/* ============================================================
   Quiet Pages Publishing — sudoku.css
   Sudoku of the Day — game styles
   Extends style.css (loaded first). Uses same design tokens.
   ============================================================ */

/* ── Page header ─────────────────────────────────────────── */

.sudoku-page-head {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--parchment-3);
}

.sudoku-page-head .container {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.sudoku-head-left {}

.sudoku-head-left h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  font-weight: 400;
  color: var(--slate);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0.35rem 0 0.6rem;
}

.sudoku-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.sudoku-date {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--slate-mid);
  letter-spacing: 0.04em;
}

.difficulty-badge {
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--parchment-3);
  color: var(--slate-light);
  background: var(--parchment-2);
}

.difficulty-badge[data-difficulty="easy"]   { border-color: var(--sage); color: var(--sage-dark); }
.difficulty-badge[data-difficulty="medium"] { border-color: var(--slate-light); color: var(--slate-mid); }
.difficulty-badge[data-difficulty="hard"]   { border-color: var(--slate-mid); color: var(--slate); }
.difficulty-badge[data-difficulty="expert"] { border-color: var(--slate); color: var(--slate); background: var(--parchment-3); }

.sudoku-head-right {
  text-align: right;
}

.sudoku-countdown {
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--slate-light);
}

.sudoku-countdown strong {
  font-weight: 500;
  color: var(--slate-mid);
}

.sudoku-timer {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
  color: var(--slate-mid);
  margin-top: 0.3rem;
}

/* ── Fallback warning ────────────────────────────────────── */

.sudoku-fallback-notice {
  background: var(--parchment-2);
  border: 1px solid var(--parchment-3);
  border-left: 2px solid var(--slate-light);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0 0;
  font-size: 0.78rem;
  color: var(--slate-mid);
  letter-spacing: 0.02em;
  display: none;
}

.sudoku-fallback-notice.visible { display: block; }

/* ── Game section ────────────────────────────────────────── */

.sudoku-game-section {
  padding: 3rem 0;
}

.sudoku-game-section .container {
  max-width: 600px;
}

/* ── Grid ────────────────────────────────────────────────── */

.sudoku-grid-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
  margin: 0 auto 2rem;
  user-select: none;
}

.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  border: 2px solid var(--slate);
  background: var(--slate);        /* gap color — shows as thick box lines */
  gap: 1px;
  aspect-ratio: 1;
}

/* Box borders — every 3rd cell right/bottom gets a thicker separator */
.sudoku-grid .cell {
  background: var(--parchment);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
  outline: none;
}

/* Thick box lines: right edge of columns 3 and 6 */
.sudoku-grid .cell[data-col="2"],
.sudoku-grid .cell[data-col="5"] {
  border-right: 2px solid var(--slate);
  margin-right: -1px;             /* compensate for gap */
}

/* Thick box lines: bottom edge of rows 3 and 6 */
.sudoku-grid .cell[data-row="2"],
.sudoku-grid .cell[data-row="5"] {
  border-bottom: 2px solid var(--slate);
  margin-bottom: -1px;
}

/* ── Cell states ─────────────────────────────────────────── */

/* Clue (given) cell */
.cell.clue {
  cursor: default;
  background: var(--parchment-2);
}

.cell.clue .cell-digit {
  font-weight: 500;
  color: var(--slate);
}

/* Selected cell */
.cell.selected {
  background: #e8e3d4 !important;
  z-index: 2;
}

/* Peer highlight (same row/col/box as selected) */
.cell.peer {
  background: #f0ece2;
}

/* Conflict */
.cell.conflict {
  background: #f5e8e6 !important;
}

.cell.conflict .cell-digit {
  color: #8b3a35;
}

/* Same digit highlight */
.cell.same-digit {
  background: #e5edd8;
}

/* ── Cell content ────────────────────────────────────────── */

.cell-digit {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 3.5vw, 1.45rem);
  font-weight: 400;
  color: var(--sage-dark);
  line-height: 1;
  pointer-events: none;
}

/* Notes grid inside a cell — 3×3 sub-grid of pencil marks */
.cell-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 90%;
  height: 90%;
  pointer-events: none;
}

.note-digit {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: clamp(0.38rem, 1.1vw, 0.55rem);
  color: var(--slate-light);
  line-height: 1;
  font-weight: 400;
}

.note-digit.active {
  color: var(--slate-mid);
  font-weight: 500;
}

/* ── Controls ────────────────────────────────────────────── */

.sudoku-controls {
  max-width: 480px;
  margin: 0 auto 2rem;
}

.sudoku-numpad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  margin-bottom: 1rem;
}

.numpad-btn {
  aspect-ratio: 1;
  background: var(--parchment-2);
  border: 1px solid var(--parchment-3);
  font-family: var(--font-serif);
  font-size: clamp(0.9rem, 2.5vw, 1.25rem);
  font-weight: 400;
  color: var(--slate);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.numpad-btn:hover {
  background: var(--parchment-3);
  border-color: var(--slate-light);
}

.numpad-btn:active {
  background: var(--slate);
  color: var(--parchment);
}

.sudoku-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.action-btn {
  font-family: var(--font-sans);
  font-size: 0.67rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--parchment-3);
  color: var(--slate-mid);
  padding: 0.6rem 1.1rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.action-btn:hover {
  background: var(--parchment-2);
  border-color: var(--slate-light);
  color: var(--slate);
}

.action-btn.active,
.action-btn[aria-pressed="true"] {
  background: var(--slate);
  border-color: var(--slate);
  color: var(--parchment);
}

/* Notes mode indicator dot */
.action-btn .mode-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.15s;
}

.action-btn[aria-pressed="true"] .mode-dot {
  opacity: 1;
}

/* ── Loading state ───────────────────────────────────────── */

.sudoku-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  gap: 1rem;
  color: var(--slate-light);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.loading-mark {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--parchment-3);
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; }
  50%       { opacity: 1; }
}

/* ── Error state ─────────────────────────────────────────── */

.sudoku-error {
  display: none;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--slate-mid);
}

.sudoku-error.visible { display: block; }

.sudoku-error p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 0.75rem;
}

/* ── Completion section ──────────────────────────────────── */

.sudoku-completion {
  display: none;
  padding: 3.5rem 0;
  border-top: 1px solid var(--parchment-3);
}

.sudoku-completion.visible {
  display: block;
  animation: fadeUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.completion-inner {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.completion-mark {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--sage);
  margin-bottom: 1.25rem;
  display: block;
}

.completion-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 400;
  color: var(--slate);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.completion-body {
  font-size: 0.9rem;
  color: var(--slate-mid);
  line-height: 1.75;
  margin-bottom: 0.35rem;
}

.completion-time {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--slate);
  font-style: italic;
  margin-bottom: 2rem;
}

.completion-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Solution overlay ────────────────────────────────────── */

.sudoku-solution-wrap {
  display: none;
  margin-top: 2.5rem;
}

.sudoku-solution-wrap.visible {
  display: block;
  animation: fadeUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.solution-label {
  text-align: center;
  margin-bottom: 1rem;
}

/* Solution grid reuses sudoku-grid but cells are read-only and smaller */
.solution-grid-wrap {
  max-width: 360px;
  margin: 0 auto;
}

.solution-grid-wrap .sudoku-grid {
  pointer-events: none;
}

.solution-grid-wrap .cell {
  cursor: default;
}

/* Highlight cells that were originally empty (player had to solve these) */
.solution-grid-wrap .cell.was-empty .cell-digit {
  color: var(--sage-dark);
}

/* ── Cross-promo strip ───────────────────────────────────── */

.sudoku-crosspromo {
  padding: 4rem 0 5rem;
  border-top: 1px solid var(--parchment-3);
}

.sudoku-crosspromo-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--parchment-3);
  border: 1px solid var(--parchment-3);
  margin-top: 2rem;
}

.sudoku-crosspromo-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 1.75rem;
  background: var(--parchment);
  transition: background 0.2s;
  text-decoration: none;
}

.sudoku-crosspromo-item:hover {
  background: var(--parchment-2);
}

.sudoku-crosspromo-text { flex: 1; }

.sudoku-crosspromo-label {
  display: block;
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--slate);
  margin-top: 0.25rem;
  font-weight: 400;
}

.sudoku-crosspromo-arrow {
  font-size: 1.1rem;
  color: var(--slate-light);
  transition: transform 0.2s, color 0.2s;
}

.sudoku-crosspromo-item:hover .sudoku-crosspromo-arrow {
  transform: translateX(4px);
  color: var(--sage);
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 600px) {
  .sudoku-page-head .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .sudoku-head-right {
    text-align: left;
  }

  .sudoku-numpad {
    gap: 4px;
  }

  .sudoku-crosspromo-links {
    grid-template-columns: 1fr;
  }

  .completion-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 400px) {
  .sudoku-game-section .container {
    padding-inline: 0.75rem;
  }
}