/* class7-math-ch4-letters.css - Chapter 4 Tier 1 "What is a letter-number?" (ltAge, ltChoose, ltSort, ltVocab, ltReverse).
   Almost everything is shared (class7-math-ch2-common.css + class7-math-ch4-common.css); only Tier 1 touches live here. */
/* the age gap machine keeps its two kid names small and calm above the cards */
.c72-overlay[id^="ltage"] .c72-svg .c72-soft,
.c72-overlay[id^="ltreverse"] .c72-svg .c72-soft { font-size: 14px; letter-spacing: .2px; }
/* the three lights on the machine blink a little slower, so little eyes can follow them */
.c72-overlay[id^="ltage"] .c72-svg .c72-light { animation-duration: 1.8s; }