/* Pentominoes — page-specific styles */

.lesson { text-align: center; margin-bottom: 0.9rem; }

.lesson-name {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 4.5vw, 1.5rem);
  color: var(--color-coral);
  margin-bottom: 0.25rem;
}

.lesson-hint { color: var(--color-text-muted); max-width: 48ch; margin: 0 auto; }

.board-wrap { display: flex; justify-content: center; overflow-x: auto; padding: 0.35rem; }

.pent-board {
  display: grid;
  grid-template-columns: repeat(var(--cols), var(--sq, clamp(1.6rem, 7.5vw, 2.5rem)));
  gap: 0;
  padding: 6px;
  border-radius: var(--radius-md);
  background: #ece3d3;
  box-shadow: inset 0 2px 10px rgba(120, 100, 70, 0.16);
  transition: box-shadow 0.3s;
}

.cell {
  width: var(--sq, clamp(1.6rem, 7.5vw, 2.5rem));
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  background: #f7f1e4;
  box-shadow: inset 0 0 0 1px #e0d6c2;
  cursor: pointer;
  /* A finger dragging a piece must not scroll the page instead. */
  touch-action: none;
}

.cell:focus-visible { outline: 3px solid #7a5cd6; outline-offset: -3px; z-index: 2; }

/* A placed piece is outlined only where it meets something else, so five
   squares read as one shape rather than as five tiles. */
.cell.is-filled { box-shadow: none; }
.cell.is-filled.edge-t { box-shadow: inset 0 3px 0 rgba(0, 0, 0, 0.28); }
.cell.is-filled.edge-b { box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.28); }
.cell.is-filled.edge-l { box-shadow: inset 3px 0 0 rgba(0, 0, 0, 0.28); }
.cell.is-filled.edge-r { box-shadow: inset -3px 0 0 rgba(0, 0, 0, 0.28); }
.cell.is-filled.edge-t.edge-l { box-shadow: inset 0 3px 0 rgba(0,0,0,.28), inset 3px 0 0 rgba(0,0,0,.28); }
.cell.is-filled.edge-t.edge-r { box-shadow: inset 0 3px 0 rgba(0,0,0,.28), inset -3px 0 0 rgba(0,0,0,.28); }
.cell.is-filled.edge-b.edge-l { box-shadow: inset 0 -3px 0 rgba(0,0,0,.28), inset 3px 0 0 rgba(0,0,0,.28); }
.cell.is-filled.edge-b.edge-r { box-shadow: inset 0 -3px 0 rgba(0,0,0,.28), inset -3px 0 0 rgba(0,0,0,.28); }

.cell.is-ghost { opacity: 0.45; }

/* The piece you have hold of. Drawn over the seams so it reads as one object
   lifted slightly off the board. */
.cell.is-chosen { position: relative; z-index: 1; filter: brightness(1.12) saturate(1.25); }
.cell.is-chosen.edge-t { box-shadow: inset 0 4px 0 #2f2a22; }
.cell.is-chosen.edge-b { box-shadow: inset 0 -4px 0 #2f2a22; }
.cell.is-chosen.edge-l { box-shadow: inset 4px 0 0 #2f2a22; }
.cell.is-chosen.edge-r { box-shadow: inset -4px 0 0 #2f2a22; }
.cell.is-chosen.edge-t.edge-l { box-shadow: inset 0 4px 0 #2f2a22, inset 4px 0 0 #2f2a22; }
.cell.is-chosen.edge-t.edge-r { box-shadow: inset 0 4px 0 #2f2a22, inset -4px 0 0 #2f2a22; }
.cell.is-chosen.edge-b.edge-l { box-shadow: inset 0 -4px 0 #2f2a22, inset 4px 0 0 #2f2a22; }
.cell.is-chosen.edge-b.edge-r { box-shadow: inset 0 -4px 0 #2f2a22, inset -4px 0 0 #2f2a22; }

.pent-board.is-done { box-shadow: 0 0 0 4px #7ad0a8, inset 0 2px 10px rgba(120, 100, 70, 0.16); }
.pent-board.is-stuck { animation: pent-shake 0.4s; }

@keyframes pent-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* The tray */
.tray {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin: 0.9rem 0 0.3rem;
}

.piece {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  min-width: 3.2rem;
  padding: 0.4rem 0.45rem 0.3rem;
  border: 2px solid #e8e2d8;
  border-radius: var(--radius-sm);
  background: var(--color-bg-alt);
  cursor: pointer;
  transition: transform 0.12s, border-color 0.15s;
}

.piece { touch-action: none; }
.piece:hover, .piece:focus-visible { transform: translateY(-2px); border-color: var(--color-coral); outline: none; }
.piece.is-picked { border-color: var(--color-coral); background: #fff; box-shadow: 0 3px 0 rgba(255, 107, 90, 0.35); }
.piece.is-used { opacity: 0.35; }

.piece-art {
  display: grid;
  grid-template-columns: repeat(var(--pw), 9px);
  grid-template-rows: repeat(var(--ph), 9px);
  gap: 1px;
}

.dot { width: 9px; height: 9px; border-radius: 2px; }
.dot.is-on { box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.22); }

.piece-letter {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.chip {
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  border: 2px solid #e8e2d8;
  background: var(--color-bg);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  cursor: pointer;
}

.chip:hover, .chip:focus-visible { border-color: var(--color-coral); outline: none; }
.chip.is-on { background: var(--color-coral); border-color: var(--color-coral); color: #fff; }
.chip.is-done { border-color: #bfe6d6; color: #2f9e78; }
.chip.is-done.is-on { color: #fff; }

/* The square size is worked out from the width of the box and set on the
   board itself, so the long puzzles fit across rather than running off. */

@media (prefers-reduced-motion: reduce) {
  .piece { transition: none; }
  .pent-board.is-stuck { animation: none; }
}