.handbook{display:flex;flex-direction:column;min-height:100vh;background:var(--background);color:var(--foreground);font-family:var(--font-mono, monospace)}.handbook-bar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:8px;height:44px;padding:0 12px;background:var(--chrome);color:var(--chrome-ink);border-bottom:1px solid var(--chrome-rule);font-size:12.5px;white-space:nowrap}.handbook-bar a{color:inherit;text-decoration:none}.handbook-back{display:inline-flex;align-items:center;gap:4px;padding:3px 8px 3px 5px;border:1px solid var(--chrome-rule);border-radius:5px;color:var(--chrome-dim)}.handbook-back:hover{color:var(--chrome-ink);background:var(--chrome-hover);border-color:var(--chrome-hover)}.handbook-book{color:var(--chrome-accent);font-weight:700}.handbook-sep,.handbook-crumb-link{color:var(--chrome-dim)}.handbook-crumb-link:hover{color:var(--chrome-ink)}.handbook-here{color:var(--chrome-ink);overflow:hidden;text-overflow:ellipsis}.handbook-bar-right{margin-left:auto;display:flex;align-items:center;gap:10px}.handbook-iconlink{color:var(--chrome-dim);display:inline-flex}.handbook-iconlink:hover{color:var(--chrome-ink)}.handbook-menu{display:none;background:none;border:0;color:var(--chrome-ink);cursor:pointer;padding:4px;margin-left:-4px}.handbook-body{display:grid;grid-template-columns:288px minmax(0,1fr);align-items:start;flex:1}.handbook-body.has-toc{grid-template-columns:288px minmax(0,1fr) 236px}.handbook-nav{position:sticky;top:44px;height:calc(100vh - 44px);overflow-y:auto;overscroll-behavior:contain;background:var(--chrome);color:var(--chrome-ink);border-right:1px solid var(--chrome-rule);padding:8px 0 40px}.handbook-nav-head{padding:6px 14px 10px;margin:0;font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--chrome-dim)}.handbook-nav .tree,.handbook-nav .tree-children{list-style:none;margin:0;padding:0}.tree-item{margin:0}.tree-row{display:flex;align-items:center;gap:6px;width:100%;box-sizing:border-box;padding:3px 12px 3px calc(10px + var(--depth, 0) * 13px);font:inherit;font-size:12.5px;line-height:1.35;text-align:left;text-decoration:none;color:var(--chrome-dim);background:none;border:0;border-left:2px solid transparent;cursor:pointer}.tree-row:hover{background:var(--chrome-hover);color:var(--chrome-ink)}.tree-folder .tree-name{color:var(--chrome-ink);font-weight:600}.tree-caret{flex:none;width:11px;height:11px;color:var(--chrome-dim);transition:transform .12s ease;transform:rotate(90deg)}.tree-folder[aria-expanded=false] .tree-caret{transform:rotate(0)}.tree-folder[aria-expanded=false]+.tree-children{display:none}.tree-dot{flex:none;width:4px;height:4px;margin:0 3.5px;border-radius:50%;background:currentColor;opacity:.45}.tree-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tree-note.is-current{color:var(--chrome-accent);background:var(--chrome-hover);border-left-color:var(--chrome-accent)}.tree-note.is-current .tree-dot{opacity:1}.handbook-doc{min-width:0;width:100%;max-width:860px;margin:0 auto;padding:26px 44px 96px;box-sizing:border-box}.handbook-doc :is(h1,h2,h3,h4){scroll-margin-top:60px}.handbook-crumb{font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);margin:0 0 10px}.handbook-title{font-family:var(--font-display, var(--font-mono));font-size:clamp(1.55rem,1.2rem + 1.4vw,2rem);line-height:1.15;margin:0 0 18px;color:var(--foreground)}.handbook-intro{color:var(--soft);font-size:.95rem;line-height:1.6}.handbook-toc{position:sticky;top:44px;height:calc(100vh - 44px);overflow-y:auto;padding:26px 16px 40px;border-left:1px solid var(--rule);font-size:12px}.handbook-backdrop{display:none}@media (max-width: 1100px){.handbook-body.has-toc{grid-template-columns:288px minmax(0,1fr)}.handbook-toc{display:none}}@media (max-width: 820px){.handbook-menu{display:inline-flex}.handbook-body,.handbook-body.has-toc{grid-template-columns:minmax(0,1fr)}.handbook-nav{position:fixed;top:44px;left:0;width:284px;max-width:84vw;z-index:50;transform:translate(-100%);transition:transform .18s ease}.handbook[data-open] .handbook-nav{transform:none}.handbook[data-open] .handbook-backdrop{display:block;position:fixed;inset:44px 0 0;z-index:45;background:#00000080}.handbook-doc{padding:20px 18px 80px}}