.book-layout[data-astro-cid-g24ahyix]{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 100px);max-width:var(--max-width);margin:0 auto}.book-sidebar[data-astro-cid-g24ahyix]{position:sticky;top:108px;height:calc(100vh - 108px);overflow-y:auto;border-right:1px solid var(--border);background:var(--bg);padding:0;scrollbar-width:thin;scrollbar-color:var(--border) transparent;transition:background-color .4s}.book-sidebar[data-astro-cid-g24ahyix]::-webkit-scrollbar{width:4px}.book-sidebar[data-astro-cid-g24ahyix]::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.book-sidebar__header[data-astro-cid-g24ahyix]{padding:1.25rem 1.25rem 1rem;border-bottom:1px solid var(--border-light);position:sticky;top:0;background:var(--bg);z-index:2}.book-sidebar__back[data-astro-cid-g24ahyix]{display:inline-flex;align-items:center;gap:.3rem;font-family:var(--font-ui);font-size:.9rem;font-weight:600;color:var(--text-secondary);text-decoration:none;margin-bottom:.5rem;transition:color .2s}.book-sidebar__back[data-astro-cid-g24ahyix]:hover{color:var(--accent)}.book-sidebar__book-title[data-astro-cid-g24ahyix]{font-family:var(--font-display);font-size:1.35rem;font-weight:600;color:var(--text-heading);line-height:1.3}.book-sidebar__close[data-astro-cid-g24ahyix]{display:none;position:absolute;top:1rem;right:1rem;background:none;border:none;color:var(--text-secondary);cursor:pointer}.book-sidebar__parts[data-astro-cid-g24ahyix]{display:flex;gap:0;padding:0;border-bottom:1px solid var(--border-light);overflow-x:auto;scrollbar-width:none}.book-sidebar__parts[data-astro-cid-g24ahyix]::-webkit-scrollbar{display:none}.book-sidebar__part-tab[data-astro-cid-g24ahyix]{flex:1;text-align:center;font-family:var(--font-ui);font-size:.88rem;font-weight:600;letter-spacing:.03em;padding:.75rem .5rem;color:var(--text-secondary);text-decoration:none;border-bottom:2px solid transparent;transition:all .2s;white-space:nowrap}.book-sidebar__part-tab[data-astro-cid-g24ahyix]:hover{color:var(--text-heading);background:var(--bg-warm)}.book-sidebar__part-tab[data-astro-cid-g24ahyix].is-active{color:var(--accent);border-bottom-color:var(--accent)}.book-sidebar__toc[data-astro-cid-g24ahyix]{padding:.5rem 0 2rem}.toc-group[data-astro-cid-g24ahyix]{border-bottom:1px solid var(--border-light)}.toc-group[data-astro-cid-g24ahyix]:last-child{border-bottom:none}.toc-group__heading[data-astro-cid-g24ahyix]{display:flex;align-items:center;justify-content:space-between;width:100%;padding:.85rem 1.25rem;background:none;border:none;cursor:pointer;font-family:var(--font-display);font-size:1.15rem;font-weight:600;color:var(--text-heading);text-align:left;transition:color .2s}.toc-group__heading[data-astro-cid-g24ahyix]:hover{color:var(--accent)}.toc-group__chevron[data-astro-cid-g24ahyix]{font-size:22px;color:var(--text-muted);transition:transform .25s ease}.toc-group__heading[data-astro-cid-g24ahyix][aria-expanded=false] .toc-group__chevron[data-astro-cid-g24ahyix]{transform:rotate(-90deg)}.toc-group__items[data-astro-cid-g24ahyix]{list-style:none;padding:0 0 .5rem;overflow:hidden;transition:max-height .3s ease}.toc-group__heading[data-astro-cid-g24ahyix][aria-expanded=false]+.toc-group__items[data-astro-cid-g24ahyix]{max-height:0!important;padding:0}.toc-item[data-astro-cid-g24ahyix]{display:block;padding:.5rem 1.25rem .5rem 1.75rem;text-decoration:none;font-family:var(--font-ui);font-size:.98rem;color:var(--text-secondary);line-height:1.4;border-left:2px solid transparent;transition:all .15s}.toc-item[data-astro-cid-g24ahyix]:hover{color:var(--text-heading);background:var(--bg-warm)}.toc-item[data-astro-cid-g24ahyix].is-active{color:var(--accent);font-weight:600;border-left-color:var(--accent);background:var(--accent-subtle)}.toc-item__label[data-astro-cid-g24ahyix]{display:block}.toc-item__sub[data-astro-cid-g24ahyix]{display:block;font-size:.85rem;color:var(--text-muted);margin-top:.1rem}.book-content[data-astro-cid-g24ahyix]{padding:2.5rem 3rem 4rem;max-width:780px;animation:fadeUp .5s ease}.book-mobile-bar[data-astro-cid-g24ahyix]{display:none;position:sticky;top:108px;z-index:50;background:var(--bg);border-bottom:1px solid var(--border);padding:0 1rem}.book-mobile-bar__toggle[data-astro-cid-g24ahyix]{display:flex;align-items:center;gap:.5rem;width:100%;padding:.85rem 0;background:none;border:none;cursor:pointer;font-family:var(--font-ui);font-size:.98rem;font-weight:600;color:var(--accent)}.book-mobile-bar__toggle[data-astro-cid-g24ahyix] .material-icons-outlined[data-astro-cid-g24ahyix]{font-size:22px}.book-overlay[data-astro-cid-g24ahyix]{display:none;position:fixed;inset:0;background:#0006;z-index:90;opacity:0;transition:opacity .3s}.book-overlay[data-astro-cid-g24ahyix].is-open{display:block;opacity:1}@media(max-width:900px){.book-layout[data-astro-cid-g24ahyix]{grid-template-columns:1fr}.book-mobile-bar[data-astro-cid-g24ahyix]{display:block}.book-sidebar[data-astro-cid-g24ahyix]{position:fixed;top:0;left:0;width:320px;height:100vh;z-index:100;transform:translate(-100%);transition:transform .3s ease;box-shadow:4px 0 24px #00000026}.book-sidebar[data-astro-cid-g24ahyix].is-open{transform:translate(0)}.book-sidebar__close[data-astro-cid-g24ahyix]{display:block}.book-sidebar__header[data-astro-cid-g24ahyix]{top:0}.book-content[data-astro-cid-g24ahyix]{padding:2rem 1.5rem 4rem}}@media(max-width:480px){.book-sidebar[data-astro-cid-g24ahyix]{width:85vw}.book-content[data-astro-cid-g24ahyix]{padding:1.5rem 1rem 3rem}}