/* ============================================================
 * 文件：css/deck-back-btn.css
 * 作用：皇家书库（卡组配置）左上角返回按钮
 * 来源：从 index.html <style> 标签拆出
 * ============================================================ */
.deck-back-btn {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 56px;
  height: 42px;
  background: rgba(40, 30, 20, 0.92);
  border: 1.5px solid rgba(212, 168, 67, 0.65);
  border-radius: 8px;
  color: #d4a843;
  font-size: 22px;
  line-height: 42px;
  text-align: center;
  cursor: pointer;
  z-index: 300;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  user-select: none;
  -webkit-user-select: none;
}