* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #111;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  margin: 0 0 8px;
}

.subtitle {
  margin: 0 0 16px;
  color: #444;
}

.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

button {
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
}

.board {
  display: grid;
  grid-template-columns: repeat(15, 48px);
  grid-template-rows: repeat(7, 48px);
  gap: 2px;
  background: #222;
  width: fit-content;
  border: 2px solid #222;
}

.cell {
  width: 48px;
  height: 48px;
  border: 1px solid rgba(0, 0, 0, 0.25);
  position: relative;
}

.color-green { background: #4caf50; }
.color-yellow { background: #ffeb3b; }
.color-blue { background: #2196f3; }
.color-red { background: #f44336; }
.color-orange { background: #ff9800; }

.star {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 24px;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
}