@media (prefers-color-scheme: dark) {
  /* Default mono theme - dark mode */
  :root {
    font-family: sans-serif, system-ui;
    --background-color: #1a1a1a;
    --text-color: #f0f0f0;
    --header-footer-bg: #2a2a2a;
    --button-bg: #4a4a4a;
    --button-hover-bg: #6a6a6a;
    --link-color: #9a9a9a;
    --link-hover-color: #b0b0b0;
    --card-bg: #2a2a2a;
    --border-color: #404040;
    --error-color: #ff6b6b;
    --placeholder-color: #666666;
    --secondary-text-color: #b0b0b0;
    --muted-bg: #333333;
  } 
}

@media (prefers-color-scheme: light) {
  /* Default mono theme - light mode */
  :root {
    --background-color: #f0f0f0;
    --text-color: #1a1a1a;
    --header-footer-bg: #e0e0e0;
    --button-bg: #b0b0b0;
    --button-hover-bg: #9a6a6a;
    --link-color: #6a6a6a;
    --link-hover-color: #4a4a4a;
    --card-bg: #e0e0e0;
    --border-color: #cccccc;
    --error-color: #dc2626;
    --placeholder-color: #999999;
    --secondary-text-color: #4a4a4a;
    --muted-bg: #d0d0d0;
  }
}