body {
  margin: 0;
  font-family: "Trebuchet MS", "Comic Sans MS", sans-serif;
  background: linear-gradient(180deg, #ffe5ec, #d8f3dc);
}
.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px;
  text-align: center;
}
.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  margin: 12px 0;
}
select {
  border-radius: 8px;
  padding: 6px;
}
.best {
  margin: 0;
  font-weight: 700;
}
.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(60px, 1fr));
  gap: 10px;
}
button {
  border: 0;
  border-radius: 12px;
  padding: 10px;
  font-weight: 700;
}
.tile {
  min-height: 70px;
  font-size: 1.6rem;
  background: #90e0ef;
}
.tile.done,
.tile.show {
  background: #95d5b2;
}
@media (max-width: 600px) {
  .grid { grid-template-columns: repeat(3, minmax(60px, 1fr)); }
}