffc107;
  --warning-bg: #fff3cd;
  --error-color: #dc3545;
  --error-bg: #f8d7da;
  --info-color: #17a2b8;
  --info-bg: #d1ecf1;
  
  /* Shadow Colors */
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --shadow-heavy: rgba(0, 0, 0, 0.25);
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-xxl: 1.5rem;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Dark Theme */
[data-theme="dark"] {
  /* Primary Colors - Adjusted for dark theme */
  --primary-color: #64b5f6;
  --primary-hover: #42a5f5;
  --primary-light: #1e3a8a;
  --primary-dark: #0d47a1;
  
  /* Secondary Colors */
  --secondary-color: #81c784;
  --secondary-hover: #66bb6a;
  --secondary-light: #2e7d32;
  --secondary-dark: #1b5e20;
  
  /* Brand Colors */
  --brand-primary: #8b4513;
  --brand-secondary: #a0522d;
  
  /* Background Colors */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --bg-overlay: rgba(0, 0, 0, 0.8);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --text-inverse: #1a1a1a;
  --text-muted: #6b7280;
  
  /* Border Colors */
  --border-primary: #404040;
  --border-secondary: #525252;
  --border-focus: #64b5f6;
  --border-error: #ef4444;
  --border-success: #10b981;
  
  /* Status Colors */
  --success-color: #10b981;
  --success-bg: #064e3b;
  --warning-color: #f59e0b;
  --warning-bg: #78350f;
  --error-color: #ef4444;
  --error-bg: #7f1d1d;
  --info-color: #06b6d4;
  --info-bg: #164e63;
  
  /* Shadow Colors */
  --shadow-light: rgba(0, 0, 0, 0.3);
  --shadow-medium: rgba(0, 0, 0, 0.5);
  --shadow-heavy: rgba(0, 0, 0, 0.7);
}

/* High Contrast Theme */
[data-theme="high-contrast"] {
  --primary-color: #0000ff;
  --primary-hover: #000080;
  --bg-primary: #ffffff;
  --bg-secondary: #f0f0f0;
  --text-primary: #000000;
  --text-secondary: #000000;
  --border-primary: #000000;
  --border-secondary: #000000;
}

/* Prefers Color Scheme Media Query */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    /* Apply dark theme variables when user prefers dark mode */
    --primary-color: #64b5f6;
    --primary-hover: #42a5f5;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-primary: #404040;
    --border-secondary: #525252;
  }
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0s;
    --transition-normal: 0s;
    --transition-slow: 0s;
  }
}

/* Theme Toggle Animation */
* {
  transition: 
    background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal);
}

/* Focus Indicators */
:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}