.textbook-theme{--book-text:var(--book-dark-text);--book-tint:color-mix(in srgb,var(--book-main) 16%,var(--bg-card));--book-line:color-mix(in srgb,var(--book-main) 35%,transparent);--primary:var(--book-main);--primary-light:var(--book-dark-text);--primary-glow:color-mix(in srgb,var(--book-main) 22%,transparent);--border-hover:var(--book-dark-text)}[data-theme=light] .textbook-theme{--book-text:var(--book-main);--book-tint:var(--book-wash);--primary-light:var(--book-main);--border-hover:var(--book-main)}.textbook-editor{max-width:1040px;container:textbook-editor/inline-size}.textbook-editor__actions,.textbook-editor__header{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:space-between}.textbook-editor__header{margin-bottom:24px}.textbook-editor h1{font-size:1.7rem}.textbook-editor h2{font-size:1.15rem}.textbook-editor__muted{color:var(--text-secondary);font-size:.875rem}.textbook-editor__pickers{display:grid;grid-template-columns:1fr 1fr 2fr;grid-gap:12px;gap:12px;padding:18px;background:var(--bg-card);border:1px solid var(--border);border-top:3px solid var(--book-main);border-radius:10px;margin-bottom:20px}.textbook-editor__field{display:flex;min-width:0;flex-direction:column;gap:6px;font-size:.9rem;margin-bottom:14px}.textbook-editor__field>span{font-weight:600}.textbook-editor input,.textbook-editor select,.textbook-editor textarea{width:100%;min-width:0;padding:10px 12px;border:1px solid var(--border-hover);border-radius:6px;color:var(--text-primary);background:var(--bg-primary);font:inherit;font-size:16px;line-height:1.6}.textbook-editor textarea{resize:vertical;min-height:80px}.textbook-editor__grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:0 18px;gap:0 18px}.textbook-editor__section{margin:18px 0;padding:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:10px}.textbook-editor__section>h2,.textbook-editor__section>summary{margin-bottom:16px;font-weight:700}.textbook-editor summary{cursor:pointer;min-height:44px;display:flex;align-items:center}.textbook-editor__node{padding:8px 0 8px 14px;margin-bottom:12px;border-left:2px solid var(--primary-glow);min-width:0}.textbook-editor__node>legend{color:var(--primary-light);font-size:.86rem;padding:0 6px}.textbook-editor fieldset.textbook-editor__node{border-top:0;border-right:0;border-bottom:0}.textbook-editor__actions{padding:14px 0;border-top:1px solid var(--border)}.textbook-editor__actions>div{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.textbook-editor__message{padding:12px 14px;margin-bottom:16px;border:1px solid var(--border-hover);border-radius:6px;overflow-wrap:anywhere}.textbook-editor__message[role=alert]{border-color:var(--danger)}.textbook-editor__preview{background:var(--book-preview-paper);color:var(--book-preview-ink);border-radius:10px;border:1px solid var(--book-preview-border);padding:28px;margin:18px 0;overflow-wrap:anywhere}.textbook-editor__preview h2,.textbook-editor__preview h3{color:var(--book-main);margin:12px 0}.textbook-editor__preview h2{background:var(--book-wash);padding:18px;border-radius:6px;font-size:1.4rem}.textbook-editor__preview p{white-space:pre-wrap;margin:8px 0;line-height:1.9}.textbook-editor__preview dl{margin:12px 0}.textbook-editor__preview dt{font-weight:600;font-size:.85rem;color:var(--book-preview-muted);margin-top:10px}.textbook-editor__preview dd{margin:4px 0 12px 12px}.textbook-editor__preview hr{border:0;border-top:1px solid var(--book-preview-border);margin:24px 0}@container textbook-editor (max-width: 640px){.textbook-editor__grid,.textbook-editor__pickers{grid-template-columns:1fr}.textbook-editor__preview,.textbook-editor__section{padding:16px}.textbook-editor__node{padding-left:10px}.textbook-editor__header{align-items:flex-start}}