/**
 * Theme Variables
 * Dark/Light theme support using CSS custom properties
 */

:root {
  /* Light theme (default) */
  --color-bg: #f8fafc;
  --color-bg-secondary: #ffffff;
  --color-bg-tertiary: #f1f5f9;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-text: #ffffff;
  
  --color-secondary: #64748b;
  --color-secondary-hover: #475569;
  --color-secondary-text: #ffffff;
  
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  
  /* Board specific */
  --board-bg: #ffffff;
  --board-border: #1e293b;
  --board-border-thin: #cbd5e1;
  --cell-bg: #ffffff;
  --cell-bg-hover: #f1f5f9;
  --cell-bg-selected: #dbeafe;
  --cell-bg-highlighted: #e0f2fe;
  --cell-bg-original: #f8fafc;
  --cell-text-original: #1e293b;
  --cell-text-player: #3b82f6;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --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);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Dark theme */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #334155;
  --color-border-strong: #475569;
  
  --color-primary: #60a5fa;
  --color-primary-hover: #3b82f6;
  --color-primary-text: #0f172a;
  
  --color-secondary: #94a3b8;
  --color-secondary-hover: #64748b;
  --color-secondary-text: #0f172a;
  
  /* Board specific */
  --board-bg: #1e293b;
  --board-border: #f1f5f9;
  --board-border-thin: #475569;
  --cell-bg: #1e293b;
  --cell-bg-hover: #334155;
  --cell-bg-selected: #1e3a5f;
  --cell-bg-highlighted: #1e3a5f;
  --cell-bg-original: #0f172a;
  --cell-text-original: #f1f5f9;
  --cell-text-player: #60a5fa;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* System preference detection */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    --color-border: #334155;
    --color-border-strong: #475569;
    
    --color-primary: #60a5fa;
    --color-primary-hover: #3b82f6;
    --color-primary-text: #0f172a;
    
    --color-secondary: #94a3b8;
    --color-secondary-hover: #64748b;
    --color-secondary-text: #0f172a;
    
    --board-bg: #1e293b;
    --board-border: #f1f5f9;
    --board-border-thin: #475569;
    --cell-bg: #1e293b;
    --cell-bg-hover: #334155;
    --cell-bg-selected: #1e3a5f;
    --cell-bg-highlighted: #1e3a5f;
    --cell-bg-original: #0f172a;
    --cell-text-original: #f1f5f9;
    --cell-text-player: #60a5fa;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  }
}