/* dark.css */
html[data-theme='dark'] {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #282828;
  
  --bg-gradient: linear-gradient(135deg, #121212 0%, #1e1e1e 100%);
  --bg-surface-gradient: linear-gradient(145deg, #1e1e1e 0%, #222222 100%);
  --bg-glass: rgba(30, 30, 30, 0.8);
  
  --text-primary: #f8f9fa;
  --text-secondary: #adb5bd;
  --text-muted: #6c757d;
  
  --border-color: #333333;
  
  --color-primary: #3b82f6;
  --color-success: #22c55e;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #0ea5e9;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.9);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.9), 0 2px 4px -1px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.9), 0 4px 6px -2px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.2);
  
  --transition-speed: 0.25s;
  
  /* Semantic classes */
  --surface-default: var(--bg-primary);
  --surface-raised: var(--bg-secondary);
}