/* =====================================
[REF]
- HTML: #dropOverlay.drop-overlay
- JS: assets/app.js（ドラッグイベントで本体にクラス付与）
- STATE: body.is-file-dragging
- LAYER: z-index（--z-modal-overlay + 10）
- SPLIT: NEW
===================================== */

.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 10000; /* ローディングより前面、かつ最前面に近い位置 */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  pointer-events: none;
}

body.is-file-dragging .drop-overlay {
  opacity: 1;
  visibility: visible;
}

.drop-message {
  text-align: center;
  color: #fff;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

body.is-file-dragging .drop-message {
  transform: translateY(0);
}

.drop-icon {
  font-size: 4rem;
  display: block;
  margin-bottom: 1rem;
  animation: bounce 2s infinite;
}

.drop-text {
  font-size: 1.5rem;
  font-weight: 500;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
  40% {transform: translateY(-20px);}
  60% {transform: translateY(-10px);}
}