.notebook-header, .notebook-title { display: flex; align-items: center; gap: 12px; }
.notebook-header { justify-content: space-between; flex-wrap: wrap; padding-bottom: 16px; }
.notebook-title { min-width: 0; flex: 1 1 300px; }
.notebook-title .document-title { font-size: 1.6rem; }
.back-link { padding: 2px 6px; font-size: 1.3rem; text-decoration: none; }
.notebook-context { border-left: 1px solid var(--bs-border-color); padding-left: 12px; color: var(--bs-secondary-color); font-size: .8rem; }
.notebook-modes { display: flex; padding: 2px; background: var(--lt-inset); border-radius: 5px; }
.notebook-modes .btn { border: 0; color: var(--bs-secondary-color); padding: 3px 12px; }
.notebook-modes .btn.active { background: var(--lt-paper); color: var(--lt-ink); box-shadow: 0 1px 2px #172b2314; }
.notebook-workspace { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 28px; }
.notebook-sidebar { padding-top: 12px; min-width: 0; }
.notebook-outline { display: grid; gap: 2px; }
.notebook-outline-link { border: 0; background: none; padding: 5px 0; font: inherit; font-size: .82rem; line-height: 1.4; text-align: left; color: var(--bs-secondary-color); overflow-wrap: anywhere; }
.notebook-outline-link:hover { color: var(--lt-accent); }
.notebook-outline-link[data-level="h2"], .notebook-outline-link[data-level="h3"] { padding-left: 12px; }
.notebook-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; margin-top: 18px; padding-top: 8px; border-top: 1px solid var(--bs-border-color); color: var(--bs-secondary-color); font-size: .75rem; }
.notebook-meta .btn { padding: 4px 0; font-size: .75rem; }
.notebook-paper { min-width: 0; background: var(--lt-paper); border: 1px solid var(--bs-border-color); border-radius: 3px; }
.notebook .trix-content { font-family: Georgia, "Times New Roman", serif; font-size: 1.05rem; line-height: 1.65; overflow-wrap: anywhere; }
.notebook article.trix-content { padding: 24px 32px; }
.notebook trix-editor { min-height: 360px; padding: 20px 32px; border: 0; border-radius: 0; }
.notebook trix-editor:focus { outline: none; box-shadow: inset 3px 0 var(--lt-accent-soft); }
.notebook-editor-hint { margin: 0; padding: 8px 16px; border-top: 1px solid var(--bs-border-color); color: var(--bs-secondary-color); font-family: var(--bs-font-sans-serif); font-size: .72rem; }
.notebook-toolbar { position: sticky; top: 0; z-index: 10; background: var(--lt-paper); padding: 8px 12px 4px; border-bottom: 1px solid var(--bs-border-color); }
.notebook-toolbar .trix-button-row { flex-wrap: wrap; justify-content: flex-start; gap: 2px 10px; }
.notebook-toolbar .trix-button-group { border: 0; margin: 0 0 4px; }
.notebook-toolbar .trix-button-group:not(:first-child) { margin-left: 0; }
.notebook-toolbar .trix-button { border: 0; border-radius: 3px; color: var(--bs-secondary-color); font-size: .75rem; }
.notebook-toolbar .trix-button:not(:first-child) { border-left: 0; }
.notebook-toolbar .trix-button:hover { background-color: var(--lt-inset); }
.notebook-toolbar .trix-button.trix-active { background-color: var(--lt-accent-soft); color: var(--lt-accent); }
.notebook-toolbar .trix-button-group-spacer { display: none; }
.trix-content h1, .trix-content h2, .trix-content h3 { color: var(--lt-ink); font-weight: 600; line-height: 1.3; }
.trix-content h1 { font-size: 1.5rem; margin: 1.25rem 0 .5rem; }
.trix-content h2 { font-size: 1.25rem; margin: 1rem 0 .4rem; }
.trix-content h3 { font-size: 1.1rem; margin: 1rem 0 .4rem; }
.trix-content pre { background: var(--bs-tertiary-bg); border: 1px solid var(--bs-border-color); border-radius: 3px; padding: 12px; font-family: var(--bs-font-monospace); font-size: .85rem; line-height: 1.6; white-space: pre; overflow-x: auto; }
.trix-content blockquote { border: 0; border-left: 2px solid #b5c1b7; padding: 2px 0 2px 16px; margin: .75rem 0; color: var(--bs-secondary-color); }
.trix-content > :first-child, .trix-content .action-text-content > :first-child { margin-top: 0; }
.trix-content .attachment__caption { font: .75rem var(--bs-font-sans-serif); color: var(--bs-secondary-color); }
@media (max-width: 767.98px) {
  .notebook-workspace { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .notebook-sidebar { padding: 0; }
  .notebook-sidebar .section-label { margin-bottom: 4px; }
  .notebook-outline { display: flex; flex-wrap: wrap; gap: 0 14px; max-height: 100px; overflow-y: auto; }
  .notebook-outline-link[data-level] { padding-left: 0; }
  .notebook-meta { margin-top: 4px; padding-top: 0; border: 0; }
  .notebook article.trix-content, .notebook trix-editor { padding: 16px; }
  .notebook trix-editor { min-height: 280px; }
  .notebook-title .document-title { font-size: 1.35rem; }
}