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(max-width:480px){.page-title{font-size:1.8rem}.mode-btn{flex:1;min-width:0;text-align:center}.calculator-actions{flex-direction:column}.btn-calculate,.btn-secondary{width:100%}.age-value{font-size:3.5rem}.breakdown-value{font-size:2rem}.milestones-grid{grid-template-columns:1fr}}