body {
  font-family: 'Segoe UI', Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #f0f4f8, #d9e2ec);
}

.container {
  width: 550px;
  padding: 30px;
  background-color: white;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  text-align: center;
  transition: all 0.3s ease;
}

h1 {
  margin-bottom: 20px;
  font-size: 24px;
  color: #333;
}

.file-drop-area {
  padding: 30px;
  border: 2px dashed #a0aec0;
  background-color: #edf2f7;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.file-drop-area:hover {
  background-color: #e2e8f0;
}

.file-drop-area.dragging {
  background-color: #cbd5e0;
}

.file-drop-area span {
  display: block;
  margin-bottom: 10px;
  font-size: 16px;
  color: #4a5568;
}

input[type="file"] {
  display: none;
}

.preview-area {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
  justify-content: center;
}

.preview-area img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 10px;
  box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.preview-area img:hover {
  transform: scale(1.1);
}

.progress-area {
  width: 100%;
  height: 12px;
  background-color: #e2e8f0;
  border-radius: 10px;
  overflow: hidden;
  margin: 15px 0;
}

.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(to right, #4caf50, #81c784);
  transition: width 0.5s ease;
}

.button-area {
  display: flex;
  justify-content: space-between;
  margin-top: 15px;
}

button {
  padding: 12px 25px;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

button:hover:not(:disabled) {
  background-color: #45a049;
  transform: translateY(-2px);
}

button:disabled {
  background-color: #bbb;
}

button:active:not(:disabled) {
  transform: translateY(1px);
}