.image-upload-section {
  padding: 20px;
  background: #1e2329;
  border-radius: 8px;
  margin-bottom: 20px;
}

.image-upload-section h3 {
  color: #fff;
  margin-bottom: 15px;
  font-size: 16px;
  font-weight: 500;
}

.upload-area {
  border: 2px dashed #3d4354;
  border-radius: 8px;
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: #252932;
}

.upload-area:hover {
  border-color: #026fd3;
  background: #2a2f3a;
}

.upload-area.dragover {
  border-color: #026fd3;
  background: #2a2f3a;
}

.upload-icon {
  font-size: 48px;
  color: #3d4354;
  margin-bottom: 15px;
}

.upload-text p {
  color: #fff;
  margin: 0 0 5px 0;
  font-size: 14px;
}

.upload-text small {
  color: #8b949e;
  font-size: 12px;
}

.browse-link {
  color: #026fd3;
  cursor: pointer;
  text-decoration: underline;
}

.upload-preview {
  background: #252932;
  border-radius: 8px;
  padding: 15px;
  margin: 15px 0;
  display: flex;
  align-items: center;
  gap: 15px;
}

.upload-preview img {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: 4px;
}

.preview-info {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview-info span {
  color: #fff;
  font-size: 14px;
}

.remove-btn {
  background: #f14d5b;
  border: none;
  border-radius: 4px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #fff;
  font-size: 12px;
}

.remove-btn:hover {
  background: #d63447;
}

.upload-btn {
  width: 100%;
  background: #026fd3;
  border: none;
  border-radius: 6px;
  padding: 12px;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.3s ease;
}

.upload-btn:hover:not(:disabled) {
  background: #0056b3;
}

.upload-btn:disabled {
  background: #3d4354;
  cursor: not-allowed;
  opacity: 0.6;
}

.upload-alert {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
}

.upload-alert.success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
}

.upload-alert.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.upload-alert i {
  font-size: 16px;
}

.opacity-control {
  margin-top: 20px;
  padding: 15px;
  background: #252932;
  border-radius: 6px;
}

.opacity-label {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  display: block;
  margin-bottom: 10px;
}

.opacity-slider-container {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}

.opacity-slider {
  flex: 1;
  height: 4px;
  background: #3d4354;
  border-radius: 2px;
  outline: none;
  -webkit-appearance: none;
}

.opacity-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: #026fd3;
  border-radius: 50%;
  cursor: pointer;
}

.opacity-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: #026fd3;
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.opacity-value {
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  min-width: 40px;
}

.remove-bg-btn {
  width: 100%;
  background: #f14d5b;
  border: none;
  border-radius: 4px;
  padding: 8px;
  color: #fff;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.remove-bg-btn:hover {
  background: #d63447;
}

/* Ensure canvas is transparent when background image is present */
#chartContainer.has-background #chartCanvas {
  background-color: transparent !important;
}