@import url('../global.css');

/* =============================================================================
   Sudoku — 9×9 grid (thick 3×3 box separators) above a 1–9 input pad.
   ========================================================================== */

:root {
  --title-color: var(--color-sudoku);
  --sudoku-line: #334155;
  --sudoku-thin: #cbd5e1;
  --sudoku-given: #1e293b;
  --sudoku-input: var(--color-sudoku);
  --sudoku-sel: color-mix(in srgb, var(--color-sudoku) 22%, white);
  --sudoku-peer: color-mix(in srgb, var(--color-sudoku) 8%, white);
  --sudoku-same: color-mix(in srgb, var(--color-sudoku) 16%, white);
}

.sudoku-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  width: 100%;
}

/* --- Grid ------------------------------------------------------------------ */

/* Fill the largest square that fits the card width AND the viewport height,
   leaving room for the HUD above and the input pad below — so it takes as much
   space as the other games (and grows in immersive/zen mode) instead of a fixed
   cap. */
.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  width: min(100%, calc(100dvh - 13rem));
  aspect-ratio: 1;
  border: 3px solid var(--sudoku-line);
  border-radius: var(--border-radius-sm);
  background: var(--white-color);
  overflow: hidden;
}

.sudoku-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
  border: 1px solid var(--sudoku-thin);
  background: var(--white-color);
  color: var(--sudoku-input);
  font-size: clamp(1rem, 4.5vmin, 1.7rem);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: background 0.1s;
}

/* Thick separators between the 3×3 boxes. */
.sudoku-cell:nth-child(9n + 3),
.sudoku-cell:nth-child(9n + 6) {
  border-right: 2px solid var(--sudoku-line);
}
.sudoku-cell:nth-child(n + 19):nth-child(-n + 27),
.sudoku-cell:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom: 2px solid var(--sudoku-line);
}

.sudoku-cell.is-given {
  color: var(--sudoku-given);
  cursor: default;
}

.sudoku-cell.is-peer {
  background: var(--sudoku-peer);
}
.sudoku-cell.is-same {
  background: var(--sudoku-same);
}
.sudoku-cell.is-selected {
  background: var(--sudoku-sel);
}
.sudoku-cell.is-conflict {
  color: var(--error-color);
  background: color-mix(in srgb, var(--error-color) 14%, white);
}

.sudoku-cell:focus-visible {
  outline: 2px solid var(--color-sudoku);
  outline-offset: -2px;
  z-index: 1;
}

/* --- Input pad ------------------------------------------------------------- */

.sudoku-pad {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-xs);
  width: min(92vw, 30rem);
}

.sudoku-pad-key {
  flex: 1 1 2rem;
  max-width: 3rem;
  height: 3rem;
  border: none;
  border-radius: var(--border-radius-sm);
  background: var(--white-color);
  box-shadow: var(--shadow-sm);
  color: var(--sudoku-given);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition:
    background 0.12s,
    transform 0.05s;
}

.sudoku-pad-key:hover {
  background: var(--sudoku-peer);
}
.sudoku-pad-key:active {
  transform: scale(0.94);
}
.sudoku-pad-key:focus-visible {
  outline: 2px solid var(--color-sudoku);
  outline-offset: 2px;
}

.sudoku-pad-erase {
  color: var(--error-color);
}