* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border-radius: 24px;
  padding: 30px;
  max-width: 600px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
  text-align: center;
  color: #fff;
  font-size: 1.8rem;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}

.info {
  color: #ccc;
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 8px 16px;
  border-radius: 12px;
}

.info span {
  color: #fff;
  font-weight: bold;
}

button {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  border: none;
  padding: 10px 24px;
  border-radius: 12px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  font-weight: 600;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

button:active {
  transform: translateY(0);
}

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

.card {
  aspect-ratio: 1;
  background: linear-gradient(145deg, #2a2a5a, #1e1e4a);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
  border: 2px solid rgba(255, 255, 255, 0.08);
  user-select: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.card:hover {
  transform: scale(1.03);
  border-color: rgba(255, 255, 255, 0.2);
}

.card.flipped {
  background: linear-gradient(145deg, #3a3a7a, #2a2a6a);
  border-color: rgba(102, 126, 234, 0.5);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
  transform: scale(1.02);
}

.card.matched {
  background: linear-gradient(145deg, #1a6a3a, #0f4a2a);
  border-color: rgba(80, 200, 120, 0.5);
  box-shadow: 0 0 20px rgba(80, 200, 120, 0.3);
  cursor: default;
  transform: scale(0.95);
  opacity: 0.8;
}

.win-message {
  text-align: center;
  color: #fff;
  font-size: 1.2rem;
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  border: 1px solid rgba(80, 200, 120, 0.3);
}

.win-message.hidden {
  display: none;
}

@media (max-width: 480px) {
  .container {
    padding: 16px;
  }
  .grid {
    gap: 8px;
  }
  .card {
    font-size: 1.6rem;
  }
  h1 {
    font-size: 1.4rem;
  }
}