body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.playlist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  padding: 20px;
}

/* PC端：每行最多显示12个项目 */
@media (min-width: 1024px) {
  .playlist {
    grid-template-columns: repeat(12, 1fr);
  }
}

/* 宽度在 768px 到 1023px：每行最多显示8个项目 */
@media (min-width: 768px) and (max-width: 1023px) {
  .playlist {
    grid-template-columns: repeat(8, 1fr);
  }
}

/* 宽度在 480px 到 768px：每行最多显示5个项目 */
@media (min-width: 480px) and (max-width: 768px) {
  .playlist {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* 宽度小于 480px：每行最多显示3个项目 */
@media (max-width: 480px) {
  .playlist {
    grid-template-columns: repeat(4, 1fr);
  }
}

.playlist-item {
  position: relative;
  padding: 20px;
  background-color: #f5f5f5;
  border: 1px solid #ddd;
  text-align: center;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s;
  box-sizing: border-box;
}

.playlist-item:hover {
  background-color: #ddd;
}

.playlist-item.locked {
  background-color: rgb(21, 31, 48);
  color: #fff;
  position: relative;
}

/* 锁定图标 */
.playlist-item.locked::after {
  content: '\1F512';
  position: absolute;
  top: 0;
  right: 0;
  font-size: 12px;
  font-weight: bold;
  color: #FFD700;
  background-color: #000;
  padding: 2px 6px;
  border-radius: 4px;
  text-align: center;
}

.playlist-item.hidden {
  display: none;
}

.expand-all {
  display: none;
  grid-column: span 2;
  text-align: center;
  padding: 10px;
  font-size: 16px;
  background-color: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 5px;
  cursor: pointer;
}

@media (max-width: 768px) {
  .expand-all {
    display: block;
  }
}