.puzzle-game {
  --puzzle-accent: #6ff5cc;
  --puzzle-ink: #ecf5ff;
  --puzzle-muted: #a5b7cd;
  --puzzle-line: #33465d;
  --puzzle-panel: #182638;
  --puzzle-deep: #0c1727;
  display: grid;
  gap: 0.85rem;
  width: 100%;
  min-width: 0;
  justify-items: center;
  color: var(--puzzle-ink);
}

.puzzle-game button {
  min-width: 0;
}

.puzzle-game button:focus-visible,
.puzzle-game select:focus-visible,
.puzzle-game [tabindex="0"]:focus-visible {
  outline: 2px solid var(--puzzle-accent);
  outline-offset: 2px;
}

.puzzle-tools {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: 0.45rem;
  min-width: 0;
}

.puzzle-tools .button,
.sudoku-pad .button {
  padding: 0.5rem 0.75rem;
  min-height: 44px;
  line-height: 1.15;
}

.puzzle-tools .button[aria-pressed="true"] {
  box-shadow: inset 0 0 0 2px var(--puzzle-accent);
  color: var(--puzzle-accent);
}

.puzzle-game button:disabled {
  cursor: default;
  opacity: 0.48;
}

.puzzle-board {
  display: grid;
  justify-items: center;
  gap: 0.65rem;
  min-width: 0;
  width: 100%;
}

.puzzle-help,
.puzzle-status {
  margin: 0;
  text-align: center;
  font-size: 0.875rem;
  line-height: 1.45;
}

.puzzle-help {
  color: var(--puzzle-muted);
}

.puzzle-status {
  min-height: 1.3em;
  color: var(--puzzle-accent);
  font-weight: 650;
}

.puzzle-choice,
.puzzle-meter {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--puzzle-line);
  border-radius: 0.6rem;
  background: var(--puzzle-deep);
  color: var(--puzzle-muted);
  font-size: 0.8rem;
  font-weight: 650;
}

.puzzle-choice select {
  color: var(--puzzle-ink);
  background: var(--puzzle-panel);
  border: 1px solid var(--puzzle-line);
  padding: 0.3rem;
  border-radius: 0.35rem;
  font: inherit;
  max-width: 100%;
}

.puzzle-meter strong {
  color: var(--puzzle-ink);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.sudoku-grid,
.merge-grid,
.slider-grid,
.lights-grid {
  box-sizing: border-box;
  direction: ltr;
  display: grid;
  width: min(100%, 26rem);
  aspect-ratio: 1;
  background: var(--puzzle-deep);
}

.sudoku-grid {
  grid-template: repeat(9, minmax(0, 1fr)) / repeat(9, minmax(0, 1fr));
  border: 2px solid #6b829e;
  border-radius: 0.7rem;
  overflow: hidden;
}

.sudoku-cell,
.puzzle-key,
.slider-tile,
.lights-tile,
.solitaire-card {
  display: grid;
  place-items: center;
  box-sizing: border-box;
  padding: 0;
  font: inherit;
  font-weight: 750;
  color: var(--puzzle-ink);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
}

.sudoku-cell {
  position: relative;
  background: #111e2f;
  color: #7ef8dc;
  border: 0;
  border-bottom: 1px solid var(--puzzle-line);
  border-right: 1px solid var(--puzzle-line);
  font-size: clamp(0.86rem, 4.2vw, 1.4rem);
}

.sudoku-cell:nth-child(9n) { border-right: 0; }
.sudoku-cell:nth-last-child(-n + 9) { border-bottom: 0; }
.sudoku-cell.sudoku-row-end { border-bottom: 2px solid #6b829e; }
.sudoku-cell.sudoku-column-end { border-right: 2px solid #6b829e; }
.sudoku-cell.is-fixed { color: #f1f5fd; background: #1a2a40; }
.sudoku-cell.is-related { background: #1d3548; }
.sudoku-cell.is-same { background: #25465a; }
.sudoku-cell.is-conflict { background: #512541; color: #ffb0c7; }
.sudoku-cell.is-selected { box-shadow: inset 0 0 0 2px var(--puzzle-accent); z-index: 1; }
.puzzle-game .sudoku-cell:focus-visible { outline-offset: -4px; }

.sudoku-notes {
  width: 93%;
  height: 93%;
  display: grid;
  place-items: center;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
  color: #c5d6e9;
  font-size: clamp(0.4rem, 1.8vw, 0.7rem);
  font-weight: 600;
  line-height: 1;
}

.sudoku-pad,
.merge-pad {
  direction: ltr;
  display: grid;
  width: min(100%, 26rem);
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 0.3rem;
}

.sudoku-pad .button {
  grid-column: 1 / -1;
  justify-self: center;
}

.puzzle-key {
  min-height: 42px;
  border: 1px solid #47617d;
  border-radius: 0.5rem;
  background: #203651;
  font-size: 1rem;
}

.puzzle-key:hover:not(:disabled),
.slider-tile.is-movable:hover {
  border-color: var(--puzzle-accent);
  background: #285363;
}

.merge-grid,
.slider-grid,
.lights-grid {
  padding: 0.42rem;
  gap: 0.42rem;
  border: 1px solid var(--puzzle-line);
  border-radius: 0.8rem;
  grid-template: repeat(4, minmax(0, 1fr)) / repeat(4, minmax(0, 1fr));
}

.merge-grid {
  touch-action: none;
}

.merge-tile {
  display: grid;
  place-items: center;
  border-radius: 0.5rem;
  background: #233852;
  color: #f4ffff;
  font-size: clamp(1rem, 6vw, 2rem);
  font-weight: 850;
  font-variant-numeric: tabular-nums;
  user-select: none;
}

.merge-tile[data-value="0"] { background: #172538; }
.merge-tile[data-value="2"] { background: #30516e; }
.merge-tile[data-value="4"] { background: #266067; }
.merge-tile[data-value="8"] { background: #19626a; }
.merge-tile[data-value="16"] { background: #2d617f; }
.merge-tile[data-value="32"] { background: #625199; }
.merge-tile[data-value="64"] { background: #854e8f; }
.merge-tile[data-value="128"] { background: #a1496a; }
.merge-tile[data-value="256"] { background: #a95242; }
.merge-tile[data-value="512"] { background: #a56139; }
.merge-tile[data-value="1024"] { background: #7b6940; }
.merge-tile[data-value="2048"] { background: #66f2c5; color: #112637; }
.merge-tile[data-value="4096"],
.merge-tile[data-value="8192"] { background: #b9a1ff; color: #1b1935; }

.merge-pad {
  width: min(100%, 14rem);
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.slider-grid[data-size="3"] { grid-template: repeat(3, minmax(0, 1fr)) / repeat(3, minmax(0, 1fr)); }
.slider-grid[data-size="5"],
.lights-grid { grid-template: repeat(5, minmax(0, 1fr)) / repeat(5, minmax(0, 1fr)); }

.slider-tile,
.lights-tile {
  border: 1px solid #3a5473;
  border-radius: 0.5rem;
  background: #223d5a;
  font-size: clamp(1rem, 5.2vw, 1.8rem);
}

.slider-tile.is-movable { border-color: #50bba4; color: #9effe3; }
.slider-gap { border: 1px dashed #374a63; border-radius: 0.5rem; }
.lights-tile { background: #162336; color: #b1c5dd; }
.lights-tile[aria-pressed="true"] { background: #62e8b8; color: #102a31; border-color: #a2ffe0; }

.solitaire-field {
  direction: ltr;
  display: grid;
  gap: 1rem;
  width: min(100%, 36rem);
}

.solitaire-top,
.solitaire-tableau {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  align-items: start;
  gap: clamp(0.18rem, 1vw, 0.55rem);
}

.solitaire-card {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 7;
  border-radius: clamp(0.25rem, 1.3vw, 0.62rem);
  border: 1px solid #9aaec8;
  background: #f4f8ff;
  color: #131c35;
  box-shadow: 0 3px 8px #050b1770;
  font-size: clamp(0.65rem, 2.7vw, 1.05rem);
}

.solitaire-pile .solitaire-card + .solitaire-card { margin-top: -92%; }
.solitaire-pile .solitaire-card.is-hidden + .solitaire-card { margin-top: -118%; }
.solitaire-card.is-red { color: #b32452; }
.solitaire-card.is-selected { background: #aafbe2; box-shadow: inset 0 0 0 2px #197960; }
.solitaire-card.is-hint { box-shadow: inset 0 0 0 2px #e9c45b; }
.puzzle-game .solitaire-card:focus-visible { outline-color: #0a8078; outline-offset: -3px; }
.puzzle-game .card-back:focus-visible,
.puzzle-game .card-placeholder:focus-visible { outline-color: var(--puzzle-accent); }

.card-corner {
  position: absolute;
  top: 2%;
  left: 5%;
  font-size: inherit;
  line-height: 1.1;
}

.card-suit {
  font-size: clamp(0.9rem, 4vw, 2rem);
}

.card-back {
  background: repeating-linear-gradient(135deg, #203a56 0 4px, #2c4c6b 4px 8px);
  color: #f1fbff;
  border: 1px solid #6f99bb;
}

.card-back.is-hidden {
  cursor: default;
}

.card-placeholder {
  background: #172438;
  color: #a9bcd4;
  border: 1px dashed #62809b;
  box-shadow: none;
}

@media (max-width: 420px) {
  .sudoku-pad {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .sudoku-pad .button {
    grid-column: auto;
    justify-self: stretch;
    padding-inline: 0.2rem;
    font-size: 0.72rem;
  }

  .merge-grid,
  .slider-grid,
  .lights-grid {
    padding: 0.28rem;
    gap: 0.28rem;
  }
}