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.heat-cell[data-l="2"]{background:#286d3b;border-color:#2f7e45}[data-theme=dark] .heat-cell[data-l="3"]{background:#3fa05a;border-color:#45b065}[data-theme=dark] .heat-cell[data-l="4"]{background:#60d37e;border-color:#6cdd88}.heatmap-legend{color:var(--fg-dim);justify-content:flex-end;align-items:center;gap:6px;margin-top:12px;font-size:11px;display:flex}.heatmap-legend .heat-cell{cursor:default}.notes-page-list{flex-direction:column;gap:10px;display:flex}.notes-group{margin-bottom:24px}.notes-group-head{text-transform:uppercase;letter-spacing:.12em;color:var(--fg-dim);border-bottom:1px solid var(--border);margin-bottom:10px;padding-bottom:8px;font-size:11.5px;font-weight:600}.notes-page-empty{text-align:center;color:var(--fg-dim);padding:60px 20px;font-size:14px}.nav-link{color:var(--fg-muted);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:8px;width:100%;margin-bottom:2px;padding:10px 12px;font-size:13.5px;text-decoration:none;transition:all .15s;display:block}.nav-link:hover{background:var(--bg-soft);color:var(--fg);text-decoration:none}.nav-link.active{background:var(--brand-soft);color:var(--brand-fg);font-weight:600}.menu-btn{display:none}@media (max-width:900px){.app{grid-template-columns:1fr}.sidebar{z-index:40;width:88%;max-width:320px;box-shadow:var(--shadow-md);transition:transform .25s;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main{padding:24px 20px 60px}.menu-btn{z-index:50;background:var(--brand);color:#fff;width:52px;height:52px;box-shadow:var(--shadow-md);border:none;border-radius:50%;justify-content:center;align-items:center;font-size:22px;display:inline-flex;position:fixed;bottom:20px;right:20px}.backdrop{z-index:35;background:#0006;display:none;position:fixed;inset:0}.backdrop.show{display:block}.home-title{font-size:32px}.chapter-header h1{font-size:26px}.section-head h2{font-size:19px}.chapter-nav-btn{max-width:47%}.book-btn{width:44px;height:44px;bottom:22px;right:82px}.notebook-drawer{width:100vw;max-width:none}}