:root{--paper: #eef0ec;--card: #f7f8f5;--ink: #17201b;--mute: #4f5a53;--line: #cfd6cf;--felt: #17271f;--felt-2: #22352b;--felt-ink: #eef0ec;--felt-mute: #b5c6ba;--green: #0e5a3a;--green-2: #dcebe2;--brass: #e7cf9f;--sq-l: #ecd6b0;--sq-d: #b07f55;--hl: rgba(14, 90, 58, .34);--sel: rgba(231, 207, 159, .75);--ar: rgba(14, 90, 58, .86);--ar2: rgba(23, 32, 27, .38);--hint: rgba(214, 120, 30, .9);--good: #1f7a46;--bad: #a3361f;--ui: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;--text: "Source Serif 4", Georgia, "Times New Roman", serif;--r: 8px;color-scheme:light}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.65 var(--text);font-optical-sizing:auto}img,svg{max-width:100%}a{color:var(--green);text-decoration-thickness:1px;text-underline-offset:2px}a:hover{text-decoration-thickness:2px}:focus-visible{outline:3px solid #d6781e;outline-offset:2px;border-radius:3px}.skip{position:absolute;clip-path:inset(50%);width:1px;height:1px;overflow:hidden}.skip:focus{clip-path:none;width:auto;height:auto;inset-inline-start:12px;top:8px;z-index:50;background:#fff;padding:8px 12px}.wrap{max-width:1200px;margin-inline:auto;padding-inline:16px}@media(min-width:760px){.wrap{padding-inline:32px}}header.site{border-bottom:1px solid var(--line);background:var(--paper)}header.site .bar{display:flex;align-items:center;gap:12px 24px;min-height:58px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:10px;font:700 1.08rem/1 var(--ui);color:var(--ink);text-decoration:none;margin-inline-end:auto;letter-spacing:-.01em}.brand svg{flex:none}nav.main{display:flex;gap:4px 18px;font:500 .97rem/1 var(--ui);overflow-x:auto;scrollbar-width:none}nav.main a{color:var(--ink);text-decoration:none;padding:8px 2px;white-space:nowrap;border-bottom:2px solid transparent}nav.main a[aria-current]{border-bottom-color:var(--green)}@media(max-width:759px){header.site .bar{padding-block:8px}nav.main{width:100%;gap:8px;justify-content:space-between;font-size:.9rem}}@media(max-width:380px){nav.main{font-size:.82rem;gap:4px}}.crumbs{font:400 .9rem/1.4 var(--ui);color:var(--mute);padding-block:14px 6px}.crumbs a{color:var(--mute)}h1,h2,h3,h4{font-family:var(--ui);color:var(--ink);letter-spacing:-.015em}h1{font-size:clamp(1.9rem,1.2rem + 2.4vw,2.6rem);line-height:1.08;font-weight:750;margin:0 0 .45em}h2{font-size:clamp(1.35rem,1.1rem + .8vw,1.6rem);line-height:1.2;font-weight:700;margin:2.2em 0 .5em}h3{font-size:1.12rem;line-height:1.3;font-weight:700;margin:1.6em 0 .35em}p{margin:0 0 1em}.lead{font-size:1.18rem;line-height:1.55}.small{font-size:.9rem;color:var(--mute)}.ui{font-family:var(--ui)}.prose{max-width:42rem}ul.tight{padding-inline-start:1.15em;margin:0 0 1em}ul.tight li{margin:.3em 0}.num{font-variant-numeric:tabular-nums}.san{font-family:var(--ui);font-weight:650}.felt{background:var(--felt);color:var(--felt-ink)}.felt a{color:var(--brass)}.felt .lead{color:#dfe7e1}.felt h1{color:#fff}.stage{display:grid;gap:20px 40px;padding-block:18px 26px}@media(min-width:960px){.stage{grid-template-columns:minmax(0,560px) minmax(0,1fr);align-items:start;padding-block:28px 34px}}.stage .side{min-width:0}.olp{position:relative;outline:none}.olp .boardbox{position:relative;aspect-ratio:1;border-radius:6px;overflow:hidden;box-shadow:0 0 0 6px var(--felt-2);background:var(--sq-d);touch-action:pan-y}svg.board{display:block;width:100%;height:100%;user-select:none;-webkit-user-select:none}svg.board .l{fill:var(--sq-l)}svg.board .d{fill:var(--sq-d)}svg.board .hl{fill:var(--hl)}svg.board .sel{fill:var(--sel)}svg.board .ar{fill:var(--ar)}svg.board .ar2{fill:var(--ar2)}svg.board .hint{fill:var(--hint)}svg.board .c{font:700 7.5px var(--ui);pointer-events:none}svg.board .cl{fill:var(--sq-l)}svg.board .cd{fill:var(--sq-d)}svg.board use.pc{will-change:transform}.olp.drilling svg.board{cursor:pointer}.olp.nope .boardbox{animation:nope .32s}@keyframes nope{25%{transform:translate(-5px)}75%{transform:translate(5px)}}@media(prefers-reduced-motion:reduce){.olp.nope .boardbox{animation:none;outline:3px solid var(--bad)}}.ctl{display:grid;grid-template-columns:repeat(4,1fr) 1.6fr repeat(2,1fr);gap:6px;margin-top:14px}.ctl button,.btn{font:600 1rem/1 var(--ui);min-height:44px;border-radius:var(--r);border:1px solid transparent;cursor:pointer}.felt .ctl button{background:var(--felt-2);color:var(--felt-ink);border-color:#2f4639}.felt .ctl button:hover{background:#2b4236}.ctl button[data-a=play]{background:var(--brass)!important;color:var(--felt)!important;border-color:var(--brass)!important}.ctl button svg{width:18px;height:18px;vertical-align:-3px;fill:currentColor}.ctl button[data-a=play] .pause{display:none}.ctl button[data-a=play][data-on="1"] .pause{display:inline}.ctl button[data-a=play][data-on="1"] .playi{display:none}.scrub{width:100%;margin:12px 0 2px;accent-color:var(--brass)}.mv-list{display:flex;flex-wrap:wrap;gap:2px 1px;margin-top:8px;font:600 1rem/1.4 var(--ui);font-variant-numeric:tabular-nums;max-height:9.5em;overflow-y:auto}.mv-list button{font:inherit;background:none;border:0;color:var(--felt-ink);padding:4px 6px;border-radius:5px;cursor:pointer;min-height:32px}.mv-list button .n{color:var(--felt-mute);font-weight:500;margin-inline-end:2px}.mv-list button[aria-current]{background:var(--brass);color:var(--felt)}.mv-list button[aria-current] .n{color:var(--felt)}.mv-list .new{text-decoration:underline;text-decoration-color:#e7cf9f8c;text-underline-offset:4px}.mv-cap{font:400 .98rem/1.5 var(--ui);color:#dfe7e1;margin-top:8px;min-height:3em}.mv-cap b{color:#fff;margin-inline-end:4px}.drillbar{display:none;gap:8px;align-items:center;flex-wrap:wrap;margin-top:10px;font:500 .98rem/1.4 var(--ui)}.olp.drilling .drillbar{display:flex}.olp.drilling .ctl,.olp.drilling .scrub{display:none}.drill-msg{flex:1 1 100%;min-height:1.4em;color:#fff}.felt .btn{background:var(--felt-2);color:var(--felt-ink);border-color:#2f4639;padding:0 14px}.btn.primary,.felt .btn.primary{background:var(--brass);color:var(--felt);border-color:var(--brass)}.sr-live{position:absolute;clip-path:inset(50%);width:1px;height:1px;overflow:hidden}.facts{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px;margin:18px 0 0;font:400 .98rem/1.45 var(--ui)}.facts dt{color:var(--felt-mute)}.facts dd{margin:0;font-weight:600;color:#fff;font-variant-numeric:tabular-nums}.paper .facts dt{color:var(--mute)}.paper .facts dd{color:var(--ink)}.evalbar{display:flex;height:8px;border-radius:4px;overflow:hidden;margin-top:6px;background:#0b130f;max-width:240px}.evalbar i{background:#f4f1e8}.cols{display:grid;gap:4px 36px}@media(min-width:760px){.cols.two{grid-template-columns:1fr 1fr}}.box{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px}.panel{border-inline-start:4px solid var(--green);padding:2px 0 2px 16px;margin:1em 0}.table{width:100%;border-collapse:collapse;font:400 .97rem/1.45 var(--ui);font-variant-numeric:tabular-nums}.table th,.table td{text-align:start;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}.table th{font-weight:600;color:var(--mute)}.table td.r,.table th.r{text-align:end}.scroll-x{overflow-x:auto}.bars{display:grid;gap:6px;font:400 .95rem/1.3 var(--ui)}.bars .row{display:grid;grid-template-columns:7.5em 1fr 4.5em;gap:10px;align-items:center}.bars .bar{height:12px;border-radius:3px;background:#2a2f2c;overflow:hidden;display:flex}.bars .bar .w{background:#f2efe6}.bars .bar .dr{background:#9aa39d}.chip{display:inline-block;font:600 .82rem/1 var(--ui);padding:5px 8px;border-radius:5px;background:var(--green-2);color:var(--green)}.grid-cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px;color:var(--ink);text-decoration:none}.card:hover{border-color:var(--green)}.card .mini{display:block;width:100%;aspect-ratio:1;border-radius:4px;overflow:hidden;margin-bottom:10px}.card b{font:700 1.02rem/1.25 var(--ui);display:block}.card span{font:400 .9rem/1.4 var(--ui);color:var(--mute)}.linklist{columns:2 16rem;column-gap:32px;padding:0;list-style:none;font:400 .98rem/1.4 var(--ui)}.linklist li{break-inside:avoid;padding:6px 0;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;justify-content:space-between;gap:2px 12px}.linklist li small{color:var(--mute);min-width:0}.ex-moves{columns:1}.ex-moves li{display:grid;grid-template-columns:4.5rem minmax(0,1fr);grid-template-areas:"mv nm" "mv 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ul{position:absolute;z-index:20;inset-inline:0;top:100%;margin:4px 0 0;padding:4px;list-style:none;background:#fff;color:var(--ink);border-radius:var(--r);box-shadow:0 8px 30px #00000040;max-height:60vh;overflow:auto}.search li a{display:block;padding:9px 10px;color:var(--ink);text-decoration:none;font:500 .98rem/1.3 var(--ui);border-radius:5px}.search li a:hover,.search li a[aria-selected=true]{background:var(--green-2)}.search li small{color:var(--mute)}footer.site{margin-top:64px;border-top:1px solid var(--line);padding-block:32px 48px;font:400 .95rem/1.55 var(--ui);color:var(--mute)}footer.site .cols4{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}footer.site ul{list-style:none;padding:0;margin:6px 0 0}footer.site li{margin:4px 0}footer.site a{color:var(--ink)}footer.site strong{color:var(--ink)}.grecaptcha-badge{visibility:hidden}@media print{header.site,footer.site,.ctl,.scrub,.noprint{display:none!important}.felt{background:#fff;color:#000}}pre.code{white-space:pre-wrap;word-break:break-all;background:var(--paper-2,#efede6);padding:12px 14px;border-radius:8px;font-size:.85rem;max-width:100%}.prose select,iframe{max-width:100%}