main { max-width: 1040px; }
.equipment { padding: 15px 18px; background: #fff5df; border: 1px solid #e3c986; border-radius: 12px; }
.level-picker { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; padding: 18px; background: white; }
.level-picker .choice { justify-content: flex-start; text-align: left; gap: 10px; }
.level-picker strong { display: block; }
.level-picker p { grid-column: 1/-1; margin: 0; font-size: .9rem; color: var(--muted); }
#formula { text-align: center; padding: 18px 4px; font-size: 1.35rem; overflow-x: auto; }
#score, #fraction-help, #math-status { color: var(--muted); }
.fraction-answer { width: min(100%,350px); margin: 20px auto; }
.fraction-row { display: grid; grid-template-columns: 1fr minmax(0,140px); align-items: center; gap: 12px; }
.fraction-row input { width: 100%; min-height: 48px; padding: 10px; font: inherit; font-size: 1.1rem; text-align: center; border: 1px solid var(--border); border-radius: 8px; background: white; color: var(--text); }
.fraction-bar { width: 140px; max-width: 45%; height: 2px; background: var(--text); margin: 10px 0 10px auto; }
.correction { margin-top: 18px; padding: 18px; border: 1px solid var(--border); border-radius: 14px; }
.correction h3 { margin-top: 0; }
#steps { padding-left: 22px; }
#steps li { padding: 12px 0; overflow-x: auto; }
@media(max-width: 720px){ .level-picker { grid-template-columns: 1fr; } }
@media(max-width: 400px){ .fraction-row { grid-template-columns: 1fr minmax(0,110px); gap: 8px; } .fraction-bar { width: 110px; } }

#add-fraction { display: block; margin: 14px auto; }
#multiple-help { color: var(--muted); font-size: .9rem; }
.fraction-plus { text-align: center; font-size: 1.5rem; }
.extra-fraction .fraction-answer { margin-top: 10px; margin-bottom: 10px; }
.remove-fraction { display: block; margin: 0 auto 16px; padding: 7px 12px; font-size: .85rem; }

/* Calculatrice indépendante de la réponse à l’exercice. */
main { max-width: 1280px; }
.calculation-layout { display: grid; grid-template-columns: minmax(0,1fr) 285px; gap: 22px; align-items: start; }
.calculator-sidebar { min-width: 0; position: sticky; top: 16px; }
#calculator-form { margin-top: 18px; }
#calculator-form label { display: block; margin-bottom: 8px; font-size: .9rem; }
#calculator-input { width: 100%; padding: 12px 9px; border: 1px solid var(--border); border-radius: 8px; font: inherit; background: white; color: var(--text); }
#calculator-result { display: block; min-height: 48px; padding: 12px 0; overflow-wrap: anywhere; font-weight: 700; }
.calculator-keys { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 7px; }
.calculator-keys button { min-width: 0; min-height: 44px; padding: 9px 4px; background: #edf8fa; color: var(--text); border: 1px solid var(--border); border-radius: 8px; }
.calculator-keys .calculator-equals { grid-column: 1/-1; background: var(--ocean); color: white; }
#calculator-help { margin: 12px 0 0; font-size: .85rem; color: var(--muted); }
@media(max-width: 850px){
  .calculation-layout { grid-template-columns: minmax(0,1fr); }
  .calculator-sidebar { position: static; grid-row: 1; }
  #calculator-form { max-width: 340px; margin-inline: auto; }
}

/* Fractions sans libellés visibles, alignées lorsque la largeur le permet. */
.fraction-label { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
#fractions { display: flex; flex-wrap: wrap; justify-content: center; align-items: flex-start; gap: 18px; margin: 20px 0; }
#extra-fractions { display: contents; }
#fractions .fraction-answer { width: 140px; max-width: 100%; margin: 0; }
#fractions .fraction-row { display: block; }
#fractions .fraction-bar { width: 100%; max-width: none; margin: 10px 0; }
#fractions .extra-fraction { display: grid; grid-template-columns: 20px 140px; gap: 10px; align-items: center; max-width: 100%; }
#fractions .fraction-plus { grid-column: 1; grid-row: 1; }
#fractions .extra-fraction .fraction-answer { grid-column: 2; grid-row: 1; }
#fractions .remove-fraction { grid-column: 2; margin: 0; padding: 5px 0; font-size: .78rem; }