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#ffd66b40}[data-theme=night] .lesson-card--game{background:linear-gradient(135deg,#261c08b3,#4d3c0466);border-color:#ffd66b66;box-shadow:0 8px 32px #ffd66b14,inset 0 1px #ffd66b1f}.lesson-card__game-tag{color:#2a1810;letter-spacing:1.5px;vertical-align:middle;background:#ffd66b;border-radius:9999px;margin-left:8px;padding:2px 8px;font-size:10px;font-weight:800;display:inline-block}.lesson-card__action-playable--game,[data-theme=night] .lesson-card__action-playable--game{color:#2a1810;background:#ffd66b}.lesson-card--quiz{border-color:#cffe3e8c;box-shadow:0 8px 32px #cffe3e1f,inset 0 1px #cffe3e33}.lesson-card--quiz:hover{box-shadow:0 12px 32px #cffe3e33,inset 0 1px #cffe3e40}[data-theme=night] .lesson-card--quiz{background:linear-gradient(135deg,#121c08b3,#3c4d0466);border-color:#cffe3e66;box-shadow:0 8px 32px #cffe3e14,inset 0 1px 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14px;display:flex;position:sticky;top:24px;overflow:hidden}.sidebar:before{content:"";background:var(--accent);filter:blur(45px);opacity:0;pointer-events:none;z-index:0;border-radius:50%;width:140px;height:140px;transition:opacity .28s;position:absolute;top:-30px;left:-30px}[data-theme=night] .sidebar:before{opacity:.12}.sidebar>*{z-index:1;position:relative}.sidebar-user{align-items:center;gap:12px;padding:6px 10px;display:flex}.sidebar-user-pill{background:var(--surface-inverse);width:40px;height:40px;color:var(--text-on-inverse);box-shadow:0 2px 6px var(--shadow-medium);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:15px;font-weight:500;display:flex}[data-theme=night] .sidebar-user-pill{background:var(--accent-bg-tint);color:var(--accent);box-shadow:none;border:1px solid #cf03;border-radius:10px}.sidebar-user-text{min-width:0}.sidebar-user-name{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:14px;font-weight:500;overflow:hidden}.sidebar-user-age{color:var(--text-tertiary);font-size:12px}.sidebar-nav{flex-direction:column;gap:4px;display:flex}.sidebar-nav-item{color:var(--text-secondary);border-radius:12px;align-items:center;gap:10px;padding:10px 12px;font-family:inherit;font-size:14px;font-weight:500;text-decoration:none;transition:background .15s,color .15s,transform .15s;display:flex;position:relative}.sidebar-nav-item:hover{background:var(--surface-recessed);color:var(--text-primary)}.sidebar-nav-item-active{background:var(--surface-recessed-strong);color:var(--text-primary);font-weight:500}.sidebar-nav-item-active:before{content:"";background:var(--accent);opacity:0;border-radius:50%;width:4px;height:4px;transition:opacity .28s;position:absolute;top:50%;left:-2px;transform:translateY(-50%);box-shadow:0 0 6px #ccff00e6}[data-theme=night] .sidebar-nav-item-active:before{opacity:1}[data-theme=night] .sidebar-nav-item-active{color:var(--accent)}.sidebar-nav-item-icon{justify-content:center;align-items:center;width:22px;font-size:16px;display:inline-flex}.sidebar-nav-item-label{flex:1}.sidebar-signout-form{margin-top:auto;padding-top:8px}.sidebar-signout{color:var(--text-tertiary);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:10px;align-items:center;gap:10px;width:100%;padding:10px 12px;font-family:inherit;font-size:13px;font-weight:500;transition:background .12s,color .12s;display:flex}.sidebar-signout:hover{background:var(--surface-recessed);color:var(--text-primary)}.back-button{background:var(--surface-raised);-webkit-backdrop-filter:blur(20px)saturate(180%);backdrop-filter:blur(20px)saturate(180%);border:1px solid var(--stroke-defined);color:var(--text-primary);cursor:pointer;box-shadow:0 4px 12px var(--shadow-soft);border-radius:9999px;align-self:flex-start;align-items:center;gap:6px;padding:8px 14px 8px 12px;font-family:inherit;font-size:13px;font-weight:500;transition:background .15s,transform .15s,box-shadow .15s;display:inline-flex}.back-button:hover{background:var(--surface-raised-strong);box-shadow:0 6px 16px var(--shadow-medium);transform:translateY(-1px)}[data-theme=night] .back-button{border:1px solid var(--stroke-defined);color:var(--text-primary);box-shadow:0 4px 12px var(--shadow-soft);background:linear-gradient(135deg,#121212b3,#044d4066)}[data-theme=night] .back-button:hover{box-shadow:0 6px 16px var(--shadow-medium);background:linear-gradient(135deg,#121212cc,#044d408c)}.back-button-floating{z-index:1000;position:fixed;top:16px;left:16px}.placeholder-card{background:linear-gradient(135deg, var(--surface-raised) 0%, var(--surface-raised) 100%);-webkit-backdrop-filter:blur(20px)saturate(180%);backdrop-filter:blur(20px)saturate(180%);border:1px solid 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.15s,box-shadow .15s,background .15s,opacity .15s}.bn-button:hover:not(:disabled){box-shadow:4px 4px 0 var(--btn-shadow);transform:translate(-1px,-1px)}.bn-button:active:not(:disabled){box-shadow:0 0 0 var(--btn-shadow);transform:translate(3px,3px)}.bn-button:disabled{opacity:.4;cursor:not-allowed}.bn-button--highlight{opacity:1;color:var(--btn-primary-text);background:var(--btn-primary-bg)}.bn-board--summary{gap:0}.bn-summary{flex-direction:column;align-items:stretch;gap:20px;width:432px;max-width:90%;display:flex}.bn-summary-options{flex-direction:column;gap:12px;display:flex}.bn-summary-option{font-family:var(--btn-font);text-align:left;color:var(--btn-ink);background:var(--btn-secondary-bg);border:2.5px solid var(--btn-ink);box-shadow:3px 3px 0 var(--btn-shadow);cursor:pointer;border-radius:15px;align-items:center;gap:13px;padding:15px 18px;font-size:16px;font-weight:700;transition:transform .15s,box-shadow .15s,background .15s;display:flex}.bn-summary-option:hover{box-shadow:4px 4px 0 var(--btn-shadow);transform:translate(-1px,-1px)}.bn-summary-option:active{box-shadow:0 0 0 var(--btn-shadow);transform:translate(3px,3px)}.bn-summary-option--checked{background:var(--btn-primary-bg);color:var(--btn-primary-text)}.bn-summary-check{border:2px solid var(--stroke-strong);background:var(--surface-overlay);width:26px;height:26px;color:var(--text-on-accent);border-radius:7px;flex:none;justify-content:center;align-items:center;font-size:15px;font-weight:800;transition:border-color .15s,background-color .15s;display:inline-flex}.bn-summary-option--checked .bn-summary-check{border-color:var(--accent);background:var(--accent)}.bn-summary-label{flex:1}.bn-summary-submit{color:#cffe3e;cursor:pointer;box-shadow:0 4px 14px var(--shadow-medium);background:#381e2b;border:none;border-radius:14px;align-self:center;padding:13px 46px;font-size:16px;font-weight:700;transition:transform .11s,box-shadow .15s,opacity .15s}.bn-summary-submit:hover:not(:disabled){box-shadow:0 8px 20px var(--shadow-strong);transform:translateY(-2px)}.bn-summary-submit:active:not(:disabled){transform:translateY(0)scale(.97)}.bn-summary-submit:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}.tn-board{z-index:6;box-sizing:border-box;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:16px;display:flex;position:absolute;inset:0}.tn-square-anim{animation:.38s cubic-bezier(.34,1.2,.64,1) both bnSquareIn}.tn-fraction{background:var(--surface-raised-strong);border:1px solid var(--stroke-defined);box-shadow:0 3px 12px var(--shadow-soft);border-radius:18px;flex-direction:column;align-items:center;padding:6px 26px;display:flex}.tn-fraction-num{text-align:center;color:#0f6e56;min-width:30px;font-size:30px;font-weight:800;line-height:1.05}.tn-fraction-den{text-align:center;min-width:30px;color:var(--text-primary);font-size:30px;font-weight:800;line-height:1.05}.tn-fraction-bar{background:#0f6e56;border-radius:3px;width:38px;height:5px;margin:3px 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var(--btn-shadow);transform:translate(-1px,-1px)}.tn-button:active:not(:disabled){box-shadow:0 0 0 var(--btn-shadow);transform:translate(3px,3px)}.tn-button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.tn-button--highlight{opacity:1;color:var(--btn-primary-text);background:var(--btn-primary-bg)}.tn-board--summary{gap:24px}.tn-summary{background:var(--surface-raised-strong);border:1px solid var(--stroke-defined);box-shadow:0 6px 18px var(--shadow-medium);border-radius:22px;flex-direction:column;align-items:center;padding:26px 36px;display:flex}.tn-summary-fraction{flex-direction:column;align-items:center;display:flex;position:relative}.tn-summary-row{justify-content:center;align-items:center;width:100%;display:flex;position:relative}.tn-summary-num,.tn-summary-den{text-align:center;min-width:80px;font-size:76px;font-weight:800;line-height:1}.tn-summary-num{color:#0f6e56}.tn-summary-den{color:var(--text-primary)}.tn-summary-bar{background:#0f6e56;border-radius:4px;width:100px;height:8px;margin:8px 0}.tn-summary-callout{background:var(--accent-soft,#eaf7e2);border:1.5px solid var(--accent);color:var(--text-primary);white-space:nowrap;border-radius:14px;align-items:center;gap:8px;padding:6px 14px;font-size:14px;font-weight:700;animation:.36s cubic-bezier(.34,1.2,.64,1) both tnCalloutIn;display:flex;position:absolute;left:calc(50% + 70px)}.tn-summary-arrow{color:var(--accent);font-size:18px;font-weight:800}.tn-summary-callout-text{letter-spacing:.01em}@keyframes 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.14s;display:inline-flex}.paint-tool-button:hover{border-color:var(--accent-secondary);transform:translateY(-2px)}.paint-tool-button:active{transform:translateY(0)scale(.96)}.paint-tool-button--active{background:var(--accent);border-color:var(--accent);color:var(--text-on-accent);box-shadow:0 0 0 4px var(--accent-soft,#cffe3e59)}.paint-tool-button--reset{opacity:.85}.paint-tool-button-label{letter-spacing:.02em;font-weight:700}.paint-color-row{border-left:1px solid var(--stroke-defined);border-right:1px solid var(--stroke-defined);align-items:center;gap:8px;padding:0 4px;display:flex}.paint-color-swatch{border:2px solid var(--stroke-defined);cursor:pointer;border-radius:50%;width:36px;height:36px;padding:0;transition:transform .11s,border-color .14s,box-shadow .14s}.paint-color-swatch:hover{transform:translateY(-2px)}.paint-color-swatch:active{transform:translateY(0)scale(.92)}.paint-color-swatch--active{border-color:var(--text-primary);box-shadow:0 0 0 3px var(--accent-soft,#cffe3e66);transform:translateY(-2px)}.paint-tool-button--pulse,.paint-color-swatch--pulse{animation:1.1s ease-in-out infinite paintToolbarPulse}@keyframes paintToolbarPulse{0%,to{box-shadow:0 0 0 0 var(--accent-soft,#cffe3e99);transform:translateY(0)}50%{transform:translateY(-3px);box-shadow:0 0 0 10px #0000}}.paint-board--picker{gap:24px}.pe-board{z-index:6;box-sizing:border-box;flex-direction:column;justify-content:center;align-items:center;gap:18px;padding:16px;display:flex;position:absolute;inset:0}.pe-board--celebrate{animation:.62s cubic-bezier(.4,0,.2,1) both paintCelebrate}.pe-grids{justify-content:center;align-items:flex-start;gap:36px;display:flex}.pe-grid-col{flex-direction:column;align-items:center;gap:10px;display:flex}.pe-fraction{color:var(--text-primary);min-height:28px;font-size:22px}.pe-fraction-placeholder{min-height:28px}.pe-grid-side-label{letter-spacing:.08em;text-transform:uppercase;color:var(--text-secondary,var(--text-primary));opacity:.55;font-size:12px;font-weight:700}.pe-equiv{color:var(--text-primary);background:var(--surface-raised-strong);box-shadow:0 3px 12px var(--shadow-soft);border-radius:14px;padding:6px 18px;font-size:30px;animation:.38s cubic-bezier(.34,1.2,.64,1) both paintSquareIn}.pe-controls{align-items:center;gap:14px;display:flex}.pe-button{border:1.5px solid var(--stroke-defined);cursor:pointer;border-radius:12px;min-width:96px;height:46px;padding:0 20px;font-size:15px;font-weight:700;transition:transform .11s,background-color .14s,border-color .14s,box-shadow .14s}.pe-button:hover{transform:translateY(-2px)}.pe-button:active{transform:translateY(0)scale(.96)}.pe-button--gotit{background:var(--accent);border-color:var(--accent);color:var(--text-on-accent);box-shadow:0 0 0 4px var(--accent-soft,#cffe3e59)}.pe-button--help{background:var(--surface-raised-strong);color:var(--text-primary)}.ppg{flex-direction:column;align-items:center;gap:12px;display:flex}.ppg-square{background:var(--stroke-defined);box-shadow:0 8px 20px var(--shadow-medium);border-radius:12px;position:relative;overflow:hidden}.ppg-grid{background:var(--stroke-defined);gap:1px;width:100%;height:100%;animation:.38s cubic-bezier(.34,1.2,.64,1) both paintSquareIn;display:grid}.ppg-piece{border:1px solid #0000;width:100%;height:100%;transition:background-color .2s}.ppg-grid--wave .ppg-piece--fill{animation:.26s cubic-bezier(.34,1.2,.64,1) both ppgFillPop}@keyframes ppgFillPop{0%{opacity:.25;transform:scale(.7)}to{opacity:1;transform:scale(1)}}.ppg-toolbar{background:var(--surface-raised-strong);border:1px solid var(--stroke-defined);box-shadow:0 3px 12px var(--shadow-soft);border-radius:16px;align-items:center;gap:12px;padding:8px 14px;display:flex}.ppg-color-row{border-right:1px solid var(--stroke-defined);align-items:center;gap:8px;padding:0 4px;display:flex}.ppg-swatch{border:2px solid var(--stroke-defined);cursor:pointer;border-radius:50%;width:36px;height:36px;padding:0;transition:transform .11s,border-color .14s,box-shadow .14s}.ppg-swatch:hover{transform:translateY(-2px)}.ppg-swatch:active{transform:translateY(0)scale(.92)}.ppg-swatch--active{border-color:var(--text-primary);box-shadow:0 0 0 3px var(--accent-soft,#cffe3e66);transform:translateY(-2px)}.ppg-reset{min-width:44px;height:44px;color:var(--text-primary);background:var(--surface-overlay,var(--surface-raised-strong));border:1.5px solid var(--stroke-defined);cursor:pointer;opacity:.85;border-radius:12px;align-items:center;gap:6px;padding:0 12px;font-size:14px;font-weight:700;transition:transform .11s,border-color .14s;display:inline-flex}.ppg-reset:hover{border-color:var(--accent-secondary);transform:translateY(-2px)}.ppg-reset:active{transform:translateY(0)scale(.96)}.ppg-reset-label{letter-spacing:.02em;font-weight:700}.sb-board{z-index:6;box-sizing:border-box;flex-direction:column;justify-content:center;align-items:center;gap:18px;padding:16px;display:flex;position:absolute;inset:0}.sb-board--celebrate{animation:.62s cubic-bezier(.4,0,.2,1) both paintCelebrate}.sb-panels{justify-content:center;align-items:flex-start;gap:44px;display:flex}.sb-panel{flex-direction:column;align-items:center;gap:10px;display:flex}.sb-caption{letter-spacing:.04em;color:var(--text-secondary,var(--text-primary));opacity:.75;min-height:18px;font-size:13px;font-weight:700}.sb-caption-placeholder{min-height:18px}.sb-fractions{align-items:center;gap:22px;min-height:36px;font-size:26px;display:flex}.sb-fractions-placeholder{min-height:36px}.sb-fraction{animation:.32s cubic-bezier(.34,1.2,.64,1) both paintSquareIn}.sb-placeholder{background:var(--surface-raised-strong);border:2px solid var(--stroke-defined);box-shadow:0 8px 20px var(--shadow-medium);border-radius:12px;justify-content:center;align-items:center;display:flex}.sb-placeholder-mark{color:var(--stroke-defined);font-size:72px;font-weight:800}.sb-toolbar{background:var(--surface-raised-strong);border:1px solid var(--stroke-defined);box-shadow:0 3px 12px 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