* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: url("assets/images/background.png") no-repeat center center fixed;
  background-size: cover;
  font-family: "Segoe UI", sans-serif;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  justify-content: center;
}

h1,
h2 {
  font-weight: bold;
  text-shadow: 2px 2px 4px #000;
}

#score {
  font-size: 28px;
  margin-bottom: 20px;
}

#start-button {
  padding: 12px 24px;
  font-size: 20px;
  margin-bottom: 20px;
  cursor: pointer;
  background-color: #444;
  border: none;
  border-radius: 8px;
  color: white;
}

#game-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  background: rgba(0, 0, 0, 0.5);
  padding: 12px;
  border-radius: 15px;
  width: 95vmin;
  height: 95vmin;
  max-width: 450px;
  max-height: 450px;
  touch-action: none;
}

.tile {
  width: 100%;
  aspect-ratio: 1/1;
  background-color: #2a2a2a;
  border-radius: 10px;
  background-size: cover;
  background-position: center;
  transition: transform 0.1s;
  border: 3px solid #666;
}