.number-fill-shell {
  width: min(100%, 1040px);
  height: 100%;
  min-height: 0;
  align-self: stretch;
  container: number-fill-shell / inline-size;
}

.number-fill-layout {
  width: 100%;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(230px, 320px);
  gap: clamp(12px, 2.5vw, 24px);
  align-items: start;
}

.number-fill-board-panel {
  min-width: 0;
  display: grid;
  gap: clamp(8px, 1.6vw, 14px);
  justify-items: center;
}

.number-fill-board {
  width: min(100%, 680px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(var(--number-fill-dimension), minmax(0, 1fr));
  grid-template-rows: repeat(var(--number-fill-dimension), minmax(0, 1fr));
  gap: 2px;
  padding: 2px;
  border: 2px solid var(--text);
  border-radius: 12px;
  background: var(--text);
  overflow: hidden;
  container-type: inline-size;
}

.number-fill-cell {
  min-width: 0;
  min-height: 0;
  border: 0;
  border-radius: 2px;
  font: inherit;
}

.number-fill-cell.is-block {
  display: block;
  background: var(--text);
}

button.number-fill-cell.is-open {
  position: relative;
  display: grid;
  place-items: center;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background .12s ease, box-shadow .12s ease, transform .12s ease;
}

button.number-fill-cell.is-open:hover {
  box-shadow: inset 0 0 0 2px var(--game-accent, var(--product-puzzles));
}

button.number-fill-cell.is-open:focus-visible {
  z-index: 4;
  outline: 3px solid var(--game-accent-2, var(--brand-aqua));
  outline-offset: -3px;
}

.number-fill-digit {
  font-size: clamp(.72rem, 8.5cqw, 1.55rem);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

button.number-fill-cell.is-selected-slot {
  z-index: 1;
  background: var(--game-accent, var(--product-puzzles));
  color: var(--text);
}

button.number-fill-cell.is-hint {
  z-index: 2;
  box-shadow: inset 0 0 0 3px var(--game-accent-2, var(--brand-aqua));
}

button.number-fill-cell.is-dead,
button.number-fill-cell.is-error {
  z-index: 3;
  box-shadow: inset 0 0 0 3px var(--danger, #B42318);
}

button.number-fill-cell.is-error {
  animation: number-fill-error .22s ease-in-out 2 alternate;
}

.number-fill-instructions {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
  font-size: clamp(.78rem, 2.4vw, .92rem);
  line-height: 1.45;
  text-align: center;
}

.number-fill-entry-panel {
  min-width: 0;
  max-height: min(68vh, 640px);
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.number-fill-entry-heading {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.number-fill-entry-heading strong {
  font-size: 1rem;
}

.number-fill-entry-heading span {
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.35;
}

.number-fill-entry-group {
  padding: 10px 12px 12px;
  border-bottom: 1px solid var(--line);
}

.number-fill-entry-group:last-child {
  border-bottom: 0;
}

.number-fill-entry-group.is-relevant {
  box-shadow: inset 4px 0 0 var(--game-accent, var(--product-puzzles));
}

.number-fill-entry-group h3 {
  margin: 0 0 7px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.number-fill-entry-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.number-fill-entry {
  min-width: 0;
  min-height: 42px;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: clamp(.82rem, 1.3vw, .96rem);
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  touch-action: manipulation;
  transition: border-color .12s ease, background .12s ease, transform .12s ease, opacity .12s ease;
}

.number-fill-entry:not(:disabled):hover {
  border-color: var(--game-accent, var(--product-puzzles));
  transform: translateY(-1px);
}

.number-fill-entry:focus-visible {
  outline: 3px solid var(--game-accent-2, var(--brand-aqua));
  outline-offset: 1px;
}

.number-fill-entry.is-current {
  border-color: var(--game-accent, var(--product-puzzles));
  background: var(--game-accent, var(--product-puzzles));
}

.number-fill-entry.is-used {
  opacity: .42;
  text-decoration: line-through;
  cursor: default;
}

.number-fill-entry.is-incompatible {
  opacity: .46;
}

.number-fill-entry.is-hint {
  border-color: var(--game-accent-2, var(--brand-aqua));
  box-shadow: inset 0 0 0 2px var(--game-accent-2, var(--brand-aqua));
}

.number-fill-entry-empty {
  grid-column: 1 / -1;
  margin: 2px 0;
  color: var(--danger, #B42318);
  font-size: .82rem;
  line-height: 1.4;
}

.number-fill-shell.is-complete .number-fill-board {
  border-color: var(--game-accent, var(--product-puzzles));
}

@keyframes number-fill-error {
  from { transform: scale(1); }
  to { transform: scale(.94); }
}

@container number-fill-shell (max-width: 760px) {
  .number-fill-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .number-fill-board {
    width: min(100%, 620px);
    border-radius: 9px;
  }

  .number-fill-entry-panel {
    width: 100%;
    max-height: min(38vh, 360px);
    scrollbar-gutter: auto;
  }

  .number-fill-entry-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .number-fill-entry {
    min-height: 44px;
    padding-inline: 5px;
    font-size: clamp(.78rem, 3.4vw, .94rem);
  }
}

@container number-fill-shell (max-width: 420px) {
  .number-fill-entry-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .number-fill-entry-panel {
    border-radius: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  button.number-fill-cell.is-open,
  .number-fill-entry {
    transition: none;
  }

  button.number-fill-cell.is-error {
    animation: none;
  }
}