body {
  font-family: 'Open Sans', sans-serif;
  background-color: #f8f9fa;
}

.card {
  border-radius: 1rem;
  box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.1);
}

.card-header {
  background-color: #5dade2; /* Light Blue */
  color: #fff;
  border-radius: 1rem 1rem 0 0;
}

.btn-primary {
  background-color: #3498db; /* Primary Blue */
  border-color: #3498db;
  border-radius: 50px; /* Pill shape */
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.btn-primary:hover {
  background-color: #85c1e9;
  border-color: #85c1e9;
}

.spinner-border {
  width: 1rem;
  height: 1rem;
}

.error-message {
  color: red;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.file-input {
  padding: 1.5rem;
  border: 2px dashed #3498db;
  border-radius: 0.5rem;
  background-color: #ecf0f1;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.file-input.dragover {
  background-color: #d0e8ff;
}

.card-img-top {
  width: 512px;
  height: 512px;
  object-fit: contain;
  background-color: black;
  border: 1px solid #ddd;
  display: block;
  margin: auto;
}

@media (max-width: 768px) {
  .card-img-top {
    width: 100%;
    height: auto;
  }
}