*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--black:#000;--near:#111;--white:#fff;--bg:#fff;--bg-subtle:#f8f8f8;--border:#e0e0e0;--border-strong:#000;--text:#111;--muted:#666;--faint:#999;--font:"Inter", system-ui, -apple-system, sans-serif;--mono:"JetBrains Mono", "Courier New", monospace}html{font-size:15px}body{font-family:var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.65}.app{flex-direction:column;min-height:100vh;display:flex}.topbar{border-bottom:1px solid var(--black);z-index:50;background:var(--white);justify-content:space-between;align-items:center;height:52px;padding:0 2rem;display:flex;position:sticky;top:0}.topbar h1{letter-spacing:.08em;text-transform:uppercase;font-size:.8rem;font-weight:700}.topbar span{color:var(--muted);font-size:.75rem}.tabs{border-bottom:1px solid var(--border);background:var(--white);padding:0 2rem;display:flex;overflow-x:auto}.tab-btn{font:600 .8rem var(--font);letter-spacing:.03em;color:var(--muted);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:.6rem 1.1rem}.tab-btn.active{color:var(--black);border-bottom-color:var(--black)}.layout{flex:1;display:flex}.sidebar{border-right:1px solid var(--border);flex-shrink:0;width:210px;height:calc(100vh - 52px);padding:1.25rem 0;position:sticky;top:52px;overflow-y:auto}.sidebar-group{font:700 .65rem var(--font);letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding:.9rem 1.2rem .3rem}.sidebar a{color:var(--muted);border-left:2px solid #0000;padding:.28rem 1.2rem;font-size:.78rem;text-decoration:none;display:block}.sidebar a:hover{color:var(--black)}.sidebar a.active{color:var(--black);border-left-color:var(--black);font-weight:600}.content{flex:1;min-width:0;max-width:900px;padding:2.5rem 3rem}.q{margin-bottom:4rem;scroll-margin-top:72px}.q-hd{border-bottom:1px solid var(--black);align-items:baseline;gap:.75rem;margin-bottom:1.6rem;padding-bottom:.75rem;display:flex}.q-title{font-size:1rem;font-weight:700}.q-marks{letter-spacing:.07em;text-transform:uppercase;color:var(--muted);border:1px solid var(--border);padding:.1rem .4rem;font-size:.68rem;font-weight:700}.part{margin:1.6rem 0}.part-lbl{letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-bottom:.75rem;font-size:.72rem;font-weight:700}.sol{border-left:3px solid var(--black);background:var(--bg-subtle);margin:.75rem 0;padding:.85rem 1rem}.sol>.lbl{font:700 .62rem var(--font);letter-spacing:.12em;text-transform:uppercase;color:var(--black);margin-bottom:.4rem;display:block}.expl{border-left:2px solid var(--border);margin:.75rem 0;padding:.75rem 1rem;font-size:.88rem}.expl>.lbl{font:700 .62rem var(--font);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:.35rem;display:block}.ctx{border:1px solid var(--border);color:var(--muted);margin:.75rem 0;padding:.75rem 1rem;font-size:.86rem}.ctx>.lbl{font:700 .62rem var(--font);letter-spacing:.12em;text-transform:uppercase;color:var(--faint);margin-bottom:.3rem;display:block}.sw-controls{align-items:center;gap:.75rem;margin-bottom:.85rem;display:flex}.sw-btn{border:1px solid var(--black);font:600 .75rem var(--font);cursor:pointer;background:0 0;padding:.28rem .7rem}.sw-btn:hover:not(:disabled){background:var(--near);color:var(--white)}.sw-btn:disabled{opacity:.25;cursor:default}.sw-count{font:600 .75rem var(--font);letter-spacing:.05em;color:var(--muted);text-align:center;min-width:68px}.sw-desc{margin-bottom:.6rem;font-size:.85rem;font-weight:500}.sw-action{font:700 .68rem var(--font);letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--black);margin-bottom:.6rem;padding:.12rem .45rem;display:inline-block}.tree-wrap{margin:.5rem 0;overflow-x:auto}svg.tree{display:block}.btree-wrap,.t-wrap{margin:.75rem 0;overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.82rem}th,td{border:1px solid var(--border);text-align:left;padding:.38rem .65rem}th{background:var(--near);color:var(--white);font:600 .72rem var(--font);letter-spacing:.05em;text-transform:uppercase}td.center{text-align:center}td.occ{background:var(--bg-subtle);font-weight:600}td.empty{color:var(--faint);text-align:center}td.strong{font-weight:600}tr.highlight td{background:var(--bg-subtle);font-weight:600}pre.code{color:#e8e8e8;font:400 .79rem/1.7 var(--mono);background:#111;margin:.75rem 0;padding:1.1rem 1.3rem;overflow-x:auto}.c{color:#555}.k{color:#ccc;font-weight:600}.hg{flex-wrap:wrap;gap:2px;margin:.75rem 0;display:flex}.hg-cell{border:1px solid var(--near);text-align:center;min-width:50px}.hg-idx{font:500 .6rem var(--font);color:var(--faint);background:var(--bg-subtle);border-bottom:1px solid var(--border);padding:2px}.hg-val{min-height:34px;font:600 .78rem var(--mono);justify-content:center;align-items:center;padding:6px 4px;display:flex}.hg-cell.hg-occ .hg-val{background:var(--near);color:var(--white)}.hg-cell.hg-chain .hg-val{font-size:.72rem}.bloom{flex-wrap:wrap;gap:3px;margin:.75rem 0;display:flex}.bl-bit{border:1px solid var(--near);flex-direction:column;justify-content:center;align-items:center;width:40px;height:44px;display:flex}.bl-bit .bl-i{font:400 .58rem var(--font);color:var(--faint)}.bl-bit .bl-v{font:700 .85rem var(--mono)}.bl-bit.on{background:var(--near);color:var(--white)}.bl-bit.on .bl-i{color:#888}p{margin:.5rem 0;font-size:.88rem}ul,ol{margin:.5rem 0;padding-left:1.3rem;font-size:.88rem}li{margin:.2rem 0}strong{font-weight:600}.mono{font-family:var(--mono)}.muted{color:var(--muted)}.tiny{color:var(--muted);margin:.3rem 0;font-size:.75rem}.rot-grid{grid-template-columns:1fr 36px 1fr;align-items:center;gap:.75rem;margin:.75rem 0;display:grid}.rot-arr{text-align:center;font-size:1.3rem}.two-col{grid-template-columns:1fr 1fr;gap:1.5rem;margin:.75rem 0;display:grid}@media (width<=768px){.topbar,.tabs{padding:0 1rem}.sidebar{display:none}.content{padding:1.5rem 1rem}.rot-grid,.two-col{grid-template-columns:1fr}}