@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap');

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

body {
  font-family: 'Montserrat', sans-serif;
  background: linear-gradient(135deg, #2b5876, #4e4376);
  color: #f0f0f0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  min-height: 100vh;
}

header {
  width: 100%;
  max-width: 800px;
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 3rem;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
}

.controls {
  margin: 10px 0;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.controls label,
.controls select,
.controls button {
  margin: 5px;
  padding: 10px 15px;
  font-size: 1rem;
  border: none;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  cursor: pointer;
  transition: background 0.3s, transform 0.3s;
}

.controls select:focus,
.controls button:focus,
.controls label:focus {
  outline: none;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.controls select:hover,
.controls button:hover,
.controls label:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.score-timer {
  margin-top: 15px;
  font-size: 1.5rem;
  display: flex;
  justify-content: space-around;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.game-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 20px;
  width: 100%;
  max-width: 800px;
  perspective: 1000px;
  padding: 10px;
}

.card {
  position: relative;
  width: 100%;
  cursor: pointer;
}

.card-inner {
  position: relative;
  width: 100%;
  padding-top: 100%;
  transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
  transform-style: preserve-3d;
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 15px;
  backface-visibility: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.6);
}

.card-front {
  background: linear-gradient(135deg, #ff9a9e, #fad0c4);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.card-back {
  background: linear-gradient(135deg, #a18cd1, #fbc2eb);
  transform: rotateY(180deg);
  box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.3);
}

@media (max-width: 600px) {
  header h1 {
    font-size: 2.5rem;
  }
  .controls label,
  .controls select,
  .controls button {
    font-size: 0.9rem;
    padding: 8px 12px;
  }
  .card-face {
    font-size: 2.5rem;
  }
}