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var(--cgb-hero-h));min-height:0;box-shadow:none;border-bottom:none;overflow:hidden}@media (min-width:1024px) and (min-height:1100px){#cgb-play.cgb-play-fold{height:auto;max-height:none;overflow:visible}#cgb-play .cgb-board-card,#cgb-play .cgb-play-cluster{flex:0 auto;height:auto;max-height:none}#cgb-play .chess-stage{width:min(100%,var(--cgb-board-max));max-width:var(--cgb-board-max);aspect-ratio:1;flex:none;height:auto}#cgb-play .chess-board-frame{width:min(100%,var(--cgb-board-max));height:min(100%,var(--cgb-board-max))}}:is(.cgb-board-card:fullscreen .chess-stage,.cgb-board-card.cgb-immersive .chess-stage){aspect-ratio:auto;flex:auto;width:100%;max-width:none;height:auto;min-height:0}:is(.cgb-board-card:fullscreen .chess-board-frame,.cgb-board-card.cgb-immersive .chess-board-frame){width:var(--cgb-board-side,min(92vmin,960px));height:var(--cgb-board-side,min(92vmin,960px));max-width:100%;max-height:100%}.cgb-board-card.cgb-immersive{z-index:60;background:var(--background);width:100%;max-width:none;height:100%;max-height:none;padding:max(.5rem,env(safe-area-inset-top,0px)) max(.5rem,env(safe-area-inset-right,0px)) max(.5rem,env(safe-area-inset-bottom,0px)) max(.5rem,env(safe-area-inset-left,0px));border:0;border-radius:0;position:fixed;inset:0}.chess-board-frame{--cgb-board-fallback:min(var(--cgb-board-max),calc(100vw - var(--cgb-play-pad-x)),calc(100svh - var(--cgb-hero-h) - var(--cgb-play-chrome-h)));box-sizing:border-box;aspect-ratio:1;width:var(--cgb-board-side,var(--cgb-board-fallback));height:var(--cgb-board-side,var(--cgb-board-fallback));background:#5d3d28;border:5px solid #5d3d28;border-radius:5px;max-width:100%;max-height:100%;box-shadow:0 10px 25px #4127164a}.cgb-dark .chess-board-frame{background:#5a3d2a;border-color:#5a3d2a}.cgb-sq-light{background-color:#f3e6d4}.cgb-sq-dark{background-color:#7a5235}.cgb-dark .cgb-sq-light{background-color:#c4b09a}.cgb-dark .cgb-sq-dark{background-color:#5c3d28}.cgb-chess-piece{object-fit:contain;filter:drop-shadow(0 2px 2px #0000004d);pointer-events:none;-webkit-user-select:none;user-select:none;width:88%;height:88%}.cgb-tool-btn{border:1px solid var(--border);background:var(--card);width:2.25rem;height:2.25rem;color:var(--muted-foreground);border-radius:.5rem;flex-shrink:0;justify-content:center;align-items:center;transition:color .15s,border-color .15s,background-color .15s;display:inline-flex}@media (max-width:639px){.cgb-tool-btn{width:2rem;height:2rem}}@media (max-width:1023px){.chess-board-frame{touch-action:manipulation}.chess-board-frame button{-webkit-tap-highlight-color:transparent}}.cgb-tool-btn:hover{color:var(--foreground);border-color:var(--primary)}@supports (color:color-mix(in lab,red,red)){.cgb-tool-btn:hover{border-color:color-mix(in srgb,var(--primary) 45%,var(--border))}}.cgb-tool-btn[aria-pressed=true]{color:var(--primary);border-color:var(--primary)}@supports (color:color-mix(in lab,red,red)){.cgb-tool-btn[aria-pressed=true]{border-color:color-mix(in srgb,var(--primary) 55%,var(--border))}}.cgb-pwa-install--icon>span>button{border:1px solid var(--border);background:var(--card);color:var(--muted-foreground);opacity:1;border-radius:.5rem;gap:0!important;width:2.25rem!important;height:2.25rem!important;padding:0!important}.cgb-pwa-install--icon>span>button:hover{color:var(--foreground);opacity:1}.cgb-pwa-install--icon>span>button>span{display:none!important}.cgb-board-move-log{scrollbar-width:thin;scrollbar-color:var(--border) transparent;margin:0;padding:0;list-style:none}@supports (color:color-mix(in lab,red,red)){.cgb-board-move-log{scrollbar-color:color-mix(in srgb,var(--border) 90%,var(--muted-foreground)) transparent}}.cgb-board-move-log::-webkit-scrollbar{width:8px}.cgb-board-move-log::-webkit-scrollbar-track{background:0 0}.cgb-board-move-log::-webkit-scrollbar-thumb{background:var(--border);border-radius:9999px}@supports (color:color-mix(in lab,red,red)){.cgb-board-move-log::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--border) 75%,var(--muted-foreground))}}.cgb-board-move-log::-webkit-scrollbar-thumb{background-clip:padding-box;border:2px solid #0000}.cgb-board-move-log::-webkit-scrollbar-thumb:hover{background:var(--border)}@supports (color:color-mix(in lab,red,red)){.cgb-board-move-log::-webkit-scrollbar-thumb:hover{background:color-mix(in srgb,var(--border) 45%,var(--muted-foreground))}}.cgb-board-move-log::-webkit-scrollbar-thumb:hover{background-clip:padding-box;border:2px solid #0000}.cgb-board-move-log::-webkit-scrollbar-button{width:0;height:0;display:none}.cgb-board-move-log-row{color:var(--foreground);border-bottom:1px dashed var(--border);padding:5px 0;font-size:12px;line-height:1.45}@supports (color:color-mix(in lab,red,red)){.cgb-board-move-log-row{border-bottom:1px dashed color-mix(in srgb,var(--border) 70%,transparent)}}.cgb-board-move-log-row{word-break:break-word}.cgb-board-move-log-row:last-child{border-bottom:none}.cgb-board-move-log-row-inner{align-items:flex-start;gap:.5rem;width:100%;min-width:0;display:flex}.cgb-board-move-log-num{font-variant-numeric:tabular-nums;min-width:1.75rem;color:var(--muted-foreground);flex-shrink:0;font-weight:600}.cgb-board-move-log-san{min-width:0;font-family:var(--cgb-font-mono),ui-monospace,monospace;color:var(--foreground);flex:1;font-weight:500}.cgb-board-move-log-dot{border-radius:9999px;flex-shrink:0;width:.5rem;height:.5rem;margin-top:.35rem;box-shadow:0 0 0 1px #0000001f}.cgb-board-move-log-empty{color:var(--muted-foreground);border-bottom:none;padding:5px 0;font-size:13px;list-style:none}.cgb-dark .cgb-board-move-log-dot{box-shadow:0 0 0 1px #ffffff2e}@keyframes cgb-piece-slide{0%{transform:translate(var(--cgb-fx),var(--cgb-fy))}to{transform:translate(var(--cgb-tx),var(--cgb-ty))}}.cgb-chess-anim{pointer-events:none;will-change:transform;justify-content:center;align-items:center;width:12.5%;height:12.5%;animation:cgb-piece-slide .36s cubic-bezier(.33,1.08,.42,1) both;display:flex;position:absolute;top:0;left:0}@keyframes cgb-check-pulse{0%,to{box-shadow:inset 0 0 0 2px #dc26268c,inset 0 0 14px 4px #dc262659}50%{box-shadow:inset 0 0 0 3px #dc2626f2,inset 0 0 24px 9px #dc2626a6}}.cgb-check-sq{background-color:#ef444457;animation:cgb-check-pulse .85s ease-in-out infinite}@keyframes cgb-check-flash{0%{opacity:0}16%{opacity:1}to{opacity:0}}.cgb-check-flash{animation:cgb-check-flash .85s ease-out forwards;box-shadow:inset 0 0 0 3px #ef4444f2,inset 0 0 46px 12px #ef444480}@keyframes cgb-check-badge{0%{opacity:0;transform:translate(-50%,-8px)scale(.7)}55%{opacity:1;transform:translate(-50%)scale(1.08)}to{opacity:1;transform:translate(-50%)scale(1)}}.cgb-check-badge{animation:cgb-check-badge .4s cubic-bezier(.34,1.4,.5,1) both}.cgb-seo-band{background:#e7ded1}@supports (color:color-mix(in lab,red,red)){.cgb-seo-band{background:color-mix(in srgb,#e7ded1 72%,var(--background))}}.cgb-seo-band{color:var(--foreground)}.cgb-dark .cgb-seo-band{color:#f0e8dc;background:#221c17}.cgb-seo-copy{color:var(--muted-foreground)}.cgb-dark .cgb-seo-copy{color:#d8c8b6}.cgb-article-more{color:var(--muted-foreground);content-visibility:auto;contain-intrinsic-size:auto 3200px;font-size:1rem;line-height:1.65}.cgb-dark .cgb-article-more,.cgb-dark .cgb-article-more .article-section dd,.cgb-dark .cgb-article-more .article-section p,.cgb-dark .cgb-article-more .cgb-split-copy p,.cgb-dark .cgb-article-more li{color:#d8c8b6}.cgb-dark .cgb-article-more .article-lead-title,.cgb-dark .cgb-article-more .article-section h2{color:#f0e8dc}.cgb-article-more a{color:var(--primary);text-underline-offset:3px;font-weight:600;text-decoration:underline}.cgb-article-more .article-kicker{font-family:var(--cgb-font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--primary);margin:0 0 .25rem;font-size:.7rem;font-weight:600}.cgb-article-more .article-lead{border-bottom:1px solid var(--border);padding-bottom:1.75rem}.cgb-article-more .article-lead-title{font-family:var(--cgb-font-display);letter-spacing:-.03em;color:var(--foreground);margin:.4rem 0 1.1rem;font-size:clamp(1.55rem,3.2vw,2.15rem);font-weight:600;line-height:1.08}.cgb-article-more .article-section{border-bottom:1px solid var(--border);content-visibility:auto;contain-intrinsic-size:auto 360px;padding:1.75rem 0}.cgb-article-more .article-section:last-child{border-bottom:0;padding-bottom:0}.cgb-article-more .article-section h2{font-family:var(--cgb-font-display);color:var(--foreground);letter-spacing:-.025em;margin:.35rem 0 .9rem;font-size:1.35rem;font-weight:600;line-height:1.15}.cgb-article-more .article-section dd,.cgb-article-more .article-section p,.cgb-article-more .cgb-split-copy p{color:var(--muted-foreground);font-size:1rem;line-height:1.65}.cgb-article-more ol,.cgb-article-more ul{margin:.75rem 0;padding-left:1.25rem}.cgb-article-more li{margin:.35rem 0}.cgb-article-more ol{list-style:decimal}.cgb-article-more ul{list-style:outside}.cgb-split{align-items:start;gap:1.15rem;margin:.25rem 0 .35rem;display:grid}.cgb-split-copy>p:first-child,.cgb-split-copy>ul:first-child{margin-top:0}.cgb-split-copy>p+p{margin-top:.9rem}@media (min-width:800px){.cgb-split{grid-template-columns:minmax(0,1fr) minmax(12.5rem,17.5rem);align-items:center;gap:1.5rem 2rem}.cgb-split--figure-end .cgb-article-figure{grid-area:1/2;justify-self:end;margin-top:.45rem}.cgb-split--figure-end .cgb-split-copy{grid-area:1/1}.cgb-split--figure-start{grid-template-columns:minmax(12.5rem,17.5rem) minmax(0,1fr)}.cgb-split--figure-start .cgb-article-figure{grid-area:1/1;justify-self:start;margin-top:-.2rem}.cgb-split--figure-start .cgb-split-copy{grid-area:1/2}.cgb-article-more .article-section:nth-of-type(odd) .cgb-split--figure-start .cgb-article-figure{margin-top:.85rem}.cgb-article-more .article-section:nth-of-type(2n) .cgb-split--figure-end .cgb-article-figure{margin-top:-.35rem}}.cgb-article-figure{border:1px solid var(--border);background:#241f1a;border-radius:2px;justify-self:start;width:100%;max-width:22.5rem;margin:0;overflow:hidden}.cgb-article-figure-img{aspect-ratio:320/168;background:#241f1a;width:100%;max-width:320px;height:auto;display:block}.cgb-article-figure-cap{border-top:1px solid var(--border);font-family:var(--cgb-font-mono);color:var(--muted-foreground);background:var(--card);margin:0;padding:.55rem .7rem .65rem;font-size:.78rem;line-height:1.4}@supports (color:color-mix(in lab,red,red)){.cgb-article-figure-cap{background:color-mix(in srgb,var(--card) 55%,transparent)}}.cgb-faq-list{margin-top:1rem}.cgb-faq-item{margin:1rem 0}.cgb-faq-item dt{color:var(--foreground);font-weight:600}.cgb-faq-item dd{color:var(--muted-foreground);margin:.25rem 0 0}.cgb-link-rail{flex-wrap:wrap;gap:.75rem 1.25rem;display:flex}.cgb-compare-line a{font-weight:600}@property --tw-translate-x{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-y{syntax:"*";inherits:false;initial-value:0}@property --tw-translate-z{syntax:"*";inherits:false;initial-value:0}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-space-y-reverse{syntax:"*";inherits:false;initial-value:0}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-duration{syntax:"*";inherits:false}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@keyframes spin{to{transform:rotate(1turn)}}