body {
  margin: 0;
  background: #0e0f14;
  color: #fff;
  font-family: system-ui, sans-serif;
}

.topbar {
  padding: 16px 20px;
  border-bottom: 1px solid #222;
}

.container {
  padding: 28px;
}

/* 파일 영역 */
.files {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 24px;
}

/* 파일 카드 */
.file {
  position: relative;
  background: #1a1c27;
  border-radius: 20px;
  padding: 44px 16px 24px;
  text-align: center;
  cursor: grab;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

/* 드래그 중 들림 효과 */
.file.dragging {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 18px 40px rgba(0,0,0,0.45);
  cursor: grabbing;
}

/* 폴더 탭 */
.folder-tab {
  position: absolute;
  top: 0;
  left: 20px;
  width: 52px;
  height: 14px;
  background: #2a2d45;
  border-radius: 0 0 8px 8px;
}

/* 아이콘 */
.file-icon {
  font-size: 40px;
  margin-bottom: 12px;
}

/* 파일명 */
.file-name {
  font-size: 14px;
  opacity: 0.9;
  word-break: keep-all;
}

/* 오버레이 */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.75);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.overlay.active {
  display: flex;
}

.overlay-box {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  background: #11131a;
  padding: 28px;
  border-radius: 22px;
  border: 1px solid #333;
}

/* 액션 카드 */
.action {
  padding: 22px;
  border-radius: 16px;
  border: 2px dashed #444;
  text-align: center;
  color: #ccc;
  cursor: pointer;
  transition: 0.2s;
}

.action:hover {
  border-color: #ffe066;
  background: rgba(255,224,102,0.1);
  color: #fff;
}