/* ================================
   ローディング中のオーバーレイ + スピナー
   ================================ */
.is-loading {
  position: relative;
  opacity: 0.4;
  pointer-events: none;
  min-height: 200px;
  transition: opacity 0.6s ease-out;
}

.is-loading::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #333;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  z-index: 1000;
  opacity: 1;
  pointer-events: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ================================
   フェードインアニメーション
   ================================ */
.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ================================
   フィルタボタンのdisabledスタイル
   ================================ */
.filter-btn {
  transition: opacity 0.6s ease-out;
}

.filter-btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}