/**
 * Калькулятор НОД и НОК.
 * Визуал шагов — копия тренажёра (.nn-*), все селекторы под .app--nod-nok-calc.
 */
.app--nod-nok-calc {
  position: relative;
  max-width: 72rem;
  margin: 0 auto;
  padding: var(--space-2) var(--space-4) var(--space-8);
  font-family: var(--font-body);
  color: var(--text);
}

.app--nod-nok-calc [hidden] {
  display: none !important;
}

.app--nod-nok-calc .nn-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--nod-nok-calc .nn-topbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.app--nod-nok-calc .nn-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.app--nod-nok-calc .nn-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;
}

.app--nod-nok-calc .nn-tab__icon {
  flex-shrink: 0;
  font-size: var(--text-lg);
  line-height: 1;
}

.app--nod-nok-calc .nn-tab__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app--nod-nok-calc .nn-tab__title {
  font-family: var(--font-display);
  font-size: clamp(0.875rem, 3.2vw, 1rem);
  font-weight: 800;
  line-height: 1.2;
}

.app--nod-nok-calc .nn-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--nod-nok-calc .nn-tab.is-active {
  background: var(--primary);
  color: var(--text-inv);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.app--nod-nok-calc .nn-tab.is-active .nn-tab__sub {
  color: color-mix(in srgb, var(--text-inv) 85%, transparent);
}

.app--nod-nok-calc .nnc-toolbar {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
}

.app--nod-nok-calc .nn-tabs {
  width: 100%;
}

.app--nod-nok-calc .nn-solve {
  margin-block: 0 var(--space-2);
}

.app--nod-nok-calc .nnc-top {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.app--nod-nok-calc .nn-problem {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-2);
  text-align: center;
}

.app--nod-nok-calc .nn-problem-lead {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-muted);
}

.app--nod-nok-calc .nn-solve-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.5vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
}

.app--nod-nok-calc .nnc-answer {
  justify-content: center;
}

.app--nod-nok-calc .nnc-inputs {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-2);
  align-items: end;
  width: 100%;
  max-width: 28rem;
}

.app--nod-nok-calc .nnc-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
  font-size: var(--text-xs, 0.75rem);
  font-weight: 700;
  color: var(--text-muted);
}

.app--nod-nok-calc .nnc-field input {
  width: 100%;
  box-sizing: border-box;
  min-height: 52px;
  padding: 0.4em 0.5em;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  font: inherit;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
}

.app--nod-nok-calc .nnc-field input:focus {
  outline: 3px solid var(--primary-bg);
  border-color: var(--primary);
}

.app--nod-nok-calc .nnc-field input::placeholder {
  color: transparent;
  opacity: 0;
}

.app--nod-nok-calc .nnc-sep {
  padding-bottom: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
}

.app--nod-nok-calc .nnc-actions {
  justify-content: center;
  width: 100%;
}

.app--nod-nok-calc .nn-dock {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.5rem;
}

.app--nod-nok-calc .nn-check,
.app--nod-nok-calc .nn-topics {
  min-height: 44px;
  padding: 0.45em 0.9em;
  border-radius: var(--radius-lg);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.app--nod-nok-calc .nn-check {
  border: 0;
  background: var(--primary);
  color: var(--text-inv);
}

.app--nod-nok-calc .nn-topics {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.app--nod-nok-calc .nn-feedback {
  min-height: 1.5em;
  margin: 0;
  font-weight: 700;
}

.app--nod-nok-calc .nn-feedback.is-bad {
  color: var(--error);
}

.app--nod-nok-calc .nn-board {
  margin-bottom: 0;
}

.app--nod-nok-calc .nn-step {
  margin-bottom: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.app--nod-nok-calc .nn-step:last-child {
  margin-bottom: 0;
}

.app--nod-nok-calc .nn-step.is-done {
  border-color: var(--success);
  background: var(--success-bg);
}

.app--nod-nok-calc .nn-step-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.app--nod-nok-calc .nn-step-label {
  margin: 0;
  font-size: 1.05rem;
}

.app--nod-nok-calc .nn-step-status {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--success);
}

.app--nod-nok-calc .nn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.app--nod-nok-calc .nn-label {
  font-weight: 800;
  min-width: 3.5rem;
}

.app--nod-nok-calc .nn-slots,
.app--nod-nok-calc .nn-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.app--nod-nok-calc .nn-op {
  color: var(--text-muted);
  font-weight: 800;
}

.app--nod-nok-calc .nn-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  min-height: 44px;
  text-align: center;
  font: inherit;
  font-weight: 800;
  font-size: 1.15rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.app--nod-nok-calc .nn-slot--wide {
  width: 5.5rem;
}

.app--nod-nok-calc .nn-slot.is-filled {
  border-color: var(--success);
  background: var(--success-bg);
}

.app--nod-nok-calc .nn-slot.is-locked {
  cursor: default;
}

.app--nod-nok-calc .nn-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0.35em 0.7em;
  border-radius: var(--radius-full);
  border: 2px solid var(--border);
  background: var(--primary-bg);
  font: inherit;
  font-weight: 800;
}

.app--nod-nok-calc .nn-chip[data-side='b'] {
  background: var(--success-bg);
}

.app--nod-nok-calc .nn-chip.is-on {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-bg);
}

.app--nod-nok-calc .nn-chip.is-locked {
  cursor: default;
}

.app--nod-nok-calc .nn-eq {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  margin: 0 0 var(--space-3);
}

.app--nod-nok-calc .nn-verify {
  font-weight: 700;
}

.app--nod-nok-calc .nn-verify p {
  margin: 0 0 var(--space-2);
}

.app--nod-nok-calc .nnc-dialog {
  /* reset * { margin: 0 } ломает центрирование нативного dialog */
  margin: auto;
  inset: 0;
  max-width: min(36rem, calc(100vw - 24px));
  width: min(36rem, calc(100vw - 24px));
  max-height: min(calc(100dvh - 2rem), 90vh);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  background: var(--surface);
  color: var(--text);
  overflow: auto;
  box-shadow: var(--shadow-md, 0 24px 48px color-mix(in srgb, var(--text) 18%, transparent));
}

.app--nod-nok-calc .nnc-dialog[open] {
  display: flex;
  flex-direction: column;
}

.app--nod-nok-calc .nnc-dialog::backdrop {
  background: color-mix(in srgb, var(--text) 45%, transparent);
}

.app--nod-nok-calc .nnc-dialog__head {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5);
  border-bottom: 1px solid var(--border);
}

.app--nod-nok-calc .nnc-dialog__head h2 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.app--nod-nok-calc .nnc-dialog__head p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.app--nod-nok-calc .nnc-rules {
  margin: 0;
  padding: var(--space-5) var(--space-5) var(--space-5) 1.75rem;
  line-height: 1.55;
}

.app--nod-nok-calc .nnc-rules li + li {
  margin-top: var(--space-3);
}

@media (min-width: 720px) {
  .app--nod-nok-calc .nn-workspace {
    max-width: 48rem;
    margin-inline: auto;
  }

  .app--nod-nok-calc .nn-topbar {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
  }

  .app--nod-nok-calc .nn-tabs {
    max-width: 32rem;
    flex: 1 1 auto;
  }

  .app--nod-nok-calc .nnc-toolbar {
    flex: 0 0 auto;
    min-width: 9.5rem;
  }

  .app--nod-nok-calc .nn-problem {
    max-width: 28rem;
    width: 100%;
    margin-inline: auto;
  }

  .app--nod-nok-calc .nnc-top {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .app--nod-nok-calc .nn-board {
    width: fit-content;
    max-width: 100%;
    margin-inline: auto;
  }

  .app--nod-nok-calc .nn-step {
    width: fit-content;
    max-width: 100%;
    min-width: min(100%, 20rem);
  }
}

@media (max-width: 719px) {
  .app--nod-nok-calc .nnc-top {
    grid-template-columns: 1fr;
  }

  .app--nod-nok-calc .nnc-inputs {
    grid-template-columns: 1fr;
  }

  .app--nod-nok-calc .nnc-sep {
    display: none;
  }
}