* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  background: #ffffff;
  padding: 25px 30px;
  border-radius: 15px;
  width: 360px;
  text-align: center;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

h1 {
  margin-bottom: 15px;
  color: #333;
}

.stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 15px;
  font-size: 16px;
  font-weight: 600;
}

.game-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}

.card {
  height: 65px;
  background: #4f46e5;
  color: white;
  font-size: 28px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.card:hover {
  transform: scale(1.05);
}

.card.flipped {
  background: #22c55e;
}

.card.matched {
  background: #16a34a;
  cursor: default;
}

button {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  font-weight: bold;
  background: #ef4444;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background: #dc2626;
}