:root{
  --bg1:#fff7cc;
  --bg2:#d8f1ff;
  --cardBack1:#4facfe;
  --cardBack2:#00f2fe;
  --accent:#ffb703;
  --good:#38b000;
  --bad:#e63946;
  --text:#023047;
}

*{
  box-sizing:border-box;
  font-family:'Comic Sans MS','Baloo','Arial Rounded MT Bold',sans-serif;
}

body{
  margin:0;
  min-height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  background:linear-gradient(135deg,var(--bg1),var(--bg2));
  overscroll-behavior: none;
  touch-action: manipulation;
}

.game-wrap{
  width:100%;
  max-width:420px;
  padding:14px;
}

.header{
  background:#fff;
  border-radius:18px;
  padding:12px;
  box-shadow:0 6px 14px rgba(0,0,0,.15);
  text-align:center;
  margin-bottom:12px;
}

.header h1{
  margin:4px 0;
  font-size:1.4rem;
  color:var(--text);
}

.stats{
  display:flex;
  justify-content:space-around;
  margin-top:6px;
  font-size:.95rem;
}

.stats span{
  background:#eaf6ff;
  padding:6px 10px;
  border-radius:12px;
}

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

.card{
  aspect-ratio:1/1;
  perspective:900px;
}

.card-inner{
  width:100%;
  height:100%;
  position:relative;
  transform-style:preserve-3d;
  transition:transform .5s;
  cursor:pointer;
}

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

.card-face{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:16px;
  backface-visibility:hidden;
  box-shadow:0 6px 10px rgba(0,0,0,.2);
}

/* DEPAN (ICON) */
.card-front{
  background:#fff;
  transform:rotateY(180deg);
  font-size:2.2rem;
}

/* BELAKANG */
.card-back{
  background:
    linear-gradient(135deg,var(--cardBack1),var(--cardBack2));
  color:#fff;
  font-size:1.8rem;
  position:relative;
  overflow:hidden;
}

.card-back::after{
  content:"★";
  position:absolute;
  font-size:5rem;
  opacity:.15;
  transform:rotate(-25deg);
}

.card.matched .card-front{
  background:#d8ffd8;
  box-shadow:0 0 14px rgba(56,176,0,.8);
}

.footer{
  margin-top:12px;
  text-align:center;
}

button{
  background:linear-gradient(135deg,#ffd166,#ff9f1c);
  border:none;
  padding:10px 20px;
  border-radius:18px;
  font-size:1rem;
  font-weight:bold;
  cursor:pointer;
  box-shadow:0 4px 8px rgba(0,0,0,.25);
}

button:active{
  transform:scale(.95);
}