/* Basic reset */
* { box-sizing: border-box; margin:0; padding:0; }
body { 
  font-family: Arial, sans-serif; 
  background:#fafafa; 
  display:flex; 
  flex-direction:column; 
  align-items:center;
  position: relative;
  overflow: hidden;
  height: 100vh;
}

.background {
  width: 100%;
  height: 100%;
  position: fixed;
  background-image: url('./background.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* Header */
header { 
  text-align:center; 
  margin:20px; 
  position: relative;
  z-index: 1;

  /* NEW: add a dark translucent overlay behind the text */
  background: rgba(0, 0, 0, 0.4);
  padding: 15px 30px;
  border-radius: 12px;
}

/* NEW: style the main heading */
header h1 {
  font-size: 2.5rem;
  color: #fff;
  text-shadow:
    0 0 8px rgba(255,255,255,0.8),   /* soft outer glow */
    0 0 12px rgba(255,255,255,0.6),
    2px 2px 4px rgba(0,0,0,0.7);     /* subtle inner shadow */
  margin: 0;
}

/* NEW: give the stats a slight glow as well */
header .stats span {
  color: #fff;
  text-shadow: 0 0 4px rgba(255,255,255,0.7);
}
.stats { 
  margin-top:8px; 
  font-size:0.9rem; 
}

/* Board */
.board {
  display: grid;
  gap: 12px;
  max-width: 800px;
  width: 100%;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
}

/* Card */
.card {
  perspective: 1000px;
  cursor: pointer;
}
.card-inner {
  position: relative;
  width: 100%;
  padding-top: 100%; /* square */
  transform-style: preserve-3d;
  transition: transform 0.6s;
}
.card.flipped .card-inner { transform: rotateY(180deg); }

.card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 8px;
  display:flex; 
  align-items:center; 
  justify-content:center;
}
.card-back {
  background:#2196F3;
}
.card-front {
  background:#fff;
  transform: rotateY(180deg);
  border: 2px solid #ddd;
}