.notebook-startup { display: none; }
html[data-entry="notebook"] .landing-page { display: none; }
html[data-entry="notebook"] .notebook-startup {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  min-height: 100vh;
  min-height: 100svh;
  padding: 24px;
  color: var(--muted);
  background: var(--bg);
}
.notebook-startup img { width: 44px; height: 44px; }
.notebook-startup p { display: flex; align-items: center; gap: 10px; margin: 0; font-size: 16px; line-height: 1.8; }
.notebook-startup-spinner { width: 16px; height: 16px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: notebook-startup-spin 900ms linear infinite; }
@keyframes notebook-startup-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .notebook-startup-spinner { animation: none; } }