:root{color-scheme:light;--bg:#f6f7f9;--paper:#fff;--ink:#1d2939;--muted:#526175;--line:#d4dde7;--accent:#175cd3;--soft:#eaf2ff;--wall:#344054;--closed:#c8e4f3;--open:#ffe5a3;--current:#ffb26b;--path:#166fe5}*{box-sizing:border-box}[hidden]{display:none!important}input[type="number"]{min-height:44px;max-width:180px;padding:.5rem .75rem;border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--ink)}.mode-tabs{display:flex;gap:10px;margin-bottom:20px}.mode-tabs button{padding:14px 20px;text-align:left;flex:1;font-size:1.05rem}.mode-tabs button span{display:block;color:var(--muted);font-size:.8rem;font-weight:400;margin-top:3px}.mode-tabs [aria-pressed="true"]{border-color:var(--accent);background:var(--soft);color:var(--accent)}.sampling-settings{display:flex;flex-wrap:wrap;gap:14px 22px;padding:18px 20px;background:var(--paper);border:1px solid var(--line);border-top:0}.sampling-settings>p{flex-basis:100%;margin:0;color:var(--muted);font-size:.82rem}.boards.sampling-boards{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.sampling-boards .board header{min-height:96px}.sampling-boards .current{min-height:86px}.tree-key{background:#237b70}.sample-key{background:#d45a12}.rewire-key{background:#9c36b5}.sampling-reading{padding-top:40px}.sampling-reading>h2{font-size:2rem;line-height:1.3;letter-spacing:-0.03em}.sampling-explain{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin:28px 0}.sampling-explain article{padding:22px;border:1px solid var(--line);background:var(--paper);border-radius:10px}.sampling-explain h3{font-size:1.15rem;line-height:1.45}.sampling-explain p,.references{color:var(--muted);font-size:.93rem}@media(max-width:1000px){.boards.sampling-boards,.sampling-explain{grid-template-columns:1fr}.sampling-boards .current{min-height:50px}.sampling-boards .board header{min-height:0}}@media(max-width:540px){.mode-tabs{flex-direction:column}.sampling-settings{padding:14px}.sampling-settings input{width:100%;max-width:none}.sampling-reading>h2{font-size:1.6rem}}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--accent);text-underline-offset:4px}button,input,select{font:inherit}button,select{min-height:44px;border:1px solid var(--line);border-radius:7px;padding:.55rem .85rem;background:var(--paper);color:var(--ink)}button{cursor:pointer;font-weight:600}button:hover{background:var(--soft);border-color:var(--accent)}button:disabled{opacity:.55;cursor:default}:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.skip{position:absolute;left:1rem;top:-100px;padding:.7rem;background:var(--paper);z-index:2}.skip:focus{top:8px}.sitebar{padding:1rem max(24px,calc((100vw - 1400px) / 2));display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid var(--line);background:var(--paper)}.sitebar a{text-decoration:none}.brand{font-weight:800;color:var(--ink);letter-spacing:-0.6px;font-size:1.18rem}.brand span{font-weight:400;color:var(--muted)}main{max-width:1456px;margin:auto;padding:24px 28px 48px}.breadcrumb{display:flex;flex-wrap:wrap;gap:.6rem;font-size:.85rem;color:var(--muted)}.intro{display:grid;grid-template-columns:1fr 300px;gap:4rem;align-items:center;padding:38px 0 34px}.eyebrow,.note-number,.algo-tag{font-size:.73rem;letter-spacing:.11em;font-weight:750;color:var(--accent)}h1{font-size:clamp(2rem,3.8vw,3.5rem);line-height:1.12;letter-spacing:-0.04em;margin:.7rem 0 1.2rem}.lead{max-width:760px;color:var(--muted);font-size:1.08rem;margin:0}.intro-note{border-left:2px solid var(--accent);padding-left:24px}.intro-note p{font-size:1.25rem;line-height:1.5;font-weight:600}.intro-note a{font-size:.9rem}.toolbar{display:flex;flex-wrap:wrap;gap:14px 20px;padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:10px 10px 0 0;align-items:end}.field{display:flex;flex-direction:column;gap:5px}.field label{font-size:.85rem;font-weight:650}.field select{max-width:100%}.speed{min-width:190px;flex:1}input[type="range"]{width:100%;height:44px;margin:0;accent-color:var(--accent)}.editbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding:16px 20px;background:var(--paper);border:1px solid var(--line);border-top:0}.tool-label{font-size:.85rem;font-weight:650}.tools{display:flex;flex-wrap:wrap;gap:6px}.tools [aria-pressed="true"]{color:var(--accent);background:var(--soft);border-color:var(--accent)}.quiet{background:transparent;font-weight:500}.hint{font-size:.85rem;color:var(--muted);margin:12px 0}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:18px 0}.primary{background:var(--accent);color:white;border-color:var(--accent)}.primary:hover{background:#124bad;color:white}#status{font-size:.85rem;color:var(--muted);flex:1 1 260px;padding-left:8px}
.boards{display:grid;grid-template-columns:1fr 1fr;gap:18px}.board{min-width:0;border:1px solid var(--line);background:var(--paper);border-radius:10px;overflow:hidden}.board header{padding:16px 20px 12px;display:flex;align-items:center;justify-content:space-between;gap:10px}.board h2{font-size:1.7rem;line-height:1.2;margin:3px 0;letter-spacing:-0.03em}.board header p{font-size:1.06rem;margin:0;color:var(--muted)}var{font-family:"Cambria Math","STIX Two Math",serif;font-style:italic}canvas{width:100%;display:block;aspect-ratio:33/21;background:#fff;touch-action:none;cursor:crosshair}.metrics{margin:0;padding:14px 18px;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);gap:10px}.metrics dt{font-size:.74rem;color:var(--muted)}.metrics dd{font-size:1.42rem;font-weight:700;margin:2px 0 0;font-variant-numeric:tabular-nums}.current{font-size:.8rem;margin:0;padding:0 18px 14px;color:var(--muted);min-height:40px}.legend{display:flex;flex-wrap:wrap;gap:10px 22px;margin:20px 0;font-size:.8rem}.legend span{display:flex;align-items:center;gap:7px}.legend i{display:inline-block;width:13px;height:13px;border-radius:2px}.wall{background:var(--wall)}.closed{background:var(--closed)}.open{background:var(--open)}.current-cell{background:var(--current)}.path{background:var(--path)}.start-key{color:#087443}.goal-key{color:#b4235c}.result{padding:18px 22px;background:var(--soft);border-left:3px solid var(--accent);margin:24px 0;font-weight:550}.queue{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;font-size:.9rem}summary{cursor:pointer;font-weight:650}.queue-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px}.queue h3{font-size:1rem}.queue li{font-variant-numeric:tabular-nums}.queue p{color:var(--muted)}.reading{display:grid;grid-template-columns:1fr 1fr;gap:6%;padding:55px 0 25px}.reading h2{font-size:2rem;line-height:1.25;letter-spacing:-0.03em;margin:.8rem 0 1.2rem}.reading-card{background:var(--paper);padding:25px 30px;border:1px solid var(--line);border-radius:10px;align-self:start}h3{margin:0 0 .8rem}.reading p,.practice p{color:var(--muted)}.practice{max-width:960px;padding:10px 0 24px}.practice li{margin:1rem 0;padding-left:6px}.model-note{padding:20px 24px;border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:.92rem}footer{border-top:1px solid var(--line);margin-top:40px;padding-top:20px;color:var(--muted);font-size:.82rem}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media(max-width:900px){.intro{grid-template-columns:1fr;gap:24px}.intro-note{display:none}.boards{grid-template-columns:1fr}.reading{grid-template-columns:1fr;gap:24px}.board header p{font-size:1rem}}@media(max-width:540px){main{padding:18px 14px 32px}.sitebar{padding:14px}.brand span{display:none}.sitebar>a:last-child{font-size:.82rem}.intro{padding:26px 0}.toolbar{padding:14px}.field{width:100%}.field select{width:100%}.editbar{padding:14px}.tools{display:grid;grid-template-columns:1fr 1fr;width:100%}.tools button{font-size:.9rem}.controls button{flex:1 1 43%;font-size:.9rem}#status{padding:4px 0}.board header{padding:14px}.algo-tag{font-size:.62rem}.metrics{gap:5px;padding:12px}.metrics dt{font-size:.67rem}.metrics dd{font-size:1.2rem}.queue-columns{grid-template-columns:1fr}.reading-card{padding:20px}}