:root{--bg:#0f1115;--bg-elevated:#171a21;--bg-elevated-2:#1e222b;--border:#2a2f3a;--text:#e6e8ec;--text-dim:#9aa2b1;--accent:#2dd4bf;--accent-dim:#14b8a6;--accent-contrast:#06201c;--danger:#f87171;--danger-bg:#3a1616;--success:#34d399;--success-bg:#123527;--radius:10px;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body{background:var(--bg);min-height:100%;color:var(--text);margin:0;font-family:SF Mono,ui-monospace,Cascadia Code,Menlo,monospace,system-ui,sans-serif}#app{flex-direction:column;min-height:100vh;display:flex}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.layout{flex:1;align-items:stretch;min-height:0;display:flex}.sidebar{background:var(--bg-elevated);border-right:1px solid var(--border);flex-shrink:0;width:260px;padding:1rem .75rem;overflow-y:auto}.brand{color:var(--text);border-bottom:1px solid var(--border);align-items:center;gap:.5rem;margin-bottom:.75rem;padding:.5rem .5rem 1rem;font-size:.95rem;font-weight:700;display:flex}.brand:hover{color:var(--accent);text-decoration:none}.brand-mark{color:var(--accent)}.sidebar-list{flex-direction:column;gap:.15rem;display:flex}.sidebar-item{border-radius:var(--radius);color:var(--text-dim);align-items:center;gap:.5rem;padding:.4rem .5rem;font-size:.8rem;display:flex}.sidebar-item:hover{background:var(--bg-elevated-2);color:var(--text);text-decoration:none}.sidebar-item.active{background:var(--bg-elevated-2);color:var(--accent)}.sidebar-index{color:var(--text-dim);font-variant-numeric:tabular-nums;flex-shrink:0;width:1.25rem}.sidebar-name{white-space:nowrap;text-overflow:ellipsis;flex:1;overflow:hidden}.sidebar-progress{color:var(--accent);font-variant-numeric:tabular-nums;font-size:.7rem}.sidebar-progress--stub{color:var(--text-dim)}.content{flex:1;min-width:0;padding:1.75rem 2rem;overflow-y:auto}.content h1{margin-top:0;font-size:1.6rem}.lead{color:var(--text-dim);max-width:62ch;line-height:1.5}.overall-progress{color:var(--accent)}.breadcrumb{color:var(--text-dim);margin-bottom:1rem;font-size:.85rem}.coming-soon{color:var(--text-dim);font-style:italic}.pattern-grid,.subpattern-list,.problem-list{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.85rem;margin-top:1.25rem;display:grid}.pattern-card,.subpattern-card,.problem-card{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);padding:1rem;transition:border-color .15s,transform .15s;display:block}.pattern-card:hover,.subpattern-card:hover,.problem-card:hover{border-color:var(--accent-dim);text-decoration:none;transform:translateY(-1px)}.pattern-card--stub{opacity:.7}.pattern-card h3,.subpattern-card h3,.problem-card h3{color:var(--text);margin:0 0 .4rem;font-size:.95rem}.pattern-card p,.subpattern-card p{color:var(--text-dim);margin:0 0 .6rem;font-size:.8rem;line-height:1.4}.badge{background:var(--bg-elevated-2);color:var(--accent);border:1px solid var(--border);border-radius:999px;padding:.15rem .5rem;font-size:.7rem;display:inline-block}.badge--easy{color:var(--success)}.badge--medium{color:#fbbf24}.badge--hard{color:var(--danger)}.solved-check{color:var(--success);font-size:.85rem;font-weight:400}.sysdes-diagram-wrap{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);margin:1.25rem 0 1.5rem;padding:1rem}.sysdes-diagram-caption{color:var(--text-dim);margin:0 0 .6rem;font-size:.78rem}.sysdes-diagram{width:100%;height:auto;display:block}.sysdes-diagram-box rect{fill:var(--bg-elevated-2);stroke:var(--border);stroke-width:1px;transition:stroke .15s,fill .15s}.sysdes-diagram-box:hover rect{stroke:var(--accent);fill:var(--bg-elevated)}.sysdes-diagram-box text{fill:var(--text);font-family:inherit;font-size:12px}.sysdes-diagram-box .sysdes-diagram-sub{fill:var(--text-dim);font-size:9.5px}.sysdes-diagram-box:hover text{fill:var(--accent)}.sysdes-diagram-edge{stroke:var(--border);stroke-width:1.5px;fill:none}.sysdes-diagram-arrowhead{fill:var(--border)}.description p{color:var(--text-dim);white-space:pre-wrap;max-width:72ch;line-height:1.55}.code-editor{color:#d1f7f0;border:1px solid var(--border);border-radius:var(--radius);resize:vertical;tab-size:2;background:#0b0d11;width:100%;min-height:200px;padding:.85rem;font-family:SF Mono,ui-monospace,Menlo,monospace;font-size:.85rem;line-height:1.5}.code-editor:focus{border-color:var(--accent);outline:none}.editor-actions{gap:.6rem;margin:.85rem 0;display:flex}button{cursor:pointer;font-family:inherit}.primary-btn{background:var(--accent);color:var(--accent-contrast);border-radius:var(--radius);border:none;padding:.5rem 1rem;font-size:.85rem;font-weight:700}.primary-btn:hover{background:var(--accent-dim)}.secondary-btn{color:var(--text);border:1px solid var(--border);border-radius:var(--radius);background:0 0;padding:.5rem 1rem;font-size:.85rem}.secondary-btn:hover{border-color:var(--accent-dim);color:var(--accent)}.solution-reveal{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);margin:.85rem 0;padding:1rem}.solution-reveal pre{white-space:pre-wrap;color:#d1f7f0;margin:0;font-size:.82rem}.solutions-list{flex-direction:column;gap:1rem;display:flex}.solution-approach{border-top:1px solid var(--border);padding-top:.85rem}.solution-approach:first-child{border-top:none;padding-top:0}.solution-approach h4{color:var(--accent);margin:0 0 .3rem;font-size:.95rem}.solution-complexity{color:var(--text-dim,#9aa);margin:0 0 .4rem;font-size:.82rem}.solution-explanation{margin:0 0 .5rem;font-size:.85rem;line-height:1.45}.solution-code-block{white-space:pre-wrap;color:#d1f7f0;margin:0;font-size:.8rem}.run-summary{border-radius:var(--radius);margin-top:1rem;padding:.6rem .85rem;font-size:.85rem;font-weight:600}.run-summary--pass{background:var(--success-bg);color:var(--success)}.run-summary--fail{background:var(--danger-bg);color:var(--danger)}.test-case-list{flex-direction:column;gap:.5rem;margin-top:.75rem;display:flex}.test-case{border-radius:var(--radius);border:1px solid var(--border);grid-template-columns:auto 1fr 1fr 1fr;align-items:start;gap:.6rem;padding:.5rem .75rem;font-size:.78rem;display:grid}.test-case--pass{border-left:3px solid var(--success)}.test-case--fail{border-left:3px solid var(--danger)}.test-case-label{white-space:nowrap;font-weight:700}.test-case--pass .test-case-label{color:var(--success)}.test-case--fail .test-case-label{color:var(--danger)}.test-case-field{color:var(--text-dim);word-break:break-word}.test-case-field strong{color:var(--text)}.buddy-panel{background:var(--bg-elevated);border-left:1px solid var(--border);flex-direction:column;flex-shrink:0;gap:.6rem;width:260px;padding:1.25rem 1rem;display:flex}.buddy-panel h2{margin:0;font-size:1rem}.buddy-stub-note{color:var(--text-dim);background:var(--bg-elevated-2);border:1px dashed var(--border);border-radius:var(--radius);padding:.6rem;font-size:.78rem;line-height:1.4}#buddy-form{gap:.4rem;display:flex}#buddy-input{border:1px solid var(--border);border-radius:var(--radius);min-width:0;color:var(--text);background:#0b0d11;flex:1;padding:.4rem .6rem;font-size:.8rem}#buddy-input:focus{border-color:var(--accent);outline:none}.buddy-response{color:var(--text-dim);white-space:pre-wrap;font-size:.78rem;line-height:1.4}.buddy-response--error{color:var(--danger)}.buddy-rag-toggle{color:var(--text-dim);align-items:center;gap:.4rem;font-size:.72rem;display:flex}.buddy-rag-toggle input[type=checkbox]{accent-color:var(--accent)}.ingest-title-input{border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);background:#0b0d11;margin-bottom:.6rem;padding:.5rem .7rem;font-size:.85rem}.ingest-title-input:focus{border-color:var(--accent);outline:none}.brain-chunk-list{flex-direction:column;gap:.5rem;margin-top:.75rem;display:flex}.brain-chunk{border-radius:var(--radius);border:1px solid var(--border);color:var(--text-dim);padding:.5rem .75rem;font-size:.78rem;line-height:1.4}.brain-chunk strong{color:var(--text)}.app-footer{border-top:1px solid var(--border);background:var(--bg-elevated);color:var(--text-dim);flex-shrink:0;align-items:center;gap:1rem;padding:.5rem 1rem;font-size:.72rem;display:flex}.link-btn{color:var(--accent);background:0 0;border:none;padding:0;font-size:.72rem}.link-btn:hover{text-decoration:underline}.sidebar-section-label{letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin:1rem 0 .35rem;padding:0 .5rem;font-size:.66rem}.concept-groups{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem;margin-top:1.25rem;display:grid}.concept-group{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.1rem .6rem}.concept-group-title{color:var(--accent);border-bottom:1px solid var(--border);margin:0 0 .6rem;padding-bottom:.5rem;font-size:.95rem}.concept-item-list{flex-direction:column;display:flex}.concept-item{border-bottom:1px solid #ffffff0a;flex-direction:column;gap:.05rem;padding:.4rem 0;display:flex}.concept-item:last-child{border-bottom:none}.concept-term{color:var(--text);font-size:.82rem;font-weight:600}.concept-def{color:var(--text-dim);font-size:.76rem}.ref-item-list{flex-direction:column;display:flex}.ref-item{border-bottom:1px solid #ffffff0a;padding:.5rem 0}.ref-item:last-child{border-bottom:none}.ref-item-head{justify-content:space-between;align-items:baseline;gap:.5rem;display:flex}.ref-item-name{color:var(--text);font-size:.82rem;font-weight:600;font-family:var(--font-mono,monospace)}.ref-level-badge{letter-spacing:.03em;text-transform:uppercase;border:1px solid #0000;border-radius:999px;flex-shrink:0;padding:.1rem .4rem;font-size:.62rem}.ref-level-badge--beginner{color:#8ee6b0;border-color:#8ee6b0}.ref-level-badge--intermediate{color:#f5d67a;border-color:#f5d67a}.ref-level-badge--advanced{color:#f28b82;border-color:#f28b82}.ref-item-summary{color:var(--text-dim);margin:.25rem 0 0;font-size:.76rem}.ref-item-example{color:#d1f7f0;white-space:pre-wrap;margin-top:.3rem;font-size:.72rem;display:block}.concept-term--linked{cursor:pointer;text-decoration:none}.concept-term--linked:hover{color:var(--accent)}.deepdive-strategy-list{flex-direction:column;gap:1rem;margin-top:1.25rem;display:flex}.deepdive-strategy{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.1rem}.deepdive-strategy-name{color:var(--accent);margin:0 0 .4rem;font-size:.95rem}.deepdive-strategy-desc{color:var(--text-dim);margin:0 0 .75rem;font-size:.8rem}.deepdive-panels{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:.75rem;display:grid}.deepdive-panel{background:var(--bg-elevated-2);border:1px solid var(--border);border-radius:var(--radius);min-width:0;padding:.6rem .7rem}.deepdive-panel-label{letter-spacing:.05em;text-transform:uppercase;color:var(--text-dim);margin-bottom:.4rem;font-size:.66rem;display:block}.deepdive-diagram,.deepdive-code{white-space:pre;font-size:.72rem;line-height:1.45;font-family:var(--font-mono,monospace);margin:0;overflow-x:auto}.deepdive-diagram{color:#d1f7f0}.deepdive-code{color:var(--text)}.deepdive-practice-cta{background:var(--accent);color:var(--accent-contrast);border-radius:var(--radius);margin:.9rem 0 .25rem;padding:.5rem .9rem;font-size:.82rem;font-weight:700;text-decoration:none;display:inline-block}.deepdive-practice-cta:hover{background:var(--accent-dim)}.strategy-diagram-wrap{flex-direction:column;gap:.5rem;display:flex}.strategy-diagram{width:100%;height:auto;display:block}.strategy-diagram-caption{color:var(--text-dim);margin:0;font-size:.72rem;line-height:1.4}.sd-box{fill:var(--bg-elevated-2);stroke:var(--border);stroke-width:1px}.sd-box-dim{fill:var(--bg-elevated);stroke:var(--border);stroke-width:1px;stroke-dasharray:3 2}.sd-overlap{fill:var(--accent);opacity:.22;stroke:var(--accent);stroke-width:1px}.sd-window{fill:var(--accent);opacity:.12;stroke:var(--accent);stroke-width:1px}.sd-timeline{stroke:var(--border);stroke-width:1.5px}.sd-line{fill:none;stroke:var(--accent);stroke-width:2px}.sd-divider{stroke:var(--border);stroke-width:1px}.sd-dot{fill:var(--accent)}.sd-warn-dot{fill:var(--danger)}.sd-warn-label{fill:var(--danger);font-family:inherit;font-size:9px}.sd-label{fill:var(--text-dim);font-family:inherit;font-size:9.5px}.sd-note{fill:var(--text-dim);font-family:inherit;font-size:9px}.sd-note-warn{fill:var(--danger);font-family:inherit;font-size:9px}.sd-bucket{fill:var(--bg-elevated-2);stroke:var(--accent);stroke-width:1.5px}.sd-token{fill:var(--accent)}.sd-token-empty{fill:none;stroke:var(--border);stroke-width:1px;stroke-dasharray:2 1.5}.sd-arrow-line{stroke:var(--border);stroke-width:1.5px}.sd-arrowhead{fill:var(--border)}