:root{--border: #1e2a3a;--muted: #8aa0b2}*{box-sizing:border-box}body{margin:0;background:#050b12;color:#d7e2ee;font-family:system-ui,sans-serif}.sitebar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:10px 12px;background:#091422;border-bottom:1px solid var(--border)}.menu-btn{background:#0b1a2a;color:#d7e2ee;border:1px solid var(--border);padding:6px 10px;border-radius:8px}.crumbs{display:inline-flex;align-items:center;gap:8px;margin-left:6px;flex-wrap:nowrap}.chap-controls{margin-left:auto;display:inline-flex;gap:6px;align-items:center}.crumb-ellipsis,.crumb-sep{opacity:.6}.crumb-btn{border:1px solid var(--border);background:#0b1a2a;color:#d7e2ee;padding:6px 10px;border-radius:8px;font:inherit;line-height:1;cursor:pointer;max-width:36ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.crumb-btn[disabled]{opacity:.55;cursor:default;pointer-events:none}#crumbCurrent{max-width:42ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@media(max-width:720px){#crumbCurrent{max-width:28ch}.crumb-btn{max-width:26ch}}.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{position:relative;padding:12px 12px 40px;border-right:1px solid var(--border);background:#0a1320}.brand{display:block;font-weight:700;margin:8px 0 18px;text-decoration:none;color:inherit}.nav-section{margin:16px 0 6px;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}main{padding:20px 20px 40px}.overlay{position:fixed;inset:0;background:#0006;z-index:15}.scroll-top-btn{position:fixed;right:1rem;bottom:1.5rem;z-index:40;padding:.5rem .75rem;border-radius:999px;border:1px solid var(--border);background:#0b1a2a;color:#d7e2ee;font:inherit;cursor:pointer;box-shadow:0 4px 12px #0000004d;opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .2s ease,transform .2s ease}.scroll-top-btn[data-visible=true]{opacity:1;pointer-events:auto;transform:translateY(0)}.sidebar-collapse{position:fixed;left:0;bottom:1.5rem;width:280px;display:flex;justify-content:flex-end;padding:0 .75rem;pointer-events:none;z-index:60}.sidebar:not(:has(details.tree-item[open])) .sidebar-collapse{display:none}.nav-collapse-btn{z-index:40;padding:.35rem .6rem;border-radius:999px;border:1px solid var(--border);background:#050b12;color:#d7e2ee;font:inherit;font-size:.75rem;line-height:1;cursor:pointer;box-shadow:0 4px 12px #0000004d;opacity:.85;pointer-events:auto;transform:translateY(4px);transition:opacity .2s ease,transform .2s ease,box-shadow .2s ease}.nav-collapse-btn:hover{opacity:1;transform:translateY(0);box-shadow:0 6px 18px #0006}.sidebar-find{position:sticky;top:.25rem;z-index:50;display:flex;justify-content:flex-end;pointer-events:none;padding-right:.25rem}.nav-find-btn{pointer-events:none;padding:.35rem .6rem;border-radius:999px;border:1px solid var(--border);background:#050b12;color:#d7e2ee;font:inherit;font-size:.75rem;line-height:1;cursor:pointer;box-shadow:0 4px 12px #0000004d;opacity:0;transform:translateY(4px);transition:opacity .2s ease,transform .2s ease,box-shadow .2s ease}.nav-find-btn[data-visible=true]{opacity:.9;pointer-events:auto;transform:translateY(0)}.nav-find-btn[data-visible=true]:hover{opacity:1;box-shadow:0 6px 18px #0006}@media(max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:fixed;inset:48px auto 0 0;width:78%;max-width:360px;transform:translate(-100%);transition:transform .2s ease;z-index:30}.sidebar[data-open=true]{transform:translate(0)}}.tree{list-style:none;margin:0;padding:0}.tree li{margin:4px 0}.tree a.nav-link{display:block;padding:8px 10px;border-radius:6px;text-decoration:none;color:inherit}.tree .tree-item>summary::-webkit-details-marker{display:none}.tree .tree-item[open]>summary{background:#0b1220;outline:1px solid var(--border)}.tree .caret:before{content:"▸";display:inline-block;transform:translateY(-1px)}.tree .tree-item[open] .caret:before{content:"▾"}.tree .tree-children{list-style:none;margin:6px 0 0;padding-left:14px;border-left:1px dashed var(--border)}.tree [aria-current=page]{background:#0b1220;outline:1px solid var(--border)}.tree .tree-item>summary{display:flex;align-items:center;gap:6px;padding:6px;margin:0;list-style:none;cursor:pointer;border-radius:6px}.pdf-embed object{width:100%;height:clamp(420px,70vh,900px);border:1px solid var(--border);border-radius:8px}.pdf-embed figcaption{color:var(--muted);font-size:.9rem;margin-top:6px}html,body{height:100%;overflow:hidden}.app{height:calc(100% - var(--sitebar-h, 48px));overflow:hidden}.sidebar,main{overflow:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;scrollbar-gutter:stable}.app[data-nav=closed]{grid-template-columns:0 1fr}.app[data-nav=closed] .sidebar{visibility:hidden}main{padding-bottom:calc(40px + 33vh)}.sidebar{padding-bottom:calc(40px + 33vh)}a,a:visited{color:#ff4fa3}a:hover,a:focus{color:#ff7fc1}.sidebar .tree li[class^=tree-depth-]>details.tree-item[open]>summary{position:sticky;background:#0b1220;outline:1px solid var(--border);z-index:1}.sidebar li.tree-depth-0>details.tree-item[open]>summary{top:0}.sidebar li.tree-depth-1>details.tree-item[open]>summary{top:2.4rem}.sidebar li.tree-depth-2>details.tree-item[open]>summary{top:4.8rem}.sidebar li.tree-depth-3>details.tree-item[open]>summary{top:7.2rem}.sidebar .tree li[class^=tree-depth-]>details.tree-item[open]>ul.tree-children{position:relative;z-index:0}.sidebar li.tree-depth-0>details.tree-item[open]>summary.is-sticky-active{z-index:40}.sidebar li.tree-depth-1>details.tree-item[open]>summary.is-sticky-active{z-index:30}.sidebar li.tree-depth-2>details.tree-item[open]>summary.is-sticky-active{z-index:20}.sidebar li.tree-depth-3>details.tree-item[open]>summary.is-sticky-active{z-index:10}.tree .tree-item>summary{position:relative;overflow:hidden}.tree .tree-item>summary .caret,.tree .tree-item>summary .caret:before{position:relative;z-index:-1}