:root { color-scheme: light dark; }
html, body {
  margin: 0;
  min-height: 100%;
  background: #f1f6f5;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
#appFrame {
  display: block;
  width: 100%;
  min-height: 100vh;
  border: 0;
  background: #eef4f3;
}
#configError {
  display: none;
  max-width: 680px;
  margin: 40px auto;
  padding: 20px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 12px;
  color: #333;
}
@media (prefers-color-scheme: dark) {
  html, body { background: #0f1716; }
}