#caissa-subtitle{text-align:center;pointer-events:none;z-index:10;padding:0 8px;position:absolute;bottom:7%;left:0;right:0}#caissa-subtitle .sub-text{color:#fff;text-shadow:1px 1px 2px #000;direction:rtl;background-color:#000c;border-radius:7px;max-width:92%;padding:3px 12px;font-size:clamp(.68rem,.85vw,.95rem);font-weight:400;line-height:1.6;display:inline-block}.video-js.vjs-fullscreen #caissa-subtitle .sub-text{font-size:clamp(1rem,1.6vw,1.6rem)}#caissa-subtitle .eng,#caissa-subtitle b{color:#fbbf24;direction:ltr;padding:0 4px;font-weight:700;display:inline-block}.pgn-load-btn{color:#b45309;background-color:#d9770612;border-color:#d9770659}.pgn-load-btn:hover{background-color:#d9770629}.pgn-load-btn.is-active{color:#fff;background-color:#d97706;border-color:#d97706}.dark .pgn-load-btn{color:#fbbf24}.dark .pgn-load-btn.is-active{color:#fff}.video-js .vjs-big-play-button{color:#f59e0b!important;background-color:#0f172ad9!important;border:2px solid #ffffff1a!important;border-radius:50%!important;width:80px!important;height:80px!important;margin:0!important;line-height:80px!important;transition:all .2s ease-in-out!important;top:50%!important;left:50%!important;transform:translate(-50%,-50%)!important;box-shadow:0 10px 25px -5px #00000080!important}.video-js .vjs-big-play-button:hover{color:#0f172a!important;background-color:#f59e0b!important;transform:translate(-50%,-50%)scale(1.1)!important}.video-js video{object-fit:cover!important}.video-js .vjs-control-bar{padding-inline:10px;background:linear-gradient(#0000,#0f172a99,#0f172af2)!important;height:4.5em!important}.video-js .vjs-volume-panel{margin-inline-start:10px!important}#lesson-toolbar{background:#ffffffed;border:1px solid #94a3b859;border-radius:12px;align-items:stretch;width:100%;display:flex;overflow:hidden;box-shadow:0 2px 8px #0000001f}html.dark #lesson-toolbar{background:#111827ed;border-color:#94a3b847}#lesson-toolbar .lt-seg{z-index:0;color:#334155;white-space:nowrap;cursor:pointer;background:0 0;border:0;justify-content:center;align-items:center;gap:6px;padding:10px 16px;font-size:12.5px;font-weight:800;line-height:1.25;text-decoration:none;transition:background-color .15s,color .15s;display:flex;position:relative}html.dark #lesson-toolbar .lt-seg{color:#e2e8f0}#lesson-toolbar .lt-seg+.lt-seg:before{content:"";top:0;bottom:0;pointer-events:none;background:#94a3b873;width:1px;position:absolute;inset-inline-start:0;transform:skew(-16deg)}html.dark #lesson-toolbar .lt-seg+.lt-seg:before{background:#94a3b84d}#lesson-toolbar .lt-video,#lesson-toolbar .lt-board{flex:1 1 0;min-width:0}#lesson-toolbar .lt-report{flex:none}#lesson-toolbar.lt-slim .lt-seg{flex:1 1 0;min-width:0}#lesson-toolbar .lt-seg:after{content:"";top:0;bottom:0;z-index:-1;pointer-events:none;background:0 0;transition:background-color .15s;position:absolute;inset-inline:0;transform:skew(-16deg)}#lesson-toolbar .lt-seg:first-child:after{inset-inline-start:-14px}#lesson-toolbar .lt-seg:last-child:after{inset-inline-end:-14px}#lesson-toolbar .lt-video{color:#b45309}html.dark #lesson-toolbar .lt-video{color:#fbbf24}#lesson-toolbar .lt-video:hover:after{background:#f59e0b24}#lesson-toolbar .lt-board:hover:after{background:#64748b24}#lesson-toolbar .lt-report:hover:after{background:#ef44441a}#lesson-toolbar .lt-report:hover{color:#b91c1c}html.dark #lesson-toolbar .lt-report:hover{color:#fca5a5}@media (width<=639px){#lesson-toolbar{display:none}}#lesson-grid:not(.video-focus) #video-box{max-height:68vh;margin-inline:auto}#lesson-grid.board-focus .lt-report-m,#lesson-grid.video-focus .lt-report-m{order:3}#lesson-grid.board-focus #lesson-nav,#lesson-grid.video-focus #lesson-nav{order:4}#lesson-grid.video-focus #lesson-nav{width:100%;max-width:min(100%, calc((100vh - var(--caissa-stick-h,4rem) - 3rem) * 16 / 9));margin-inline:auto}#lesson-menu-btn{inset-inline-start:0;top:calc(var(--caissa-stick-h,4rem) - .5rem);z-index:45;color:#b45309;cursor:pointer;background:#fff;border:1px solid #00000014;border-top:0;border-start-start-radius:0;border-start-end-radius:0;border-end-end-radius:1rem;border-end-start-radius:0;justify-content:center;align-items:center;width:5.5rem;height:2.25rem;padding-top:.5rem;transition:background .15s,height .15s,box-shadow .15s;display:flex;position:fixed;box-shadow:0 8px 20px -10px #00000059}#lesson-menu-btn svg{width:1.35rem;height:1.35rem}#lesson-menu-btn:hover{background:#fffbeb;height:2.55rem;box-shadow:0 12px 24px -10px #00000073}#lesson-menu-btn:focus-visible{outline-offset:-3px;outline:2px solid #d97706}html.dark #lesson-menu-btn{color:#fbbf24;background:#1f2937;border-color:#ffffff14}html.dark #lesson-menu-btn:hover{background:#374151}.lesson-drawer{z-index:60;display:flex;position:fixed;inset:0}.lesson-drawer[hidden]{display:none}.lesson-drawer-veil{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#00000073;position:absolute;inset:0}.lesson-drawer-panel{border-inline-start:1px solid #00000014;width:min(22rem,88vw);height:100%;margin-inline-end:auto;animation:.18s ease-out lesson-drawer-in;position:relative;overflow-y:auto;box-shadow:-18px 0 45px -12px #00000059}html.dark .lesson-drawer-panel{border-inline-start-color:#ffffff14;box-shadow:-18px 0 45px -12px #000000bf}@keyframes lesson-drawer-in{0%{opacity:0;transform:translate(1.5rem)}to{opacity:1;transform:translate(0)}}@media (prefers-reduced-motion:reduce){.lesson-drawer-panel{animation:none}#lesson-menu-btn{transition:none}}.lesson-drawer-panel .lesson-title{text-overflow:clip;white-space:normal;overflow:visible}.lesson-drawer-panel h2{-webkit-line-clamp:unset;height:auto}.cg-wrap{aspect-ratio:1;width:100%;max-width:520px;height:auto;margin-inline:auto;position:relative}.cg-wrap cg-board{width:100%;height:100%;position:absolute;top:0;left:0}#lesson-grid{--board-max:clamp(280px, max(calc(36vw - 172px), calc(100vw - 120.9vh - 390px)), 560px);column-gap:1rem}@media (width<=639px){#lesson-grid:not(.board-focus){--board-max:min(560px, calc(100vw - 76px))}}@media (width<=1023px){#lesson-grid:not(.board-focus):not(.video-focus) :is(#lesson-left,#board-stack){display:contents}#lesson-grid:not(.board-focus):not(.video-focus){grid-auto-rows:max-content}#lesson-grid:not(.board-focus):not(.video-focus)>*{order:6}#lesson-grid:not(.board-focus):not(.video-focus) #lesson-left>*{order:5;margin-block:0}#lesson-grid:not(.board-focus):not(.video-focus) #video-box{order:1;width:min(100%,120.889vh)}#lesson-grid:not(.board-focus):not(.video-focus) #lesson-toolbar{order:2}#lesson-grid:not(.board-focus):not(.video-focus) #chess-card{order:3}#lesson-grid:not(.board-focus):not(.video-focus) #lesson-pgn-box{order:4}#study-column .nav-side [data-video-toggle]{display:none}#caissa-moves-box{min-height:clamp(8rem, calc(100vh - var(--caissa-stick-h,4rem) - var(--caissa-board-h,20rem) - 10rem), 280px);min-height:clamp(8rem, calc(100dvh - var(--caissa-stick-h,4rem) - var(--caissa-board-h,20rem) - 10rem), 280px)}}@media (width>=1250px){#lesson-grid:not(.board-focus):not(.video-focus){grid-template-columns:minmax(0,1fr) auto}}#lesson-grid{scrollbar-gutter:stable}#lesson-left{min-width:0}#lesson-toolbar .lt-seg>span{text-overflow:ellipsis;min-width:0;overflow:hidden}@media (width>=2400px){#lesson-grid{max-width:2200px;margin-inline:auto}}#lesson-grid.board-focus{--board-max:min(1100px, calc(100vh - 8rem))}#caissa-board.cg-wrap{max-width:var(--board-max,520px)}.board-col-w{width:100%;max-width:var(--board-max,520px);margin-inline:auto}#board-column>*{flex-shrink:0}@media (width>=1024px){#board-row{align-items:flex-start}#study-column{width:17rem;height:var(--caissa-board-h,auto)}#study-column .nav-ico{width:1.75rem;height:1.75rem}#study-column .nav-side{width:3.625rem}#board-row{justify-content:center}#board-column{width:var(--board-max);flex:0 auto;min-width:0}#lesson-grid:not(.board-focus) #board-stack{width:fit-content;margin-inline:auto}#lesson-grid:not(.board-focus) #lesson-pgn-box{width:0;min-width:100%}#lesson-grid.board-focus #study-column{width:28rem}}#lesson-grid.board-focus #lesson-pgn-box{box-shadow:none;border-radius:.75rem}#lesson-grid.board-focus #lesson-pgn-box>summary{padding:.625rem 1rem}@media (width>=1024px){#lesson-grid.board-focus:has(#lesson-pgn-box){--board-max:min(1000px, calc(100vh - 11rem));grid-template-columns:minmax(0,auto) 17rem;grid-auto-rows:max-content;justify-content:center;column-gap:2rem}#lesson-grid.board-focus:has(#lesson-pgn-box.is-collapsed){grid-template-columns:minmax(0,auto) 2.75rem}#lesson-grid.board-focus:has(#lesson-pgn-box) :is(#board-stack,#lesson-left){display:contents}#lesson-grid.board-focus:has(#lesson-pgn-box) #lesson-left>*{margin-block:0}#lesson-grid.board-focus:has(#lesson-pgn-box) #lesson-left>*{grid-column:1/-1}#lesson-grid.board-focus:has(#lesson-pgn-box)>*{grid-column:1/-1}#lesson-grid.board-focus:has(#lesson-pgn-box) #chess-card{grid-area:1/1}#lesson-grid.board-focus:has(#lesson-pgn-box) #lesson-toolbar{grid-area:2/1}#lesson-grid.board-focus #lesson-pgn-box{contain:size;grid-area:1/2/span 2;align-self:stretch;overflow-y:auto}#lesson-grid.board-focus #lesson-pgn-box>summary{pointer-events:none;z-index:2;background:#fff;justify-content:flex-start;gap:.5rem;position:sticky;top:0}.dark #lesson-grid.board-focus #lesson-pgn-box>summary{background:var(--color-gray-900)}#lesson-grid.board-focus #lesson-pgn-box>summary>h3{white-space:nowrap;min-width:0}#lesson-grid.board-focus #lesson-pgn-box>summary>span[aria-hidden]{display:none}#lesson-grid.board-focus .pgn-collapse-btn{pointer-events:auto;flex-shrink:0;order:-1;display:inline-flex}#lesson-grid.board-focus #lesson-pgn-box.is-collapsed .pgn-collapse-btn svg{transform:rotate(180deg)}#lesson-grid.board-focus #lesson-pgn-box.is-collapsed>div,#lesson-grid.board-focus #lesson-pgn-box.is-collapsed>summary>h3{display:none}#lesson-grid.board-focus #lesson-pgn-box.is-collapsed>summary{justify-content:center;padding-inline:0}#lesson-grid.board-focus #lesson-pgn-box>div{padding:.25rem 1rem 1rem}#lesson-grid.board-focus .pgn-card:first-child{border-top:0;border-start-start-radius:.5rem;border-start-end-radius:.5rem}#lesson-grid.board-focus .pgn-card:last-child{border-end-end-radius:.5rem;border-end-start-radius:.5rem}#lesson-grid.board-focus .pgn-card{background:var(--color-gray-100);border:0;border-top:1px solid #fff;border-radius:0;margin:0;padding:.625rem .875rem;transition:background-color .15s}#lesson-grid.board-focus .pgn-card:hover{background:var(--color-gray-200)}#lesson-grid.board-focus .pgn-card.is-current{background:color-mix(in oklab, var(--color-primary) 10%, #fff)}#lesson-grid.board-focus .pgn-card>div,#lesson-grid.board-focus .pgn-card>summary>span:first-child>span[aria-hidden]{display:none}.dark #lesson-grid.board-focus .pgn-card{background:var(--color-gray-800);border-top-color:var(--color-gray-900)}.dark #lesson-grid.board-focus .pgn-card:hover{background:var(--color-gray-700)}.dark #lesson-grid.board-focus .pgn-card.is-current{background:#fbbf241f}#lesson-grid.board-focus .pgn-lang-pair{display:none}#lesson-grid.board-focus .pgn-split{border-radius:var(--radius-field,.5rem);background:color-mix(in oklab, var(--color-primary) 40%, transparent);padding:1px;display:inline-flex}#lesson-grid.board-focus .pgn-split>.btn{--btn-color:#fff;--btn-fg:var(--color-primary);box-shadow:none;border:0;min-width:2.4rem;font-weight:900}#lesson-grid.board-focus .pgn-split>.btn.is-active{--btn-color:var(--color-primary);--btn-fg:var(--color-primary-content)}.dark #lesson-grid.board-focus .pgn-split{background:#fbbf2473}.dark #lesson-grid.board-focus .pgn-split>.btn{--btn-color:var(--color-gray-900);--btn-fg:#fbbf24}.dark #lesson-grid.board-focus .pgn-split>.btn.is-active{--btn-color:#fbbf24;--btn-fg:#111827}#lesson-grid.board-focus .pgn-split>.btn:first-child:not(:last-child){clip-path:polygon(0 0,100% 0,calc(100% - 8px) 100%,0 100%)}#lesson-grid.board-focus .pgn-split>.btn:last-child:not(:first-child){clip-path:polygon(8px 0,100% 0,100% 100%,0 100%);margin-inline-start:-6px}}.pgn-split,.pgn-collapse-btn{display:none}#lesson-grid.board-focus{grid-template-columns:minmax(0,1fr)}#lesson-grid.board-focus #board-stack{order:1}#lesson-grid.board-focus #lesson-left{order:2}#lesson-grid.board-focus #video-box,#lesson-grid.video-focus #board-stack{display:none}#lesson-grid.video-focus{grid-template-columns:minmax(0,1fr)}#lesson-grid.video-focus #lesson-left{width:100%;max-width:min(100%, calc((100vh - var(--caissa-stick-h,4rem) - 3rem) * 16 / 9));margin-inline:auto}#lesson-grid.video-focus #video-box{max-height:calc(100vh - var(--caissa-stick-h,4rem) - 3rem);margin-inline:auto}#lesson-grid.board-focus .cg-movelist{font-size:17px;line-height:1.5}#lesson-grid.board-focus .cg-mvnum{font-size:13px}#lesson-grid.board-focus .cg-mvrow{grid-template-columns:2.6rem 1fr 1fr}#lesson-grid.board-focus .cg-var{font-size:14px;line-height:1.6}#lesson-grid.board-focus .cg-cmt{font-size:15px;line-height:1.9}#lesson-grid.board-focus .pv-txt{font-size:14px}#lesson-grid.board-focus #pv-row-1,#lesson-grid.board-focus #pv-row-2,#lesson-grid.board-focus #pv-row-3{grid-template-columns:4rem 1fr}.pv-scroll{scrollbar-width:none;-ms-overflow-style:none}.pv-scroll::-webkit-scrollbar{display:none}html::-webkit-scrollbar{width:6px;height:6px}#lesson-grid::-webkit-scrollbar{width:6px;height:6px}#caissa-settings-body::-webkit-scrollbar{width:6px;height:6px}#caissa-scroll-wrapper::-webkit-scrollbar{width:6px;height:6px}#lesson-pgn-box pre::-webkit-scrollbar{width:6px;height:6px}html::-webkit-scrollbar-track{background:0 0}#lesson-grid::-webkit-scrollbar-track{background:0 0}#caissa-settings-body::-webkit-scrollbar-track{background:0 0}#caissa-scroll-wrapper::-webkit-scrollbar-track{background:0 0}#lesson-pgn-box pre::-webkit-scrollbar-track{background:0 0}html::-webkit-scrollbar-corner{background:0 0}#lesson-grid::-webkit-scrollbar-corner{background:0 0}#caissa-scroll-wrapper::-webkit-scrollbar-corner{background:0 0}#lesson-pgn-box pre::-webkit-scrollbar-corner{background:0 0}html::-webkit-scrollbar-thumb{background:#00000061;border-radius:999px}#lesson-grid::-webkit-scrollbar-thumb{background:#00000061;border-radius:999px}#caissa-settings-body::-webkit-scrollbar-thumb{background:#00000061;border-radius:999px}#caissa-scroll-wrapper::-webkit-scrollbar-thumb{background:#00000061;border-radius:999px}#lesson-pgn-box pre::-webkit-scrollbar-thumb{background:#00000061;border-radius:999px}html::-webkit-scrollbar-thumb:hover{background:#0000008c}#lesson-grid:hover::-webkit-scrollbar-thumb{background:#0000008c}#caissa-settings-body:hover::-webkit-scrollbar-thumb{background:#0000008c}#caissa-scroll-wrapper:hover::-webkit-scrollbar-thumb{background:#0000008c}#lesson-pgn-box pre:hover::-webkit-scrollbar-thumb{background:#0000008c}html.dark::-webkit-scrollbar-thumb{background:#ffffff4d}html.dark #lesson-grid::-webkit-scrollbar-thumb{background:#ffffff4d}html.dark #caissa-settings-body::-webkit-scrollbar-thumb{background:#ffffff4d}html.dark #caissa-scroll-wrapper::-webkit-scrollbar-thumb{background:#ffffff4d}html.dark #lesson-pgn-box pre::-webkit-scrollbar-thumb{background:#ffffff4d}html.dark::-webkit-scrollbar-thumb:hover{background:#ffffff73}html.dark #lesson-grid:hover::-webkit-scrollbar-thumb{background:#ffffff73}html.dark #caissa-settings-body:hover::-webkit-scrollbar-thumb{background:#ffffff73}html.dark #caissa-scroll-wrapper:hover::-webkit-scrollbar-thumb{background:#ffffff73}html.dark #lesson-pgn-box pre:hover::-webkit-scrollbar-thumb{background:#ffffff73}@supports not selector(::-webkit-scrollbar){html,#lesson-grid,#caissa-settings-body,#caissa-scroll-wrapper,#lesson-pgn-box pre{scrollbar-width:thin;scrollbar-color:#00000061 transparent}html.dark,html.dark #lesson-grid,html.dark #caissa-settings-body,html.dark #caissa-scroll-wrapper,html.dark #lesson-pgn-box pre{scrollbar-color:#ffffff4d transparent}}#lesson-sidebar::-webkit-scrollbar{width:6px;height:6px}#lesson-sidebar::-webkit-scrollbar-track{background:0 0}#lesson-sidebar::-webkit-scrollbar-corner{background:0 0}#lesson-sidebar::-webkit-scrollbar-thumb{background:#05164573;border-radius:999px}#lesson-sidebar:hover::-webkit-scrollbar-thumb{background:#051645ad}html.dark #lesson-sidebar::-webkit-scrollbar-thumb{background:#fbbf2480}html.dark #lesson-sidebar:hover::-webkit-scrollbar-thumb{background:#fbbf24bf}@supports not selector(::-webkit-scrollbar){#lesson-sidebar{scrollbar-width:thin;scrollbar-color:#05164573 transparent}html.dark #lesson-sidebar{scrollbar-color:#fbbf2480 transparent}}#caissa-board cg-board{background-image:var(--board-bg)!important;background-color:#0000!important;background-size:100% 100%!important}#caissa-board[data-piece-set=staunton3d]{aspect-ratio:512/464.5;margin-top:1.81%;overflow:visible}#caissa-board[data-piece-set=staunton3d] coords coord{color:#fff!important;text-shadow:0 1px 2px #000!important}#caissa-board[data-piece-set=staunton3d] coords.files{bottom:calc(1px - 2.5%)}#caissa-board[data-piece-set=staunton3d] coords.files coord{padding-left:3px}#caissa-board[data-piece-set=staunton3d] cg-board{background-image:none!important}#caissa-board[data-piece-set=staunton3d] cg-board:before{content:"";background-repeat:no-repeat;background-size:100% 100%;height:103.2%;position:absolute;top:-.7307%;left:0;right:0}#caissa-board[data-piece-set=staunton3d] piece{width:16.741%;height:23.563%;top:-9.1%;left:-1.85%}#caissa-board square.light.check,#caissa-board square.dark.check{background-color:#dc262699!important;background-image:radial-gradient(#ff0000e6 0%,#c800001a 70%)!important;box-shadow:inset 0 0 25px 2px #f00c!important}.cg-wrap square{pointer-events:none;width:12.5%;height:12.5%;position:absolute}.cg-wrap piece{z-index:2;cursor:grab;background-size:cover;width:12.5%;height:12.5%;position:absolute}#caissa-board cg-board{touch-action:pinch-zoom}.cg-wrap piece.dragging{z-index:10;cursor:grabbing}.cpu-ico{opacity:.7;width:1.25rem;height:1.25rem;transition:opacity .15s}#btn-toggle-engine:hover .cpu-ico{opacity:1}html.dark .cpu-ico,#btn-toggle-engine.is-on .cpu-ico{filter:invert();opacity:1}#btn-toggle-engine.is-on{background:#059669;border-color:#059669}#btn-toggle-engine.is-on:hover{background:#047857;border-color:#047857}.nav-ico{color:#6b7280;border-radius:.5rem;justify-content:center;align-items:center;width:2rem;height:2rem;font-size:.95rem;line-height:1;transition:background-color .15s,color .15s;display:flex}.nav-side{width:4.125rem}.nav-ico:hover{color:#111827;background:#0000000f}html.dark .nav-ico{color:#9ca3af}html.dark .nav-ico:hover{color:#fff;background:#ffffff14}.rating-slider{--thumb:18px;--track:4px;padding-bottom:1.15rem;position:relative}.rating-bar{left:0;right:0;top:calc((var(--thumb) - var(--track)) / 2);height:var(--track);background:#11182724;border-radius:999px;position:absolute}html.dark .rating-bar{background:#ffffff29}.rating-fill{width:calc(var(--thumb) / 2 + var(--v,0) * (100% - var(--thumb)));background:linear-gradient(90deg,#a3e635,#65a30d);border-radius:999px;transition:width .12s ease-out;position:absolute;top:0;bottom:0;left:0}.rating-tick{top:50%;left:calc(var(--thumb) / 2 + var(--f) * (100% - var(--thumb)));background:#11182747;width:1px;height:9px;position:absolute;transform:translate(-50%,-50%)}html.dark .rating-tick{background:#ffffff4d}.rating-slider input[type=range]{appearance:none;width:100%;height:var(--thumb);cursor:pointer;background:0 0;margin:0;display:block;position:relative}.rating-slider input[type=range]:focus{outline:none}.rating-slider input[type=range]::-webkit-slider-runnable-track{height:var(--thumb);background:0 0}.rating-slider input[type=range]::-moz-range-track{height:var(--thumb);background:0 0}.rating-slider input[type=range]::-webkit-slider-thumb{appearance:none;width:var(--thumb);height:var(--thumb);background:#fff;border:1px solid #1118272e;border-radius:50%;transition:transform .12s ease-out;box-shadow:0 1px 4px #00000059}.rating-slider input[type=range]::-moz-range-thumb{width:var(--thumb);height:var(--thumb);background:#fff;border:1px solid #1118272e;border-radius:50%;transition:transform .12s ease-out;box-shadow:0 1px 4px #00000059}.rating-slider input[type=range]:hover::-webkit-slider-thumb{transform:scale(1.12)}.rating-slider input[type=range]:focus-visible::-webkit-slider-thumb{transform:scale(1.12)}.rating-slider input[type=range]:hover::-moz-range-thumb{transform:scale(1.12)}.rating-slider input[type=range]:focus-visible::-moz-range-thumb{transform:scale(1.12)}.rating-slider input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 3px #65a30d73}.rating-slider input[type=range]:focus-visible::-moz-range-thumb{box-shadow:0 0 0 3px #65a30d73}.rating-scale{height:1rem;position:absolute;bottom:0;left:0;right:0}.rating-mark{top:0;left:calc(var(--thumb) / 2 + var(--f) * (100% - var(--thumb)));white-space:nowrap;color:#9ca3af;font-size:10px;font-weight:700;line-height:1rem;transition:color .12s;position:absolute;transform:translate(-50%)}.rating-mark.is-on{color:#4d7c0f}html.dark .rating-mark.is-on{color:#a3e635}.caissa-mat{pointer-events:none;-webkit-user-select:none;user-select:none;align-items:center;gap:.25rem;height:1rem;padding:0 .15rem;display:flex;position:absolute;left:0;right:0;overflow:hidden}#caissa-mat-top{bottom:100%}#caissa-mat-bottom{top:100%}.caissa-mat[hidden]{display:none}.mat-group{display:inline-flex}.mat-group+.mat-group{margin-inline-start:.3rem}.mat-ico{filter:grayscale();opacity:.55;background-position:50%;background-repeat:no-repeat;background-size:contain;width:.95rem;height:.95rem;display:block}.mat-ico+.mat-ico{margin-inline-start:-.42rem}html.dark .mat-ico{filter:grayscale()invert()brightness(.92);opacity:.8}.mat-edge{color:#6b7280;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.72rem;font-weight:700;line-height:1}html.dark .mat-edge{color:#9ca3af}@media (width>=1024px){#lesson-grid.board-focus:has(#lesson-pgn-box){grid-template-columns:minmax(1rem,.5fr) minmax(0,auto) minmax(20rem,1fr);grid-template-rows:calc(100vh - var(--caissa-stick-h,4rem) - 3rem);justify-content:stretch}#lesson-grid.board-focus:has(#lesson-pgn-box.is-collapsed){grid-template-columns:minmax(1rem,.5fr) minmax(0,auto) minmax(2.75rem,1fr)}#lesson-grid.board-focus:has(#lesson-pgn-box) #chess-card{grid-area:1/2;align-self:center}#lesson-grid.board-focus:has(#lesson-pgn-box) #lesson-toolbar{grid-area:2/2}#lesson-grid.board-focus #lesson-pgn-box{width:20rem;height:calc(100vh - var(--caissa-stick-h,4rem));border:0;border-inline-start:1px solid var(--color-gray-200);border-radius:0;grid-area:1/3;justify-self:end;margin-block-start:-1.5rem;margin-inline-end:-1.5rem}.dark #lesson-grid.board-focus #lesson-pgn-box{border-inline-start-color:var(--color-gray-800)}#lesson-grid.board-focus #lesson-pgn-box.is-collapsed{width:2.75rem}:is(#lesson-grid.board-focus,#lesson-grid.board-focus:has(#lesson-pgn-box)){--board-max:min(760px, calc(100vh - var(--caissa-stick-h,4rem) - 9rem))}#lesson-grid.board-focus:has(#lesson-pgn-box){column-gap:2.5rem}#lesson-grid.board-focus #chess-card{box-shadow:none;background:0 0;border:0;border-radius:0;padding:0}#lesson-grid.board-focus #board-row{gap:1.75rem}#lesson-grid.board-focus #caissa-board{box-shadow:0 1px 3px #0000002e}#lesson-grid.board-focus #study-column{border-color:var(--color-gray-200);background:#fff;border-radius:.75rem;width:22rem}.dark #lesson-grid.board-focus #study-column{background:var(--color-gray-900);border-color:var(--color-gray-800)}#lesson-grid.board-focus #study-column>div:first-child,#lesson-grid.board-focus #study-column>div:last-child{background:0 0}.dark #lesson-grid.board-focus #study-column>div:first-child,.dark #lesson-grid.board-focus #study-column>div:last-child{border-color:var(--color-gray-800)}#lesson-grid.board-focus #study-column .nav-side{width:auto}#lesson-grid.board-focus .cg-movelist{font-size:15px}#lesson-grid.board-focus .cg-cmt{font-size:14px;line-height:1.8}#lesson-grid.board-focus .cg-var{font-size:13px}#lesson-grid.board-focus #study-column:has(#btn-toggle-engine[aria-pressed=false]) :is(#engine-score,#engine-meta){visibility:hidden}#lesson-grid.board-focus #lesson-pgn-box>summary{border-bottom:1px solid var(--color-gray-200);padding:.9rem 1.25rem}.dark #lesson-grid.board-focus #lesson-pgn-box>summary{border-bottom-color:var(--color-gray-800)}#lesson-grid.board-focus #lesson-pgn-box>summary>h3{font-size:15px}#lesson-grid.board-focus #lesson-pgn-box>div{padding:0;display:block}#lesson-grid.board-focus .pgn-card,#lesson-grid.board-focus .pgn-card:first-child,#lesson-grid.board-focus .pgn-card:last-child{border:0;border-bottom:1px solid var(--color-gray-200);background:0 0;border-radius:0;padding:.75rem 1.25rem}#lesson-grid.board-focus .pgn-card:hover{background:var(--color-gray-50)}#lesson-grid.board-focus .pgn-card.is-current,.dark #lesson-grid.board-focus .pgn-card.is-current{background:var(--color-primary)}#lesson-grid.board-focus .pgn-card.is-current .pgn-title{color:var(--color-primary-content)}.dark #lesson-grid.board-focus .pgn-card{border-bottom-color:var(--color-gray-800);background:0 0}.dark #lesson-grid.board-focus .pgn-card:hover{background:#ffffff0a}#lesson-grid.board-focus .pgn-card .pgn-title{text-align:start;unicode-bidi:plaintext;font-size:14px;font-weight:600}#lesson-grid.board-focus .pgn-split:not(:has(>.btn+.btn)){display:none}.dark #lesson-grid.board-focus .pgn-split{background:var(--color-gray-700)}.dark #lesson-grid.board-focus .pgn-split>.btn{--btn-color:var(--color-gray-900);--btn-fg:var(--color-gray-300)}.dark #lesson-grid.board-focus .pgn-split>.btn.is-active{--btn-color:var(--color-primary);--btn-fg:#fff}}