/* Reserve validation space; maintain action geometry without changing the header. */
.amount-error,.amount-error:empty{display:block;min-block-size:3.6em;line-height:1.8;margin-top:5px}
#cart-validation{min-block-size:3.6em}
#contribution-total,#cart-total{min-inline-size:7ch;text-align:end;font-variant-numeric:tabular-nums}
#more-projects{min-inline-size:180px}
main button,#modal button{transition-property:background-color,color,border-color,box-shadow,opacity}
.project-actions{align-items:center}.project-actions .btn{flex:1;min-width:0}