.sudoku-h1 { font-size: 1.5rem; font-weight: 300; margin: 1rem 0; }
.sudoku-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1rem;
}
.sudoku-controls label { font-size: 0.85rem; display: flex; gap: 0.4rem; align-items: center; }
.sudoku-controls select, .sudoku-controls button {
  font-size: 0.85rem;
  padding: 0.3rem 0.6rem;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}
.sudoku-controls button:hover { background: var(--border); }
.sudoku-pencil-btn.active {
  background: var(--accent);
  color: var(--bg);
}

.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  background: var(--card);
  border: 2px solid var(--text);
  border-radius: 4px;
  user-select: none;
  font-family: -apple-system, system-ui, sans-serif;
}
.sudoku-cell {
  position: relative;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.9rem, 4vw, 1.4rem);
  font-weight: 400;
  cursor: pointer;
  outline: none;
}
.sudoku-cell:focus,
.sudoku-cell.active { background: var(--border); }
.sudoku-cell.same-number { background: rgba(180, 180, 180, 0.15); }
.sudoku-cell.peer { background: rgba(180, 180, 180, 0.08); }
.sudoku-cell.clue { font-weight: 600; }
.sudoku-cell.conflict { color: #c33; }
.sudoku-cell.complete { color: var(--text-faint); }

/* Thick borders between 3x3 boxes */
.sudoku-cell[data-col="2"], .sudoku-cell[data-col="5"] { border-right: 2px solid var(--text); }
.sudoku-cell[data-row="2"], .sudoku-cell[data-row="5"] { border-bottom: 2px solid var(--text); }

/* Pencil marks: 3x3 grid of tiny digits in a cell */
.sudoku-cell .pencil {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  font-size: clamp(0.5rem, 1.6vw, 0.6rem);
  font-weight: 400;
  color: var(--text-muted);
  pointer-events: none;
}
.sudoku-cell .pencil span {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sudoku-keypad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.4rem;
  max-width: 480px;
  margin: 1rem auto 0;
}
.sudoku-keypad button {
  font-size: 1.05rem;
  padding: 0.6rem 0;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}
.sudoku-keypad button:hover { background: var(--border); }
.sudoku-key-clear { font-size: 0.85rem !important; }

.sudoku-tip {
  font-size: 0.75rem !important;
  text-align: center;
  margin-top: 0.75rem;
}

/* Win banner */
.sudoku-win {
  text-align: center;
  padding: 1rem;
  margin: 1rem auto;
  max-width: 480px;
  background: var(--card);
  border: 1px solid var(--text);
  border-radius: 6px;
  font-size: 1.1rem;
}

/* Games list page */
.games-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.game-card {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
  align-items: flex-start;
}
.game-card:hover { background: var(--border); }
.game-card-coming { cursor: default; opacity: 0.6; }
.game-card-coming:hover { background: var(--card); }
.game-icon { font-size: 2rem; flex-shrink: 0; }
.game-meta h2 { font-size: 1.1rem; font-weight: 500; margin: 0; }
.game-meta p { font-size: 0.85rem; margin-top: 0.2rem; }
.game-meta code { font-family: monospace; background: var(--border); padding: 0 0.2rem; border-radius: 2px; }