* {
  box-sizing: border-box;
}

.page {
  min-height: 100vh;
  background: #e6f0ff;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "Segoe UI", Arial, sans-serif;
}

.game-container {
  background: white;
  padding: 25px;
  width: 360px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

h1 {
  margin-bottom: 15px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.card {
  background: #6366f1;
  color: white;
  font-size: 28px;
  height: 70px;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.card.flipped {
  background: #e5e7eb;
  color: #111;
  cursor: default;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 12px;
  background: #4f46e5;
  color: white;
  cursor: pointer;
}