- Nunito font replacing Plus Jakarta Sans
- SButton: Stack-based 3D pressable (dark shadow layer + top layer translates on press)
- SCard: flat border-based selection, no shadows
- SProgressBar: 4px thin bar, animated fill
- All screens: white bg, no gradients
- Duolingo layout: illustration top zone, content below, sticky button
- splash → intro → 5-step quiz → result screen
- Plus Jakarta Sans typography, indigo brand system
- animated quiz rows, multi-select concerns, progress bar
- Shaynee mascot reveal on result screen only
- flutter_animate for all transitions
