/* class7-math-ch4-formulas.css - Chapter 4 Tier 3 "Formulas from Real Situations"
   (fmLaddu, fmTerms, fmPerim, fmPipe, fmNotes, fmMenu, fmFlags, fmSnail, fmCycle, fmTrain).
   Almost everything is shared (class7-math-ch2-common.css + class7-math-ch4-common.css); only Tier 3 touches live here. */
/* flag counter: the two circles blend where they overlap, so "both" really looks like the shared part */
.c72-overlay[id^="fmflags"] .c72-svg circle { mix-blend-mode: multiply; }
/* the regular shapes and the train track get a soft shadow */
.c72-overlay[id^="fmperim"] .c72-svg polygon { filter: drop-shadow(0 4px 3px rgba(86, 67, 160, .22)); }
.c72-overlay[id^="fmtrain"] .c72-svg line { filter: drop-shadow(0 2px 1.5px rgba(86, 67, 160, .2)); }