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16px 0 34px #0000003d;--shadow-input:inset 0 1px 0 #ffffff0d, 0 1px 0 #0003;--shadow-button:0 1px 0 #ffffff24 inset, 0 12px 24px #00000047;--shadow-button-soft:0 1px 0 #ffffff0f inset, 0 10px 22px #0003;--shadow-badge:0 1px 0 #ffffff0f inset;--shadow-inset-soft:inset 0 1px 0 #ffffff0f;--shadow-progress-track:inset 0 1px 2px #00000047}html{background-color:var(--color-page);background-image:var(--app-background);scrollbar-gutter:stable;background-size:auto,44px 44px,44px 44px;background-attachment:fixed}body{min-height:100vh;color:var(--color-text);font-family:var(--font-ui);background:0 0}button,input,select,textarea{font:inherit}.app-container{min-height:100vh;color:var(--color-text)}::selection{background:color-mix(in srgb, var(--color-focus) 42%, transparent);color:var(--color-text)}@keyframes wallet-balance-reward{0%{box-shadow:var(--shadow-button-soft);transform:translateY(0)scale(1)}36%{box-shadow:0 0 0 4px color-mix(in srgb, var(--color-warning) 16%, transparent), var(--shadow-button-soft);transform:translateY(-1px)scale(1.035)}to{box-shadow:var(--shadow-button-soft);transform:translateY(0)scale(1)}}@keyframes wallet-balance-delta{0%{opacity:0;transform:translateY(.2rem)scale(.86)}18%{opacity:1;transform:translateY(-.05rem)scale(1)}78%{opacity:1;transform:translateY(-.25rem)scale(1)}to{opacity:0;transform:translateY(-.55rem)scale(.96)}}@keyframes reward-toast-in{0%{opacity:0;transform:translateY(-.45rem)scale(.98)}to{opacity:1;transform:translate(0,0)scale(1)}}@keyframes reward-toast-out{0%{opacity:1;transform:translate(0,0)scale(1)}to{opacity:0;transform:translateY(-.28rem)scale(.985)}}@keyframes reward-coin-float{0%{opacity:0;transform:translateY(.15rem)scale(.7)rotate(0)}18%{opacity:1;transform:translate3d(var(--coin-mid-x), -.25rem, 0) scale(1) rotate(55deg)}to{opacity:0;transform:translate3d(var(--coin-x), var(--coin-y), 0) scale(.76) rotate(180deg)}}#lesson-board *{cursor:inherit}#lesson-board,#lesson-board *{-webkit-user-select:none;user-select:none;-webkit-user-drag:none}#lesson-board svg,#lesson-board text,#lesson-board tspan{pointer-events:none}#lesson-board{--cg-dark:var(--board-dark);--cg-light:var(--board-light)}#lesson-board cg-board{background-color:var(--board-light);background-image:linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark)), linear-gradient(var(--board-dark), var(--board-dark));background-position:14.2857% 0,42.8571% 0,71.4286% 0,100% 0,0 14.2857%,28.5714% 14.2857%,57.1429% 14.2857%,85.7143% 14.2857%,14.2857% 28.5714%,42.8571% 28.5714%,71.4286% 28.5714%,100% 28.5714%,0 42.8571%,28.5714% 42.8571%,57.1429% 42.8571%,85.7143% 42.8571%,14.2857% 57.1429%,42.8571% 57.1429%,71.4286% 57.1429%,100% 57.1429%,0 71.4286%,28.5714% 71.4286%,57.1429% 71.4286%,85.7143% 71.4286%,14.2857% 85.7143%,42.8571% 85.7143%,71.4286% 85.7143%,100% 85.7143%,0 100%,28.5714% 100%,57.1429% 100%,85.7143% 100%;background-repeat:no-repeat;background-size:12.5% 12.5%}#lesson-board square.move-dest{background:radial-gradient(var(--board-move-dest) 18%, transparent 20%)}#lesson-board square.oc.move-dest{background:radial-gradient(transparent 0%, transparent 78%, var(--board-move-dest) 80%)}#lesson-board square.last-move,#lesson-board square.selected{background-color:var(--board-last-move)}#lesson-board square.selected{box-shadow:inset 0 0 0 3px var(--board-selected-ring)}#lesson-board,#lesson-board *{-webkit-user-select:none;user-select:none}#lesson-board .cg-coords,#lesson-board svg text,#lesson-board text,#lesson-board tspan,#lesson-board [class*=notation],#lesson-board [class*=Notation]{pointer-events:none!important}#lesson-board.cg-wrap coords{font-family:var(--font-ui);font-size:var(--board-coordinate-size);font-weight:var(--board-coordinate-weight);letter-spacing:0;opacity:1;text-shadow:var(--board-coordinate-shadow);text-transform:uppercase;z-index:6;display:none;color:var(--board-coordinate-text)!important}#lesson-board.cg-wrap coords coord,#lesson-board.cg-wrap.orientation-white .ranks :nth-child(odd),#lesson-board.cg-wrap.orientation-white .ranks :nth-child(2n),#lesson-board.cg-wrap.orientation-white .files :nth-child(odd),#lesson-board.cg-wrap.orientation-white .files :nth-child(2n),#lesson-board.cg-wrap.orientation-black .ranks :nth-child(odd),#lesson-board.cg-wrap.orientation-black .ranks :nth-child(2n),#lesson-board.cg-wrap.orientation-black .files :nth-child(odd),#lesson-board.cg-wrap.orientation-black .files :nth-child(2n),#lesson-board.cg-wrap coords.squares:nth-of-type(odd) :nth-child(odd),#lesson-board.cg-wrap coords.squares:nth-of-type(odd) :nth-child(2n),#lesson-board.cg-wrap coords.squares:nth-of-type(2n) :nth-child(odd),#lesson-board.cg-wrap coords.squares:nth-of-type(2n) :nth-child(2n){color:var(--board-coordinate-text)!important}#lesson-board.cg-wrap coords.ranks{align-items:flex-start;width:18px;top:0;left:6px}#lesson-board.cg-wrap coords.ranks coord{padding-top:6px;padding-left:0;transform:none}#lesson-board.cg-wrap coords.files{text-align:right;width:100%;height:18px;bottom:4px;left:0}#lesson-board.cg-wrap coords.files coord{padding-right:6px}#lesson-board.cg-wrap coords.squares coord{padding:8% 9%}.board-with-external-coordinates{position:relative}.board-rank-labels{grid-template-rows:repeat(8,minmax(0,1fr));justify-items:center;display:grid;position:absolute;top:0;left:0}.board-file-labels{grid-template-columns:repeat(8,minmax(0,1fr));place-items:center;display:grid}.board-rank-labels .board-coordinate-outside,.board-file-labels .board-coordinate-outside{align-self:center}.board-coordinate-outside,.board-coordinate{color:var(--board-coordinate-text);font-family:var(--font-ui);font-size:var(--board-coordinate-size);font-weight:var(--board-coordinate-weight);letter-spacing:0;pointer-events:none;text-shadow:none;text-transform:uppercase;-webkit-user-select:none;user-select:none;line-height:1}.board-coordinate.board-coordinate-each{font-size:var(--board-coordinate-each-size)}#lesson-board cg-board{cursor:default}#lesson-board piece{background-position:50%;background-repeat:no-repeat;display:block}#lesson-board cg-board piece{cursor:grab}#lesson-board piece.dragging{cursor:grabbing;filter:drop-shadow(var(--shadow-piece));opacity:1!important;z-index:20!important}.file\:mr-3::file-selector-button{margin-right:.75rem}.file\:rounded-md::file-selector-button{border-radius:.375rem}.file\:border-0::file-selector-button{border-width:0}.file\:bg-\[var\(--color-surface-muted\)\]::file-selector-button{background-color:var(--color-surface-muted)}.file\:px-3::file-selector-button{padding-left:.75rem;padding-right:.75rem}.file\:py-1\.5::file-selector-button{padding-top:.375rem;padding-bottom:.375rem}.file\:text-sm::file-selector-button{font-size:.875rem;line-height:1.25rem}.file\:font-medium::file-selector-button{font-weight:500}.file\:text-\[var\(--color-text\)\]::file-selector-button{color:var(--color-text)}.placeholder\:text-\[var\(--color-text-faint\)\]::placeholder{color:var(--color-text-faint)}.hover\:border-\[var\(--color-accent\)\]:hover{border-color:var(--color-accent)}.hover\:border-\[var\(--color-border\)\]:hover{border-color:var(--color-border)}.hover\:border-\[var\(--color-border-muted\)\]:hover{border-color:var(--color-border-muted)}.hover\:border-\[var\(--color-focus\)\]:hover{border-color:var(--color-focus)}.hover\:bg-\[var\(--color-accent-soft\)\]:hover{background-color:var(--color-accent-soft)}.hover\:bg-\[var\(--color-danger\)\]:hover{background-color:var(--color-danger)}.hover\:bg-\[var\(--color-danger-soft\)\]:hover{background-color:var(--color-danger-soft)}.hover\:bg-\[var\(--color-surface\)\]:hover{background-color:var(--color-surface)}.hover\:bg-\[var\(--color-surface-hover\)\]:hover{background-color:var(--color-surface-hover)}.hover\:bg-\[var\(--color-surface-muted\)\]:hover{background-color:var(--color-surface-muted)}.hover\:text-\[var\(--color-danger\)\]:hover{color:var(--color-danger)}.hover\:text-\[var\(--color-on-accent\)\]:hover{color:var(--color-on-accent)}.hover\:text-\[var\(--color-text\)\]:hover{color:var(--color-text)}.hover\:underline:hover{text-decoration-line:underline}.hover\:shadow-\[var\(--shadow-button-soft\)\]:hover{--tw-shadow-color:var(--shadow-button-soft);--tw-shadow:var(--tw-shadow-colored)}.hover\:brightness-105:hover{--tw-brightness:brightness(1.05);filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}.hover\:brightness-110:hover{--tw-brightness:brightness(1.1);filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}.hover\:file\:bg-\[var\(--color-surface-hover\)\]::file-selector-button:hover{background-color:var(--color-surface-hover)}.focus\:border-\[var\(--color-focus\)\]:focus{border-color:var(--color-focus)}.focus\:ring-2:focus{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow,0 0 #0000)}.focus\:ring-\[var\(--color-focus-ring\)\]:focus{--tw-ring-color:var(--color-focus-ring)}.focus-visible\:outline-none:focus-visible{outline-offset:2px;outline:2px solid #0000}.focus-visible\:ring-2:focus-visible{--tw-ring-offset-shadow:var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);--tw-ring-shadow:var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);box-shadow:var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow,0 0 #0000)}.focus-visible\:ring-\[var\(--color-focus-ring\)\]:focus-visible{--tw-ring-color:var(--color-focus-ring)}.focus-visible\:ring-offset-2:focus-visible{--tw-ring-offset-width:2px}.disabled\:pointer-events-none:disabled{pointer-events:none}.disabled\:cursor-not-allowed:disabled{cursor:not-allowed}.disabled\:opacity-50:disabled{opacity:.5}.disabled\:shadow-none:disabled{--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;box-shadow:var(--tw-ring-offset-shadow,0 0 #0000), var(--tw-ring-shadow,0 0 #0000), var(--tw-shadow)}.group:hover .group-hover\:translate-x-0\.5{--tw-translate-x:.125rem;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.group:hover .group-hover\:scale-\[1\.035\]{--tw-scale-x:1.035;--tw-scale-y:1.035;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}@media (prefers-reduced-motion:no-preference){.motion-safe\:hover\:-translate-y-0\.5:hover{--tw-translate-y:-.125rem;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.motion-safe\:active\:translate-y-0:active{--tw-translate-y:0px;transform:translate(var(--tw-translate-x), var(--tw-translate-y)) rotate(var(--tw-rotate)) skewX(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}}@media (width>=640px){.sm\:w-auto{width:auto}.sm\:min-w-\[420px\]{min-width:420px}.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.sm\:grid-cols-\[minmax\(0\,1fr\)_minmax\(170px\,210px\)\]{grid-template-columns:minmax(0,1fr) minmax(170px,210px)}.sm\:flex-row{flex-direction:row}.sm\:items-end{align-items:flex-end}.sm\:items-center{align-items:center}.sm\:justify-between{justify-content:space-between}.sm\:self-end{align-self:flex-end}.sm\:p-3{padding:.75rem}.sm\:p-7{padding:1.75rem}}@media (width>=768px){.md\:left-auto{left:auto}.md\:right-6{right:1.5rem}.md\:top-6{top:1.5rem}.md\:col-span-2{grid-column:span 2/span 2}.md\:block{display:block}.md\:hidden{display:none}.md\:w-\[min\(22rem\,calc\(100vw-2rem\)\)\]{width:min(22rem,100vw - 2rem)}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.md\:grid-cols-\[48px\,minmax\(0\,1fr\)\,220px\]{grid-template-columns:48px minmax(0,1fr) 220px}.md\:grid-cols-\[minmax\(180px\,0\.8fr\)\,minmax\(0\,1fr\)\]{grid-template-columns:minmax(180px,.8fr) minmax(0,1fr)}.md\:grid-cols-\[minmax\(220px\,0\.7fr\)\,minmax\(0\,1fr\)\]{grid-template-columns:minmax(220px,.7fr) minmax(0,1fr)}.md\:grid-cols-\[minmax\(220px\,0\.8fr\)\,minmax\(0\,1fr\)\]{grid-template-columns:minmax(220px,.8fr) minmax(0,1fr)}.md\:flex-row{flex-direction:row}.md\:items-start{align-items:flex-start}.md\:items-end{align-items:flex-end}.md\:items-center{align-items:center}.md\:justify-between{justify-content:space-between}.md\:p-6{padding:1.5rem}.md\:pb-0{padding-bottom:0}.md\:pl-64{padding-left:16rem}.md\:text-3xl{font-size:1.875rem;line-height:2.25rem}}@media (width>=1024px){.lg\:sticky{position:sticky}.lg\:top-4{top:1rem}.lg\:order-none{order:0}.lg\:block{display:block}.lg\:hidden{display:none}.lg\:w-\[360px\]{width:360px}.lg\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.lg\:grid-cols-\[0\.9fr\,1\.1fr\]{grid-template-columns:.9fr 1.1fr}.lg\:grid-cols-\[minmax\(0\,0\.95fr\)_minmax\(0\,1\.05fr\)\]{grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr)}.lg\:grid-cols-\[minmax\(0\,1fr\)\,340px\]{grid-template-columns:minmax(0,1fr) 340px}.lg\:grid-cols-\[minmax\(0\,1fr\)\,360px\]{grid-template-columns:minmax(0,1fr) 360px}.lg\:grid-cols-\[minmax\(0\,1fr\)\,380px\]{grid-template-columns:minmax(0,1fr) 380px}.lg\:grid-cols-\[minmax\(0\,1fr\)\,420px\]{grid-template-columns:minmax(0,1fr) 420px}.lg\:grid-cols-\[minmax\(0\,1fr\)\,minmax\(280px\,0\.38fr\)\]{grid-template-columns:minmax(0,1fr) minmax(280px,.38fr)}.lg\:grid-cols-\[minmax\(360px\,1fr\)\,minmax\(260px\,320px\)\]{grid-template-columns:minmax(360px,1fr) minmax(260px,320px)}.lg\:grid-cols-\[minmax\(480px\,1fr\)\,minmax\(260px\,320px\)\]{grid-template-columns:minmax(480px,1fr) minmax(260px,320px)}.lg\:flex-row{flex-direction:row}.lg\:items-start{align-items:flex-start}.lg\:items-end{align-items:flex-end}.lg\:items-center{align-items:center}.lg\:justify-between{justify-content:space-between}.lg\:self-start{align-self:flex-start}.lg\:border-b-0{border-bottom-width:0}.lg\:border-r{border-right-width:1px}}@media (width>=1280px){.xl\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.xl\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.xl\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.xl\:grid-cols-5{grid-template-columns:repeat(5,minmax(0,1fr))}.xl\:grid-cols-\[260px\,minmax\(0\,1fr\)\]{grid-template-columns:260px minmax(0,1fr)}.xl\:grid-cols-\[minmax\(320px\,1\.2fr\)\,minmax\(220px\,0\.8fr\)\,minmax\(360px\,1fr\)\]{grid-template-columns:minmax(320px,1.2fr) minmax(220px,.8fr) minmax(360px,1fr)}.xl\:grid-cols-\[minmax\(420px\,860px\)\,320px\]{grid-template-columns:minmax(420px,860px) 320px}.xl\:grid-cols-\[minmax\(560px\,1fr\)\,420px\]{grid-template-columns:minmax(560px,1fr) 420px}.xl\:grid-cols-\[minmax\(560px\,860px\)\,320px\]{grid-template-columns:minmax(560px,860px) 320px}.xl\:grid-cols-\[minmax\(620px\,1fr\)\,390px\]{grid-template-columns:minmax(620px,1fr) 390px}.xl\:flex-row{flex-direction:row}.xl\:items-start{align-items:flex-start}.xl\:items-center{align-items:center}.xl\:justify-end{justify-content:flex-end}.xl\:justify-center{justify-content:center}.xl\:justify-between{justify-content:space-between}}@media (width>=1536px){.\32 xl\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.\32 xl\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.\32 xl\:grid-cols-\[minmax\(680px\,1fr\)\,420px\]{grid-template-columns:minmax(680px,1fr) 420px}}