/* ── Light / dark mode toggle button ───────────────────────────── */

#theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .15s;
  flex-shrink: 0;
}

#theme-toggle:hover {
  background: var(--surface2);
  color: var(--text);
  transform: rotate(15deg);
}