:root {
  --bg: #f7f7f9;
  --text: #111;
  --muted: #6b7280;
  --spinner-size: 72px;
  --spinner-stroke: 8px;
}

html,body {
  height: 100%;
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: var(--bg);
  color: var(--text);
}

/* Center content */
.center {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  box-sizing: border-box;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
}

.message {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--muted);
}

/* SVG spinner sizing */
.spinner {
  width: var(--spinner-size);
  height: var(--spinner-size);
  display: inline-block;
}

/* For users with reduced motion, disable rotation */
@media (prefers-reduced-motion: reduce) {
  .rotating { animation: none !important; transform: none !important; }
}

/* Fallback CSS spinner (invisible if SVG rotating used) */
.css-spinner {
  width: var(--spinner-size);
  height: var(--spinner-size);
  border-radius: 50%;
  border: var(--spinner-stroke) solid rgba(0,0,0,0.08);
  border-top-color: rgba(0,0,0,0.5);
  animation: spin 1s linear infinite;
  box-sizing: border-box;
  display: none; /* prefer SVG; shown if SVG not supported */
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* small screens tweak */
@media (max-width:420px) {
  :root { --spinner-size: 56px; --spinner-stroke: 6px; }
  .message { font-size: 1rem; }
}