/* Тренажёр сложения и вычитания дробей с разными знаменателями. tokens-only.
   Все селекторы строго под .app--fraction-unlike-add-subtract. */

.app--fraction-unlike-add-subtract {
  position: relative;
  max-width: 56rem;
  margin: 0 auto;
  padding: var(--space-2) var(--space-4) var(--space-4);
  font-family: var(--font-body);
  color: var(--text);
  box-sizing: border-box;
}

.app--fraction-unlike-add-subtract [hidden] {
  display: none !important;
}

.app--fraction-unlike-add-subtract .fua-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Вертикальные дроби в любых текстах и подсказках */
.app--fraction-unlike-add-subtract .inline-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  margin: 0 0.25em;
  line-height: 1;
}

.app--fraction-unlike-add-subtract .inline-frac__num,
.app--fraction-unlike-add-subtract .inline-frac__den {
  display: block;
  font-size: 0.85em;
  line-height: 1.1;
  padding: 0 2px;
  font-weight: 700;
}

.app--fraction-unlike-add-subtract .inline-frac__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  margin: 1px 0;
}

.app--fraction-unlike-add-subtract .fua-confetti,
.app--fraction-unlike-add-subtract .trainer-quiz-confetti {
  pointer-events: none;
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 40;
}

.app--fraction-unlike-add-subtract .fua-confetti .cp,
.app--fraction-unlike-add-subtract .trainer-quiz-confetti .cp {
  position: absolute;
  top: -12px;
  border-radius: 2px;
  animation-name: fua-confetti-fall;
  animation-timing-function: ease-in;
  animation-fill-mode: forwards;
}

@keyframes fua-confetti-fall {
  to {
    transform: translateY(110vh) rotate(480deg);
    opacity: 0;
  }
}

.app--fraction-unlike-add-subtract .fua-exit {
  margin-bottom: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-back {
  min-height: 44px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--primary);
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}

.app--fraction-unlike-add-subtract .fua-workspace {
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
}

.app--fraction-unlike-add-subtract .fua-topbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-tab {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  min-height: 56px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface-2);
  font: inherit;
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    background 130ms ease,
    border-color 130ms ease,
    color 130ms ease;
}

.app--fraction-unlike-add-subtract .fua-tab__icon {
  flex-shrink: 0;
  font-size: var(--text-lg);
  line-height: 1;
}

.app--fraction-unlike-add-subtract .fua-tab__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app--fraction-unlike-add-subtract .fua-tab__title {
  font-family: var(--font-display);
  font-size: clamp(0.875rem, 3.2vw, 1rem);
  font-weight: 800;
  line-height: 1.2;
}

.app--fraction-unlike-add-subtract .fua-tab__sub {
  display: block;
  font-size: clamp(0.625rem, 2.4vw, 0.75rem);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-muted);
}

.app--fraction-unlike-add-subtract .fua-tab.is-active {
  background: var(--primary);
  color: var(--text-inv);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.app--fraction-unlike-add-subtract .fua-tab.is-active .fua-tab__sub {
  color: color-mix(in srgb, var(--text-inv) 85%, transparent);
}

/* Экран конфигурации */
.app--fraction-unlike-add-subtract .fua-config-head {
  margin-bottom: var(--space-4);
  text-align: center;
}

.app--fraction-unlike-add-subtract .fua-config-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 4vw, 1.45rem);
  font-weight: 800;
}

.app--fraction-unlike-add-subtract .fua-config-lead {
  margin: 0 auto;
  max-width: 36rem;
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.45;
}

.app--fraction-unlike-add-subtract .fua-kinds {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.app--fraction-unlike-add-subtract .fua-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 84px;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border);
  background: var(--surface);
  text-align: left;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    border-color 130ms ease,
    background-color 130ms ease,
    box-shadow 130ms ease;
}

.app--fraction-unlike-add-subtract .fua-card.is-active {
  border-color: var(--primary);
  background: var(--surface-2);
  box-shadow: 0 0 0 1px var(--primary);
}

.app--fraction-unlike-add-subtract .fua-card-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(0.9rem, 2.5vw, 1.05rem);
  margin-bottom: var(--space-1);
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-card-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.35;
  flex-grow: 1;
  margin-bottom: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-card-example {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.app--fraction-unlike-add-subtract .fua-start {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 20rem;
  min-height: 48px;
  margin: var(--space-2) auto 0;
  padding: 0 var(--space-4);
  border-radius: var(--radius-full);
  border: none;
  background: var(--primary);
  color: var(--text-inv);
  font: inherit;
  font-weight: 800;
  font-size: var(--text-base);
  cursor: pointer;
  touch-action: manipulation;
  box-shadow: var(--shadow-sm);
}

/* Шаги решения */
.app--fraction-unlike-add-subtract .fua-solve-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-badge {
  font-size: var(--text-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--surface-3);
  color: var(--text-muted);
}

.app--fraction-unlike-add-subtract .fua-progress-text {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-muted);
}

.app--fraction-unlike-add-subtract .fua-progress {
  height: 6px;
  background: var(--surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-progress__fill {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 200ms ease;
}

.app--fraction-unlike-add-subtract .fua-steps {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-2);
  gap: var(--space-1);
  overflow-x: auto;
}

.app--fraction-unlike-add-subtract .fua-step {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
}

.app--fraction-unlike-add-subtract .fua-step[aria-current="step"] {
  background: var(--primary);
  color: var(--text-inv);
  border-color: var(--primary);
}

.app--fraction-unlike-add-subtract .fua-step.is-done {
  border-color: var(--color-success, #16a34a);
  color: var(--color-success, #16a34a);
  background: color-mix(in srgb, var(--color-success, #16a34a) 8%, var(--surface));
}

.app--fraction-unlike-add-subtract .fua-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.1);
  font-size: 11px;
}

.app--fraction-unlike-add-subtract .fua-step[aria-current="step"] .fua-step-num {
  background: rgba(255, 255, 255, 0.25);
}

/* Layout решения: основная зона + док */
.app--fraction-unlike-add-subtract .fua-solve-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 0;
}

.app--fraction-unlike-add-subtract .fua-solve-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Плашка примера: решение дописывается прямо в строке */
.app--fraction-unlike-add-subtract .fua-problem {
  padding: var(--space-2) var(--space-3);
  background: color-mix(in srgb, #f59e0b 6%, var(--surface-2));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}

.app--fraction-unlike-add-subtract .fua-expression {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  font-size: clamp(1.25rem, 3.5vw, 1.65rem);
  font-weight: 700;
}

.app--fraction-unlike-add-subtract .fua-chain-col {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  position: relative;
}

.app--fraction-unlike-add-subtract .fua-mult-badge {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  border-radius: var(--radius-full);
  padding: 1px 6px;
  margin-bottom: 3px;
  line-height: 1.2;
}

.app--fraction-unlike-add-subtract .fua-chain-step {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-eq,
.app--fraction-unlike-add-subtract .fua-op,
.app--fraction-unlike-add-subtract .fua-question {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  font: inherit;
  font-size: inherit;
  font-weight: 700;
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-fraction {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  min-width: 2.2rem;
  line-height: 1.1;
}

.app--fraction-unlike-add-subtract .fua-fraction__num,
.app--fraction-unlike-add-subtract .fua-fraction__den,
.app--fraction-unlike-add-subtract .fua-frac-fixed-num,
.app--fraction-unlike-add-subtract .fua-frac-fixed-den {
  display: block;
  font: inherit;
  font-size: inherit;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  padding: 0 4px;
  text-align: center;
}

.app--fraction-unlike-add-subtract .fua-fraction__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  margin: 2px 0;
}

/* Контейнер сохранённых результатов предыдущих шагов (чипы выполненных этапов) */
.app--fraction-unlike-add-subtract .fua-context {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  justify-content: flex-start;
  padding: 2px 0;
  margin: 0;
}

.app--fraction-unlike-add-subtract .fua-context-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--color-success, #16a34a) 8%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--color-success, #16a34a) 35%, transparent);
  color: var(--text);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.2;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  animation: fua-chip-appear 160ms ease-out;
}

@keyframes fua-chip-appear {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.app--fraction-unlike-add-subtract .fua-context-chip__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--color-success, #16a34a);
  color: #ffffff;
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 800;
  flex-shrink: 0;
}

.app--fraction-unlike-add-subtract .fua-context-chip__text {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.app--fraction-unlike-add-subtract .fua-context-chip__text strong {
  font-weight: 800;
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-context-chip__check {
  color: var(--color-success, #16a34a);
  font-weight: 800;
  font-size: 11px;
}

/* Рабочая зона ввода текущего шага */
.app--fraction-unlike-add-subtract .fua-work {
  padding: var(--space-2) var(--space-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 0;
  justify-content: center;
}

.app--fraction-unlike-add-subtract .fua-step-prompt {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

.app--fraction-unlike-add-subtract .fua-step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--text-inv);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 800;
  flex-shrink: 0;
}

.app--fraction-unlike-add-subtract .fua-prompt {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  font-weight: 800;
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-step-instruction {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
}

.app--fraction-unlike-add-subtract .fua-field {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-sm);
}

.app--fraction-unlike-add-subtract .fua-field-label {
  color: var(--text-muted);
}

.app--fraction-unlike-add-subtract .fua-and {
  margin: 0 var(--space-2);
  color: var(--text-muted);
  font-weight: 700;
}

.app--fraction-unlike-add-subtract .fua-input {
  min-height: 44px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  transition:
    border-color 130ms ease,
    box-shadow 130ms ease;
}

.app--fraction-unlike-add-subtract .fua-input--sm {
  width: 72px;
}

.app--fraction-unlike-add-subtract .fua-input--frac {
  width: 52px;
  height: 38px;
  min-height: 38px;
  font: inherit;
  font-size: inherit;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  padding: 0 2px;
}

.app--fraction-unlike-add-subtract .fua-input.is-active,
.app--fraction-unlike-add-subtract .fua-input:focus {
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}

.app--fraction-unlike-add-subtract .fua-input.is-err {
  border-color: var(--color-danger, #dc2626) !important;
  background: color-mix(in srgb, var(--color-danger, #dc2626) 8%, var(--surface)) !important;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-danger, #dc2626) 20%, transparent) !important;
  animation: fua-input-shake 280ms ease-in-out;
}

@keyframes fua-input-shake {
  0%, 100% {
    transform: translateX(0);
  }
  20%, 60% {
    transform: translateX(-4px);
  }
  40%, 80% {
    transform: translateX(4px);
  }
}

/* Обратная связь и карточка успеха */
.app--fraction-unlike-add-subtract .fua-feedback {
  min-height: 0;
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 700;
  text-align: center;
  transition: opacity 120ms ease;
}

.app--fraction-unlike-add-subtract .fua-feedback.is-empty {
  opacity: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

.app--fraction-unlike-add-subtract .fua-feedback.is-ok {
  color: var(--color-success, #16a34a);
}

.app--fraction-unlike-add-subtract .fua-feedback.is-err {
  color: var(--color-danger, #dc2626);
}

.app--fraction-unlike-add-subtract .fua-check-notice {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

.app--fraction-unlike-add-subtract .fua-success {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-success, #16a34a) 12%, var(--surface));
  border: 1px solid var(--color-success, #16a34a);
  animation: fua-chip-appear 160ms ease-out;
  box-sizing: border-box;
}

.app--fraction-unlike-add-subtract .fua-success__content {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.app--fraction-unlike-add-subtract .fua-success__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-success, #16a34a);
  color: #ffffff;
  font-size: 13px;
  font-weight: 800;
  line-height: 1;
  margin: 0;
  flex-shrink: 0;
}

.app--fraction-unlike-add-subtract .fua-success__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-base);
  color: var(--text);
  line-height: 1.2;
}

.app--fraction-unlike-add-subtract .fua-next {
  min-height: 38px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-full);
  border: none;
  background: var(--color-success, #16a34a);
  color: #ffffff;
  font: inherit;
  font-weight: 800;
  font-size: var(--text-sm);
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 640px) {
  .app--fraction-unlike-add-subtract .fua-success {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
    padding: var(--space-2);
  }
  .app--fraction-unlike-add-subtract .fua-next {
    width: 100%;
  }
}

/* Док управления: подсказки + кнопки + numpad */
.app--fraction-unlike-add-subtract .fua-solve-dock {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.app--fraction-unlike-add-subtract:has(#fuaSuccess:not([hidden])) .fua-solve-dock {
  display: none;
}

.app--fraction-unlike-add-subtract .fua-hint-btn {
  width: 100%;
  min-height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  font-size: var(--text-xs);
  cursor: pointer;
  touch-action: manipulation;
}

.app--fraction-unlike-add-subtract .fua-hint-card {
  padding: var(--space-2) var(--space-3);
  background: color-mix(in srgb, #f59e0b 12%, var(--surface));
  border: 1px solid #f59e0b;
  border-radius: var(--radius-md);
  margin-top: var(--space-1);
}

.app--fraction-unlike-add-subtract .fua-hint-text {
  margin: 0;
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
}

.app--fraction-unlike-add-subtract .fua-check {
  width: 100%;
  min-height: 48px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--primary);
  color: var(--text-inv);
  font: inherit;
  font-weight: 800;
  font-size: var(--text-base);
  cursor: pointer;
  touch-action: manipulation;
}

.app--fraction-unlike-add-subtract .fua-another,
.app--fraction-unlike-add-subtract .fua-skip {
  width: 100%;
  min-height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-muted);
  font: inherit;
  font-weight: 700;
  font-size: var(--text-xs);
  cursor: pointer;
  touch-action: manipulation;
}

/* Numpad */
.app--fraction-unlike-add-subtract .fua-numpad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-1);
  background: var(--surface-2);
  padding: var(--space-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.app--fraction-unlike-add-subtract .fua-key {
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 80ms ease;
}

.app--fraction-unlike-add-subtract .fua-key:active {
  background: var(--surface-3);
}

.app--fraction-unlike-add-subtract .fua-key--del {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--text-muted);
  flex-direction: column;
  gap: 2px;
}

.app--fraction-unlike-add-subtract .fua-key--ok {
  background: var(--primary);
  color: var(--text-inv);
  border-color: var(--primary);
}

/* Экран итогов */
.app--fraction-unlike-add-subtract .fua-summary {
  padding: var(--space-6) var(--space-4);
  text-align: center;
}

.app--fraction-unlike-add-subtract .fua-summary__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  font-weight: 800;
}

.app--fraction-unlike-add-subtract .fua-summary__score {
  margin: 0 0 var(--space-4);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-muted);
}

.app--fraction-unlike-add-subtract .fua-summary__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  max-width: 28rem;
  margin: 0 auto var(--space-6);
  padding: 0;
}

.app--fraction-unlike-add-subtract .fua-summary__stats div {
  padding: var(--space-3);
  background: var(--surface-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.app--fraction-unlike-add-subtract .fua-summary__stats dt {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.app--fraction-unlike-add-subtract .fua-summary__stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 800;
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-summary__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Диалог подтверждения пропуска */
.app--fraction-unlike-add-subtract .fua-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 100;
}

.app--fraction-unlike-add-subtract .fua-dialog {
  max-width: 24rem;
  width: 100%;
  padding: var(--space-4);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg, 0 10px 25px rgba(0, 0, 0, 0.2));
  text-align: center;
}

.app--fraction-unlike-add-subtract .fua-dialog-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
}

.app--fraction-unlike-add-subtract .fua-dialog-text {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.45;
}

.app--fraction-unlike-add-subtract .fua-dialog-actions {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
}

.app--fraction-unlike-add-subtract .fua-dialog-btn {
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  font: inherit;
  font-weight: 700;
  font-size: var(--text-sm);
  cursor: pointer;
  touch-action: manipulation;
}

.app--fraction-unlike-add-subtract .fua-dialog-btn--cancel {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
}

.app--fraction-unlike-add-subtract .fua-dialog-btn--confirm {
  border: none;
  background: var(--color-danger, #dc2626);
  color: #ffffff;
}

/* Адаптив: десктопная рабочая область и мобильные экраны */
@media (min-width: 720px) {
  .app--fraction-unlike-add-subtract .fua-workspace {
    max-width: 48rem;
    margin-inline: auto;
  }

  .app--fraction-unlike-add-subtract .fua-tabs {
    max-width: 32rem;
    margin-inline: auto;
  }

  .app--fraction-unlike-add-subtract .fua-solve-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 0.75rem;
    align-items: start;
  }

  .app--fraction-unlike-add-subtract .fua-solve-dock {
    position: sticky;
    top: 4.5rem;
    bottom: auto;
    border-top: none;
    border-left: 1px solid var(--border);
    padding: 0 0 0 0.75rem;
    box-shadow: none;
    align-self: start;
  }
}

@media (max-width: 719px) {
  .app--fraction-unlike-add-subtract {
    padding: var(--space-1) var(--space-2) var(--space-3);
  }

  .app--fraction-unlike-add-subtract .fua-workspace {
    padding: var(--space-2);
  }

  .app--fraction-unlike-add-subtract .fua-tab {
    min-height: 48px;
    padding: var(--space-1) var(--space-2);
  }

  .app--fraction-unlike-add-subtract .fua-tab__sub {
    display: none;
  }

  .app--fraction-unlike-add-subtract .fua-back {
    min-height: 40px;
  }

  .app--fraction-unlike-add-subtract .fua-problem,
  .app--fraction-unlike-add-subtract .fua-work {
    padding: var(--space-2);
  }

  .app--fraction-unlike-add-subtract .fua-solve-dock {
    gap: 0.35rem;
    padding-top: 0.25rem;
  }

  .app--fraction-unlike-add-subtract .fua-check {
    min-height: 44px;
  }

  .app--fraction-unlike-add-subtract .fua-numpad {
    gap: 4px;
    padding: var(--space-1);
  }

  .app--fraction-unlike-add-subtract .fua-key {
    min-height: 44px;
    font-size: 1.15rem;
    border-radius: 10px;
  }

  .app--fraction-unlike-add-subtract .fua-kinds {
    grid-template-columns: 1fr;
  }

  .app--fraction-unlike-add-subtract .fua-summary__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}