body {
  font-family: sans-serif;
  text-align: center;
  background: #f0f0f0;
  color: #000;
  transition: 0.3s;
  padding: 20px;
}

body.dark {
  background: #121212;
  color: #fff;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  gap: 10px;
  margin-top: 20px;
}

.col {
  width: 100px;
  height: 100px;
  background: white;
  border: 2px solid #333;
  font-size: 2em;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.col:active {
  transform: scale(0.9);
  background-color: #ddd;
}

body.dark .col {
  background: #333;
  border-color: #777;
}

body.dark .col:active {
  background-color: #444;
}

.controls {
  margin: 15px;
}

.controls button,
select {
  margin: 5px;
  padding: 10px;
  font-size: 14px;
  cursor: pointer;
}

.info {
  margin-top: 10px;
}

.scores span {
  margin: 0 10px;
}

.timer {
  margin-top: 10px;
  font-weight: bold;
  color: #d9534f;
}

.history {
  margin-top: 5px;
  font-size: 0.9em;
  color: #666;
}

body.dark .history {
  color: #aaa;
}

#diff-label {
  margin-left: 10px;
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: repeat(3, 80px);
  }

  .col {
    width: 80px;
    height: 80px;
    font-size: 1.5em;
  }

  .controls button,
  select {
    font-size: 12px;
    padding: 8px;
  }

  .info,
  .scores {
    font-size: 1em;
  }
}