/* class7-math-ch2-expr.css - shared by Tier 6 (brackets2) and Tier 7 (terms2).
   The soft dashed / solid bubbles drawn round a bracket or a term pop in when the answer is shown. */
.c72-svg .c72-bubble { transform-box: fill-box; transform-origin: 50% 50%; }
.c72-revealed .c72-svg .c72-bubble { animation: c72x-pop .45s cubic-bezier(.2, 1.4, .4, 1) both; }
@keyframes c72x-pop { from { opacity: 0; transform: scale(.82); } to { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { .c72-revealed .c72-svg .c72-bubble { animation: none; } }