.theme-toggle {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--border-color, var(--slide-border, #64748b));
  border-radius: 999px;
  background: var(--control-background, var(--slide-panel, #ffffff));
  color: var(--text-primary, var(--slide-text, #111827));
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow-small, none);
}

.theme-toggle:hover {
  background: var(--hover-background, var(--slide-code-bg, #e5e7eb));
  border-color: var(--accent-color, var(--slide-accent, #2457a6));
}

.theme-toggle:focus-visible {
  outline: 3px solid var(--focus-ring, #2563eb);
  outline-offset: 3px;
}

body > .theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
}

/* Fristående diagram behåller sina datakodade färger; endast sidytan följer temat. */
:root[data-theme="dark"] body:not(.presentation-body) > .container {
  border-color: var(--border-color, #45505e);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
}

@media (max-width: 720px) {
  .navbar .theme-toggle { order: 2; }
}