/* Тренажёр смешанных чисел. tokens-only. Все селекторы под .app--mixed-number. */
.app--mixed-number {
  position: relative;
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--space-4) var(--space-4) 0;
  font-family: var(--font-body);
  color: var(--text);
}

.app--mixed-number [hidden] {
  display: none !important;
}

.app--mixed-number .mna-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.app--mixed-number .mna-confetti {
  pointer-events: none;
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 40;
}

.app--mixed-number .mna-confetti .cp {
  position: absolute;
  top: -12px;
  border-radius: 2px;
  animation-name: mna-confetti-fall;
  animation-timing-function: ease-in;
  animation-fill-mode: forwards;
}

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

.app--mixed-number .mna-workspace {
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
}

.app--mixed-number .mna-tabs,
.app--mixed-number .mna-ops {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin: 0 auto var(--space-4);
}

.app--mixed-number .mna-tab,
.app--mixed-number .mna-op,
.app--mixed-number .mna-hint-btn,
.app--mixed-number .mna-another,
.app--mixed-number .mna-skip,
.app--mixed-number .mna-next {
  min-height: 44px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 800;
  cursor: pointer;
  touch-action: manipulation;
}

.app--mixed-number .mna-tab,
.app--mixed-number .mna-op {
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
}

.app--mixed-number .mna-tab.is-active,
.app--mixed-number .mna-op.is-active {
  border-color: var(--primary);
  background: var(--primary);
  color: var(--text-inv);
}

.app--mixed-number .mna-solve-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.app--mixed-number .mna-work {
  padding: var(--space-4);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
}

.app--mixed-number .mna-expression {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(0.35rem, 1.6vw, 0.9rem);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1;
}

.app--mixed-number .mna-mixed,
.app--mixed-number .mna-answer {
  display: inline-flex;
  align-items: center;
  gap: 0.2em;
}

.app--mixed-number .mna-fraction {
  display: inline-grid;
  grid-template-rows: auto auto;
  justify-items: center;
  min-width: 1.2em;
  line-height: 1;
}

.app--mixed-number .mna-fraction__num {
  padding-bottom: 0.08em;
}

.app--mixed-number .mna-fraction__den {
  border-top: 0.08em solid currentColor;
  padding-top: 0.08em;
}

.app--mixed-number .mna-input {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.12em;
  min-width: 1.8em;
  line-height: 1;
}

.app--mixed-number .mna-input__line {
  display: block;
  width: 1.7em;
  height: 0.09em;
  border-radius: 2px;
  background: currentColor;
}

.app--mixed-number .mna-whole-input,
.app--mixed-number .mna-input input {
  width: 1.6em;
  min-height: 1.15em;
  padding: 0;
  border: 0;
  border-bottom: 0.08em solid var(--primary);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 800;
  text-align: center;
}

.app--mixed-number .mna-input input {
  box-sizing: border-box;
  width: 1.7em;
  height: 1.35em;
  border: 0.08em solid var(--border);
  border-radius: 0.2em;
  background: var(--surface);
}

.app--mixed-number .mna-whole-input.is-active {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.app--mixed-number .mna-input input.is-active {
  outline: none;
  border-color: var(--primary);
}

.app--mixed-number .mna-whole-input.is-ok,
.app--mixed-number .mna-input.is-ok input,
.app--mixed-number .mna-input.is-ok {
  color: var(--ok, #15803d);
}

.app--mixed-number .mna-whole-input.is-bad,
.app--mixed-number .mna-input.is-bad {
  color: var(--danger, #b91c1c);
}

.app--mixed-number .mna-whole-input.is-warn,
.app--mixed-number .mna-input.is-warn {
  color: var(--warning, #b45309);
}

.app--mixed-number .mna-reduce-note,
.app--mixed-number .mna-feedback,
.app--mixed-number .mna-reveal__text {
  margin: var(--space-3) 0 0;
  text-align: center;
}

.app--mixed-number .mna-feedback.is-bad {
  color: var(--danger, #b91c1c);
  font-weight: 700;
}

.app--mixed-number .mna-feedback.is-warn {
  color: var(--warning, #b45309);
  font-weight: 700;
}

.app--mixed-number .mna-success,
.app--mixed-number .mna-reveal {
  margin-top: var(--space-3);
  text-align: center;
}

.app--mixed-number .mna-success__icon {
  margin: 0;
  font-size: 1.5rem;
  color: var(--ok, #15803d);
}

.app--mixed-number .mna-success__title,
.app--mixed-number .mna-summary__label {
  margin: 0 0 var(--space-3);
}

.app--mixed-number .mna-next {
  border: 0;
  background: var(--primary);
  color: var(--text-inv);
  padding: 0.7rem 1.2rem;
}

.app--mixed-number .mna-hint-btn,
.app--mixed-number .mna-another,
.app--mixed-number .mna-skip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.45rem 0.9rem;
}

.app--mixed-number .mna-hint-btn {
  position: relative;
}

.app--mixed-number .mna-hint-badge {
  position: absolute;
  top: 0;
  right: 0;
  transform: translate(40%, -45%);
  min-width: 1.25rem;
  height: 1.25rem;
  border-radius: 999px;
  background: var(--primary);
  color: var(--surface);
  font-size: 0.75rem;
  line-height: 1.25rem;
  text-align: center;
}

.app--mixed-number .mna-hint {
  max-width: 40rem;
  margin: var(--space-3) auto 0;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 650;
  line-height: 1.5;
}

.app--mixed-number .mna-hint-item {
  white-space: pre-line;
}

.app--mixed-number .mna-hint-item + .mna-hint-item {
  margin-top: 0.65rem;
}

.app--mixed-number .mna-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.app--mixed-number .mna-numpad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  max-width: 16rem;
}

.app--mixed-number .mna-key {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  font-size: 1.15rem;
  cursor: pointer;
  touch-action: manipulation;
}

.app--mixed-number .mna-key--ok {
  grid-column: 1 / -1;
  background: var(--primary);
  color: var(--text-inv);
  border-color: var(--primary);
}

.app--mixed-number .mna-key--frac {
  font-size: 0.82rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
  background: var(--color-print);
  color: var(--text);
  border-color: #c56a2e;
}

.app--mixed-number .mna-key--frac.is-active {
  background: #9a3412;
  color: var(--text-inv);
  border-color: #9a3412;
}

.app--mixed-number .mna-key--frac:disabled {
  background: var(--surface-offset);
  color: var(--text-muted);
  border-color: var(--border);
}

.app--mixed-number .mna-summary__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.app--mixed-number .mna-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  background: rgba(30, 41, 59, 0.35);
  padding: var(--space-4);
}

.app--mixed-number .mna-dialog {
  width: min(100%, 22rem);
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}

.app--mixed-number .mna-dialog-title {
  margin: 0 0 var(--space-2);
}

.app--mixed-number .mna-dialog-text {
  margin: 0 0 var(--space-4);
  color: var(--text-muted);
}

.app--mixed-number .mna-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.app--mixed-number .check-live {
  margin-top: 0.85rem;
}

@media (min-width: 720px) {
  .app--mixed-number .mna-workspace {
    max-width: 48rem;
    margin-inline: auto;
  }

  .app--mixed-number .mna-solve-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }

  .app--mixed-number .mna-solve-dock {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: sticky;
    top: 4.5rem;
    border-left: 1px solid var(--border);
    padding-left: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .app--mixed-number .mna-confetti {
    display: none;
  }
}