.exercise-generator {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.exercise-generator h2,
.calculation-flow h2,
.values-panel h2 {
  margin: 0;
  font-family: "Bungee", sans-serif;
  line-height: 1.3;
}

.generator-actions,
.number-stepper,
.feedback-key {
  display: flex;
  align-items: center;
  gap: 12px;
}

.generator-actions {
  --generator-control-width: 230px;
}

.generator-actions > .number-stepper,
.generator-actions > .positive-only-control,
.generator-actions > .button {
  width: var(--generator-control-width);
  height: 54px;
  min-height: 54px;
  flex: 0 0 var(--generator-control-width);
}

.number-stepper {
  gap: 0;
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: 12px;
  background: var(--paper);
  box-shadow: var(--shadow-sm);
}

.number-stepper button,
.number-stepper input {
  height: 48px;
  border: 0;
  background: var(--paper);
  color: var(--ink);
  font: 800 1.1rem "Manrope", sans-serif;
  text-align: center;
}

.number-stepper button {
  width: 54px;
  flex: 0 0 54px;
}

.number-stepper input {
  width: auto;
  min-width: 0;
  flex: 1 1 auto;
}

.number-stepper button {
  cursor: pointer;
  font-size: 1.4rem;
}

.number-stepper button:first-child {
  border-right: 2px solid var(--ink);
}

.number-stepper button:last-child {
  border-left: 2px solid var(--ink);
}

.number-stepper input {
  appearance: textfield;
}

.number-stepper input::-webkit-inner-spin-button,
.number-stepper input::-webkit-outer-spin-button {
  appearance: none;
  margin: 0;
}

.positive-only-control {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 14px;
  border: 3px solid var(--ink);
  border-radius: 12px;
  background: var(--paper);
  box-shadow: var(--shadow-sm);
  font-size: 0.82rem;
  font-weight: 800;
  cursor: pointer;
}

.positive-only-control input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--amber);
}

.positive-only-control:has(input:checked) {
  background: var(--yellow-soft);
}

.positive-only-control:has(input:disabled) {
  cursor: not-allowed;
  opacity: 0.5;
}

button:disabled,
input:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.compact-heading {
  max-width: none;
  margin-bottom: 24px;
}

.dataset-scroll {
  overflow-x: auto;
  padding: 4px 4px 14px;
}

.row-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dataset-grid,
.deviations-grid {
  display: grid;
  grid-template-columns: repeat(var(--observation-count), 44px);
  gap: 6px;
  justify-content: center;
  width: max-content;
  min-width: 100%;
}

.dataset-value {
  display: grid;
  place-items: center;
  width: 44px;
  min-height: 44px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--paper);
  font-family: "Barlow Condensed", sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
}

.assumed-mean-row {
  display: grid;
  grid-template-columns: max-content minmax(90px, 150px) max-content minmax(160px, 1fr);
  gap: 12px;
  align-items: center;
  margin: 30px 0;
  padding: 16px 18px;
  border-left: 7px solid var(--amber);
  background: var(--yellow-soft);
}

.assumed-mean-row label {
  font-family: "Bungee", sans-serif;
  font-size: 0.9rem;
}

.assumed-mean-row span {
  color: var(--muted);
  font-weight: 700;
}

.assumed-mean-row input,
.deviation-field input,
.calculation-row input {
  width: 100%;
  min-height: 44px;
  padding: 6px 8px;
  border: 3px solid var(--ink);
  border-radius: 9px;
  background: var(--paper);
  color: var(--ink);
  font: 800 1rem "Manrope", sans-serif;
  text-align: center;
}

.deviation-field input {
  width: 44px;
  min-height: 44px;
  padding: 4px;
  font-family: "Barlow Condensed", sans-serif;
  font-size: 1.3rem;
  line-height: 1;
}

.assumed-mean-row input:focus,
.deviation-field input:focus,
.calculation-row input:focus {
  outline: 4px solid rgba(246, 213, 27, 0.55);
  outline-offset: 2px;
}

.reduced-row-label {
  margin-top: 0;
}

.deviation-field {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  min-width: 0;
}

.correct-value {
  min-height: 22px;
  color: #a52219;
  font-family: "Barlow Condensed", sans-serif;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1;
}

.field-feedback {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.field-feedback:empty {
  display: none;
}

.calculation-stack {
  display: grid;
  gap: 14px;
}

.calculation-row {
  display: grid;
  grid-template-columns: minmax(210px, 280px) 28px minmax(100px, 170px) minmax(220px, 1fr);
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  border-left: 7px solid var(--ink);
  background: var(--cream);
}

.calculation-row label {
  font-weight: 800;
}

.calculation-arrow {
  font-family: "Bungee", sans-serif;
  font-size: 1.25rem;
  text-align: center;
}

.check-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 3px dashed var(--ink);
}

.feedback-key {
  flex-wrap: wrap;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 800;
}

.feedback-key span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.feedback-key i {
  width: 14px;
  height: 14px;
  border: 2px solid var(--ink);
  border-radius: 4px;
}

.key-correct {
  background: #a7e8b1;
}

.key-dependent {
  background: #ffd37a;
}

.key-incorrect {
  background: #ffaaa3;
}

.exercise-status {
  flex-basis: 100%;
  margin: 0;
  font-weight: 800;
}

.result-correct input {
  border-color: #237a35;
  background: #e8f8eb;
}

.result-dependent input {
  border-color: #9a6200;
  background: #fff3cf;
}

.result-incorrect input {
  border-color: #a52219;
  background: #ffe5e2;
}

.result-correct .field-feedback {
  color: #185725;
}

.result-dependent .field-feedback {
  color: #754900;
}

.result-incorrect .field-feedback {
  color: #7d1812;
}

@media (max-width: 1050px) {
  .exercise-generator {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 800px) {
  .generator-actions {
    width: 100%;
    align-items: stretch;
    flex-direction: column;
  }

  .generator-actions > .number-stepper,
  .generator-actions > .positive-only-control,
  .generator-actions > .button {
    width: 100%;
    flex-basis: auto;
  }

  .calculation-row {
    grid-template-columns: minmax(170px, 1fr) 24px minmax(90px, 140px);
  }

  .calculation-row .field-feedback {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .assumed-mean-row {
    grid-template-columns: 1fr minmax(90px, 130px);
  }

  .assumed-mean-row span {
    grid-column: 1;
    grid-row: 2;
  }

  .assumed-mean-row .field-feedback {
    grid-column: 1 / -1;
  }

  .calculation-row {
    grid-template-columns: 1fr 24px minmax(80px, 110px);
    padding: 12px;
  }
}