body {
  margin: 0;
  font-family: sans-serif;
  padding: 20px;
  background-color: #f4f4f4;
}

.header {
  text-align: left;
  margin-bottom: 10px;
}

.back-button {
  text-decoration: none;
  color: #000;
  font-weight: bold;
  background: #ffffffaa;
  padding: 6px 12px;
  border-radius: 8px;
}

.controls {
  text-align: center;
  margin-bottom: 20px;
}

.filter {
  margin: 5px;
  padding: 8px 14px;
  border: none;
  background-color: #333;
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
}

.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.card {
  position: relative;
  width: 200px;
  height: 200px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  display: flex;
  justify-content: center;
  align-items: center;
}

.card img {
  width: 100%;
  height: 100%;
  object-fit: contain; /* レターボックス表示 */

}

.card-title {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 18px;
  font-weight: bold;
  text-align: center;
  text-shadow: 1px 1px 2px black, -1px -1px 2px black;
  pointer-events: none;
}