body {
  font-family: sans-serif;
  text-align: center;
  padding: 1rem;
}
h1 {
  font-size: 1.5rem;
}
#dropzone {
  border: 2px dashed #007bff;
  padding: 1rem;
  margin-bottom: 1rem;
  background-color: #f9f9f9;
  cursor: pointer;
  transition: background-color 0.2s;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}
#dropzone.dragover {
  background-color: #e0f7ff;
  border-color: #0056b3;
}
#previewContainer {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}
.preview-item {
  border: 1px solid #ddd;
  padding: 1rem;
  border-radius: 8px;
  width: 100%;
  max-width: 300px;
  background: #fff;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}
.preview-item img {
  max-width: 100%;
  height: auto;
  margin-bottom: 0.5rem;
}
.download-link,
.download-all {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.6rem 1rem;
  background-color: #28a745;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.9rem;
}
.download-all {
  margin-top: 2rem;
  display: none;
}
#clearBtn {
  display: none;
  margin: 0.5rem auto 1rem;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  background-color: #dc3545;
  color: white;
  cursor: pointer;
}
@media (min-width: 600px) {
  #previewContainer {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }
}