body {
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f0f0f0;
  margin: 0;
}

#cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 20px;
  transform: rotate(-15deg); /* бүтүндөй gridди аз диагональ бурч менен бурчтайт */
}

.card {
  width: 120px;
  height: 160px;
  perspective: 600px;
  cursor: pointer;
  transform: rotate(15deg); /* ар бир карточканы аз бурчтайт */
}

.card-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s;
}

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

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 20px;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: bold;
  transition: background 0.3s;
}

.card-front {
  color: #fff;
  transform: rotateY(180deg);
}

.card-back {
  background: #333;
  color: #fff;
}