* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #f5f5f5;
  font-family: Arial, sans-serif;
}

.container {
  text-align: center;
  width: 90%;
  max-width: 600px;
}

h1 {
  margin-bottom: 20px;
  color: #333;
}

.upload-area {
  border: 2px dashed #aaa;
  padding: 40px;
  background-color: #fff;
  cursor: pointer;
  margin-bottom: 20px;
  transition: background-color 0.3s;
}

.upload-area.drag-over {
  background-color: #f0f8ff;
}

.upload-area p {
  color: #777;
}

button {
  padding: 10px 20px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}

button:disabled {
  background-color: #ddd;
  cursor: not-allowed;
}

.output {
  margin-top: 20px;
}

.file-output {
  margin-bottom: 20px;
  text-align: center;
}

.progress-bar {
  width: 100%;
  background-color: #ddd;
  height: 10px;
  margin: 10px 0;
  border-radius: 5px;
  overflow: hidden;
}

.progress-bar-inner {
  height: 100%;
  width: 0;
  background-color: #4CAF50;
  transition: width 0.3s;
}

.download-button, #download-all-button {
  padding: 8px 16px;
  background-color: #2196F3;
  color: white;
  text-decoration: none;
  border-radius: 4px;
  font-weight: bold;
  display: inline-block;
  margin-top: 10px;
}

.download-button:hover, #download-all-button:hover {
  background-color: #0b7dda;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
  margin: 10% auto;
  padding: 20px;
  width: 80%;
  max-width: 600px;
  text-align: center;
  background-color: #fff;
  border-radius: 8px;
}

#preview-image {
  max-width: 90%;
  max-height: 80vh;
  display: block;
  margin: 0 auto;
}

.close {
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 24px;
  font-weight: bold;
  color: #333;
  cursor: pointer;
}

#preview-image {
  max-width: 100%;
  max-height: 80vh;
  width: auto;
  height: auto;
  display: block;
  margin: 0 auto;
}

#zip-progress-bar {
  width: 100%;
  background-color: #ddd;
  border-radius: 5px;
  overflow: hidden;
  margin-top: 10px;
  display: none; /* Hidden by default, shown when zipping */
}

#zip-progress-bar-inner {
  height: 10px;
  background-color: #4caf50;
  width: 0%;
}