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.board-annotation-tool-btn{width:1.75rem;height:1.75rem;min-width:1.75rem}@media(min-width:768px){.board-shell-immersive .board-annotation-toolbar-inline .board-annotation-tool-btn{width:2rem;height:2rem;min-width:2rem}}.board-stage-content{position:relative;flex:1;min-width:0;min-height:0;display:flex;flex-direction:column}.board-annotation-layer{position:absolute;top:0;right:0;bottom:0;left:0;z-index:12;pointer-events:none}.board-annotation-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;touch-action:none}.board-annotation-canvas.is-drawing{pointer-events:auto;cursor:crosshair}.board-annotation-canvas.is-eraser{cursor:cell}.board-annotation-canvas.is-highlighter{cursor:copy}.board-annotation-canvas:not(.is-drawing){pointer-events:none}.board-annotation-tool-btn[aria-pressed=true]{background:hsl(var(--primary) / .15);color:hsl(var(--primary))}.board-teacher-rail{z-index:10}[data-board-immersive] .board-slide-header,.board-shell-immersive 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.board-formula{display:block;padding:.65rem .85rem;margin:.5rem 0;border-left:4px solid hsl(var(--primary));background:hsl(var(--primary) / .08);font-family:ui-monospace,monospace;font-size:.875rem;color:hsl(var(--foreground))}.board-explain-drawer .board-tip,.board-rail-explain-body .board-tip{padding:.65rem .85rem;margin:.5rem 0;border-radius:.5rem;background:hsl(var(--board-tip-bg));color:hsl(var(--board-tip-fg));font-size:.875rem}.board-explain-drawer .board-example,.board-rail-explain-body .board-example{padding:.65rem .85rem;margin:.5rem 0;border-radius:.5rem;background:hsl(var(--board-example-bg));border:1px solid hsl(var(--board-example-border));color:hsl(var(--board-example-fg));font-size:.875rem}@media(max-width:640px){.board-explain-drawer{right:2.75rem;width:min(18rem,calc(100vw - 3.5rem))}}.board-practice-viewport{color:hsl(var(--foreground));background:hsl(var(--card))}.board-practice-header .board-section-badge{font-size:.8rem;padding:.25rem .65rem;background:hsl(var(--primary) / .12);color:hsl(var(--primary))}.board-practice-topic{font-size:1.35em;line-height:1.25;color:hsl(var(--foreground))}.board-practice-attempts{font-size:.85em;color:hsl(var(--muted-foreground))}.board-practice-prompt{font-size:1.25em;font-weight:600;color:hsl(var(--foreground))}.board-practice-question{border-color:hsl(var(--border));background:hsl(var(--muted) / .35)}.board-passage{border-color:hsl(var(--border));background:hsl(var(--background))}.board-passage-label{font-size:.75em;color:hsl(var(--muted-foreground))}.board-passage-text{font-size:1.05em;color:hsl(var(--foreground))}.board-practice-option{display:flex;align-items:flex-start;gap:.75rem;font-size:1.1em;line-height:1.45;color:hsl(var(--foreground));border-color:hsl(var(--border));background:hsl(var(--background))}.board-option-letter{display:inline-flex;min-width:2rem;height:2rem;align-items:center;justify-content:center;border-radius:999px;background:hsl(var(--primary) / .15);color:hsl(var(--primary));font-weight:700;font-size:.85em}.board-option-text{flex:1;padding-top:.15rem}.board-practice-input{font-size:1.1em;color:hsl(var(--foreground));background:hsl(var(--background));border-color:hsl(var(--border))}.board-option-btn.is-selected{border-color:hsl(var(--primary));background:hsl(var(--primary) / .08);box-shadow:0 0 0 2px hsl(var(--primary) / .2)}.board-option-btn.is-picked-wrong{border-color:hsl(var(--destructive));background:hsl(var(--destructive) / .08);animation:board-shake .35s ease}.board-option-btn.is-picked-wrong .board-option-letter{background:hsl(var(--destructive) / .2);color:hsl(var(--destructive))}.board-option-btn.is-picked-correct,.board-option-btn.is-revealed-correct{border-color:hsl(var(--board-option-correct-border));background:hsl(var(--board-option-correct-bg));animation:board-pop .35s ease}.board-option-btn.is-picked-correct .board-option-letter,.board-option-btn.is-revealed-correct .board-option-letter{background:hsl(var(--success) / .25);color:hsl(var(--success))}.dark .board-option-btn.is-picked-correct .board-option-letter,.dark .board-option-btn.is-revealed-correct .board-option-letter{background:hsl(var(--success) / .3);color:hsl(var(--success-foreground))}@keyframes board-shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}@keyframes board-pop{0%{transform:scale(1)}50%{transform:scale(1.02)}to{transform:scale(1)}}.board-feedback-stack{display:flex;flex-direction:column;gap:.65rem}.board-feedback-card{border-radius:.75rem;border:1px solid transparent;padding:.85rem 1rem}.board-feedback-card-head{display:flex;align-items:center;gap:.5rem;font-size:1em;font-weight:700;margin-bottom:.35rem}.board-feedback-card-body{margin:0;font-size:.95em;line-height:1.6}.board-feedback-encourage{border-color:hsl(var(--secondary) / .45);background:hsl(var(--secondary) / .12);color:hsl(var(--foreground))}.board-feedback-wrong{border-color:hsl(var(--destructive) / .45);background:hsl(var(--destructive) / .12);color:hsl(var(--foreground))}.dark .board-feedback-wrong{color:hsl(var(--destructive-foreground))}.board-feedback-correct{border-color:hsl(var(--success) / .45);background:hsl(var(--success) / .14);color:hsl(var(--foreground))}.board-feedback-rule{border-color:hsl(var(--primary) / .4);background:hsl(var(--primary) / .1);color:hsl(var(--foreground))}.board-feedback-trick{border-color:hsl(var(--warning) / .5);background:hsl(var(--board-tip-bg));color:hsl(var(--board-tip-fg))}.board-feedback-example{border-color:hsl(var(--board-example-border));background:hsl(var(--board-example-bg));color:hsl(var(--board-example-fg))}.board-attempt-label{font-size:.8em;text-transform:uppercase;letter-spacing:.04em;color:hsl(var(--muted-foreground))}.board-visual-guide{display:flex;flex-direction:column;gap:1rem;min-height:min(70vh,640px);padding:.25rem 0}.bvg-header{text-align:center}.bvg-headline{margin:0;font-size:1.5rem;font-weight:700;line-height:1.2;color:hsl(var(--foreground))}.bvg-summary{margin:.5rem auto 0;max-width:42rem;font-size:1rem;line-height:1.55;color:hsl(var(--muted-foreground))}.bvg-diagram{margin:0 auto;max-width:100%}.bvg-diagram svg{max-height:min(28vh,240px);border-radius:.75rem}.bvg-steps{display:flex;flex-wrap:wrap;justify-content:center;gap:.5rem}.bvg-step{display:inline-flex;align-items:center;gap:.35rem;padding:.45rem .85rem;border:2px solid hsl(var(--border));border-radius:999px;background:hsl(var(--background));color:hsl(var(--muted-foreground));font-size:.8rem;font-weight:600;cursor:pointer;transition:border-color .15s,background .15s,color .15s,transform .15s}.bvg-step:hover{border-color:hsl(var(--primary) / .5);color:hsl(var(--foreground))}.bvg-step.is-active{border-color:hsl(var(--primary));background:hsl(var(--primary) / .1);color:hsl(var(--primary));transform:translateY(-1px);box-shadow:0 4px 12px hsl(var(--primary) / .15)}.board-visual-guide.is-reveal-all .bvg-step.is-active{opacity:1}.bvg-step-icon{font-size:1.1rem;line-height:1}.bvg-stage{flex:1;min-height:12rem;display:flex;flex-direction:column;gap:.75rem}.bvg-panel{flex:1;padding:1.25rem 1.5rem;border-radius:1rem;border:2px solid hsl(var(--border));background:linear-gradient(145deg,hsl(var(--card)),hsl(var(--muted) / .35));animation:bvg-panel-in .25s ease}.bvg-panel.is-active{border-color:hsl(var(--primary) / .45);box-shadow:0 8px 24px hsl(var(--primary) / .1)}.board-visual-guide.is-reveal-all .bvg-stage{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.75rem}.board-visual-guide.is-reveal-all .bvg-panel{flex:unset;min-height:8rem}@keyframes bvg-panel-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.bvg-panel-title{margin:0 0 .65rem;font-size:1.15rem;font-weight:700;color:hsl(var(--foreground))}.bvg-panel-body{margin:0;font-size:1.05rem;line-height:1.65;color:hsl(var(--foreground))}.bvg-highlight{padding:.85rem 1rem;border-radius:.75rem;border:1px solid hsl(var(--board-highlight-border));background:hsl(var(--board-highlight-bg));color:hsl(var(--board-highlight-fg))}.bvg-highlight-label{display:block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:.25rem}.bvg-highlight p{margin:0;font-size:.95rem;line-height:1.5}.bvg-controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:.5rem;padding-top:.25rem}.bvg-btn{padding:.5rem 1rem;border-radius:.5rem;border:1px solid hsl(var(--border));background:hsl(var(--background));color:hsl(var(--foreground));font-size:.875rem;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s}.bvg-btn:hover:not(:disabled){background:hsl(var(--muted));border-color:hsl(var(--primary) / .4)}.bvg-btn:disabled{opacity:.4;cursor:not-allowed}.bvg-btn.bvg-reveal{border-color:hsl(var(--primary) / .5);color:hsl(var(--primary))}.bvg-progress{min-width:4rem;text-align:center;font-size:.875rem;font-weight:600;color:hsl(var(--muted-foreground))}[data-surface=smartboard] .bvg-headline{font-size:2rem}[data-surface=smartboard] .bvg-summary,[data-surface=smartboard] .bvg-panel-body{font-size:1.35rem}[data-surface=smartboard] .bvg-step{font-size:1rem;padding:.6rem 1.1rem}[data-surface=smartboard] .bvg-btn{font-size:1.05rem;padding:.65rem 1.25rem}.board-stage[data-board-surface=smartboard] .bvg-panel-title{font-size:1.45rem}.board-animation{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:1rem;min-height:8rem;width:100%}.board-animation svg,.board-animation .anim-html{max-width:100%;width:100%;max-height:min(52vh,520px);height:auto}.board-animation svg text,.board-animation svg tspan{fill:currentColor}.dark .board-animation svg{filter:brightness(1.15)}[data-surface=smartboard] .board-animation svg,[data-surface=smartboard] .board-animation .anim-html{max-height:min(58vh,640px)}[data-surface=smartboard] .board-practice-prompt{font-size:1.45em}[data-surface=smartboard] .board-practice-option{font-size:1.25em;padding:1rem 1.15rem}[data-surface=smartboard] .board-feedback-card-body{font-size:1.05em}[data-surface=smartboard] .board-option-letter{min-width:2.35rem;height:2.35rem;font-size:1em}[data-surface=smartboard] .board-slide-body{font-size:1.5rem;padding:1rem 1.5rem 1.5rem;line-height:1.65}[data-surface=tablet] .board-slide-body{font-size:1.15rem}.board-explain-drawer{position:absolute;bottom:0;right:3rem;top:0;z-index:20;display:flex;width:min(22rem,42vw);flex-direction:column;border-left:1px solid hsl(var(--border));border-top:1px solid hsl(var(--border));background:hsl(var(--card) / .98);box-shadow:-4px 0 24px hsl(var(--foreground) / .08);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.board-rail-explain-body{color:hsl(var(--foreground))}.board-explain-error{position:absolute;bottom:.5rem;right:3.5rem;z-index:20;max-width:14rem}