/* Десятичные дроби в столбик. Только .app--dec-stolbik.
   Карточка той же ширины, что текст под заголовком (48rem).
   С 921px: слева типы, справа пример, под примером кнопки и клавиатура.
   Уже — типы в списке, клавиатура под примером. */

.app--dec-stolbik.app--stolbik-trainer {
  --cell: 48px;
  width: min(48rem, calc(100% - 2 * var(--space-4, 1rem)));
  max-width: 48rem;
  padding: 12px 14px 14px;
  box-shadow: var(--trainer-shadow-card);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  row-gap: 0.45rem;
}

/* Один шаг между частями только этой страницы: заголовки 1.25rem, промежуток 1.5rem. */
.site-main--crumbs-bar .page-topic-h1 {
  padding-left: 0;
  padding-right: 0;
}

.site-main--crumbs-bar .stolbik-trainer-intro {
  margin-bottom: 0.75rem;
}

.site-main--crumbs-bar .stolbik-trainer-intro__text {
  font-size: 1rem;
  line-height: 1.55;
}

.dec-online-title {
  width: min(48rem, calc(100% - 2 * var(--space-4)));
  max-width: 48rem;
  margin: var(--space-8) auto var(--space-4);
  padding: 0;
  box-sizing: border-box;
  font-size: 1.25rem;
  line-height: 1.25;
  font-weight: 700;
  color: var(--text);
}

.page-topic-seo-after-app {
  margin-top: 1.5rem;
}

.page-topic-seo-after-app .article-prose h2,
.page-topic-seo-after-app .related-trainers .related-trainers__title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.25;
}

.page-topic-seo-after-app .article-prose h2 {
  margin: 1.5rem 0 0.65rem;
}

.page-topic-seo-after-app .article-prose p {
  font-size: 1rem;
  line-height: 1.55;
}

.page-topic-seo-after-app .related-trainers {
  margin-top: 1.5rem;
}

.page-topic-seo-after-app .stolbik-hub-nav {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
}

.app--dec-stolbik > #decConf {
  display: none;
}

/* Топбар и тело «разбираются», чтобы вкладки, список и прогресс встали в одну сетку. */
.app--dec-stolbik .stolbik-topbar,
.app--dec-stolbik .stolbik-trainer-body {
  display: contents;
}

.app--dec-stolbik .topbar {
  grid-column: 1;
  grid-row: 1;
  margin-bottom: 0;
  justify-content: flex-start;
}

.app--dec-stolbik .topbar .tabs {
  flex: 0 1 auto;
}

.app--dec-stolbik .stolbik-rail {
  grid-column: 1;
  grid-row: 2;
  position: static;
  border-bottom: 1px solid var(--br);
  padding-bottom: 0.55rem;
}

.app--dec-stolbik .stolbik-topbar__progress {
  grid-column: 1;
  grid-row: 3;
  max-width: none;
  width: 100%;
  min-height: 0;
}

.app--dec-stolbik.app--stolbik-trainer .stolbik-trainer-body > .stolbik-stage,
.app--dec-stolbik.app--stolbik-trainer .stolbik-trainer-body > [id$='-mode-check'] {
  grid-column: 1;
  grid-row: 4;
  min-width: 0;
}

.app--dec-stolbik .stolbik-step-head,
.app--dec-stolbik .ph2 {
  margin-bottom: 0;
}

.app--dec-stolbik .stolbik-step-progress,
.app--dec-stolbik .stolbik-progress {
  height: 12px;
  border-radius: 999px;
}

.app--dec-stolbik .stolbik-step-progress {
  width: 100%;
}

.app--dec-stolbik .stolbik-quiz-progress--topbar .stolbik-progress {
  flex: 1;
  margin: 0;
}

.app--dec-stolbik .stolbik-levels__panel {
  display: block;
  padding-top: 0;
}

.app--dec-stolbik .dec-op-select {
  position: relative;
  display: block;
  width: 100%;
}

.app--dec-stolbik .dec-op-select__btn,
.app--dec-stolbik .dec-op-select__list [data-dec-op] {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--t);
}

.app--dec-stolbik .dec-op-select__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 44px;
  margin: 0;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--br);
  border-radius: 12px;
  background: #fff;
  text-align: left;
}

.app--dec-stolbik .dec-op-select__btn::after {
  content: '';
  flex: 0 0 auto;
  width: 0.45rem;
  height: 0.45rem;
  margin-left: 0.75rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-0.12rem) rotate(45deg);
}

.app--dec-stolbik .dec-op-select__list {
  position: absolute;
  z-index: 30;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0.25rem 0;
  border: 1px solid var(--br);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(24, 59, 91, 0.08);
}

.app--dec-stolbik .dec-op-select__list[hidden] {
  display: none;
}

.app--dec-stolbik .dec-op-select__list [data-dec-op] {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0.55rem 0.75rem;
  border: 0;
  background: transparent;
  text-align: left;
}

.app--dec-stolbik .dec-op-select__list [data-dec-op].active {
  background: color-mix(in srgb, var(--p) 16%, #fff);
}

.app--dec-stolbik .stolbik-level-pills-wrap {
  display: none;
}

.app--dec-stolbik .stolbik-levels .prow {
  flex-direction: row;
  flex-wrap: nowrap;
  overflow-x: auto;
  margin-bottom: 0;
}

.app--dec-stolbik .pill.active {
  background: color-mix(in srgb, var(--p) 14%, #fff);
  color: var(--t);
  border-color: color-mix(in srgb, var(--p) 45%, var(--br));
}

.app--dec-stolbik .stolbik-levels .pill {
  flex: 0 0 auto;
  width: auto;
  min-height: 52px;
  padding: 10px 14px;
  border-radius: 18px;
  justify-content: center;
  white-space: nowrap;
}

/* Доска на всю рабочую зону, сами клетки — по содержимому и по центру. */
.app--dec-stolbik .stolbik-stage-layout {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.app--dec-stolbik .stolbik-stage-main {
  overflow: visible;
  width: 100%;
}

.app--dec-stolbik.app--stolbik-trainer .bw {
  width: 100%;
  justify-content: center;
  align-items: center;
  padding: 0.45rem 0.35rem 0.55rem;
  background: #fff;
  border: 1px solid #e7e3dc;
  box-shadow: none;
}

.app--dec-stolbik .stolbik-board {
  width: max-content;
  margin-inline: auto;
  background-color: #fff;
  background-image: none;
}

.app--dec-stolbik .gc {
  background: #fff;
  box-shadow: inset 0 0 0 1px #e4e0d8;
}

.app--dec-stolbik .gc:not(.wz) {
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(216, 213, 207, 0.45);
}

.app--dec-stolbik .gc.wr {
  background: #edf8f7;
  box-shadow: inset 0 0 0 2px var(--p);
}

.app--dec-stolbik .stolbik-dock {
  position: static;
  top: auto;
  bottom: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  border: none;
  padding: 0.45rem 0 0;
  box-shadow: none;
  background: transparent;
}

/* Подсказка над клавиатурой, главное действие — сразу под ней. */
.app--dec-stolbik .stolbik-learn-actions,
.app--dec-stolbik .stolbik-learn-actions__main,
.app--dec-stolbik .stolbik-learn-actions__primary,
.app--dec-stolbik .stolbik-learn-actions__secondary,
.app--dec-stolbik .stolbik-learn-actions.is-preview .stolbik-learn-actions__main {
  display: contents;
}

.app--dec-stolbik .stolbik-hint-inline {
  order: 0;
  margin-top: 0;
}

.app--dec-stolbik .stolbik-dock .btn.bo {
  order: 1;
}

.app--dec-stolbik .np {
  order: 2;
  width: 100%;
  max-width: none;
  margin: 0;
}

.app--dec-stolbik .stolbik-solve-start,
.app--dec-stolbik .stolbik-dock .btn-step {
  order: 3;
}

.app--dec-stolbik .stolbik-dock .btn-muted {
  order: 4;
}

.app--dec-stolbik .stolbik-dock .btn-new {
  order: 5;
}

.app--dec-stolbik .stolbik-skip-link {
  order: 6;
}

.app--dec-stolbik .stolbik-dock .btn,
.app--dec-stolbik .stolbik-solve-start {
  width: 100%;
  min-height: 44px;
  border-radius: 12px;
}

.app--dec-stolbik .stolbik-dock .btn.bo {
  background: color-mix(in srgb, var(--p) 10%, #fff);
  border: 1px solid color-mix(in srgb, var(--p) 22%, transparent);
  color: var(--t);
}

.app--dec-stolbik .stolbik-dock .btn-muted {
  background: #fff;
  border: 1px solid var(--br);
  color: var(--t);
  box-shadow: none;
}

.app--dec-stolbik .stolbik-dock .btn-new {
  border: 0;
  background: transparent;
  color: var(--p);
  box-shadow: none;
  min-height: 36px;
}

.app--dec-stolbik .nk {
  height: 46px;
  min-height: 44px;
  border-radius: 12px;
}

/* «Проверяем» на узком экране: 0/10, точность и время в одной строке,
   пример сразу под ней. */
@media (max-width: 920px) {
  .app--dec-stolbik .stolbik-stage,
  .app--dec-stolbik .stolbik-task-head {
    display: contents;
  }

  .app--dec-stolbik .stolbik-stage-layout {
    grid-column: 1 / -1;
    grid-row: 4;
    width: 100%;
  }

  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .topbar,
  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-rail,
  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-stage-layout,
  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-trainer-body > [id$='-mode-check'] {
    grid-column: 1 / -1;
  }

  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-topbar__progress {
    grid-column: 1;
    grid-row: 3;
    width: auto;
    max-width: none;
    align-self: center;
  }

  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-quiz-progress--topbar .stolbik-progress {
    display: none;
  }

  .app--dec-stolbik:has(.stolbik-quiz-stats:not([hidden])) .stolbik-quiz-stats {
    grid-column: 2;
    grid-row: 3;
    align-self: center;
    width: auto;
    margin: 0 0 0 0.4rem;
    justify-self: stretch;
  }
}

.app--dec-stolbik .stolbik-quiz-count {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 0.7rem;
  border: 1px solid color-mix(in srgb, var(--p) 35%, var(--br));
  border-radius: 12px;
  background: #fff;
}

.app--dec-stolbik .stolbik-quiz-stats {
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
}

.app--dec-stolbik .stolbik-stat-card {
  flex-direction: row;
  gap: 0.35rem;
  min-height: 36px;
  padding: 0.2rem 0.65rem;
  border-radius: 12px;
  background: var(--bg2);
}

/* С ширины ноутбука кнопки и клавиатура как у остальных столбиков, не столбиком друг под другом. */
@media (min-width: 721px) {
  .app--dec-stolbik .stolbik-learn-actions,
  .app--dec-stolbik .stolbik-learn-actions__main,
  .app--dec-stolbik .stolbik-learn-actions.is-preview .stolbik-learn-actions__main {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .app--dec-stolbik .stolbik-learn-actions__primary,
  .app--dec-stolbik .stolbik-learn-actions__secondary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .app--dec-stolbik .stolbik-dock .stolbik-learn-actions__primary .btn {
    min-height: 48px;
  }

  .app--dec-stolbik .stolbik-dock .stolbik-learn-actions__primary .btn.bo {
    background: var(--bg);
    border: 1.5px solid var(--p);
    color: var(--p);
  }

  .app--dec-stolbik .stolbik-dock .stolbik-learn-actions__secondary .btn-muted,
  .app--dec-stolbik .stolbik-dock .stolbik-learn-actions__secondary .btn-new {
    width: auto;
    background: transparent;
    border-color: transparent;
    color: var(--tm);
    box-shadow: none;
    min-height: 36px;
  }

  .app--dec-stolbik .nk {
    height: 56px;
    min-height: 56px;
  }
}

@media (min-width: 921px) {
  .app--dec-stolbik.app--stolbik-trainer {
    --cell: 42px;
    padding: 12px 14px 12px;
    grid-template-columns: 160px minmax(0, 1fr);
    column-gap: 12px;
    row-gap: 0;
  }

  .app--dec-stolbik .stolbik-topbar {
    display: flex;
    grid-column: 1 / -1;
    grid-row: 1;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.45rem;
  }

  .app--dec-stolbik .topbar {
    grid-column: auto;
    grid-row: auto;
    margin-bottom: 0;
    flex: 0 1 auto;
  }

  .app--dec-stolbik .dec-op-select {
    display: none;
  }

  .app--dec-stolbik .stolbik-level-pills-wrap {
    display: block;
  }

  .app--dec-stolbik .stolbik-rail {
    grid-column: 1;
    grid-row: 2;
    border-right: 1px solid var(--br);
    border-bottom: none;
    padding: 0 10px 0 0;
  }

  .app--dec-stolbik .stolbik-topbar__progress {
    grid-column: auto;
    grid-row: auto;
    flex: 1;
    max-width: 280px;
    margin-bottom: 0;
    align-self: center;
  }

  .app--dec-stolbik .stolbik-topbar .stolbik-step-head {
    flex-direction: row;
    align-items: center;
    gap: 0.65rem;
  }

  /* Пример и клавиатура — одна колонка справа от типов.
     У сцены есть свой прямоугольник: прокрутка к ней реально сдвигает страницу.
     Клавиатура липнет к низу окна, как у остальных столбиков, иначе на высоте 768px
     она остаётся ниже экрана. */
  .app--dec-stolbik.app--stolbik-trainer .stolbik-trainer-body > .stolbik-stage {
    display: flex;
    flex-direction: column;
    grid-column: 2;
    grid-row: 2 / 5;
    min-width: 0;
  }

  .app--dec-stolbik .stolbik-stage-layout {
    display: flex;
    flex-direction: column;
    min-width: 0;
  }

  .app--dec-stolbik .stolbik-task-head {
    margin-bottom: 0;
  }

  .app--dec-stolbik .stolbik-task-head:has(.stolbik-quiz-stats[hidden]) {
    display: none;
  }

  .app--dec-stolbik .stolbik-stage-main {
    min-width: 0;
  }

  .app--dec-stolbik .stolbik-rail {
    grid-row: 2 / 5;
    align-self: start;
  }

  .app--dec-stolbik .stolbik-dock {
    position: sticky;
    bottom: 0;
    z-index: 6;
    border-left: none;
    border-top: 1px solid var(--br);
    padding: 0.35rem 0 0;
    width: auto;
    background: var(--bg, #fff);
    box-shadow: 0 -8px 24px rgba(30, 40, 60, 0.06);
  }

  .app--dec-stolbik.app--stolbik-trainer .stolbik-trainer-body > [id$='-mode-check'] {
    grid-column: 2;
    grid-row: 3;
  }

  .app--dec-stolbik .stolbik-levels .prow {
    flex-direction: column;
    overflow-x: visible;
    gap: 6px;
  }

  .app--dec-stolbik .stolbik-levels .pill {
    width: 100%;
    min-height: 0;
    padding: 8px 12px;
    border-radius: 14px;
    white-space: normal;
  }
}

@media (max-width: 480px) {
  .app--dec-stolbik.app--stolbik-trainer {
    --cell: clamp(34px, 10vw, 44px);
  }
}

.app--dec-stolbik .sc.is-operand-a,
.app--dec-stolbik .sc.is-operand-b {
  font-size: calc(var(--cell) * 0.58);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.app--dec-stolbik .sc.is-operand-a {
  color: var(--cd);
}

.app--dec-stolbik .sc.is-operand-b {
  color: var(--cv);
}

.app--dec-stolbik .sc.is-op-sign {
  color: var(--tm);
  font-weight: 900;
  font-size: calc(var(--cell) * 0.5);
}

/* Запятая на правой границе клетки единиц, без отдельного столбца. */
.app--dec-stolbik .gc.is-comma {
  z-index: 2;
}

.app--dec-stolbik .gc.is-comma::before {
  content: ',';
  position: absolute;
  left: 100%;
  bottom: 16%;
  transform: translateX(-55%);
  z-index: 3;
  pointer-events: none;
  /* У Nunito жирная запятая без хвоста. Антика оставляет крючок. */
  font-family: Georgia, 'Times New Roman', 'Noto Serif', serif;
  font-weight: 700;
  font-size: calc(var(--cell) * 0.78);
  line-height: 1;
  color: var(--t);
}

.app--dec-stolbik .sc.is-result-digit {
  color: var(--cq);
  font-weight: 900;
}

.app--dec-stolbik .dec-minuend-base.is-crossed {
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  opacity: 0.55;
}

.app--dec-stolbik .dec-borrow-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.04em;
  width: 100%;
  height: 100%;
}

.app--dec-stolbik .sc.is-carry,
.app--dec-stolbik .sc.is-minuend-replace,
.app--dec-stolbik .sc.is-minuend-effective,
.app--dec-stolbik .si.is-carry,
.app--dec-stolbik .si.is-minuend-replace,
.app--dec-stolbik .si.is-minuend-effective {
  color: var(--cr);
}

.app--dec-stolbik .sc.dec-edit-mark,
.app--dec-stolbik .si.dec-edit-mark {
  font-size: calc(var(--cell) * 0.36);
  line-height: 1;
  color: var(--cr);
  font-weight: 800;
}

.app--dec-stolbik .gc.dec-edit-cell {
  background: color-mix(in srgb, var(--cr) 8%, transparent);
}

.app--dec-stolbik .gc.dec-edit-cell.wr,
.app--dec-stolbik .gc.dec-pair-cell.wr {
  background: color-mix(in srgb, var(--cr) 14%, transparent);
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--cr) 30%, transparent);
}

.app--dec-stolbik .si.is-result-digit {
  color: var(--cq);
  font-weight: 900;
}