/* The pads: 2×2, 3×2 or 3×3, each its own colour, glowing when lit. */
.pads {
  --cols: 2;
  --rows: 2;
  display: grid;
  grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  grid-template-rows: repeat(var(--rows), minmax(0, 1fr));
  gap: 12px;
  width: min(100%, 380px, max(220px, calc((100dvh - 330px) * var(--cols) / var(--rows))));
  aspect-ratio: var(--cols) / var(--rows);
  margin: 0 auto;
  user-select: none;
  -webkit-user-select: none;
}

.pad {
  --hue: 200;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 22%;
  background: hsl(var(--hue) 50% 40%);
  box-shadow: inset 0 -6px 0 rgba(0, 0, 0, 0.22);
  color: rgba(255, 255, 255, 0.55);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.08s ease, scale 0.08s ease, box-shadow 0.08s ease;
}
.pad.lit {
  background: hsl(var(--hue) 95% 64%);
  box-shadow: 0 0 28px hsl(var(--hue) 95% 60% / 0.7), inset 0 -3px 0 rgba(0, 0, 0, 0.12);
  scale: 1.04;
}
.pad.wrong { background: var(--error); box-shadow: 0 0 24px var(--error); }
.pads.watching .pad { cursor: default; }
.pads.done .pad { opacity: 0.55; cursor: default; }
.pad:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.pads.shake { animation: shake 0.35s ease; }
@keyframes shake {
  25% { translate: -6px 0; }
  75% { translate: 6px 0; }
}
@media (pointer: coarse) {
  .pad span { display: none; }
}